311 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 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 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.

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 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 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 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 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.

The invention relates to a static sintering method and system for preparing aluminum hydroxide by extracting an aluminum element from fly ash, and the static sintering method comprises the following steps: firstly, taking a raw material which is crushed to a process control fineness as a pre-powder material, carrying out raw material preparation and blank forming on the pre-powder material to obtain a blank, sintering the blank to obtain a clinker, and sintering the clinker to obtain the aluminum hydroxide. The clinker is dissolved out to obtain slurry, and then the slurry is subjected to slurry desilicication, carbon component reaction, hydrogen-aluminum separation and drying to prepare high-whiteness and high-purity aluminum hydroxide; wherein the raw materials comprise fly ash; the blanks are sintered into polygon prism-shaped blanks, the polygon prism-shaped blanks are stacked on a high-temperature-resistant kiln car in an industrial tunnel kiln, the blanks are roasted in the industrial tunnel kiln, and the roasting temperature ranges from 800 DEG C to 1100 DEG C. According to the invention, solid wastes such as fly ash, coal gangue, carbide slag and the like, pulverized coal and sodium carbonate are crushed into materials with the same fineness, high-whiteness and high-purity aluminum hydroxide can be obtained through an alkaline static sintering process, the recovery rate of aluminum in the solid wastes is about 90%, and harmless, resource and synergistic utilization of the solid wastes such as fly ash and the like is realized.

This invention provides a hot-quenched steel slag-based multi-solid waste synergistic composite cementitious material and its preparation method, comprising the following steps: preparing ultrafine powders: grinding and sieving the raw materials of the cementitious material to obtain various ultrafine powders; mixing ultrafine coal gangue powder, ultrafine calcium carbide slag powder, and a portion of ultrafine desulfurized gypsum powder, adding water, and mixing evenly to obtain a preliminary wet mixture; pressing; preparing clinker powder; mixing ultrafine hot-quenched steel slag powder, ultrafine slag powder, the remaining ultrafine desulfurized gypsum powder, and clinker powder, mixing evenly, and sealing for storage to obtain the cementitious material. Through the synergistic effect of hot-quenched steel slag-based multi-solid wastes, the cementitious material is prepared without the use of chemical alkaline activators, achieving effective resource utilization of steel slag, reducing waste, and mitigating carbon emissions and land occupation caused by long-term steel slag accumulation, resulting in significant environmental and social benefits.

The invention relates to the field of solid waste resource recovery, in particular to a method for recovering iron, calcium and rare elements in red mud through cooperation of magnetic separation and oxalic acid. The method comprises the following steps: mixing red mud with a reducing agent, then carrying out reduction roasting at 600-900 DEG C, grinding the roasted clinker, then carrying out water leaching, carrying out solid-liquid separation, and washing; magnetic separation is conducted on the water leaching residues, and iron ore concentrate and non-magnetic residues are obtained; carrying out sulfuric acid leaching on the non-magnetic slag, filtering to remove impurities to obtain neodymium-rich leachate, treating the leaching residues with hydrochloric acid, and roasting to recover calcium; and oxalic acid is added into the neodymium-rich lixivium for precipitation, a neodymium oxalate product is obtained, and neodymium oxalate is roasted to obtain a neodymium oxide product. The method is simple in process and low in medicament consumption, and realizes efficient separation and comprehensive utilization of iron, calcium and rare elements.

The invention discloses a green, environment-friendly and efficient vanadium extraction method, and relates to a roasting additive and a roasting process thereof, and the method is realized by the following steps: mixing vanadium slag and a calcium oxalate additive, roasting, and treating the roasted clinker with acid to obtain a vanadium ion-containing solution and low-solubility residues; and treating the vanadium-containing ion solution to obtain a vanadium product with high vanadium content. According to the method, vanadium in the vanadium slag can be efficiently and rapidly separated and purified, an existing vanadium extraction process is simplified, the yield of vanadium is increased, the temperature and time needed by roasting the vanadium slag through a traditional calcium method are reduced, the risk of percolation of vanadium extraction tailings through a traditional sodium method is reduced, and the problems that in the traditional vanadium slag vanadium extraction process, the vanadium extraction rate is low, energy consumption is high, and the process is complex are solved; no harmful waste is discharged in the whole process, and no hexavalent chromium leakage risk exists in the leached tailings. The method is simple in process, energy-saving, environment-friendly, high in operability and wide in application prospect.

The invention provides a method for extracting cesium by roasting pollucite, and belongs to the technical field of cesium ore smelting. The method comprises the following steps: mixing pollucite, a composite chlorinating agent and a chlorine fixing agent, roasting to obtain clinker, mixing the clinker with water, and leaching to obtain leaching residues and a leaching solution; step-by-step crystallization is conducted on the leachate, precipitated salt and primary purified liquid are obtained, and the precipitated salt serves as a composite chlorinating agent and returns to the front end to be roasted; calcium and magnesium are removed from the primary purification liquid, calcium and magnesium removed slag and secondary purification liquid are obtained, and the calcium and magnesium removed slag returns to the front end to be roasted; and adjusting the pH value of the secondary purified liquid, and extracting and separating lithium, rubidium and cesium. According to the method, the high cesium extraction rate is achieved, no chlorine tail gas is generated, and meanwhile recycling of waste residues generated in the process is achieved; meanwhile, the method disclosed by the invention is simple in process flow, safe, simple and convenient to operate and small in dosage of auxiliary materials, and has a wide application prospect.

This utility model relates to the field of cement production technology, and in particular to a cement kiln that uses waste tires as fuel for cement clinker calcination. It includes a base, with the main body of the cement kiln fixedly installed on the top of the base. A burner is fixedly installed on the right side of the base, and a feeding cylinder is fixedly installed on the top of the burner. A drive motor is fixedly connected to the top of the feeding cylinder, and the output end of the drive motor passes through the inner cavity of the feeding cylinder and is fixedly connected to a crushing shaft. This utility model can treat exhaust gas. During use, the exhaust pipe guides the exhaust gas, and during this guidance, the water in the recovery box recovers and treats the exhaust gas. Simultaneously, the exhaust gas is introduced into the treatment box, allowing the filter plate, filling box, and adsorption packing material to treat the exhaust gas. Furthermore, during use, the feeding cylinder, drive motor, crushing shaft, and spiral shaft guide tire material into the burner, enabling the use of waste tires as fuel.

The application discloses a kind of phosphogypsum preparation sulfuric acid coproduction mine filling cementitious filling methods, raw materials include phosphogypsum clinker and other materials, the weight ratio of phosphogypsum clinker and other materials is 1:4 to 10, the other material refers to tailings and waste rock;The sulfur dioxide produced after heating and high-temperature decomposition of phosphogypsum is used to prepare sulfuric acid, and the remaining waste residue is phosphogypsum clinker.The application not only can reduce the cost of mine filling mining, but also is beneficial to reduce the pollution of phosphogypsum accumulation to the surface environment, promote the resource utilization of phosphogypsum, avoid resource waste, and ensure safe and efficient mining of mine.

The invention discloses a method for preparing a ceramic frit from electronic waste. The ceramic frit is prepared from the following raw materials in parts by mass: 40-55 parts of waste electronic glass, 15-27 parts of polishing powder, 8-10 parts of waste aluminum oxide, 6-8 parts of waste desulfurized gypsum, 3-6 parts of a boron-containing modifier, 5-8 parts of waste fuel and 1-3 parts of a mineralizing agent. The method comprises the following steps: stirring and mixing waste electronic glass, polishing powder, waste aluminum oxide, waste desulfurized gypsum, a boron-containing modifier and a mineralizer, adding waste fuel, further stirring and mixing, and then feeding into a granulator for granulation; feeding the prepared particles into a smelting furnace for calcining, wherein the calcining temperature is 1050-1150 DEG C; and carrying out water quenching molding on the molten material to obtain the ceramic frit. The method for preparing the ceramic frit from the electronic waste solves the technical problems of high energy consumption of ceramic frit calcination and resource waste caused by direct treatment of the electronic waste in the prior art.

The application discloses a cement-chemicals co-production system and a control method thereof, and belongs to the technical field of carbon emission reduction and resource utilization in the cement industry. The system comprises a water electrolysis hydrogen production unit, a microwave-assisted hydrogen calcination unit, a cement clinker sintering unit, a synthetic gas purification unit, a synthetic gas proportioning unit, a chemical synthesis unit, a waste heat recovery unit and an automatic control and data monitoring unit. The microwave-assisted hydrogen calcination technology is used to decompose calcium carbonate into CO synthesis gas, oxygen by-product of water electrolysis is used for oxygen-enriched combustion, combined with accurate proportioning of synthetic gas and DCS and artificial intelligence collaborative control, the collaborative production of cement clinker and high-value chemicals is realized. The application reduces the carbon emission of the system by more than 70% compared with the traditional process, reduces the comprehensive energy consumption by more than 30%, the thermal efficiency is greater than or equal to 85%, the synthetic gas conversion rate is greater than or equal to 80%, and the carbon resource utilization rate and production stability are significantly improved, and the application has outstanding economic and environmental benefits.

The application discloses a solid waste-based self-compacting super-waterproof backfill material and a preparation method thereof, and the solid waste-based self-compacting super-waterproof backfill material is formed by mixing and stirring slag and a solid waste-based high-impervious curing agent and water; the solid waste-based high-impervious curing agent comprises steel slag powder, granulated blast furnace slag, fly ash, red mud, industrial by-product gypsum, hydrophobic organic acid salt, alkali metal lactate, high-performance polycarboxylate water reducer and dispersant. Physical-chemical reactions occur in the mixing and stirring, a large amount of cementing bodies are generated in the curing process, the inter-particle pores of soil are filled, the structure is compacted, the strength is high, and the imperviousness is good; the application focuses on the solid waste resource utilization demand, has the advantages of high solid waste utilization rate, low economic cost, high fluidity, good waterproof performance and the like; and the application changes the need of adding cement clinker in traditional backfill materials, and is more economical and environment-friendly.

The utility model discloses an organic polluted soil thermal desorption synergistic remediation system which comprises an organic polluted soil thermal desorption remediation system, a cement clinker production line, an exhaust fan I, a dust collector I, an exhaust fan II, a calcium hydroxide water tank and a sintered soil reservoir. The organic polluted soil thermal desorption repair system comprises an organic polluted soil thermal desorption system, an organic pollutant dry desulfurization lime powder preparation system and an organic polluted soil thermal desorption fuel preparation system. The utility model relates to the technical field of polluted soil remediation, and the organic polluted soil thermal desorption system shares a set of complete environment-friendly system with the existing dry kiln for normal production, so that the organic polluted soil thermal desorption system has more advantages that firstly, the organic polluted soil thermal desorption system has higher treatment efficiency on harmful waste gas generated in the polluted soil remediation process and can realize ultralow emission; 2, the investment and operation cost of environmental protection equipment of the polluted soil thermal desorption system can be saved; and thirdly, pollutant emission can be managed and controlled in a centralized and unified manner, and pollutant emission sources are reduced.

The present application relates to the technical field of building materials, and particularly relates to a low-carbon high-anti-cracking cementitious material for mass concrete and a preparation method thereof, wherein the cementitious material comprises, by weight, 81-85 parts of a cementitious component, 3.2-3.8 parts of an activator, 5.5-5.8 parts of a shrinkage compensation component and 4-5.3 parts of a performance adjusting component. The present application uses a large amount of fly ash, slag powder and steel slag powder, which are industrial solid wastes, so that the amount of cement clinker is reduced to less than 30%, and compared with the traditional cementitious material, the carbon emission is reduced by more than 50%, and a large amount of industrial waste is absorbed, which meets the development direction of green building materials.

The application provides a low-carbon slag cement and a preparation method thereof, and the low-carbon slag cement comprises the following components: 70-90 parts of mineral powder, 5-25 parts of Portland cement clinker, 5-15 parts of iron tailings, 1-5 parts of desulfurization gypsum, 0.0005-0.002 parts of a stand mill grinding aid component, 0.0005-0.002 parts of a grinding aid reinforcing component and 0.0005-0.002 parts of a dispersing component. Compared with the prior art, the application reasonably matches the types, dosages and particle sizes of the cementitious materials, optimizes the initial slurry structure, matches the hydration processes of the materials with each other, and obtains the low-carbon cement with low clinker dosage and good performance. The application stimulates the fine mineral powder particles with a small amount of clinker fine powder, avoids the problem of high water demand caused by the rapid hydration of a large amount of clinker fine particles, fully stimulates the hydration of the fine slag powder particles, and ensures the early strength of the low-carbon cement. In addition, the application reasonably utilizes a large amount of waste silica powder, slag and iron tailings, and is low-carbon and environmentally friendly.

This application provides a method and product for preparing a composite coal-saving synergist for cement clinker using undisturbed fluorine-containing sludge and other solid wastes in a synergistic and low-energy-consumption manner. Fluorine-containing sludge, steel slag, municipal solid waste incineration fly ash, nickel-iron slag, and aluminum ash slag are used as main raw materials. Through a series of processes including raw material pretreatment, pre-homogenization, material proportioning design, extrusion granulation and activation-induced product formation, coagulation, self-hardening, self-curing, and self-drying, a composite coal-saving synergist for calcining high-quality cement clinker is prepared. This method avoids the drawbacks of high energy consumption and inefficient utilization of dried fluorine-containing sludge during the drying process. It fully utilizes the effective components in various solid wastes, including fluorine-containing sludge, to achieve synergistic effects, enabling large-scale, low-energy, and high-efficiency treatment of fluorine-containing sludge and other industrial solid wastes.

The invention relates to the technical field of construction materials, in particular to a clean preparation method of Portland cement clinker for concrete, which is characterized in that coal gangue and ardealite are used as raw materials, and low-heat Portland cement clinker is prepared by a preparation process of'low-temperature calcination + hydrothermal synthesis + low-temperature calcination '. The method comprises the following steps: S1, pretreatment; S2, ingredient design; s3, carrying out primary calcination; s4, carrying out hydrothermal synthesis; s5, carrying out secondary calcination; the Portland cement clinker is prepared from industrial solid wastes such as coal gangue and ardealite as raw materials, remarkable environmental protection and resource utilization benefits are achieved, clay and limestone are replaced with the solid wastes, ecological damage caused by mining is reduced, energy consumption is greatly reduced through the low-temperature calcination process compared with traditional cement production, no carbon dioxide is discharged in the whole process, and the method is environmentally friendly. The prepared low-heat Portland cement clinker takes dicalcium silicate and dicalcium aluminosilicate as main minerals, solid waste resources are fully utilized, and the ecological environment is facilitated.