Firing Shrinkage Research Articles

Red mud valorization in stoneware pastes: Technical and environmental assessment

Red mud (RM), resulting from alumina production by Bayer process, is classified as hazardous waste and is, nowadays, one of the most abundant industrial waste worldwide. Currently, over 4 billion tons are stored in ponds/dried mounds and is of utmost importance to tackle this problem. This work aims to recycle RM as colouring agent in stoneware products. For this purpose, several proportions of RM (0–10 wt%) were added to ceramic pastes. The developed products with RM exhibit a reddish/brown colour. Further, the technical characteristics of the specimens with 10 wt% of RM (RM10) are within the industrial limits: firing shrinkage (7.1%), weight loss (6.9%) and water absorption (1.38%). RM10's density and flexural strength are higher than RM0, 2.16 g/cm3 and 2.07 g/cm3, and 416 kgf/cm2 and 388 kgf/cm2 respectively. Leaching tests performed in cups industrially prepared indicated that all the values were below the maximum permitted. Lastly, through a life cycle assessment, it was concluded that the carbon footprint decreases 18% when RM10 is incorporated into the stoneware paste. Therefore, this work provides a viable alternative for the management of considerable amounts of this waste and reduces the carbon footprint associated with the ceramic production process.

Ceramic Materials Based on Clay and Soapstone Waste: Thermo-Mechanical Properties and Application

In order to assess the feasibility of utilizing soapstone waste, which is generated during the production of stone blocks for fireplaces and other energy-saving devices, the effect of its addition to clay on the technological and thermal properties of ceramic materials was investigated. Two local clays and soapstone processing waste were characterized using XRD, SEM-EDS, XRF, DTA-TG, and granulometric analysis. The linear firing shrinkage, water absorption, density, flexural strength, thermal conductivity, specific heat capacity, and thermal shock resistance of the fired ceramic samples were analyzed. The results have shown that addition of soapstone waste to clay in an amount of 40 wt.% increases flexural strength, enhances thermal stability, and, additionally, reduces the thermal conductivity of the experimental samples. The technological properties of the final product meet the standard requirements for ceramic tiles.

Viability of Bauxite Deposits from Catalonia (Spain) for Ceramic Applications

This study provides a characterization of materials from wastes and outcrops of two inactive bauxite mines located close to Sant Joan de Mediona and Peramola, Spain. Mineralogy was determined via powder X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). Thermal properties were measured via differential thermal analysis–thermogravimetry (DTA-TG) and gresification tests. The crystalline phases are medium-high crystalline kaolinite and variable amounts of illite, quartz, calcite, boehmite, hematite and rutile/anatase. DTA show two endothermic peaks produced by the dehydroxylation of minerals: the first peak, at 530–538 °C, belongs to boehmite; the second peak, at 535–568 °C, corresponds to kaolinite. An exothermic peak at 950–978 °C is associated with mullite crystallization. The optimal sintering temperatures obtained from the gresification curves (firing shrinkage and water absorption) were 970 °C for carbonate-poor, illite-rich clays; 1100 °C for illite- and carbonate-poor samples; and near 1190 °C for carbonate-rich materials. The carbonate-poor samples fired at 1300 °C contain sillimanite and mullite, and the carbonate-rich materials are rich in gehlenite, anorthite, and hedenbergite. The mineralogy of these materials is sufficient to obtain ceramic materials with suitable properties, but not their low plasticity. They could be used in the formulation of bricks or as part of mixtures to produce refractory ceramics.

Glazing of 3D-Printed Silica to Reduce Surface Roughness and Permeability

The advantages that 3D printing brings to the development and production of customized structures make it suitable for use in the space industry, since spacecraft components are rarely produced in large series. This work explores the use of stereolithography printing of a silica resin for microfluidic applications, in particular small-scale microthrusters, where an impermeable high-temperature material with a smooth surface is required. The printing accuracy, firing shrinkage, surface roughness and permeability of 3D-printed ceramic samples were investigated. Furthermore, glazing of the ceramic material with a stoneware glaze was performed and evaluated with respect to its effect on surface roughness and gas permeability. Open microchannels with diameter down to 250 µm were obtained. However, the accuracy was poor. Surface roughness (Sa) of the unglazed material was between 2.4 and 20 µm in green state and 4.2-16 µm after firing, depending on the layer thickness and printing angle of the sample. Half of the unglazed samples were permeable, owing to porous areas at the interfaces between the printed layers. Two glazing methods were investigated: dip coating and airbrushing. For the latter, two amounts of coatings were explored. Dip coating and airbrushing with the larger amount of coatings resulted in uniform and smooth glaze layers. The smoothest surfaces, with Sa less than 0.2 µm, were obtained using airbrushing. Glazing made all samples impermeable, no matter the method used. Finally, the potential of the material in the suggested application was demonstrated through operation of a printed and glazed microthruster nozzle.

Investigation of the effects of red clay on the structural properties of chamotted clay bodies

Chamotte means fired clay. It is also called Grog and it can have many particle sizes, from fine to coarse. The composition formed by the addition of chamotte to various clay compositions is called chamotte mud (CM). The most preferred and widely used muds in the production of artistic ceramic products are chamotte mud and red pottery mud (R-PM). The sintering, linear shrinkage, water absorption, and color properties of these muds vary depending on their components and firing temperatures. Chamotte mud has properties that make it suitable for use at high temperatures (1150-1200 oC). The obtained products, however, have a high-water absorption value, because it deforms in high-temperature firings, the red Kınık pottery mud used in the study is typically used for artistic productions at low temperatures such as 900-1000 oC. Ceramic artists may prefer to combine and use both types of mud to enhance the color effects and shaping properties in their works. 
 The aim of this study is to reduce water absorption of the body while increasing firing shrinkage, in other words, increasing shrinkage during sintering by adding red pottery mud to chamotte mud and also to optimize the tendency of the R-PM to undergo deformation with temperature. As a result, the products obtained, particularly those produced for artistic outdoor use, will have a longer lifetime. In experimental studies, 6 recipes were produced by combining chamotte and red mud in specific ratios, and the changes in properties such as water absorption, linear shrinkage, color, gloss, microstructure, and sintering behavior of ceramic bodies as a result of firing at 1160 oC were investigated.

Effect of oxide additives on densification of terracotta

In this study, the effect of the addition of a few oxides (TiO2, Cr2O3, Fe2O3 CaCO3, and MnO2) on the sintering behaviour and sintered properties of a raw clay are reported. Static sintering study revealed that, except CaCO3, all remaining compositions showed similar values of firing shrinkage, which is greater than the control batch. Both TiO2 and MnO2 addition leads to lower open porosity at 1000 °C. Dynamic sintering studies at a heating rate of 5 °C.min−1 reveal that the onset of vitrification is in the following order: MnO2 > CaCO3 > control, TiO2 > Cr2O3, Fe2O3 and few oxides (TiO2, Cr2O3 and Fe2O3) improve the firing range and sintering compared to control composition. The terracotta body's flexural strength was influenced by porosity and chemistry. An overall negative linear correlation between flexural strength and open porosity was evident. The beneficial role of Cr2O3 and TiO2 over other oxides can also be clearly discerned. The lightness value (L*) of the terracotta body did increase only with TiO2 addition. A clear trend of change in chromacity components (a* and b*) was affected by oxide addition and firing temperature. The incorporation of Fe2O3 improved the characteristic red colour of the terracotta, along with other positive effects on the sintering of the terracotta body.

Clay/Fly Ash Bricks Evaluated in Terms of Kaolin and Vermiculite Precursors of Mullite and Forsterite, and Photocatalytic Decomposition of the Methanol–Water Mixture

This study focused on mullite-based and forsterite-based ceramic bricks fired at 1000 °C from mixtures of fly ash (40 mass%) and kaolins or vermiculites (60 mass%). The structural, physical, and mechanical properties were characterized by X-ray powder diffraction, nitrogen physisorption, mercury porosimetry, thermogravimetry, and compressive strength. In the development of green-material-derived photocatalysts, we evaluated fly ash ceramic bricks based on kaolins and vermiculites, which deserve deeper research. Alkali potassium in the mixtures positively influenced the reduction of the firing temperature, shrinkage, small porosity, and high compressive strength of ceramic bricks. The crystallization of mullite in fly ash was observed on exotherm maxima from 813 to 1025 °C. Muscovite/illite admixture in kaolins precursor of mullite-based ceramics reduced the crystallization temperature of mullite by up to 70 °C. Vermiculite–hydrobiotite–phlogopite in mixed layers of a raw vermiculite precursor of forsterite-based ceramics controlled the formation of enstatite and forsterite in the temperature range from 736 ± 6 °C to 827 ± 6 °C. Mullite- and forsterite-based ceramic bricks were also investigated for photocatalytic hydrogen production. The photocatalytic generation of hydrogen in the presence of mullite-based ceramic bricks was positively correlated with the percentages of Fe2O3 in the lattice of mullites and in the presence of forsterite-based ceramics with the presence of diopside. Mullite-based ceramic produced the highest yield of hydrogen (320 µmol/gcat after 4 h of irradiation) in the presence of mullite with the highest 10.4% substitution of Fe2O3 in the lattice. The forsterite-based ceramic produced the highest hydrogen yields (354 µmol/gcat after 4 h of irradiation) over more active diopside than forsterite.

Exploitation of rice agriculture wastes in clay masonry units preparation

This paper deals with the exploitation of both rice husk and straw as partial constituents in the fabrication of clay masonry units. This allows for using harmful wastes that were otherwise burnt besides lowering the amount of clay used in brickmaking. Clay was mixed with different percentages of each waste and water was added in a suitable amount to produce mixes that were molded and dried. Drying shrinkage and green compressive strength were determined for these dry samples. The firing of the dried samples was then carried out at temperatures ranging from 700 to 800ºC with a one-hour soaking time. The following properties were investigated as a function of both firing temperature and percent waste added: loss of ignition, firing shrinkage, cold and boiling water absorption, saturation coefficient, apparent porosity, bulk density, and compressive strength. The properties of masonry units produced by firing at 700ºC and containing 3% of either waste were in good agreement with ASTM C 62 specifications for clay made bricks.

TO COMPARE THE MARGINAL FIT, INTERNAL GAP AND FIRING SHRINKAGE OF METAL CERAMIC CROWN FABRICATED BY CAD-CAM AND CONVENTIONAL METHOD:AN INVITRO STUDY

Purpose: The purpose of this in vitro study is to compare the marginal fit , internal gap and firing shrinkage of metal ceramic crown fabricated by cad-cam and conventional method. Materials And Methods: Atotalof30workingmodels,i.e.15modelseachgroup:conventionallost-waxandmillingwere used.Marginaldiscrepancywasevaluatedattheframeworkandporcelainstepsthroughscanningunder a stereomicroscope. Then, the crowns were cemented to the related die and the marginal gap was measuredundera stereomicroscopeandthensectioningwasdoneandinternalgapwasevaluatedusing scanning electron microscopy (SEM). The data was analyzed using the independent t test and the one- way analysis of variance (ANOVA). The significance level was set at0.05 Results: Among the experimental group, group 2 cad cam shows the better marginal gap in all aspect compare to group 1 conventional technique in both beffore after ceramic firing. Group 1 shows the better internal fit at 4 places out of 5 that is marginal opening area was better in group 2. Conclusion: Withinthelimitationofthisinvitrostudy,itwasconcludedthatforallthefeaturesCAD-CAM techniques gave better results except internal gap, when compared with the conventional methods and there was a significant statistical difference between the two comparisongroups.

Fabrication of Thermal Insulation Bricks Using Pleurotus florida Spent Mushroom.

This study explores the potential for making lightweight bricks via the use of dry, pulverized spent mushroom materials (SMM) as a thermal insulator. There are five distinct replacement proportions of SMM that are used, and they range from 0% to 15% of the weight of the clay. The firing of the fabricated bricks at temperatures of 700, 800, and 900 °C led to the development of pores on the interior surface of the bricks as a consequence of the decomposition of SMM. The impact of SMM on the physicomechanical characteristics of fabricated bricks is assessed based on standard codes. Compressive strength, bulk density, and thermal conductivity decreased as the SMM content increased, reaching up to 8.7 MPa, 1420 kg/m3, and 0.29 W/mK at 900 °C and 15% substitution percentage. However, cold water absorption, boiling water absorption, linear drying shrinkage, linear firing shrinkage, and apparent porosity increased with the increase in SMM, reaching 23.6%, 25.3%, and 36.6% at 900 °C and 15% substitution percentage. In the study simulation model, there was a significant improvement in energy consumption, which reached an overall reduction of 29.23% and 21.49% in Cario and Jazan cities, respectively.

Investigation of Physico-Mechanical Properties and Multi-Objective Optimization of Industrial Ceramic Tiles Using Response Surface Method: Sintering Temperature and Time

Firing process, which is highly difficult part to control, is the most important step in the ceramic manufacturing process. In this study, manufacturing technology and statistical methods were used together to produce low-cost and high-quality products at the optimum sintering temperature and sintering time. Physio-mechanical properties of ceramic tiles manufactured on the industrial scale were optimized using Central Composite Design of Response Surface Method. The regression coefficients of the obtained models (R 2) were evaluated according to the variance analysis (95% confidence level) results and determined as 97.70% for flexural strength, 98.50% for water absorption, and 97.90% for fired shrinkage. The standard deviation of flexural strength, water absorption, and firing shrinkage values, calculated according to the theoretical results, were 1.397%, 0.00265% and 0.0255%, respectively. The samples with desired physical properties were obtained with the developed models by examining the interactions of variables at the industrial conditions.

Recycling of bypass cement kiln dust in the production of eco-friendly roof tiles

Most of the research of building materials companies at present focuses on recycling waste to minimize the cost of their products and for the safe disposal of these wastes. In this work, the by-pass cement kiln dust (BCKD), the dust that is discarded from the kiln system was used for the preparation of roof tiles. It is partially used to substitute clay in percentages from 5% up to 25%. to prepare roof tiles abiding by ASTM C1167 for two objectives, the safe disposal of waste and the production of low-cost roof tiles. The raw materials were assessed by particle size analysis, XRD, and XRF. The mud was poured into moulds with dimensions of 150 * 30 * 25 mm3 and pressed under a pressure of 10 MPa then dried. The dried samples were fired to temperatures 1000, 1100, and 1150 °C with a soaking time of one hour for each temperature. The linear firing shrinkage, water absorption, bulk density, and breaking strength were measured to determine the properties of the fired specimens. The initial rate of absorption and runoff properties were also determined for the optimal samples. The results showed that samples containing 8% and 12% of BCKD waste that fired at 1100 °C and 1150 °C had cold water absorption of 14% and a saturation coefficient of 0.85, both of which were below the maximum values of the standard limits. Furthermore, the measured breaking strength of about 2700 N was much higher than the necessary minimum value. The results showed that samples met the requirements of ASTM 1167 for clay-type roof tiles containing 8% BCKD waste and fired to 1100 °C. For economic and environmental benefits, 1100 °C firing temperature is recommended than 1150 °C. The initial rate of absorption was found to be 2.8 kg.m−2 and the runoff properties were found to be 0.02 mg.l−1, 7.53, 110.5 mg.l−1 for total dissolved solids, pH and total solids respectively.

Investigation of Wastes Plastic and Glass to Enhance Physical - Mechanical Properties of Fired Clay Brick

Abstract Around the world, large amounts of plastic and glass waste have been collected. This work is given as a way to reduce this material. This paper aims to investigate how fired clay bricks' physical and mechanical properties are affected by plastic/glass (P/G) powder. It is used as a replacement for clay, varying the plastic/glass content 00/20, 05/15, 10/10, 15/05, and 20/00 weight %. The ratio of soil to water remains constant 0.3. The maximum temperature is presented after three fire phases. The temperatures are 300 °C for the first, 600 °C for the second, and 900 °C for the third. Results for the physical properties showed an increase in the water absorption of clay brick specimens as the plastic content increased; in addition, efflorescence was increased with plastic powder. However, the density and firing shrinkage decrease with plastic quantity. Also, the experimental results showed a decrease in water absorption and efflorescence when the glass powder was increased. While the density is higher when glass powder is 20 %. According to the findings on mechanical properties, clay brick samples with higher plastic powder content 20 % displayed a decrease in compressive strength and flexural bending strength, i. e. the mechanical properties (compressive and flexural strengths) are increased with the increased

Chromite ore addition to serpentinized magnesite mining wastes for the production of refractory products following thermal treatment

Taking a circular approach to mining facilities requires the further exploitation of produced solid wastes, which are now considered as potential raw materials. This research aims to the re-utilization of specific mining wastes, containing mainly geologically degraded serpentinized minerals, produced during the minerals’ enrichment process of extractive magnesite industry, combined with the addition of chromite ore, aiming to the upgrading of refractory properties of the product, by applying the appropriate thermal treatment. A representative sample examined, corresponding to the proper blending of different mineral waste samples from several waste piles of mining area, combined with various chromite ore’s content, followed by the investigation of optimum thermal treatment, considering the applied temperature and time. The scope was to maximize the (desired) forsterite mineral phase in the product and, hence, to improve its refractory properties. The optimum results (e.g., considering the firing shrinkage level and the mechanical strength) achieved by the application of thermal treatment at 1300 °C and after heating time for 120–240 min. The refractory properties generally improved after mixing of examined mining wastes and chromite ore, due to the achievement of the best molar ratio of constituents [MgO]/[SiO2] = 2.2, regarding the additive, enhancing the formation of forsterite, whereas the application of heating temperatures over 1300 °C led to the melting of enstatite mineral phase, resulting to the degradation of product. The obtained results reveal that the produced sintered products can exhibit better refractory properties, and can be used as refractory raw materials for relevant applications up to 1300 °C.

Valorization of oil well drilling cuttings as a raw material in ceramic manufacturing

This study investigates the effect of clay replacement by oil well drilling cuttings (DC) in ceramic materials manufacturing. DC was added at 0, 15, 30 and 45 wt%. The raw materials were characterized by physical, chemical, and mineralogical analyses. Ceramic specimens were produced via uniaxial pressing and sintered at a constant heating rate (5 °C/min) for 90 min at three temperatures (750, 850, or 950 °C). Then, the samples were evaluated by linear firing shrinkage, apparent specific mass, water absorption, color, and flexural strength. Ceramic materials were analyzed by X-ray fluorescence spectrometry (XRF), thermogravimetric analysis (TG), Fourier transform infrared spectroscopy (FTIR), and X-ray diffractometry (XRD/Rietveld). Environmental risk assessment of ceramic products containing DC was investigated by leaching and solubilization tests. The results allow classifying the raw and the ceramic materials as non-hazardous and inert. Ceramics consisted mainly of quartz, illite, hematite, feldspar, primary mullite, and spinel. The sintering temperatures (from 750 up to 950 °C) and the increasing DC contents (up to 45%) directly affect the mechanical properties of the red ceramic, which are suitable to produce bricks, blocks and tiles. In the analyzed scenarios, the results indicated DC as an alternative raw material environmentally appropriate for the ceramic manufacturing.

Production and optimization of the refractory properties of blended Nigerian clay for high-temperature application; a non-stochastic optimization approach

High-performance materials, systems, and processes have necessitated the exploration of very high-temperature environments. Materials, particularly ceramics, which can withstand these high temperatures, have been extensively studied, even though enough emphasis has not been given to clays sourced locally in Nigeria, where there is an abundance. Also, stochastic optimization techniques has been employed to improve on system or carry out experimentation with minimal spend of resources and very high accuracy. This work extensively explored the refractory properties of blends developed from locally sourced clays (Mayo Ndaga and kachalla Sembe and Kona). The Taguchi optimization technique was employed to determine the effect of various quantities of the clays on the loss on ignition (LOI), refractoriness (RF), and firing shrinkage (FS) of the blends. It was discovered that the optimum (lowest) LOI, highest RF, and lowest FS were 11%, 1333 °C, and 0.48%, respectively. Analysis of variance also proved the significance of Mayo Ndaga on the RF and FS of the blends, with P-values of 0.038 and 0.000 at a 95% confidence level.

Recycling argan nut shell and wheat straw as a porous agent in the production of clay masonry units

The present work aims to study and compare the effect of incorporating argan nut shell (ANS) and wheat straw (WS) into clay mixtures as construction materials additives on physical, mechanical, structural, and thermal properties of fired clay bricks. Five clay mixtures were prepared, including a control sample free of waste, two clay samples containing 5 wt% and 10 w.t% of ANS (ANS5 and ANS10), two others containing 5 wt% and 10 wt% of WS (WS5 and WS10), all specimens were fired at 900 °C, and their technological properties in term of loss on ignition, firing shrinkage, water absorption, apparent porosity, bulk density, flexural strength, compressive strength, and thermal conductivity were evaluated. A reduction in bulk density and thermal conductivity has been observed with the incorporation of ANS and WS, leading to an increment in the apparent porosity and water absorption in their turn, which is typically due to the specimen’s porous structure. The thermal conductivity of clay brick samples containing 5–10 wt% of ANS or WS decreased by 5–17% and 27–46%, respectively. Thus, the thermal insulation property is improved while the mechanical properties (flexural and compressive strength) meet the requirements of the standards for clay masonry units, except for WS5 brick. Test results highlighted the potential of recycling ANS and WS in clay masonry units and thus, the production of lightweight material.

Effect of agricultural biomass wastes on thermal insulation and self-cleaning of fired bricks

This research investigates the feasibility of using dry crushed pomegranate peel waste as thermal insulator to produce light clay bricks. Pomegranate peel waste (PW) is used with different substitution levels of 0%, 5%, 7.5%, 10% and 15% of clay weight. The clay bricks were heated at temperatures of 700, 800, and 900 °C, that resulted in the formation of internal pores due to the combustion of PW. The bulk density, water absorption, porosity, shrinkage, and compressive strength are examined to evaluate the effect of using PW on the physical and mechanical properties of thermal insulation bricks. Also, the investigation of the effect of photocatalytic activity of bricks under sunlight irradiation is carried out. The use of PW increased the thermal conductivity up to 21% at 900 °C, water absorption from 22.6% in cold water to 29.1% in boiling water, density from 2.5% at 800 °C to 7.6% at 900 °C, and shrinkage from 4.3% in linear drying shrinkage to 5.4% in linear firing shrinkage. The heated brick samples at 700 °C showed greater photodegradation efficiency than firing clay at 800 °C and 900 °C. Moreover, the compressive strength decreased with the increase in replacement rate, reaching up to 74% for 15 wt% PW. This study confirms that lightweight heated bricks with low thermal conductivity and a reasonable compressive strength can be made using PW as a pore-forming agent.

Physical-mechanical properties and thermogravimetric analysis of fired clay brick incorporating palm kernel shell for alternative raw materials

This article explores the potential of incorporating palm kernel shells (PKS) from palm oil mill waste as a clay replacement for fired clay bricks. PKS, an abundant byproduct of palm oil extraction, have high cellulose content and high calorific value, making them an ideal option for clay replacement in brick making. For this purpose, clay soil was replaced with different percentages of PKS (0, 1, 5 and 10%) and subjected to a firing temperature of 1050 °C (heating rate of 1 °C/min). The physical–mechanical properties such as shape, size, colour, dry density, water absorption, thermal conductivity, porosity and compressive strength, as well as microstructural and morphological properties (XRD, SEM-EDX and digital image) and thermal analysis data (TGA-DTA) were evaluated to determine the effects of replacing PKS in fired clay bricks. The results showed that the incorporation of PKS increased firing shrinkage and porosity and decreased dry density, compressive strength, and thermal conductivity. However, incorporating more than 5% PKS resulted in lower mechanical properties (24.6 to 11.0 MPa) and higher water absorption (3 to 12%) due to increased firing shrinkage and porosity (0.3 to 0.9% and 13 to 20%, respectively). The bricks also exhibited lower density (1799 to 1645 kg/m3) and improved thermal properties (0.54 to 0.36 W/m.K) due to the development of porosity during the firing process. While the degradation of organic components was a concern, it was determined that all organic components were completely degraded below 650 °C and the bricks matured at 950 °C. The study concluded that the use of PKS as a partial replacement for clay in brick manufacture is a viable solution for waste management.

Composites With Ceramic Matrix Reinforced With Inorganic and Organic Fillers

The subject of this article is the development of composite materials using ceramic matrices (CM) to increase their strength and reduce the density and brittleness of ceramics. The purpose of this work is to reveal the effect of the content, size, and shape of the introduced fillers on the CM structure, which determines the behavior of CMs. The methods and materials of the study, the analysis of literary sources, as well as the results of the obtained data are considered. For the development of composite materials, we used the loams of the Tyuleikenskoye deposit of the Southern Kyrgyzstan and finely ground basalt powder with organic humate. In addition, we added basalt fibers as an additive. When adding 3-10% of basalt powder to the composition of the clay mass, fire shrinkage decreases slightly. In this limit of additives, the mineralizing effect of the chemical elements of basalt powder and humate on the formation of shards is most effective. With a further increase for additives to 15%, there is an insignificant linear thermal expansion of the samples, which is caused by the phase composition of the shard. At the same time, the optimal firing temperature of raw materials with a content of 3-15% of its additive is 950-1050 °C, within which the main processes of structure formation take place. According to the results of the experiment, the maximum strength of the samples at 1000°C was 15.8-18.8 MPa with the addition of 5% additive, and with an increase in basalt powder and fiber to 15%, the strength was 16.3 MPa. Based on the results obtained, it is possible to use basalt powder and basalt fiber with the addition of humate as the main component in the production of composite ceramic products.