446 results about "Clinker (waste)" patented technology

The invention relates to a high-strength stable solid waste-based composite cementing material and a preparation method and application thereof in the field of building materials. The high-strength stable solid waste-based composite cementing material is prepared from the following raw materials in parts by weight: 70-85 parts of composite solid waste micro powder; 10 to 20 parts of Portland cement clinker; 3-8 parts of a composite activator; 0.5 to 2 parts of a nano-scale function regulator; wherein the composite solid waste micro powder is prepared by mixing and grinding the following raw materials in parts by weight: 40-60 parts of blast furnace slag powder; 20 to 30 parts of fly ash; 10-20 parts of chemically modified electrolytic manganese residue powder; and 5-15 parts of steel slag powder. According to the preparation method, sodium metasilicate is adopted to assist medium-temperature calcination to chemically modify the electrolytic manganese residues, so that not only is the gelation activity of the electrolytic manganese residues effectively excited, but also free-state manganese, cadmium and other heavy metal ions in the electrolytic manganese residues are fixed in situ in newly formed zeolite-like silicate mineral lattices through thermochemical reconstruction; and a brand new technical path is opened up for safe and high-value utilization of the typical hazardous waste, namely the electrolytic manganese residues.

The invention discloses a high-content steel slag-based functionalized nano-composite cementing material and a preparation method thereof, and belongs to the technical field of solid waste resource comprehensive utilization. The nano composite cementing material is prepared from the following raw materials in parts by mass: 50 to 65 parts of steel slag, 10 to 20 parts of fly ash, 10 to 25 parts of carbide slag, 8 to 15 parts of desulfurized gypsum, 0.3 to 1.0 part of nano silicon dioxide and 0.003 to 0.03 part of silane coupling agent. On the basis of a solid waste synergism theory and an internal alkali excitation effect, quaternary solid wastes such as steel slag and fly ash are optimized and compounded by adopting methods of mechanical-thermal activation, addition of modified nano silicon dioxide, synergistic gelling between solid wastes and the like; the paint is prepared through gradient grinding and a medium-temperature wet curing process. The preparation method is simple, high-temperature calcination is not needed, cement clinker and exogenous excitant do not need to be added, the obtained cementing material can replace part of cement to be applied to the fields of road bases, mine filling, low-carbon building material products and the like, resource utilization and high-value utilization of regional bulk industrial solid waste can be achieved, and carbon emission and production cost are effectively reduced.

The invention discloses a high belite iron aluminate cement clinker, which is prepared from the following raw materials in parts by weight: 39 to 73 parts of carbide slag, 8 to 37 parts of low-grade bauxite, 10 to 16 parts of ardealite, 1 to 31 parts of fly ash and 3 to 9 parts of steel slag. According to the cement clinker, the resource utilization rate of industrial solid waste in cement preparation can be remarkably increased, and dependence on natural raw materials and high-grade raw materials is reduced; impurities in various solid wastes can be used as in-situ mineralizing agents and activating agents, and on the basis of realizing high-added-value resource utilization of various industrial solid wastes and low-grade bauxite, efficient synthesis of target minerals at a relatively low temperature is promoted; and gradient temperature control calcination and gradient cooling processes are further combined, so that sufficient crystallization and development of a target mineral phase can be effectively promoted, a clinker microstructure is optimized, excellent early strength and continuously increased later strength of the cement are ensured, and the common problems of strength shrinkage and the like of the traditional solid waste-based cement can be effectively avoided.

The invention provides equipment for extracting lithium from leaching residues and a two-stage roasting water leaching lithium extraction process. The solid waste extraction device comprises a base, an extraction tank, a top plate, an auxiliary pipe and a discharging mechanism. The bottom of the extraction tank is mounted at the top of the base through bolts, the top plate is mounted at the top of the extraction tank through bolts, and the auxiliary pipe is fixedly connected into the top plate; according to the scheme, secondary utilization is carried out on primary leaching residues generated in the traditional lithium leaching and extracting process, secondary leaching is carried out on lithium elements in the primary leaching residues to extract the lithium elements, and therefore secondary utilization is achieved, it can be guaranteed that solid waste is fully utilized, and green and environment-friendly development is facilitated; and secondly, in the blanking process of the primary leaching residue roasting clinker, the rotating pipe in charge of blanking adopts self-rotation design, so that the primary leaching residue roasting clinker can be prevented from being adhered to the inner wall of the pipe through self rotation of the rotating pipe while the blanking can be quickly realized, and the blanking is ensured to be smoother.

The invention relates to a method for improving early-stage performance of an all-solid-waste cementing material, and aims to improve the early-stage performance of the cementing material. At present, the early strength (1d strength) of an all-solid waste cementing material is generally low, but the characteristic is closely related to construction efficiency and is a key limit for large-scale application of the all-solid waste cementing material. Sintering is not included in the working procedures, and the product does not contain cement clinker. The method comprises the following steps: selecting industrial solid wastes such as steel slag, blast furnace water slag, iron alloy slag, silicomanganese slag, industrial byproduct gypsum, sintering fly ash, fly ash, calcined coal gangue and the like as raw materials; the industrial solid waste is subjected to independent or mixed grinding treatment; by optimizing the raw material ratio and introducing key component minerals, the specific surface area of the cementing material is increased, and active sites of the key minerals are dissociated and exposed. The mass of the introduced key components for optimizing the raw material ratio accounts for less than or equal to 15% of the total mass of the cementing material, the mass fraction of the key and active minerals is increased by less than or equal to 10%, and the early strength of the all-solid waste cementing material is increased by 30%.

The invention belongs to the technical field of masonry cement, and particularly discloses all-solid-waste low-carbon-emission masonry cement and a preparation method thereof. Comprising the following steps: 1, finely grinding iron tailings, carbide slag, fly ash and silica fume, and proportioning according to a design to obtain a cement raw material; 2, agglomerating or pelletizing the cement raw material, and calcining according to a designed temperature to obtain a cement clinker; and 3, mixing the cement clinker with a certain proportion of gypsum, and grinding to the target fineness to obtain the masonry cement. The masonry cement is prepared from all solid wastes, meanwhile, a calcium source is mainly provided by the carbide slag with low carbon emission, compared with cement fired by calcium carbonate calcium sources, the carbon emission is greatly reduced, the goal of high-valued and green utilization of various solid wastes including iron tailings is achieved, and the method is suitable for industrial production. The compressive strength, the sulfur trioxide content and the screen residue of the prepared masonry cement meet the national standard requirements of masonry cement. In addition, the masonry cement is prepared from all solid waste raw materials, so that the preparation cost of the masonry cement is reduced.

The invention provides solid waste-based delayed coagulation micro-expansive cement and a preparation method thereof, and belongs to the technical field of building materials. The solid waste-based delayed coagulation micro-expansive cement is prepared from the following raw materials in percentage by mass: 40%-50% of Portland cement clinker, 0.04%-0.06% of a delayed coagulation type grinding aid, 8%-12% of high-calcium steel slag, 10%-16% of slag, 8%-16% of fly ash, 8%-12% of modified phosphogypsum and 8%-12% of calcium-containing powder, wherein a preparation method of the modified phosphogypsum comprises the following steps: uniformly mixing phosphogypsum with phosphorus tailings subjected to high-temperature calcination, and storing for 10-30 days to obtain a mixture; and mixing the mixture with high-calcium steel slag, grinding, and drying to obtain the modified phosphogypsum. The solid waste-based delayed coagulation micro-expansive cement has the advantages of stable delayed coagulation effect, shrinkage compensation effect, continuous increase of later strength and the like; wherein the initial setting time of the solid waste-based delayed coagulation micro-expansive cement is 350 to 380 minutes, and the final setting time of the solid waste-based delayed coagulation micro-expansive cement is 420 to 460 minutes; 28-day compressive strength is greater than or equal to 45 MPa; the 28-day dry shrinkage rate is less than or equal to 0.09%; and the 28-day linear expansion rate is less than or equal to 0.5%.

The invention discloses a method for preparing a low-clinker composite mortar material from granite weathered construction engineering residue soil and mortar. The method comprises the following steps: settling and screening engineering residue soil, and respectively carrying out biomimetic mineralization modification, particle size allocation and proportioning on powdery clayey soil and coarse particles to form mixed mortar; according to the mixed mortar, granite weathering type constructional engineering muck solid waste can be fully utilized, the recycling rate reaches 96%, the performance of the mortar is improved by introducing a biomimetic mineralization modification technology, conditions are mild, no harmful by-products exist, and the mechanical performance of the composite mortar is excellent. Through a biomimetic mineralization modification technology, after the prepared mortar is cured for 28 days, the highest compressive strength can reach 65.45 MPa, and the compressive strength is superior to that of traditional OPC mortar, fly ash composite mortar and untreated muck mortar.

The invention relates to the technical field of solid waste treatment, and discloses a lithium slag treatment method which comprises the following steps: (1) mixing lithium slag and an alkaline reactant, and grinding to obtain a mixed raw material; (2) sintering the mixed raw material to obtain sintered clinker; and (3) dipping the sintered clinker in an alkaline solution, and carrying out solid-liquid separation. According to the method, toxic elements in the lithium slag can be effectively removed, environmental risks caused by long-term stockpiling of the lithium slag are avoided, potassium and sodium elements in the lithium slag can be effectively removed, adverse effects of the lithium slag on soil and building materials in building and soil application are avoided, and the utilization rate of the lithium slag is increased.

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 belongs to the technical field of negative carbon building materials, and particularly relates to a multi-element solid waste negative carbon cement-based material and a preparation method thereof. The material is prepared from the following components in parts by weight: 10 to 320 parts of carbonized carbide slag, 0 to 240 parts of uncarbonized carbide slag, 25 to 640 parts of calcined coal gangue, 25 to 800 parts of Portland cement, 6 to 320 parts of silica fume and other pozzolanic mineral admixtures and 30 to 800 parts of mixing water. The preparation method comprises the following steps: carbonizing the carbide slag until the content of calcium carbonate is more than or equal to 90%, and calcining and activating the coal gangue at 700-800 DEG C; all the powder raw materials are subjected to dry mixing, water is added for segmented stirring, and standard curing is performed after pouring forming. The carbonized carbide slag is used for replacing limestone to achieve carbon sequestration, the calcined coal gangue is used for replacing calcined clay, natural resources are prevented from being exploited, the cement clinker replacement rate of 70% is achieved through the synergistic effect of multi-element solid waste in a low clinker system, the material has excellent mechanical and durability, and carbon emission and resource consumption are remarkably reduced.

The application discloses a method for preparing low-carbon clinker by electrolytic manganese residue and phosphogypsum, and the method comprises the following steps: obtaining phosphogypsum, electrolytic manganese residue and carbonaceous raw materials, drying and crushing, and then mixing and grinding according to the modified C:S, KH value and total CaO:SiO2 mass ratio; the obtained mixture is added with water to form material balls, and then the material balls are dried; the dried material balls are calcined in an oxygen-deficient or oxygen-free environment, and then the low-carbon clinker is obtained after cooling; and the reduction components in the electrolytic manganese residue are used for decomposing the phosphogypsum, so that the industrial solid wastes, i.e., the electrolytic manganese residue and the phosphogypsum, are effectively and cooperatively utilized, and energy is saved; except for the carbonaceous raw materials, the total utilization rate of the electrolytic manganese residue and the phosphogypsum in the batching reaches 100%, the industrial solid wastes, i.e., the electrolytic manganese residue and the phosphogypsum, are effectively and cooperatively utilized, the amount of the carbonaceous raw materials required for decomposing the phosphogypsum is reduced, the cost and carbon emission are reduced, and the low-carbon clinker is synchronously prepared.

The invention discloses a preparation method of low-cost solid-waste-based sulphoaluminate cement, and relates to the technical field of cement preparation.The preparation method comprises the steps of solid waste pretreatment, ingredient design, raw material preparation, low-temperature calcination, clinker quenching and cement powdering.By means of the scheme design, high-aluminum / sulfur-rich solid waste such as red mud, desulfurized gypsum and fly ash is used for replacing 70% or above of natural raw materials, and the low-cost solid-waste-based sulphoaluminate cement is obtained; for example, expensive alumina, natural gypsum and the like, the cost of the raw materials can be directly reduced by more than 40%. Wherein the red mud is used as the waste residue of the aluminum oxide industry, the original treatment cost is very high, and the red mud is converted into an effective aluminum source nowadays, so that negative-cost raw material utilization is realized, and the waste residue treatment cost is also saved; the desulfurized gypsum is used as a power plant waste material to completely replace natural gypsum, so that the sulfur source cost is reduced by 60%. Through comprehensive calculation, the production cost of the clinker is reduced by 30-35% compared with that of the traditional sulphoaluminate cement.

The present invention discloses a waste heat recovery device for cooling cement clinker, which relates to the field of high-efficiency energy-saving industrial technology. Specifically, it includes a mounting platform and a grate cooler body arranged thereon, and a grate plate is arranged in the grate cooler body. The right end of the grate cooler body is provided with a waste heat recovery box into which materials can be transported through the grate plate. The interior of the waste heat recovery box is provided with a material barrel that can shake. The waste heat recovery device for cooling cement clinker realizes efficient heat transfer by constructing a waste heat recovery structure composed of a grate cooler body, a waste heat recovery box, a material barrel, a material spiral plate and a heat collection spiral groove plate. The grate cooler body cooperates with the grate plate to transport the cement clinker to the waste heat recovery box. The crushing component and the connecting hose guide the cement clinker into the material barrel and fall on the material spiral plate. The vibration motor and the first spring cause the material barrel to vibrate, allowing the cement clinker to move downward along the material spiral plate.

The invention relates to the field of building materials, and provides novel flow-state solidified soil which comprises the following raw materials in parts by weight: 75-95 parts of waste engineering residue soil and 5-25 parts of a micro-nano soil solidifying agent, wherein the micro-nano soil stabilizer is powder and is prepared from the following raw materials in parts by weight: 5 to 10 parts of Portland cement, 40 to 50 parts of mineral powder, 60 to 90 parts of biological-solid waste based composite clinker and 2 to 3 parts of modified polycarboxylic acid powder water reducing agent. The invention also provides a preparation method of the fluid solidified soil. According to the flow-state solidified soil, the waste engineering residue soil and the micro-nano soil solidifying agent serve as main raw materials, and the finally obtained material has the advantages of being large in fluidity, small in shrinkage rate and not prone to cracking.

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

A full solid-waste micro-expansive concrete and its preparation method are provided, and relate to the field of concrete material technologies. The full solid-waste micro-expansive concrete includes the following components in parts by weight: 920-1060 parts of a coarse aggregate, 460-582 parts of a fine aggregate, 11-19 parts of an expansive agent, 389-512 parts of a modified solid-waste-based cementitious material, and 231-268 parts of water. The coarse aggregate is coal gangue. The fine aggregate is waste ceramic. The modified solid-waste-based cementitious material includes a solid-waste-based clinker, modified polyvinyl alcohol, and a modified anion exchange resin. The solid-waste-based clinker is prepared from the coal gangue, carbide slag, and desulfurization gypsum. The expansive agent is obtained by calcining the carbide slag. The concrete prepared can ensure the initial strength of the concrete, and guarantee continuous micro-expansion in the later stage, compensating for shrinkage and thereby increasing the overall strength of the concrete.

The invention relates to the technical field of mine filling materials, and provides a low-shrinkage steel slag powder mine filling cementing material and a preparation method and application thereof.The cementing material is prepared from, by weight, 30-40 parts of steel slag powder, 50-60 parts of mineral powder, 8-15 parts of desulfurized gypsum and 0-5 parts of excitant, the excitant is superfine cement clinker, and the specific surface area is larger than or equal to 600 m < 2 > / kg; through a cascade reaction path of early excitation, expansion compensation and continuous enhancement among the components such as the steel slag powder, the mineral powder and the desulfurized gypsum, the filling cementing material which is high in solid waste mixing amount, low in shrinkage and appropriate in strength and has environmental protection benefits and engineering applicability is realized, pollution and carbon are reduced, cost is reduced and benefits are increased for tailing treatment, and the filling cementing material is suitable for being used as a filling cementing material. And the comprehensive utilization way of the tailings and the metallurgical solid waste is further expanded.

The invention relates to the technical field of cement clinker calcination, and provides a solar condensation cement clinker direct calcination waste heat two-way grading utilization system which comprises a preheating module, a heat exchange module, a heat exchange module, a heat exchange module and a heat exchange module which are arranged in the material flow direction, the preheating module comprises a first preheating unit and a second preheating unit; the clinker reactor is arranged at the downstream of the preheating module and is used for calcining raw materials; a decomposed gas outlet of the clinker reactor is connected to the first preheating unit; the cooling machine is arranged at the downstream of the clinker reactor and is used for cooling the clinker; a waste gas outlet of the cooler is connected to the second preheating unit, and an air locking valve is arranged between the reactor and the cooler for tight isolation to prevent waste gas of the cooler from entering the reactor. Through the arrangement, heat in the decomposed gas and heat in the clinker cooling waste gas can be independently utilized, so that the purity of CO2 in the decomposed gas is guaranteed while waste heat is fully recycled and utilized, and the follow-up capture difficulty and capture cost of CO2 are reduced.

The application discloses a high-value resource utilization system and method of waste concrete, and the system comprises a preheating subsystem, a calcining subsystem, a cooling subsystem, a separating subsystem, a crushing subsystem, a dust collecting subsystem and a conveying subsystem. Waste concrete which is coarsely separated and pre-homogenized is mixed into cement raw materials to produce silicate cement clinker, and the test block after coarse crushing, screening, fine crushing and screening is directly stripped, and the separated powder can be used as a mixing material; the test block after stripping is preheated and calcined in a rotary kiln, the obtained material is cooled and stripped, and then sent into a V-type powder separator to separate coarse aggregates, and the fine aggregates and recycled waste concrete micro powder are separated through the powder separator and a dust collector. The application realizes the synergistic effect of pollution reduction and carbon reduction by combining with a cement production line, separates fine aggregates, coarse aggregates and hardened cement paste in the waste concrete, and realizes the high-value resource utilization of the waste in multiple ways according to the characteristics of each component.

The invention relates to the technical field of cement admixtures, in particular to a preparation process of an environment-friendly cement raw material grinding-aid grinding agent. According to the process, electrolytic manganese residues and industrial waste alkali liquor are used as raw materials, and the core is that multi-step synergistic chemical modification is performed: firstly, the electrolytic manganese residues are subjected to low-temperature plasma activation pretreatment to increase surface active sites; secondly, carrying out graft copolymerization on lignin in the industrial waste alkali liquor by utilizing an RAFT (Reversible Addition-Fragmentation Chain Transfer) polymerization technology, and introducing carboxyl and amide groups to synthesize a zwitterionic polymer; then, mixing the modified electrolytic manganese residues with modified alkali liquor, and inducing to generate a nano precursor with a core-shell structure through a supramolecular self-assembly and bionic silicification principle; and finally, carrying out spray drying to obtain a final product. According to the mineralizer disclosed by the invention, the grindability and the burnability of cement raw materials can be remarkably improved, the clinker burning coal consumption can be reduced, more importantly, marine cement can be endowed with excellent chloride ion penetration resistance, and meanwhile, high-added-value resource utilization of solid wastes is realized.

The invention discloses an energy-saving grinding method and system for raw material pre-drying synergistic acting, after clinker discharged from a kiln is conveyed to a belt to be located at the bottom layer, a high-moisture raw material is conveyed to fall on the clinker, and the high-moisture raw material is pre-dried by using waste heat of the clinker; the negative pressure circulation absorption system is arranged above the belt, rising hot steam is absorbed through the negative pressure circulation absorption system, a moisture drying system is naturally formed, moisture of raw materials can be reduced without increasing power consumption, and power consumption in the cement production link can be reduced. A closed elbow chute is arranged at the feeding end of the grinding machine, so that the blanking point of materials falling into the grinding machine is shortened, the working efficiency of the grinding machine is improved, and the power consumption of the grinding machine is further reduced; the gong sieve type discharging plate is arranged above the bin partition plate of the grinding machine so as to reduce the accumulation degree of raw materials in the center of the bin partition plate, the uniformity of the raw materials passing through the second bin is improved, the material dispersion degree and the work efficiency of the second bin are improved, and the power consumption of the grinding machine is further reduced.

The invention relates to a method for preparing sodium aluminate and co-producing flame-retardant grade aluminum hydroxide from secondary aluminum ash, and belongs to the technical field of solid waste resource utilization. The method comprises the following steps: proportioning secondary aluminum ash, bauxite, sodium carbonate and bluestone according to a specific ratio, ball-milling and mixing, and calcining at a high temperature to obtain a sodium aluminate clinker; stirring and leaching the clinker and the leaching solution under specific conditions to obtain a sodium aluminate crude solution and red mud slag; adding an impurity removal agent into the sodium aluminate crude liquid in stages, carrying out normal-pressure and high-temperature stirring reaction, and carrying out ultrasonic-assisted treatment to obtain sodium aluminate fine liquid; adding a seed crystal into the sodium aluminate fine liquid, cooling step by step under a specific stirring condition for decomposition, and after decomposition, carrying out ultrasonic washing, wet grinding, drying and grading treatment on an aluminum hydroxide filter cake to obtain flame-retardant grade aluminum hydroxide; and concentrating the sodium aluminate fine liquid, desalting, cooling, drying and crushing to obtain sodium aluminate solid powder. According to the invention, high-valued utilization of the secondary aluminum ash is realized, the obtained flame-retardant grade aluminum hydroxide has high whiteness, controllable granularity and high purity of sodium aluminate, and is suitable for industrial production.

The invention discloses a method for leaching valuable elements in silicate rare earth ore, and belongs to the technical field of rare earth metallurgy. According to the method, the valuable elements in the rare earth concentrate are efficiently leached by adopting the processes of low-temperature sulfating intensified roasting, clinker hydrometallurgy, leached ore pulp flocculation and filter cake washing. The strengthened low-temperature sulfating roasting process avoids the problems of high energy consumption, serious equipment corrosion, low rare earth leaching rate and complex waste gas treatment (SO2 escape) of a traditional process, meanwhile, silicate rare earth ore decomposition is achieved, the effect of a back-end leaching process is remarkably improved, compared with an acid pickling process, the hydrometallurgy process reduces the acid consumption and the wastewater treatment difficulty, and the production cost is reduced. The leaching ore pulp flocculating settling process is beneficial for improving the industrial production efficiency, the filter cake washing process is beneficial for further improving the leaching rate of valuable elements, the silicate rare earth ore concentrate resources are utilized to the maximum extent on the premise of being environmentally friendly, and a technical path is provided for industrial utilization of silicate type rare earth ore.

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

The invention discloses a 3D printing residue soil baking-free brick and a preparation method thereof. The 3D printing residue soil baking-free brick is prepared from engineering residue soil, cement clinker, fly ash, slag, unsaturated fatty acid salt, silane coupling agent surface modified calcium carbonate whiskers, an initiator, a polymerization accelerator, strong alkali and a water reducing agent. The solid wastes such as the engineering residue soil are used as main components, and the mechanical property and the durability of the baking-free brick are remarkably improved by utilizing in-situ polymerization and whisker cooperative regulation and control. The preparation method is simple, high in printing adaptability, low in cost and suitable for industrial application.

The invention provides a clinker-free cement activator, and relates to the field of cement activators. According to the present invention, the high-performance fly ash geopolymer cement with characteristics of low cost, high strength and baking-free property and the product thereof can be prepared, the fly ash geopolymer cement of different grades can be produced according to the quality and the use amount of the fly ash, and the high-performance cement product can be prepared by using the cement through a certain means and process, the clinker-free calcium-containing substance / low-calcium fly ash composite cement can completely replace corresponding cement products of 32.5 R or 42.5 R Portland cement, has considerable economic and social benefits, can fully stimulate the activity of calcium-containing substance / low-calcium fly ash, effectively improves the early strength of the clinker-free calcium-containing substance / low-calcium fly ash composite cement, shortens the setting time, reduces the energy consumption, improves the quality and yield of the cement, and reduces the cost of the cement. In addition, the mixing amount of the fly ash in the clinker-free composite cement can be increased, and as the fly ash is a waste, the multipurpose fly ash can reduce pollutant emission, protect the environment, turn waste into wealth and realize comprehensive utilization of resources.

The invention relates to the technical field of building materials, in particular to flow-state solidified soil as well as a preparation method and application thereof. The flow-state solidified soil comprises the following components in percentage by mass: 50%-60% of muck, 35%-40% of water and 5%-13% of a curing agent, wherein the curing agent is prepared from the following components in parts by weight: 5 to 25 parts of cement clinker, 25 to 50 parts of superfine slag powder, 10 to 25 parts of fly ash, 10 to 20 parts of waste gypsum, 10 to 20 parts of mountain flour slag, 1 to 3 parts of anti-dispersing agent and 1 to 5 parts of water reducing agent. According to the invention, the defect that the plugging effect is poor when cement paste is used as a drilling hole exploration plugging agent at present can be improved.

The application discloses a preparation method of high-content coal gasification slag-based cement, and belongs to the technical field of solid waste resource utilization. High-carbon coal gasification slag, steel slag, carbide slag and clay are used as raw materials, low-carbon coal gasification slag, circulating fluidized bed fly ash and desulfurization gypsum are used as active admixtures, the rate value is designed and the configuration proportion of various raw materials and active admixtures is calculated according to the chemical composition of the finally prepared high-content coal gasification slag-based cement; then the various raw materials and active admixtures are pretreated, the pretreated raw materials are mixed, ball milled and sieved to prepare cement raw materials and further prepare cement clinker; finally, the cement clinker and the active admixtures are mixed, ball milled and sieved to prepare the high-content coal gasification slag-based cement. The high-content coal gasification slag-based cement is prepared by fully utilizing industrial solid wastes, can replace natural raw materials for producing cement, meets the national "double carbon" planning, and is a low-carbon, environment-friendly and green cement preparation method.

The invention provides a process for preparing cement from aluminum electrolysis overhaul residues and waste anti-seepage material lithium extraction residues, and relates to the technical field of solid waste co-treatment and resource utilization, and the process comprises the following steps: mixing pretreatment: crushing and grinding mixed raw materials, adding a calcium-based fluorine fixing agent, and roasting to decompose cyanide and stabilize fluoride; preparing a cement raw material: mixing the mixed residues with other raw materials according to a certain ratio, adjusting the ratio value, and grinding to prepare the cement raw material; calcining the clinker, namely calcining the raw material at high temperature, treating flue gas, and quickly cooling to obtain the cement clinker; according to the invention, a carbonaceous material in the overhaul slag is utilized to provide part of heat, so that the energy consumption is reduced; fluorides in the two wastes react with each other to generate a more stable compound, so that the fluorine curing efficiency is improved, and the environmental risk is thoroughly eliminated; heavy metal is further solidified in a cement kiln high-temperature environment, harmless treatment is achieved, the resource utilization rate is increased, and product performance is reliable.