1840 results about "Calcium silicate" patented technology

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

The invention relates to the technical field of cement clinker preparation, and particularly discloses a calcium sulphosilicate mineral clinker with high carbonization activity, a raw material and a preparation method and a hardening method of the calcium sulphosilicate mineral clinker. The clinker is prepared from the following mineral phases: 87.2 to 95.1 percent of calcium sulphosilicate, 2.6 to 9.5 percent of dicalcium silicate and the balance of unreacted raw materials, inevitable impurities and the like. Part of calcium elements in crystal lattices of the calcium sulphosilicate are replaced by at least one of lithium elements, sodium elements, potassium elements and strontium elements. The hardening method comprises the following steps: mixing the calcium sulphosilicate mineral clinker with water, and curing in a carbon dioxide environment to obtain the calcium sulphosilicate mineral hardened body. The mineral clinker disclosed by the invention has excellent carbonization activity, so that the mineral clinker can react with carbon dioxide to obtain high strength, high carbon sequestration is realized, carbon emission is reduced, and the mineral clinker has excellent mechanical properties.

The invention discloses a preparation process of a fireproof lightweight thermal-insulation cement-based mortar material, which comprises the following steps: (1) placing porous lightweight aggregate in a sodium silicate solution for standing, and drying the obtained aggregate to obtain pretreated thermal-insulation aggregate; (2) uniformly mixing silica fume, calcium silicate powder, calcium hydroxide powder and water to form slurry; mixing the pretreated thermal insulation aggregate with the slurry, separating, airing the aggregate, and curing to obtain the primary thermal insulation aggregate. And (3) spraying water on the primary thermal insulation aggregate for wetting, then spraying ethanol containing a silane coupling agent, and airing to obtain the modified thermal insulation aggregate. And (4) uniformly mixing Portland cement, the modified thermal insulation aggregate, basalt fiber and a water reducing agent as raw materials, adding water, and uniformly stirring to obtain the mortar material. According to the invention, the water absorption rate of the porous lightweight aggregate is reduced, so that the adverse effect of the high water absorption characteristic of the aggregate on the mechanical properties of the mortar material is effectively reduced.

The invention provides a waterborne polyurethane enhancer, a cold-resistant and salt-resistant concrete composition as well as a preparation method and application of the cold-resistant and salt-resistant concrete composition, and belongs to the technical field of buildings and civil engineering. The waterborne polyurethane enhancer comprises diisocyanate, oligomer polyol, a small molecule chain extender, oxalic acid dihydrazide, oxaloacetic acid and a catalyst, and the cold-resistant and salt-resistant concrete composition comprises cement, aggregate, a water reducing agent, an anti-freezing agent, an air entraining agent, modified straw fibers, the waterborne polyurethane enhancer, calcium silicate and water. Through mutual cooperation of all the components, the obtained concrete has excellent cold resistance, salt resistance, impermeability and compressive strength, and can meet the engineering requirements for concrete durability and use safety under low-temperature and high-salt conditions.

The invention relates to the field of agricultural microbial preparations, in particular to a complex microbial inoculant sustained-release granule for preventing and treating sweet potato stem nematode disease and a preparation method of the complex microbial inoculant sustained-release granule. Comprising the following components in parts by weight: 15-25 parts of paecilomyces lilacinus viable bacterium powder, 10-20 parts of bacillus thuringiensis viable bacterium powder, 10-20 parts of streptomyces viable bacterium powder, 5-15 parts of bacillus subtilis viable bacterium powder, 15-25 parts of charcoal, 5-15 parts of sodium alginate, 5-15 parts of humic acid, 5-10 parts of chitosan, 3-8 parts of calcium silicate, 1-5 parts of mannitol and 1-5 parts of sodium lignin sulfonate. Four microorganisms with complementary functions, namely paecilomyces lilacinus, bacillus thuringiensis, streptomycete and bacillus subtilis, are adopted, the sweet potato stem nematode disease is synergistically controlled through multiple action mechanisms, and the control effect and the stability are remarkably improved.

The invention discloses a solid waste-based cementitious material, which comprises the following raw materials based on 100% of the total mass percentage: 10% to 35% of pretreated pyrite tailing powder, 30% to 50% of granulated blast furnace slag powder, 15% to 30% of steel slag powder, and the remainder being gypsum powder. The invention heats the pyrite tailing at 300°C and ultrafinely grinds the pyrite tailing to cause an oxidation reaction of pyrite and pyrrhotite contained therein to generate sulfate minerals, thereby reducing the proportion of sulfide compounds in the tailing and reducing the risk of expansion and cracking of a hardened body of the solid waste-based cementitious material in the later stage. Moreover, the sulfate generated by oxidation and the gypsum contained in the pyrite tailing react with the steel slag and slag in the solid waste-based cementitious material to generate hydrated calcium silicate gel and calcium sulfonite, thereby improving the strength of the solid waste-based cementitious material.

The invention discloses an ettringite / nano hydrated calcium silicate early strength agent as well as a preparation method and application thereof, and belongs to the technical field of concrete admixtures. The early strength agent comprises ettringite and nano calcium silicate hydrate, the ettringite is in a short rod shape and has three sizes, and the size distribution and the percentage of the ettringite accounting for the total mass of the ettringite are as follows: the diameter of the ettringite is 40-50nm, and the percentage of the ettringite is 40-80%; the diameter is 70-90 nm, and the proportion is 10-30%; the diameter is 120-150nm, and the proportion is 10%-30%. The ettringite with a proper size is compounded according to a specific proportion and then is combined with the nano hydrated calcium silicate to form the composite seed crystal, and the composite seed crystal is used as the early strength agent, so that the mechanical property of silicate cement can be remarkably improved.

The invention relates to a building material, and particularly discloses a high-ductility cement-based composite material and a preparation method thereof.The cement-based composite material is prepared from, by weight, cement, water, an additive, PE fibers, modified PVA fibers, sand, hollow glass beads, silica fume, calcium silicate and expanded perlite; wherein the modified PVA fiber is prepared by compounding and modifying polyimide aerogel with acrylate resin and epoxy resin; the preparation method comprises the following steps: mixing the cement, the silica fume, the sand, the calcium silicate and the expanded perlite, and then adding the PE fibers to prepare a dry-mixed mixture; and mixing an additive with water to obtain a mixture, then adding the modified PVA fibers, uniformly stirring, then adding the dry-stirred mixture, and uniformly stirring to obtain the high-ductility cement-based composite material. According to the present invention, the fly ash is not added, such that the product quality stability is ensured, the good mechanical property and the good ductility are provided, and the energy saving and thermal insulation functions are provided.

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

The invention discloses a production method for preparing a potassium humate fertilizer through continuous high-pressure hydrothermal reaction of potassium feldspar, and relates to a wet grinding pulping process, a hydrothermal reaction process, a flash evaporation filter pressing process, a humic acid modified potassium fertilizer preparation process and a causticization and humic acid modified silicon-calcium fertilizer preparation process. The preparation method comprises the following steps: firstly, carrying out high-pressure tubular hydrothermal reaction and tower-type delayed reaction on potassium feldspar alkaline ore pulp prepared by fine grinding to prepare potassium aluminosilicate and calcium silicate, mixing alkaline potassium aluminosilicate filter residues obtained by filtering with humic acid, modifying, granulating and drying to obtain a humic acid coated long-acting slow-release potassium fertilizer product. The alkaline calcium silicate filtrate and lime are subjected to a causticization reaction to obtain a KOH solution, the KOH solution is returned to a wet pulping process to be recycled, and the alkaline calcium silicate and the humic acid are mixed, modified, granulated and dried to produce the humic acid coated long-acting slow-release silicon-calcium fertilizer product.

The invention discloses a composite gas hole sealing material and a preparation method thereof. The composite gas hole sealing material is prepared from the following raw materials in parts by weight: 35-50 parts of Portland cement, 50-65 parts of a solid waste-based cementing material, 1-5 parts of an active exciting agent, 1-5 parts of an early strength agent, 3-5 parts of a microcapsule expanding agent, 0.2-0.4 part of a water reducing agent and 1-3 parts of an accelerator. According to the composite gas hole sealing material disclosed by the invention, the dissolution and hydration of the solid waste-based cementing material are accelerated through the active exciting agent, and the generation of a hydration product is promoted through early-strength excitation including the synergistic effect of alkylol amine and nano-spray calcium silicate, so that the early strength of the composite gas hole sealing material is greatly improved; expansion components released after the composite gas hole sealing material is extruded and fractured by a drilled hole react with hydration products to generate ettringite to compensate shrinkage and improve the sealing performance, and the performance of the composite gas hole sealing material is further optimized under the assistance of a proper amount of a water reducing agent and a proper amount of an accelerator. The composite gas hole sealing material is simple in preparation process and low in production cost.

The invention relates to a novel fertilizer containing seaweed oligosaccharide and application of the novel fertilizer in acidified cultivated land, and relates to the technical field of fertilizer.The novel fertilizer containing seaweed oligosaccharide comprises, by weight, 8-12 parts of seaweed oligosaccharide; 30-40 parts of lignite humic acid; 20-30 parts of a nitrogen-phosphorus-potassium compound fertilizer; and 10-12 parts of calcium silicate. The novel fertilizer is applied to acidified cultivated land and is also applied to promotion of plant root growth and improvement of plant acid resistance and immunocompetence. The fertilizer not only has the effect of improving acidified soil, but also is beneficial to the root growth of plants and improves the immunocompetence and acid resistance.

The invention relates to the technical field of cement-based pavement patching materials, and particularly discloses an aluminoferrite cement-based concrete pavement patching material as well as a preparation method and application thereof. The repairing material is prepared from the following raw material components in parts by weight: 25 to 45 parts of iron aluminate cement clinker, 2 to 5 parts of Portland cement clinker, 5 to 15 parts of composite gypsum, 2 to 4 parts of calcium sulphosilicate, 2 to 4 parts of vaterite, 10 to 25 parts of mineral powder, 40 to 50 parts of fine aggregate, 0.05 to 0.25 part of triisopropanolamine or diethanolisopropanolamine, 0.75 to 1.5 parts of calcium formate and 0.5 to 1.0 part of sulfate. The strength of the repairing material can be improved in the whole age, the freeze-thaw resistance is improved, and the repairing material has good bonding strength with the pavement.

The invention discloses an early-strength high-fluidity cement-based grouting material and a preparation method thereof, and belongs to the technical field of grouting materials. The grouting material is prepared from the following raw materials in percentage by mass: 40-50% of cement, 3-5% of an early strength agent, 0.5-1.5% of a water reducing agent, 3-20% of a mineral admixture, 0.2-1% of a defoaming agent and 35-50% of aggregate, the early strength agent is a composition of a ground nano seed crystal early strength agent based on hydrated calcium silicate and lithium sulfate, and the water reducing agent is an asparaginic acid ester modified polycarboxylic acid water reducing agent. According to the invention, high fluidity and high stability of the cement-based grouting material are realized, the problem of insufficient early strength of the traditional grouting material is solved, and sufficient grouting in a complex and narrow construction environment can be met.

The invention provides a slag filling material and application thereof, and belongs to the technical field of slag filling materials. The slag filling material provided by the invention comprises the following raw materials: tailings, slag, water and an alkali activator, the alkali activator comprises sodium carbonate and calcium hydroxide or carbide slag. According to the invention, sodium carbonate and calcium hydroxide or carbide slag are used as the composite alkali activator, on one hand, the calcium hydroxide or carbide slag is added to reduce the concentration of slag and tailings, and water is consumed in the reaction process, so that the water-cement ratio of the filling material is reduced, and the mechanical properties of the filling material are improved; on the other hand, the concentration of calcium ions in a reaction system is increased by adding the calcium hydroxide or the carbide slag, so that the Ca / Si ratio of the hydrated calcium silicate gel is increased, the mechanical property of the filling material is improved, meanwhile, the porosity of the filling material is reduced by calcium carbonate formed by the reaction, and the mechanical property of the filling material is further improved.

A method of generating a cementitious powder comprising the steps of: - providing waste powder obtained from comminuting autoclave-cured waste material, which autoclave-cured waste material comprises a calcium silicate matrix, and - carbonating said waste powder.

The invention belongs to the technical field of mine filling materials, and discloses a solid-waste-based mine filling material and a preparation method thereof. The filling material comprises 70-100 parts of red mud, 1-10 parts of fly ash, 1-10 parts of slag, 5-20 parts of an acid activator, 10-30 parts of aggregate, 1-5 parts of a water reducing agent and 50-100 parts of water. The doping amount of the red mud of the filling material can reach 60% or above, the red mud is used as a main cementing material, formic acid, acetic acid, oxalic acid and other small-molecular organic acids are used as an acid activator, and an acid environment provided by the acid activator can reduce the alkalinity of the red mud and promote the dissolution of the red mud; the water and calcium silicate in the red mud can be more easily subjected to hydration reaction to generate a large amount of hydration products such as C-S-H gel, so that the strength of the filling material is enhanced. The acid activator used in the invention is low in cost, the cementing material and the aggregate are industrial solid wastes, and the cost of the mine filling material is reduced while the problem of resource utilization of the industrial solid wastes is solved.

The invention belongs to the technical field of grouting materials, and particularly relates to a graphene modified ternary composite ultrafast curing grouting material and a preparation method thereof. The technical scheme is as follows: the graphene modified ternary composite ultrafast curing grouting material comprises the following components: a main agent and a curing agent in a weight ratio of 4: 1, wherein the main agent is prepared from the following components in parts by weight: 30 to 33 parts of modified nano calcium silicate, 0.8 to 0.9 part of functionalized graphene, 3.8 to 4.2 parts of intelligent response type expansion factors, 2.5 to 3.0 parts of nanoscale molecular sieves and 18 to 20 parts of surface modified composite mineral admixtures; the main agent is prepared by adopting a special dispersion medium; the curing agent is prepared from the following components in parts by weight: 1.5 to 1.8 parts of amino-functionalized carbon nanotubes, 9 to 10 parts of an active site initiator, 4.5 to 5.0 parts of an interface coupling agent composite system and 2.5 to 2.8 parts of an intelligent regulation and control aid; the curing agent is prepared by a special carrier. The invention provides a graphene modified ternary composite ultrafast curing grouting material and a preparation method thereof.

The invention provides a synthetic method of methyl p-tert-butylbenzoate, and belongs to the technical field of chemical synthesis, the synthetic method comprises the following steps: mixing sulfonic acid resin in a molten state with calcium salt of nano powder, then rapidly solidifying to prepare mixed particles, and then sequentially carrying out pickling activation, cleaning and drying to prepare a modified sulfonic acid resin catalyst; the calcium salt is at least one of calcium sulfate and calcium silicate; the method comprises the following steps: adding p-tert-butylbenzoic acid and absolute methanol into reaction equipment, carrying out a step-by-step esterification reaction of heating and cooling at 90-150 DEG C under the catalysis of a modified sulfonic acid resin catalyst, and carrying out post-treatment after the reaction is finished, so as to obtain methyl p-tert-butylbenzoate, wherein the molar ratio of p-tert-butylbenzoic acid to absolute methanol is (1: 3)-(1: 5). According to the method, the modified sulfonic acid resin is used as the catalyst, and the stepped esterification reaction of heating and cooling is combined, so that the methyl p-tert-butylbenzoate with the purity being greater than or equal to 99.99% is prepared, and the conversion rate of p-tert-butylbenzoic acid exceeds 99%.

The invention relates to the technical field of concrete admixtures, and discloses a nano rebound inhibitor for shotcrete and a preparation method thereof. The components, measured by weight, include 400-600 parts of nano microspheres, 400-550 parts of nano calcium carbonate, 10-30 parts of sodium carbonate, 1-10 parts of sodium aluminate, 10-30 parts of alum, 18-40 parts of polycarboxylic acid water reducer, and 0-0.5 parts of triterpenoid saponin; the nano microspheres are hydrated calcium silicate with silicon dioxide as the core material and colloid as the shell material, and the colloid is doped with a lithium source. The nano rebound inhibitor of the present application can significantly improve the state of shotcrete and greatly reduce the rebound amount of concrete, thereby further saving construction costs and accelerating construction accuracy. By utilizing the characteristics of the mineral admixture in the nano rebound inhibitor, the compactness of the concrete can be improved, and the durability of the shotcrete can be further improved.

The invention provides a preparation method of a quick-freeze-drying low-cost calcium silicate aerogel, which takes cheap inorganic calcium salt and inorganic silicon source as raw materials, and provides a preparation method of the calcium silicate aerogel, which comprises the following steps: forming calcium-silicon hydrolysate, introducing a coagulant, gelling and freezing, freeze-drying, carrying out heat treatment and the like, thereby obtaining the quick-freeze-drying low-cost calcium silicate aerogel. The calcium silicate aerogel material with three-dimensional nanopores, low density, temperature resistance, fire prevention and excellent thermal stability is prepared. The temperature-resistant and fireproof calcium silicate aerogel is prepared by taking low-cost inorganic calcium and an inorganic silicon source as raw material parts through quick freeze drying, and has important significance on industrial cost reduction and efficiency improvement.

The invention belongs to the technical field of ETFE film preparation, and particularly relates to a preparation method of a high-strength ETFE film. The preparation method of the ETFE film comprises the following steps: preparing a mixture of modified nano cellulose and calcium magnesium silicate whiskers; carrying out modification treatment on the poly (p-benzamide) fiber; and preparing the ETFE film. According to the preparation method of the high-strength ETFE film, the perfluoroalkoxy copolymer and the ETFE resin are selected and mixed for use, during melt extrusion, the perfluoroalkoxy copolymer can lubricate the ETFE and reduce the overall melt viscosity, the critical shear rate of the perfluoroalkoxy copolymer is higher than that of the ETFE, melt fracture can be inhibited, the film is evenly extruded, the flatness of the film surface is improved, and the high-strength ETFE film is prepared. And meanwhile, the elastic retraction of the ETFE is inhibited during high-temperature setting. And the modified nano cellulose and calcium magnesium silicate whisker mixture and the modified poly-p-benzamide fiber are added to enhance the mechanical strength of the prepared ETFE film.

The invention provides a method for deeply extracting vanadium from vanadium-containing steel slag, which comprises the following steps: mixing the vanadium-containing steel slag and an oxygen-containing microbubble ammonium bicarbonate solution, and carrying out mechanochemical ball milling activation to carry out leaching reaction to obtain a vanadium extracting solution. According to the method, advanced oxidation is cooperated with mechanochemical ball milling to activate and strengthen deep extraction of vanadium in the vanadium-containing steel slag, wrapping of substances such as calcium silicate and calcium titanium oxide on a vanadium-containing solid solution phase is destroyed through mechanical activation, and O2 microbubbles in an ammonium bicarbonate medium are promoted to generate active oxygen under excitation of mechanical activation energy; exposure reaction and deep oxidation extraction of a vanadium-containing phase under mild conditions are achieved, the content of V2O5 in tailings after vanadium extraction is smaller than or equal to 0.5%, and the vanadium extraction rate is 83% or above.

The invention relates to the technical field of mortar, in particular to waterproof and acid-resistant mortar for municipal pipeline repair. 1000 parts by weight of the mortar comprise the following raw materials in parts by weight: 250-500 parts of a cementing material, 20-60 parts of an admixture, 1-5 parts of a water reducing agent, 30-100 parts of quartz powder, 10-40 parts of latex powder, 1-5 parts of a water repellent, 1-5 parts of fibers, 0.1-1 part of cellulose ether, 1-15 parts of a magnesium additive, 0.1-0.8 part of an early strength agent, 1-5 parts of a defoaming agent, 2-8 parts of a thixotropic lubricant, 0.5-3 parts of a retarder and the balance of aggregate. According to the invention, two cementing materials of a mixture of aluminate cement and sulfate-resistant portland cement are adopted, an admixture is doped, hydrophobic additives of a water reducing agent and latex powder are added, aggregate and the like are matched, and magnesium additives such as magnesium oxide and magnesium hydroxide are added, so that weak acid in sewage can be consumed through reaction, and calcium silicate crystals in the mortar are prevented from being corroded by the weak acid at the same time; acid etching resistance protection is formed; the device can be used for plane and vertical face maintenance in municipal sewage pipeline maintenance, and is good in construction state and excellent in performance.

The invention provides a preparation method and application of a nano calcium silicate nucleating agent, and relates to the technical field of nano material preparation, the preparation method comprises the following steps: conveying a calcium salt solution, a silicate solution and a dispersant solution into a microfluidic reactor for reaction to obtain the nano calcium silicate nucleating agent; wherein the retention time of the reaction in a microchannel of the microfluidic reactor is 1 to 10 minutes; and the inner diameter of the microchannel is 20-500 [mu] m. The invention solves the technical problems of slow mass and heat transfer, long reaction time and need of exploration and amplification of the process in the traditional kettle type or magnetic stirring process for preparing nano calcium silicate, and achieves the technical effects of fast mass and heat transfer, high production efficiency, easy industrialization amplification and shortening of the industrialization research and development period. The obtained nano calcium silicate nucleating agent is beneficial to improving the early strength performance of cement, and has no influence on the later strength of the cement.

The invention relates to the technical field of building materials, and particularly discloses a bridge expansion joint cement-based repairing mortar material and a preparation process thereof. The invention discloses a cement-based repair mortar material for bridge expansion joints. The cement-based repair mortar material is prepared from the following raw materials in parts by weight: 20-30 parts of Portland cement, 1-5 parts of benzoxazine resin, 30-40 parts of sandstone, 0.5-2 parts of nano silicon dioxide, 0.5-2 parts of a water reducing agent, 1-3 parts of hydrated calcium silicate, 15-25 parts of water and 10-15 parts of modified polyurethane, the preparation method comprises the following steps: dispersing the nano silicon dioxide in water, carrying out ultrasonic treatment, uniformly stirring to form a stable suspension, respectively adding the hydrated calcium silicate and the modified polyurethane, uniformly stirring, sequentially adding the Portland cement, the benzoxazine resin and the gravel, and stirring and mixing until the slurry is uniform to obtain the repair mortar material. The composition can be used for repairing bridge expansion joints, and has the advantages of good durability, high compressive strength and the like.

The invention belongs to the technical field of calcium silicate board production, and particularly relates to a plate-making forming device for improving the quality of a calcium silicate board blank, which comprises a rack, and a headbox, a felt belt, a breast roll, a forming roll and a cleaning box are mounted on the rack; a passing opening is formed in the cleaning box, the felt belt penetrates through the cleaning box from the passing opening, a guide roller is installed in the cleaning box, and the felt belt is in a U shape in the cleaning box; a water spraying plate is mounted in the cleaning box, and the felt belt is immersed below the liquid level in the cleaning box; a cleaning roller is installed in the cleaning box and makes contact with the lower surface of the felt belt, and the rotating direction of the cleaning roller is opposite to the moving direction of the felt belt. The cleaning device is simple in structure, the felt belt can be cleaned in an immersed mode in the cleaning box, the cleaning box is divided into a plurality of cleaning grids, the cleaning effect of the felt belt is improved, and slurry after cleaning is prevented from being attached to the felt belt again.

The invention belongs to the field of quality safety of agricultural products, and particularly relates to a soil conditioner as well as a preparation method and application thereof. The soil conditioner provided by the invention is prepared from slaked lime, calcium hydrogen phosphate, potassium nitrate, urea, calcium silicate, zinc sodium ethylene diamine tetraacetate and sodium selenite. The conditioner formed by reasonably matching different fertilizers is small in application amount, under the synergistic effect of the fertilizers, the content of heavy metal in agricultural products can be remarkably reduced, meanwhile, the selenium content and yield in the agricultural products can be remarkably increased, and the conditioner is suitable for various crop varieties.

The invention discloses a novel sewage softening and silicon removal synchronous method and system. The method comprises the following steps: detecting the concentration of calcium ions and the concentration of silicon dioxide in wastewater; adjusting the pH value of the wastewater; adjusting the temperature of the wastewater; adding a sodium hydroxide agent into the wastewater and stirring; and carrying out solid-liquid separation to obtain treated wastewater. According to the method, a chemical precipitation method is adopted, a sodium hydroxide agent is added into the high-calcium and high-silicon-dioxide wastewater, and a calcium silicate precipitate is generated through a chemical reaction, so that the aim of removing calcium ions and silicon dioxide is synchronously achieved, and the dual effects of sewage softening and silicon removal are achieved.

The utility model relates to the technical field of indoor overhead ground construction, in particular to an overhead ground structure suitable for a large-specification ceramic tile surface layer, which comprises a building floor slab, a supporting structure arranged above the building floor slab and a ground structure arranged above the supporting structure, the foundation bolt comprises an elastic rubber base, a supporting screw rod and a bearing and supporting nut which are sequentially connected, the supporting screw rod comprises a screw rod base plate and a screw rod structure, and a screw rod drainage hole is formed in the screw rod structure in the length direction in a penetrating mode; the ground structure comprises a first calcium silicate board, a high-strength extruded sheet, a second calcium silicate board and ceramic tiles which are sequentially and upwards laid above the supporting structure, a threaded hole groove is formed in the bottom face of the first calcium silicate board, a bearing supporting nut is in threaded connection with the bottom face of the first calcium silicate board, and a bearing disc of the bearing supporting nut abuts against the bottom face of the first calcium silicate board. Installation is convenient and reliable.