White Soot Research Articles

INVESTIGATION OF RARE AND RARE-EARTH ELEMENTS LEACHING PROCESSES FROM THE WEATHERING CRUST ORES OF THE KUNDYBAY DEPOSIT

The weathering crust ore of the Kundybay deposit is a hard-enriched ore that contains such minerals as cherchite, bastnesite, kaolinite, etc., which are embedded in the matrix structure of other silicate rocks. These minerals contain rare earth (RE) and rare earth elements (REE). The multi-component structure and dense packing of minerals in the aluminosilicate matrix of the ore make it difficult to be blocking out. Determination of the optimal ore blocking method in order to extract RE and REE is an urgent task for today. The purpose of this work is to develop an effective method of leaching RE, REE and "white soot" from the weathering crust ores of the Kundybay deposit. Methods. Processing with soluble ammonium, magnesium and aluminium salts will allow estimation of the state of RE and REE in the ore. The indicator of RE and REE blocking out during leaching with sodium hydroxide is the transfer of silica into solution, due to which RE and REE form their own hydroxides, which can be subsequently transferred into solution by acid treatment. Acid leaching with sodium pyrosulfite, hydrofluoric acid and sulfuric acid will allow the RE and REE to be immediately transferred into solution. Results and Discussion. The main characteristics of the Kundybay deposit weathering crust ore were determined, such as: silica content, moisture content, base metals, RE and REE. Conclusion. The degree of extraction of RE and REE by soluble salts of ammonium, magnesium and aluminium did not exceed 2%, which indicates the existence of RE and REE in the form of their own minerals. Leaching with sodium hydroxide showed low recovery of silica, with RE and REE remaining in a difficult-torecover form. Leaching with a mixture of sodium pyrosulfite, hydrofluoric and sulfuric acids is a promising method for RE and REE recovery due to the complex effect of the components of this mixture.

Permissible Extrapolation Justification of the Multiplicative Multifactorial Model and Its Application to the White Soot Production Technology

The solution to a specific technological problem is combined with the methodological development of a nonlinear multifactorial relationship to justify the boundaries of its extrapolation beyond the experimental range used. White soot was produced through two-stage carbonization of a silicate solution (composition, g/l: Na2O = 126.5, SiO2 = 107.7, Al2O3 = 3.1), obtained after processing waste tailings with carbon dioxide in a recirculation system. The influence of the deposition duration, temperature, and final pH value of the pulp on the formation of the specific surface area (Ssp, m2/g) of white soot was studied. The specific surface area was calculated from the average diameter of the white soot particles measured using an electron microscope. A multifactorial experiment was designed, and the experimental results were processed using a probabilistic deterministic method for experiment design (PDED) to obtain a nonlinear multiplicative combined model. A new interpretation of the subordination of the nonlinear multiple correlation coefficient R and the R2 value was given as relating to the structural and adaptive components of complex self-organizing systems. This determines their use for assessing the ratio of the basic R and extrapolated R2ranges of variation for each factor and any combinations thereof and multifactorial dependence in general. The results are presented in the form of multifactor tabular nomograms measured by the number of multifactor cells in localized areas of optimal sets that allow isolation by one or another combination of factors. The technological object of extrapolation of the ‘white soot’ production is linked to the solution of emerging methodological problems and illustrates the accessibility of the engineering application of the proposed method for combining nonlinear and linear approaches to mathematical experimental design. Doi: 10.28991/HIJ-2024-05-03-08 Full Text: PDF

STUDIES ON EXTRACTION OF COPPER FROM SULFURIC ACID SOLUTION AFTER THERMOCHEMICAL ENRICHMENT OF ROUGH CONCENTRATE

One of the processes of complete and complex extraction of valuable components is the desiliconization of final tailings to increase the content of concentrate and obtain marketable products in the form of white soot and copper cathode. This study aimed to investigate the possibility of further extraction of copper from the sulfuric acid solution obtained after the thermochemical enrichment of rough copper concentrate on a temperature range of 300-500°C. Acorga M5774 extractant and Elixore 205 diluent served to extract copper from the pregnant solution containing 9.59 g/l copper and 24.6 g/l iron. The study of the extractant performance and parameters involved plotting the isotherms of extraction and re-extraction curves. The result shows thermochemical enrichment of the rough concentrate using alkali and subsequent leaching with further copper extraction. The concentrate water leaching yielded 88.0% silicon recovery and 96.15% copper recovery. The copper recovery was 97.9%, with an organic-to-water phase ratio of 1.2. From the dependence of iron transfer on the copper saturation of the organic phase, it follows that if the latter is low, the rest of the extractant will absorb iron, so some excess copper content is required.

STUDYING THE THERMOCHEMICAL CHARACTERISTICS OF SINTERING WITH ALKALI CONCENTRATE FROM WASTE COPPER TAILINGS

A long period of deposit development leads to a reduction in the volume of balance reserves of ores, while the volume of accumulation of waste (tailings) from mining and processing production increases. In connection with this, an urgent problem is the processing of waste tailings, which can serve as an additional source of commercial products of non-ferrous metals. The set objectives can be achieved by implementing comprehensive extraction of valuable components, reducing fuel, and energy costs at the stage of low-temperature sintering to produce white soot (grade BS-100). In order to determine the amount of heat of chemical reactions during sintering of rough copper concentrate with sodium hydroxide, thermochemical calculations were carried out. For the research, we used rough copper concentrate with a copper content of 4.40% and silver of 77.03 g/t. An equation has been obtained for calculating the heat of chemical reactions of rough concentrate sintering. According to this equation, the greatest contribution to the heat release is provided by the iron content (60%), three times less and equally (19%) - copper and silicon and about 0.2% is absorbed by aluminum. The thermal effect of sintering will be -920.45 kW·h/t of concentrate. From the heat balance of sintering it follows that with an alkali consumption of up to 200% of the mass of the concentrate. The heat of chemical reactions will be sufficient for the autogeneity of the process. Research has been carried out on sintering the concentrate with alkali in the temperature range of 250-500 °C and obtaining white soot from a productive leaching solution with the extraction of 60% silicon. White soot (mSiO2·nH2O) was isolated by two-stage carbonization of a silicate solution with carbon dioxide in a recirculation system with further washing of the precipitate with a solution of sulfuric acid. For citation: Karimova L.M., Kairalapov Ye.T., Makascheva G.K., Kharchenko Ye.M. Studying the thermochemical characteristics of sintering with alkali concentrate from waste copper tailings. ChemChemTech [Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol.]. 2024. V. 67. N 7. P. 72-79. DOI: 10.6060/ivkkt.20246707.7004.

Enrichment of Iron-containing Concentrate with Ammonium Hydrofluoride

The rationality of using ash and slag waste from coal-fired TPP to obtain high-quality iron-containing concentrate (FC) is demonstrated. Using the method of wet magnetic separation of ash and slag waste from TPP, FC is extracted with Fe2O3 content of 59.2 %. It has been established that the method of chemical enrichment with ammonium hydrofluoride can increase the Fe2O3 content in FC to 79 %; a by-product of the reaction between FC and NH4F•HF is high-quality amorphous silica (white soot). The effect of process temperature on the composition of the resulting FC has been studied, at that the phase composition of iron oxides remains virtually unchanged. Optimal modes of the process are proposed.

Cementless Compositions for the Restoration of White Stone Based on Lime Binder and Silicon Dioxide.

The condition of architectural monuments is directly influenced by various factors, such as anthropogenic, natural, and technological, leading to the degradation of both structures and construction materials, ultimately resulting in irreversible damage. These factors diminish the quality of construction materials, contributing to alterations and the destruction of the appearance and structure of white stone. The primary objective of this research is to develop cement-free compositions for restoring ancient masonry materials. Tests were conducted at the BM Department of VlSU using modern equipment. New material compositions for restoration have been devised, combining lime and silicon dioxide with chemical additives to enhance adhesive and strength properties. Adhesive strength increases by 1.5 times with the addition of white soot (silicon dioxide). Moreover, the incorporation of silicon dioxide positively impacts compressive strength (from 10.6 to 15.6 MPa), surpassing the strength of composites without white soot by 1.5 times. XRD confirms the developed composite's similar phase composition to white stone, supported by optical microscopy and SEM results. Restoration composites based on these compositions exhibit homogeneous structures compatible with white stone and demonstrate high adhesion levels. These results make the proposed compositions promising for white stone restoration, ensuring structural and chemical compatibility with the restored surface.

Formation and properties of block vanadium SiO<sub>2</sub> nanomaterial catalyst for SO<sub>2</sub> oxidation

A method for producing a block vanadium catalyst for the oxidation of sulfur dioxide has been studied, which includes the stage of preparing a honeycomb structure framework based on silica raw materials in the form of white soot, followed by applying a substrate in the form of amorphous silicon dioxide and an active component to the surface of the channels. Data on the structural and mechanical properties of the honeycomb catalyst paste have been obtained. A mode of heat treatment of molded products with the production of mechanically strong blocks as carriers of the vanadium catalyst is proposed. Information about the performance of a block vanadium catalyst in comparison with an industrial catalyst of a granular form is given. Ill. 4. Ref. 14. Tab. 1.

HYDROFLUORIDE PROCESSING OF TAILINGS FROM WET MAGNETIC SEPARATION OF TITANOMAGNETITE TO OBTAIN AMORPHOUS SILICON DIOXIDE

A method for the opening of silicon-containing technogenic feedstock using an aqueous solution of ammonium bifluoride (NH4HF2) with subsequent production of amorphous silica has been developed. In this work we examined wet magnetic separation tailings (WMST) – iron titanium-magnetite ore enrichment rejects that are formed in huge quantities and stored in sludge depositories at concentrating plants. The main rock-forming minerals of WMST are resistant silicates – pyroxene, amphibole, plagioclase and olivine with the total SiO2 content of about 50%. It was established that fluorination of silicon-containing minerals begins during mechanical dispersion of a dry reaction mixture at room temperature. The thermodynamic calculations confirm active interaction of components in the composition of mineral complexes already at 25 ℃, some of the processes being exothermic with entropy reserve. When the temperature increases to 90 ℃ and the duration of leaching to 5 h, the extraction of silicon in the form of soluble ammonium fluorosilicate grows. Insoluble calcium and magnesium fluorides and sparingly soluble under leaching conditions ammonium fluorometallates, as well as a part of unreacted rock are formed in the insoluble residue. Under the most effective desilication conditions (20% NH4HF2 solution, L:S=4:1, 2 h), the residual content of SiO2 decreases to 1–2%. The synthesis of finely dispersed amorphous silica (SiO2) was performed by hydrolytic deposition when the value of рН of clarified ammonium fluorosilicate solution was reduced by adding ammonia. It was shown that gradual introduction of hydrous ammonia (5 ml/h) into diluted fluorosilicate solution with a concentration of less than 5 g/l Si while constant stirring leads to the formation of spherical silica nanoparticles. The degree of silica extraction from tailings in the process of hydrofluorination of 20% NH4HF2 solution at 90 ℃ for 2 h was 98%, and the content of impurities in amorphous silica did not exceed 1–2%. Separation of finely dispersed suspension of insoluble fluorides and hydroxide impurities formed during stepwise hydrolysis of fluorosilicate solution to рН value less than 5 is a necessary condition for producing pure silica SiO2. The final product, similar to “white soot” in properties, is characterized by predominant particle size in the interval of 2-20 nm, a large surface area 230-360 m2/g and a low pycnometric density 1.62 g/cm3. For citation: Medyankina I.S., Pasechnik L.A. Hydrofluoride processing of tailings from wet magnetic separation of titanomagnetite to obtain amorphous silicon dioxide. ChemChemTech [Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol.]. 2023. V. 66. N 2. P. 70-77. DOI: 10.6060/ivkkt.20236602.6706.

СОРБЦИЯ КАДМИЯ И СВИНЦА ВЕЩЕСТВАМИ, ПЕРСПЕКТИВНЫМИ ДЛЯ СОЗДАНИЯ КОМПОЗИЦИОННЫХ ПРЕПАРАТОВ НА ОСНОВЕ ГЕКСАЦИАНОФЕРРАТОВ

The development of new drugs and feed additives to reduce the accumulation of anthropogenic and natural toxicants (heavy metals, radionuclides, mycotoxins, pesticides, etc.) in the body of farm animals and livestock products remains an urgent task. One of the ways to solve it is to create multifunctional products containing ferrocyanides (hexacyanoferrates) of transition metals as active substances. In medicine and veterinary medicine, enterosorbents based on compounds of this class are used as independent pharmacological agents, and in the form of composite preparations, which are obtained by fixing ferrocyanides on carrier substances of different origin and chemical composition. To study the possibility of using certain substances as carriers in the creation of new composite preparations and to assess their effect on the detoxification properties of ferrocyanides, the sorption efficiency of a number of mineral and organic substances with respect to Cd and Pb was studied. It was found that the background content of Cd and Pb in the tested substances does not exceed the maximum permissible levels of these toxicants in feed, feed additives and veterinary preparations. Under in vitro conditions, the biomass of the fungus Inonotus obliquus (chaga), the preparations ferrocin, bifezh and KhZh-90, zeolite tuff shivyrtuin, smectite dioctahedral, white soot and chitosan succinate have the greatest efficiency of Cd and Pb sorption (with respect to Cd – 50.4-89.0%, Pb – 58.3-95.1%). The combined presence of Cd and Pb reduces the sorption capacity of most of the tested substances by 1.6-63.6%.

Flame synthesized tetragonal TiO2 nanoparticles for Methylene Blue and Congo Red dye removal applications

Commercially affordable titanium dioxide nanoparticles (TiO2 NPs) catalyst with low toxicity and high efficiency, were prepared by scalable Flame pyrolysis method. For this, titanium iso-propoxide solution was directly burned in air, the product in the form of white soot was collected over water cooled conical flask. The prepared nanoparticles were characterized by various sophisticated techniques viz. UV–Visible, FTIR, XRD, SEM, EDS and TEM. The SEM, TEM and Zeta Potential Analyzer illustrated spherical morphology of the synthesized TiO2 NPs with an average size of about 150 nm. The XRD confirmed formation of prominently dominated anatase phase co-existed with traces of rutile phase. The combination of anatase and rutile phase exhibited increased catalytic activity for removal of dyes. The flame synthesized TiO2 nanoparticles exhibited strong dye removal efficiency of 97.64 % for Methylene Blue and 92.39 % for Congo Red dyes respectively, making it vitally important for the waste water treatment and industrial dyes removal applications. Probable dye degradations mechanism on the surface of TiO2 NPs also proposed based on the LCMS results.

Механохимический синтез пористых кремнийоксиуглеродных композитов

The work is devoted to investigation of the process of mechanochemical synthesis of porous silicon oxycarbide composites. The synthesis was carried out by mechanical treatment of several mixtures of activated carbon and white soot with different mass ratios. Samples were investigated using such methods as X-ray diffraction, infrared spectroscopy, low-temperature nitrogen adsorption/desorption and potentiometric titration. Synchronous thermal analysis including thermogravimetric analysis and differential scanning calorimetry was performed. The results of X-ray diffraction analysis showed that no new phases were formed in the process of mechanochemical synthesis, and the structure of composites obtained can be characterized as highly amorphous. The possibility of activated carbon and white soot to be chemically bonded with the formation of silicon oxycarbides, which act as a binder in the composite structure, during intensive supply of mechanical energy to raw materials was proved. Thermal stability of silicon oxycarbides formed and the amount of free carbon that was not bonded with silicon dioxide were estimated by synchronous thermal analysis. It was established that the initial mixture composition significantly affects the surface chemistry of composites synthesized, which is expressed by a change in concentration of different surface functional groups. A possible mechanism of solid phase interaction between activated carbon and white soot resulting in the formation of Si–O–C bonds was proposed. Investigation of porous structure of composite materials obtained showed that the specific surface area and pore volume become lower with an increase in white soot concentration in the initial mixture. It is possible to adjust the porous structure of composites by changing the activated carbon to white soot mass ratio.

The COMPARISON OF SORPTION PROPERTIES OF SILICON-CARBON ADSORBENTS SYNTHESIZED BY VARIOUS METHODS

Siliconoxycarbon adsorbent was synthesized by mechanochemical activation of activated carbon BAU and by sol-gel technology by deposition of sodium metasilicate on the surface of coal, followed by drying and calcination of the samples and tetraethoxysilane to remove the solvent. To study the morphology of adsorbent particles, the method of scanning electron microscopy was used, according to which the nature of the interaction of activated carbon with sodium metasilicate and tetraethoxysilane was judged. Mechanochemically modified activated carbon is a fine powder: both large crystal-like particles and small shapeless ones are visible. During the joint mechanical treatment of activated carbon and white soot, agglomerates of amorphous white soot are noted, which are layered on activated carbon particles. The adsorbent obtained by the sol-gel method has large clusters of amorphous silicon dioxide covering the coal particles, almost completely "hiding" them. The results of studies of silicon oxycarbon adsorbents by infrared spectroscopy indicate the appearance of absorption bands characteristic of vibrations of Si-O-C bonds. For the sol-gel method, the absorption bands are more diffuse. Using the resulting composite as an adsorbent, studies were carried out on the efficiency of extraction of the thiazine dye methylene blue from aqueous solutions and defluorination of extractive phosphoric acid. For the mathematical description of the adsorption process, traditional models of adsorption kinetics (pseudo-first and pseudo-second orders) were applied. It has been established that the presence of silicon-containing compounds reduces the defluorination temperature by increasing the proportion of SiF4 in gaseous products. This allows you to increase productivity and reduce energy costs for defluorination.

Processing Technogenic Raw Materials-Phosphorus Slags with the Production of Precipitated Nanosilica and Simultaneous Recovery of Valuable Components

The paper provides a flow sheet of the phosphorus slag processing to produce precipitated silica (white soot). The process conditions for opening phosphorus slag at the I stage of leaching have been selected: the nitric acid concentration is 3.5 mol/dm3; the ratio S:L = 1:3.5; the temperature is 60 oС; and the process duration is 1 hour. The parameters of the white soot production II stage have been determined: the HNO3 concentration is 6.5 mol/dm3; the ratio S:L = 1:3.5; the temperature is 50 oС; and the process duration is 1 hour. The temperature effect on the white soot structure and the specific surface have been established. At optimal process parameters, the white soot batches have been obtained with the main SiO2 component content of 88.2 and 90.5 %, and a specific surface of 170 and 182 m2/g, respectively. The through recovery of silicon into a commercial product is 98.0 % of its initial content in slag.

СОРБЕНТЫ НА ОСНОВЕ СОПОЛИМЕРОВ ПРОИЗВОДНЫХ АКРИЛОВОЙ КИСЛОТЫ, АКРИЛАМИДА И НЕОРГАНИЧЕСКИХ НАПОЛНИТЕЛЕЙ

A new bisacrylamide, containing a thiocarbamidyl radical is synthesized and later used as a sealant to obtain copolymers based on acrylic acid (AT), diatrium salt (Na-AT) and acrylamide (AA) in water. The copolymer, depending on the number of sutures, the dynamics of its absorption over time have been studied. The ability of a copolymer water jelly to combine with inorganic silicate fillers has been studied. As inorganic silicate fillers, Montmarrylonite clay, aerosil - 200, aerosil - 300, white soot, kaolin were used: The dynamics of water absorption of the composite (JMC) combined with the inorganic filler of the water-copolymer of the copolymer have been studied. The results are presented in this article. The compound developed using kaolin has been shown to have a higher water absorption. The water absorption capacity of the PMB has been studied by gravity. Sorbent samples were developed in combination with sand, 0.3-0.5 mm particles of PMB, river and sea, which is recommended to be used to remove heavy metal ions from the effluent, bringing their concentration in the water to the allowable limits. Given the sorption properties of the developed sorbents, it is recommended that they be used to remove ions of other metals (Со+2, Ni+2, Cd+2, Pb+2, Hg+2 , etc.) from the aqueous medium. The sorption capacity of the sorbents presented in this work is mainly due to the multifunctionality of the copolymer, as well as the stability of the compounds formed by the interaction of the functional groups of the copolymers with the metals. As shown in this work, the nature and structure of inorganic fillers are important for the quantitative removal of metal ions from wastewater.

Modification of Compounds Based on Ethylene–Propylene–Diene Rubbers Using an Oligomeric Unsaturated Polyketone

The efficiency of using an oligomeric unsaturated polyketone prepared by ketonization of cis-1,4-butadiene rubber with nitrogen(I) oxide (N2O) for the modification of physicomechanical properties of elastomer compounds based on Keltan 512 and SKEPT-50 ethylene–propylene–diene rubbers was demonstrated. The modification leads to a decrease in the viscosity of filled rubber stocks, facilitating their processing on the process equipment, and to more uniform dispersion of the silica filler (BS-1290 white soot); it enhances the elastic and strength characteristics of the vulcanizates by a factor of up to 2–2.5 relative to the unmodified compounds.

НАПОВНЮВАЧІ НА ОСНОВІ ДІОКСИДУ КРЕМНІЮ ДЛЯ ПОЛІМЕРНИХ КОМПОЗИЦІЙНИХ МАТЕРІАЛІВ КОНСТРУКЦІЙНОГО ПРИЗНАЧЕННЯ

The finding a filler for the creation of polymer composite (PC) for constructional purposes, which is able not only for improving the level of polymer matrix properties, but also significantly for reducing its price was conducted. It was determined that such fillers are silicas of various modifications, which due to the developed surface and active “silanol” groups on it are capable of physical and chemical interaction with the polymer matrix. The most common industrial brands of silicas, such as aerosіl, white soot and silica gel were selected for research. As a result of microscopic investigations it was obtained, that particles of silica of such brands as aerosil and white soot, both in the initial form and in the polymer matrix are actively aggregated, and create agglomerates up to tens of microns. This phenomenon is not observed when using silica gel. Therefore, it is more appropriate to be used as the fillers for PC for construction purposes than other investigated materials. The method of synthesis of silica gel with a high degree of chemical purity was presented. Comparative investigations of the physico-mechanical, thermophysical and tribotechnical properties of constructural polymer composites, based on aromatic polyamide, filled by industrial and synthesized silica gel were performed. It was obtained that PCs with synthesized silica gel have higher level of properties than industrial ones. This is due to the fact that the primes presented in industrial silica gel reduce its reinforcing effect on the polymer matrix and adversely affect the friction process during the friction interaction of the obtained PC with steel.

Исследование влияния наночастиц диоксида кремния на поверхностные свойства кремнийорганических покрытий

Изготовлены покрытия на основе метилфенилсилоксанового каучука марки СКТН-ф с различным содержанием полиметилсилоксанового масла марки ПМС-200 и наночастиц белой сажи БС-100. Проведены исследования стойкости к истиранию и гидрофобных свойств (угол смачивания, угол скатывания) покрытий, адгезии льда к их поверхности. Показано, что введение в состав полимерной матрицы полиметилсилоксанового масла приводит к снижению стойкости к истиранию и понижению гидрофобных свойств покрытий и одновременно позволяет понизить адгезию льда к поверхности. Установлено, что введение наночастиц БС-100 позволяет повысить физико-механические характеристики покрытий при сохранении уровня функциональных свойств. Полученные результаты зависимости функциональных свойств от химического состава покрытий объясняются их структурными особенностями, в частности полиметилсилоксановое масло равномерно распределяется по объему полимерной матрицы, обволакивая выходящие на поверхность агломераты наночастиц белой сажи, формируя тем самым многомодальную шероховатость, которая, в свою очередь, способствует повышению гидрофобных свойств покрытия.

The Effect of the Increase in Impact Strength of Epoxy Composites by Agglomerated Nanoparticles

The influence of WS-120 white soot nanoparticles and ultrafine particles of powdered quartz (brand A) with the same chemical nature (SiO2) and size (diameter of ~150 nm) on the structure and impact strength of dispersedly filled epoxy polymers is elucidated. This is the first time that agglomerates of white soot nanoparticles with sizes of ~150 nm at their optimal concentration have been shown to almost double the impact strength of epoxy polymers, while its initial value under the effect of monolithic ultrafine particles of powdered quartz with ~150-nm particles gains only ~20%. Agglomerates of nanoparticles with optimal dimensions are found to be much more efficient for increasing the impact strength of epoxy dispersed systems in comparison with monolithic ultrafine particles.

Comprehensive Processing Technology Of Slags Of Phosphorus Industry To Produce Precipitated Silica And Rare-Earth Concentrate

<p class="TTPSectionHeading">The report presents a technological scheme of complex processing of man-made waste of phosphorus production - slag to produce highly dispersed silicon dioxide and a rare-earth metal concentrate. The technological parameters of each operation of the technology are chosen. Recovery of <span>rare-earth metals</span> from phosphorus slags during various operations was, %: leaching – 95.0; extraction - 90.2; stripping on the average ~ 93.2; the production of ∑ REM oxide concentrate is 93.9. The composition of some batches of "white soot" obtained during processing of the technological scheme is shown.</p>

Influence of synthesis conditions on the adsorption and catalytic properties of mordenite zeolite

The effect of the preliminary holding of the BS-100 “white soot” at 150–155°C for 6 to 7 h and the crystallization conditions on both the characteristics of powdered MOR zeolite samples (degree of crystallinity, composition, particle size composition, and adsorption of C6H6 molecules) and their catalytic properties in the α-methylstyrene dimerization reaction has been studied.