630results about How to "Raise the grade" patented technology

The invention discloses a method for recovering iron and titanium in vanadium titano-magnetite, and relates to the technical field of vanadium titano-magnetite beneficiation. Raw ore is crushed, and then is subjected to roller milling and screening to obtain oversize and undersize products; undersize products are subjected to weak magnetic pre-selection, tailings obtained after weak magnetic pre-selection and strong magnetic pre-selection are subjected to strong magnetic pre-selection, concentrate obtained after weak magnetic pre-selection and strong magnetic pre-selection are sequentially subjected to first-stage grinding, first-stage weak magnetic separation, second-stage grinding, second-stage weak magnetic separation and second-stage weak magnetic concentration, final iron ore concentrate is obtained, the obtained tailings are combined into iron separation tailings, then the iron separation tailings are subjected to titanium separation grinding, medium magnetic iron removal and strong magnetic roughing, and iron separation tailings are obtained. And tailings obtained after strong magnetic roughing are subjected to strong magnetic scavenging, concentrates obtained after strong magnetic roughing and strong magnetic scavenging are subjected to gravity roughing and gravity concentration, and final titanium concentrates are obtained. By adopting conventional crushing, high-pressure roller grinding, magnetic separation, pre-selection and tailing discarding, the subsequent ore grinding and selecting cost can be effectively reduced, the iron and titanium grades of the ore entering the grinding process are improved, high efficiency and energy conservation are achieved, and the ore dressing efficiency is improved.

The invention discloses a lead-tin separation method in a tin soot wet recovery process, which is used for lead-tin separation in slag charge after zinc and copper recovery of tin soot, and comprises the following steps: lead immersion: adding tin-lead mixed slag charge into prepared saturated chlorine-containing salt water to dissolve lead in the chlorine-containing salt water to obtain lead chloride salt water and tin sludge, thereby realizing lead-tin separation; the obtained tin mud is sold as a product; and lead removal: slaked lime is added into lead chloride saline water, lead slime and chlorine-containing saline water are obtained after the reaction is completed, the chlorine-containing saline water is returned to the lead dipping procedure, and the obtained lead slime can be sold as a byproduct. According to the method, tin and lead are effectively separated from the slag obtained after zinc and copper recovery of the tin soot is completed through a chemical method, the method is simple and easy to operate, the raw material cost is low, the grade of a tin sludge product is improved, meanwhile, a lead by-product is produced, and therefore the economic benefit of tin soot wet recovery is improved; and the whole process of lead-tin separation does not generate waste water, waste residues and waste gas, is environment-friendly and is worthy of popularization and application.

The utility model discloses a high-precision airflow classifier, and relates to the technical field of sorting. The high-precision airflow classifier comprises an airflow classifier shell and a classification device, the classification device comprises a feeding port, the feeding port is fixedly connected to the upper end of the airflow classifier shell and extends into the airflow classifier shell, the upper end of the feeding port is fixedly connected with a driving motor, and the output end of the driving motor is fixedly connected with a rotating shaft; the lower end of the rotating shaft is fixedly connected with a dispersing disc, the surface of the dispersing disc is fixedly connected with baffles, the surface of the dispersing disc is rotationally connected with blades, and resin raw material particles collide with the baffles and the blades through the centrifugal effect of rotation of the dispersing disc, so that the resin raw materials are scattered, and the resin raw materials are evenly distributed in the airflow classifier shell; the uniform distribution ensures that the resin raw materials can be subjected to uniform airflow and centrifugal force, so that the stability and precision of the grading process are improved, and the grading efficiency of the device is improved.

The invention relates to the technical field of pyrolysis gas treatment, in particular to a biomass pyrolysis gas self-heating reforming hydrogen production system which comprises a pyrolysis gas reforming hydrogen production subsystem and a thermochemical self-heating subsystem. Wherein the pyrolysis gas reforming hydrogen production subsystem can realize reforming quality improvement of pyrolysis gas to obtain high-purity hydrogen. On one hand, the thermochemical self-heating subsystem provides energy for the reforming hydrogen production reaction through an exothermic reaction of calcium oxide and carbon dioxide, and continuous and efficient operation of the reforming hydrogen production reaction is achieved; on the other hand, primary separation and quality improvement of the reformed gas can be realized, and the energy of the pyrolysis gas which is difficult to store and transport and has low utilization value is stored in calcium oxide. Through organic coupling of biomass pyrolysis gas reforming hydrogen production and thermochemical heat storage, self-heat-supply upgrading utilization of biomass pyrolysis gas and low-cost preparation of green hydrogen are achieved, and the device has the advantages of being high in energy utilization rate, high in treatment efficiency, convenient to operate and control, high in applicability and the like.

The invention discloses a beneficiation method for efficiently recovering barite from heat treatment drilling waste. The beneficiation method comprises the following steps that (1) the drilling waste containing the barite is subjected to wet screening classification; (2) performing magnetic separation on the undersize product to obtain a magnetic product and a non-magnetic product; (3) carrying out primary roughing and primary concentration on the non-magnetic product to obtain a barite powder product 1; and (4) the roughing tailings are subjected to scavenging for three times, scavenged concentrates are combined and then subjected to fine selection for two times, and a barite powder product 2 is obtained. According to the method, barite in the heat treatment drilling waste is efficiently recycled by adopting a beneficiation method, two different grades of barite powder products are obtained and can serve as drilling fluid raw materials to be recycled, resource utilization of the waste is achieved, and meanwhile environmental hazards are reduced.

The invention provides a beneficiation and enrichment method for high-molybdenum oxide ore, which comprises the following steps of: performing fraction magnetic separation on a product after ore grinding, regrinding magnetic separation coarse particle tailings, mixing the reground product with magnetic separation fine fraction tailings to perform low-potential sulphide ore flotation, performing oxidized ore flotation on sulphide ore flotation tailings, and the like. And finally, the molybdenum concentrate with the high recovery rate and grade is obtained, the molybdenum ore separation and enrichment effect is achieved, and the fine disseminated-particle-size refractory molybdenum oxide ore resources in the high-oxidation-type molybdenum ore are effectively and comprehensively recycled. In order to quickly optimize and obtain the optimal condition of oxidized ore flotation, the flotation inhibitor with the good inhibition effect is determined through the pure ore flotation test, the flotation collecting agent with the high selectivity is selected through the molecular simulation calculation method, and the flotation efficiency and selectivity are improved. The method provided by the invention can be widely applied to the fields of development of high-oxidation molybdenum ore mines and recycling of fine-fraction refractory molybdenum oxide ore resources in tailings after sulfuration flotation.

The invention discloses a pre-concentration and tailing discarding process for vanadium titano-magnetite, and relates to the technical field of vanadium titano-magnetite beneficiation, and the pre-concentration and tailing discarding process comprises the following steps: raw ore is subjected to crushing operation to obtain a crushed product, and the crushed product is fed into high-pressure roller grinding operation to obtain a high-pressure roller grinding product; the high-pressure roller-milled product is subjected to screening operation, and an oversize product with the large particle size and an undersize product with the small particle size are obtained; the undersize products are subjected to first weak magnetic pre-concentration operation, tailings obtained through the first weak magnetic pre-concentration operation are subjected to first strong magnetic pre-concentration operation, concentrate obtained through the first weak magnetic pre-concentration operation and concentrate obtained through the first strong magnetic pre-concentration operation are combined into final pre-concentration concentrate, and the tailings obtained through the first strong magnetic pre-concentration operation serve as one part of final tailings; the oversize products are subjected to second weak magnetic pre-concentration operation, tailings obtained through the second weak magnetic pre-concentration operation are subjected to second strong magnetic pre-concentration operation, and concentrate obtained through the second weak magnetic pre-concentration operation and concentrate obtained through the second strong magnetic pre-concentration operation are combined and then returned to the high-pressure roller grinding operation; tailings obtained by the second strong magnetic pre-separation operation are used as one part of final tailings. According to the method, crushing, high-pressure roller grinding and screening are adopted, oversize and undersize products obtained through screening are subjected to magnetic separation, pre-concentration and tailing discarding, oversize product pre-concentration concentrate is returned to the high-pressure roller grinding, the subsequent ore grinding and selecting cost is effectively reduced, the iron and titanium grades of subsequent ore entering the grinding process are improved, the load capacity of the high-pressure roller grinding machine can be reduced, and energy consumption and production cost are reduced.

The invention provides a flotation separation method for complex and difficult-to-separate high-sulfur copper ore, and belongs to the field of mineral flotation, lime is adopted to adjust ore pulp to a low-alkali environment, and efficient recovery of valuable elements of copper, silver and sulfur is achieved under the combined action of an inhibitor and a synergist. A low-alkali copper separation process is adopted, copper-sulfur intergrowth and silver-containing minerals are prevented from being strongly inhibited in a high-alkali ore pulp environment, regrinding is introduced before copper concentration operation to promote dissociation of the copper-sulfur intergrowth, and the grade of copper concentrate is improved. During copper roughing, gangue minerals and pyrite are inhibited by adopting an inhibitor to prevent the gangue minerals and the pyrite from forming a cover on the surface of metal minerals, and selective inhibition on the pyrite is generated in the forms of strong oxidation, electrostatic adsorption, hydroxylated metal point adsorption and the like on the surface of the pyrite; the synergist is adopted to change the surface charge of gangue minerals, the argillaceous gangue is prevented from forming a mucus coating on the surface of the chalcopyrite by means of electrostatic repulsion, meanwhile, the flotation froth performance is enhanced, floating of the chalcopyrite is accelerated, and the copper separation effect is optimized.

The invention discloses a method for efficiently leaching waste aluminum electrolyte and recovering fluorine, lithium, aluminum and sodium, belongs to the field of solid waste resource recovery, and solves the following problems of low aluminum and lithium leaching rate in an alkaline process and HF pollution in an acid process. The method comprises the following steps: crushing, grinding and screening waste aluminum electrolyte blocks to obtain waste aluminum electrolyte powder A; uniformly mixing the waste aluminum electrolyte powder A with a calcium-containing reaction auxiliary material to obtain a material B; adding the material B into an alkali solution, and carrying out a leaching reaction; separating the materials to obtain filter residues and filtrate; carrying out acid pickling purification and impurity removal on filter residues, and filtering; extracting the filtrate to obtain a loaded organic phase and raffinate; carrying out reverse extraction on the loaded organic phase; adding reaction auxiliary materials into the raffinate, uniformly stirring, reacting, standing, filtering and separating; continuously supplementing reaction auxiliary materials into the filtrate, uniformly stirring, standing, filtering and separating. According to the method, multiple components in the waste aluminum electrolyte can be efficiently recycled, and the comprehensive utilization rate is high.

The invention relates to a high-selectivity flotation method for minerals, belongs to a flotation technology, and aims to solve at least one of the problems of poor mineral collecting effect, poor selectivity, high collecting agent consumption and the like in the conventional flotation method. According to the method, firstly, impurities on the surface of ilmenite raw ore are stripped through first-time microwave pretreatment, meanwhile, part of Fe < 2 + > on the surface of the ilmenite is converted into Fe < 3 + >, and selective adsorption of a flotation reagent on the surface of the ore is better facilitated. The fucoidin is added into the ore pulp for secondary microwave pretreatment, so that the fucoidin in the ore pulp is broken to form an inhibitor with small molecular weight, and meanwhile, the reaction activity of the fucoidin is enhanced by microwave catalysis, so that the process of selectively adsorbing the fucoidin on the surface of gangue is more stable; the effect of improving the inhibition effect can be achieved, and the using amount of the collecting agent can be effectively reduced.

The invention discloses a knowledge graph ontology constrained vegetation remote sensing classification method. The method comprises the steps of data acquisition and data preprocessing, deep learning model selection and fusion of a knowledge graph ontology and a deep learning model. According to the method, the knowledge graph ontology and the FCN8s-ResNet 50 model are fused in the two stages of model training and classification post-processing. The result shows that 1) the classification accuracy of the deep learning model can be remarkably improved by fusing the mountain vegetation knowledge graph ontology in the two stages of deep learning model training and classification post-processing: the accuracy of the deep learning model constrained by the knowledge graph ontology is improved by 10%, and the overall classification accuracy of vegetation types reaches 89.2%; and 2) the deep learning model constrained by the mountain vegetation mapping knowledge domain ontology not only obtains excellent results in fine classification of vegetation types, but also improves the universality and interpretability of the model, so that powerful support is provided for wide-range remote sensing vegetation classification and application of the deep learning model.

The invention provides a copper slag magnetic separation iron extraction method and application thereof.The copper slag magnetic separation iron extraction method comprises the steps that copper slag and a calcium oxide-based additive are mixed to obtain mixed copper slag, the calcium oxide-based additive comprises calcium oxide and / or a calcium oxide raw material, the calcium oxide raw material can generate calcium oxide through heating, and the calcium oxide raw material can generate calcium oxide through heating; the adding amount of the calcium oxide-based additive meets the condition that the total mass of the primary calcium oxide and / or the generated calcium oxide is 29%-47% of the mass of fayalite in the copper slag; the calcium oxide raw material comprises calcium carbonate and / or calcium sulfate; after the mixed copper slag is heated to 1250-1800 DEG C, heat preservation is conducted for 30-120 min, and modified copper slag is obtained; and the modified copper slag is sequentially subjected to slow cooling, crushing and magnetic separation, and iron is obtained. According to the method, the iron element is enriched in a liquid phase, and the recovery rate of iron resources in the copper slag is substantially increased from the source.

The invention discloses a method for disassembling a waste lithium battery. The method comprises the following steps: S1, discharging the waste lithium battery; s2, carrying out voltage testing on the lithium battery subjected to discharging treatment; s3, performing puncture treatment on the lithium battery which is qualified in the voltage test; s4, disassembling the battery subjected to puncture treatment to form a waste material and a battery cell 13; s5, waste materials generated in the disassembling process are subjected to recycling treatment; s6, core pushing treatment is carried out on the disassembled lithium battery, shell pressing recovery treatment is carried out on waste materials such as shells disassembled from the lithium battery, the waste materials are temporarily stored in a shell temporary storage box 20, and disassembled roll cores 13 enter a roll core temporary storage bin 16 to be temporarily stored; and step S7, manually separating positive and negative pole pieces and a diaphragm from the temporarily stored roll core 13. According to the invention, the waste lithium battery can be accurately disassembled to respectively obtain positive and negative pole pieces, diaphragms and shells, and the subsequent treatment process of further sorting positive and negative pole powder and copper and aluminum is simplified.

The invention discloses a collaborative flotation enrichment method for metal lithium gallium and kaolinite in coal gangue, belongs to the technical field of coal series metal enrichment and extraction, and aims to solve the problems of difficulty in physical separation and enrichment and low separation efficiency of coal series metal lithium gallium in the prior art. The method comprises the following steps: roughing coal gangue in advance, and removing part of carbon-containing minerals to obtain a roughed material; ore grinding is conducted on tailings obtained after roughing, and materials obtained after ore grinding are obtained; decarburization flotation is conducted on the ground materials, and decarburization flotation materials are obtained; carrying out pyrite removal flotation on the decarburized and floated material to obtain a pyrite-removed and floated material; and performing quartz removal flotation on the material subjected to pyrite removal flotation. The method can be used for collaborative flotation enrichment of lithium gallium and kaolinite in coal gangue.

The utility model discloses airflow suspension dry type magnetic separation combined equipment which comprises a drum type magnetic separator and a low-pressure pulse bag type collector (14). The drum type magnetic separator comprises a drum (6) located in a separation box body (8), a magnetic system (7) is arranged in the drum (6), a discharging opening of a feeding conical drum (19) penetrates through the upper portion of the separation box body (8) and corresponds to the upper portion of the drum (6), and a magnetic separator air inlet (5) is formed in the side face of the feeding conical drum (19). A tailing discharging port (10) is formed in the lower portion of the separation box body (8) and located on one side of the magnetic system (7), a concentrate discharging port (9) is formed in the lower portion of the separation box body (8) and away from one side of the magnetic system (7), and an air outlet (13) of the magnetic separator is connected with a dust feeding port of a low-pressure pulse bag type collector (14). According to the utility model, high-efficiency separation of fine powdery dry materials is realized under the condition of airflow suspension, the problem of poor dispersity of mineral powder on the surface of the roller is effectively solved, and the problem of dust pollution in the dry separation process of the fine materials is completely eradicated.

The beneficiation method comprises the following steps that (1) after ilmenite is pretreated, the ilmenite is treated through a high-intensity magnetic separation technology, and coarse ilmenite concentrate is obtained; the strong magnetic separation process is carried out by adopting an SHP strong magnetic separation device; and (2) the rough titanium concentrate is subjected to electric separation process treatment, and titanium concentrate is obtained. According to the beneficiation method of the ilmenite, the ilmenite concentrate with the extremely low calcium and magnesium content is obtained, the requirement that the content of CaO and MgO in boiling titanium dioxide chloride raw materials is smaller than or equal to 1.50% is met, the grade of the ilmenite concentrate product can be improved to 48% or above, the recovery rate can reach 90%, the additional value of the beneficiation product and the economic benefit of a production line are improved, and the beneficiation method is suitable for large-scale industrial production.

The invention discloses a beneficiation method of refractory iron ore with symbiotic hematite, limonite and siderite, which comprises the following steps of: crushing weakly magnetic refractory iron ore to below 100mm in a closed circuit, then sequentially carrying out three times of dry screening to obtain four particle fractions of 0-6mm, 6-15mm, 15-40mm and 40-100mm, pre-selecting the particle fractions of 6-15mm by adopting a dry high-intensity magnetic separator, pre-selecting the particle fractions of 15-40mm by adopting a chunk jigger, pre-selecting the particle fractions of 40-100mm by adopting a photoelectric intelligent separator, and pre-selecting the particle fractions of 40-100mm by adopting a high-intensity magnetic separator; photoelectric intelligent pre-selected concentrate is crushed to 0-40 mm through a fine crushing closed circuit, then jigging pre-selected concentrate is combined, then the photoelectric intelligent pre-selected concentrate is crushed to 0-6 mm through an ultra-fine crushing closed circuit, an ultra-fine crushing product is combined with the 0-6 mm fraction, then wet type strong magnetic pre-selection is conducted through a coarse grain wet type strong magnetic separator, the pre-selected concentrate is subjected to ore grinding-fine grain wet type strong magnetic one-coarse one-scavenging one-coarse one-scavenging one-fine one-scavenging reverse flotation, and the final concentrate is obtained. And final concentrate is obtained. The invention has the advantages of large raw ore selection granularity, large tailing discarding amount, low energy consumption, good separation effect and the like.

The invention belongs to the technical field of lithium ion battery materials, and particularly discloses an in-situ doped and coated lithium iron phosphate material as well as a preparation method and application thereof. The lithium iron phosphate material comprises an in-situ carbon coating layer and a lithium iron phosphate core doped with high-valence metal cations in situ, the chemical general formula of the lithium iron phosphate material is LiFe1-xMxPO4 (at) C, x is more than or equal to 0.003 and less than or equal to 0.007, and M comprises at least one of Nb, V, Ti or Y. The lithium iron phosphate material has the advantages of favorable crystallinity, favorable sphericity, uniform distribution of large and small particles, excellent electrochemical properties, high compaction density and low powder resistivity of the material powder, and has high specific discharge capacity and cycle capacity retention ratio when being used as the positive electrode material of the lithium ion battery. The invention also provides a preparation method and application of the lithium iron phosphate material.

The invention relates to the technical field of mineral processing, and provides a process for recovering phosphorus from vanadium titano-magnetite tailings, which comprises the following steps: S1, magnetic separation: carrying out ore grinding treatment and low intensity magnetic separation tailing discarding treatment on the vanadium titano-magnetite tailings to obtain magnetic minerals and non-magnetic minerals for later use; s2, pulp mixing is conducted, specifically, water is added into non-magnetic minerals, stirring is conducted, and ore pulp is obtained for standby application; a sodium carbonate aqueous solution is added into the ore pulp, stirring is carried out, a gangue inhibitor and water are added, stirring is carried out, a collecting agent and water are added, stirring and foam scraping are carried out, roughed concentrate and scavenging feed ore are obtained for standby application, and the gangue inhibitor is a mixture of modified water glass and sodium hexametaphosphate with the mass ratio being 1: (0.3-0.6); and S4, concentration is conducted, specifically, primary concentration, secondary concentration and third concentration are conducted on the roughed concentrate, and final phosphate concentrate is obtained. The process for recycling phosphorus from the vanadium titano-magnetite tailings has the advantages that the flotation reagent dosage is low, and the obtained phosphorus concentrate has the high phosphorus grade.

The invention relates to the technical field of education, and discloses a personalized intelligent tutoring system and method. According to the system, personalized intelligent tutoring is realized by constructing a digital resource library and comprehensively analyzing answering conditions of students. According to the technical key points, the method comprises the steps of evaluating test question quality and student learning cognition quality through a student test question answering big data analysis model, and generating a comprehensive analysis result; and through a personalized tutoring decision analysis model, specific reasons of wrong questions of the students are determined based on an analysis result, and corresponding tutoring measures are provided. The system can accurately identify weak links in learning according to double dimensions of test question quality and student learning cognition, formulate a targeted review scheme, and effectively improve the learning effect and review efficiency of students.

The utility model discloses a waste heat recovery device which comprises a base and is characterized in that a heat exchange tank is fixedly connected with the base through a connecting rod, and a spiral heat exchange coil pipe is arranged in the heat exchange tank; the upper end of the heat exchange coil fixedly communicates with one end of a high-temperature water outlet, and the lower end of the heat exchange coil fixedly communicates with one end of a low-temperature water inlet; the high-temperature water outlet fixedly penetrates through the upper end of the arc-shaped wall surface of the heat exchange tank, and the low-temperature water inlet fixedly penetrates through the lower end of the arc-shaped wall surface of the heat exchange tank; a heat exchange coil cleaning assembly is arranged in the heat exchange tank and used for cleaning water and rust on the surface of the heat exchange coil. The utility model relates to the technical field of heat treatment, in particular to a waste heat recovery device. According to the utility model, the water rust on the surface of the heat exchange coil pipe is cleaned through the arranged heat exchange coil pipe cleaning assembly, so that the heat exchange effect of the heat exchange coil pipe is ensured, and the service life of the heat exchange coil pipe is prolonged.

The invention relates to an efficient beneficiation process for recycling iron from iron tailings, which comprises the following steps of: feeding magnetite tailing pulp into a tailing recycling machine, feeding concentrate of the recycling machine into a first-section magnetic separator, and feeding concentrate of the first-section magnetic separator into a concentration magnetic separator; directly feeding concentrate of the concentration magnetic separator into a tower mill, feeding discharged ore of the tower mill into a swirler, and returning settled sand of the swirler to the tower mill to form closed-circuit ore grinding; overflow of the cyclone is fed into a second-stage magnetic separator, second-stage magnetic separator concentrate with the grade being 38% or above is obtained, and the second-stage magnetic separator concentrate is fed into a moxa sand mill; ore discharged by the moxa sand mill is fed into a third-section magnetic separator, concentrate of the third-section magnetic separator is fed into a fourth-section magnetic separator, concentrate of the fourth-section magnetic separator is fed into an elutriator, the concentrate of the elutriator is final concentrate, and the grade reaches 66% or above; the elutriator returns to the first section, the second section, the second section, the third section and the fourth section, and tailings of the magnetic separators are converged into comprehensive tailings. By optimizing the technological process, the concentrate grade is improved by more than 2%, and meanwhile, the tailing grade is reduced by 0.3%.

The invention provides a composite collecting agent for rare earth ore and application of the composite collecting agent in flotation, and relates to the technical field of rare earth flotation. The composite collecting agent is prepared from hydroxamic acid organic matter, ether organic matter and phosphate organic matter according to the mass ratio of (15-20): (3-8): (1-3). When the composite collecting agent is applied to flotation, after rare earth ore is crushed and ground, the rare earth composite collecting agent, an inhibitor and a foaming agent are sequentially added into ore pulp for flotation under the set ore pulp concentration, temperature and pH. When the composite collecting agent is applied to separation of rare earth minerals and gangue minerals, the main agent hydroxamic acid organic matter is selectively combined with metal ions on the surfaces of the rare earth minerals, selective separation of the rare earth minerals and gangue is achieved, the auxiliary agent ethers enhance the solubility of hydroxamic acid, the dosage of the hydroxamic acid is reduced, and the recovery rate of the gangue minerals is increased. The auxiliary agent phosphate reinforced hydroximic acid is used for recycling the rare earth ore, foam is improved, and the grade and the recycling rate of the rare earth ore concentrate are improved.

The present invention belongs to the field of mineral flotation, and specifically relates to a flotation preactivator for antimony oxide ore, comprising an electrolyte, a tartaric acid source and a sulfiding agent; the electrolyte is a water-soluble inorganic salt; the tartaric acid source is tartaric acid and its water-soluble salt; the sulfiding agent is a water-soluble organic sulfide containing at least one group of HS-, -S-. The present invention also includes a method for activating antimony oxide ore and flotation using the activator. In the present invention, the activator can effectively improve the flotation performance of the antimony oxide ore.

The invention relates to the technical field of leather processing, in particular to a leather forming processing device for automotive trim. The device comprises a pretreatment device and a mold device, the rear side of the mold device is connected and provided with a trimming device, the front side of the mold device is connected and provided with a heating device, and the mold device is internally provided and connected with a cooling device. The pretreatment device is used for improving the quality and the processing efficiency of leather, improving the consistency of products and effectively shortening the production cycle, the mold device is used for forming the leather, ensuring the size accuracy and effectively improving the consistency of the products, and the heating device is used for softening the leather, facilitating subsequent processing, improving the process effect and effectively improving the quality of the products. The cooling device is used for rapidly cooling leather, stabilizing the size and effectively improving the product precision, the trimming device is used for finely adjusting the leather and improving the finished product quality, and the safety monitoring device is used for guaranteeing the safety of the machining process and effectively improving the operation safety.

The invention relates to the field of chemical engineering and material engineering, and provides a method for preparing high-purity magnesium oxide through direct pyrolysis of magnesium sulfate. High-purity (hydrated) magnesium sulfate (MgSO4.nH2O, 0 < = n < = 7) is used as a raw material, the raw material is heated at 250-450 DEG C for 1-2 hours for dehydration and then ground into fine powder, high-temperature roasting is performed under the condition of no additive, and high-grade high-purity magnesium oxide (MgO > = 99.5 wt%) powder can be obtained. The magnesium oxide prepared by the method is high in purity, short in technological process and convenient for industrialization, SO2 gas generated by roasting can be recycled by lime water, and concentrated sulfuric acid by-products can be prepared by a traditional industrial method.

The invention discloses a concrete member crack measurement method based on a convolutional neural network, and relates to the field of concrete crack detection, and the method comprises the steps: carrying out the marking, size clustering, image enhancement, coordinate transformation and other preprocessing operations of a concrete member image, and constructing a detection model architecture; wherein the backbone network adopts a pre-trained ResNet-50 network to extract multi-scale features of the image; the box neck and the box head are used for generating local crack box output; the grid neck and the grid head are used to generate a global fracture grid output. In a model training process, local box output and global grid output are optimized by adopting a joint loss function, and prior category information of crack size clustering is introduced to guide learning of a detection model. In the reasoning stage, an image to be detected is input into the trained detection model, box output and grid output are obtained, and a final crack detection result is obtained through post-processing such as non-maximum suppression. And aiming at low crack detection precision under a complex background, the detection precision is improved.

The utility model belongs to the technical field of breeding environmental control equipment, and particularly relates to a small-window-free disease prevention livestock and poultry house adopting micro-positive pressure ventilation, which comprises a small-window-free livestock and poultry house, an environmental control host, an air supply pipe group communicated with the environmental control host, and air dispersion pipelines distributed on the air supply pipe group, the environment control host is erected outside the livestock and poultry house without the small window, and the air supply pipe group is hung below a roof of the livestock and poultry house without the small window; the small-window-free livestock and poultry house is of a window-free structure, and an air outlet is converged into the environment control host; according to the utility model, the side-wall-free small ventilation window design is adopted, and a positive-pressure active air supply mode is adopted in cooperation with the environmental control host; positive-pressure active air supply is achieved, fresh air is treated in a centralized mode, and pathogenic microorganism spreading caused by external air is avoided; air is uniformly dispersed and discharged, so that the cold and heat stress of livestock and poultry caused by large air supply temperature fluctuation is avoided; ventilation dead angles of the livestock and poultry house are reduced, the fresh air exchange amount of all areas of the livestock and poultry house is consistent, the air management efficiency of the livestock and poultry house is improved, the livestock and poultry breeding performance is improved, and the benefits of the breeding industry are integrally improved.

The invention discloses a power generation system for improving the flexibility of a boiler by coupling low-carbon fuel, and relates to the technical field of peak shaving of coal-fired units. A flue gas branch is arranged between a denitration device and an air pre-heater, and a chemical heat storage device and a flue gas adjusting plate are arranged at the joint of the flue gas branch; a flue gas adjusting plate opens a flue gas branch, so that flue gas generated by a coal-fired boiler enters a chemical heat storage device and absorbs heat in a fixed bed reactor, generated synthesis gas is output to a synthesis gas storage tank to be stored after a product is treated by a gas-liquid separator, generated liquid is recycled through a reactant storage tank, and in a heat release mode, the chemical heat storage device is connected with the fixed bed reactor. And the synthesis gas stored in the synthesis gas storage tank is input into the coal-fired boiler for combustion to improve the output of the coal-fired boiler. By coupling the low-carbon fuel, the waste heat of the flue gas at the tail part of the boiler is fully utilized to prepare the synthesis gas during load reduction; when the load rises, the variable load rate of the unit is increased through the synthesis gas, meanwhile, the grade of flue gas waste heat is improved, and the flexibility and the high efficiency of the unit are cooperatively improved.

The invention provides a method for preparing low-sulfate rare earth carbonate by using a mixed precipitator, and belongs to the technical field of hydrometallurgy. According to the method provided by the invention, after a sulfuric acid rare earth solution and a mixed precipitator solution are added in a parallel flow manner, a heat preservation reaction is performed. The mixed precipitant is used for precipitation, the alkalinity of the precipitant is improved, and carbon emission and wastewater amount in the precipitation process are effectively reduced. The method solves the problem of high content of sulfate radical impurities in the conversion process of rare earth chloride by a mixed sulfuric acid rare earth feed liquid ammonium bicarbonate precipitation method, and solves the problem of high cost caused by adoption of a related organic extraction agent in the conversion process of an extraction method. In the obtained rare earth carbonate, the REO content is 50-65%, and the sulfate radical content is 1t; and 0.01% of the total weight.