251 results about "Cleaner production" patented technology

The invention relates to the field of intelligent manufacturing, and discloses a production process regulation and control method based on big data, which comprises the following steps: collecting original data in a production process according to a sensor group, and carrying out data cleaning on the collected original data to obtain cleaned production process data; performing fusion processing according to the cleaned production process data to obtain a fused production process data set; establishing an initial prediction model according to the working condition classification data to obtain initial prediction model data corresponding to each working condition; the production process is regulated and controlled through big data analysis, the product quality can be monitored in real time, the process parameters are predicted, optimized and adjusted, so that the product quality is effectively improved, the quality deviation is reduced, key factors in the production process are accurately recognized and adjusted through the steps of data cleaning, fusion, classification, model optimization and the like, and the production efficiency is improved. Therefore, unnecessary production waste is reduced, and production efficiency is improved.

The invention discloses a solid waste-based zinc chloride preparation process control method and system, and relates to the technical field of zinc chloride preparation, and the method comprises the following steps: obtaining a unified time base line, establishing a bubble phase reference field, collecting a sound-induced echo sequence, a micro-pressure waveform sequence and a light scattering sequence of a reaction liquid under the bubble phase reference field, and calculating the solid waste-based zinc chloride preparation process. Fusing to generate a bubble density space-time matrix; and performing reversible time-frequency rearrangement based on the bubble density space-time matrix, decomposing to obtain different frequency band distributions, extracting a narrow-band resident bubble group, calculating critical volume distribution and collapse precursor indexes, and constructing a dynamic risk fingerprint database. According to the method, a unified time base line and a bubble phase reference field are constructed, the bubble state is perceived in real time, collapse forebodes are recognized, a dynamic risk fingerprint database is established, directional intervention and reverse energy channel collapse nucleus extinguishing are achieved in combination with an energy aggregation node, finally closed-loop regulation is constructed through calibration write-back, the safety and stability of zinc chloride preparation are improved, and the method is suitable for large-scale popularization and application. And efficient utilization and clean production of solid waste are promoted.

The invention belongs to the technical field of gold smelting wastewater treatment and resource utilization, and relates to a method for recycling gold by cooperatively treating tailings with acid wastewater, which comprises the following steps of: (1) concentrating the acid wastewater; (2) controlling the fineness of the roasting cyanidation gold extraction tailings; (3) removing impurities by acid; (4) adsorbing and recovering gold and silver by using thiourea leaching carbon; and (5) vulcanizing the acidolysis solution to recover copper and arsenic in a targeted manner. According to the method, efficient treatment is carried out through a five-stage treatment process, so that sulfuric acid in the acid wastewater is efficiently recycled, the roasting and cyaniding gold extraction tailings are comprehensively and efficiently utilized, resource high-value utilization and clean production of the acid wastewater and the roasting and cyaniding gold extraction tailings are achieved, and harm of the acid wastewater and the roasting and cyaniding gold extraction tailings to the environment is eliminated; the technological process is smooth, operability is high, the environment is excellent, and remarkable economic benefits, social benefits and environmental benefits are achieved.

The invention discloses a high-temperature solid oxide electrolyzed water hydrogen production system coupling photo-thermal power generation and thermochemical heat storage. The system comprises a power module, a thermochemical heat storage and air supply module, a water vapor supply module and a high-temperature solid oxide electrolyzed water module. The photo-thermal power generation system provides clean electric energy and high-temperature heat energy, the thermochemical heat storage module achieves high-density storage and on-demand release of heat energy through reversible reaction, the intermittent problem of renewable energy sources is solved, and high-temperature stable operation of an SOEC electrolytic cell is ensured. Through the coupling design of the thermochemical heat storage system and the SOEC, heat flow distribution is optimized, energy consumption of traditional electric heating is reduced, the external steam heating requirement and the hot air requirement are reduced, the total energy cost of hydrogen production is reduced, and the unit hydrogen production cost is remarkably reduced. The thermochemical heat storage module can stabilize the volatility of photo-thermal power generation, so that the system can still stably supply energy when sunlight is insufficient, the utilization rate of renewable energy sources is increased, clean production of green hydrogen is achieved, and the carbon neutralization target is met.

The invention relates to the technical field of aluminum oxide clean production, in particular to a method for treating gibbsite through high-temperature calcification transformation based on source blocking, which comprises the following steps: mixing high-iron bauxite, a calcium compound and Bayer mother liquor, and then carrying out pulpifying to obtain ore pulp; conveying the ore pulp to a high-pressure dissolution reactor to obtain transformed red mud; separating and washing the transformed red mud by using a vortex rapid settling tank; and adding a binder into the washed and dried transformed red mud to prepare small balls, and roasting, hardening and solidifying to obtain ironmaking pellets. According to the method, Bayer process flow equipment can be directly adopted, the method has the characteristics of simple process and equipment, high production efficiency and the like, the transformed slag serves as a pellet raw material to be directly used for producing pellets, no solid waste is generated in the whole process, and finally harmless, high-valued and full-quantized consumption of the red mud is achieved; and the worldwide problem that a large amount of red mud is discharged in the aluminum oxide production process is thoroughly solved.

The invention relates to the technical field of comprehensive recovery and resource utilization of gold dressing and smelting, in particular to a method for comprehensively recovering valuable elements by resource utilization of roasting cyanidation tailings. Comprising the following steps: S1, acidifying and curing the roasted cyanidation tailings; s2, carrying out high-acid leaching on the acidified and cured filter cake; s3, recovering gold, copper and iron; s4, roasting the high-acid acid leaching residues and the copper-zinc-silver oxide ore; s5, recovering copper and zinc from the roasted ore; and S6, gold and silver are extracted from the copper-zinc acid leaching residues. Valuable elements in the roasting cyanidation tailings are efficiently recycled and utilized, high-value utilization and clean production of resources of the roasting cyanidation tailings are achieved, the technical problem that the valuable elements in the roasting cyanidation tailings are difficult to effectively recycle is solved, the technological process is smooth, operability is high, the environment is good, and the method is suitable for industrial production. The method has remarkable economic benefits, social benefits and environmental benefits.

The application discloses a method for recovering nickel and phosphorus from electroless nickel plating waste liquid, and the method comprises the following steps: preparing nickel sulfate through extraction and stripping, and preparing iron phosphate through Fenton oxidation and precipitation; compared with the prior art, the method is characterized in that the waste liquid is pretreated, insoluble solid particles in the waste liquid are removed, emulsification of an extractant caused by particles in a subsequent extraction process is prevented, damage to extraction oil is avoided, and the extraction efficiency is ensured; in addition, the extractant used in the method can be recycled, secondary pollution is avoided, and the method is economical and practical; in the method, main pollutants in waste water are all converted into important chemical raw materials, recycling is realized, sulfuric acid and Fenton reagents used are all converted into terminal products, difficulty of end waste water treatment is not increased, clean production is met, the treatment cost is low, the product has high added value, and the method has strong practicability.

The invention provides riveting and slag removing integrated automation equipment for a pipe base movable joint and a method for producing the movable joint through the equipment, and relates to the technical field of connection of rigid pipes. According to the automatic burr and residue removing device, automatic burr and residue removing and centralized treatment are carried out on the riveted and assembled pipe base movable joint, and the excellent working environment is guaranteed while the product quality and the production efficiency are improved; the device specifically comprises an automatic table type riveting mechanism, an automatic part feeding mechanism and a riveting part slag removing mechanism. By means of automatic integrated design, accurate structure optimization and an environment-friendly treatment mechanism, efficient, high-quality and clean production of the pipe base movable joint is achieved, and the comprehensive production benefit is remarkably improved; the equipment integrates three core functions of riveting, feeding and slag removal, automation of the whole process from part feeding to finished product collection is achieved, manual intervention is reduced, and the labor intensity is lowered.

The invention relates to the technical field of waste lithium battery recycling, in particular to a battery pole piece laser separation device and method. The laser processing device is provided with a tensioning and unfolding mechanism and a multi-axis laser control mechanism, the tensioning and unfolding mechanism forms a compression roller clamping cavity through compression roller feeding assemblies at the two ends of a rack, and the double clamping cavities synchronously clamp the unwound battery pole piece, so that the battery pole piece is kept tensioned in a laser processing area; and the latter drives the laser to move in a three-dimensional space according to a predetermined route by a mobile end with the laser, and the electrode material and the current collector are separated in a non-contact laser lift-off mode. Dust pollution caused by physical grinding is avoided from the source, mechanical contact is avoided, a current collector cannot be damaged, machining precision is guaranteed through pole piece tensioning, efficient stripping of an electrode material is achieved through laser precise energy control, precise recycling of the material can be achieved in cooperation with sorting, the recycling purity and value are improved, the green and clean production requirement is met, and the device is suitable for large-scale recycling operation.

The invention discloses a magnetic separation, enrichment and recovery process for low-grade vanadium titano-magnetite, which belongs to the technical field of comprehensive utilization of vanadium titano-magnetite, adopts a combined mineral separation process of dry pre-enrichment and tailing discarding, wet grinding, concentration and refinement, combination of gravity and magnetism and middling retreatment, selects mature industrial equipment and optimizes the combination. High-efficiency dry pre-selection equipment, wet grinding equipment, a multi-section reselection and middling retreatment system and solid-liquid separation equipment are utilized, a large amount of tailings are discarded at the front end of a mine, iron and titanium are efficiently separated and comprehensively recycled in the middle main process, the recycling rate bottleneck is broken through through the middling retreatment technology, near-zero discharge of wastewater is achieved, and compared with a conventional process, water can be saved by 50-60%, and the economic benefit is high. According to the method, the grinding and separation cost is saved by 60-70%, the energy-saving effect is remarkable, the purposes of cost reduction, efficiency improvement, comprehensive utilization of resources and clean production are achieved, the production and technical problems of low-grade vanadium titano-magnetite mine enterprises in arid and water-deficient areas are effectively solved, and the method is suitable for large-scale production and application.

This invention belongs to the field of pharmaceutical drying technology and discloses a pharmaceutical drying and automatic lifting mixing device based on negative pressure fluidization, including a machine body, a lifting cylinder, and a second waste gas guide channel. In use, the invention drives the spiral lifting blades through a waste gas power transmission component, achieving automatic lifting and discharge of the dried material. This eliminates the need for manual transfer, reducing operator workload, improving production efficiency, and avoiding material contamination during transfer, thus meeting the clean production requirements of the pharmaceutical industry. Simultaneously, the pneumatic reciprocating lifting component drives the periodic lifting and lowering of the material plate, continuously agitating the material during the drying process. This breaks the limitations of static drying in existing equipment, ensuring that the material is uniformly exposed to hot air from all directions. This avoids problems such as uneven heating, clumping, and incomplete drying caused by material accumulation, guaranteeing the drying quality of pharmaceutical materials and preventing the destruction of active ingredients.

This invention belongs to the field of oilfield downhole operation technology and discloses a sucker rod oil scraping and anti-pollution device, including: a pre-works flange for sealing and covering the sucker rod; a mounting screw connected to the pre-works flange; and an oil collection tank connected to the pre-works flange via the mounting screw. The oil scraping assembly includes: a mounting plate, a triangular cover, an octagonal elastic scraping disc, elastic strips, a segmented elastic contraction scraping core, and an annular rubber ring. It can effectively absorb and buffer the gas pressure generated during sucker rod movement, smoothly discharge the gas inside the cavity, and prevent crude oil splashing. Simultaneously, the flexible elastic strips achieve large-area oil removal, and the upper segmented elastic contraction scraping core, combined with a dynamic pressing structure, scrapes away residual oil film. This dual protection significantly improves scraping efficiency and sealing performance, solves the problem of oil leakage and pollution, and provides a reliable guarantee for clean production in oilfields.

The utility model discloses a plasma coating manufacturing dust-free clean production line, which comprises a dust-free spraying bin and a drying production line, the dust-free spraying bin comprises a base and a paint control assembly, a spraying bin body is installed on the upper side of the base, a spraying assembly sliding rail is installed at the bottom of an inner cavity of the spraying bin body, and a dust-free spraying assembly is installed on the drying production line. A universal spraying assembly is slidably mounted on the spraying assembly sliding rail and connected with the coating control assembly, and a discharging and filtering assembly communicating with an inner cavity of the spraying bin body is mounted on the upper portion of the side face of the spraying bin body. According to the plasma coating manufacturing dust-free clean production line, the cleanliness of the production environment can be effectively improved, the temperature and humidity in the plasma coating spraying environment can be adjusted and controlled, production and preparation of radio frequency plasma operation electrode products are facilitated, the plasma coatings can be dried after being sprayed, the temperature in the drying process is stable, the conveying speed is controllable, and the production efficiency is improved. And the drying quality of the plasma coating is ensured, and the product percent of pass is improved.

This utility model discloses a fixed-point dust removal device for clean production of bauxite, relating to the field of dust removal technology in bauxite production. It includes a dust removal chamber with a collection chamber inside. Ventilation chambers and water storage chambers are respectively located on the left and right sides of the upper end of the collection chamber. The collection chamber, water storage chamber, and ventilation chamber are separated by partitions. A central shaft is installed at the front center of the dust removal chamber. Four side support plates are arranged in a circumferential array on the outer wall of the central shaft. A fixing ring plate is installed on the outside of the four side support plates, and a sealing plate is installed between adjacent side support plates. This utility model, through a series of structures, utilizes the triple action of wind, water cleaning, and mechanical scraping during dust removal to clean stubborn dust and impurities, while preventing dust from escaping during cleaning, thus efficiently cleaning dust in specific areas.

The invention discloses a method for treating tungsten wastewater containing ammonia nitrogen. The method comprises the following steps: subjecting the tungsten wastewater containing ammonia nitrogen to pressure filtration, acid adjustment, and an RO desalination system for treatment, thereby significantly improving the enrichment effect and removal efficiency of ammonia nitrogen, reducing the amount of wastewater entering a stripping tower for treatment, saving treatment costs, and improving the efficiency of tungsten wastewater treatment. The method ensures that the effluent water quality indicators meet the standards and can be directly discharged or reused, thereby reducing the amount of discharged wastewater, and realizing efficient treatment of tungsten wastewater, green and clean production, and resource recycling.

The invention discloses an infrared heating lead storage battery cast-welding device and a cast-welding method, an upper row of symmetrical infrared heating pipes and a lower row of symmetrical infrared heating pipes are adopted to carry out surrounding type precise temperature control on a cast-welding bottom die, the heating temperature is uniform, the heating speed is high, the die temperature is controllable, and a large amount of lead smoke pollution and lead slag generated by continuous high-temperature lead melting of an open lead melting furnace are thoroughly eliminated. Clean production of a production line is achieved, and production energy consumption is reduced. A lead liquid adding mechanism composed of a lead wire supply unit, a hot melting spray head and a closed lead liquid groove is matched with quantitative lead wire conveying driven by a servo motor and an adding hole controlled by a switch air cylinder, so that lead wires are accurately melted according to needs, and molten lead liquid is accurately and controllably injected into a cast-weld cavity through a switch valve in a closed environment. Volatilization and sputtering of lead liquid and waste of excess materials are avoided, and the utilization rate of raw materials is increased. According to the whole set of device, through modular design and an automatic transfer system, full-process automatic circulation and accurate positioning of the cast-weld bottom die in the production link are achieved.

The invention provides a coupling power generation process for directly synthesizing dimethyl ether through plasma co-gasification. According to the invention, the production process is simplified, the supercritical CO2 Brayton cycle is integrated, and efficient waste heat and power generation recovery is realized. In order to utilize carbon dioxide in waste gas, an alkaline electrolytic cell hydrogen production process and a carbon dioxide hydrogenation methanol process are systematically introduced. Model verification and sensitivity analysis confirm the reliability of the system and reveal the significant influence of key operation parameters on the system performance. The invention provides an innovative path for efficient utilization of biomass and clean production of methanol and dimethyl ether, and effectively balances resource utilization and environmental protection.

The invention relates to the technical field of construction materials, in particular to a clean preparation method of Portland cement clinker for concrete, which is characterized in that coal gangue and ardealite are used as raw materials, and low-heat Portland cement clinker is prepared by a preparation process of'low-temperature calcination + hydrothermal synthesis + low-temperature calcination '. The method comprises the following steps: S1, pretreatment; S2, ingredient design; s3, carrying out primary calcination; s4, carrying out hydrothermal synthesis; s5, carrying out secondary calcination; the Portland cement clinker is prepared from industrial solid wastes such as coal gangue and ardealite as raw materials, remarkable environmental protection and resource utilization benefits are achieved, clay and limestone are replaced with the solid wastes, ecological damage caused by mining is reduced, energy consumption is greatly reduced through the low-temperature calcination process compared with traditional cement production, no carbon dioxide is discharged in the whole process, and the method is environmentally friendly. The prepared low-heat Portland cement clinker takes dicalcium silicate and dicalcium aluminosilicate as main minerals, solid waste resources are fully utilized, and the ecological environment is facilitated.

This invention provides a wastewater recycling system for high-temperature metal blackening production, belonging to the field of high-temperature metal blackening cleaning technology. It includes a support frame with a pretreatment structure fixedly installed on its top surface and a primary sedimentation mechanism fixedly installed on its bottom surface. An adjusting cylinder drives an internal movable pipe to move a cleaning nozzle, performing online high-pressure rinsing of the filter windows, effectively preventing filter plate clogging and ensuring long-term stable operation of the sedimentation tank. The maintenance cycle is extended from once a week to once a month. Seamless connections are achieved between various mechanisms via a clean water pump, a drain valve, an oxidation pump, a cooperating pump, a side pump, and a filter pump, ensuring a closed-loop operation of wastewater from inlet to reuse. Practical application verification shows that the wastewater recycling rate of this system can reach over 85%, an improvement of more than 50 percentage points compared to traditional processes. It can save enterprises a significant amount of fresh water and sewage discharge costs annually, resulting in substantial economic benefits.

The invention belongs to the technical field of gold smelting comprehensive treatment and resource utilization, and relates to a method for comprehensively recovering sulfur and iron by treating acidic wastewater with alkaline waste residues, which comprises the following steps: (1) neutralizing primary acidic wastewater; (2) preparing pellets from the secondary neutralization slag filter cake and cyanidation tailings; (3) roasting the third-stage pellets at high temperature to collect sulfur; and (4) iron ore concentrate is recycled through four-stage magnetic separation. The technological method is simple and easy to implement, sulfur elements and iron elements in the acid wastewater and the cyaniding gold extraction tailings are efficiently recycled, the alkaline waste residues are comprehensively and efficiently utilized, resource high-value utilization and clean production of the acid wastewater and the alkaline waste residues are achieved, meanwhile, the cyaniding gold extraction tailings are cooperatively treated, and the environmental pollution is reduced. The harm of acid wastewater, alkaline waste residues and cyaniding gold extraction tailings to the environment is eliminated, the technological process is smooth, operability is high, the environment is excellent, and remarkable economic benefits, social benefits and environmental benefits are achieved.

The invention relates to the technical field of ferrous metallurgy, in particular to a converter steelmaking method based on waste steel replacement and dynamic regulation, which comprises the following steps: using a self-circulation iron-containing material as a cold material to replace outsourcing waste steel; the self-circulation iron-containing materials comprise channel line slag steel generated by splashing of a converter, sintered slag steel formed after red slag generated at the converter blowing end point is subjected to magnetic separation through a steel slag treatment line, and iron sheet balls pressed by oxide scale generated in a steelmaking workshop; and top-bottom combined blowing process parameters of the converter are optimized. The method has the advantages that a large amount of self-circulation iron-containing materials of road line slag steel, sintered slag steel and iron sheet balls generated in enterprises are used for directly replacing outsourcing waste steel with high price, and the raw material purchasing cost is greatly reduced; efficient resource recycling of iron-containing solid waste in the steel mill is achieved, waste is turned into wealth, the solid waste discharge treatment cost is reduced, and the requirements of circular economy and clean production are met; through the matching process optimization of strengthening top and bottom combined blowing, the stirring of a molten pool and the slag-gold reaction efficiency are improved, and splashing is inhibited.

The application discloses a production process of potassium fulvate of mineral origin, which uses weathered coal and / or lignite as raw materials, and comprises the following steps: raw coal slurry preparation, ultrasonic-assisted weak-alkali low-temperature closed-loop extraction, double-stage centrifugal separation and solar drying system drying to prepare high-activity potassium fulvate of mineral origin. The extraction is carried out at 45-55 DEG C, pH 11-12, ultrasonic power 3-5 kW and frequency 25-30 kHz for 30-60 min, and the extraction rate of fulvic acid is 65%-75%; the solar drying system is configured with an automatic turning and throwing system, a circulating ventilation system and a meteorological linkage system, and the crude liquid with a water content of 75% is dried to 15% in the whole process without waste water and carbonization. The application has the advantages of high extraction rate, low energy consumption, short time, high product activity, high small molecule content, no residue in full water solution at 25 DEG C and suitability for large-scale clean production.

The invention discloses a high-temperature heat storage material cost optimization method and system, and relates to the field of high-temperature heat storage material cost optimization. According to the high-temperature heat storage material cost optimization method and system disclosed by the embodiment of the invention, a dual-drive mode of a solid waste resource coupling process and a policy lever is constructed, high-quality carbon fibers are efficiently produced by utilizing waste resources of an inferior coal power plant, and remaining residues are treated by a special process to form a novel high-temperature heat storage material; the directional conversion process of coal-series solid waste is formed, the problem of preparation of solid waste in the whole life cycle through SiC is completely solved, the requirements of a national clean production promotion method and an energy-saving method are met, waste generated by a project is effectively utilized, harmlessness and recycling of garbage are truly achieved, and the double targets of energy circulation and clean production are achieved.

This invention relates to the field of inorganic fine chemical material preparation technology, and discloses a method for preparing high-purity ultrafine calcium fluoride based on dynamic pH-controlled gradient crystallization. The method uses industrial-grade calcium carbonate and fluorosilicic acid as raw materials. Its core is based on dynamic pH gradient control of the reaction mechanism, precisely dividing the calcium fluoride crystallization process into three stages: primary nucleation, secondary growth, and tertiary purification. Through the coordinated matching of parameters such as pH, temperature, and stirring rate at each stage, complete separation and control of nucleation and growth are achieved, ultimately producing high-purity ultrafine calcium fluoride powder with a purity ≥99.9% and a particle size of 1–5 μm. This invention features low raw material costs, strong process controllability, and the main byproducts are CO2 and silicic acid, both of which can be recycled. No fluoride-containing wastewater is discharged during the process, achieving clean production. Furthermore, the process has high stability and is suitable for large-scale industrial production, offering significant economic and environmental benefits.

The utility model discloses a wastewater zero discharge system in a furfural production process. The wastewater zero discharge system comprises a hydrolysis kettle, a stock solution condenser, a stock solution distillation tower, a wastewater tank, a wastewater evaporator and a concentrated solution tank, the device has the advantages that secondary steam generated by the wastewater evaporator is used as a heat source in the hydrolysis process and then converted into aldehyde gas; the aldehyde gas condensate is distilled by the stock solution distillation tower to generate wastewater again, and the wastewater is discharged from the bottom of the tower to form a closed cycle; evaporation concentration residual liquid generated by the wastewater evaporator is used for preparing dilute acid in the hydrolysis process, so that wastewater is not discharged, meanwhile, 1-2% of acetic acid and a small amount of furfural in the wastewater can be effectively recycled, the use amount of sulfuric acid is reduced, and the yield of furfural is increased; moreover, the consumption of the sulfuric acid is reduced, so that the sulfur content in the boiler flue gas can be reduced, the pollution to the atmosphere is reduced, and clean production of furfural is realized.

The utility model discloses an ammonia still top waste heat recovery and ammonium sulfate mother liquor heat exchange or coal gas preheating heat exchange system, and particularly relates to a heat source for recovering ammonia gas waste heat at the top of an ammonia still in the coal chemical industry to be used for ammonium sulfate saturator mother liquor heating or ammonium sulfate coal gas preheating and other various low-grade heat users. An ammonia still top waste heat recovery and ammonium sulfate saturator heat exchange system comprises an ammonia still, a dephlegmator, a condensation cooler, a mother liquor circulating pump, a heat recovery pump, a saturator, an ammonium sulfate mother liquor heater, an auxiliary heater and the like. Waste heat of mixed fluid of ammonia gas and water vapor discharged from a dephlegmator at the top of an ammonia still tower is recovered, and a specially designed heat exchanger group is used for heating circulating mother liquor of a spray type saturator for producing ammonium sulfate to reach a set temperature; the traditional heat supply mode of heating ammonium sulfate mother liquor by using new steam as a heat source and preheating coal gas by using new steam, which is widely used at present, is replaced; and a heat exchange network for gradient utilization of energy is established, so that the purpose of energy-saving, low-carbon, environment-friendly and knotting-clearing production is achieved.

The invention discloses an agricultural and forestry waste-based recoverable foam material as well as a preparation method and application thereof, and belongs to the technical field of environment-friendly materials. The composite material comprises the following components in parts by weight: 1-50 parts of biomass waste wood and bamboo fiber powder, 10-40 parts of natural inorganic powder, 10-30 parts of thermoplastic resin, 1-3 parts of an environment-friendly foaming agent and 2-5 parts of a compatilizer. The foam material prepared by the invention presents a unique three-dimensional porous network structure, has mechanical properties of light weight and high strength, ecological properties of green and environmental protection and recyclable characteristics, shows excellent environmental adaptability and engineering practicability in sand barrier engineering application, and has a wide application prospect. The problems that a traditional sand barrier material is difficult to degrade and causes secondary pollution after being discarded are thoroughly solved, meanwhile, an environment-friendly foaming technology and a green auxiliary system are adopted, the technological process is short, energy consumption is low, no three wastes are discharged, and the requirements of circular economy and clean production are met.

This invention relates to the field of conductor technology and discloses an aluminum-welded nickel sheet, comprising: an aluminum busbar with an insulating layer on its outer surface; a central bending zone formed by integrally bending the aluminum busbar; and aluminum ports at both ends of the aluminum busbar, formed by bending the ends of the aluminum busbar outwards and connecting to the aluminum busbar at right angles. This aluminum-welded nickel sheet utilizes pure nickel strip directly coated onto the outer surface of the aluminum ports via hot-press welding, replacing the traditional electroplating process. This avoids complex processes such as multiple chemical pretreatments, plating solution deposition, and post-treatment, significantly improving product yield and production stability. Simultaneously, it completely eliminates the emission of heavy metal wastewater, harmful gases, and chemical pollutants generated during electroplating, achieving clean production from the source. This aligns with the requirements of green manufacturing and sustainable development, reduces environmental pollution burden, and circumvents increasingly stringent environmental regulations.

The invention discloses a coal blocking prevention device for a thermal power plant, and relates to the technical field of coal blocking prevention, the coal blocking prevention device for the thermal power plant comprises a supporting platform and further comprises a first fixing frame and a second fixing frame, and the first fixing frame and the second fixing frame are installed at the top of the supporting platform. Therefore, it is guaranteed that the dust cover can be stably installed above the conveying belt mechanism, and meanwhile part of equipment can be conveniently and rapidly disassembled and assembled during daily maintenance. Damage of high-frequency low-amplitude vibration to the conveying belt and the structure of the conveying belt is far smaller than that of a traditional powerful vibrator; through the design of the detachable recovery box and bolt connection, daily maintenance and repair are greatly facilitated, dust dissipation is effectively restrained through the fully-closed dustproof cover and internal equipment, the working environment is improved, centralized treatment and recycling of residues also meet the requirement for clean production, and through the design of the weight box, the bottom damp-proof plate, the multiple supporting bases and the damping plates, the service life of the device is prolonged. And stable operation of the whole set of heavy equipment in a complex industrial environment is jointly guaranteed.

The invention provides a method for preparing magnesium oxide by calcining magnesite, which comprises the following steps: introducing fuel into a decomposer or into the decomposer and an activity regulator, igniting, and discharging generated high-temperature flue gas after flowing through a multi-stage preheating unit, a drying unit and a tail gas separation unit, feeding a water-containing magnesite raw material into a dryer to be in contact with hot flue gas from a preheater so as to remove moisture; the dried material passes through a multi-stage preheater and is subjected to countercurrent flow heat exchange with high-temperature flue gas from a decomposer, so that the temperature of the material is increased; the preheated material is heated to the decomposition temperature in a decomposer, and magnesium carbonate is decomposed to generate magnesium oxide; separating the decomposed gas-solid mixture to obtain a high-temperature magnesium oxide solid; and performing countercurrent flow heat exchange on the high-temperature magnesium oxide solid and combustion-supporting air, and outputting cooled magnesium oxide. Through multi-stage countercurrent flow heat exchange and product sensible heat recovery, an efficient heat energy circulation system is constructed, and the fuel energy consumption in the calcination process is remarkably reduced; the method realizes flexible regulation and control of magnesium oxide product activity, and is suitable for continuous clean production of fine particle raw materials.