508 results about "Bauxite" patented technology

An LIBS-based bauxite component quantitative detection method and a related apparatus. The method comprises: controlling an LIBS system to collect actual spectral data of bauxite under test; preprocessing the actual spectral data to obtain preprocessed actual spectral data; on the basis of the preprocessed actual spectral data, extracting corresponding feature elements to be detected, said feature elements comprising one or more of information about feature wavelengths to be detected, information about element wavelengths to be detected, and information about remaining wavelengths to be detected; and, on the basis of said feature elements and a quantitative detection model, determining component information of said bauxite.

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.

The invention provides a concrete composite expanding agent and a preparation method thereof, and belongs to the field of concrete admixtures. The concrete composite expanding agent comprises modified phosphogypsum, fly ash, bauxite, a modified oxide and an auxiliary agent, and is obtained by uniformly mixing the modified phosphogypsum, the fly ash, the bauxite, the modified oxide and the auxiliary agent which have different specific surface areas. According to the composite expanding agent, the modified ardealite and the fly ash synergistically provide an early-stage expansion source, early-stage shrinkage of concrete is compensated through calcium sulphoaluminate hydration products, meanwhile, modified magnesium oxide serves as a later-stage expansion source, magnesium hydroxide is generated through slow hydration, and long-term expansion compensation is achieved; the device has the advantages of good strength, compensation capability and the like; a large amount of industrial waste residues such as ardealite and fly ash are utilized, high-added-value utilization of the industrial waste residues is achieved, and remarkable economic benefits are achieved.

The invention discloses a honeycomb ceramic and a preparation method thereof.A composite additive is added into a mixed ceramic raw material, the weight ratio of the mixed ceramic raw material to the composite additive is (30-50): (50-70), and the composite additive comprises 30-54 parts of flaky aluminum oxide, 2-10 parts of nano zinc oxide and 1-5 parts of metal molybdenum particles; the preparation method comprises the steps of ball milling, kneading, refining, extrusion forming, drying and sintering. According to the invention, the raw material formula is optimized, and bauxite is replaced by flaky alumina; beneficial additives, namely nano zinc oxide and metal molybdenum particles, are doped; an original extrusion molding device is used for achieving a layered structure of flaky aluminum oxide, and therefore the shell-imitating pearl layer structure with the layered aluminum oxide as bricks, the metal molybdenum particles as mud and the zinc-aluminum spinel particles as protrusions is built.

The invention discloses a false-inclined multi-layer strip mining method for gentle-inclined medium-thickness underground sedimentary bauxite. The method is particularly suitable for safe and efficient mining of gentle-inclined medium-thickness bauxite with an unstable top plate. An in-vein middle-section transportation roadway is arranged in an ore body to divide the ore body into different middle sections, top and bottom columns are reserved between the middle sections, mining areas are divided in the middle sections in the moving direction of the ore body, columns are reserved between the mining areas, a mining area slope ramp, a lower layered ore loading gate way, a segmented transportation gate way, a layered connection way and an upper layered cutting gate way are respectively tunneled, and strips of two specifications are arranged; the arranged mining areas, ore blocks, mining area ramps, strips and studs are all arranged in a pseudo-inclined mode, the stoping operation is divided into two steps for layered stoping, the strips of 3-5 m are firstly stoped, the strips of 6-8 m are then stoped, according to the stoping sequence that the lower layer is firstly stoped and then the upper layer is stoped, and filling is conducted in time after each layer is stoped. The method is in-vein engineering and has the advantages of being small in mining and cutting engineering amount, good in safety and economical efficiency, high in recovery efficiency and the like.

The invention discloses an extraction method for extracting gallium from waste residues of coal gangue and bauxite, which is characterized in that metal elements such as gallium and aluminum in the waste residues can be uniformly distributed through powdering and proper mixing, ammonium sulfate is added in the roasting process, so that not only is the separation and release of gallium and aluminum realized, but also the generated ammonium sulfate gas is cooled, crystallized and recycled, and the production cost is reduced. According to the method, the process cost is reduced, acid leaching, alkaline leaching and composite extraction are adopted step by step, it is ensured that gallium is efficiently enriched and separated in all procedures, gallium oxide with the purity larger than or equal to 99.5% is finally obtained, meanwhile, residual silicon-rich residues and bauxite residues are subjected to hydrothermal crystallization to prepare molecular sieves, comprehensive utilization of waste residues is achieved, and obvious economic and environment-friendly benefits are achieved.

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 relates to the field of comprehensive utilization of resources, and discloses a method for comprehensively utilizing high-iron bauxite, which comprises the following steps of: grinding the high-iron bauxite into fine ore, and uniformly mixing the fine ore with a binder and water to form pellets; drying the made pellets at the temperature of 200-300 DEG C until the water content is below 1%; the dried pellets are added into an electric arc furnace and heated to 1500-1600 DEG C for melting, a molten pool is formed, hydrogen is introduced into the molten pool, and molten iron and slag are generated; the molten iron is used for steelmaking or made into castings, and the slag is used for separating and extracting Al2O3, Fe2O3 and SiO2 after water quenching. The high-iron bauxite is reduced through hydrogen, CO2 is not generated, carbon pollution is avoided, after iron is extracted, slag is subjected to water quenching, aluminum, silicon, iron and other components are separated and extracted, various components in the high-iron bauxite can be fully recycled, the recovery rate is high, the comprehensive utilization degree is high, and waste is little.

The preparation process comprises the following steps: uniformly mixing 80-90 parts by mass of fused mullite, 1-2 parts by mass of modified ZrSiO4 fine powder, 5-8 parts by mass of alpha-Al2O3 fine powder, 2-4 parts by mass of silicon powder, 3-5 parts by mass of aluminum powder and 3-5 parts by mass of mullite microsphere powder, adding 5-8 parts by mass of a binding agent, and uniformly mixing to obtain pug; the preparation process of the mullite microspheres comprises the following steps: mixing bauxite, feldspar and silica powder, adding water, grinding into slurry, carrying out spray drying, sintering, and rapidly cooling after sintering; the pug is sealed and stacked for 12-24 h and then subjected to high-pressure forming, and a blank is obtained; and gradually heating the blank to 120 DEG C, drying for 24-48 hours, and firing and molding. The ultralow-porosity anti-erosion brick is low in porosity and good in anti-erosion performance.

The invention discloses an enhanced high-temperature wear-resistant refractory castable. Comprising the following raw materials in parts by weight: 84.5 to 93.6 parts of high bauxite, 21.4 to 25.3 parts of andalusite, 32.5 to 37.8 parts of silicon oxide micro powder, 23.8 to 26.2 parts of silicon nitride micro powder, 6.8 to 9.2 parts of aluminum triphosphate, 6.3 to 10.5 parts of aluminum oxide micro powder, 1.5 to 3.2 parts of attapulgite clay, 11.5 to 22.4 parts of calcium aluminate cement, 15.6 to 18.4 parts of modified short-cut basalt fiber, 5.7 to 6.5 parts of a water reducing agent and 1.5 to 3.2 parts of silica sol. The invention also discloses a preparation method of the enhanced high-temperature wear-resistant refractory castable. The high bauxite and the andalusite are combined as the aggregate, the weight and the heat conductivity of the castable are reduced, the strength of the castable is improved, the modified chopped basalt fiber has the advantages of light volume weight, high temperature resistance, good heat stability, low heat conductivity, small heat capacity, good mechanical vibration resistance, small thermal expansion and good heat insulation performance, and the compactness of the castable is further enhanced.

The invention discloses a low-temperature fast-fired anti-cutting and anti-cracking rock plate. The rock plate comprises a green body layer, a ground coat layer, a decorative layer and a glazed layer which are sequentially arranged from bottom to top, the green body layer is prepared from the following raw materials in parts by mass: 2 to 4 parts of bentonite, 8 to 12 parts of bauxite, 3 to 5 parts of magnesia soil, 22 to 28 parts of waste brick powder, 8 to 12 parts of washed mud, 22 to 26 parts of bluestone and 21 to 25 parts of yellow sand; the waste brick powder is prepared from the following chemical components in percentage by mass: 65 to 66 percent of SiO2, 18 to 19 percent of Al2O3, 1.7 to 1.8 percent of Fe2O3, 0.50 to 1 percent of TiO2, 0.5 to 0.7 percent of CaO, 1.7 to 1.8 percent of MgO, 1.9 to 2 percent of K2O and 2 to 2.1 percent of Na2O; the bluestone is prepared from chemical components in percentage by mass as follows: 70%-71% of SiO2, 14%-14.5% of Al2O3, 3.0%-3.2% of Fe2O3, 0.2%-0.3% of TiO2, 1%-1.1% of CaO, 1.2%-1.4% of MgO, 1.3%-1.5% of K2O, 3.8%-4.0% of Na2O and the balance of ignition loss. According to the low-temperature fast-firing anti-cutting rock plate provided by the invention, on the premise of realizing low-temperature fast firing, the anti-cutting performance and the strength are improved.

The invention relates to a resourceful treatment method for a bauxite ore washing tail mud reservoir, which comprises the following specific steps: 1, carrying out cyclone classification on tail mud in the tail mud reservoir, and separating out coarse particles with A / S greater than or equal to Y and A / Slt; and Y fine particles. And 2, carrying out flotation treatment on the coarse particles. And potassium carbonate is added as a dispersing agent and a pH value adjusting agent, the pH value of the ore pulp is adjusted to 8.0-10.5, then sodium oleate is added as a collecting agent, and finally bauxite concentrate and flotation tailings are obtained. And 3, dehydrating the fine particles to obtain dehydrated tail mud with the water content of less than or equal to 20%. And 4, adding the flotation tailings and the dehydrated tail mud into a curing agent or a soil conditioner to form cultivable soil which is used for ecological restoration of the stony desertification area. Potassium carbonate is used for replacing sodium carbonate to reinforce flotation, so that tailings can be used as potassium-rich cultivation soil; the dam break risk can be eliminated after the tail mud is dehydrated; tailings and fine particles are compounded to form cultivation soil to treat stony desertification, silicon fertilizer is synchronously produced, the annual income is larger than or equal to 0.3 million yuan, and safe, resource and ecological cooperative treatment is achieved.

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.

Methods and systems for recovering and reusing conductive additives for flash Joule heating. The conductive additive or flash Joule heated material utilized, such as electronic waste, ore, fly ash, soil, and / or bauxite slag, may be recovered at high recovery yields higher than 85%, and then may be reused for additional flash Joule heating processes. The conductive additive may be separated from the product of the flash Joule heating process, such as by screening or by centrifugation, filtration, and drying.

The invention relates to the technical field of transportation equipment, in particular to an aluminum oxide production raw material conveying assembly which comprises a main conveying belt and an auxiliary conveying belt which are obliquely installed in an attached mode through a supporting assembly. The main conveying belt is located at the bottom and used for conveying crushed bauxite to the screening machine, and the auxiliary conveying belt is located at the top and used for receiving and returning over-specification materials separated by the screening machine and serves as a dustproof mechanism to cover the main conveying belt. Side eaves plates are arranged on the main conveying belt and the auxiliary conveying belt, and main push plates and auxiliary push plates are arranged on the side eaves plates of the main conveying belt and the auxiliary conveying belt at intervals; the auxiliary push plate is of a hollow structure, guide grooves are formed in the two sides of the auxiliary push plate, a pop-up sealing plate is installed in the guide grooves through a support, and the bottom of the support is connected with a pop-up piece. A magnetic base is arranged at the bottom of the auxiliary conveying belt, and when the auxiliary pushing plate rotates to the position attached to the main pushing plate along with the auxiliary conveying belt, the magnetic base triggers the closing plate to pop out and be in sealed connection with the two sides of the main pushing plate; the purpose of dynamically sealing to reduce flying dust during bauxite conveying is achieved.

An online detection method for a bauxite component, and a related device. The method comprises: controlling an LIBS system to collect n pieces of actual spectral data from bauxite to be tested on a preset-speed conveyor belt; performing a preset processing operation on the n pieces of actual spectral data, so as to acquire a set of preprocessed actual spectral data; calculating a screening distance between each piece of preprocessed actual spectral data in the set of preprocessed actual spectral data and a bauxite category spectrum, and adding, to an effective spectral data set, the preprocessed actual spectral data with the screening distance less than or equal to a preset distance, wherein the bauxite category spectrum is obtained by measuring a standard sample with known components on the basis of a static mode; using the average value of the first m pieces of spectral data in the effective spectral data set as actual continuous transmission spectral data; and inputting the actual continuous transmission spectral data into an optimal model, so as to acquire a bauxite component corresponding to each piece of spectral data.

The invention discloses high-strength and high-impermeability aluminate cement and a preparation method thereof, particularly relates to the technical field of cement, and relates to the high-strength and high-impermeability aluminate cement and the preparation method thereof. The high-strength and high-impermeability aluminate cement is prepared from the following raw materials in parts by weight: 48 to 55 parts of bauxite, 10 to 15 parts of modified forsterite, 3 to 5 parts of aluminum borate, 12 to 15 parts of limestone, 8 to 10 parts of gypsum, 4 to 6 parts of titanium dioxide, 2 to 3 parts of lithium carbonate and 2 to 3 parts of silica fume. The microstructures formed under the guidance of the biomineralization template agent effectively reduce the porosity and aperture in the cement, reduce permeation channels of moisture and harmful media, and improve the impermeability of the cement.

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 relates to the technical field of regenerated aluminum oxide preparation, in particular to a preparation method, production equipment and application of regenerated aluminum oxide superfine powder. The preparation method comprises the following steps: sequentially carrying out centrifugal spray drying and fluidized drying on a regenerated aluminum oxide wet material, carrying out fluidized roasting phase inversion, and carrying out high-temperature jet milling and grading, and the regenerated aluminum oxide wet material is mainly prepared from aluminum ash. According to the method, the regenerated aluminum oxide wet material is utilized, the regenerated aluminum oxide superfine powder with the main component being alpha-Al2O3 can be prepared, bauxite does not need to be processed, and the problems that operation is complex in the bauxite processing process and the crisis of bauxite backup resources is aggravated are solved.

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.

The utility model relates to the technical field of wastewater purification, and discloses a bauxite flotation tailing wastewater purification device which comprises a base station, a settling tank is fixedly connected to the upper surface of the base station, first motors and stand columns are symmetrically arranged on the two sides of the settling tank, and the output ends of the first motors are fixedly connected with chain wheels; the chain wheels are rotationally connected to the side wall of the stand column, a chain is arranged between the chain wheels, the outer wall of the limiting column is slidably connected with a movable block, the side wall of the movable block is fixedly connected with a connecting plate, and the side wall of the connecting plate is fixedly connected with a filter plate. According to the device, firstly, wastewater is injected into the settling tank, after standing, large particles are settled on the filter plate, the first motor drives the chain wheel to rotate to enable the chain to move, and the movable block is driven to slide to enable the connecting plate and the filter plate to move, so that the large particles in the wastewater are quickly separated; the problem that large particles are difficult to effectively separate in traditional wastewater treatment is solved, and the wastewater treatment efficiency and the practicability and reliability of the device are improved.

The invention belongs to the technical field of refractory materials, and particularly discloses a preparation method of an aerogel modified silicon mullite brick with high strength and low heat-conducting property. Comprising 5-15 parts of silicon carbide particles, 50-70 parts of bauxite A, 19-29 parts of bauxite B, 5-10 parts of bauxite fine powder, 1-2 parts of unmodified aerogel powder, 1 part of a solvent and 3-6 parts of alcohol. The preparation method comprises the following steps: 1, mechanically stirring and mixing silicon carbide particles, bauxite A, bauxite B, bauxite fine powder and a solvent to obtain a mixed raw material; 2, adding the aerogel powder into the mixed raw material, and continuously stirring and mixing to form aggregate; step 3, processing the aggregate through a brick press to obtain a green brick; and 4, placing the green brick in a tunnel kiln, carrying out gradient heating sintering, and discharging the green brick out of the kiln to obtain the aerogel modified silicon mullite brick. The refractory material has low heat conductivity, high strength and good fire resistance, and has remarkable economic benefits and environmental protection values.

The invention discloses a lightweight high-strength ceramsite proppant based on composite coating and low-temperature densification and a preparation method thereof. The coating proppant comprises a ceramsite proppant and a coating layer coating the surface of the ceramsite proppant, relates to the technical field of petroleum and natural gas engineering fracturing. The ceramsite proppant comprises bauxite, perlite, a composite sintering aid, B2O3 and AlF3. The composite sintering aid comprises MnO2 and TiO2; wherein the weight part ratio of the bauxite to the perlite to the composite sintering aid to the B2O3 to the AlF3 is 80: 20: (2.5-7.5): (3-12): (3-12); the low-grade bauxite and high-silicon raw material system is adopted, and a proper amount of sintering aid is introduced, so that the sintering temperature is effectively reduced, and the energy consumption is reduced; meanwhile, the volume density of the ceramsite proppant is reduced, and a lightweight product is obtained.

The application relates to a bauxite-based corundum mullite hollow sphere with a gradient structure and a preparation method thereof, and belongs to the field of heat-insulating refractory materials. The preparation method comprises the following steps: firstly, high-alumina bauxite is beneficiated and classified and homogenized, then, according to a certain mass percentage, III-grade high-alumina bauxite, silica, mixed additives and an organic binder are uniformly mixed and granulated; taking spherical particles as cores, II-grade high-alumina bauxite and I-grade high-alumina bauxite are sequentially wrapped under the rotation of a granulator to obtain a non-homogeneous spherical particle blank body with a SiO2-rich interior; and finally, the corundum mullite hollow sphere with the gradient structure is obtained through high-temperature calcination. The refractory hollow sphere is designed with the gradient structure through the combined process of high-alumina bauxite classification and homogenization, coating forming and high-temperature calcination in-situ pore forming, the phase performance characteristics of corundum and mullite are fully utilized, and the refractory hollow sphere with the low thermal conductivity, the good corrosion resistance, the high use temperature and the excellent thermal shock resistance is developed.

The invention provides a method for separating aluminum and iron in high-iron bauxite, which comprises the following steps: grinding the high-iron bauxite to obtain bauxite particles; alkali liquor and the bauxite particles are mixed for first dissolution, and iron-rich ore and a first aluminum-containing solution are obtained after separation; the obtained iron-rich ore is roasted, and roasted concentrate is obtained; and the obtained roasted concentrate and the obtained first aluminum-containing solution are mixed for second dissolution, and iron-rich concentrate and a second aluminum-containing solution are obtained after separation. According to the method, aluminum in the high-iron bauxite can be efficiently dissolved out, alkali consumption in the process is greatly reduced, meanwhile, iron-containing minerals are fully enriched, the obtained iron-rich concentrate can be used for ironmaking, the process is simple, and good economic and environmental benefits are achieved.

The invention belongs to the technical field of high-iron bauxite resource utilization, and discloses a method for removing iron in high-iron bauxite, which comprises the following steps: mixing and stirring high-iron bauxite, an iron removal agent and water to obtain mixed ore pulp; wherein the iron removal agent is a mixture of oxalic acid and oxalate; stirring and leaching the mixed ore pulp so as to carry out iron removal reaction; after the iron removal reaction is finished, liquid-solid separation is carried out, and leaching residues and leaching liquid are obtained; adjusting the pH value of the leachate, and stirring to carry out a reaction of precipitating iron and aluminum; after the precipitation reaction is finished, carrying out liquid-solid separation to obtain filter residues and filtrate containing oxalate; carrying out an aluminum removal reaction on the filter residue by using an aluminum removal agent, and after the aluminum removal reaction is finished, carrying out liquid-solid separation to obtain a ferric hydroxide precipitate and a sodium aluminate solution; according to the method, aluminum and iron in the aluminum-iron embedded structure in the high-iron bauxite are removed through wet preimpregnation, the adverse effect of iron oxide on aluminum mineral dissolution is eliminated, and the dissolution rate of the aluminum mineral is increased.

The present application relates to the technical field of impurity removal and quality improvement of non-ferrous metals, and in particular to a method for decarbonization and iron removal of high-sulfur bauxite; the method comprises: crushing the high-sulfur bauxite and screening it with a preset particle size to obtain fine-grained high-sulfur bauxite; wet coarse grinding the fine-grained high-sulfur bauxite to obtain a coarse-ground slurry; adjusting the pH value of the coarse-ground slurry, and then adding a flotation agent to the coarse-ground slurry for flotation to obtain a desulfurized aluminum concentrate; finely grinding the desulfurized aluminum concentrate and performing strong magnetic separation to obtain a low-carbon and low-iron aluminum concentrate and a high-carbon and high-iron tailings, respectively; the flotation agent comprises an inhibitor, an activator, a composite desulfurization collector and a frother; the preset particle size is 6 mm to 9 mm; and adopts a "stage grinding-flotation magnetic combined stage separation technology" with the characteristics of low energy consumption, low production cost, high recovery rate, strong process adaptability, stable production, and high comprehensive utilization rate.

The invention relates to the technical field of bauxite resource treatment, in particular to a beneficiation and desilicication method for low-grade bauxite. The aluminum-silicon ratio of the low-grade bauxite is 2.0-2.5, the low-grade bauxite comprises useful minerals and gangue minerals, and the beneficiation and desilicication method comprises the following steps: crushing the low-grade bauxite to obtain bauxite particles; the bauxite particles are subjected to rod milling and grading, and a first-size-fraction material, a second-size-fraction material and a third-size-fraction material are obtained; the first fraction material is subjected to dense medium cyclone separation, and gravity concentrate and gravity tailings are obtained; sorting the second fraction material by a first spiral chute to obtain first concentrate and first tailings; the third-fraction material is separated through a second spiral chute, and second concentrate and second tailings are obtained; the gravity concentrate, the first concentrate and the second concentrate are combined, and aluminum concentrate is obtained; and the gravity separation tailings, the first tailings and the second tailings are combined, and tailings are obtained. According to the beneficiation and desilicication method, efficient separation of aluminum minerals and siliceous gangue is achieved through collaborative innovation of multiple stages of processes.

The invention relates to the field of high-efficiency utilization of high-iron bauxite, in particular to a high-iron bauxite roasting and activating treatment method which comprises the following steps: adding an activating agent into high-iron bauxite, mixing, and grinding to prepare pellets; activating the pellets in a closed reactor to obtain a magnetic iron-rich phase and activated roasted ore; the activated roasted ore is subjected to solid-liquid separation through a calcification transformation high-temperature dissolution technology, and a sodium aluminate solution and calcification transformation red mud are obtained. According to the method, the removal rate of the treated organic matter is larger than 90%, the non-magnetic iron-rich phase is converted into the magnetic iron-rich phase after activation treatment, the iron recovery rate is larger than 50% after heavy magnetic separation, the yield is larger than 35%, the TFe of the iron concentrate powder reaches 56% or above, and the red mud per ton of aluminum oxide is reduced by more than 35% from an aluminum oxide production source; by adopting a calcification transformation high-temperature dissolution technology, the dissolution rate is increased by 3-5%, the alkali content in the red mud is less than 1%, and red mud source reduction and red mud harmless treatment for producing aluminum oxide from high-iron bauxite can be realized.

The invention relates to the technical field of metallurgical dust and mud roasting, in particular to a method for controlling ring formation of a kiln body of a metallurgical dust and mud roasting rotary kiln, which comprises the following steps: firstly, carrying out three-stage washing desalination and dechlorination on metallurgical dust and mud raw materials, and then adding high bauxite or magnesium oxide to prepare a mixture with a specific proportion; the roasting operation is divided into three stages of feeding preheating, high-temperature roasting regulation and control and cooling and discharging, and parameters such as the feeding speed and the preheating temperature are controlled during feeding preheating; alternate air blowing is adopted for high-temperature roasting regulation and control; and materials are cooled through a quenching section and a slow cooling section in the cooling and discharging stages. Through three-stage washing desalination and dechlorination, the contents of Cl <->, Na < + > and K < + > in the raw materials are greatly reduced, ring formation is inhibited from the source, the proportion and the content of magnesium oxide and aluminum oxide in the mixture are accurately adjusted, generation of a high-melting-point mineral phase is promoted, a low-melting-point glass phase is reduced, the ring formation resistance is enhanced, and the environment in the kiln is stabilized by accurately controlling parameters of all stages of roasting, so that the ring formation resistance is improved. And local overheating and melt aggregation are avoided.