34 results about "Calcium aluminosilicate" patented technology

The invention discloses a yellow phosphorus tailing-based mine filling material and application thereof. The yellow phosphorus tailing-based mine filling material comprises aggregate and a cementing material, the cementing material comprises the following components in parts by mass: 5-20 parts of red mud, 20-40 parts of yellow phosphorus slag, 10-30 parts of slag, 5-10 parts of fly ash, 5-10 parts of a compound exciting agent, 1-3 parts of an early strength agent and 2-5 parts of a water-retaining agent; wherein the compound exciting agent comprises the following components in parts by mass: 10-20 parts of sodium metasilicate, 30-40 parts of gypsum powder, 20-30 parts of sodium sulfate, 5-10 parts of carbide slag and 5-10 parts of silica fume; according to the invention, the raw materials are compounded and the specific exciting agent is subjected to depolymerization-polycondensation reaction to obtain a cementing material containing Aft (ettringite), C-S-H gel (hydrated calcium silicate gel) and C-A-S-H gel (hydrated calcium aluminosilicate gel), and finally, the mine filling material with high fluidity, low bleeding rate and high strength is obtained while yellow phosphorus tailing solid waste is treated.

The invention discloses a high-ground-temperature-resistant ultrahigh-flow nano-modified polymer grouting material as well as a preparation method and application of the high-ground-temperature-resistant ultrahigh-flow nano-modified polymer grouting material, and belongs to the technical field of geotechnical engineering. According to the present invention, the nanometer modified cementation particles are combined with the calcium hydroxide, the sodium carbonate, the cellulose nanofiber and the tannic acid to regulate and control the hydration process, the fluidity and the mechanical strength, the nanometer modified cementation particles are injected into the deep surrounding rock, the high fluidity can be maintained in the high ground temperature environment for a long time, the grouting diffusion range is effectively expanded, and the accurate regulation and control of the grouting material gelling time can be achieved. Meanwhile, high-mass-fraction fly ash and silica fume are excited to generate calcium aluminosilicate hydration products, and the problems that an existing conventional calcium silicate grouting cementing material is poor in reinforcing and anti-seepage effect in a high-ground-temperature environment, slurry is prone to cracking and the like are solved.

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 an anti-oxidation coating for an anode carbon block and a preparation method of the anti-oxidation coating, and belongs to the technical field of anode anti-oxidation coatings. Comprising an inner-layer coating and an outer-layer coating, the inner coating is prepared from the following components in parts by weight: 45 to 55 parts of aluminum oxide, 3 to 4 parts of silica sol, 4 to 5 parts of aluminum phosphate, 0.5 to 1.0 part of boron nitride nanosheet, 0.5 to 1.0 part of CeO2, 3 to 5 parts of TiB2 graphene and 1.2 to 1.5 parts of polyacrylic acid dispersing agent; the outer-layer coating comprises the following components in parts by weight: 10-15 parts of aluminum oxide, 6-9 parts of silicon carbide whiskers, 8-10 parts of aluminum calcium magnesium silicate glass powder, 1-2 parts of boron nitride nanosheets, 1-2 parts of Y2O3, 0.5-1.0 part of CeO2, 1.5-2.5 parts of aluminum phosphate and 2-3 parts of mullite fibers. The high-temperature stability and environmental protection property of the coating can be remarkably improved, meanwhile, the gradient structure design is introduced, conductivity and permeability resistance are both considered, and the pole changing period is prolonged.

The purpose of the present invention is to provide a calcium aluminosilicate-based compound that, when added to cement or the like, has high compressive strength and is capable of imparting a favorable surface finish. This calcium aluminosilicate-based compound contains, as chemical components, 30-60 mass% of CaO, 10-60 mass% of Al2O3, 1-15 mass% of SiO2, 10-50,000 ppm of P2O5 by mass ratio, and 0.1-1 mass% of MgO.

According to the method for separating iron oxide particles in raw ore pulp and underflow red mud in the aluminum oxide production process through electrophoresis and the electrophoretic separation device, iron oxide moves towards a negative electrode in an electrophoresis tank and is enriched at the negative electrode to form high-iron slurry, the iron oxide is pushed downwards through a scraper blade to enter a high-iron slurry collecting tank and then is discharged for solid-liquid separation, and iron oxide solids are separated out. When the iron oxide is separated, the aluminum oxide, the calcium oxide, the titanium oxide and the like slowly move towards the negative electrode, the aluminosilicate and the aluminate carry negative charges, and the silicon oxide, the calcium aluminate, the calcium aluminosilicate and other particles move towards the positive electrode and are enriched to form low-iron slurry, a flocculating agent is added into a positive electrode area, and the low-iron slurry after the iron oxide is separated is flocculated and settled to enter a low-iron slurry collecting tank to be discharged.

The invention discloses waste brick micro powder based geopolymer concrete and a preparation device and method, and belongs to the technical field of building materials, the waste brick micro powder based geopolymer concrete comprises a crushing device, a grinding device, a conveying device, a stirring device and a forming device; the crushing device is used for crushing waste bricks to form waste brick fragments, the grinding device is used for grinding the waste brick fragments to form waste brick micro powder, and the two ends of the conveying device correspond to the discharging end of the crushing device and the feeding end of the grinding device correspondingly and are used for conveying the waste brick fragments. According to the invention, the waste brick micro powder is used as a mixed material or admixture for replacing cement and reacts with water to generate hydrated calcium silicate gel and calcium hydroxide; the hydrated calcium silicate gel can bond the aggregate to form a compact structure with certain mechanical strength, and the calcium hydroxide can react with amorphous SiO2 and Al2O3 in the waste brick micro powder to generate hydrated calcium silicate, hydrated calcium aluminate or hydrated calcium aluminosilicate; a series of problems caused by nowhere to stack a large amount of waste concrete are effectively solved.

The invention relates to a method for preparing cement clinker from magnesium slag and carbide slag, and belongs to the technical field of cement materials.The cement clinker is prepared from carbide slag, modified magnesium slag, activated converter slag and coal gangue as main raw materials, the modified magnesium slag is an Mg3 (PO4) 2 protective layer formed by ball-milling modification of magnesium slag through a Mg (H2PO4) 2 aqueous solution and a ferulic acid ethanol solution, and the magnesium slag is a magnesium slag protective layer formed by ball-milling modification of activated converter slag and coal gangue. The activated converter slag is obtained by roasting and activating the converter slag and Na2CO3; the four raw materials are mixed according to a certain proportion, a Li2B4O7-CaF2 composite mineralizer is added for low-temperature calcination, a proper amount of SO2 is introduced to induce generation of a new three-phase system of gehlenite-dicalcium silicate-spinel, carbon emission can be effectively reduced, fuel energy consumption can be saved, and the obtained cement clinker has high early strength and can be widely applied to the field of cement materials. The early strength and the later strength stability are well balanced, cracking is not prone to occurring, and the sulfate corrosion resistance is excellent.

The invention discloses a method for comprehensively utilizing vanadium and chromium resources, which comprises the following steps: mixing chromium hydroxide with sodium hydroxide, and introducing oxygen for liquid-phase oxidation to obtain an oxidation solution; adding calcium oxide into the oxidation liquid, stirring and mixing, and performing solid-liquid separation after reaction to obtain calcium vanadate solid and vanadium-free alkali liquid; adding a decalcifying agent into the vanadium-free alkali liquor, and carrying out solid-liquid separation to obtain calcium carbonate and refined sodium chromate alkali liquor; reacting calcium vanadate with roasting slurry containing aluminum, silicon and carbonate to form calcium aluminosilicate precipitate and desiliconized high-vanadium alkali liquor; continuously neutralizing the desiliconized high-vanadium alkali liquor and the carbonization solution to obtain an aluminum-vanadium high-valued product and a neutral solution; the neutral liquid is carbonized, and obtained sodium bicarbonate and carbonized liquid can be returned to a system for recycling. The method for comprehensively utilizing the vanadium and chromium resources has the advantages of being simple in process, environmentally friendly, efficient, easy to control in operation, easy to obtain raw materials, low in production cost and the like.

The present invention discloses a dechlorination and detoxification fly ash-waste glass powder-slag composite alkali-activated gelling material and a preparation method thereof. The alkali-activated gelling material is mainly composed of hydrated calcium aluminosilicate gel and hydrated sodium aluminosilicate gel, and the raw material composition includes: dechlorination and detoxification fly ash, waste glass powder, slag and alkali activator, wherein the alkali activator is prepared from sodium silicate solution and sodium hydroxide solid; the present invention realizes efficient resource utilization and improvement of the performance of alkali-activated gelling materials by scientifically proportioning raw materials. The precursor selected by the present invention is rich in active mineral components such as calcium, silicon, and aluminum, and the alkali activator prepared by adding sodium silicate solution and sodium hydroxide solid provides an ideal alkaline environment for the system, and the chemical components between the components complement and synergize, so that the system can simultaneously generate C-A-S-H gel and N-A-S-H gel. Thereby achieving material properties of high compressive strength, moderate setting time, and reaction heat balance, while having good working performance and long-term durability.

The invention relates to a method for binding sulfates in a body of water comprising sulfates, a calcined mixture prepared by calcining a mixture comprising calcium oxide and calcium alumina and / or calcium aluminate and cooling it to bind sulfates in a body of water, and the use of at least one element comprising CaO and mayenite supergroup and / or of a powder mixture and / or calcined mixture comprising at least one calcium aluminosilicate and / or at least one calcium aluminosilicate and / or calcium silicate for binding sulfates in a body of water.

The present invention relates to a method of binding sulfate in a water body comprising sulfate, to a calcined mixture produced by calcining a mixture comprising calcium oxide and a calcium aluminium oxide and / or a calcium aluminate and cooling for sulfate binding in a water body, and to the use of a powder mixture comprising CaO and at least one element of the mayenite supergroup and / or comprising at least one calcium aluminium aluminosilicate and / or at least one calcium aluminosilicate and / or a calcium silicate and / or the calcined mixture for sulfate binding in a water body.

The invention discloses an inorganic gel-microorganism composite self-repairing agent as well as a preparation method and application thereof. The self-repairing agent is prepared from the following substances in parts by weight: 60 to 70 parts of inorganic mineral, 1 to 2 parts of polyacrylamide, 13.5 to 14.25 parts of monosaccharide, 4.5 to 4.75 parts of microorganism and 10 to 20 parts of barite powder. The inorganic mineral comprises one or more of a calcium source, a silicon source and an aluminum source, and the atom molar ratio of calcium to aluminum to silicon in the calcium source, the silicon source and the aluminum source is (0.5-2): (0-0.5): 1. The preparation method comprises the following steps: preparing the component A and the component B; watering and maintaining; dipping in styrene-acrylic emulsion, and drying; soaking, taking out and drying. The hydrated calcium silicate gel and the hydrated calcium aluminosilicate gel which are formed by induction in the initial stage of repair are hydration products of Portland cement, and the problem of compatibility between the repair products and a matrix can be avoided to a great extent when the hydrated calcium silicate gel and the hydrated calcium aluminosilicate gel are used for filling the cracks with the hydrated calcium silicate gel and the hydrated calcium aluminosilicate gel.

An artificial culture medium for mushroom cultivation, which contains amorphous calcium aluminosilicate that contains CaO in an amount of 30 to 60% by mass, Al2O3 in an amount of 10 to 60% by mass, SiO2 in an amount of 5 to 40% by mass, and P2O5 in an amount of 100 to 5,000 ppm by mass.

The application provides a method for efficiently removing beryllium and thallium in lithium residue, comprising the following steps: S1, providing lithium residue; the lithium residue contains beryllium and thallium, and the lithium residue has calcium aluminosilicate; S2, performing hydrothermal treatment on the lithium residue and an acid solution to obtain a reaction liquid; the acid solution comprises one or more of sulfuric acid solution, hydrochloric acid solution, nitric acid solution and phosphoric acid solution; the concentration of the acid solution is not less than 1 mol / L; the temperature of the hydrothermal treatment is not less than 100 DEG C, and the time of the hydrothermal treatment is not less than 2 h; and S3, performing solid-liquid separation on the reaction liquid to obtain a beryllium and thallium separation liquid and a detoxification residue. The application has excellent removal effect on beryllium and thallium in lithium residue, and can realize low-cost detoxification and reuse of the lithium residue.

The invention discloses an incineration fly ash curing material based on multi-element solid waste and a preparation method of the incineration fly ash curing material, and belongs to the field of solid waste treatment and ecological environment materials. The method comprises the following steps: S1, uniformly mixing incineration fly ash, red mud, soluble sodium salt and water to obtain a mixture; s2, stirring the mixture obtained in the step S1 for 3-10 hours, and drying to obtain a dry material; s3, calcining the dry material obtained in the step S2, and grinding after calcining to obtain powder; and S4, uniformly mixing the powder obtained in the step S3 with red mud, alkaline residues and water glass to obtain the incineration fly ash curing material. The main raw materials of the red mud, the incineration fly ash and the alkaline residues are all solid wastes, so that the co-treatment of treating wastes with wastes is realized, and the social and environmental benefits are remarkable. According to the method, through reasonable proportioning, directional regulation and control and design are carried out on a hydration product, generation of a gel phase of calcined layered double hydroxides and calcium aluminosilicate is induced, and in-situ curing of heavy metal and chloride ions in the incineration fly ash is achieved.

The present invention relates to a method of binding sulfate in a water body comprising sulfate, to a calcined mixture produced by calcining a mixture comprising calcium oxide and a calcium aluminium oxide and / or a calcium aluminate and cooling for sulfate binding in a water body, and to the use of a powder mixture comprising CaO and at least one element of the mayenite supergroup and / or comprising at least one calcium aluminium aluminosilicate and / or at least one calcium aluminosilicate and / or a calcium silicate and / or the calcined mixture for sulfate binding in a water body.

The present invention relates to a multi-element oxide high-temperature resistant aerogel composite material and a preparation method thereof. The method comprises: using water to uniformly disperse an aluminum source and a magnesium source to obtain a dispersion, then adding a structure modifier and a mineralizer to the dispersion and performing a hydrothermal reaction to obtain a composite precursor sol; the aluminum source is aluminum oxide nanowires and / or aluminum oxide nanobelts; the magnesium source is magnesium oxide nanopowder; mullite nanofibers, silicon carbide nanopowder, and an inorganic gelling agent are added to the composite precursor sol and mixed uniformly, and after the system is gelled, it is aged to obtain a wet gel; the inorganic gelling agent is calcium aluminosilicate cement and / or calcium ion-doped zirconium oxide sol; the wet gel is sequentially subjected to solvent replacement and supercritical drying to obtain a multi-element oxide high-temperature resistant aerogel composite material. The present invention improves the temperature resistance of the material, effectively controls the particle size and structure of the material, and can effectively improve the mechanical and thermal properties and high-temperature sintering performance of the aerogel thermal insulation material.

The invention discloses coal gangue-based light high-strength unfired ceramsite and a preparation method thereof, and relates to the technical field of preparation of building materials. The gangue-based light high-strength unfired ceramsite is prepared from the following components in parts by weight: 30 to 40 parts of gangue, 20 to 30 parts of cement, 30 to 50 parts of a composite admixture, 40 parts of water, 0.5 to 2 parts of an air entraining agent, 0.05 to 0.2 part of a foam stabilizer, 0.1 to 0.25 part of a waterproof agent and 0.5 to 2.0 parts of carboxymethyl cellulose. The coal gangue, the steel slag and the high-calcium fly ash selected in the invention have relatively high content of SiO2 and Al2O3, the slag contains a large amount of CaO, the industrial byproduct gypsum promotes generation of ettringite by exciting the slag, a silicon-aluminum compound is depolymerized under the action of alkalinity and sulfate, and is subjected to hydration reaction with alkaline components, so that the content of the silicon-aluminum compound is reduced; and polymerizing to generate gelling hydration products such as hydrated calcium silicate gel, hydrated calcium aluminosilicate gel and the like.

The invention belongs to the field of polluted groundwater remediation, and relates to a method for ensuring long-term stability of a polluted groundwater remediation effect, which is used for maintaining the long-term stability of the polluted groundwater remediation effect, and specifically comprises the following steps: injecting an alkali solution into soil through an injection well, and simultaneously extracting groundwater at an extraction well end, after the concentration of the pollutants in the extracted underground water is reduced to a target value, the injection of the alkaline solution is stopped; and injecting the calcium and / or magnesium solution into the soil through the injection well until the soil is filled with the calcium and / or magnesium solution and the concentration of pollutants in the underground water is lower than a target value, so as to finish the long-term stabilization treatment of the polluted underground water remediation. Alkali liquor and calcium and / or magnesium solution are injected into the soil through the injection well, and calcium aluminosilicate and / or magnesium aluminosilicate gel are / is generated at the junction of the low-permeability area and the high-permeability area of the soil to form an isolation belt, so that pollutants which are not removed in the remediation process of the low-permeability area are prevented from diffusing to the high-permeability area and entering an underground water flow channel; therefore, the long-term stability of the groundwater remediation effect is ensured.

The invention discloses a preparation method of a cementing material system based on calcium carboaluminate and hydrated calcium aluminosilicate, and belongs to the field of building materials. The method comprises the following steps: heating refractory clay to 500 DEG C within 30 minutes, heating to 750 DEG C at a heating rate of 2 DEG C / min, and keeping the temperature for 3 hours, so that a kaolin crystal structure is destroyed, and amorphous metakaolin with interlayer pore channels is formed; grinding the fly ash in a ball mill; mixing the light-burned refractory clay with quick lime, and grinding; limestone with the CaO content higher than 50% is ground till the specific surface area ranges from 600 m < 2 > / kg to 650 m < 2 > / kg; grinding the cement clinker and the desulfurized gypsum until the specific surface area is 350-400m < 2 > / kg; and mixing the superfine fly ash, the light-burned refractory clay, the quick lime, the limestone powder, the cement clinker and the desulfurized gypsum to generate the cementing material system based on the calcium carboaluminate and the hydrated calcium aluminosilicate. By using the cementing material system, the content of the clinker in the cement is greatly reduced, and the use amount of the cement clinker is only 1 / 3 of that of ordinary cement.

The invention relates to the technical field of concrete, and particularly discloses tunnel lining concrete and a preparation method thereof. The tunnel lining concrete is prepared from the following raw materials in parts by mass: 320 to 380 parts of Portland cement, 60 to 100 parts of fly ash, 40 to 80 parts of superfine slag powder, 950 to 1100 parts of coarse aggregate, 750 to 850 parts of fine aggregate, 30 to 55 parts of expanding agent, 0.8 to 1.2 parts of polypropylene short fiber, 4.5 to 6.5 parts of polycarboxylate superplasticizer and 150 to 170 parts of water, the expanding agent is prepared from calcium aluminosilicate clinker, sodium fluoroaluminate and water through double decomposition reaction. The expanding agent is prepared from the calcium aluminosilicate clinker, sodium fluoroaluminate and water through a double decomposition reaction, the main product of the expanding agent is calcium aluminofluorosilicate expanding crystals, meanwhile, generated sodium hydroxide and aluminum hydroxide serve as beneficial by-products, concrete shrinkage can be compensated in a staged mode, the pore structure can be optimized, and the crack resistance, impermeability and durability of concrete can be synergistically improved; the compatibility with all the raw materials is good, and the problem that the tunnel lining concrete is poor in anti-cracking and anti-permeability synergism can be solved.

This invention provides a hydrothermal-synthesized, long-term, anti-degradation, low-density cementing material for ultra-high temperature environments and its preparation method. This cementing material incorporates calcium oxide, silicon oxide, and various calcium aluminates into its formulation. The hydration reaction of these raw materials at high temperatures generates a substance with a certain strength. Simultaneously, under high-temperature conditions, the three types of calcium aluminates in a specific ratio can react with calcium oxide and silicon oxide to form hydrated calcium aluminosilicate (C-A-S-H), which exhibits long-term high-temperature resistance, thus ensuring the long-term high-temperature performance of the cementing material. Through this method, a cementing material that does not experience strength degradation under long-term high-temperature conditions (90 days of curing at 240℃) is obtained, effectively solving the problem of strength degradation at high temperatures in existing cement slurries used in deep wells.

The invention discloses a double-alkali-activated fly ash roadbed cementing material and a preparation method thereof, belongs to the technical field of industrial solid waste resource utilization and road engineering, and solves the technical problem that raw materials such as an exciting agent, a reinforcing agent or cement lime are required to be added in the preparation process of an existing roadbed material. The double-alkali-activated fly ash subgrade cementing material is prepared from, by mass, 30-50 parts of red mud, 25-35 parts of fly ash and 25-35 parts of carbide slag, alkali metal Na2O in the red mud and alkaline earth metal CaO in the carbide slag are subjected to double-alkali compounding to be subjected to an alkali-activated reaction with the fly ash, hydrated calcium aluminosilicate and hydrated sodium aluminosilicate gel substances are generated, the synergistic gelling effect is achieved, and the subgrade subgrade cementing material is prepared. The alkali-activated reaction degree of the fly ash is remarkably improved, and the mechanical property and durability of the roadbed cementing material are greatly improved. According to the invention, the solid waste is completely used as the raw material, no extra exciting agent, reinforcing agent or cement lime or other raw materials need to be added, the preparation cost of the roadbed cementing material is reduced, and the resource utilization of the solid waste is realized.

The invention provides an internal curing agent, a high-strength low-shrinkage alkali-activated composite material prepared from the internal curing agent and a method, and belongs to the technical field of shrinkage control of alkali-activated cementing materials. According to the invention, acrylamide and acrylic copolymer (NIPAm-SA) is adopted as a template skeleton, a calcium aluminosilicate hydrate crystal nucleus (C-A-S-H) is modified through a coordinate bond self-assembly reaction, the three-dimensional network calcium aluminosilicate hydrate (C-A-S-H-coated NIPAm-SA) is synthesized, and the C-A-S-H-coated NIPAm-SA can be used as an internal curing agent. The C-A-S-H-coated NIPAm is mixed with an alkali-activated cementing material, and the prepared high-strength low-shrinkage alkali-activated composite material has the advantages of high internal curing efficiency, remarkable self-shrinkage inhibition effect, high early strength and the like. According to the invention, the synergistic effect of hydrated calcium aluminosilicate for internal curing and nucleation sites is realized, and more importantly, the hydrated calcium aluminosilicate can be suitable for a high-alkalinity environment of an alkali-activated cementing material and can be well combined with a matrix, so that the problem of large self-constriction of the alkali-activated cementing material is relieved.

Described herein are processes for synthesizing hydraulic-carbonating binder systems through mechanochemical process, including providing a blend of material stream one of aluminosilicate or calcium aluminosilicate mineral material and material stream two of alkaline-rich mineral material; and simultaneously fractioning the blended minerals while contacting the blended minerals with a CO2-containing in the mechanochemical reactor. This binder system is useful for cementation functions in concrete. The precipitated carbonation products are mainly calcium carbonates (CaCO3), magnesium carbonates (MgCO3), and amorphous alumina-silica gel. The developed binder system is activated through hydration and / or concurrent hydration-carbonation reactions in concrete and it can be utilized in the form of slurry or dried powder for a wide range of precast and cast-in-place or ready-mix concrete applications. The binder system reacts with cement in concrete to form carbonate / calcium-silicate-hydrate (C—S—H) composite phases that result in enhanced mechanical properties.

The invention discloses a treatment method of aquaculture wastewater, which comprises the following steps: under an alkaline condition, introducing aluminum and magnesium elements into lime to form a calcium hydroxide composite system, and pre-aggregating dispersed calcium hydroxide composite system particles into a porous floc by using cationic polyacrylamide in the calcium hydroxide composite system to form improved lime; the method comprises the following steps: performing primary solid-liquid separation and water quality regulation on breeding wastewater, adding improved lime, and uniformly stirring; according to the breeding wastewater treatment method provided by the invention, the improved lime is used for replacing common lime, and the improved lime has a lime composite system with stronger adsorption and flocculation capabilities, has a larger specific surface area, increases the density of active sites, is beneficial to adsorbing positively charged suspended matters by utilizing static electricity, improves the flocculation capability, and improves the adsorption efficiency. PAM is beneficial to adsorption and flocculation of negatively charged suspended solids, calcium aluminosilicate double salt has strong ion exchange capacity, and silicate generated after improved lime is dissolved in water can coat floc, so that the adsorption capacity and flocculation strength of the composite system are improved.

This invention discloses a self-compacting expansive concrete and its preparation method, comprising the following raw materials in parts by weight: cement: 420-480 parts; fly ash: 50-70 parts; fine aggregate: 720-800 parts; coarse aggregate: 950-1050 parts; water: 120-200 parts; water-reducing agent: 8-16 parts; expansive agent: 32-40 parts; wherein the expansive agent comprises two or more of calcium aluminosilicate, calcium sulfoaluminate, and magnesium oxide. This application has the effect of improving the fluidity of concrete.

The invention provides a method for efficiently removing beryllium and thallium in lithium slag. The method comprises the steps that S1, the lithium slag is provided; the lithium slag contains a beryllium element and a thallium element, and the lithium slag contains calcium aluminosilicate; s2, the lithium slag and an acid solution are jointly subjected to hydrothermal treatment, and a reaction solution is obtained; the acid solution comprises one or more of a sulfuric acid solution, a hydrochloric acid solution, a nitric acid solution and a phosphoric acid solution; the concentration of the acid solution is not less than 1mol / L; the temperature of the hydro-thermal treatment is not lower than 100 DEG C, and the duration of the hydro-thermal treatment is not less than 2 hours; and S3, carrying out solid-liquid separation on the reaction liquid to obtain beryllium thallium separation liquid and detoxified slag. The method has an excellent removal effect on beryllium and thallium elements in the lithium slag, and low-cost detoxification and reutilization of the lithium slag can be realized.

The present invention relates to a method for binding sulfate in a body of water comprising sulfate, an annealed mixture for sulfate binding in a body of water produced by annealing a mixture comprising calcium oxide and a calcium aluminum oxide and / or a calcium aluminate and cooling, as well as the use of a powder mixture comprising CaO and at least one element of the mayenite group and / or comprising at least one calcium aluminum aluminosilicate and / or at least one calcium aluminosilicate and / or a calcium silicate and / or the annealed mixture for sulfate binding in a body of water.