935 results about "Sodium aluminate" patented technology

The invention provides pseudo-boehmite and a preparation method thereof, and the method comprises the following steps: carrying out a neutralization reaction on sodium metaaluminate and an acidic aluminum salt to generate an amorphous precipitate, so as to obtain first slurry; filtering the first slurry, and pulping a filter cake obtained by filtering to obtain second slurry; and adjusting the pH value of the second slurry to a preset pH value by using an alkaline additive so as to age the second slurry, thereby obtaining the pseudo-boehmite. The prepared pseudo-boehmite meets the following indexes: the pore volume is greater than 1.2 ml / g, and the impurity content of acidic components is lower than 0.5 wt%.

The invention discloses an industrial process product quality estimation method based on a stacked ensemble learning model, and the method comprises the following steps: S1, carrying out the preprocessing and feature extraction of industrial evaporation operation data through a convolutional neural network model; s2, selecting and training a base learning device; s3, selecting a gradient boosting decision tree as a meta-learner of the stacked ensemble learning model, and estimating the concentration of the outlet sodium aluminate solution by taking a prediction result of the meta-learner and features extracted by the convolutional neural network model as input; and S4, calculating an error between the outlet solution concentration estimated value and an actual measurement value, and re-training the random forest model for error compensation to obtain a final outlet product quality estimated value. According to the industrial process product quality estimation method based on the stacked ensemble learning model, the estimation result has high accuracy, and the problem that the concentration of an outlet sodium aluminate solution in a multi-stage evaporation process in the aluminum oxide production process is difficult to estimate under the current industrial background can be solved.

The invention belongs to the field of coal gangue resource utilization, and particularly discloses a method for preparing fiber-reinforced coal gangue-based composite functional aerogel. After being activated, the coal gangue is put into an acid leaching solution to be leached, and an aluminum-rich solution is obtained; adding ammonia water into the aluminum-rich solution to adjust the pH to obtain hydroxide precipitate; adding a sodium hydroxide solution into the precipitate to react to obtain a sodium aluminate solution; neutralizing the sodium aluminate solution with hydrochloric acid to obtain an aluminum chloride solution, stirring to obtain aluminum sol, and adding ceramic fibers into the aluminum sol; violently stirring the sol, and adding epoxypropane to obtain wet gel; after aging the wet gel, carrying out surface modification to obtain hydrophobic coal gangue-based aluminum oxide and composite wet gel of the hydrophobic coal gangue-based aluminum oxide; and drying the modified wet gel at normal pressure to obtain the hydrophobic coal gangue-based aluminum oxide and the composite aerogel thereof. Ceramic fibers are introduced as a reinforcing phase, so that the compressive strength and toughness of the material are improved; the composite aerogel is subjected to surface modification, uniform modification is ensured, the contact angle is remarkably increased, the hygroscopicity is reduced, and the stability of the material is enhanced.

The invention relates to the technical field of non-ferrous metallurgy, and discloses a dissolution method of high-iron-monohydrate-boehmite type bauxite. The method comprises the following steps: (1) preparing mixed ore pulp from high-iron monohydrate bauxite, sodium aluminate circulating mother liquor and an additive; the additive is one or a mixture of more of organic alkali, carboxylic acid and amino acid; (2) the mixed ore pulp is subjected to ultrasonic treatment and then heated to 190-280 DEG C for a dissolution reaction, dissolution slurry and dissolution residues are obtained, the dissolution residues are subjected to magnetic separation and recovery, and iron ore concentrate is obtained; the power of the ultrasonic treatment is 200 to 300W, and the time of the ultrasonic treatment is 30 to 50 minutes. According to the method, the problem that iron minerals are difficult to separate due to silicon minerals in the dissolution process of the high-iron monohydrate bauxite is solved. The method is simple in process, low in production cost, low in equipment requirement and good in industrialization prospect.

The invention relates to a method for reducing lime consumption in a process of producing aluminum oxide by a Bayer process, which comprises the following steps: adding 1.5-3g of calcium-silicon slag into desiliconized sodium aluminate crude liquid per liter of the desiliconized sodium aluminate crude liquid, and uniformly stirring to obtain sodium aluminate crude liquid to be finely filtered; feeding the sodium aluminate crude liquid to be finely filtered into a leaf filter for finely filtering, and keeping the pressure in the leaf filter below 0.35 MPa to obtain sodium aluminate fine liquid. According to the method, the filter residue calcium-silicon residue in the desilicication process is used as a filter aid, so that the consumption of lime in the process of producing the aluminum oxide by the Bayer process is reduced, the production cost is reduced, and suspended matters in the sodium aluminate fine liquid are less than or equal to 0.01 g / L; meanwhile, lime milk is replaced by the solid calcium-silicon slag, so that the problems that the concentration of the sodium aluminate crude liquid is diluted due to the fact that the lime milk brings water and the lime milk reacts with sodium metaaluminate in the crude liquid to cause aluminum loss are solved, and the yield of aluminum oxide is increased.

The invention provides a method for preparing Bayer stone based on a high-alpha-k sodium aluminate solution, and belongs to the field of aluminum oxide preparation. The method comprises the following steps: adding a morphology regulating agent into a sodium aluminate solution with set alpha k to obtain a mixed solution; introducing a mixed gas with a set CO2 volume concentration into the mixed solution to perform a carbonation reaction under a set condition, and obtaining Bayer stone slurry when a reaction system of the carbonation reaction reaches a set NK concentration; and carrying out solid-liquid separation on the Bayer stone slurry to obtain the Bayer stone. The method comprises the following steps: firstly, adding a morphological regulating agent into a sodium aluminate solution to regulate the growth process and morphological characteristics of crystals so as to reduce crystal defects and impurity content; secondly, the carbonation reaction rate and the product composition are controlled by controlling the carbonation reaction conditions; and finally, by accurately controlling the end-point caustic alkali concentration, the mixing of impurities in the forming process of the Bayer stone can be reduced, so that a high-purity Bayer stone product is obtained.

The invention relates to the technical field of concrete admixtures, and discloses a nano rebound inhibitor for shotcrete and a preparation method thereof. The components, measured by weight, include 400-600 parts of nano microspheres, 400-550 parts of nano calcium carbonate, 10-30 parts of sodium carbonate, 1-10 parts of sodium aluminate, 10-30 parts of alum, 18-40 parts of polycarboxylic acid water reducer, and 0-0.5 parts of triterpenoid saponin; the nano microspheres are hydrated calcium silicate with silicon dioxide as the core material and colloid as the shell material, and the colloid is doped with a lithium source. The nano rebound inhibitor of the present application can significantly improve the state of shotcrete and greatly reduce the rebound amount of concrete, thereby further saving construction costs and accelerating construction accuracy. By utilizing the characteristics of the mineral admixture in the nano rebound inhibitor, the compactness of the concrete can be improved, and the durability of the shotcrete can be further improved.

The invention relates to the technical field of water treatment, and discloses an aluminum-based composite silicon removal agent and application thereof. The aluminum-based composite silicon removal agent comprises a component A and a component B, the component A is sodium metaaluminate; the component B comprises one or more of crystalline aluminum chloride, polyaluminum chloride and polyaluminum sulfate. The two components in the aluminum-based composite silicon removal agent can form multi-stage aluminum form distribution of'multi-core-mononuclear-colloid 'in wastewater, so that a complete silicon removal path of'pH regulation and control, charge neutralization, adsorption complexing, bridging flocculation and chemical precipitation' is constructed, and efficient removal of silicate radicals can be realized. The composite silicon removal agent does not need to accurately adjust the pH value of the system, the requirement for operation precision is low, operation is easy, and the dosage of the agent is small.

The invention provides a method for preparing low-sodium aluminum hydroxide through a two-stage method, and belongs to the field of aluminum hydroxide production. The method comprises the following steps: adding a first aluminum hydroxide seed into a sodium aluminate solution, and carrying out first-stage decomposition to obtain first mixed slurry; carrying out solid-liquid separation on the first mixed slurry to obtain first low-sodium aluminum hydroxide and separated mother liquor; adjusting the alpha k of the separated mother liquor to a second set alpha k; adding a second aluminum hydroxide seed into the separated mother liquor to perform second-stage decomposition to obtain second mixed slurry; and carrying out solid-liquid separation on the second mixed slurry to obtain second low-sodium aluminum hydroxide. According to the present invention, the sodium aluminate solution is subjected to the first-stage decomposition, such that the sodium aluminate solution is purified, the solution alpha k is increased, and the saturation degree of the solution is reduced so as to produce the aluminum hydroxide with the high purity during the second-stage decomposition, such that the technology of synchronously producing the two low-sodium aluminum hydroxide in the same process is achieved. Therefore, the impurity ion content of the metallurgical-grade aluminum hydroxide is reduced.

The invention relates to Bayer stone as well as a preparation method and application thereof, and belongs to the technical field of preparation of aluminum oxide or aluminum oxide precursor materials. The method comprises the following steps: mixing a Bayer stone seed crystal with an acidic aluminum source to obtain a first mixed solution; carrying out a neutralization reaction on the first mixed solution and sodium metaaluminate, and controlling the end point pH of the neutralization reaction to generate Alx (H2O) y (OH) mn < + > small clusters, so as to obtain a second mixed solution; and aging the second mixed solution at a set temperature, so that the Alx (H2O) y (OH) mn < + > small clusters are converted into a Bayer stone phase, and Bayer stone is obtained. The Bayer stone prepared by the invention meets the following indexes: the specific surface area is 325.3 m < 2 > / g to 382.3 m < 2 > / g, and the crystalline phase weight of the Bayer stone is 91.2 to 97.2 percent.

The invention discloses a process for treating nickel wastewater containing nickel acetate cleaning water and nickel acetate concentrated water, which comprises the following steps: S1, filtering nickel wastewater, S2, carrying out primary concentration treatment, S3, carrying out secondary concentration treatment, S4, treating by a sodium metaaluminate method, S5, carrying out collaborative filtration treatment, and S6, discharging RO (Reverse Osmosis) produced water up to the standard. The method comprises the following steps: primarily enriching nickel ions by adopting primary nickel concentration treatment and secondary nickel concentration treatment, adding a sodium metaaluminate solution into a mixed solution, enabling the pH value of the mixed solution to be 8-12, enabling the nickel ions to react with hydroxyl ions to generate a nickel hydroxide precipitate, adding a sulfuric acid solution to adjust the pH value of the mixed solution back to 6.5-7.5, hydrolyzing sodium metaaluminate to generate an aluminum hydroxide precipitate, and carrying out secondary nickel concentration treatment on the aluminum hydroxide precipitate; aluminum hydroxide adsorbs nickel hydroxide to form a composite precipitate, aluminum ions and nickel ions are subjected to a competitive complexation reaction, and a flocculating agent is added into a mixed solution to form a flocculent precipitate, so that the reaction time is short, the nickel content in the nickel sludge can be greatly increased, the treatment period can be shortened, and the operation cost can be reduced.

The invention provides pseudo-boehmite, a preparation method thereof and a gamma-alumina carrier with high diffusion mass transfer performance. The preparation method comprises the following steps: respectively preheating an aluminum-containing acidic solution, a sodium metaaluminate solution and reaction bottom water to gel forming reaction temperature; under stirring, dropwise adding the first part of the aluminum-containing acidic solution and the first part of the sodium metaaluminate solution into the reaction bottom water, controlling the pH value of the gelling reaction to be 5.0-8.5, and uniformly mixing to obtain material slurry; dropwise adding all the residual aluminum-containing acidic solution and the residual sodium metaaluminate solution into the material slurry, and carrying out gel forming reaction to obtain reaction slurry; and carrying out step-by-step variable-temperature aging on the reaction slurry, and carrying out suction filtration, washing and drying to obtain the pseudo-boehmite. According to the method, the problem of poor pore regulation flexibility in a traditional double-aluminum method is solved, the limitation of the pore size can be overcome, and the pore permeability of the gamma-alumina carrier is improved, so that the diffusion mass transfer performance of the gamma-alumina carrier is greatly enhanced.

The invention relates to the technical field of recovery processes of waste oil refining catalysts, in particular to a low-energy-consumption method for comprehensively recovering a waste hydrogenation catalyst. The method comprises the following steps: firstly, carrying out vacuum pyrolysis on the waste hydrogenation catalyst to obtain heavy oil and a deoiled waste catalyst; then the deoiled waste catalyst is smashed and then subjected to oxidizing roasting to remove sulfur and carbon in the waste catalyst, and roasted clinker is obtained; carrying out acid leaching and solid-liquid separation on the roasted clinker to obtain a leaching solution and leaching residues; wherein valuable metal ions in the leachate are respectively recovered by using a solvent extraction method; and after leaching residues are subjected to secondary leaching through sodium hydroxide, aluminum in the leaching residues is recycled, and a sodium metaaluminate solution is obtained. According to the technical scheme, selective recovery of molybdenum, vanadium, nickel and aluminum in the waste hydrogenation catalyst can be achieved, the recovery rate is high, energy consumption is low, pollution of the waste hydrogenation catalyst to the environment can be relieved, and sustainable utilization of non-ferrous metal resources can be achieved.

The invention relates to a sodium electrode layered oxide and a preparation method and application thereof. The sodium electrode layered oxide comprises a positive electrode material and a coating layer on the particle surface of the positive electrode material, the coating layer comprises perovskite and sodium metaaluminate. The sodium electrode layered oxide provided by the invention has a uniform composite coating layer comprising perovskite and sodium metaaluminate, and by combining interface gradient doping, the cycling stability of a positive electrode material under high voltage can be remarkably improved.

The invention discloses a preparation device of pseudo-boehmite, which relates to the technical field of chemical equipment and comprises a reaction kettle, an electrode column, a grating and a stirring shaft. The invention also discloses a preparation method of the pseudo-boehmite preparation device. The preparation method comprises the following steps: material addition, colloid generation, aging, gibbsite conversion and repeated charging. The inner kettle and the outer kettle are arranged, a sodium aluminate solution and carbon dioxide are subjected to a neutralization reaction in the inner kettle to generate pseudo-boehmite colloid, part of gibbsite generated due to slow reduction of the pH value in the reaction process is precipitated at the bottom end of the inner kettle, and the pseudo-boehmite colloid can directly enter the outer kettle to be subjected to aging treatment after being generated; gibbsite can be heated at the bottom end of the inner-layer kettle to be converted into monohydrate gibbsite, and the monohydrate gibbsite can enter the outer-layer kettle along with subsequent pseudo-boehmite to be aged, so that the gibbsite can be directly converted and recycled in the preparation process of the pseudo-boehmite.

The invention provides a preparation method of pseudo-boehmite with high bulk specific gravity, and belongs to the field of pseudo-boehmite. The method comprises the following steps: carrying out a low-temperature neutralization reaction on an aluminum salt solution and a sodium metaaluminate solution, and keeping the pH value of a neutralized material at 6-6.5 in the reaction process to obtain amorphous precursor slurry; carrying out solid-liquid separation on the amorphous precursor slurry to obtain first mixed slurry; performing high-temperature aging crystal transformation reaction on the first mixed slurry and sodium carbonate to obtain macroporous pseudo-boehmite slurry; performing solid-liquid separation on the macroporous pseudo-boehmite slurry to obtain second mixed slurry; carrying out modification treatment on the second mixed slurry and acid or acid aluminum salt so as to re-agglomerate the non-peptized macroporous pseudo-boehmite to obtain third slurry; performing solid-liquid separation on the third slurry to obtain fourth mixed slurry; and carrying out spray drying on the fourth mixed slurry to obtain the pseudo-boehmite. Therefore, the bulk density of the pseudo-boehmite is improved.

The invention discloses a fast ion conductor coated sodium ion battery manganese-based positive electrode material and a preparation method thereof, and belongs to the technical field of sodium ion battery positive electrode materials. The method comprises the following steps: S1, synthesizing a Zn < x > Mg < y > Mn < 1-x-y > CO < 3 > precursor based on a coprecipitation reaction; s2, carrying out coating modification on the precursor by using an aluminum source; and S3, roasting the coated modified precursor and a sodium source at high temperature to obtain the fast ion conductor coated sodium ion battery manganese-based positive electrode material. According to the material, a co-doped precursor material is obtained by doping zinc and magnesium elements in a manganese-based oxide at a precursor end, the doping of zinc and magnesium enables the material to have a wide lattice spacing, and the diffusion barrier of Na < + > in the charging and discharging process is reduced; sodium metaaluminate formed on the surface of the material is uniformly distributed, so that the direct reaction between the positive electrode material and electrolyte in the charging and discharging process is inhibited; and meanwhile, the fast ion conductor coating layer can also improve the ionic conductivity of the material and improve the rate capability.

The invention discloses a high-salt-content wastewater crystal. The high-salt-content wastewater crystallization comprises the following steps: S1, pretreatment: wastewater in a system enters a homogeneous regulation tank in S1, water is discharged from the homogeneous regulation tank to a high-density tank 1 #, PAC, PAM, lime sodium carbonate and NaOH are added into the high-density tank 1 # for reaction, water is discharged from the high-density tank 1 # to a high-density tank 2 #, PAC, PAM and sodium metaaluminate are added into the high-density tank 2 #, water is discharged from the high-density tank 2 # to a high-strength membrane tank, and water is discharged from the high-strength membrane tank to a two-stage weak acid cation bed; s2, evaporative crystallization: the concentrated water in the concentrated water feeding tank enters a triple-effect mixed salt evaporative crystallization device to separate out mixed salt of sodium chloride and sodium sulfate and part of carnallite. The high-salt-content wastewater crystal provided by the invention can achieve the purposes of salt separation and zero discharge, and recycling and reusing of produced water and saltpeter, and also realizes recycling of produced reclaimed water and resource reutilization of produced sodium sulfate and sodium chloride as industrial raw materials.

The present invention discloses a non-fired γ-C2S phosphogypsum lightweight aggregate, and its components and their mass percentages are as follows: phosphogypsum 43-68%, γ-C2S 12-28%, fly ash 5-10%, mineral powder 5-10%, red mud powder 3-6%, sodium metaaluminate 1-3%, water 5-7%; First, the weighed phosphogypsum, γ-C2S, mineral powder, fly ash, red mud powder, sodium metaaluminate and water are stirred and mixed; Then, through step-by-step pressing, crushing, rounding treatment and screening, aggregate blanks are obtained; Finally, they are cured in saturated lime water to obtain the product. The γ-C2S phosphogypsum lightweight aggregate obtained by the present invention has a low self-weight and high strength, can realize the high-value resource utilization of industrial wastes such as phosphogypsum, and has significant environmental and economic benefits.

The invention discloses a carbide slag fly ash concrete aerated block and a preparation method thereof, and belongs to the technical field of resource utilization of building materials and solid waste. The aerated block comprises the following raw materials: carbide slag, fly ash, gypsum, Portland cement, aluminum powder paste, a nano core-shell structure calcium-aluminum-silicon polymer and a zwitterionic foam-stabilizing polymer, the raw materials have a specific weight part range. Wherein the nano core-shell structure calcium-aluminum-silicon polymer is prepared by dispersing fly ash in water to form slurry, reacting the slurry with sodium silicate and a sodium metaaluminate solution in sequence, then adding calcium nitrate and a zinc sulfate solution for continuous reaction, and carrying out separation, washing, drying and grinding; the zwitterionic foam-stabilizing polymer is prepared by polymerizing a monomer in a solvent, precipitating and separating out, quaternizing, activating carboxyl crosslinking, dialyzing and purifying, and freeze-drying. All the steps relate to process parameters such as dry mixing time, stirring time, curing temperature, pressure and time, and the performance of the aerated block is improved through component optimization and preparation process improvement.

The invention belongs to the technical field of catalyst carrier materials, and particularly relates to a preparation method of mesoporous ultra-stable aluminum oxide. Pseudo-boehmite is prepared by adopting a double-aluminum method, alumina powder is obtained after roasting, a layer of fibrous pseudo-boehmite is prepared in the pore structure of the alumina powder, and the pore structure and the specific surface area of mesoporous super-stable alumina are controlled by controlling the crystallization pH value and the crystallization temperature in the reaction process. Sodium silicate and hexamethyldisilazane are added in the preparation process, so that the high-temperature stability of the mesoporous super-stable aluminum oxide is effectively improved, and the mesoporous super-stable aluminum oxide still has good specific surface area and pore volume under a hydrothermal condition. The mesoporous stable alumina is prepared by taking sodium metaaluminate and aluminum sulfate as main raw materials, and an organic solvent is not added as a template agent in the preparation process, so that volatilization of the organic solvent is effectively avoided, and the mesoporous stable alumina is green and environment-friendly.

The invention discloses a dechlorinated and detoxified fly ash-waste glass powder-slag composite alkali-activated cementing material and a preparation method thereof. The alkali-activated cementing material takes hydrated calcium aluminosilicate gel and hydrated sodium aluminosilicate gel as main components, and comprises the following raw materials: dechlorinated and detoxified fly ash, waste glass powder, slag and an alkali activator, and the alkali activator is prepared from a sodium silicate solution and a sodium hydroxide solid; the raw materials are scientifically proportioned, so that efficient resource utilization is realized, and the performance of the alkali-activated cementing material is improved. The selected precursor is rich in active mineral components such as calcium, silicon and aluminum, an alkali activator prepared by adding a sodium silicate solution and a sodium hydroxide solid provides an ideal alkaline environment for a system, and the system can generate C-A-S-H gel and N-A-S-H gel at the same time due to complementary and synergistic effects of chemical components of all the components. Therefore, the material properties of high compressive strength, moderate setting time and reaction heat balance are realized, and meanwhile, good working performance and long-term durability are realized.

The invention provides a zinc-copper-nickel-copper smelting deslagging agent and a preparation method and a use method thereof. The zinc-copper-nickel-copper smelting deslagging agent comprises the following raw materials in percentage by mass: 5-15% of calcium fluoride, 20-30% of sodium carbonate, 5-15% of sodium fluoride, 10-20% of sodium hexafluoroaluminate and the balance of borax. Compared with the prior art, the zinc-copper-nickel-copper slag remover prepared by mixing the raw materials can effectively reduce impurities to be less than 0.14% of Fe, less than 0.005% of Pb and less than 0.003% of Si in the smelting process, the impurity components are obviously reduced, the number of times of component adjustment and unqualified sampling is reduced, impurities mixed in a casting blank are reduced, and finally the metal purity and the casting quality are improved. Meanwhile, loss of zinc and nickel is reduced to the maximum extent; and adverse effects on the zinc-copper-nickel alloy are avoided.

The invention discloses a preparation method of an adsorption material for catalytic combustion of VOCs, and belongs to the technical field of environment-friendly catalytic materials. The method comprises the following steps: mixing silica sol, kaolin and an HZSM-5 molecular sieve according to a mass ratio of 1: (0.6-0.8): (0.4-0.5), and pulping to form slurry with the solid content of 25%-40%; adding polyethylene glycol (the molecular weight is 300-600) which accounts for 1-5% of the mass of the slurry, and uniformly dispersing; dripping into an oil phase at the temperature of more than or equal to 70 DEG C through a 0.5-1 mm dropper to form a 1-2 mm gel bead; pre-drying for 2-4 hours at the temperature of 80-120 DEG C, heating to 600-750 DEG C at the speed of 3-5 DEG C / min, and roasting for 2-5 hours; and the roasted pellets, sodium metaaluminate, a guiding agent and water are subjected to dynamic crystallization according to the mass ratio of 1: (0.1-0.3): (0.05-0.15): (5-10), and finally metal is loaded. The sphericity of the carrier is gt under the synergistic effect of oil column forming and polyethylene glycol; the compressive strength is not less than 40 N; the kaolin enhances the mechanical performance, and the HZSM-5 constructs hierarchical pore channels (the pore volume is 0.3-0.5 cm / g, and the specific surface area is gt and 300 m / g), so that the VOCs adsorption capacity is improved.

The invention discloses a method for accurately measuring the content of soluble suspended matters in a sodium aluminate solution, which comprises the following steps: (1) taking two parts of sodium aluminate solution in an aluminum oxide production process as two parts of samples, and keeping the temperature, the two parts of sodium aluminate solution being equal in amount; (2) filtering one sample to obtain filtrate and suspended matters; (3) adding ultrapure water into the other part of the sample, diluting to obtain a diluent, heating the diluent to 60 DEG C, stirring while heating until the solution is clarified, and then filtering to obtain filtrate and solid residues; (4) further comprising the following steps: a, drying the suspended matters in the step (2), weighing to obtain the total amount of the suspended matters, drying the solid residues in the step (3), and weighing to obtain the mass of insoluble suspended matters; calculating the content of the soluble suspended matters by adopting the following formula: the mass of the soluble suspended matters = the total amount of the suspended matters-the mass of the insoluble suspended matters; according to the method, the content of the soluble suspended matters in the sodium aluminate solution is accurately measured.

The invention provides a method for synergistically preparing calcium fluoride and a molecular sieve based on multi-element industrial waste, and belongs to the technical field of industrial waste recycling. The method comprises the following steps: respectively taking an electrolytic aluminum industry byproduct fluorine-containing waste electrolyte cryolite and lithium slag after lithium extraction of lithium ore as raw materials, performing acid leaching on the electrolyte cryolite, adding a calcium compound, separating to obtain calcium fluoride solid and a mixed solution containing aluminum chloride and sodium chloride, and adding an alkaline solution into the mixed solution to obtain an aluminum hydroxide product. And carrying out alkaline leaching on the lithium slag to obtain a mixed solution containing sodium silicate and sodium metaaluminate, and proportionally synthesizing the mixed solution with the obtained aluminum hydroxide and sodium hydroxide solution to obtain the 4A zeolite molecular sieve product. The calcium fluoride and the zeolite molecular sieve are cooperatively prepared by adopting multi-element industrial waste, and the problems that electrolyte cryolite cannot be completely applied to the aluminum electrolysis process, the lithium slag treatment cost is high and the like in the prior art are solved.

The invention discloses a method for comprehensively recycling electrolytic aluminum carbon residues, and relates to the technical field of comprehensive recycling of waste materials. The method for comprehensively recycling the electrolytic aluminum carbon residues comprises the following steps of: breaking the carbon residues into 0.1-1cm particles by a hammer, carrying out wet ball milling under the condition of adding a flotation agent, and separating carbon powder on the upper layer and gray regenerated cryolite on the bottom layer of slurry through flotation equipment, wherein the fineness is 40-100 meshes, and the carbon content is less than 1%; the preparation method comprises the following steps: adding water into cryolite to prepare slurry, adding calcium oxide or calcium hydroxide, heating, stirring and reacting for 1-3 hours, and carrying out filter pressing to obtain filtrate and filter residues which are calcium fluoride and a sodium metaaluminate solution; the purity of the calcium fluoride powder is greater than 85%; and introducing hydrochloric acid into the filtrate, stirring and adjusting the pH to 7-9 to obtain aluminum hydroxide slurry, filtering and washing to obtain aluminum hydroxide, and drying to obtain the aluminum hydroxide with the purity of more than 95%.

According to the method, sodium carbonate, limestone and coke are used as sintering aids and are uniformly mixed with the high-iron Bayer process red mud, the mixed material is sintered by adopting a one-step low-calcium reduction sintering process, and the sintered clinker is subjected to water leaching and dissolution to obtain a sodium aluminate crude solution and filter residues. And returning the sodium aluminate crude liquid to an aluminum oxide industrial production line to prepare aluminum oxide, and carrying out a hydrolysis alkali recovery process on filter residues to obtain industrial sodium carbonate. The hydrolysis residues are subjected to magnetic separation and recovery to obtain fine iron powder, and the remaining tailings are completely harmless and can be used as raw materials of building materials or used for soil backfilling. The process is characterized in that the one-step low-calcium reduction sintering temperature is 200-300 DEG C lower than the sintering temperature of a sintering method, and the energy consumption is low; na2CaSiO4 is a sintering target product, Ca2SiO4 generally generated by a traditional sintering method is not generated, the situation that Ca2SiO4 is hydrolyzed in the water leaching process to inhibit dissolution of aluminum oxide is avoided, and the recycling rate of aluminum oxide is increased while the using amount of limestone is greatly reduced. The technological process is simple, efficient, energy-saving and free of three-waste emission, and the method is a novel method capable of treating the high-iron red mud in a large-scale and reduction mode.

Disclosed is a process for preparing a high silica Y-zeolite by utilizing a waste silica source. The method comprises the following steps: preparing a dilute nucleating agent, and preparing a thick nucleating agent by mixing sodium silicate, sodium aluminate, deionized water and sodium hydroxide. Furthermore, an aluminosilicate gel is prepared by mixing the dilute nucleating agent with sodium silicate, aluminum sulfate, deionized water and the thick nucleating agent, and then the aluminosilicate gel is crystallized, filtered and washed to obtain a Y-zeolite filter cake. The Y-zeolite is ammonium exchanged, dried and calcined to obtain a high silica Y-zeolite.

The present invention provides a fluorine-containing accelerator and a preparation method thereof, relating to the technical field of accelerator preparation. The fluorine-containing accelerator comprises the following weight percentages: liquid sodium aluminate: 8-15%; aluminum sulfate: 40-50%; fluoride salt: 6-9%; alcoholamine: 4-8%; and water: 25-32%; the sum of these components being 100%. The fluorine-containing accelerator does not produce particle precipitation during preparation, making the preparation process easy to operate.