208 results about "Bauxite" patented technology

The invention belongs to the technical field of motor casing lost foam casting, and particularly relates to a special coating for a motor casing lost foam as well as a preparation method and application thereof. Through a quantitative formula design method, an aggregate proportion calculation formula based on thermal expansion coefficient matching and a grain size distribution correlation formula based on target air permeability, cooperative compounding of quartz powder and bauxite is achieved, and key functional components such as mullite, organic matter fibers and crystalline flake graphite are combined; the unification of high air permeability and excellent crack resistance of the motor shell lost foam coating is realized. The invention further provides a two-time coating gradient drying efficient process matched with the coating, and on the premise that the coating performance is guaranteed, the production efficiency is remarkably improved, and the energy consumption is reduced.

Ultrafast flash evaporation joule heating synthesis methods and systems, more particularly, ultrafast synthesis methods for recovering metals from ores, fly ash, and bauxite residue (red mud).

The invention provides a ceramsite proppant as well as a preparation method and application thereof. The method comprises the following steps: grinding a coal gangue raw material, pre-sintering, cooling and then grinding again; grinding the tungsten tailing sand, the low-grade bauxite, the carbide slag and the clay; grinding after mixing the raw materials; the raw materials comprise 45-60 parts of low-grade bauxite, 20-35 parts of pre-sintered coal gangue, 15-20 parts of tungsten tailing sand, 1-5 parts of carbide slag and 7-14 parts of clay; the total amount of the low-grade bauxite, the pre-sintered coal gangue and the tungsten tailing sand is 100 parts; granulating and drying; carrying out first sintering at 800-950 DEG C; second sintering is conducted at the temperature of 1050-1200 DEG C; and naturally cooling to obtain the ceramsite proppant. The technical problem to be solved is how to realize high-valued utilization of mine solid waste and low-grade bauxite, reduce dependence on high-quality bauxite and production cost, reduce sintering energy consumption and carbon emission, reduce product body density and improve key performance such as strength and sphericity of the proppant by optimizing raw material combination and a preparation process. And the requirements of oil and gas field fracturing operation are met.

The invention discloses an X-ray fluorescence spectrum detection method and system for bauxite, a medium and a product, and relates to the technical field of bauxite detection. According to the method, firstly, fluorescence spectrum data of a sample to be detected and mining area environment fingerprint data are obtained, and the initial concentration is determined through background noise stripping; then constructing a mineral phase interference network, calculating an interface radiation attenuation rate and a secondary fluorescence excitation probability based on mineral phase characteristics, and generating an interphase coupling interference matrix; constructing a stress field model according to environmental parameters, and correcting an interference matrix by using a lattice distortion coefficient; and inputting the symbiotic mineral phase combination into the environment adaptive interference model, and determining a nonlinear matrix effect deviation value. And finally, carrying out iterative compensation correction until the difference between adjacent correction values is smaller than a threshold value, and outputting accurate grade data of the target metal element. By implementing the technical scheme provided by the invention, the accuracy of X-ray fluorescence spectrum detection of bauxite can be improved.

The invention provides a method for preparing aluminum oxide and extracting lithium from lithium-rich bauxite waste rocks, and belongs to the technical field of solid waste comprehensive utilization. The method comprises the following steps: crushing and grinding the lithium-rich bauxite waste rocks, mixing with an acid mixed solution, leaching to remove iron to obtain a low-iron filter cake, adding concentrated sulfuric acid, roasting, curing, leaching with water, carrying out hot filtration to obtain a filtrate, adding a crystallizing agent, dissolving, evaporating to obtain a steel belt crystallizer crystal, stirring and washing a saturated solution to obtain a lithium-containing solution and low-iron aluminum ammonium sulfate, purifying the lithium-containing solution to remove impurities, and precipitating lithium with sodium carbonate to prepare lithium carbonate; and calcining the low-iron ammonium aluminum sulfate to prepare aluminum oxide. The method provided by the invention has the advantages of simple process, low energy consumption in roasting and leaching of aluminum and lithium, high recovery rate of valuable components of aluminum and lithium, high iron removal rate, high separation efficiency of aluminum and lithium, low extraction cost of aluminum and lithium, recyclability of the crystallizing agent and the like, is easy for industrial implementation, and greatly improves the comprehensive utilization value of the lithium-rich bauxite waste rocks.

This invention discloses a lightweight, high-strength ceramsite proppant based on composite coating and low-temperature densification, and its preparation method. The coated proppant includes a ceramsite proppant and a coating layer covering the surface of the ceramsite proppant. It relates to the field of fracturing technology in oil and gas engineering. The ceramsite proppant includes bauxite, perlite, a composite sintering aid, B2O3, and AlF3; the composite sintering aid includes MnO2 and TiO2; wherein the weight ratio of bauxite, perlite, composite sintering aid, B2O3, and AlF3 is 80:20:2.5-7.5:3-12:3-12. This invention uses a low-grade bauxite and high-silica raw material system, combined with the introduction of an appropriate amount of sintering aid, effectively reducing the sintering temperature and energy consumption; simultaneously reducing the bulk density of the ceramsite proppant, resulting in a lightweight product.

This invention relates to a method, system, medium, and product for X-ray fluorescence spectrometry detection of bauxite, belonging to the field of bauxite detection technology. The method first acquires fluorescence spectral data and mining area environmental fingerprint data of the sample to be tested, and determines the initial concentration by background noise stripping. Then, a mineral phase interference network is constructed, and the interfacial radiation attenuation rate and secondary fluorescence excitation probability are calculated based on mineral phase characteristics to generate an interphase coupling interference matrix. Next, a stress field model is constructed based on environmental parameters, and the interference matrix is ​​corrected using the lattice distortion coefficient. The coexisting mineral phase combination is input into the environmental adaptive interference model to determine the nonlinear matrix effect deviation value. Finally, iterative compensation correction is performed until the difference between adjacent correction values ​​is less than a threshold, outputting accurate grade data of the target metal element. Implementing the technical solution provided in this application can improve the accuracy of X-ray fluorescence spectrometry detection of bauxite.

The utility model relates to a bauxite detecting and sampling device which comprises a connecting rod, a positioning disc, a pulley, a guide shaft, a connecting line, a long sliding nail and a second spring, the connecting rod is a hollow shaft and connected to the bottom of the sampling barrel, the bearing plate is slidably connected to the connecting rod, the positioning disc is fixedly arranged on the lower portion of the connecting rod, the pulley is rotatably arranged at one end of the positioning disc, the guide shaft is arranged in the connecting rod, and the long sliding nail is slidably connected to the top of the sampling barrel. A second spring is arranged at the top of the long sliding nail and abuts against the top of the sampling barrel, and the connecting line is connected to the bottom of the long sliding nail, penetrates through the guide shaft and the pulley and then is connected with the bottom of the bearing plate; and the situation that when a position with high hardness is encountered under different working conditions, sampling vibration is large, and false alarms are likely to be generated can be avoided.

The invention discloses a special evanescent mode casting coating for castings and a preparation method thereof, and relates to the technical field of evanescent mode casting paints.The special evanescent mode casting coating for the castings is prepared from 80-86 parts of refractory aggregate, 5-7 parts of bio-based composite binder, 2.5-4 parts of composite suspension, 0.4-0.6 part of dispersing aid and 0.3-0.4 part of coupling agent. 6 to 12 parts of deionized water; the invention discloses a preparation method of a special lost foam casting coating for castings. The method comprises the following steps: S1, premixing dry materials; s2, preparing a liquid phase; s3, mixing and dispersing; s4, performing vacuum defoaming; s5, ultrasonic treatment; and S6, quality detection. According to the lost foam casting coating special for the casting and the preparation method of the lost foam casting coating, in the preparation process, bauxite, quartz powder and bauxite are matched according to the proportion of 9: 1 and then graded in a gradient mode according to the proportion of 3: 5: 2, the coating forms a double-layer structure with a compact surface layer and a porous inner layer through gradient grading, the surface layer is resistant to sand burning and molten metal scouring, and the inner layer rapidly exhausts steam; therefore, the requirements of sand adhesion prevention, ventilation and steam exhaust are met.

Dispersible activated bauxite granules are disclosed and methods for forming dispersible activated bauxite granules are disclosed in which bauxite is activated by a granulation process.

This invention discloses a high-strength ceramic valley-peak structured corrugated filler, the raw materials of which include clay, kaolin, potassium feldspar powder, cordierite powder, zirconium dioxide powder, reinforcing granular powder, bauxite, and a binder. The corrugated filler material prepared by the method described in this invention has good strength, making it less prone to breakage during stacking or use, thus improving the usability and durability of the corrugated filler.

The invention relates to the technical field of refractory materials, in particular to an impervious heat-insulation refractory castable for an aluminum melting furnace and a preparation method of the impervious heat-insulation refractory castable. The refractory material comprises the following components in parts by weight: 20-30 parts of bauxite, 30-40 parts of corundum powder, 6-8 parts of zirconium oxide, 8-12 parts of modified graphite powder, 10-15 parts of silica powder, 3-6 parts of a binding agent and 1-5 parts of a water reducing agent. According to the refractory castable disclosed by the invention, the bauxite and the corundum powder are used as aggregates, so that the erosion of aluminum slag can be effectively avoided, and meanwhile, the wetting angle between the refractory castable and molten aluminum can be increased by adding the modified graphite powder, so that the refractory castable has good erosion resistance and heat insulation performance.

The utility model discloses an industrial waste residue composite cementing material preparation system which comprises a first calcining furnace, a kaolin feeding hole and a bauxite feeding hole are formed in the first calcining furnace, the first calcining furnace is connected with a first mixing kettle, and a coal ash feeding hole and a 10% sodium hydroxide solution feeding hole are formed in the first mixing kettle; the outlet end of the second calcining furnace is connected with the inlet end of the dehydrating tower, the outlet end of the dehydrating tower is connected with the inlet end of the second calcining furnace, the second calcining furnace is provided with a sodium dihydrogen phosphate feed port and a urea feed port, and the second calcining furnace is connected with the second mixing kettle; the second mixing kettle is provided with a red mud feeding hole, a coal gangue feeding hole, a metallurgical slag feeding hole and a glass water feeding hole; and the second mixing kettle is sequentially connected with the air furnace, the grinding kettle and the finished product bin. According to the utility model, the stockpiling of industrial solid wastes can be reduced, the environmental pollution can be effectively reduced, and the problem of infrastructure material shortage can be effectively relieved on the premise of ensuring the engineering quality.

The application relates to the technical field of special functional coating materials for lost foam casting, and particularly discloses a cast iron lost foam and universal coating for full mold casting and application thereof. The cast iron lost foam and universal coating for full mold casting comprises quartz powder, calcined bauxite, modified fly ash microbeads, microcrystalline graphite and an additive; the modified fly ash microbeads comprise fly ash and a composite coating layer coated on the surface of the fly ash, and the composite coating layer comprises aluminum oxide nanosheets and magnesium ion doped amorphous substances. Through functional design of key components, the coating can dynamically adjust its performance according to the temperature and chemical environment of the contact interface, can meet the high air permeability requirement of the lost foam process, can take into account the differentiated requirements of different cast iron materials on high-temperature strength, permeability resistance and interface purity, and can be compatible with both conventional negative pressure and non-negative pressure conditions, so that the universal coating is realized, and production management and supply chain processes are greatly simplified.

The application provides a fast-hardening early-strength high-pressure and freeze-resistant cement material and a preparation method thereof, belongs to the technical field of cement materials, and the cement material comprises silicate cement clinker, natural anhydrous gypsum, calcined kaolin, calcined quartz powder, a silicon-aluminum-titanium composite mineralized early-strength freeze-resistant agent, a crystal bridge-pore dual functional agent and the like. The silicon-aluminum-titanium composite mineralized early-strength freeze-resistant agent is prepared by sintering, quenching and heat reaction of bauxite, silica fume, titanium dioxide, anhydrous calcium chloride and trisodium citrate, and surface modification by KH-550. The crystal bridge-pore dual functional agent comprises a calcium silicate hydrate crystal bridge agent and a polymer-SiO2 composite elastic pore forming agent. The polymer-SiO2 composite elastic pore forming agent is prepared by shearing emulsification of an oil phase prepared from styrene, butyl acrylate, divinylbenzene and polyglyceryl-10 diisostearate and an aqueous phase prepared from deionized water, sodium dodecyl sulfate and polyethylene glycol allyl methyl ether, ammonium persulfate reaction and tetraethyl orthosilicate reaction.

A method for treating a high-iron bauxite is disclosed. The method includes: subjecting a high-iron bauxite to a selective crushing treatment and a classification treatment to respectively obtain a coarse-fraction bauxite and a fine-fraction bauxite; subjecting the coarse-fraction bauxite to a first gravity separation and impurity removal treatment and a second gravity separation and impurity removal treatment to respectively obtain a gravity-separated concentrate, a gravity-separated middling, and a gravity-separated tailing; subjecting the gravity-separated concentrate to a grinding treatment and a magnetic separation treatment to respectively obtain a magnetically separated concentrate and a magnetically separated tailing; subjecting the fine-fraction bauxite to an impurity removal treatment by centrifugal separation to respectively obtain a centrifuged concentrate and a centrifuged tailing; mixing the gravity-separated middling, the magnetically separated tailing, and the centrifuged concentrate to obtain a product concentrate; and mixing the gravity-separated tailing and the centrifuged tailing to obtain a product tailing.

This utility model relates to the technical field of ore crushing, and in particular to a bauxite crushing device, including a crushing assembly. The crushing assembly includes a crushing box; a discharge hopper fixedly connected to the bottom of the crushing box; support legs disposed at the bottom of the discharge hopper; and a discharge valve fixedly connected to the discharge port of the discharge hopper. A feed hopper is provided at the top of the crushing assembly, and a vibrating screen assembly is provided at the top of the feed hopper. The vibrating screen assembly includes a vibrating screen. Bauxite is conveyed to the vibrating screen assembly via a feed conveyor belt. The vibrating screen assembly uses a vibrating screen and a vibrator to achieve particle size classification before feeding. Oversized materials are automatically separated by a discharge conveyor belt to ensure that the feed particle size is ≤220mm. Excessively large bauxite is discharged through the discharge conveyor belt, thus achieving particle size classification and preventing larger particles of bauxite from entering the crushing device, reducing the risk of equipment overload.

The invention discloses an aluminum oxide proppant and a preparation process thereof, and belongs to the technical field of ceramic fillers. The aluminum oxide proppant is prepared from the following raw materials in parts by mass: 55-72 parts of bauxite; 15 to 25 parts of calcined kaolin; 5 to 10 parts of potassium feldspar; 0.3 to 0.9 part of manganese dioxide; 0.1 to 0.4 part of titanium dioxide; 4-8 parts of a reinforcing agent; the reinforcing agent is formed by mixing co-fired zirconium-based premixed powder and carbonate. The preparation method comprises the following steps: performing conventional wet-process ball-milling to form slurry, performing spray granulation, rolling and forming, performing segmented firing and granulating. According to the scheme, a stable secondary phase is generated in situ between aluminum oxide frameworks in the sintering process, stable zirconium dispersion distribution is achieved, densification and grain boundary stabilization are achieved with low addition amount, the breakage rate under the specified pressure grade is reduced, the acid dissolution rate under the mixed acid condition is reduced, and the product granularity and sphericity are stable.

The application provides a non-calcined phosphogypsum foam light aggregate and a preparation method thereof, and belongs to the light aggregate field.The non-calcined phosphogypsum foam light aggregate provided by the application takes modified phosphogypsum, mineral powder, cement clinker, bauxite, silica fume, kaolin and a foaming agent as the preparation raw materials of the foam inner core, takes phosphogypsum, fast-hard high-iron sulfoaluminate cement and building glue powder and water as the preparation raw materials of the fast-hard cementitious material shell layer, and the obtained non-calcined phosphogypsum foam light aggregate with a core-shell structure has a bulk density of <800 kg / m 3 The non-calcined phosphogypsum foam light aggregate has a small bulk density, and the fast-hard cementitious material shell layer improves the strength of the non-calcined phosphogypsum foam light aggregate, so that the non-calcined phosphogypsum foam light aggregate has a good application prospect in the ultra-light concrete field; the foam inner core and the fast-hard cementitious material shell layer are self-assembled into a core-shell structure, so that the pollutants are quickly encapsulated in the inner core by the shell layer material with good compactness, the leaching toxicity of the non-calcined phosphogypsum foam light aggregate is reduced, and the environmental protection performance is excellent.

This application relates to the field of bauxite beneficiation technology, and more particularly to a dry beneficiation method for high-iron bauxite. High-iron bauxite includes iron minerals and aluminum minerals. The dry beneficiation method includes: sequentially crushing and classifying the high-iron bauxite to obtain coarse-grained raw ore, intermediate-grained raw ore, and fine-grained raw ore; dry gravity separation of the coarse-grained raw ore to obtain a first aluminum mineral and a first iron mineral; photoelectric separation of the intermediate-grained raw ore to obtain a second aluminum mineral and a second iron mineral; dry magnetic separation of the fine-grained raw ore to obtain a third aluminum mineral and a third iron mineral; merging the first, second, and third aluminum minerals to obtain aluminum concentrate; merging the first, second, and third iron minerals to obtain iron mineral crude; and finely cleaning the iron mineral crude to obtain iron concentrate product. This dry beneficiation method improves the separation effect of aluminum and iron minerals in high-iron bauxite by differentiating the raw ore of different particle sizes and using a synergistic all-dry process.

The utility model discloses a high -efficient mixing tank for bauxite flotation, including tank body, the one side lower part of tank body is equipped with the feed port, and the upper part of the other side is equipped with the discharge gate, and the top of tank body is provided with crossbeam, and the top of crossbeam is provided with motor, and motor is connected with belt pulley, be provided with the stirring barrel in the tank body, the top and bottom of stirring barrel all are linked with tank body, and the transmission shaft is set up in stirring barrel and is connected with the stirring vane, and the other end passes through crossbeam and is connected with belt pulley, the upper part of the one side of the feed port of tank body is provided with the feed pipe, and the discharge end of feed pipe is set up on the top of stirring barrel. The utility model discloses adopt the stirring barrel that top and bottom all are linked with tank body, and the feed of stirring barrel top and bottom is simultaneously, and the transmission shaft rotates in stirring barrel, and the ore pulp in the barrel is discharged from the top and bottom of stirring barrel to the tank body, and the ore pulp in the tank body forms the upflow, and finally discharges from the discharge gate, can effectively promote the stirring efficiency.

The invention discloses a solar molten salt furnace refractory brick capable of resisting thermal shock and a preparation method of the solar molten salt furnace refractory brick capable of resisting thermal shock and the preparation method of the solar molten salt furnace refractory brick. 3 to 5 percent of alpha-Al2O3 micro powder; 8 to 12% of kaolinite; 7-9% of high alumina bauxite; 4-6% of modified fluorite tailing ceramsite; 1-3% of a binding agent; 2.5-3% of refractory mortar; 5-10% of a regenerated bamboo fiber skeleton; mullite: the balance; the combined action of the modified fluorite tailing ceramsite and the regenerated bamboo fiber skeleton effectively improves the cold and heat shock resistance and high temperature molten salt erosion resistance of the brick body, and optimizes the performance of the brick body.

The invention discloses a method for recovering valuable elements in liquid obtained after bauxite wet desulphurization, and relates to the technical field of bauxite resource utilization. Comprising the following steps: carrying out ceramic membrane filtration pretreatment on the bauxite wet desulfurization liquid to remove impurities; the silicon element is recycled in a targeted manner through a compound flocculation-calcination process to obtain the white carbon black; the iron element is recycled through ozone oxidation-ammonium bicarbonate precipitation, and high-purity iron oxide is prepared; separating and purifying an aluminum element through a seed crystal induction-calcination process to obtain metallurgical-grade aluminum oxide; a fluorine-containing precipitant is used for selectively precipitating and recovering magnesium element to obtain a high-quality magnesium salt product; and neutralizing the tail liquid, and discharging after reaching the standard. According to the method, accurate separation and high-valued utilization of four elements of aluminum, iron, silicon and magnesium are realized through a synergistic process of targeted recovery of silicon, gradient separation of iron and aluminum and selective precipitation of magnesium, and the problems of silicon resource waste, low element separation efficiency, insufficient product purity, secondary pollution and the like in a traditional process are thoroughly solved; all-component resource comprehensive utilization of desulfurized liquid resources is achieved.

The invention belongs to the field of building materials, discloses a high-temperature calcined-activated slag cement base material as well as a preparation method and application thereof, and aims to solve the technical problems of poor slag activation effect, high cement carbon emission and insufficient performance in the prior art. The high-temperature calcined-activated slag cement is prepared from the following raw materials in parts by mass: 40 to 80 parts of cement clinker, 15 to 45 parts of high-temperature calcined activated slag and 0 to 5 parts of gypsum, wherein the raw material of the high-temperature calcined activated slag is bauxite desiliconized tailings. According to the slag cement prepared by calcining and activating the slag, the use intensity of the slag cement is guaranteed while the use amount of the cement clinker is reduced. According to the method, resource utilization of the slag is achieved, solid waste stockpiling pollution is reduced, and compared with traditional clinker, the method is low in calcination temperature and energy consumption, simple in preparation process step and easy for industrial production.

The invention provides a refined aluminum sulfate impurity removing device which comprises a dissolving assembly, a collecting assembly, an impurity removing assembly and a filtering assembly, the dissolving assembly comprises a dissolving tank, an aluminum sulfate adding assembly and a water injection assembly are arranged on the dissolving tank, and the collecting assembly comprises a collecting box installed at the bottom of the dissolving tank; the dissolving tank is communicated with an inner cavity of the collecting box, and the impurity removing assembly comprises a reaction tank. According to the impurity removal device for refined aluminum sulfate, bauxite slag is separated by utilizing the characteristic that aluminum sulfate is easily dissolved in water, and the solution enters from the bottom and exits from the top in the process, so that the bauxite slag is naturally settled, and the blockage problem caused by filtration is avoided; and then ferric salt oxide in the aluminum sulfate solution is removed in a filtering manner, and impurities filtered out at the filter screen can be cleaned in the filtering process, so that the impurities are prevented from gathering and blocking to influence filtering, and refining treatment of aluminum sulfate is facilitated.

The application relates to the technical field of refractory materials, and particularly discloses a hercynite-mullite solid solution raw material and a preparation method thereof. The preparation method of the hercynite-mullite solid solution raw material comprises the following steps: after low-grade high-iron bauxite is crushed and homogenized, the low-grade high-iron bauxite is subjected to a flotation desilication treatment; the ore slurry after the flotation is subjected to a magnetic separation and iron removal treatment, so that the content of Fe2O3 in the ore slurry is controlled to be below 9 wt%; a carbon source is introduced into the ore slurry after the magnetic separation and iron removal, the ore slurry is uniformly mixed, and then the ore slurry is subjected to drying, shaping and sintering in a carbon-embedded atmosphere, and the hercynite-mullite solid solution raw material is obtained. The application realizes high-value and high-quality utilization of the low-grade high-iron bauxite. Through the flotation desilication and magnetic separation and iron removal processes, the contents of SiO2 and Fe2O3 in the raw material are effectively controlled, the low-grade ore which is originally difficult to be directly utilized is converted into qualified refractory material raw material, and the resource utilization efficiency and economic value are greatly improved.

The application discloses a method for directly reducing, electrically smelting and magnetically separating and recovering iron and aluminum from high-iron bauxite, and belongs to the technical field of ore smelting. The method comprises the following steps: (1) crushing and finely grinding high-iron bauxite and reduction coal and uniformly mixing the high-iron bauxite and the reduction coal; (2) directly reducing in a pipe furnace to obtain reduced ore; (3) weakly magnetically separating the reduced ore to screen out aluminum concentrate and iron concentrate, and spreading a layer of reduction coal powder on the surface of the iron concentrate; (4) strongly magnetically separating the aluminum concentrate to screen out high-quality bauxite and iron-aluminum spinel; (5) uniformly mixing the high-quality bauxite and the iron concentrate with the layer of reduction coal powder and feeding the mixture into an electric arc furnace for smelting, and taking out a copper pot for cooling after the smelting is completed; and (6) breaking and magnetically separating after the copper pot is naturally cooled to obtain ferrosilicon alloy and high-purity aluminum oxide. The method can effectively recover iron and aluminum in high-iron bauxite.

The invention discloses a method for further high-temperature dissolution and iron separation of red mud after low-temperature dissolution and iron separation of guinea ore, relates to the technical field of aluminum oxide production, and solves the problems of serious resource waste, high environmental pollution risk, high treatment cost, low valuable metal recovery rate and the like existing in treatment of the red mud after low-temperature dissolution and iron separation of guinea ore at present. The method comprises the following steps that red mud obtained after low-temperature dissolution and iron separation, seed precipitation mother liquor, primary washing liquor and lime are fed into a blending tank to be blended and mixed, the obtained mixed material is fed into a high-temperature dissolution sleeve to be subjected to high-temperature dissolution, ore pulp obtained after high-temperature dissolution is treated through a separation tank and a washing tank, aluminum is recycled from overflow materials, and iron is recycled from underflow through secondary iron separation. According to the method, valuable metals such as aluminum, iron and gallium in the red mud can be efficiently extracted, the comprehensive utilization rate of bauxite resources is remarkably increased, the comprehensive cost of aluminum oxide production is effectively reduced, the total discharge amount of solid wastes is reduced, and the method has a good industrial application prospect.

This invention relates to the field of mining engineering technology, specifically to an environmentally friendly desliming process for bauxite beneficiation, comprising the following steps: raw ore washing and desliming, fine mud concentration and water separation, slurry filtration and wastewater return, and clean water replenishment and system circulation. During operation, the fine mud-containing slurry in the collection tank below the desliming screen is pumped to the concentration equipment. During the operation of the concentration equipment, the slurry slowly diffuses and settles within the equipment, while the fine mud particles settle downwards under gravity, forming concentrated slurry. Clear water is formed at the top and flows back into the clean water tank for recycling. During the operation of the filter press, the wastewater generated by filtration also flows into its matching collection tank. Through a return pipeline and a quantitative conveying pump, this portion of wastewater is quantitatively and continuously transported to the desliming screen collection tank in step S1. The return flow rate matches the slurry flow rate in the desliming screen collection tank, achieving internal circulation of wastewater within the system and avoiding water waste and a significant increase in load during subsequent treatment.

The present application relates to the technical field of refractory materials, in particular to a preparation method of high anti-permeability phosphate bonded silicon carbide refractory brick. The raw materials of the preparation method include high bauxite clinker, silicon carbide aggregate, zirconia micropowder, graphene, aluminum dihydrogen phosphate solution, magnesium-aluminum complex powder, clay and silicon dioxide micropowder. The preparation steps are as follows: after the silicon carbide aggregate is dried after removing iron by hydrochloric acid, the aggregate is co-milled with the pre-dried high bauxite clinker, zirconia micropowder and graphene to obtain powder A; after the aggregate is wet-milled with part of the aluminum dihydrogen phosphate solution and water, powder A, clay and silicon dioxide micropowder are added for further mixing and milling, and the remaining aluminum dihydrogen phosphate and magnesium-aluminum complex are added to obtain plastic mud; the mud is formed by high-pressure molding, dried in two stages, and fired at gradient temperature in a weak reducing atmosphere. The method significantly improves the anti-permeability of the refractory brick, and realizes the microporization of the pores of the refractory brick and the high anti-permeability effect through the synergistic effect of composite bonding phase, gradient firing and physical barrier.