106 results about "Alkali activated slag" patented technology

The present invention belongs to the field of resource utilization of building materials and solid waste, and relates to a red-mud-based cementing material based on efficient drying, component homogenization and activity improvement, and a preparation method therefor. The preparation method comprises: adding a filter aid to red mud to carry out sedimentation, then subjecting same to filter pressing until the water content is 14-16%, then drying the solid material, which has been subjected to filter pressing, until the water content is 4% or below, and finally grinding same to obtain the product. The filter aid comprises the following raw materials: 10-30 parts of polyaluminum chloride, 5-15 parts of polyaluminum sulfate, 1000-1200 parts of blast furnace slag or fly ash, 700-900 parts of steel slag, 400-600 parts of carbide slag or alkaline residues, and 300-400 parts of desulfurized gypsum or phosphogypsum or fluorgypsum. By means of the present invention, the dehydration efficiency of red mud can be improved, the red-mud-based cementing material can also be prepared in one step; the preparation process for the red-mud-based cementing material is simplified; and the prepared red-mud-based cementing material has the advantages of a high mechanical strength, high durability and erosion resistance.

The invention discloses a cementing material for a solid waste-based road of a coal-fired power plant and a preparation method of the cementing material. The cementing material mainly comprises a cementing component, an alkali-activated component and a reinforcing component, the gelling component is a mixture of coal-fired power plant fly ash and furnace slag; the alkali-activated component is a mixture of alkali residues, red mud, blast furnace slag and coal-fired power plant desulfurized gypsum; the reinforcing component is rice hull ash or peanut hull ash. The mass ratio of the gelling component to the alkali-activated component is (4 / 1)-(10 / 1); and the addition amount of the reinforcing component is 1-3% of that of the main body material. The coal-fired power plant solid waste fly ash, the furnace slag and the desulfurized gypsum are used as main bodies, a small amount of other industrial solid waste is added, and the cementing material belongs to a full-solid-waste low-carbon cementing material and can be applied to a road base, a subbase or a base layer. The invention has the characteristics of low carbon emission, high solid waste consumption, simple production process and strong pavement performance, and in addition, the invention has a good stabilization effect on the problem that part of solid waste heavy metals and sulfate ions in a coal-fired power plant exceed the standard.

The invention discloses a preparation method of a mine filling material based on iron-rich solid waste and the obtained material.The preparation method comprises the steps that 5-30 parts by mass of steel slag powder, 40-50 parts by mass of copper slag powder, 5-20 parts by mass of red mud, 25-50 parts by mass of ferronickel slag powder, 10-12 parts by mass of carbide slag and 10-12 parts by mass of alkaline residues are subjected to dry mixing; then adding 10-15 parts by mass of water glass, 5-10 parts by mass of a water reducing agent, 5-10 parts by mass of a foaming agent and 10-40 parts by mass of water, mixing and stirring, and finally adding 100-250 parts by mass of tailings, and stirring again to obtain the mine filling material. According to the invention, various industrial wastes are utilized as resources and completely replace traditional cement raw materials, so that the production cost and carbon emission of the mine filling material are remarkably reduced, and the prepared mine filling material is good in compressive strength and improved in mechanical property.

The invention relates to the field of resource recycling, and discloses an iron slag ash and waste soil composite curing agent as well as a preparation method and application thereof. The composite curing agent comprises the following components in parts by weight: 30-50 parts of iron slag ash; 20 to 40 parts of waste soil; 10-20 parts of industrial alkaline residues; 5-10 parts of a functional auxiliary agent; 3-5 parts of a curing synergist; the curing synergist is composed of an inner core and a coating layer, the inner core material comprises a porous carrier and an exciting agent, and the film forming material of the coating layer is one or more of stearic acid, paraffin and polyethylene wax; the weight ratio of the core material to the coating layer material is (8-9): 1. According to the composite curing agent, resource utilization of waste is achieved, the material cost is remarkably reduced, and the composite curing agent is particularly suitable for flow-state backfilling, light filling and sludge in-situ curing and has remarkable environmental protection and economic benefits.

The invention relates to the technical field of cementing materials, in particular to a green high-performance solid-waste-based cementing material as well as a preparation method and application thereof. The green high-performance solid waste-based cementing material is prepared from the following raw materials in parts by weight: 15 to 25 parts of cement clinker, 15 to 25 parts of desulfurized gypsum, 0 to 5 parts of quick lime, 50 to 60 parts of superfine slag powder, 0 to 18 parts of red mud, 0 to 10 parts of manganese slag, 0 to 10 parts of carbide slag, 0 to 15 parts of fly ash, 0 to 10 parts of alkaline residue and 0 to 2 parts of exciting agent. According to the preparation process of the material, effective utilization of solid waste is realized, efficient resource conversion of the solid waste is promoted, and carbon dioxide emission in the high-energy-consumption clinker production process is remarkably reduced; other industrial wastes can be solidified in the production process, heavy metal polluted soil and wastewater are treated, energy consumption and pollution emission are reduced, and sustainable development of the building industry is facilitated.

The invention discloses a method for increasing the recovery rate of lead fire refining alkaline residues. The temperature of the roasting furnace is set to be 580-650 DEG C, after the actual temperature reaches the set temperature, the refined alkaline residues are conveyed into the roasting furnace, the rotating speed of the roasting furnace is controlled to be 0.5-1 circle / min, the amount of blown air is 2-5 m < 3 > / min, the materials are subjected to oxidizing roasting in the roasting furnace for 30-60 min, the temperature is reduced to 30-50 DEG C, and roasted sand materials are obtained; detecting the roasted product material to obtain the content of the S element; the roasted sand materials and corresponding auxiliary materials are put into a smelting furnace in batches, the temperature in the furnace is controlled to be 900-1100 DEG C, the smelting time is 2-3 h, and produced lead bullion is discharged after the smelting time is up; the auxiliary materials are prepared according to the input amount of a single-batch roasted product material and the content of the S element. The recovery rate of lead, tin, antimony and copper in the pyrorefining alkaline residues can be effectively increased, and the cost of smelting auxiliary materials is reduced.

The invention discloses a mixing design-based ratio optimization method for a multi-source solid waste cementing material containing alkaline residues, which is used for optimizing to obtain an optimal ratio of five solid waste components according to a preset cementing material performance target, the alkaline residues are used as an alkaline excitation component, a D optimal mixing design method is adopted to determine a test point, a three-order normative polynomial model is established, and the optimal ratio of the five solid waste components is obtained. Setting constraint conditions of each solid waste component, testing the three-day compressive strength and 28-day compressive strength of the neat paste for each test point, obtaining a first fitting model based on compressive strength response and a second fitting model based on response according to test data, and according to a preset performance target, the first fitting model and the second fitting model, calculating the compressive strength of the neat paste according to the first fitting model and the second fitting model. Solving through a multi-objective optimization algorithm to obtain an optimal proportion of five solid waste components; according to the method, the problems of low efficiency and high cost of a traditional trial and error method are solved, and scientization and standardization of the proportion design of the multi-source solid waste cementing material are realized.

The invention discloses a mixed roadbed filler prepared by compounding and cooperating multi-source solid waste materials with shield muck. The mixed roadbed filler is prepared from the following raw materials in parts by mass: 100 parts of shield muck, 3 parts of carbide slag / lime, 0-3 parts of fly ash, 0-3 parts of alkaline residues and 0-3 parts of desulfurized gypsum, according to the mixed roadbed filler, lime / carbide slag is used as a curing agent, fly ash, alkaline residues and desulfurized gypsum are used as additives, and a mixture with good strength and durability is formed after uniform stirring and compaction. The mixed filler is applied to roadbed backfilling, so that the shield muck and bulk solid wastes are recycled, and the mixed filler has important social and economic significance in reducing occupation of scarce land resources caused by industrial waste accumulation, reducing environmental pollution hazards and saving construction cost, and is simple in preparation engineering, easy in raw material obtaining and suitable for large-scale popularization and application. And popularization in engineering practice is facilitated.

The invention discloses a high-water-content large-dosage titanium gypsum-based flow-state curing material as well as a preparation method and application thereof, and belongs to the technical field of industrial solid waste resource utilization and building materials. According to the material, 50-70 parts of titanium gypsum, 15-30 parts of slag / fly ash and 5-15 parts of alkaline residue / carbide slag are used as main raw materials, and 0.1-1 part of xanthan gum is used as a flow state regulator as an auxiliary material. The material has high fluidity and self-compaction performance, the mechanical strength (7-day compressive strength is larger than or equal to 5 MPa) and the water stability (the water stability coefficient is larger than or equal to 0.7) of titanium gypsum can be remarkably improved, and meanwhile the leaching concentration of solidified heavy metal ions is lower than a standard value. The preparation method comprises the processes of raw material pretreatment, dry mixing, wet mixing and maintenance, is suitable for the fields of roadbed filling, building 3D printing, mine backfilling and the like, and realizes collaborative development of solid waste recycling and low-carbon building materials.

The invention provides homologous and isomeric alkaline residue-based fluidized stabilized soil as well as a preparation method and application thereof, and belongs to the technical field of solid waste resource utilization. The alkali residue-based curing agent is prepared from the alkali residue after filter pressing, the slag, the desulfurized fly ash, the fly ash and the cement. According to the method, high-water-content pasty raw alkali residues, alkali residues obtained after desalination and salt fixation and furnace slag are used as the alkali residue-based matrix soil. The homologous and isomeric alkaline residues are different in structure and form, so that the homologous and isomeric alkaline residues can be used as matrix soil on one hand, and can be used for preparing the curing agent on the other hand, and physical and chemical reaction and particle size matching among different components are promoted and improved, so that the mechanical property of the homologous and isomeric alkaline residue-based fluid-state solidified soil is improved. By adding a proper amount of water and water reducing agent, the fluidity of the homologous isomeric alkaline residue-based fluid-state solidified soil can be adjusted, the construction requirement can be met, and excellent dense pouring performance is achieved.

The invention discloses a multi-source solid waste-based cementing material and a preparation method thereof, and relates to the technical field of solidified organic matter soft soil cementing materials. The cementing material is prepared from the following raw materials: carbide slag, desulfurized fly ash, yellow phosphorus slag, high-activity and high-stability steel slag, modified red mud, alkaline residues, desulfurized gypsum, mineral slag and calcium sulphoaluminate; the high-activity and high-stability steel slag is prepared by carrying out steel slag preliminary stabilization treatment and steel slag excitation activation on liquid steel slag; exciting and activating the steel slag: preparing high-activity and high-stability steel slag from the stabilized steel slag, the modified ettringite particles, aluminum sulfate, a polycarboxylate superplasticizer, hexadecyl triethyl ammonium bromide and potassium hydroxide; the modified red mud is prepared from red mud, magnesium hydroxide, N-methyldiethanolamine, desulfurized fly ash, calcium oxide and a ferric chloride solution; the modified ettringite particles are prepared from polyvinyl alcohol and N-beta-aminoethyl-gamma-aminopropyl trimethoxy silane as a modifying agent. The preparation method comprises the following steps: preparing the modified ettringite particles; according to the multi-source solid waste-based cementing material, the compressive strength and the water stability coefficient of the solidified organic matter soft soil are effectively improved.

The present invention provides a treatment process for efficiently recovering indium from alkali slag, specifically comprising: S1, grinding and screening the alkali slag, and washing it with water to obtain a pretreated alkali slag; S2, placing the pretreated alkali slag into a reaction tank, adding an acid solution, and heating the reaction to obtain an acid leaching solution I; S3, adding the acid leaching solution to hydrogen peroxide for stirring and reacting, stopping the stirring, and allowing it to stand to obtain an acid leaching solution II; S4, adding water to the acid leaching solution II, followed by adding polyacrylamide for dispersion, filter pressing, and reducing with iron powder to obtain high-copper slag and acid leaching solution III; S5, purifying the acid leaching solution III through a reverse osmosis membrane and reducing it with zinc flakes to obtain sponge indium; S6, smelting the sponge indium to cast an indium ingot to obtain crude indium, and electrolytically refining the crude indium to obtain refined indium. The treatment process of the present invention achieves one-time recovery of indium, with a direct recovery rate of indium as high as 95% and a purity of 99.995%. At the same time, the direct recovery rate of copper reaches up to 85%, while all lead remains in the slag mud, achieving the separation of indium from other valuable metals, increasing economic benefits, and having good application prospects.

The invention discloses a roadbed soil curing material based on large-dosage red mud and a preparation method thereof, and the roadbed soil curing material is prepared from the following components in parts by mass: 80-120 parts of red mud, 4-10 parts of steel slag, 15-20 parts of blast furnace slag, 20-30 parts of iron tailings, 5-15 parts of desulfurized gypsum, 10-15 parts of alkaline residue, 5-10 parts of carbide slag, 4-6 parts of industrial sludge, 1-5 parts of salt dealkalizing agent and 1-5 parts of water stability enhancer. The roadbed soil curing material prepared by adopting the method is simple in preparation method, the compressive strength of the silty clay can be improved, the water stability of the silty clay can be effectively improved, the cured silty clay can meet the strength requirement of the roadbed soil, and efficient curing of the silty clay is realized.

The present invention discloses a kind of highway roadbed solid waste alkali residue solidified soil and its construction method, relates to road engineering technology and solid waste utilization technology field, respectively utilizes the microscopic enhancement mechanism of self-made whiskers, combines interface enhancement to form stable chemical bonds and utilizes nano-silica to meet the particle hole filling and synergistic effect, and the remaining holes after dehydration are filled with hydration products, especially silicon-containing hydrogel provides nucleation sites, accelerates product growth, nano-silica high specific surface area promotes C-S-H nucleation, and the two admixture components work together to further improve the compressive strength of solidified soil. Solve the problem that alkali residue itself has the characteristics of large water content, excessive dosage will lead to increased water content of improved soil, difficult compaction during construction, resulting in increased porosity and decreased mechanical properties.

The application discloses high-performance desert sand foam concrete and a preparation method thereof. The concrete comprises the following components in parts by weight: 70 parts of Portland cement, 30 parts of fly ash, 20-100 parts of desert sand, 25-35 parts of salt water, 0.2-0.5 parts of a foaming agent, 5-12 parts of a composite activator, 5-15 parts of alkali-activated metakaolin composite microbeads and 0.5-2 parts of a roughened PET polymer fiber. The composite activator is composed of calcined phosphogypsum, alkali residue, nano silicon dioxide, silica fume and 5% mass concentration polyvinyl alcohol in a weight ratio of (40-50):(30-40):(10-15):(5-10):(10-15). The alkali-activated metakaolin composite microbeads are composed of fly ash floating beads, metakaolin, water glass, sodium hydroxide and deionized water in a weight ratio of 100:(20-30):(15-25):(3-5):(20-30). The application is particularly suitable for a buffer pressure relief filling layer between primary support and secondary lining in a tunnel engineering, thereby effectively reducing high ground stress and stratum load acting on a tunnel lining structure.

The invention relates to a curing agent for high-flow-state solidified soil applied to underwater structure scour pit protection, the high-flow-state solidified soil and application of the high-flow-state solidified soil, and relates to the field of hydraulic engineering materials. The curing agent comprises a powder curing agent and a liquid curing agent, and the mass ratio of the powder curing agent to the liquid curing agent is (5-15): (0.1-0.6); the powder curing agent comprises sulphoaluminate cement, superfine slag powder, fly ash, gypsum powder, plant ash, silica powder, alkaline residues, hydroxypropyl methyl cellulose, polyvinyl alcohol, an exciting agent and a water reducing agent; the liquid curing agent comprises deionized water, sodium methyl silicate, potassium methyl silicate and polydimethylsiloxane. The raw materials of the high-flow-state solidified soil comprise slurry, fine sand and a curing agent. The application refers to the application in underwater structure scour pit protection. The construction method has the advantages in the aspects of underwater construction, scouring resistance, compact filling, bearing and the like, and the constructability, adaptability, durability and safety of the solidified soil in the aspect of underwater structure protection are improved.

The invention discloses a seawater-mixed high-pressure salt corrosion-resistant all-solid-waste anti-seepage grouting material and a preparation method thereof. The high-pressure salt corrosion-resistant all-solid-waste anti-seepage grouting material can adapt to a high-salt and high-pressure environment. In addition, the adopted raw materials are almost zero in cost, solid raw materials are all taken from solid wastes, and solid waste recycling is achieved; strong alkaline leachate of an alkaline residue field is used as an alkali activator, and waste is treated by waste; finally, seawater is adopted for mixing according to local conditions, so that fresh water resources are greatly saved, and the anti-seepage performance can be improved.

The invention relates to the technical field of building material admixtures, and particularly discloses nano calcium carbonate, an alkaline residue-based solid waste cementing material early strength agent, a preparation method and application. The preparation method of the nano calcium carbonate comprises the following steps: carrying out reaction on alkaline residues and a chlorine-containing solution, and carrying out solid-liquid separation to obtain filtrate; and adding an alcohol solvent into the filtrate, introducing carbon dioxide and nitrogen to carry out carbonization reaction, and crystallizing to obtain the nano calcium carbonate. The growth process of the nano calcium carbonate crystals is controlled by controlling the carbonization reaction conditions and the flow of nitrogen and carbon dioxide, the method has the advantage of being easy to operate, and the prepared nano calcium carbonate is applied to the alkaline residue-based solid waste cementing material early strength agent; the strength, the initial setting time and the final setting time of the solid waste cementing material at each age can be improved, and a new idea is provided for preparation of the alkaline residue-based solid waste cementing material early strength agent.

The application provides a homologous heterogeneous alkali residue-based fluid-state solidified soil and a preparation method and application thereof, and belongs to the technical field of solid waste resource utilization. The alkali residue-based solidified agent is prepared by using the pressure-filtered alkali residue, slag, desulfurization ash, fly ash and cement. The high-water-content paste-shaped original alkali residue, desalted solid salt alkali residue and slag are used as the alkali residue-based matrix soil. The homologous heterogeneous alkali residue has different structures and forms, which can be used as the matrix soil and can be used to prepare the solidified agent, promotes and improves the physicochemical reaction and particle size matching among different components, and thus improves the mechanical properties of the homologous heterogeneous alkali residue-based fluid-state solidified soil. The flowability of the homologous heterogeneous alkali residue-based fluid-state solidified soil can be adjusted by adding a proper amount of water and water reducing agent, the construction demand can be met, and the homologous heterogeneous alkali residue-based fluid-state solidified soil has excellent compacting performance.

This invention discloses a high-pressure salt-erosion resistant solid waste seepage-proof grouting material mixed with seawater and its preparation method. This high-pressure salt-erosion resistant solid waste seepage-proof grouting material can adapt to high-salt and high-pressure environments. Furthermore, the raw materials used are almost "zero-cost": the solid raw materials are all taken from solid waste, realizing the resource utilization of solid waste; the strongly alkaline leachate from the alkali slag field is used as an alkali activator, treating waste with waste; finally, seawater is used for mixing according to local conditions, which not only saves a large amount of freshwater resources but also improves seepage-proof performance.

The application belongs to the technical field of reusing industrial solid wastes, and discloses a waste-reusing low-carbon cementing material and a preparation and use method thereof. The cementing material comprises the following components in mass fraction: 40-97 parts of steel slag, 0-50 parts of mineral slag, 0-10 parts of alkali slag, 0-6 parts of lithium slag, 3-15 parts of a solid reinforcing agent, and 0-0.2 parts of a liquid modifier. The solid reinforcing agent comprises the following components in mass fraction: 0-30 parts of carbide slag, 0-30 parts of sodium carbonate, and 10-80 parts of layer silicon. The liquid modifier comprises the following components in mass fraction: 5-20 parts of acrylamide, 5-20 parts of N-methyl diethanolamine, and 60-90 parts of water. The cementing material has relatively optimal hydration and hardening performance, and improves the resource utilization of steel slag.

The application discloses a kind of based on mix design's containing alkali residue multi-source solid waste cementing material proportioning optimization method, for obtaining the best five kinds of solid waste component proportion according to preset cementing material performance target, wherein alkali residue is used as alkaline excitation component, determines test point using D optimal mix design method, establishes three-order standard polynomial model, sets the constraint condition of each solid waste component, carries out net paste 3 days compressive strength and 28 days compressive strength test to each test point, obtains the first fitting model based on compressive strength response and the second fitting model based on response according to test data, according to preset performance target, according to the first fitting model and the second fitting model, the optimal five kinds of solid waste component proportion are obtained by solving using multi-objective optimization algorithm;The method solves the problems of low efficiency and high cost of traditional trial-and-error method, realizes the scientization and standardization of multi-source solid waste cementing material proportioning design.

The present application relates to solid waste resource utilization technical field, specifically to a kind of three-source solid waste flow state solidified soil and preparation method thereof, by weight fraction, the three-source solid waste flow state solidified soil includes the following components: alkali residue slurry 60~70 parts, tertiary fly ash 10~20 parts, waste mud residue 3~10 parts, cement 10~20 parts and water reducing agent.According to application scene requirement, select control parameter, carry out scheme design, establish prediction model, realize performance prediction, and carry out mix proportion verification, response application scene requirement, form closed loop;And the correlation between microstructure and macro strength is established.The three-source solid waste flow state solidified soil provided by the present application realizes the high-mixing use of solid waste resources, and the solid waste content can reach 80~90%, the fluidity and compressive strength thereof are 160~420mm and 0.47~1.10MPa respectively, which are controllable and adjustable, and can be applied to different application scenarios.

The invention discloses a method for recovering iron, aluminum and sodium in red mud, which comprises the following steps: mixing the red mud and an alkaline solution, and introducing hydrogen into high-temperature and high-pressure equipment to react; carrying out solid-liquid separation on the slurry after reaction, and carrying out magnetic separation after solid-phase grinding to obtain concentrate and tailings; and adding a calcium-containing additive aqueous solution into the tailings for dealkalization reaction to obtain dealkalized residues and dilute alkali liquor. Red mud, an alkaline solution and hydrogen are stirred and reacted in high-temperature and high-pressure reaction equipment, (aluminum) hematite and (aluminum) goethite in the red mud are completely converted into ferroferric oxide, the purpose of extracting aluminum in the red mud is achieved, solid-liquid separation is conducted on slurry after the reaction, ferroferric oxide in a solid phase is separated through magnetic separation, and the iron content in concentrate is high; the method can cooperate with large-scale absorption in the iron and steel industry, and also considers recovery of iron minerals; comprehensive recovery of iron, aluminum and sodium in the red mud is realized, and the method has the advantage of environmental friendliness.

The utility model relates to the technical field of ammonia distillation waste liquid treatment, and discloses separation equipment for ammonia distillation waste liquid treatment, which comprises a bearing plate, a disc type separation structure is arranged on the bearing plate, the disc type separation structure comprises a support frame and a filter disc, the filter disc is fixedly arranged on the support frame, the filter disc comprises a disc body, and the disc body is fixedly arranged on the bearing plate. Fixing rings are fixedly connected to the two sides of the disc body, and mounting blocks are fixedly connected to the fixing rings; the supporting frame comprises a supporting disc, mounting rings are fixedly connected to the two sides of the supporting disc, and the mounting blocks are fixedly connected to the mounting rings in a sleeving mode. According to the utility model, the disc type dehydrator is adopted to replace a traditional plate-and-frame filter press, so that continuous operation can be realized, the dehydration efficiency is greatly improved, the water content of the alkaline residues is effectively reduced, and the water content of the alkaline residues can be controlled to meet the stacking requirement of the alkaline residues.

This invention relates to a process and system for the resource-based treatment of refinery alkali slag. The process includes: (1) firstly, the alkali slag enters the desulfurization unit and is desulfurized using copper oxide as a precipitant; (2) after desulfurization, the alkali slag enters the neutralization unit and is neutralized using CO2 gas as a neutralizing agent; (3) after neutralization, the alkali slag enters the refining unit and is oxidized using ozone and hydrogen peroxide as oxidants; (4) after refining, the alkali slag enters the alkali recovery unit for causticization reaction to recover sodium hydroxide and calcium carbonate; (5) the waste gas generated by the desulfurization unit, neutralization unit, refining unit, and alkali recovery unit enters the tail gas treatment unit, is absorbed by an absorbent, and is discharged into the atmosphere. The saturated absorbent is sent back to the desulfurization unit for recycling treatment together with the alkali slag. The alkali slag resource-based treatment process of this invention has wide applicability, high organic matter degradation rate, high resource utilization degree, and can achieve zero discharge of waste liquid.

The utility model discloses a lye tank for aluminum alloy low-power erosion, belongs to the technical field of aluminum alloy erosion, and solves the problems that an existing aluminum alloy low-power erosion lye tank is poor in heating effect and cleaning is difficult due to the fact that alkali residues adhere to the inner wall of the lye tank. The inner groove plates of the inner groove are fixedly connected to the inner side of the top of the outer groove, the four inner groove plates incline inwards and downwards, every two opposite inner groove plates are in a V shape, the bottom of the inner groove is suspended and not connected with the outer groove, lining plates matched with the inner groove plates are clamped on the inner groove plates, a waste discharge hole is formed in the lower portion of one inner groove plate and connected with a waste discharge pipe, the waste discharge pipe extends out of the outer groove, and the waste discharge pipe is connected with the waste discharge hole. A water injection hole and a water outlet hole are formed in the outer tank, a rectangular box body is arranged at the bottom of the outer tank, and a heating pipe is arranged in the rectangular box body. According to the utility model, the problem that alkaline residues are firmly adhered and are difficult to clean is solved, the concentration of alkaline liquor is effectively ensured, the standardization and accuracy of tests in any season are ensured, and the safety is also remarkably improved.

The present application belongs to the field of building materials and solid waste resource utilization, and relates to a red mud-based cementing material and a preparation method based on efficient drying-component homogenization-activity promotion. A filter aid is added to the red mud for sedimentation, and then pressure filtration is performed to obtain a solid material with a moisture content of 14-16%, which is then dried to a moisture content of less than 4%, and finally ground to obtain the red mud-based cementing material. The filter aid comprises the following raw materials: 10-30 parts of polyaluminum chloride, 5-15 parts of polyaluminum sulfate, 1000-1200 parts of blast furnace slag or fly ash, 700-900 parts of steel slag, 400-600 parts of carbide slag or alkali slag, and 300-400 parts of desulfurization gypsum or phosphogypsum or fluorogypsum. The present application not only improves the dewatering efficiency of the red mud, but also simplifies the preparation process of the red mud-based cementing material by preparing the red mud-based cementing material in one step, and the prepared red mud-based cementing material has the advantages of high mechanical strength, high durability and erosion resistance.

The invention discloses a water-resistant all-solid-waste ardealite road building material and a preparation method thereof. A production raw material formula comprises the following components in parts by mass: 100 parts of ardealite, 3-18 parts of functional solid waste, 0.06-0.15 part of a dispersing agent and 0.12-0.28 part of an adsorbent, the functional solid waste is prepared from the following components in parts by weight: 78 parts of blast furnace mineral powder, 0.1-12 parts of waste concrete powder, 3-8 parts of alkaline residue powder and 5-16 parts of magnesium residue powder; the dispersing agent comprises potassium sodium tartrate; the adsorbent is prepared from polyaluminum sulfate and activated aluminum oxide according to the mass ratio of 1: (0.8-1.3). The method has the advantages that 1) the water resistance of the phosphogypsum road building material is obviously improved; the phosphogypsum road building material has the advantages of simple preparation process, realization of curing and sealing of phosphogypsum pollutants, realization of dual effects of physical sealing and chemical bonding, safe and reliable environmental protection performance, substantial reduction of carbon emission and material cost, and solving of the contradiction between a high phosphogypsum use amount and a low comprehensive cost performance of a large-dosage phosphogypsum road building material.

This invention discloses a multi-source solid waste-based cementitious material and its preparation method, relating to the technical field of cementitious materials for solidified organic soft soil. The raw materials for the cementitious material include: carbide slag, desulfurization ash, yellow phosphorus slag, highly active and stable steel slag, modified red mud, alkaline slag, desulfurized gypsum, slag, and calcium sulfoaluminate; the highly active and stable steel slag is obtained from liquid steel slag after preliminary stabilization treatment and activation; the steel slag activation is achieved by preparing stabilized steel slag, modified ettringite microparticles, aluminum sulfate, polycarboxylate superplasticizer, hexadecyltriethylammonium bromide, and potassium hydroxide; the modified red mud is prepared from red mud, magnesium hydroxide, N-methyldiethanolamine, desulfurization ash, calcium oxide, and ferric chloride solution; the modified ettringite microparticles are modified with polyvinyl alcohol and N-β-aminoethyl-γ-aminopropyltrimethoxysilane. The multi-source solid waste-based cementitious material of this invention effectively improves the compressive strength and water stability coefficient of solidified organic soft soil.