Ground Grain Research Articles

Applied Research Note: Effects of grinding and pelleting Kernza grain on subsequent particle size, flowability, and pellet durability index

Applied Research Note: Effects of grinding and pelleting Kernza grain on subsequent particle size, flowability, and pellet durability index

Characteristics of the spring common wheat variety ‘Balkysh’

One of the recent breeding work results of the FRC KazRC of RAS was the spring common wheat variety ‘Balkysh’, which was included in the State List of Breeding Achievements approved for use in the Middle Volga region in 2021. The purpose of the current study was to characterize the variety under the conditions of the last years of testing in comparison with other varieties. The study was carried out in the fields with gray forest soils of the Tatar RIA, located in the suburbs of Kazan, in 2019–2023. The variety ‘Balkysh’ is not inferior or superior in productivity and protein yield to the varieties most common in the Republic of Tatarstan; the mean productivity of the variety was 4.31 t/ha, protein yield was 0.54 t/ha. The variety is characterized with high productivity stability. The variety had 25 % of gluten in grain, 13.2 % of protein, 94 units of IDK. The peculiarity of the rheological dough properties of the variety ‘Balkysh’ was a low value of flour force with 109 u.a., 61 mm of dough elasticity, 121 u.ph. of dough dilution, which can be used to form grinding grain batches balanced in quality to reduce the load on dough mixing machines. The variety ‘Balkysh’ is characterized with high field complex resistance to major leaf and stem diseases, with not more than 5 % of damage caused with brown leaf and stem rust over the years of testing; powdery mildew resistance during epiphytoty years was not lower than 6 points (a lower one third of the plant was slightly affected). The variety ‘Balkysh’ is characterized as short-stemmed; the mean plant height was 65.7 cm, which is significantly lower than that of the varieties developed by the TatRIA.

Ruminal degradation of maize starch is affected by sowing date

Context Delaying sowing date of maize allows producers to achieve stabilised yield. Delays in the sowing date generate changes in the grain structure, which may affect the ruminal degradability of the maize starch. Aims The objective of this study was to evaluate the effects of maize sowing date on ruminal starch degradability, and how it is related with grain physical characteristics and source:sink ratio during the grain-filling period. Methods To study the effects of maize sowing date on grain physical characteristics and on starch in situ effective degradability (ED; 6%/h passage rate from the rumen), eight treatments were defined on the basis of eight different sowing dates in Argentina of a commercial semi-dentate maize hybrid (Dekalb 7210 VT3P), as follows: Treatment 1 (13 October), Treatments 2, 3, and 4 (4, 17 and 26 November respectively), Treatments 5, 6 and 7 (3, 15 and 28 December, respectively) and Treatment 8 (5 January). For each sowing date, three plots of maize were sown in a complete randomised-block design and harvested at grain physiological maturity. Key results Starch ED of ground (2.0-mm) grains ranged from 631 to 801 g/kg and showed a ‘J’-shape response, being lower for the sowing dates from 17 November to 3 December and highest on the sowing date of 5 January. Grain density increased until the sowing date of 17 November, and then decreased. Grain vitreousness and hardness were initially not affected, but started to decline after the sowing date of 17 November. Grain test weight was not affected until the sowing date of 15 December, when it started to decline. The source:sink ratio during the grain-filling period decreased as the sowing date was delayed. Effective starch degradability was negatively correlated with the physical characteristics evaluated and the source:sink ratio. Conclusions Delaying sowing date affected the maize source:sink ratio during the grain-filling period; this was associated with changes in grain physical characteristics and with an increase in ruminal starch degradability. Implications Delaying sowing date increases dry matter (DM) and starch effective degradability, and therefore could affect cattle weight gain and feed conversion efficiency.

Feeding sorghum dry distillers grains plus solubles to early-weaned beef calves

This study evaluated the effect of feeding sorghum dry distillers grains plus solubles (SDDGS) to early-weaned beef calves as an energy/protein source in a sorghum-grain-based diet. Twenty-four castrated Hereford calves (84.6 ± 11.0 kg) were assigned randomly to four rations differing in SDDGS concentrations (0, 130, 260, or 390 g/kg, dry matter [DM] basis), where the SDDGS replaced a mixture of sorghum ground grain (420 g/kg) and soybean meal (580 g/kg) at a balance that ensured a similar supply of crude protein (185 g/kg) and metabolizable energy (12.1 MJ/kg) in the ration. The feeding period lasted for 70 days, with animals individually fed ad libitum in three daily meals. Increasing SDDGS in the diet linearly increased DM intake, fiber and fat intake (P<0.01), without affecting nitrogen intake or DM digestibility (P>0.10). Higher SDDGS did not affect (P>0.10) calves’ BW gain (1.13 kg/d, SE 0.05) or final BW (160.0 kg, SE 8.8), but it did result in a linear drop in gain-to-feed ratio (GF= −0.0012 × + 0.2679; P<0.01). No differences were detected in animal behavior (eating, resting, or ruminating activity) due to treatments (P>0.10). The observed net energy (NE) in the control diet was below the expected value based on feeding standards; as SDDGS replaced a higher proportion of sorghum grain and soybean meal in the control diet, the observed diet NE concentration declined linearly (P<0.01). The highest replacement rate represented a reduction of 15% and 20% in diet NE for maintenance and BW gain, respectively.

Determination of grinding condition by grain elasticity and hammer width for sustainable feed production in livestock farming

Livestock farming is one of the important sectors of Uzbekistan that provides food. An integral part of livestock farming is feed production. Grinding grain is a very important stage in the preparation of complete feed. The study aims to justify the hammer’s width and theoretically investigate the parameters for grinding grain. Technical mechanics fundamentals were used in theoretical investigations. There is a schematic showing how the grain is ground in the grinding chamber. Theoretical studies indicate that for grain crushing, the internal loading resulting from grain particle compression should exceed the grain loading strength limit. According to the analytical relationship analysis to determine the width of the crusher, the width of the crusher depends on the strength limit and modulus of elasticity of the grains, the radius of rotation of the crusher, the number of blows and the diameter of the hole of the grinding chamber. In order to ensure that the grains are crushed at the required level, the width of the crusher hammer is greater than 1 cm, the radius of rotation is 21.5 cm, the number of blows is 25 times, the diameter of the hole of the grinding chamber is equal to or less than 0.0019 m.

Study on the effect of grain moisture on grinding efficiency

The quality of feed produced for cattle is one of the main factors influencing the efficiency of its keeping. The quality of the resulting feed depends to a large extent on the design features of the equipment, especially the mill. The purpose of this work is to analyze the system of grain grinding equipment and evaluate the efficiency of the developed grain grinding equipment in comparison with existing flour milling machines. A theoretical model of grinding grain material and its mathematical analysis of modeling are made, the influence of moisture on grinding, the influence on the size coefficient of the milled material is discussed. A comparative analysis of the grinding results of various researchers is analyzed. Options for grain grinding are discussed, based on the technological scheme for the production of grain and vegetable extrudate, by the method of "cold" extrusion of crushed grain and green plant mass (together). The considered variants of studies of the effect of moisture on grain grinding made it possible to draw appropriate conclusions.

ТЕХНОЛОГИЯ ПРОИЗВОДСТВА КРОЛИЧЬЕГО ПУХА ПРИ РАЗЛИЧНЫХ СИСТЕМАХ СОДЕРЖАНИЯ КРОЛИКОВ

The Angora rabbit, in depending on its keeping conditions gives about 1 kg of fluff per year. The fluff yield per 1 kg of body weight is in several times higher than sheep’s one. The Angora breed is fed according to almost the same standards as ordinary meat skinned rabbits: granular compound feeds, hay, juicy feeds. For rabbits, it is necessary proteins, fats, carbohydrates, fiber, vitamins, minerals in rations taking into account their digestibility normalizing. In order the fluff of rabbits to be clean, they should be fed with granular feed consisting mainly of cereals ground grains with lesser extent legumes, that are replaced with grass meal about 20% in the ration (the most expensive component), other types of feed, including 0,5% table salt and 1% of vitamin and mineral premix. The granulated feed should contain 86-90% of dry matter, 12-18% of crude protein, 12-16% of crude fiber, about 3% of fat. It is important in order to getting avoid wool wet and soiling during feeding and watering. The Angora breed includes rabbits with long fluffy hair. The data on awn and fluff ratio confirming in the other studies are presented. The wool quantity and quality obtaining from Angora rabbits is largely depending on feeding level and the nutrients’ degree that animals needs with the balanced ration’s correct ratio are met. Feed costs per unit of Angora rabbits’ pure wool fiber are in 3 times lower than sheep’s one, and in 38% lower than Angora goats: per 1 kg of Rambouillet sheep’s pure wool spend 2,520 MJ of digestible energy. The hair cover’s qualitative indicators such as shine, splendor, elasticity, balance and hair’s strength are indicated.

Effect of radial ultrasonic vibrations on wear properties of CBN grains in high-speed grinding of PTMCs

Effect of radial ultrasonic vibrations on wear properties of CBN grains in high-speed grinding of PTMCs

Multi-dimensional ultrasonic-assisted belt grinding on the surface integrity of Inconel 718

In order to meet the requirements of the isotropic high-performance machining of complex surfaces, this paper proposed three-dimensional ultrasonic assisted belt grinding (3D-UABG) method that integrates the advantages of surface strengthening and isotropic machining, analyzed the motion characteristics and surface formation laws. Then, the influence of ultrasonic vibrations on the surface integrity of Inconel 718 was studied by a self-designed 3D-UABG device. Finally, the surface formation mechanism was revealed combined with the surface integrity and abrasive grain motion characteristic. Results showed that compared with conventional abrasive belt grinding (CABG), the abrasive grain in normal-ultrasonic assisted belt grinding (N-UABG) reduced the height of texture peak formed an intermittent texture, which makes it have smallest surface roughness. At the same time, the high-frequency impact of abrasive grains not only increased the surface plastic deformation, but also realized the impact strengthening. Planar two-dimensional ultrasonic assisted belt grinding (2D-UABG) reduced the directionality difference of surface quality. However, the deflection characteristics of abrasive grains make it have a large surface roughness. The 3D-UABG surface has good comprehensive mechanical properties. The abrasive grains have three-dimensional dynamic characteristics in space, which effectively inhibit anisotropic stress state, promote uniform deformation, and helpful to obtain approximately isotropic surface texture and small surface roughness. On the one hand, the in-plane motion characteristics of planar two-dimensional ultrasonic vibration gave grinding surface more uniform surface integrity. On the other hand, the spatial motion trajectory of abrasive grains driven by three-dimensional ultrasonic vibration made it have a slow increased cutting depth, which avoided the tear damage caused by materials plastic accumulation and the large roughness caused by abrasive deflection under large cutting depth. In 3D-UABG, lower feed speed and amplitude and linear velocity matched to grinding parameters contribute to the improved surface integrity. This study has guiding significance for the development and engineering application of ultrasonic-assisted belt grinding technology.

Influence of wheat and amaranth grain mixture ratio on chemical and physicochemical parameters of wheat-amaranth flour

A new source of vegetable raw materials for the food industry has appeared on the Russian market - amaranth grain and products of its processing, which have a valuable chemical composition, high nutritional and biological value, containing a wide range of physiologically functional nutrients. The studies on the effect of different ratios of the grinding mixture of wheat and amaranth grains on the chemical and physico-chemical properties of wheat-amaranth flour as a result of their joint processing are presented. The object of the study was the grain of winter wheat of the variety Nemchinovskaya 85 and the grain of amaranth of the variety Voronezhsky. Processing of the control sample of common wheat and milling wheat-amaranth mixtures of various ratios was carried out in the laboratory grinding mills (LGM-4) with threaded (for break systems) and smooth microroughened rollers (for grinding systems). It has been found that in the control sample of wheat flour, the weighted average content of fat and protein was 1.12% and 11.57%, respectively, with the addition of 5% amaranth to the grinding wheat-amaranth grain mixture, the weighted average fat content in wheat-amaranth flour was 2.47 %, and the protein content - 12.55%, with the addition of 10% amaranth to the grinding wheat-amaranth grain mixture, the weighted average fat content of wheat-amaranth flour was 3.13%, and the protein content - 12.66%, with the addition of 15% amaranth in the milled wheat-amaranth grain mixture, the weighted average fat content in wheat-amaranth flour was 3.88%, and the protein content was 13.34%, with the addition of 20% amaranth to the milled wheat-amaranth grain mixture, the weighted average fat content in wheat-amaranth flour was 4.29%, and the protein content was 13.78%, respectively. It has been found that the addition of amaranth grain to the milled wheat-amaranth mixture up to 20% of amaranth grain significantly increases the yield of wheat-amaranth flour. It has been established that the addition of amaranth grain to the grinding grain mixture makes it possible to increase the fat content in wheat-amaranth flour by 282.1% and the protein content by 18.4% compared to the control wheat flour.

The balance of power consumption of the process of grain grinding

The purpose of the research is to determine the power consumption of the process of grain grinding with a grinder. When conducting theoretical studies to determine the amount of energy spent on grinding grain during the operation of the grinder, the physical and mechanical properties of the grain, the parameters and mode of operation of the grinder, the energy consumption to overcome harmful resistances, to grind grain and to discard the crushed mass were taken into account. The technological scheme of the grain grinder is given. A mathematical dependence is proposed to determine the power consumption of the grain grinding process by a grinder. It has been established that the power consumption of a hammer grinder is mainly influenced by the number of hammers, the angular velocity of the hammer, the area of the front part of the hammer, the radius of the grinding chamber, and the physical and mechanical properties of the grain. As a result of the research, graphical dependences of power consumption and productivity on the number of revolutions of the hammer propeller were built.

Analysis of crystal structure transition of polycrystalline 3C-SiC in nanocrystalline grinding based on molecular dynamics simulation

In order to study the grain/grain boundary crossing mechanism of polycrystalline 3C-SiC materials under nano-grinding, molecular dynamics(MD) method was used to simulate the grinding process of polycrystalline 3C-SiC materials under diamond abrasive particles. Through the coupling method of Voronoi construction of polycrystalline 3C-SiC workpiece model and MD construction process, the nano-grinding process of polycrystalline 3C-SiC material was established, the potential function field parameters were optimized, and the residual stress in polycrystalline 3C-SiC was eliminated. The energy transition equation is modified to reduce the time for the system to enter dynamic equilibrium. The crystal structure and dislocation generation of polycrystalline 3C-SiC were analyzed by post-processing methods such as defect analysis and crystal structure recognition. The results found that: there are cubic lattice, simple cubic lattice, hexagonal lattice and graphene mechanism type atoms at the grain boundary. During the machining process, the cubic lattice type atoms are converted to other types atoms, and other types structure atoms are converted to each other. The internal structure atoms of grains are converted to the grain boundary structure atoms during the machining process, and the crystal atoms near the grain boundary have low structural stability. The grinding force mainly acts on the forward direction and just below the grinding grain, and also has a small amount of distribution at the grain boundary, but it is relatively weak. The dislocation caused by grinding mainly occurs at grain boundaries. The resulting debris was monolithic, and a few were granular. The interconversion between grains and different structural atoms at the grain boundary is mainly from the crystal lattice atoms in grains to other atoms at the grain boundary. The force is transferred to the grain through the grain boundary, which hinders the transboundary transfer of force and protects the grains. The shearing force plays a dominant role in the grinding process.

Study on the grinding force of single grain in rail grinding based on open-type belt grinding

In the realm of machining, there exists a heightened demand for improved surface integrity of workpieces. Abrasive belt grinding presents several advantages, including a high grinding ratio, superior surface finish quality, and lower grinding temperature. Additionally, the precision placement of abrasive grains in the form of triangular pyramids further enhances the efficacy of this method. It has played an important role in the field of precision machining. Accurately predicting its grinding force is vital for improving its processing quality. In this study, an open-type belt grinding method was developed, the grinding force of triangular pyramid-shaped abrasive grains in rail grinding was analyzed and calculated using oblique cutting theory, the accuracy of the proposed model was verified experimentally, and the effects of abrasive rotation angle, wear height, cutting depth, grinding speed, and rake angle on the grinding force were analyzed, and the relevant laws were obtained. According to the findings, the grinding force displays an initial rise followed by a decline as the triangular pyramid abrasive particles' rotational angle increases. The grinding force demonstrates a linear growth in tandem with an increase in grinding depth. Furthermore, the grinding force rises proportionally with an increase in abrasive wear height. The proposed model can be used for the prediction and calculation of grinding forces of other shape abrasive grains as well.

Conical Grinding Wheel Ultrasonic-Assisted Grinding Micro-Texture Surface Formation Mechanism

The rotating ultrasonic-assisted grinding (RUAG) experiment of the conical grinding wheel generated the intermittent pit-shaped micro-texture on the surface of the workpiece, reducing thermal damage and improving the lubrication characteristics compared with conventional grinding (CG). To further optimize the surface properties, this paper studied the formation mechanism of micro-texture. This study used as basis the theory that micro-debris volume equals the macroscopic material removal one to establish the mathematical equation of grinding depth. Thereafter, formulas of micro-texture feature parameters, including pit length, pit depth, and texture spacing were deduced. The solved microscopic grinding depth was alternatingly positive and negative, indicating that the alternating separation between the grinding grain and workpiece caused intermittent pits in the grinding. Through response surface analysis (RSA), this paper analyzed the relationships among macroscopic grinding depth, micro-texture feature parameters, and machining parameters (i.e., amplitude, feed rate, and rotational speed). Single-factor experiments of machining parameters, with finite element simulation and experiment methods, were performed to verify the theoretical micro-texture features. The simulated program formed three-dimensional surfaces with micro-textures. Their measurement results were consistent with the theoretical ones. Experimental results proved that the range of pit length covers the theoretical ones, further verifying the accuracy of the grinding depth model. For this grinding wheel, the 8–10 μm amplitude was optimal for better roughness, lubrication, and thermal damage. Roughness was improved when increasing the rotational speed or reducing the feed rate based on the experiment. If the rotational speed and feed rate exceed the limiting values, then continuous grinding will break down the abrasive grains and even damage the cubic boron nitride (CBN) coating. Experimental results likewise showed that the pit shape was closely related to the surface properties, which deserves further investigation.

Establishment of Mathematical Model of Different Burr Removal Methods for Automobile Valve Body Parts

In the process of auto body parts processing, machining surface at the junction will produce burrs or flares. The existence of burr will have a bad effect on the machining accuracy, assembly accuracy and appearance quality of parts. In industrial production, the cost of removing these burrs is enormous. In automotive parts, the cost of deburring body parts can account for machining costs15% - 20%. Industry practice has shown that the actual cost of deburring systems increases as the complexity and accuracy of parts increase. Precision parts such as automobile valve body require high precision, and burr is usually removed by grinding. In grinding process, different types of burr will adopt different grinding process to purify, frequent adjustment process will affect the production efficiency, so the combination with the characteristics of grinding, the grinding grain edge radius, equivalent negative rake Angle and other factors into consideration, burr types can be divided into three categories, respectively on the three types of burr mathematical modeling, The removal mechanism of different kinds of burr is explained theoretically, which lays a theoretical foundation for improving efficiency in production practice.

ZAWARTOŚĆ POLIFENOLI I KOFEINY W FUSACH UZYSKANYCH PRZY UŻYCIU RÓŻNYCH DOMOWYCH METOD PARZENIA KAWY

Background. Grounds generated during coffee brewing as waste produced in the world in millions of tons per year seem to be an interesting source of bioactive substances for further use. The aim of the study was to evaluate the content of bioactive components in coffee grounds obtained from coffee brewing using popular methods. Coffee grounds obtained as a result of brewing Arabica coffee using five methods: pouring, drip, crucible, coffee maker and espresso machine were tested. The content of phenolic acids and total phenols, as well as antioxidant activity (by means of DPPH• and FRAP methods) and caffeine (for the first time by means of high-performance thin layer chromatography (HPTLC) technique) were assessed. Results and conclusion. A coffee brewing method significantly affects the residue of bioactive compounds in grounds. The results obtained allow to conclude that the methods in which the contact of a ground grain with water is short, and a grain is coarsely ground, leave the most polyphenols and caffeine in coffee grounds. Such techniques were those using a drip and espresso machine (total phenolic content up to 12.29 and 14.88 mg gallic acid equivalents/g, respectively) and pouring in the case of caffeine (21 mg/g). In turn, coffee grounds obtained from brewing coffee in a crucible, in which most of the determined substances were extracted into the infusion, had the least bioactive compounds. Out of all the extraction systems being evaluated, aqueous ethanol (50 %) was indicated as the most effective one. The use of spent coffee grounds as a source of bioactive substances may be a valuable way to valorize large amounts of gastronomic waste.

Titanium alloys surface integrity of belt grinding considering different machining trajectory direction

The interplay of abrasive grains and materials complicates the grinding of titanium alloys by abrasive belts. Notably, the influence relationship of surface generation for complex curved workpieces such as hollow blades needs to be clarified, making precise control of the surface integrity of complex surfaces difficult in abrasive belt grinding applications. This paper thus proposes a trajectory planning method based on the direction of interaction between grinding grains and materials to reveal its influence law on the surface integrity of complex curved surfaces of titanium alloy with unevenly distributed machining allowances. First, a machining trajectory with different angles between the grinding direction and feed direction is proposed. In order to determine the corresponding experimental scheme for titanium alloy hollow blades. Experimental results are used to analyze the influence of different grinding trajectory directions on the surface roughness, residual stress, surface topography, and accuracy of the contours. The results show that different grinding trajectory directions significantly affect the workpiece’s surface integrity. By varying the grinding trajectory direction, it is possible to reduce the surface roughness of titanium alloy workpieces by approximately 40%, increase the surface residual compressive stress by approximately 50%, provide a finer workpiece surface and improve the consistency of the surface texture. This work is expected to guide the efficient and high-quality machining of complex curved parts such as titanium alloy hollow blades.

Molecular dynamics study on grinding mechanism of polycrystalline silicon carbide

In this paper, stress, temperature, dislocation, surface morphology and crystal structure of polycrystalline silicon carbide under different grinding speeds and grain sizes are studied by molecular dynamics simulation. Influence of silicon carbide with different grain sizes on formation and emission of dislocations and relationship between formation and emission of dislocations under different grinding speeds are revealed. By comparing number of amorphous atoms and generation of dislocations between monocrystalline silicon carbide and polycrystalline silicon carbide at different grinding speeds, it is observed that thickness of subsurface damage layer of monocrystalline silicon carbide correspondingly increases with grinding speed. In contrast, damage layer of polycrystalline silicon carbide is determined by the joint action of grain size and grinding speed, and it does not decrease with increase in grinding speed, unlike monocrystalline silicon carbide. Accumulation of dislocations at the grain boundary causes strengthening between the grain boundaries, and alters the cutting force. In the grinding process, although grinding speed is not the primary factor affecting surface topography, it is the main factor affecting workpiece temperature.

In Remembrance of Saints: The Rise and Fall of an Inner Asian Sufi Dynasty By Muḥammad Ṣadiq Kashgari, translated by David Brophy

David Brophy’s translation of this classic East Turkistani hagiography is an extraordinary achievement and a model of the translator’s art. His challenging Chaghatay source text, by Kashgari, is without a doubt the ‘most popular and widely circulating’ (p. xiii) narrative about the Muslim dynasty that ruled a large portion of what is now Xinjiang on the eve of the Chinese conquests. Kashgari was himself a Chinese-allied Muslim elite, and yet he ‘glorifies resistance to non-Muslim rule’ (p. xiv) and, like an eighteenth-century drill rapper, relentlessly calls out China’s Muslim allies as snitches and traitors. While the tale has many diversions and tipsy versified odes to the cupbearer (saqinamas), the heart of it is the dynasty’s struggle against the Chinese and their reviled running-dogs among the non-Muslim Qalmaqs (Kalmyks) as well as among the Muslim Kyrgyz. The typical conflict in Central Asian hagiography is exclusively between Muslims and non-Muslims, so it is notable to find so many Muslim adversaries fighting the heroes here. Indeed, some of the dynasty’s own amirs object to the idea of Muslims fighting Muslims: ‘we are Muslims and our king is a Muslim, and the shariʿa commands that it’s impermissible for Muslims to wage war on Muslims’ (p. 164). A pre-battle fatwā settles the matter: ‘[S]omeone who lends support to the infidels to strengthen their army and increase it therefore belongs to the army of the infidel, i.e. they are an infidel’ (p. 187). Lest the reader think the dynasty goes easy on ‘erstwhile’ co-religionists, the descriptions of warfare are sometimes wildly graphic. One dynast ‘slaughtered a thousand fanatics like sheep and ground grain in a mill driven by their blood’ (p. 43).

ЗАВИСИМОСТЬ ЧАСТОТЫ ВРАЩЕНИЯ ЛОПАСТЕЙ МЕШАЛКИ МОКРОГО ПЫЛЕУЛОВИТЕЛЯ ОТ ПЛОТНОСТИ ЖИДКОСТИ

One of the undesirable factors when grinding grain with hammer crushers is the formation of flour dust, which is fire and explosive, as well as harmful to the health of service personnel. The applied fabric dust collectors ineffectively purify the air coming out of the pneumatic system of the crusher. One of the directions of development of dust collection equipment is the development of wet dust collectors or the improvement of existing ones. The proposed two-stage wet dust collector gives greater efficiency of air purification from dust, which is shown by laboratory studies. One of the factors affecting the quality of cleaning is the speed of rotation of the agitator blade, which varies depending on the concentration of dust in the liquid of the first stage. Not the entire dust-air mixture passes through the upgraded dust collector, but only the part that is redundant. This allows you to increase the life of the dust collector before the next service. The aim of the work is to study the dependence of the rotation speed of the blade of the agitator of the first stage of the dust collector on the density of the liquid. Methods of mathematical modeling of the agitator operation, approximation and regression analysis were used for the research, correlation analysis was performed. Theoretical studies have revealed a hyperbolic dependence of the rotation frequency of the paddle agitator on the density of the colloidal solution, however, experimental data provided other quantitative indicators. To determine the necessary parameters of the equation, the least squares method was used to approximate the experimental data. The calculated data obtained were compared with the experimental ones by the coefficient of determination, and the model was highly adequate, R2 = 0,9705. The presented method of selecting the regression equation shows good convergence with the experiment. The equations derived for a laboratory installation can be converted to an industrial design using the theory of similarity.