Red Mud Waste Research Articles

Effect of Temperature on Mechanical and Chemical Properties of Fired Ceramic Produced from Cathode-Ray Tube (CRT) Waste Glass and Red Mud Bauxite from Ngaoundal (Cameroon)

Effect of Temperature on Mechanical and Chemical Properties of Fired Ceramic Produced from Cathode-Ray Tube (CRT) Waste Glass and Red Mud Bauxite from Ngaoundal (Cameroon)

Acid-treated waste red mud as an efficient catalyst for catalytic fast copyrolysis of lignin and polyproylene and ozone-catalytic conversion of toluene

In this study, red mud (RM), a highly alkaline waste generated from alumina production industries, was used as a catalytic material for both fast copyrolysis of organosolv lignin (OL) and polypropylene (PP) and toluene removal under ozone at room temperature. The RM was pretreated with HCl to investigate the effect of alkalinity. In the catalytic fast copyrolysis of the OL and PP, the acid-treated RM (HRM) produced more aromatics, phenolics, and light olefins (C3 to C5) but less oxygenates and heavy olefins (C6 to C46) than the RM. The difference in pyrolytic performance between the RM and HRM was likely attributed to the concentrated Fe2O3 species in the HRM catalyst. In addition, more efficient toluene removal was observed over MnOx/HRM than over MnOx/RM owing to the large Brunauer–Emmett–Teller surface area, high amounts of Al and Fe, and optimal Mn3+/Mn4+ ratio. This study demonstrates that the RM, an industrial waste, can be reused as an effective catalytic material for not only biofuel production but also pollutant removal.

Dynamic properties and environmental impact of waste red mud-treated loess under adverse conditions

Under the combination of heavy loading and high moisture content, the metastable structure of natural loess can easily lead to uneven settlement and damage the overlying infrastructure. Using traditional binder such as cement has harmful impact on the environment, especially due to resource consumption and carbon emission. This research has identified the feasibility of using red mud waste as a partial replacement of cement for loess subgrade treatment in terms of dynamic properties and environmental impact. The performance of loess treated with a combination of waste red mud (RM) and small amount of cement additive (C) is evaluated by considering the complex engineering geological conditions. The results show that dynamic stress (σd) and moisture content (w) have a more significant influence on the dynamic properties of RMC-treated loess compared with confining pressure (σ3) and loading frequency (f). Higher w shows a remarkable reduction in the dynamic load resistance of treated loess, yet the addition of RMC still can improve the microstructure and water sensitivity of loess. Specifically, the failure dynamic stress (σdf) and the maximum dynamic elastic modulus (Edmax) of the treated loess at higher w are found to be 100% and 400% higher than those of untreated loess respectively. RMC treatment also improved the dynamic cohesive (cd) value from 23.2 to 173.6 kPa compared with untreated loess. In addition, the leaching toxicity and radiation of RMC-treated loess indicate that it does not pose any risk to the groundwater. Finally, revised Monismith model has been developed based on the proposed formula for predicting power index b, which can be capable of describing the long-term deformation stability under cyclic loading.

Concentration of Rare Earth Elements (Sc, Y, La, Ce, Nd, Sm) in Bauxite Residue (Red Mud) Obtained by Water and Alkali Leaching of Bauxite Sintering Dust

One of the potential sources of rare-earth elements (REE) is the industrial waste known as red mud (bauxite residue), in which the majority of REE from the initial bauxite are concentrated via the Bayer process. Therefore, the studies of the subject, both in Russia and outside, focus almost exclusively on red mud processing. This article looks into the possibility of REE concentration into red mud by leaching an intermediate product of the bauxite sintering process at Russian alumina refineries, namely electrostatic precipitator (ESP) dust. The experimental works were performed by X-ray diffraction (XRD)and electron probe microanalysis (EPMA) of the sinter and sinter dust. The determination of major and rare-earth elements in the sinter from the rotary kilns and in the ESP dust before and after leaching was carried out by X-ray fluorescence (XRF) and plasma mass spectrometry (ICP-MS). The study showed that it is possible to obtain red mud that contains three times more REE than traditional waste red mud after two-stage leaching ESP dust in the water at 95 °C followed by leaching in an alkaline-aluminate liquor at 240 °C. The shrinking core model was used to study the kinetics of leaching of the original ESP dust and water-treated dust in alkaline-aluminate liquor. The study showed the change in the limiting stage of the alkaline leaching process after water treatment, with the activation energy growing from 24.98 to 33.19 kJ/mol.

Acid-pretreated red mud for selective catalytic reduction of NOx with NH3: Insights into inhibition mechanism of binders

Recently, we proposed an efficient pretreatment method for waste red mud (RM) to be utilized as an SCR catalyst. However, in terms of the shaping process, RM’s hydraulicity and easily pulverization always cause the loss of surface areas and active species, which limits its application. In this study, we prepared shaped RM catalysts using the sesbania powder (sp), guar gum (gg), and carboxymethylcellulose sodium (cs) to investigate the impact of binders on the RM catalysts. The results exhibited that the RM-15sp-550 showed the highest activity with T90 (the reaction temperature with NOx conversions higher than 90%) active window of 325–450 °C. The gg and cs strongly inhibited the surface reducibility and NH3 adsorption, which was caused by the decrease of the Fe(III), absorbed oxygen, and acid sites (especially the Brönsted acid sites). The reactions between adsorbed ammonia species on the Brönsted acid sites and gaseous NO were restricted on the RM-15gg-500 and RM-15cs-500. Compared with the RM-15gg-500 and RM-15cs-500, the RM-15sp-500 exhibited more accumulated pores. Raman experiments proposed that more oxygen vacancies formed on the RM-15sp-500 and NH3 were selectively chemisorbed on the FeTiO3 during the NH3 presorbing process, which benefited SCR reaction. The strong viscosity at low temperatures and low decompose temperature of the sp minimized its impact on the RM catalyst. This made it an excellent binder for industrial RM catalyst. The cost analysis showed that the price of the RM catalyst was 67% lower than that of commercial V-W-Ti catalyst, and the use of RM catalyst can also alleviate the RM accumulation issue.

Development of Waste Red-Mud Nanoparticle Decorated Laser-Induced Graphene Flexible Sueprcapacitor

Environmental benign, inexpensive, flexible, smart energy storage micro-supercapacitors, with high energy and power densities and long-term cyclic stability are appealing for next generation energy storage devices. Conventionally, highly conducting carbon-based nanomaterials with high-surface areas are extensively used as supercapacitor electrode and the introduction of metal oxides (or conducting polymers) induces pseudocapacitance and can further enhances the specific capacitance and energy density. Red mud (RM), an aluminum industry waste by-product which is a rich source of hematite phase Fe2O3. RM is environmentally hazardous due to its alkalinity and is produced at an annual rate of ~ 110 million tonnes each year, much of which is not well utilized, and left to lie in large lakes; thus, methods of finding value-added applications for RM are well sought after. In this study, we used mechanical milling to produce uniform spherical RM nanoparticles and utilized these in a flexible micro-supercapacitor device. The as-synthesized nanoparticles were decorated over a laser induced porous 3D graphene (LIG) on a polyimide substrate. The composite electrode material was characterized using transmission electron microscopy (TEM), field effect scanning electron microscopy (FESEM), X-ray photo electron spectroscopy (XPS), Raman spectroscopy and cyclic voltammetry (CV). A solid-state ionic liquid based polymer gel electrolyte was produced using a mixture of ionic liquids {[EMI][TFSI] and [EMIM][BF4]} and a PVDF polymer. Inkjet printing technique was employed to produce the silver current collector and the as fabricated inter-digitated micro-supercapacitor device (Figure 1a) exhibited an areal capacitance of 203 mF cm-2 with a higher potential window of 2.7 V, high energy density of 0.018 mW h/cm2 at 0.66 mW/ cm2 power density. RM decoration increased the energy density of the device by 3.7 fold compared with pristine LIG device (Figure 1b). Rapid lateral ion flow in the planar architecture, presence of metal oxides (mostly hematite), higher electrochemically active surface area, better charge transfer kinetics were shown to yield improvements in the energy-density and the electrochemical performance of the device. An in-depth electrochemical study also revealed that the charge storage mechanism was governed by diffusion driven pseudocapacitance. The device exhibited good robustness and could resist bending and flexing and the prototype device exhibited to power a white-light LED (Figure 1c). Overall, this work demonstrates that RM may be used as a low-cost pseudocapacitive element in supercapacitor electrodes and aid in reducing the environmental impact of the aluminium production cycle by recycling this abundant waste product. Figure 1

Red Mud-activated Peroxymonosulfate for Ciprofloxacin Degradation: Efficiency and Mechanism

In this paper, the effects and mechanism of ciprofloxacin (CIP) degradation with peroxymonosulfate (PMS) catalyzed by solid waste red mud (RM) was firstly studied. The results indicated that RM has large specific surface area (10.96 m2·g-1) and complex pore structure, containing ferric, alumina and calcium oxide, which enhanced ciprofloxacin degradation by PMS effectively. Radical quenching experiments revealed that SO4-·and HO·were contributed to ciprofloxacin oxidation, and the reaction was mainly occurred on RM's surface. An increase in temperature could accelerate CIP degradation, and the corresponding reaction activation energy Ea was about 5.74 kJ·mol-1. Meanwhile, CIP degradation rate increased with PMS concentration and the optimal dosage of RM was 1.0 g·L-1. Eight degradation intermediates were identified using HPLC/MS/MS, and consequently, CIP was degraded mainly through two pathways; the piperazine groups were preferentially attacked by active free radicals. This study further indicated that RM is a cheap catalyst and can be potentially used in the treatment of antibiotic contaminated wastewater.

Potential use of smartly engineered red mud nanoparticles for removal of arsenate and pathogens from drinking water

The aluminum industrial waste red mud was successfully utilized as a novel adsorbent for the removal of arsenic (As) ions from water. The arsenate (As (V)) adsorption efficacy of red mud nanoparticles was also investigated. Red mud nanoparticles were prepared by ball milling raw red mud for 10 h, yielding particles’ size of 20 nm on average. The As (V) adsorption on these nanoparticles strongly depended on the size of the nanoparticles. As (V) removal increased from 58 to 83% by reducing the size of red mud particles from 200 to 20 nm. Detail kinetics and transport study confirmed the pseudo-second-order kinetic process which was governed by external mass transport. The Freundlich (and Langmuir) isotherms confirm that the arsenate adsorption capacity changes from 2.28 mg/g (1.84 mg/g) to 2.54 mg/g (1.96 mg/g) for reduction of particles from size 200 nm to 20 nm. Water filter columns made with red mud nanoparticles prepared by ball milling for 10 h showed better filtration performance than the filter packed with raw red mud. Both the hydraulic conductivity and the As (V) removal (8 mm/h and 61% respectively) of influent 1 mg/L As (V) by red mud nanoparticles were greater than the raw red mud (3.2 mm/h and 54%). The modified red mud column filters also exhibited a higher efficiency than the raw red mud filters to remove Escherichia coli and Staphylococcus aureus from the water. Overall, this research shows that nanomaterials derived from aluminum processing waste can be a promising material for water filtration.

Direct processing of cellular ceramics from a single red mud precursor

The feasibility of recycling red mud waste by its direct transformation into highly-porous cellular ceramics was successfully demonstrated. Ceramic materials with designed cellular porosity were processed by emulsification of red mud suspensions with liquid paraffin. Taguchi method was used to study the effects provided by varying the red mud load in the suspension, gelatine content and emulsion stirring time on the micro structural features of the cellular ceramics. Additional experiments analysed the effects of the organic to suspension ratio and firing temperature. Emulsification of paraffin followed by gelatine consolidation, drying, elimination of the droplets of the discontinuous organic phase and firing, allowed one to design cellular ceramic pieces with open porosity up to 75%, consisting in interconnected cells with adjustable cell size and low resistance to percolation. These results allow one to consider prospective applications of red mud-based cellular ceramics with designed microstructures as highly-porous membranes for the capture of pollutants.

Study on stress-strain-resistivity and microscopic mechanism of red mud waste modified by desulphurization gypsum-fly ash under drying-wetting cycles

In order to investigate characteristics of red mud waste modified by desulfurization gypsum-fly ash, an unconfined compressive strength test and a synchronous resistivity test of solidified soil under different contents, curing time and dry-wet cycles were carried out. Moreover, the internal structure change, reaction mechanism, and the hydration characteristics of desulfurization gypsum-fly ash soil were analyzed by XRD and SEM tests. The results show that under the 77% red mud content, the unconfined compressive strength increases with the increase of age. The stress-strain-resistivity curves of the same amount in red mud at different ages are basically consistent with each other. Under different contents, in the first three-stage, stress increases with strain, and the resistivity decreases with increasing strain. In the local deformation stage, the stress decreases rapidly with the increase of strain, and the resistivity keeps decreasing until the specimen is completely destroyed. When the water content is lower, the resistivity is greater. Also, with the increase of number drying-wetting cycles, the strength of the sample mixture is gradually weakened from 1.34 MPa of one drying-wetting cycle to 0.8 MPa of nine drying-wetting cycle. The corresponding resistivity with one drying-wetting cycle continues decreasing slowly about 0.5%, and this trend of decreasing is gradually weakened. When the drying-wetting cycle is more than 5, the resistivity will increase with the increasing of the drying-wetting cycles. The microstructures of red mud waste modified by desulfurization gypsum-fly ash soil were examined by SEM analysis after a different number of dry-wet cycles. The SEM analysis has shown that the sample mixture was initially compacted with homogenous particles, because of the amorphous gel C-S-H and kotoite silicatian which are basically responsible for strength development. With the increases in drying-wetting cycle numbers, there are obvious changes in the characteristics and the structure of the mixture sample, whereas the porosity of the structure of the sample also increases, while the density and the unconfined compressive strength of the structure of the sample decreases. This paper aims to provide an important theoretical application of the comprehensive utilization of red mud as a road base material.

Mechanochemical synthesis of Fe2O3/Zn-Al layered double hydroxide based on red mud

In this work, using industrial waste red mud (RM) as main starting material, a simple method of mechanochemical synthesis (MCS) was introduced as a green approach to synthesize heterogeneous Fe2O3/Zn-Al layered double hydroxide (F/ZA-LDH), which could be used as a new low-cost catalyst for photo-Fenton reaction. The optimum preparation conditions of F/ZA-LDH were as follows: mass ratio of Zn(NO3)2·6H2O to RM (mZn:mRM) 2:1, dry milling time 6 h, H2O dosage 2 mL, ball-to-powder mass ratio 50:1, and milling speed 250 rpm. The effects of the synthesis conditions on the crystal structure and catalytic activity of F/ZA-LDH were analyzed. The F/ZA-LDH was characterized by XRD, TG, XPS, SEM, (HR)TEM. The characterization results showed the composite had a crystallized hydrotalcite-like structure, and the crystalline phases in the optimum F/ZA-LDH were Fe2O3 and Zn-Al LDH. A hetero-interfaces between Fe2O3 and Zn-Al LDH existed in the synthesized Fe2O3/Zn-Al LDH composite. Furthermore, the possible mechanism for F/ZA-LDH formation in the MCS process was proposed. Overall, our results provide a systematic understanding of the preparation of LDH composite through MCS using RM as main material, and our findings help to develop green technology for reusing RM.

Application of biopolymers for improving the strength characteristics of red mud waste

In this study, the usefulness of two biopolymers (guar gum and xanthan gum) in improving the strength properties of two types of red muds was explored. Experiments were performed to determine the unconfined compressive strength and to establish the morphological and mineralogical compositions of stabilised samples cured for 7, 28, 45 and 90 d. The obtained results were interpreted to understand the red mud–biopolymer interactions. Considerable improvement in the compressive strength of stabilised samples, by four to five times, vis-à-vis that of the untreated samples was observed. Based on the results obtained for different admixture contents (i.e. 0·5, 1·0, 2·0 and 3·0%), the optimum dosage of biopolymers was found to be 0·5%. The morphological analysis revealed the formation of gels and their role in the aggregation of particles by the combined action of binding and pore filling. However, no changes in mineralogical compositions were identified from the diffraction patterns of stabilised samples. Both biopolymers proved effective in improving the strength characteristics, but the efficacy of xanthan gum was found to be superior over that of guar gum. Despite extreme alkalinity in the media, biopolymers were still able to impart reasonably good strength to the treated samples, demonstrating their usefulness and applicability.

Recovery of Fe and Al from red mud by a novel fractional precipitation process.

The development of cheap and effective approach for utilizing red mud (RM) waste is a long and arduous task. This work provided a technically and economically feasible route to utilize RM waste for the production of high valuable chemicals by use of the industrial wastes as cheap raw materials. The Fe and Al elements were first leached from RM through hydrothermal reaction and then were separated by precipitation after the Fe(III) in leachate was reduced to Fe(II) by iron powder. Above 90% Fe and Al were extracted from RM with the Fe and Al purity of about 95% and 45%, respectively. The control test revealed that the main impurity of Al product was caused by the adsorbed SO42- during the precipitation of the Al3+. The structural characterization demonstrated that the obtained Fe products were in nanoscale, and the Ti-Si residue has high BET area of 203.7m2/g. Four products of nano-Fe3O4/nano-Fe, aluminum oxide, Ti-Si residue, and (NH4)2SO4 were obtained as valuable chemical materials for industry. This demonstrated utilization of industrial waste to produce high added-value products with high efficiency and low cost will possess promising application prospect for the resource utilization of RM in industry.

Utilization of Bauxite Residue: Recovering Iron Values Using the Iron Nugget Process

ABSTRACT Red mud waste from aluminum processing was utilized as a material for extraction of iron. Red mud contains a high amount of iron, comparable to feedstock to North American iron mines, and extracting this iron value is paramount. The iron nugget process can extract iron from the iron minerals in red mud. The nugget process is a one-step alternative to the blast furnace which simultaneously reduces and separates metallic iron from the red mud. A mixture of powdered hardwood and softwood was used as the reducing agent. Resulting iron nuggets have an iron grade that is comparable to blast furnace pig iron.

Bauxite waste with low Fe 2 O 3 and high Na concentration as a promising oxygen carrier in chemical looping combustion

Development of a cost-effective oxygen carrier (OC) for chemical looping combustion (CLC) technology remains an important task to be accomplished. Bauxite waste red mud from the United States has shown promise as an OC, but bauxite waste from China has not been evaluated extensively although huge quantities of it exists. In comparison, the Chinese bauxite waste usually contains low Fe2O3 and high Na concentration. Hence, the purpose of this study was to evaluate a typical red mud (from Zibo, China) with low Fe2O3/Na mass ratio for its potential as a cost-effective OC during CLC processing. Parametric reactor testing was accomplished with a focus on OC reactivity during CLC, and evaluations were accomplished of morphologies, elemental concentrations, and mechanical strengths before and after reaction testing; special attention was paid to the stability of Na. These results showed that Zibo red mud (a) used as an OC during CLC had satisfactory reactivity particularly after pre-calcination at 1250°C, (b) had high contents of Na that were stable and uniformly distributed during reaction testing and formed NaAlSiO4 during sample calcination and reaction testing, and (c) showed high mechanical strengths that were similar to those of other oxygen carriers. Considering that huge amounts of this inexpensive Zibo red mud are located within areas near aluminum processing plants, it may become a promising material as an OC for CLC processing.

Electrochemical Deposition of Zero-Valent Iron from Alkaline Ceramic Suspensions of Fe2−xAlxO3 for Iron Valorisation

Electrochemical reduction of iron oxides into zero-valent iron (ZVI, Fe0) is a promising alternative to the traditional methods used for iron production. The electrochemical deposition of Fe0 from hematite and hematite-based Fe2−xAlxO3 ceramic in alkaline suspensions (10 M of NaOH) was assessed at relatively low temperature (90 °C). Ceramic compositions aimed to mimic the main components of red mud waste from the alumina refining industry for iron valorisation purposes. The impact of aluminium content on the electroreduction and microstructure of the deposited Fe0 films was demonstrated and discussed. Trapping and following the leaching of the aluminium species during deposition causes drastic morphological changes and induces significant porosity. Faradaic efficiencies of the reduction to Fe0 were found to decrease from 70% to 32% for Fe2O3 and Fe1.4Al0.6O3, respectively. The results highlight possible effects imposed by aluminium presence during Fe0 electrodeposition for future iron recycling from, for example, red mud or other aluminium containing wastes by electrowinning in alkaline conditions.

Experimental and statistical analysis of As(III) adsorption from contaminated water using activated red mud doped calcium-alginate beads

ABSTRACT Arsenic present in water bodies causes devastating effects on aquatic organisms and indirectly poses a hazardous threat to human existence. There is an urgent need to develop potential and convincing technologies to troubleshoot this problem. In the present study, an adsorbent has been prepared using the waste red mud from hazardous aluminium industry and doping it with calcium-alginate beads (ARMCB) for the effective removal of As(III) from wastewater. The concentration of As(III) was reduced from 0.101 mg/L to 0.008 mg/L after adsorption which effectively met the economic and environmental conditions imposed by WHO (>0.01 mg/L). Further, the statistical Response Surface Methodology (RSM) is adopted to analyze the combined effects of four operational parameters namely: pH, sorbent dosage, contact time and initial concentration on the adsorption of As(III) from the synthetic contaminated water samples. A high correlation coefficient (R2) value of 0.9672 projected by ANOVA confirmed the satisfactory regression of the developed model. The maximum adsorption capacity is found to be 1.807 mg/g at optimum operating conditions. The surface characterization of the adsorbent before and after adsorption by SEM, EDX, XRD, and FTIR confirms the potentiality of the adsorbent towards As(III) ions. Thermodynamic, adsorption isotherms and kinetic analysis respectively projected the endothermic Langmuir model adsorption of As(III) and the pseudo-second-order rate kinetics of the sorption mechanism. The current study aids the implementation of the developed robust technique for the successful removal of As(III) from industrial and domestic polluted water samples.

The utilization of red mud waste as industrial honeycomb catalyst for selective catalytic reduction of NO.

As a new way for the high-value utilization of red mud (RM) waste, we proposed an improved approach to prepare the RM-based sludge/powder via the sulfuric acid hydrothermal dissolution and NH3 aqueous precipitation route and then the RM-based industrial-sized honeycomb (150 × 150 × 600 mm) was successfully produced by the extrusion moulding method in pilot scale. The synthesized RM-based powdery/honeycomb catalyst exhibited more than 80% deNOx activity and good durability of H2O and SO2 above 350°C. But the decline of NO conversion was also observed above 350°C, which was confirmed to result from the increased oxygenation of NH3 at high temperature. To improve the NO conversion at high temperature, NH3 was shunted and injected into the catalyst bed at two different places (entrance and centre) to facilitate its uniform distribution, which relieved the oxidation of NH3 and increased deNOx efficiency with 98% NO conversion at 400°C. This work explored the industrial application feasibility for the RM-based honeycomb catalyst as well as the possible solution to decrease the oxygenation of NH3 at high temperature, which presented a valuable reference for the further pilot tests of RM catalyst in industry.

Mechanistic insights into red mud, blast furnace slag, or metakaolin-assisted stabilization/solidification of arsenic-contaminated sediment

Elevated level of arsenic (As) in marine sediment via deposition and accumulation presents long-term ecological risks. This study proposed a sustainable stabilization/solidification (S/S) of As-contaminated sediment via novel valorization of red mud waste, blast furnace slag and calcined clay mineral, which were selected to mitigate the increased leaching of As under alkaline environment of S/S treatment. Quantitative X-ray diffraction and thermogravimetric analyses illustrated that stable Ca-As complexes (e.g., Ca5(AsO4)3OH) could be formed at the expense of Ca(OH)2 consumption, which inevitably hindered the hydration process and S/S efficiency. The 29Si nuclear magnetic resonance analysis revealed that incorporation of metakaolin for As immobilization resulted in a low degree of hydration and polymerization, whereas addition of red mud promoted Fe-As complexation and demonstrated excellent compatibility with As. Transmission electron microscopy and elemental mapping further confirmed the precipitation of crystalline Ca-As and amorphous Fe-As compounds. Therefore, red mud-incorporated S/S binder achieved the highest efficiency of As immobilization (99.9%), which proved to be applicable for both in-situ and ex-situ S/S of As-contaminated sediment. These results advance our mechanistic understanding for the design of green and sustainable remediation approach for effective As immobilization.

Environmentally clean construction materials from hazardous bauxite waste red mud and spent foundry sand

This paper demonstrates the possibility of producing new red ceramics composites from red mud of hazardous bauxite waste (50–100 wt%), and foundry sand (10–50%) replacing the traditional clay-sand mix and preventing the environment pollution by such industrial wastes. The newly developed environment-friendly ceramics exhibit high physical properties (flexural strength, linear shrinkage, water absorption, and density). The ceramics’ analysis by X-rays fluorescence, X-rays diffractometry, atom absorption spectroscopy, scanning electron microscopy, energy-dispersion spectroscopy, and laser micro-mass analysis revealed the synthesis of mainly glass-like structures with a small inclusion of crystalline structures. The values of flexural strength reached 10.54 MPa; after sintering at 1150 °C, linear shrinkage varied between 6.62 and 7.92%, water absorption – 2.77 and 14.41% and bulk density – 1.65 and 2.07 g/cm3. The most valuable property of the developed materials is the ecological purity due to the heavy metal’s complete neutralization from both industrial wastes.