184 results about "Lime" patented technology

The invention relates to the technical field of lime shaft kilns, in particular to a full-automatic Kawasaki rotating lime shaft kiln device, and aims to solve the problems that during combustion of an existing lime shaft kiln, due to the fact that flame heat is concentrated on a local part, a disordered and uniform temperature field cannot be formed, and the calcination temperature of limestone is not uniform; limestone processing is achieved through the combustion mechanism on the supporting seat, the soaking assembly in the thermal insulation shell guides materials and cooperates with the combustion assembly for preheating, a flame jet device of the combustion assembly jets flames, the flames act with heating gas blown out by the high-pressure air pump to form a uniform temperature field, and the material guiding plate guides the materials to enter the rotating processing part. And the processing component disperses the materials through the rotating and material uniformizing assembly, so that the limestone is uniformly heated, and the uniform effect during limestone calcination is improved.

The invention relates to the technical field of river sludge solidification, in particular to a river dredging sludge solidification treatment device which comprises a box body, a sludge pipe is fixedly installed on the box body, a mixing assembly is fixedly installed at the end, located in the box body, of the sludge pipe, a solidification assembly is fixedly installed on the box body, and the solidification assembly is located below the mixing assembly; external lime powder enters the lime pipe in an air blowing mode, sequentially passes through the air shell and the particle pipe and enters the uniform distribution pipe, the lime powder is sprayed to the bottom of the mixing tank through the powder nozzles on the surface of the uniform distribution pipe to complete distribution of the lime powder, and then the output end of the distribution motor drives the crankshaft to rotate. The sliding rod drives the abutting plate to move downwards, the abutting plate drives the soft rubber sealing plug to move downwards, the soft rubber sealing plug is separated from the inner wall of the mixing tank, sludge flows in along the inner wall of the mixing tank and makes contact with lime powder at the bottom to be fused, the water content of the sludge is reduced, the sludge is pretreated, and the subsequent chemical curing effect is improved.

The invention provides a comprehensive analysis method for compaction quality of a lime treated soft soil roadbed based on intelligent compaction. The method comprises the following steps: S1, acquiring vibration modulus data corresponding to a plurality of detection units respectively; s2, calculating a compaction degree passing rate and a stability passing rate based on the vibration modulus data corresponding to the plurality of detection units, obtaining a uniformity passing rate by adopting a multi-scale variation structure analysis method, and calculating an abnormal aggregation index through a DBSCAN clustering algorithm; s3, determining the weight of each index, wherein the weight comprises the weight of the compaction degree passing rate, the weight of the uniformity passing rate and the weight of the stability passing rate; s4, calculating a compaction quality value based on each index and the corresponding weight; s5, the roadbed compaction quality grade is judged based on the compaction quality value, and roadbed repairing is conducted based on the roadbed compaction quality grade and the abnormal aggregation index. Compared with the prior art, the method has the advantages of improving the spatial resolution and defect identification precision of uniformity detection of the roadbed compactness and the like.

The utility model relates to the technical field of lime powder processing impurity removing devices, in particular to a lime powder processing impurity removing device which is characterized in that iron ore in lime is adsorbed by starting a magnetic attraction mechanism in the lime conveying process and discharged, lime powder is discharged into a screening mechanism, and the screening mechanism is used for screening the lime powder. The auxiliary mechanism and the screening mechanism are started to be matched to screen the lime powder, and the auxiliary mechanism adsorbs scrap iron in the lime powder and discharges the scrap iron, so that the practicability of the equipment is improved; comprising a crushing mechanism; the crushing mechanism and the magnetic attraction mechanism are installed above the conveying mechanism, the magnetic attraction mechanism is located on the right side of the crushing mechanism, the rolling mechanism is located on the right side of the conveying mechanism, the rolling mechanism is installed at the top end of the screening mechanism, and the auxiliary mechanism is installed at the top end of the screening mechanism; the auxiliary mechanism is located on the right side of the rolling mechanism.

The present application relates to the technical field of building materials, in particular to a thermodynamic modified material for grotto rock mass fissure grouting and a preparation method thereof, which comprises the following components in a mass ratio: lime-based material 100-200 parts; quartz sand 30-50 parts; metakaolin 30-70 parts; calcium aluminate expansive agent 10-20 parts.The present application has the advantages of optimized thermal conductivity, controlled thermal expansion coefficient, improved microstructure and comprehensive performance.The thermal conductivity of the lime-based grouting material is higher than that of traditional tung oil materials, reducing thermal stress concentration caused by temperature gradient;the thermal expansion coefficient can be changed from negative to positive by adjusting the water-cement ratio and the amount of expansive agent, and tends to be close to the limestone rock mass, reducing the risk of interface peeling;the optimized material has higher crystallinity and denser structure, reducing microfissures and improving heat conduction efficiency;while maintaining high mechanical strength and durability, the material realizes directional modification of thermodynamic properties, providing technical support for long-term preservation of grottoes.

The application relates to an aerated concrete prepared from granite waste rock powder and a preparation method thereof. The aerated concrete of the application takes granite waste rock powder (skeleton effect), calcium carbide slag (calcic material), clay (sintering promotion), red mud (gel filling) and coal gangue (siliceous material) as core raw materials, replaces traditional natural sandstone and lime, realizes industrial solid waste resource utilization, conforms to the development direction of green building materials, and significantly reduces the dependence on natural resources.

The application discloses a device and a production method for producing low-sulfur and low-chlorine lime powder by calcining limestone powder, and belongs to the field of limestone powder production and steelmaking. The decomposition furnace is divided into a high-temperature oxygen-deficient combustion region, a first limestone decomposition region and a second limestone decomposition region. A high-temperature oxygen-deficient CaO-free environment is created in the high-temperature oxygen-deficient combustion region, so as to promote the volatilization of residual KCl and NaCl, and then the residual KCl and NaCl are discharged through bypass air release technology. Limestone is added in the first decomposition region for decomposition, and combustion-supporting air is added in the second limestone decomposition region for strengthening combustion effect. In this way, the decomposition rate of limestone can be improved, the quality of steelmaking lime can be improved, and the steelmaking cost can be reduced.

The invention provides a preparation method of goethite-boron complex minerals for soil improvement, and belongs to the technical field of preparation of artificial minerals for soil improvement, the preparation method comprises the following steps: 1, mixing solutions; 2, stirring the mixed solution; 3, dropwise adding a sodium hydroxide solution; step 4, centrifugal washing; 5, drying the precipitate; and 6, grinding and screening. According to the goethite-boron composite artificial mineral prepared through the method, the boron loss rate is reduced, the boron slow release performance is improved, the ecological environment effect is improved, the boron fertilizer utilization efficiency is improved, iron nutrition is synchronously provided, and the iron deficiency symptom of calcareous soil is relieved.

The application provides a heat transfer device of a heavy ash powder flow cooling alkali machine, which comprises a screw rod and a blade, the inner cavity of the blade is communicated with the inner cavity of the screw rod, a pipe fitting is arranged on the blade, and movable blocks are screwed into the two ends of the pipe fitting. The application can change the contact area between the inner wall of the two ends of the pipe fitting and the material by changing the screwing depth of the movable blocks in the pipe fitting, so that the heat exchange efficiency can be further improved.

This invention provides a method, apparatus, and equipment for predicting the amount of hydrated lime input outside the furnace in a two-stage combined desulfurization process, relating to the field of desulfurization control technology. The method includes: acquiring desulfurization operating parameters, including coal quality characteristics, the amount of limestone input in the boiler, the actual amount of hydrated lime input in the desulfurization tower, the actual SO2 concentration at the boiler outlet, and the actual SO2 concentration at the desulfurization tower outlet; using the desulfurization operating parameters as input, determining the desulfurization operating condition category corresponding to the desulfurization operating parameters through a pre-trained desulfurization operating condition prediction model; and calling the hydrated lime input prediction model corresponding to the determined desulfurization operating condition category, using the amount of limestone input in the boiler, the actual SO2 concentration at the boiler outlet, and the pre-determined target SO2 concentration at the desulfurization tower outlet as input, and predicting the target amount of hydrated lime input in the desulfurization tower through the hydrated lime input prediction model. This invention is based on modeling for combined in-furnace and out-of-furnace desulfurization, realizing the prediction of the amount of hydrated lime input outside the furnace.

The application discloses a suspension calcining system with a CO2 partial pressure reduction function and a method for preparing high-activity lime, and belongs to the technical field of lime stone calcination. The system comprises a pretreatment unit, a calcining unit, a cooling unit, a dust removal unit, a CO2 treatment unit and a product bin. The steps for preparing high-activity lime are as follows: after crushing the lime stone raw ore, the lime stone powder is added into a lime stone powder feeding bin, is fed into a cyclone preheater for three-stage preheating, is added into a suspension calcining furnace for calcination, air is introduced into the bottom of the calcining furnace during the calcination process, and the powder is ensured to be in a suspension state at all times; the powder after the calcination is sent into a cyclone cooler for three-stage cooling, and high-activity lime is obtained. In the process of preparing high-activity lime, the powder is heated more uniformly, the heat transfer efficiency is higher, the flowing gas timely discharges the CO2 generated by the decomposition, the CO2 treatment equipment is used for separation, the lime stone decomposition is moved to a positive direction, the decomposition speed is accelerated, and the decomposition efficiency is improved.

The utility model relates to the technical field of calcium carbonate production, in particular to a raw material flushing device for calcium carbonate production, which comprises a base and a washing screen drum mechanism, the top of the base is fixedly connected with a butt joint frame, the washing screen drum mechanism is rotatably connected with the butt joint frame, a screen plate and a material receiving frame are slidably connected to the top of the base, and one side of the material receiving frame is rotatably connected with a regulation and control plate. The feeding hopper is movably arranged at the top of the base, the regulating module is arranged at the top of the base and used for driving the sieve plate to vibrate in a reciprocating mode, and the driving module is arranged at the top of the base. According to the limestone cleaning machine, the top of the base is connected with the material receiving frame in a sliding mode, the feeding hopper transversely moves in a reciprocating mode to evenly feed limestone into the material receiving frame, the material receiving frame moves downwards in a reciprocating mode and is impacted by the transverse plate to promote mud to fall off, the limestone is fed to the top of the screen plate to screen away most of marl, and most of the marl is stripped before cleaning; the subsequent cleaning effect is optimized, the cleanliness of limestone is higher, it is guaranteed that produced calcium carbonate is good in quality, and use is convenient.

The present application relates to the technical field of steelmaking auxiliary materials, in particular to a method for improving the balling rate of molybdenum oxide composite briquetting, in which process, in order to control the material temperature and overcome the problem of reaction heat release in the material, raw dolomite or limestone particles which are not easy to react with water are used to replace the traditional inhibitor lime, and the chemical reaction heat production is effectively controlled; the briquetting process provided by the present application adjusts the conventional one-time stirring and mixing to twice stirring, dry ice is added for cooling during the stirring process, and each time after stirring, standing is carried out, and through the above measures, the problem of material heating caused by the heat generated by material stirring and chemical reaction and then causing the problem of cracked briquetting after briquetting can be effectively solved. The balling rate of the molybdenum oxide composite briquetting for steelmaking produced by the process reaches more than 90%, the breaking strength is greater than 600N, and the falling strength is more than 15 times / (0.5m).

The utility model relates to the technical field of calcium oxide flue gas dust removal equipment, and discloses flue gas dust removal equipment for calcium oxide production, which comprises a box body, a gas inlet pipe arranged on one side of the box body, an exhaust pipe arranged on the other side of the box body, an ionizer control cabinet arranged at the top of the box body, and a plurality of distribution plates connected with the ionizer control cabinet, a dust collecting plate controller is arranged on one side of the ionizer control cabinet and fixedly connected with a connecting wire, the connecting wire is fixedly connected with a dust collecting plate, an upper support is arranged at the top of the dust collecting plate, a lower support is arranged below the dust collecting plate, a concentration plate is arranged on one side of the lower support and rotationally connected with a connecting shaft, and a spring is arranged on the outer side of the connecting shaft in a sleeving mode. One end of the connecting shaft is rotatably connected with a striking plate which is in frictional contact with a synchronizing shaft, and one end of the synchronizing shaft is fixedly connected with a motor; therefore, the impact force in the striking process is effectively absorbed, the force directly acting on the connecting part of the dust collecting plates is reduced, and the risk of fracture of the connecting part is greatly reduced.

The utility model discloses a drop point marking device for tracking and identifying a flying rock trajectory in foundation pit blasting, and aims to solve the problems that a shovel and white lime are used for marking in existing foundation pit blasting, local thick and thin marking lines are not uniform, and great material waste is caused. The device comprises a storage hopper and a discharge port formed in the bottom end of the storage hopper, a fixing plate is fixedly connected to the bottom end of the storage hopper, racks are fixedly connected to the left side and the right side of the upper surface of the fixing plate, an arc-shaped groove is formed in the lower surface of the fixing plate and communicates with the discharge port, and two side plates are fixedly connected to the left side and the right side of the lower surface of the fixing plate. By arranging the storage hopper, the rack and the rolling wheel, when the lime marking device is used, lime is poured into the storage hopper, then the device is pulled to rotate around the rolling wheel, and the lime in the storage tank can uniformly fall on the ground at the moment, so that the marked lime white line is more uniform, the waste of materials is avoided, and the lime marking device is very convenient to use.

The application relates to the technical field of building materials, in particular to a cementing material for preparing an assembled wall body from multiple solid wastes and a preparation method; the cementing material is prepared from 25-55 parts of fly ash, 25-65 parts of blast furnace slag, 8-10 parts of lime, 1-5 parts of desulfurization gypsum, 3-6 parts of a first mixture, 2-5 parts of a second mixture and 5-8 parts of an alkali activator; the mass ratio of metakaolin, bentonite and superfine calcium carbonate in the first mixture is 3:2:1; the mass ratio of vermiculite, expanded perlite and glass beads in the second mixture is 2:2:1. The cementing material has a more stable microstructure through the synergistic activation of Ca and Na, and the addition of the first mixture and the second mixture. 2+ and Na + The C-S-H and C(N)-A-S-H gels form a three-dimensional network, needle-shaped ettringite crystals fill pores, and the anchoring effect of brucite phase is combined, so that the mechanical properties, such as strength and durability, of the material are significantly improved.

The application discloses a method for carbonization coating solidification / stabilization of industrial solid waste building material utilization. The method is as follows: crushing, grinding and screening industrial solid waste and high calcium solid waste or raw / cooked lime; mixing industrial solid waste with high calcium solid waste or raw / cooked lime; adding water into a carbonization reaction container for multiple times, and uniformly dispersing; introducing CO2-containing gas into the bottom of the carbonization reaction container to react with the dissolved high-quality solid waste calcium source, so that the generated calcium carbonate crystals grow on the surface of the industrial solid waste, the industrial solid waste is coated and solidified, and after being static, solid-liquid separation is performed, the content of pollutants in the liquid is determined, and it is ensured that secondary water pollution is not caused, and meanwhile, the solid is dried and dispersed to obtain the carbonization coating modified industrial solid waste product; and the dispersed modified industrial solid waste product is used as aggregate to prepare sustainable low-carbon concrete, and curing and form removal are performed, and the sustainable low-carbon concrete is obtained. The method has the characteristics of low cost, high strength, simple operation and solidification and stabilization of all types of pollutants.

The invention relates to the technical field of lime production, in particular to a double-hearth shaft kiln material level automatic adjusting system and method based on image processing, and the system comprises a high-temperature industrial endoscope, a lens alignment refractory brick, a PLC control system, a differential supporting plate discharging device and a hydraulic system; the lens alignment refractory brick is arranged on the side wall of the top of the kiln chamber and coincides with the horizontal center line of the kiln chamber. The high-temperature industrial endoscope is arranged on the opposite side of the lens alignment refractory brick to ensure that a complete limestone charge level can be contained in the visual field of the lens, and the lens alignment refractory brick is located at the vertical position in the visual field of the lens, so that the axis of the lens coincides with the horizontal center line of the kiln chamber; the differential supporting plate discharging device is located under a discharging port of the shaft kiln, 6-8 supporting plates are evenly arranged in the circumferential direction, and each supporting plate can independently conduct vibration discharging. According to the method, the height of each area of the material surface is calculated and adjusted in real time, so that the limestone material surface is smoother, the calcination time of each part of the limestone material is more uniform, and the underfiring rate and the overfiring rate are reduced.

The invention relates to the field of mineral processing, and provides a method for reducing the content of sulfur in iron ore concentrate, which comprises the following steps: preparing the iron ore concentrate into ore pulp with the mass fraction of 30-50%; s2, the ore pulp in the step S1 is pretreated, and the pretreatment mode is ultrasonic treatment or hydraulic cavitation treatment; the ore pulp pretreated in the step S2 is subjected to flotation operation, sulfur-containing foam is obtained through flotation, low-sulfur concentrate is obtained, and the remaining product is desulfurized iron ore concentrate; the flotation reagent comprises a conditioning agent, a collecting agent and a foaming agent, the conditioning agent comprises lime and copper sulfate, the collecting agent is amyl xanthate, and the foaming agent is methyl isobutyl carbine.According to the method, ultrasonic or hydraulic cavitation pretreatment is combined with the flotation reagent, the floatability of pyrrhotite in the iron ore concentrate is improved, and the flotation efficiency is improved; and the sulfur content in the iron ore concentrate is obviously reduced.

The present application belongs to the technical field of industrial pollutant emission control and solid waste treatment, and particularly relates to a fly ash in-situ reduction method for waste incineration flue gas purification. A calcium-based composite powder is sprayed into a region with a temperature of 850-950 DEG C in the waste incinerator hearth by a spraying device. In the temperature zone, the active components in the calcium-based composite powder rapidly react with the acid gases such as SO2, HCl and HF in the flue gas to generate a dense slag precursor, which is mainly a stable high-density mineral phase such as CaSO4. The precursor does not rise with the flue gas due to its high density, high melting point and no low-melting-point adhesive layer on the surface, but directly sinks to the grate, and finally is discharged with the slag, thereby reducing the amount of fly ash entering the subsequent flue gas purification system at the incineration source. At the same time, the technology forms a synergistic effect with the post-furnace semi-dry / dry deacidification process: most of the acid gases are removed in the furnace, the consumption of lime in the downstream is greatly reduced, and the generation of secondary fly ash is further reduced.

This invention discloses a lime slurry reuse system and method, relating to the field of industrial waste recycling technology. The system includes a sedimentation tank for settling impurities in the lime slurry and controlling its calcium hardness; a sludge tank connected to the sedimentation tank for receiving the settled lime slurry; and a mixing tank connected to the sedimentation tank and the sludge tank for receiving lime slurry from both tanks and conveying it to a primary mixer for sintering mixing. By magnetically separating and settling the lime slurry used in the cast iron machine, iron impurities are removed, and the calcium hardness range of the lime slurry is controlled. The heated lime slurry is then conveyed to the primary mixer to replace part of the quicklime in the sintering mixing process, effectively treating solid waste, solving environmental problems, and further reducing the amount of quicklime required.

The invention provides an excitation material for a low-concentration high-tail-mud-content all-tailing cementing curing agent and a preparation method of the excitation material, and belongs to the technical field of mining solid waste resource utilization and novel building materials. The excitation material comprises the following components in percentage by weight: 20%-40% of an active silicon-aluminum precursor, 30%-50% of anhydrous gypsum, 10%-20% of quick lime, 5%-15% of modified bentonite, 1%-5% of sepiolite, 5%-10% of heavy calcium carbonate powder and 1%-5% of composite alkali liquor. The excitation material breaks through the solidification bottleneck of the high-mud tailings through double mechanisms of composite excitation and ion slow release, effectively solves the problems of poor cementation solidification effect, difficult construction and the like of low-concentration and high-mud-content full tailings, improves the water stability and sulfate corrosion resistance of a solidified body, and is suitable for being applied to the field of filling of the tailings except for conventional tailing filling application scenes. And the method can be expanded to resource utilization of mud-containing wastes such as river mud and shield muck, and has a wide application prospect.

This invention discloses an apparatus for preparing high specific surface area calcium hydroxide, comprising a lime premixing tank and a digestion reactor. The lime premixing tank contains a ribbon agitator connected to a stirring motor at the top of the tank. Steam is conveyed to the premixing tank via a Venturi mixer I. A powder distributor and baffles within the reactor ensure uniform material distribution and gas-solid separation. A closed-loop tail gas treatment system is employed, with a sawtooth distributor and spiral nozzles in the scrubbing tower providing efficient dust removal. Purified wastewater is recycled to Venturi mixer II via a booster pump for reuse. Water is atomized and replenished in the reaction zone via spiral nozzle II to enhance the three-phase reaction. The product settles via baffles and is discharged under control by a rotary valve, then collected after cooling by a screw conveyor. This invention, through a closed-loop design of premixing-steam conveying-tail water reuse-separation, achieves continuous production and efficient resource utilization, significantly improving the specific surface area and production efficiency of calcium hydroxide.

The application provides a recycling method and device of industrial tailings, and relates to the technical field of industrial tailings recycling. The method comprises the following steps: electrolytic manganese slag is mixed with lime or alkali liquor and stirred, ammonia gas is recovered by negative pressure to obtain pretreated manganese slag and ammonia water; shale is crushed, pulverized and aged to obtain aged shale material; water-quenched slag is mixed with coal gangue to obtain mixed auxiliary material; the three are mixed and stirred to form molding raw material, and the molding raw material is molded, dried and sintered at 950 DEG C to obtain manganese slag sintered porous brick. The device comprises an ammonia gas negative pressure recovery system, a stirring unit, a crushing and pulverizing unit, an aging bin, a molding machine, a drying kiln and a sintering kiln. The application removes ammonia nitrogen, reduces pollution, absorbs various industrial tailings, produces ammonia water as by-product, and realizes the recycling of the porous brick.

The utility model relates to the field of building material preparation, and discloses a quick lime and clay mixing device for road roadbed mixing, which comprises a motor, a pre-mixing cylinder, a mixing cylinder and a transportation device, the whole device divides the mixing of clay and quick lime into a pre-mixing process and a mixing process, the pre-mixing process is carried out in the pre-mixing cylinder, and the transportation device is arranged in the mixing cylinder. The stirring process is carried out in the stirring cylinder, so that the device can stir clay and quick lime more uniformly, the two stirring processes can be carried out at the same time, the space utilization rate is increased, the stirring efficiency is improved, and the effects that the clay and the quick lime are mixed uniformly and the stirring efficiency is high are achieved.

The invention discloses an environment-friendly steelmaking furnace, and relates to the technical field of steelmaking, the environment-friendly steelmaking furnace comprises an absorption tank, one side of the absorption tank is driven by a first driving mechanism to rotate, one end of the absorption tank is provided with an air inlet, the other end of the absorption tank is provided with an air outlet, and the air outlet and the air inlet are movably connected with the absorption tank; the gas inlet is communicated with a gas outlet of a steel-making furnace smoke exhaust pipe, waste gas enters the absorption tank through the gas inlet, and the gas outlet is used for discharging purified waste gas; the device has the beneficial effects that slaked lime powder can be continuously turned over in the tank body, so that calcium oxide powder is promoted to fully react with sulfur dioxide, and the sulfur dioxide is ensured to be completely absorbed; after sulfur dioxide absorption is completed, calcium oxide powder after reaction is released; the device can effectively promote sufficient reaction and absorption of calcium oxide powder and sulfur dioxide, ensures sufficient absorption of sulfur dioxide, and facilitates replacement of calcium oxide powder.

Provided herein are processes and systems related to a carbon dioxide sequestration process, comprising a) calcining limestone using a fossil fuel alternative input to form a mixture comprising lime and a gaseous stream comprising more than about 30 vol % carbon dioxide; and b) treating the mixture comprising lime with atmospheric air and allowing carbon dioxide from the atmospheric air to react with the mixture and form a composition comprising calcium carbonate, calcium bicarbonate, or combination thereof. Provided also herein are processes and systems related to a carbon dioxide sequestration process, comprising a) calcining limestone using a fossil fuel alternative input to form a mixture comprising lime and a gaseous stream comprising more than about 30 vol % carbon dioxide; and b) treating the mixture comprising lime with natural water and allowing dissolved carbon dioxide in the natural water to react with the mixture to form a composition comprising calcium carbonate, calcium bicarbonate, or combination thereof.

The invention relates to the field of industrial solid waste steelmaking slag resource regeneration, and discloses a steel slag-based non-metal abrasive and a preparation method thereof, the abrasive comprises the following components: 89wt%-94wt% of molten steel slag, 1.28 wt%-4.68 wt% of iron tailings, and 3.38 wt%-7.71 wt% of lime; the preparation method comprises the following steps: (1) pouring molten steel slag, iron tailings and lime into a tundish, mixing, and uniformly stirring; (2) heating the mixture to 1500-1600 DEG C in the tundish, and then crushing and granulating the molten mixture by using a gas quenching and granulating device to obtain gas-quenched steel slag; and (3) drying the gas-quenched steel slag, and screening to obtain the non-metal grinding material. According to the invention, the industrial solid waste and the auxiliary materials are reasonably and scientifically matched, so that the industrial waste residue is quenched and crushed to produce an amorphous nonmetal product with higher chemical stability, and the amorphous nonmetal product is screened to obtain a nonmetal abrasive product which meets the standard requirements of sand blasting abrasives and has stable performance indexes.

The invention discloses a method for recycling sludge. The method comprises the following steps: conveying low-phosphorus sewage in a water distribution tank and calcium hydroxide emulsion in a first lime emulsion tank to a first reaction tank for precipitation; after precipitation, feeding the sewage into a clarification tank, and adding a flocculant for secondary precipitation; sludge is collected and sent to a sludge concentration tank, and supernate and concentrated sludge containing calcium hydroxide are obtained; treating the supernate through a first neutralizing tank, a softening tank, a second neutralizing tank and an intermediate water tank in sequence; and the concentrated sludge is sent to a second lime emulsion tank of the second sewage treatment system as a calcium hydroxide supply source. The method can reduce sludge discharge, relieve filling contradiction, recover effective calcium hydroxide in the sludge, reduce medicament cost, improve system collaboration and efficiency, and realize cost reduction, efficiency improvement and resource circulation of sewage treatment.