21 results about "Dealkalization" patented technology

This invention discloses a lithium slag dealkalization treatment agent and a method for the resource utilization of lithium slag in building materials, comprising the following raw materials in parts by weight: 50-80 parts sodium hydroxide, 30-50 parts water glass, 5-15 parts polycarboxylate superplasticizer, and 10-20 parts calcium carbonate. This invention has the advantage of being environmentally friendly and solves the problems of existing lithium slag resource utilization methods, such as the inconvenience of preparing high-strength, high-insulation building materials from waste lithium slag, insufficient strength of lithium slag building materials making them unsuitable for load-bearing structures or high-load scenarios, limiting their use to low-strength filler materials or non-structural components, significantly reducing their economic value, and poor insulation performance failing to meet energy-saving building standards, resulting in a lack of competitiveness in scenarios requiring thermal insulation such as walls or roofs.

The application discloses a kind of red mud gradient depth purification-rare earth-radioactivity synergistic target purification method, by " hierarchical pretreatment and microwave modification→three-stage gradient dealkalization→rare earth-radioactivity synergistic target purification→full quantization recycling" four-stage integrated process, realize red mud harmless and high-value utilization.The three-stage gradient dealkalization uses microwave-CO2-biological synergic system, after dealkalization pH≤8.0, Na2O content<1%;Rare earth-radioactivity purification is extracted by HDES and coupled with multi-ligand magnetic material system, light rare earth recovery rate≥95%, middle heavy / rare earth recovery rate≥90%, U / Th removal rate≥95%;Full quantization recycling realizes red mud total utilization rate≥98.5%, wastewater reuse rate≥95%, every ton of red mud fixed CO2≥0.2 tons.The application is suitable for various high-alkali, containing radioactive and rare earth red mud treatment, with environmental benefits and economic benefits.

The invention discloses a process for dealkalizing and deeply reducing red mud through gradient temperature control treatment, which comprises the following steps: 1) accurately metering raw materials and grinding; 2) feeding the ground raw materials into a red mud stirrer, and stirring at a gradient rotating speed; 3) feeding the stirred and mixed raw materials into a granulator for granulation, and pressing the materials into particle materials with the particle size of 5-15mm; 4) feeding the particle material into a dealkalization solid-phase reaction device, and forming a particle material after a solid-phase reaction in a reducing atmosphere; (5) feeding the particle material after the solid-phase reaction into a cooling machine, and slowly cooling in a furnace by adopting a nitrogen direct circulating cooling method; 6) crushing the cooled material by a crusher until the particle size is less than 5mm; 7) performing magnetic separation on the ground powder by a high-gradient magnetic separator.According to the method, efficient dealkalization and iron element reduction separation are realized through high-temperature dealkalization pre-reduction and high-temperature deep reduction melt separation.

The invention discloses microwave activated red mud-biomass solid waste magnesium oxychloride aggregate and a circulation method, and belongs to the technical field of solid waste recycling and negative carbon building materials. The method comprises the following steps: mixing Bayer process red mud and biomass solid waste according to a mass ratio of 3: 1-1: 1, and carrying out microwave activation at 500-1200 DEG C for 10-60 minutes; carrying out magnetic separation on the activated material to obtain an iron ore concentrate-biomass charcoal composite material which can be used as a wave-absorbing material, so as to obtain low-alkali activated red mud residues; 10-50 parts of the residues, 15-40 parts of light calcined magnesia powder and 15-40 parts of a magnesium chloride solution are mixed, the molar ratio of magnesium oxide to magnesium chloride is 6-9, and solid waste aggregate is obtained after forming and curing; the waste aggregate is regenerated into active powder after being subjected to heat treatment at 400-800 DEG C for 0.5-2 hours, and new aggregate can be circularly prepared. According to the method, red mud dealkalization and iron recovery, high-value utilization of biomass and carbon sequestration and stability augmentation and closed-loop circulation of aggregate are synchronously realized.

The invention relates to a method for preparing calcium aluminate by using alkaline residues, which comprises the following steps: adding an induced settling agent into alkaline residue slurry to promote the growth of calcium carbonate crystal grains in the alkaline residue slurry and further promote the settling of calcium carbonate, aluminum calcium carbonate and other products so as to facilitate subsequent better solid-liquid separation; carrying out dealkalization type liquid-solid separation treatment on the sedimentation liquid to obtain low-sodium modified alkaline residues and catalytic filtrate; reacting the catalytic filtrate with aluminum ash to obtain sodium aluminate, ammonia gas, methane and hydrogen; then carrying out solid-liquid separation to obtain modified aluminum ash with less leached fluorine and less volatile ammonia; and preheating and calcining the modified alkaline residues and the modified aluminum ash to obtain a target calcium aluminate product. The preparation method provides a thought for preparing high-quality calcium aluminate from the alkali residues discharged in the Bayer process aluminum oxide production process.

The invention discloses fly ash-red mud based ultrafine powder and a preparation method and application thereof.The fly ash-red mud based ultrafine powder is prepared from, by weight, 50-70 parts of modified fly ash, 10-35 parts of dealkalized red mud, 4-10 parts of waste glass micro powder and 4-10 parts of nanometer silicon-aluminum sol, the dealkalized red mud is prepared from red mud through calcination-secondary leaching. The fly ash-red mud-based ultrafine powder prepared by the invention can replace S95-grade mineral powder, is remarkably better in working performance, mechanical property and durability after being used for preparing sea sand concrete, can effectively prolong the service life of marine environment concrete engineering while reducing the production cost of the sea sand concrete, and has higher engineering application value.

The invention relates to the technical field of mine filling materials, in particular to an alkali-activated red mud filling material and a preparation method and application thereof. The invention provides an alkali-activated red mud filling material, which is prepared from the following raw materials in parts by weight: 70 to 90 parts of red mud, 10 to 20 parts of a dealkalizing agent, 1 to 3 parts of a dealkalizing-coagulating aid, 10 to 30 parts of an auxiliary cementing material, 0.1 to 0.5 part of a retarder, 0.1 to 0.3 part of a water-retaining agent and 0.1 to 0.3 part of an interface reinforcing agent, wherein the weight part of the red mud is the weight part of the dry basis red mud. The alkali-activated red mud filling material prepared by adopting a method combining a dealkalization technology and an alkali-activated technology provided by the invention is faster in coagulation, higher in compressive strength and lower in bleeding rate, meanwhile, the preparation method solves the problems that a large amount of red mud is high in dealkalization cost and difficult to fully utilize after dealkalization, and has great practical application value.

The invention belongs to the technical field of red mud solid waste treatment, and particularly discloses a strong-basicity red mud-based directional dealkalization environment-friendly filling material and a preparation method thereof. The red-mud-based environment-friendly filling material provided by the invention comprises the following components: red mud, cement, a biomass organic acid modifier and water. The preparation method comprises the following steps: inputting the red mud into a paste storage thickener; mixing the thickened red mud, cement and water, and stirring to obtain initial slurry; adding a biomass organic acid modifier, and continuously stirring to obtain slurry; and filling and curing to obtain the red-mud-based environment-friendly filling material. The invention provides a directional dealkalization technology taking biomass-based organic acid as a core neutralizer, silicon-aluminum activity of the red mud is synchronously activated, auxiliary cementing materials such as slag are not needed, the superiority of biomass-based dealkalization is verified through experimental data, and three targets of dealkalization environmental protection, strength standard reaching and waste treatment with waste are achieved.

The invention discloses a method for removing sodium and potassium in red mud by using a ferric sulfate solution, and belongs to the technical field of industrial solid waste treatment and recycling. The method for removing the sodium and the potassium in the red mud by using the ferric sulfate solution comprises the following steps: mixing the ferric sulfate solution with the red mud, carrying out dealkalization treatment, and then carrying out solid-liquid separation to obtain dealkalized red mud and dealkalized leachate, so as to complete removal of the sodium and the potassium in the red mud. Compared with a traditional acid neutralization method which directly uses inorganic acid or organic acid as a raw material, the method has the advantages that the acid in the dealkalization process comes from Fe < 3 + > hydrolysis; when H < + > is consumed in the dealkalization process, hydrolysis balance of Fe < 3 + > moves to continuously supplement H < + >, selective removal of sodium is realized in the dealkalization process, and the content of Na2O in the dealkalized red mud is 1t; 1%. The acid generated by hydrolysis can effectively dissolve sodium-containing silicate, but hardly dissolves aluminum-containing components in the red mud, so that selective dealkalization is realized.

The application discloses a strain with a red mud dealkalization function and application thereof, and the classification name of the BRY1 strain is Acinetobacter baumannii Acinetobacter baumannii , the preservation number of which is GDMCC No 66371, the preservation date is May 22, 2025, and the preservation unit is Guangdong Microbial Culture Collection Center. The BRY1 strain provided by the application has strong alkali resistance and high acid production capacity, and can quickly and effectively neutralize alkaline substances in red mud. The BRY1 strain is obtained by being separated and screened from a specific environment, i.e., a red mud storage yard, and has good adaptability and dealkalization specificity to the red mud environment.

The present application relates to the technical field of comprehensive utilization of solid waste, and particularly relates to an aluminum-silicon solid waste dealkalization and resource system based on lattice distortion, comprising: a dealkalization control module, comprising a pulping unit for converting aluminum-silicon solid waste into a permeable system; a resource recovery module, comprising a separation unit for separating dealkalized solid phase from alkali-containing liquid phase after dealkalization; a dealkalization determination module for determining whether the dealkalization completeness of aluminum-silicon solid waste meets the requirements according to the dealkalization completion rate; a variable pressure mechanism construction module for determining whether to construct a structure disturbance mechanism and determining the alternating pressure difference amplitude according to the alkali metal ion concentration in the leaching solution of the dealkalized solid phase; and a dealkalization environment adjustment module for determining whether to add a low-concentration weak acid solution according to the net release rate of alkali metal ions in the dealkalization process. The present application improves the dealkalization completeness of aluminum-silicon solid waste.

The invention relates to the technical field of cementitious materials, in particular to a multi-element solid waste based cementitious material, a preparation method and application, the multi-element solid waste based cementitious material comprises a multi-element solid waste main material, a composite excitation system, a crystal form regulating agent, a carbon sequestration modification component and a functional modification additive; the multi-element solid waste main material covers various conventional and refractory solid wastes, and the red mud is subjected to dealkalization treatment; the composite excitation system is of an inorganic-organic synergistic type; the crystal form regulating agent directionally induces the hydration product to form an interlaced structure; the carbon sequestration modified component is a compound; the functional modification additive is compounded by graphene oxide and polyether amine, and all the components cooperate to guarantee the performance of the material. The solid waste utilization rate is increased, and the environmental protection pressure and carbon emission are reduced; the composite excitation system guarantees stable strength, the crystal form regulator optimizes the structure to improve durability, the carbon sequestration component realizes carbon sequestration, and the composite excitation system has both environmental protection and economic benefits and meets the low-carbon development demand.

The utility model relates to the technical field of dust ash treatment, especially to a high-zinc dust ash dealkalization zinc enrichment treatment device, when using, granular dust ash is poured into the box and is carried out the crushing operation to the dust ash through the crushing assembly, the dust ash after crushing enters the inside of the box, the inside of the box is provided with the pickling solution and carries out the dealkalization assembly to the dust ash, after the operation is finished, the dust ash solution enters the centrifuge and carries out the solid -liquid separation, improves the processing efficiency, including bottom plate, centrifuge and box, the bottom plate top end is installed with centrifuge and box, still includes crushing assembly and dealkalization assembly, the inside of box is installed with crushing assembly and dealkalization assembly, the dealkalization assembly is linked with centrifuge input end.

The application provides a red mud-based artificial soil and a preparation method and application thereof. The preparation method comprises the following steps: (1) mixing red mud, a calcium source and a sodium aluminate solution to obtain a raw slurry; (2) performing a first hydrothermal reaction on the obtained raw slurry to prepare a first clinker slurry, and obtaining a dealkalized red mud after first solid-liquid separation; (3) mixing the dealkalized red mud, detoxified fly ash and water to perform a second hydrothermal reaction, and obtaining a second clinker slurry; (4) sequentially performing second solid-liquid separation and washing on the obtained second clinker slurry to obtain a soil matrix; and (5) mixing the obtained soil matrix with organic matter and culturing to obtain the red mud-based artificial soil. The first hydrothermal reaction is used for dealkalizing the red mud and recovering alkali, the second hydrothermal reaction is used for solidifying active alkali in the red mud, then the introduction of organic matter increases the content of effective nutrients in the artificial soil and forms a granular structure, and finally the red mud-based artificial soil with good performance is prepared.

The invention discloses a red mud filter pressing and drying treatment process, and belongs to the technical field of industrial solid waste recycling. The process sequentially comprises the steps of activation tempering, flocculation tempering, filter pressing dehydration and drying. The core innovation of the method is as follows: before conventional flocculation, a special chemical activation tempering step is introduced, and acid, calcareous / siliceous or salt activating agents are added into original red mud slurry to chemically react with the red mud, so that deep dealkalization is realized, and mineral phase transformation of the red mud is induced. According to the steps, the strong basicity and stable structure of the red mud are fundamentally changed, the dehydration efficiency of subsequent filter pressing is remarkably improved, the water content of a filter cake is lower, the basicity of the finally obtained red mud product is greatly reduced, the red mud product has potential activity as a building material raw material and other resources, and the key span of the red mud from waste to resources is achieved.

The invention discloses a red mud-based cementing material based on composite accelerator pretreatment and carbonization synergistic dealkalization as well as a preparation method and application of the red mud-based cementing material, and belongs to the technical field of solid waste resource utilization. The preparation method provided by the invention comprises the following steps: mixing red mud, a composite accelerant and water, and carrying out stirring reaction to obtain slurry; the composite accelerant comprises solid waste gypsum, alkaline residues, silicon-aluminum solid wastes and salt residues; introducing CO2-containing gas into the slurry, and carrying out a normal-pressure carbonization reaction to obtain carbonized red mud slurry; and carrying out solid-liquid separation on the carbonized red mud slurry, and drying and grinding a solid product to obtain the red mud-based cementing material. According to the method, the red mud is pretreated by adopting the composite accelerant composed of specific solid waste, and then a subsequent carbonization process is combined, so that the red mud-based cementing material which is stable in performance, free of alkali efflorescence risk and capable of replacing cement is prepared, and meanwhile, collaborative recycling of various industrial solid waste and carbon dioxide is achieved.

The invention discloses a red mud dealkalization process, and relates to the technical field of red mud. According to the method, alkali metal and alkaline earth metal removal of the red mud, efficient and high-valued recovery of valuable elements such as iron, aluminum and titanium and tridilute elements, performance utilization of calcium-based materials, modification and recovery of fine particles of ferric hydroxide and preparation of products such as an iron-carbon sewage treatment agent and silicon dioxide can be achieved, and full-chain utilization of resources is achieved; ammonia gas and acid-base reagents are recycled, hydrogen reduction furnace tail gas waste heat and four-stage fluidized bed heat are recycled in a gradient mode, energy consumption is low, secondary pollution is avoided, the process is stable and suitable for industrialization, and the problem of red mud stockpiling is solved.

The application discloses a method for removing alkali from red mud, which comprises the following steps: crushing and drying red mud raw materials, passing the dried red mud through a 200-mesh sieve; mixing the dried red mud with an additive and calcining the mixture, and obtaining calcined slag after cooling; putting the calcined slag into a magnetic separation tube and then into a physical iron separation process; refining the iron-containing crude slag and selling the refined slag as a product; adding the iron separation tailings into a sodium hydroxide solution for alkali leaching, and performing solid-liquid separation after the alkali leaching is completed; performing aluminum precipitation treatment on the alkali leaching solution to obtain aluminum precipitation mother liquor and an aluminum oxide product; adding a buffer solution to the alkali leaching tailings to adjust the pH of the leaching solution, and obtaining solid slag and filtrate after solid-liquid separation; mixing the filtrate with the aluminum precipitation mother liquor to recover a sodium carbonate product; and drying the solid slag after water washing to obtain an alkali-removed sample, which can be used as a cement raw material. The method for removing alkali from red mud is simple, efficient, short in cycle, and capable of treating red mud in batches without generating waste slag, and can be widely used.

The invention discloses a humic acid reinforced red mud dealkalization and heavy metal stabilization treatment method which comprises the following steps: soaking red mud in a polyethylene glycol aqueous solution, and filtering to obtain polyethylene glycol loaded red mud; roasting the red mud loaded with the polyethylene glycol to remove the polyethylene glycol in the red mud; soaking the roasted red mud in an acid solution, filtering and drying to obtain dealkalized red mud; and mixing the humic acid and the dealkalized red mud to obtain the product. According to the treatment method, the red mud can be dealkalized, the pH value of the red mud can be reduced, meanwhile, heavy metal ions can be fixed, and the treated red mud can be used for soil regulation and control and plant growth promotion.

The invention discloses an in-situ dealkalization and ecological matrix layer construction method for a red mud storage yard, and belongs to the field of solid waste recycling. A percolation and reflux reaction system integrating biological acid production, forced circulation neutralization and in-situ humic soil formation is constructed on the surface layer of the red mud storage yard; acidic leachate generated by oxidizing pyrite solid waste by using sulfur-oxidizing bacteria uniformly permeates and neutralizes the alkalinity of lower-layer red mud under forced reflux power; in combination with in-situ degradation of biomass waste, reagglomeration and physicochemical property curing of red mud particles are realized through subsequent stirring and mixing; according to the invention, the problems of non-uniform reaction, low efficiency and lack of organic matters in the traditional remediation are solved, and the ecological matrix improvement of the red mud under the condition of treating wastes with wastes is realized.