25results about How to "Reduce stockpiles" patented technology

The invention discloses a three-in-one drilling fluidized filling green mining method for a fully mechanized coal mining face. Comprising the following steps that a ground filling pump station is arranged on the ground, a filling chamber is arranged underground, and a ground filling system is responsible for filling work of a separation layer area and conveying filling materials to the underground filling chamber; and an underground filling system needs to fill the fissure zone and the caving zone. The method comprises the following steps: firstly, determining the layer position of separation grouting, the arrangement of separation drill holes, the separation grouting amount and other key conditions for implementing separation grouting filling mining according to factors such as separation occurrence time, separation space and separation development conditions; for a fissure zone and a caving zone, the height and filling amount parameters of the caving zone need to be determined. And finally, the filling system is designed, and the matching relation of the underground filling system in time and space is mainly considered. And the three-in-one filling can support the overlying strata, so that the safety of underground workers is protected, and the ground building is protected from being damaged.

The invention discloses lightweight aggregate based on ardealite and multi-source solid waste as well as a preparation method and a utilization method of the lightweight aggregate, and aims to solve the problems of low utilization rate of the ardealite and the multi-source solid waste, high energy consumption and high carbon emission of a utilization scheme, insufficient long-term water stability of a recycled product and the like in the prior art. The phosphogypsum and the multi-source solid waste are gelatinized by using the alkali activator, so that the solid waste generates viscosity to form a polymerized gel material, and the gelatinization process is realized by using the activity of the industrial solid waste, so that the lightweight aggregate with high strength and good performance is obtained. And meanwhile, the lightweight aggregate is classified in a cascade manner according to different strength grades of the lightweight aggregate, so that the practicability of the recycled product is improved.

The invention relates to the technical field of aluminum-containing solid waste treatment, in particular to energy-saving low-carbon cement prepared from alkali-activated aluminum-containing solid waste and a preparation method of the energy-saving low-carbon cement. The energy-saving and low-carbon cement is prepared by selecting an exciting agent under a specific modulus and matching the exciting agent with a specific thermal activation treatment condition for thermal activation treatment of the red mud, so that the 28d activity index of the cement and the low-carbon cement reaches 95% or above, the quality of the energy-saving and low-carbon cement is guaranteed, and meanwhile, the situation that carbon dioxide is discharged due to calcination of limestone is avoided, and the energy consumption is reduced. The consumption of coal resources is reduced through low-temperature calcination, and the preparation cost of the cement is reduced.

The invention discloses high-phosphorus and high-sulfur free-cutting steel and a production method thereof. The high-phosphorus and high-sulfur free-cutting steel comprises the following chemical components: 0.51 to 0.56 percent of C, 0.06 to 0.13 percent of Si, 0.80 to 1.0 percent of Mn, 0.041 to 0.065 percent of P, 0.08 to 0.10 percent of S, less than or equal to 0.010 percent of Als, 0.0015 to 0.0030 percent of Ca, 0.16 to 0.22 percent of Mo, 1.90 to 1.98 percent of Cr and 8 to 12 percent of Mn / S. Before converter blowing, high-phosphorus slag and drossing iron are added into a converter, then molten iron is added, phosphorus and sulfur in molten steel at the end point of the converter meet the requirements of a finished product, and the temperature of the molten steel at the end point is 1630-1660 DEG C; the low-alkalinity slag is manufactured through LF refining, the alkalinity is controlled to be 1.0-1.2, and component control and the manganese-sulfur ratio are stable; and the temperature of LF carried-out molten steel is 1530-1540 DEG C. According to the method, ferrous sulfide and ferrophosphorus alloy are not added behind the converter, the sulfur content fluctuation caused by unstable sulfur yield in the refining process is avoided, the manganese-sulfur ratio fluctuation is reduced, cracks are eliminated, the quality of the continuous casting billet is improved, and the production cost is reduced. Meanwhile, the effective utilization of waste resources is realized.

The invention relates to a wing connection device for connecting an outer wing to a central wing and comprising a triple joint comprising a first joint, a second joint and a third joint, wherein the first joint is fixed to a central wing rear spar of the central wing, the second joint is fixed to an outer wing rear spar of the outer wing and the third joint is fixed to a docking rib web of the outer wing, and a rear strut plate fixed to a rear spar frame of the central wing. In this way, by fixing the rear strut plate to the rear spar frame of the central wing, the load from the outer wing can be spread, so that the stress level is reduced, the structural efficiency is improved and the deformation of the connection structure is reduced. For example, the rear strut plate spreads the upward load and spreads the load to the fuselage frame and via the fuselage frame to the fuselage. The invention also relates to an aircraft comprising such a wing connection device and to a method of connecting wings.

The utility model discloses an industrial waste residue composite cementing material preparation system which comprises a first calcining furnace, a kaolin feeding hole and a bauxite feeding hole are formed in the first calcining furnace, the first calcining furnace is connected with a first mixing kettle, and a coal ash feeding hole and a 10% sodium hydroxide solution feeding hole are formed in the first mixing kettle; the outlet end of the second calcining furnace is connected with the inlet end of the dehydrating tower, the outlet end of the dehydrating tower is connected with the inlet end of the second calcining furnace, the second calcining furnace is provided with a sodium dihydrogen phosphate feed port and a urea feed port, and the second calcining furnace is connected with the second mixing kettle; the second mixing kettle is provided with a red mud feeding hole, a coal gangue feeding hole, a metallurgical slag feeding hole and a glass water feeding hole; and the second mixing kettle is sequentially connected with the air furnace, the grinding kettle and the finished product bin. According to the utility model, the stockpiling of industrial solid wastes can be reduced, the environmental pollution can be effectively reduced, and the problem of infrastructure material shortage can be effectively relieved on the premise of ensuring the engineering quality.

The invention discloses a lightweight aggregate fiber reinforced precast concrete material doped with gold tailing sand and a preparation method. The concrete material is prepared from the following components in parts by weight: 200 to 300 parts of cement, 100 to 150 parts of fly ash, 150 to 200 parts of gold tailing sand, 75 to 100 parts of waste glass powder, 75 to 100 parts of steel slag, 1 to 4 parts of template agent, 5 to 10 parts of fiber, 10 to 15 parts of additive and 100 to 150 parts of water, wherein the template agent is put into water to prepare a template agent solution, the gold tailing sand, the waste glass powder and the steel slag are mixed and added into the template agent solution, the mixture is rolled in a granulator to prepare lightweight aggregate pellets, and the lightweight aggregate pellets are carbonized for use. The special lightweight aggregate and proportion are adopted, so that the concrete has the characteristics of the lightweight aggregate, is convenient to construct and transport, can be applied to building projects with strict requirements on the self weight of the structure, and reduces the production cost of the concrete to a certain extent by using wastes as part of raw materials.

The invention relates to a grass planting brick based on an ardealite-based composite cementing material and a preparation method thereof.The grass planting brick is prepared from, by mass, 100 parts of the ardealite-based composite cementing material, 0.05-0.3 part of a retarder, 0-0.5 part of a waterproof agent, 0-70 parts of aggregate and 40-70 parts of water, and the ardealite-based composite cementing material is prepared from 70-90 parts of modified ardealite powder, 10-30 parts of blast furnace slag powder and 0-3.5 parts of an alkaline activator; the modified ardealite powder is obtained by calcining and ball-milling ardealite powder. According to the invention, the stockpiling amount of the phosphogypsum can be effectively reduced, the utilization rate of the phosphogypsum is improved, and the modified phosphogypsum powder is calcined and ball-milled, so that leaching of heavy metals and harmful chemical substances can be effectively avoided, and the influence of soluble phosphorus and fluorine is reduced; the preparation method is simple and low in cost, the utilization rate of the ardealite raw material can be increased, and the obtained grass planting brick can meet related standard requirements.

This invention discloses a method for the comprehensive utilization of sulfide tailings, relating to the field of sulfide tailings treatment technology. This method uses lead-zinc tailings as raw material and innovatively employs a combined "two-stage acid leaching-gravity separation-flotation" process. First, two stages of acid leaching selectively leach calcite associated with barite in the tailings, reducing the influence of muddy calcite while activating pyrite. Subsequently, the acid leaching residue undergoes gravity separation to further separate undissolved calcite, quartz, and other silica-containing gangue minerals. The gravity concentrate is then subjected to flotation to achieve the separation of barite and pyrite, ultimately obtaining high-purity barite and pyrite products respectively. This invention features a reasonable process route and simple operation, effectively solving the separation problem of fine-grained, high-viscosity lead-zinc tailings, achieving full-component purification and utilization of lead-zinc tailings, significantly enhancing the economic value of tailings resources, and reducing the environmental pressure caused by tailings stockpiling, thus demonstrating good economic, environmental, and social benefits.

The invention discloses a method for purifying and whitening phosphogypsum, which belongs to the technical field of comprehensive utilization of solid waste. The method for purifying and whitening phosphogypsum comprises the following steps: (1) adding water to phosphogypsum to prepare ore pulp, decolorizing the ore pulp to obtain decolorized ore pulp; (2) adding a collector to the decolorized ore pulp, adding a pH regulator, adjusting the pH to 2.0-2.5, performing a first positive flotation, and obtaining a first flotation liquid; (3) adding the pH regulator to the first flotation liquid, adjusting the pH to 2.0-2.5, performing a second positive flotation, and obtaining a second flotation liquid; (4) adding the pH regulator to the second flotation liquid, adjusting the pH to 2.0-2.5, performing a third positive flotation, concentrating, filtering, and drying to obtain refined phosphogypsum. The method can prepare phosphogypsum with high purity and high whiteness, effectively reduce the storage of phosphogypsum, and relieve environmental pressure.

This invention relates to the field of iron ore beneficiation technology and discloses a method for preparing efficient roasting and separation of refractory iron ore, comprising the following steps: S1, raw material pretreatment and pre-enrichment: refractory weakly magnetic iron oxide ore is crushed, and a dry separation method is used to pre-remove some low-grade waste rock to obtain pre-enriched rough concentrate; S2, intelligent grinding and drying; S3, magnetized roasting; S4, rapid quenching and stabilization of roasted ore. This invention, through rapid cooling (quenching) combined with an atmosphere protection process, stabilizes and solidifies the magnetism of the magnetized roasting product—magnetite—avoiding magnetic loss due to subsequent processing, providing a high-magnetic, stable feed for subsequent weak magnetic separation operations, which is a prerequisite for ensuring a high magnetic separation recovery rate; through strong magnetic separation to ensure recovery rate, combined with intelligent flotation to improve concentrate grade, a deep cleaning process is formed, achieving refined separation of complex roasting products, maximizing both the total iron metal recovery rate and concentrate grade simultaneously.

The application discloses a method for preparing arsenic-cadmium alloy by using arsenic-cadmium acid waste liquid, and belongs to the technical field of wastewater treatment. The application realizes the selective precipitation of arsenic and cadmium in the form of Cd5H2(AsO4)4.4H2O with high purity and complete crystal form by precisely controlling the molar ratio of cadmium to arsenic in the waste liquid to be 1.2-1.6 and adjusting the pH of the precipitation to be 4-6, thereby realizing the deep removal of the two toxic elements of arsenic and cadmium, and the removal rate of arsenic can reach more than 96.70%, and the process flow is greatly reduced. The Cd5H2(AsO4)4.4H2O-based precipitation slag is converted into high-purity arsenic-cadmium alloy by carbon thermal reduction, the amount of slag is greatly compressed, and the storage and landfill of waste materials are significantly reduced. The alloy can be further used to prepare downstream products such as semiconductor materials as a high-value-added product, realizes the high-value conversion from harmful waste to high-end raw materials, and has remarkable green disposal and resource utilization benefits.

The invention discloses a method for preparing a municipal road lime fly ash base stabilizing material by using a large mixing amount of construction waste recycled aggregate, which comprises the following steps of: crushing the construction waste recycled aggregate to obtain recycled coarse aggregate and recycled fine aggregate according to the particle size specification; determining the mix proportion of the lime, the fly ash and the synthetic regenerated graded aggregate; and preparing the municipal road lime fly ash base material. According to the method, the municipal road base stabilizing material is prepared by completely replacing natural aggregate with the construction waste recycled aggregate, the utilization rate of the construction waste is greatly increased, the engineering material cost is reduced, the mining pressure of natural materials is relieved, and the ecological environment is improved; the material has positive influence and practical value for promoting the rapid development of the construction waste resource utilization industry and improving the construction waste resource utilization rate in China, and meanwhile, the material meets the requirements of related technical specifications, is excellent in performance and has the technical performance for engineering use.

The application discloses a construction method of a maximum packing density model of a tailings and gravel mixed aggregate, and belongs to the technical field of mining. The method determines the change rule of the packing density of the mixed aggregate by analyzing the packing characteristics of the tailings and gravel mixed aggregate in a unit volume and combining the boundary conditions, establishes the packing density models of the tailings and gravel mixed aggregate respectively, classifies and discusses the maximum packing density conditions of the two mixed materials, constructs the maximum packing density model of the tailings and gravel mixed aggregate, and determines the maximum adding proportion of the gravel. The model constructed by the application is scientific and reasonable, can quickly and accurately calculate the packing density of the tailings and gravel under any mixing condition, and simultaneously designs the maximum packing density for mine filling, so that the designed filling body strength is achieved, the cement consumption is greatly reduced, the cost is reduced, and a decision basis is provided for the rational utilization of the tunneling waste rock for mine filling.

The invention provides an SBA-15 molecular sieve loaded defective manganese-based catalyst, the SBA-15 molecular sieve is prepared by using silicon-containing solid waste as a raw material, the phase composition of active components of the defective manganese-based catalyst comprises beta-MnO2, Mn2O3 and Mn5O8, and the molar ratio of Mn < 3 + > to Mn < 4 + > is (8-12): 1. The invention also provides a preparation method and application of the SBA-15 molecular sieve loaded defective manganese-based catalyst. The supported defective manganese-based catalyst provided by the invention has very excellent catalytic activity, does not need to use noble metal as an active component, and has an excellent effect in the aspect of catalytic oxidation of volatile organic compounds such as ethylene. The preparation method provided by the invention is simple and convenient in process, low in cost, high in operability and high in safety, so that the preparation method has good industrial practicability and is suitable for large-scale production and application.

This invention provides a composite cementitious material with high rheological properties, its preparation method, and concrete, comprising an active admixture, 40%–60% ordinary Portland cement, 20%–35% modified marble powder, and 0.8%–2% functional admixtures. The modified marble powder is obtained by surface modification treatment of marble powder with a silane coupling agent and a polycarboxylate superplasticizer, effectively solving the problem of marble powder agglomeration and ensuring uniform dispersion in the cementitious system. This significantly optimizes the rheological properties of the paste, improving fluidity and pumpability. The synergistic effect of cellulose ether and air-entraining agent in the functional admixtures further enhances the material's water retention and anti-segregation stability. The cementitious material prepared by this invention possesses both excellent mechanical properties and durability, and the concrete prepared with it exhibits good workability, dense structure, and reliable long-term performance. Simultaneously, this technology achieves high-value-added resource utilization of marble waste, reduces cement consumption and carbon emissions, and aligns with the direction of green building materials and sustainable development.

The present invention provides a method for preparing carbon composite nano cobalt sulfide by short process of organic clean cobalt slag and its application, which belongs to the field of resource environment and new energy battery materials; it includes two steps of acid leaching to remove zinc and low-temperature roasting in oxygen-free atmosphere, realizing the conversion of 98.8% of Fumei cobalt into carbon composite nano cobalt sulfide, and developing and utilizing it as energy storage battery material with high value. It has the advantages of short process flow, high comprehensive utilization rate of cobalt resources, no generation of nitrogen oxides and sulfur oxides, and comprehensive utilization of by-products. The obtained carbon composite nano cobalt sulfide material and its application in the field of battery materials are due to the nano-scale particle size and ultra-thin carbon layer structure of the obtained carbon composite nano cobalt sulfide, short diffusion path of lithium ions in the material, large migration rate, high contribution rate of pseudocapacitive behavior, and 0.1 A g ‑1 After 100 cycles, the discharge capacity is as high as 1198.2 mAh g ‑1 , which is much higher than the theoretical value.

The invention discloses a pit repairing material as well as a preparation method and application thereof, and belongs to the technical field of environment repairing materials. The mine pit repairing material is prepared from the fresh phosphogypsum, the storage yard phosphogypsum, the phosphorite tailings and the like, the purpose of recycling the phosphogypsum can be achieved, the stockpiling amount of the phosphogypsum can be effectively reduced, and therefore the problems of land waste and environmental pollution occurring in the stockpiling process are avoided. The mine pit repairing material prepared by adopting the preparation method disclosed by the invention is relatively low in pollutant content, and can effectively avoid adverse effects on the environment. The mine pit repairing material prepared by the preparation method has excellent mechanical properties, and can effectively ensure the stability of a repaired mine pit.

The invention discloses a red mud-regenerated micro powder synergistically modified cementing material and a preparation method thereof, and relates to the field of low-carbon cementing materials. The red mud-regenerated micro powder synergistically modified cementing material comprises the following components in parts by weight: 40-60 parts of red mud, 20-40 parts of regenerated micro powder, 3-6 parts of an exciting agent, 1-5 parts of a chelating agent, 10-20 parts of water and 2-4 parts of a water reducing agent, the preparation method of the cementing material comprises the following steps: S1, uniformly mixing a chelating agent and red mud, putting the mixture and water into a ball mill, and carrying out mechanochemical modification to obtain modified red mud slurry; s2, grinding the regenerated micro powder by using a ball mill to obtain finely ground regenerated powder; s3, uniformly mixing the modified red mud, the ground regenerated powder and a water reducing agent, adding an exciting agent, and stirring to obtain the cementing material. The synergistically modified cementing material disclosed by the invention has relatively good mechanical properties and flowability, realizes resource utilization of solid wastes, and is low-carbon and environment-friendly.

The invention discloses a composite adhesive for sintered return mine cold-bonded pellets and application of the composite adhesive. The composite adhesive is prepared from liquid sodium silicate, pre-gelatinized cassava starch and defective glass fibers which are sintered, returned and ground on the basis of the total mass of a ball pressing mixture, the application method comprises the following steps: grading and blending sintered return mine according to the grading index, shearing and grinding the sintered return mine and defective glass fiber in a cylindrical rotary drum by utilizing the characteristics of high hardness and sharp edge of the sintered return mine, then mixing the rest of adhesive and water to prepare a ball pressing mixture, and drying and solidifying for 4 hours by utilizing sintering / ring cooling flue gas after performing compression molding by using a pair of rollers at 30MPa. Through the synergistic effect of sodium silicate, cassava starch and glass fiber, the green pellet drop strength is larger than or equal to 5 times / P, the dry pellet compressive strength is larger than or equal to 2200 N / P, and the alkali metal content is smaller than 0.4%; meanwhile, resource utilization of sintering return mine, defective glass fiber and industrial waste gas is achieved, the method is compatible with existing steel equipment, the cost is controllable, the method is suitable for large-scale industrial production, and green and low-carbon transformation of the steel industry is promoted.

The present invention relates to a method for reducing the permanent hardness of high calcium and magnesium sulfuric acid wastewater, and belongs to the field of environmental protection. The method for reducing the permanent hardness of high calcium and magnesium sulfuric acid wastewater provided by the present invention comprises the following steps: firstly mixing alkaline calcium slag powder with high calcium and magnesium sulfuric acid wastewater to remove magnesium hardness; then adding a hardness remover to stir and remove calcium hardness; finally, the obtained hardness-removed liquid is subjected to a constant temperature water bath distillation method or a regeneration agent addition dehydration method to obtain a treated liquid and a regenerated hardness remover, and the treated liquid is adjusted with a pH regulator to obtain neutral soft water. The present invention utilizes alkaline calcium slag and a hardness remover to treat high-hardness wastewater to obtain a desulfurization agent, a gypsum product and low-hardness wastewater, thereby achieving waste treatment with waste, waste utilization, and resource recycling, and has significant economic benefits, social benefits and environmental benefits.

The invention relates to the technical field of electrolytic aluminum solid waste resource utilization, in particular to a method for preparing aluminum fluoride from electrolyte lithium extraction tailings. The invention provides a method for synergistically recovering aluminum and fluorine resources in tailings generated after lithium extraction of an electrolytic aluminum lithium-rich electrolyte. The method comprises the following steps: firstly, leaching the lithium extraction tailings by adopting a hydrochloric acid-aluminum chloride system, so that aluminum and fluorine enter a solution in the form of a fluorine-aluminum complex to obtain a fluorine-aluminum solution; secondly, impurity removal treatment is conducted on the fluorine-aluminum solution, impurities such as silicon, iron, phosphorus and calcium are removed by regulating and controlling the pH value and adding a precipitator, and a purified solution is obtained; finally, hydrofluoric acid is supplemented into the purified liquid, and the anhydrous aluminum fluoride product with the high additional value is prepared through concentration, crystallization and calcination. The method is reasonable in process, efficient resource utilization of complex fluorine-containing and aluminum-containing solid waste is achieved, the aluminum and fluorine recovery rate is high, the product purity is high, and a new technical approach is provided for solving the electrolytic aluminum solid waste treatment problem and constructing a circular economy industrial chain.

The present invention discloses a phosphogypsum-based recycled aggregate and a preparation method and application thereof, and belongs to the technical field of road construction materials. The phosphogypsum-based recycled aggregate, per 100 parts by weight of raw materials, includes the following components: 49.64-60.28 parts of calcined phosphogypsum, 7.09-14.23 parts of slag, 3.55-10.67 parts of Portland cement, 0.36-0.71 parts of sodium hydroxide, and 28.37-28.47 parts of water. The present invention effectively utilizes the synergistic effect between the components through the compounding of multiple materials, has a small number of raw material types, a large proportion of phosphogypsum, and a simple and efficient molding process. The prepared phosphogypsum-based recycled aggregate only requires natural conditions for maintenance and has a short maintenance period. 、 It has high strength and can be widely used in road construction. It has significant economic, environmental and comprehensive performance.

This invention discloses a discrete element method for simulating the micromechanics of concrete using coal gangue as an alternative aggregate, belonging to the field of geotechnical engineering and discrete element numerical simulation technology. The method includes: generating an initial set of spherical particles and constructing a homogeneous equilibrium sample; applying prestress through servo feedback to achieve equilibrium; importing a real crushed stone STL model to generate an irregular Clump template, proportionally replacing the spheres in situ with coal gangue and natural aggregate Clumps; employing a parallel bonding model and assigning differentiated mechanical parameters, then randomly reducing the strength of some contact bonds proportionally to simulate micro-defects; performing uniaxial compression loading, simultaneously monitoring the stress-strain curve, and tracking microcrack evolution based on DFN. This invention significantly improves the accuracy of the simulation through irregular aggregate reconstruction, differentiated parameter assignment of multi-material components, and a random weak contact algorithm, realistically reproducing the mechanical response and failure mode of permeable concrete made from coal gangue, providing a reliable numerical tool for the resource utilization of solid waste.