519 results about "Clinker (waste)" patented technology

The invention discloses a method for preparing a solid waste cementing material from micro-carbonized steel slag, and belongs to the technical field of building materials. The preparation method comprises the following steps: carrying out crushing, iron separation and grinding treatment on steel slag particles to obtain steel slag powder; mixing the steel slag powder with water and a carbonization aid to obtain a steel slag wet mixture; feeding the wet steel slag mixture into a carbon dioxide curing kettle for curing and intensely stirring, quickly carbonizing to obtain micro-carbonized steel slag particles, and grinding and drying to obtain micro-carbonized steel slag powder; 45-70 parts of micro-carbonized steel slag, 15-35 parts of slag, 1-8 parts of gypsum, 1-8 parts of cement or clinker, 1-15 parts of fly ash or metal tailings, 1-10 parts of an alkaline solution and 25-30 parts of water are mixed to obtain the micro-carbonized steel slag solid waste cementing material. The micro-carbonized solid waste steel slag cementing material prepared by the invention has the advantages of low cost, simple preparation process and equipment, better early and later mechanical properties, good stability, low carbon, high additional value and the like.

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 method for selectively extracting rubidium from lithium ore tailings in a short process, and relates to the field of comprehensive utilization of mineral waste. The method comprises the following steps: grinding the lithium ore tailings into powder; adding an additive into the lithium ore tailing powder, and fully stirring and mixing; roasting the mixture to obtain a calcined clinker; directly carrying out water leaching on the calcined clinker; rubidium enrichment liquid and leaching residues are obtained from the leaching liquid through solid-liquid separation; the rubidium extraction composite material is mixed with rubidium enrichment liquid, and selective adsorption of rubidium is achieved; and recycling the composite material, and the like. According to the method, efficient selective recovery of rubidium in the lithium ore tailings is achieved, the water leaching time is shortened, the water leaching temperature and the rubidium extraction roasting reaction temperature are reduced, the separation efficiency of impurities in the lithium ore tailings and the selective recovery efficiency of the rubidium element are remarkably improved, and efficient selective recovery of rubidium in the lithium ore tailings is achieved.

The invention relates to the technical field of expansive soil treatment, and particularly discloses an expansive soil rapid hardening material as well as a preparation method and application thereof. The invention discloses an expansive type rapid hardening material for soil. The expansive type rapid hardening material is prepared from the following components: high belite sulphoaluminate cement clinker, ordinary Portland cement, gypsum, solid waste high-activity superfine powder, a nano crystal nucleus induction activating agent, a nano modified complexing agent and a modified early strength agent, the nano crystal nucleus induction activating agent is prepared from nano Al2O3, sodium dodecyl benzene sulfonate, NaOH and Na2SiO3; the nano modified complexing agent is prepared from nano SiO2, lauryl sodium sulfate and silane; the modified early strength agent is prepared from modified graphene oxide, Na2SiO3 and water. According to the technical scheme, the solid waste can be recycled, the expansive soil treated by the hardening material can achieve the effects of high hour strength and good water stability, and the curing speed and the production efficiency are greatly improved.

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 discloses an iron tailing-based all-solid-waste clinker-free cementing material and a preparation method thereof, and belongs to the technical field of building materials. The cementing material comprises the following components in parts by weight: 30-50 parts of activated iron tailings, 10-20 parts of steel slag, 20-40 parts of mineral slag, 5-20 parts of phosphogypsum and 5-20 parts of an activating agent; a preparation method of the activated iron tailings comprises the following steps that the iron tailings and the red mud are mixed, then an alkaline solution is added, alkali-heat combined treatment is conducted for 2-6 h at the temperature of 150-230 DEG C after even mixing, and the activated iron tailings are obtained after drying. According to the method, the activity of the iron tailings and the red mud is improved through component complementation in the iron tailing activity excitation process, the dosage of NaOH in the alkali-heat excitation process is reduced, and the cementing material with high hydration activity is prepared through multi-source solid waste synergistic interaction in the clinker-free cementing material preparation process.

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 discloses a method for preparing low-carbon cement based on construction wastes, which comprises the following steps: carrying out deep hydrothermal reaction on the construction wastes by using an autoclave under high-temperature and high-pressure conditions, so that silicon-aluminum minerals in the construction wastes are subjected to more thorough hydrothermal rearrangement to generate more stable hydrated silicate and aluminosilicate; the reaction activity of the clinker can be improved at the subsequent lower calcining temperature, so that the utilization rate and the high activity of complex components such as the building wastes in the cement preparation process are realized. The low-carbon cement disclosed by the invention is relatively high in later compressive strength and breaking strength, the strength grade of the low-carbon cement is 32.5, and the low-carbon cement meets building requirements and can be widely applied to the fields of buildings, roads and the like. According to the invention, closed cycle of solid waste-material is realized through waste recycling, and double innovation of material performance and ecological benefit is achieved.

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 invention discloses a solid-waste-based low-calcium clinker prepared from industrial solid wastes at low temperature and a method, which comprises the following steps: grinding a calcium raw material, a siliceous raw material, an aluminum correction raw material, an iron correction raw material and gypsum as raw materials, and fully mixing in proportion to obtain a homogeneous mixed raw material; calcining the mixed raw material at low temperature, quickly cooling after calcining, and grinding to obtain solid waste-based low-calcium clinker; the mineral phase of the cement clinker comprises 45-50% of calcium sulphosilicate (C5S2), 25-35% of calcium sulphoaluminate (C4A3), 10-15% of an iron phase (C6AF2) and the balance of unreacted raw materials and calcium aluminate in different forms. The CaO content required by the clinker prepared by the method disclosed by the invention is 45-48% and is about 17-20% lower than the CaO content (more than 65%) in ordinary Portland cement clinker. Finally, the carbon emission generated by limestone decomposition is significantly reduced. The low-calcium cement clinker prepared by the invention has the advantages of good burnability, low firing temperature, good grindability and excellent early compressive strength.

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 belongs to the technical field of preparation of building materials, and particularly relates to clinker-free slag cement and a preparation method thereof. The clinker-free slag cement is prepared from the following raw materials in parts by weight: 8-15 parts of industrial solid waste fluorgypsum; 1-3 parts of sodium hydroxide; 10 to 20 parts of fly ash; 5 to 20 parts of lithium slag powder; 10 to 20 parts of slag; 45 to 65 parts of mineral powder; 0.5 to 2 parts of quick lime; and 1-2 parts of sodium silicate. According to the cement disclosed by the invention, by limiting the ratio of the raw materials and matching the components with one another, the prepared cement meets the technical requirements of P.S.A42.5-grade cement.

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.

The invention relates to an alkali-activated solid waste cementing repair material and a preparation method thereof, and belongs to the technical field of solid waste resource utilization and building materials. The repairing material is prepared from the following raw materials in parts by weight: 30 parts of fly ash, 70 parts of blast furnace slag, 40 parts of machine-made sand, 45-50 parts of water, 7-13 parts of an exciting agent, 1-2 parts of sodium tetraborate, 1-2 parts of calcium oxide, 1-2 parts of magnesium oxide, 1-2 parts of calcium sulphoaluminate, 0.5 part of aluminum oxide, 0.2 part of aluminum potassium sulfate, 0.2 part of aluminum powder, 0.2 part of alunite and 1 part of polyethylene glycol. By optimizing the modulus of the exciting agent, the alkali content, the water-binder ratio and the admixture ratio, the material has the shrinkage-compensating and micro-expansion characteristics, the compressive strength of the material in one day reaches 25-30 MPa, the compressive strength in three days reaches 30-35 MPa, the compressive strength in seven days reaches 35-40 MPa, the compressive strength in 28 days reaches 45-50 MPa, the initial fluidity and the 30min fluidity meet the standard requirements, and the expansion rate is 0.1%. The concrete is completely prepared from industrial solid wastes, does not contain cement clinker, has excellent volume stability and durability, is suitable for repairing roads, bridges and building structures, and is particularly suitable for severe environments such as high humidity, salt mist, freeze thawing and the like.

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 cement, in particular to quick-setting environment-friendly high-strength cement and a preparation process thereof. The preparation method comprises the following steps: 1, grinding and mixing limestone, high-silica soil, an iron material, an aluminum material and phosphorus slag to obtain a raw material; calcining and cooling the raw material to obtain cement clinker; 2, cement clinker, limestone, clay, the modified phosphorus slag, an accelerator and an additive are ground and mixed, and the high-strength cement is obtained. The accelerator is prepared from aluminum sulfate and calcium carbonate according to the mass ratio of (2.4 to 3.2): (0.6 to 0.8); the additive comprises the following components in parts by mass: 8-10 parts of modified fiber and 1-2 parts of cyclodextrin MOF. According to the scheme, the phosphorus slag is introduced into the cement for waste utilization, silica sol is used for modifying the cement, and the accelerator and the additive are introduced, so that the defects of the cement are effectively overcome, and the rapid hardening property and the mechanical strength of the cement are enhanced.

The present invention relates to the technical field of waste resource utilization, and in particular to a method for recycling perfluorocarbon waste. Perfluorocarbon waste is pre-treated, and then mixed with auxiliary materials at a mass ratio of 1:1-5 for perfluorocarbon waste: auxiliary materials to obtain a solid material to be treated; the solid material to be treated is mixed with cement raw material, and sintered at 1400-1500°C to obtain a clinker as a cement raw material; wherein the physical form of the perfluorocarbon waste is liquid or solid; and the auxiliary materials are selected from at least one of coal powder, quicklime powder, charcoal powder, slaked lime powder and cement clinker powder. The recycling method of the present invention can convert perfluorocarbon waste into primary minerals such as calcium fluoride as components in clinker, with low recycling cost and high efficiency.

The invention provides a coal-based solid waste cementing material for coal mine filling engineering and a preparation method and application thereof.The preparation method comprises the steps that coal-based solid waste comprises, by weight, 30-60 parts of fly ash, 20-40 parts of furnace bottom ash and 20-30 parts of gasification slag, and the coal-based solid waste is mixed and ground under the action of a grinding aid to obtain a mixture A; wherein the mass of the grinding aid is 0.1-0.5% of that of the coal-based solid waste; preparing the mixture A into a solid waste solution with the mass concentration of 20-40% by using a solvent, and introducing carbonized gas into the solid waste solution to obtain an acidified solution; and mixing and grinding 30-60 parts by weight of desulfurized gypsum, 30-50 parts by weight of lime and 10-20 parts by weight of cement clinker to obtain a mixture B, adding the mixture B into the acidizing solution, and uniformly stirring and mixing to obtain the coal-based solid waste cementing material. The coal-based solid waste cementing material disclosed by the invention is wider in application scene, and meanwhile, the goaf filling cost is effectively reduced, and the coal-based solid waste absorption efficiency is improved.

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.