96 results about "High aluminum" patented technology

The invention relates to the technical field of magnesium alloys, in particular to a high-toughness rare earth-containing magnesium alloy and a preparation method thereof.The high-toughness rare earth-containing magnesium alloy is prepared from, by weight, 3-8 parts of Zn, 1-5 parts of RE, 0.5-3 parts of Al, 0.1-1 part of Mn, 0.05-0.3 part of Zr and the balance Mg; rE is a combination of Y, Nd and La in a mass ratio of (2-3): 1: (0.5-1). Zinc is used as a secondary main element to replace part of aluminum, efficient solid solution strengthening is achieved through high solid solubility of zinc in magnesium, meanwhile, the morphology and distribution of a precipitated phase are regulated through rare earth, a beta-MgZn2 phase is formed, the high-temperature stability is better, balance optimization of strength, toughness and corrosion resistance is achieved, meanwhile, the welding performance of the alloy is improved through combination of Y, Nd, La and Zr, and the welding performance of the alloy is improved. The hot crack tendency is reduced, the brittle phase problem of a traditional high aluminum alloy is avoided, and the corrosion resistance and the machining performance are synergistically improved.

The invention discloses a normalizing-free method for producing high-grade non-oriented electrical steel, and belongs to the technical field of steel rolling. In order to solve the problem in non-normalizing production of high-grade non-oriented electrical steel with high silicon and high aluminum, the invention provides a method for producing the high-grade non-oriented electrical steel without normalizing, the high-grade non-oriented electrical steel contains 2.8-3.2 wt% of Si and 0.2-1 wt% of Al, and a hot rolling process, an acid pickling process and a cold rolling process are adopted, the hot rolling process adopts low-temperature plate blank heating, width fixing, rough rolling, finish rolling and high-temperature coiling heat treatment, and the cold rolling process adopts primary cold rolling, intermediate annealing, secondary cold rolling and finished product annealing. Under the condition of no special normalizing production line for the electrical steel, the hot rolling reduction rate and the coiling temperature are adjusted, the heat preservation pit is additionally arranged, hot rolling waste heat self-annealing is used for replacing normalizing, and the reduction rate and the annealing temperature of primary cold rolling and secondary cold rolling are reasonably distributed; and the high-efficiency non-oriented electrical steel with excellent large grain size and excellent magnetic performance is successfully developed.

The invention relates to a control method for improving EDT roller texturing efficiency and high-surface automobile aluminum plate oil storage amount. The control method comprises the steps that (1) a single-rack cold rolling mill is adopted; (2) carrying out roller surface treatment by adopting an electrode electric spark roller grinder, wherein the roughness Ra of a working roller before roughening is less than or equal to 0.4 mu m; the roughness Ra after EDT roughening is equal to 1.95 to 2.2 [mu] m; (3) a single-rack cold rolling mill is adopted for production, the rolling oil temperature is 35 + / -5 DEG C, and the rolling oil pressure is 6.0-9.0 bar; (4) an air cushion type continuous annealing line is adopted for cleaning and solid solution aging treatment; (5) carrying out surface appearance and pit size measurement on the prepared aluminum plate by adopting a 3D optical microscope; and (6) the manufactured aluminum plate is measured through a 3D non-contact optical contourgraph. By means of the method, the requirements for the surface roughness Ra and Rpc of the automobile sheet can be met, the downstream stamping cracking risk and the corrosion spot defect caused by the too large surface pit diameter are reduced, the better high-surface automobile sheet, the higher aluminum sheet surface oil storage amount and the lower friction coefficient can be obtained, and the EDT roller texturing working time can be saved.

The invention belongs to the technical field of refractory materials, and discloses a method for preparing a refractory raw material by utilizing harmless treatment of secondary aluminum ash, which comprises the following steps: selecting hazardous solid waste secondary aluminum ash rich in potassium, sodium, fluorine, chlorine and other harmful substances as a treatment object, grinding, sieving, mixing with sulfite paper pulp waste liquid, and pressing into a porous honeycomb aluminum ash standard brick. Preparing a refractory raw material through the processes of normal-temperature maintenance, heat treatment in a high-temperature nitrogen environment and the like; the technological process is simple, and during high-temperature heat treatment, fluorine, chlorine, potassium, sodium and other alkali ions contained in the aluminum ash are volatilized under the high-temperature driving effect; under the protection of nitrogen atmosphere, the binding capacity between alkali ions such as potassium and sodium and silicon oxide and aluminum oxide in the aluminum ash during volatilization is reduced, and the alkali ions are promoted to effectively escape, so that the alkali removal effect is achieved, and a harmless refractory raw material is obtained; the method is low in production cost, high in aluminum ash treatment efficiency, high in dealkalization rate and good in effect, secondary pollution caused in the aluminum ash treatment process is avoided, and the resource utilization level is improved.

The invention relates to the technical field of coal solid waste resource utilization. The invention provides a method for preparing aluminum oxide based on flash firing of coal solid waste. The method comprises the following steps: S1, calcining coal gangue in a flash firing suspension kiln to obtain clinker; s2, pre-desiliconization through dilute alkali treatment; (S3) dissolving the low-silicon clinker by using dilute sulphuric acid: adding 18-21 wt% of dilute sulphuric acid into the high-temperature reaction kettle, heating to 130-165 DEG C, stirring and reacting for 2-3 hours, when the PH is 4-5, completing the reaction, and carrying out solid-liquid separation and filtration to obtain an aluminum-containing leachate and silicon-containing residues; heating and concentrating the aluminum-containing leachate, cooling to form crystallized aluminum sulfate, heating at the rate of 10-20 DEG C / h, removing crystal water at 300-600 DEG C, heating to 950-960 DEG C at the rate of 15-30 DEG C / h, and firing to form crude aluminum oxide; and S4, performing low-temperature concentrated alkali purification to obtain the metallurgical-grade aluminum oxide. The method has the advantages of high reaction efficiency, high aluminum utilization rate, low impurity content, low acid, alkali and water consumption, low cost and the like.

The invention belongs to the field of composite materials, and discloses a high-airtightness nano injection molding polybutylene terephthalate composite material and application thereof. The composite material comprises the following components in percentage by weight: 23%-82.5% of PBT (Polybutylece Terephthalate); 5%-15% of polyarylester; 2%-8% of a reactive flexibilizer; 0.5 to 2% of an ionomer; 0-1% of an antioxidant; 0-1% of a release agent; 10%-50% of glass fiber; the PBT composite material provided by the invention can realize high and stable air tightness, and also has high aluminum alloy binding force and good mechanical properties. Meanwhile, the preparation method disclosed by the invention is simple and feasible, and is suitable for large-scale production.

The invention discloses a method for composite etching of an electroplating gold plating layer, which comprises the following steps of: manufacturing a photoetching pattern on the front surface of gallium arsenide epitaxy, then evaporating a metal contact layer, depositing a SiNx protective mask layer, performing Mesa mesa etching on the gallium arsenide epitaxy, exposing a high-aluminum layer on the side surface of an epitaxial material, and forming an aluminum oxide limiting layer by adopting a wet oxidation process; a second SiNx protective mask layer continues to be deposited, and the metal contact layer is exposed through dry etching; forming a seed gold layer by adopting magnetron sputtering TiW / Au metal, and forming a photoresist mask with a target electrode pattern on the seed gold layer; electroplating thick gold on the photoresist mask pattern; the photoresist mask layer is removed after completion; the method of combining dry etching and wet etching is adopted to remove the gold plating layer in the non-electroplating area, so that the lateral corrosion of the metal layer is obviously reduced, the high-precision and high-fidelity electrode pattern transfer is realized, the lateral corrosion of the metal layer is reduced, and the passivation protection effect of the device is improved.

The application provides an automatic titration analysis method for measuring the aluminum content in high aluminum alloy, which adopts direct reaction of fluoride with a test solution to realize one-step direct titration, and determines the aluminum content in the range of 2.00% to 100.00%, and comprises the following steps: sample decomposition; precipitation of interfering ions; calibration of sodium fluoride standard solution; calibration of automatic potentiometric titrator; and measurement of the sample to be tested. The application solves the problems of sample pretreatment and how to avoid the influence of interfering ions on the determination of aluminum content. The titration operation, reading and calculation are automatically completed by the instrument, effectively reducing human errors, and the application has the advantages of simple operation, accurate and rapid results, wide application range and the like.

The application discloses a kind of paper printing vacuum aluminum plating water-based coating liquid.The coating liquid includes low Tg / high hardness water-based acrylic emulsion and polycarbonate type and / or acrylic modified water-based polyurethane dispersion as film-forming material, with water-based auxiliary agent, film-forming auxiliary agent, wax emulsion, water and other substances.Low Tg / high hardness water-based acrylic emulsion is to use alkali-soluble acrylic ester solid resin selected under specific condition as reactive macromolecular rheological control emulsifier, and to use seed emulsion polymerization method to synthesize core-shell structure of styrene-acrylic emulsion.The coating liquid of the application has excellent rheological property, excellent sealing property and film-forming property, super-high aluminum plating gloss, wear resistance, excellent anti-sticking and anti-glare property, chemical resistance, resolubility, printing adaptability, environmental protection, and is suitable for various printing and coating methods, especially suitable for printing industry of tobacco and liquor with extremely strict requirements on printing speed, drying speed, wear resistance, anti-sticking and aluminum plating appearance.

The invention provides an aluminum-doped lithium cobalt oxide precursor and a preparation method and application thereof, and the preparation method comprises the following steps: (1) a nucleation stage: adding a cobalt chloride solution, an aluminum salt solution and a precipitant solution into a reaction base solution, and carrying out first coprecipitation to obtain a solution containing an inner core; (2) growth stage: adding a cobaltous sulfate solution, an aluminum salt solution and a precipitant solution into the solution containing the inner core obtained in the step (1), and carrying out second coprecipitation to obtain a solution containing precipitates; and (3) final stage: adding a solution containing cobalt chloride and cobalt sulfate, an aluminum salt solution and a precipitator solution into the solution containing the precipitate obtained in the step (2), carrying out third coprecipitation, and carrying out heat treatment to obtain the aluminum-doped lithium cobalt oxide precursor. According to the preparation method, the problems of particle cracking and small particle explosion of aluminum-doped cobaltosic oxide under the condition of high aluminum doping amount can be avoided, and a lithium cobalt oxide battery prepared from the obtained aluminum-doped lithium cobalt oxide precursor shows excellent electrochemical performance.

The present invention belongs to the technical field of composite materials, and specifically relates to a medium-manganese high-aluminum steel with high wear resistance, its heat treatment method and application. The chemical composition of the medium-manganese high-aluminum steel with high wear resistance and its corresponding weight percentage are as follows: C is 0.4 - 0.5 wt%, Si is 0.01 - 0.05 wt%, Mn is 9.5 - 10.5 wt%, Al is 2.1 - 3.9 wt%, V + Mo is 0.2 - 0.3 wt%, Nb is 0.05 - 0.15 wt%, and the rest is Fe and inevitable impurities, and at the same time, 4 < Mn / Al < 6, 1 < Mo / V < 3, 1 < (V + Mo) / Si < 6 are satisfied. Its heat treatment method includes first performing water toughening treatment on the medium-manganese high-aluminum steel ingot, and then performing aging treatment to obtain the medium-manganese high-aluminum steel with high wear resistance. It improves the limitations such as low hardness and low-temperature brittle fracture of traditional manganese steel, and has the characteristics of uniform composition distribution, high stability, high hardness and good wear resistance.

The application provides a kind of six-roller aluminum cold rolling mill roughening work roll calibration method: including the following steps: step S1: roughening work roll change roll is finished;Step S2: system parameter initialization;Step S3: roll gap pretreatment;Step S4: low pressure pre-pressing;Step S5: roll gap continues to close: continue to roll gap to roll gap clearance reaches 1mm position, keep low pressure pre-pressing state;Step S6: warm roll;Step S7: gradually promote rolling force to press full load;Step S8: AGC roll gap automatic zero and system zero calibration clear zero;Step S9: calibration check;Step S10: calibration is completed, the application cancels the traditional independent warm roll process, and the roll surface preheating and indentation elimination are integrated into the calibration process, solve the roughness attenuation caused by long warm roll and the contradiction problem that short warm roll will cause horizontal line residue, calibration stage embeds 1 minute uniform speed roll, realizes slight preheating by using roll system friction heat generation, and avoids horizontal line by dynamic roll rotation.

The present application relates to a kind of red mud-based ferrite cement and its preparation method, belong to cement clinker technical field.The raw material includes the following weight parts of component: high calcium solid waste 50-60 parts, high silicon solid waste 15-25 parts, high aluminum solid waste 10-25 parts, bayer red mud 20-40 parts and high sulfur solid waste 0-10 parts.Preparation method includes the following steps: S1, after high calcium solid waste, high silicon solid waste, high aluminum solid waste and bayer red mud are mixed, after grinding, homogenization, sample preparation, calcination, cooling is made into red mud-based ferrite cement clinker;S2, red mud-based ferrite cement clinker and the remaining high calcium solid waste, high aluminum solid waste and high sulfur solid waste are mixed, and are ground together, obtain red mud-based ferrite cement.Can utilize the high alkalinity of bayer red mud to prepare ferrite cement, realizes the efficient solidification of red mud alkaline component, solves the technical problem that red mud product is easy to alkali, can be largely absorbed red mud.

The utility model relates to a kind of mechanism for preventing six-roller aluminum cold rolling mill to retreat derail from roll-changing car, including roll-changing car, workbench and the track being set on workbench, roll-changing car can move along track, the outer end of track is provided with anti-derailment mechanism, and the anti-derailment mechanism includes the arc-shaped blocking surface extending to side upper direction along the outer end of track.This device is simple in structure, reasonable in design, and by setting arc-shaped blocking surface on the outer end of track, to prevent roll-changing car from moving too far, avoid derailing.

The invention discloses an aluminum-based silicon carbide composite battery shell, a preparation method thereof, a battery and electronic equipment, and relates to the technical field of battery shells. The aluminum-based silicon carbide composite middle layers with different silicon carbide contents and particle sizes are arranged, the silicon carbide content of the center layer is relatively high, the particle size is large, and enough strength support can be provided for the battery; the grain size of silicon carbide adopted by the secondary surface layer is relatively small, the adding amount is small, the interface bonding density of the material can be effectively improved, stress concentration is reduced, the strain compatibility of the aluminum-based silicon carbide composite middle layer in the plastic deformation process is improved, and therefore the ductility and the crack propagation resistance of the material are remarkably improved. According to the battery shell provided by the invention, the overall strength of the material is ensured on the premise of realizing light weight, meanwhile, the surface layer is made of the aluminum alloy with high aluminum content, so that the battery shell has relatively good corrosion resistance and weldability, and the welding sealing property can be realized by adopting laser welding after the battery shell is formed.

This invention discloses a method and system for sorting aluminum waste, relating to the field of renewable resource recycling. The method includes: crushing to 5-10cm blocks; shredding to 1-3cm particles; flotation separation using bubbles to float aluminum alloys; magnetic separation to remove ferromagnetic impurities; optical separation based on color identification to separate non-ferrous metals such as copper and zinc; gravity separation using a shaking table to separate heavy impurities; and refining to remove the surface oxide layer. For waste from thermal power plants, fly ash is removed before crushing by screening with an 80-120 mesh screen. This invention also discloses a system for executing this method, comprising a crusher, shredder, flotation machine, magnetic separator, color sorter, shaking table, and polishing machine connected in sequence, and equipped with a closed-loop control unit. This invention, through a seven-stage collaborative sorting process and intelligent feedback adjustment, significantly improves the sorting accuracy and product purity of aluminum waste, and is particularly suitable for aluminum-containing waste from thermal power plants with complex compositions, achieving a high aluminum alloy recovery rate.

The invention discloses a method for extruding a titanium alloy cast ingot into a bar billet, which is used for a titanium alloy with high aluminum equivalent and low molybdenum equivalent and comprises the following steps: step S1, preparation before extrusion; preparing a titanium alloy cast ingot, an extrusion die, a glass pad and a pressure residue replacement block; s2, first extrusion is carried out; preheating the extrusion cylinder and the pressure residue replacement block; heating the titanium alloy cast ingot; performing extrusion; pressure residues are cut off; s3, heat treatment and straightening; recrystallizing the deformed structure through heat treatment so as to refine the structure; then carrying out straightening treatment; s4, second extrusion is carried out; preheating an extrusion cylinder and an extrusion residue replacement block, and heating the initial blank of the extrusion rod; then carrying out extrusion; cutting off the pressure residual part; and S5, straightening / reducing is conducted, and finally the titanium alloy bar which is not cracked and formed through extrusion is obtained. The problems that lubrication is difficult and deformation is uneven in the extrusion process are effectively solved, the working procedures are reduced, the workload of grinding cracks is reduced, and the yield is increased.

A cement clinker composition incorporates calcium fluoride and iron oxide to reduce firing temperatures and increase strength. High fly ash, aluminum dross, aluminum scrap, high aluminum clays and combinations thereof may also be substituted for bauxite in the cement clinker composition.

The invention belongs to the technical field of preparation of aluminum-containing compounds, and particularly discloses a method for preparing aluminum hydroxide with high specific surface area based on sodium tetrachloroaluminate. The preparation method comprises the following steps: mixing a sodium tetrachloroaluminate raw material (sodium tetrachloroaluminate solid waste residue as a byproduct in production of glufosinate-ammonium or methyl phosphorus dichloride) with water to obtain a mixed solution; mixing the mixed solution with alkali liquor, and reacting to obtain reaction liquid containing aluminum hydroxide; and sequentially aging, separating and washing to obtain the aluminum hydroxide with high specific surface area. The obtained aluminum hydroxide is a porous material, the specific surface area reaches 300 m < 2 > / g or above, the microstructure is a sheet / block nanoparticle combination, and the aluminum hydroxide has good dispersity and activity and can be used in the fields of catalyst carriers, adsorbents, flame retardants and the like. The method is simple in process and does not involve complex equipment and high energy consumption conditions; and when the treated object is industrial solid waste residue, the method has the advantages of high aluminum recovery rate, thorough impurity removal and no influence of phosphorus.

The invention belongs to the field of composite materials, and discloses a high-airtightness nano injection molding polyethylene glycol terephthalate composite material and application thereof. The composite material comprises the following components in percentage by weight: 22-83% of PCR PET (Polymerase Chain Reaction Polyethylene Terephthalate); 3%-7% of PBT; 1%-3% of cyclic PBT; 2%-8% of polyarylsulfone; 1%-8% of a reactive flexibilizer; 0-1% of an antioxidant; 0-1% of a release agent; 10%-50% of glass fiber; the composite material can realize high PCR content, has high air tightness and high aluminum-plastic binding force, and is smooth in demolding and stable in process. The problem that an existing PET nano injection molding material is insufficient in air tightness is solved.

The invention relates to an interlayer cooling laser additive preparation method of a nickel-based superalloy with high content of aluminum and titanium, and the nickel-based superalloy with high content of aluminum and titanium, which is improved in tensile strength, yield strength and elongation at room temperature, is prepared by adopting a laser additive manufacturing strategy, parameters and a deposition mode through an interlayer pause printing cooling method, and does not need to be preheated; the high-aluminum-titanium-content nickel-based superalloy with excellent mechanical properties is obtained while the period is shortened and the cost is reduced, rapid and intelligent manufacturing of the high-aluminum-titanium-content nickel-based superalloy is facilitated, and meanwhile the problem that the high-aluminum-titanium-content nickel-based superalloy is extremely prone to cracking is solved.

The present application relates to a kind of methods for removing aluminum from iron-containing aluminum feed liquid, and the present application relates to the field of hydrometallurgy, the method comprises: using saponifier saponification extractant, the saponifier is alkaline solution;Using saponified extractant to remove aluminum from the iron-containing aluminum feed liquid, control extraction equilibrium pH value is 0.5-3, obtain the raffinate removed aluminum and the aluminum extractant loaded;Aluminum-loaded extractant is sequentially washed and stripped, to obtain the extractant after stripping.The method of the present application has high aluminum extraction efficiency, so that iron and impurities such as aluminum are well separated.

The invention relates to a Beijing brick ceramic preparation method, which comprises: preparing a green body, weighing 25-35% by weight of kaolin, 35-40% by weight of potassium-sodium feldspar, 3-5% by weight of a high aluminum material, 5-6% by weight of anorthite and 1% by weight of a grinding aid additive, mixing, and ball-milling until the particle size D50 of the powder is less than or equal to 10 [mu] m to prepare a slurry; removing iron from the slurry through a 120-mesh sieve, and performing spray drying to obtain green body dry powder with the water content of 8-10%; surface effect treatment: bidirectionally pressurizing the green body dry powder by using a hydraulic press; and polishing, wherein a diamond grinding block and a fiber grinding block are combined for polishing. On the basis of wear resistance, skid resistance and light sensation optimization, the water-repellent anti-fouling polished tile synchronously has high mechanical strength and water-repellent anti-fouling property, can break through the application limitation of traditional polished tiles, is suitable for scenes such as historic building repair and cultural relic protection which have high requirements on cultural restoration, and also has good water-repellent anti-fouling performance. And the method can also be used for scenes with requirements on performance and texture, such as corridors, kindergarten activity rooms, high-end villa whole houses and the like.

The invention provides a method for improving quality of bauxite and efficiently enriching lithium, which comprises the following steps of: grinding and grading lithium-containing bauxite to obtain coarse-grained minerals and fine-grained minerals; the coarse-fraction minerals are subjected to reselection, reselected concentrates and reselected tailings are obtained, the reselected tailings and the fine-fraction minerals are combined for flotation operation, and flotation concentrates and flotation tailings are obtained; the flotation tailings are lithium-rich products, and the flotation concentrate and the gravity concentrate are combined into aluminum concentrate. According to the method, the quality of the bauxite concentrate is improved, the flotation amount and the consumption of the collecting agent can be reduced by 30% or above, meanwhile, efficient enrichment of lithium and the high aluminum-silicon ratio are achieved, and the aluminum-silicon ratio is about 10.

The invention discloses a method for detecting the content of aluminum ions in high-absorptivity resin, which is characterized by comprising the following steps: S1, pretreating a sample, weighing resin powder, adding nitric acid and H2O2, carrying out microwave digestion according to a gradient heating program, adding H2O2 after digestion, and carrying out secondary oxidation to eliminate possible residual nitrite; the step can realize complete decomposition of the resin, and the aluminum recovery rate is greater than or equal to 98.5%; s2, color development reaction: adding a buffer solution into the digested solution to control the pH value, adding a double masking agent, adding an 8-hydroxyquinoline ethanol solution, and reacting; and S3, spectrum detection: determining absorbance under the wavelength of 380 nm, and calculating the aluminum content through a standard curve. The method has the characteristics of high aluminum recovery rate, strong anti-interference capability, high sensitivity, good repeatability, short detection time and low cost.

The invention discloses pug for a medium-high aluminum electric porcelain hollow insulator and a preparation process of the pug, and relates to the technical field of electric porcelain hollow insulators, the pug is prepared from the following raw materials in parts by weight: 25-35 parts of refined bauxite, 15-25 parts of aluminum powder, 20-30 parts of kaolin, 5-10 parts of quartz and 5-10 parts of a potassium-sodium additive; wherein the refined bauxite is prepared by the following method: crushing and ball-milling bauxite, adding the bauxite into an oxalic acid solution I with the pH value of less than 2, stirring and reacting at 25-40 DEG C for 1-3 hours, performing solid-liquid separation, washing with an oxalic acid solution II, and drying to obtain solid slag; polysilazane resin powder and hexagonal boron nitride nanosheets are uniformly mixed, then a catalyst and solid slag are added, the mixture is uniformly mixed and calcined to obtain refined bauxite, and the refined bauxite has lower iron oxide content and tantalum carbide content and smaller porosity, so that the strength of the electroceramic hollow insulator can be improved.

The invention discloses high-alumina glass with high transmittance, low viscosity and excellent devitrification resistance and a preparation method of the high-alumina glass, and relates to the technical field of glass. Through multi-component collaborative design, the material formula is reconstructed and optimized, so that the finally produced high-aluminum glass effectively inhibits the crystallization tendency and reduces the melting temperature on the premise of high aluminum content, the mechanical properties, chemical resistance, ion exchange performance and high transmittance of the glass are synchronously improved, and the high-end application requirements of the market are met.

The application relates to a gibbsite-type bauxite processing method and belongs to the technical field of mineral processing, which comprises the following steps: crushing and grading gibbsite-type bauxite to obtain coarse-grained material and fine-grained material; removing impurities from the coarse-grained material by gravity separation to obtain gravity separation concentrate and gravity separation tailings; removing impurities from the fine-grained material by centrifugal mineral separation to obtain centrifugal concentrate and centrifugal tailings; wherein the separation density of the gravity separation is 1.7-3.0 g / cm 3 ; the separation density of the centrifugal mineral separation is 1.7-3.2 g / cm 3 ; the aluminum concentrate with high alumina content, high aluminum-silicon ratio and relatively low impurity content is obtained, the tailings with high silicon dioxide content, iron content and titanium content are obtained, the method has the characteristics of short mineral separation process, low mineral separation cost, low investment, high mineral separation efficiency, the concentrate is suitable for producing alumina by the Bayer method, and the tailings are applied to the building material industry.

SUMMARY OF THE DESCRIPTION This document describes compositions and formulations of lime-based cement extenders or cement substitutes, as well as associated systems and methods. In some embodiments, a lime-based cement extender or cement substitute composition includes at least 5 wt% lime particles and at least 50 wt% pozzolan particles. In some embodiments, the pozzolan particles include silicon dioxide and aluminum oxide. In some embodiments, the composition may be combined with additives and / or aggregates to produce a formulation. The formulation may have at least 5,000 ppm of soluble sulfate and an alumina:silica ratio of at least 0.2:1.Methods to accelerate the formation of calcium and aluminum sulfates to prevent sulfate attack during critical periods include producing a formulation with a high aluminum oxide content, using additives designed to accelerate certain chemical reactions, and omitting limestone. Methods to delay the formation of calcium and aluminum sulfates to prevent sulfate attack during critical periods include producing a formulation with additives designed to delay certain chemical reactions.