51results about How to "The process is clean and environmentally friendly" patented technology

A process for all-wet recovery of valuable elements in a complex low-grade sulphide ore comprises the following steps: crushing and grinding a raw material, sieving the crushed and ground raw material, performing size mixing by use of a sodium hydroxide solution, and after that, performing pressurized oxidizing leaching to obtain an alkaline-leached solution and alkaline-leached residues; acidizing the alkaline-leached solution to obtain a lead sulfate product and a heavy lead solution, and performing potential reduction control step by step on the heavy lead solution to obtain crude selenium powder, crude tellurium powder and a post-reduction solution; performing copper-soaking on the alkaline-leached residues by use of a sulfuric acid solution to obtain copper-leached residues and a copper-leached solution; performing antimony and bismuth soaking on the copper-leached residues by use of an acid liquor containing chloride ions to obtain an antimony-leached solution and antimony-leached residues, feeding the antimony-leached slags to noble metals for recovery, and adjusting the pH of the antimony-leached solution step by step to obtain antimony residues and bismuth residues; adjusting the pH of the copper-leached solution to obtain iron residues and an iron-removed solution, wherein the iron residues serve as a waste water treatment additive, and the iron-removed solution is subjected to zinc dust replacement to obtain copper powder and a post-replacement solution; and merging the post-reduction solution and the post-replacement solution, and performing concentration and crystallization to obtain heptahydrate. The process is good in comprehensive recovery effect, strong in adaptation to the raw material, clean and environment-friendly in process, low in demand on equipment, adjustable in implementation scale and high in practicability.

The invention discloses a refining method of an N-methyl pyrrolidone product. A classifying and condensing system is arranged on the upper portion of an N-methyl pyrrolidone product rectifying tower,and comprises two or more temperature-controllable heat exchangers and corresponding refluxing tanks. The refining method comprises the following specific steps: feeding N-methyl pyrrolidone which requires to be purified into a rectifying tower for distilling; carrying out primary condensing on an overhead product of the rectifying tower; feeding a gas-phase product subjected to primary condensinginto a secondary heat exchanger for condensing; feeding a liquid-phase product subjected to primary condensing into a primary refluxing tank; discharging a gas product subjected to secondary condensing; refluxing a liquid-phase product subjected to secondary condensing to the rectifying tower; and refluxing part of the products in the primary refluxing tank to the rectifying tower, and meanwhileextracting the other part of the products as an N-methyl pyrrolidone refined product. The refining method of an N-methyl pyrrolidone product is low in investment, low in energy consumption and easy tooperate, and free amines and light impurities are removed simply and effectively to obtain the high-quality N-methyl pyrrolidone product.

The invention discloses a comprehensive recovering method for tailings containing precious metal. The comprehensive recovering method specifically includes the following steps that the tailings are led into oxygen to be subjected to oxidizing roasting; oxidation leaching is conducted on zinc calcine through sulfuric acid, most of iron is removed, a leaching agent is evaporated and crystallized, and industrial iron sulfate is obtained; after chloridizing leaching is conducted on leaching slag through sulfuric acid and sodium chloride, the leaching slag serves as lead-rich slag to be sent to a lead smelting enterprise; replacement is conducted on the leaching agent through iron powder, and crude gold and silver mixtures are obtained and sent to a precious metal deep processing system; and PH of replacement fluid is adjusted through ammonium water or sodium hydroxide, iron is deposited, obtained ferric hydroxide is roasted to obtain iron oxide red, and the iron oxide red serves as the raw material of the coating industry. According to the technology method, the influences on the environment due to long-term stacking of the kind of slag are eliminated, the process is clean and environmentally friendly, and secondary pollution is avoided.

A pretreatment leaching process of flotation zinc oxide concentrates includes the following steps that a small amount of concentrated sulfuric acid is added into the flotation zinc oxide concentrates and stirred evenly; heat-preservation curing is carried out on obtained mineral powder at a low temperature to partially decompose flotation chemicals on the surface of the flotation zinc oxide concentrates; the obtained clinkers are leached out with waste electrolytes, filtered and separated; and finally, a small amount of active carbon is added into the zinc sulfate solution obtained after filtering and separation for adsorption, filtering and separation are carried out again, and zinc oxide concentrate leachate is obtained. The pretreatment leaching process of flotation zinc oxide concentrates has the advantages of being simple, environmentally friendly and the like, can optimize the leaching conditions of the concentrates, and resolves the problems of residual floatation chemicals and the like.

The invention discloses a generator provided with a switching catalytic combustion gas turbine in the technical field of dynamic power generation, wherein the outlet and the inlet of an air filter are connected with low calorific value fuel gas, the outlet of the air filter is connected with the inlet of a centrifugal compressor, the outlet of the centrifugal compressor is connected with the inlet of a four-way valve, the outlet of the four-way valve is connected with one end of a catalytic combustion chamber, a heat accumulator at the other end of the catalytic combustion chamber enters a centripetal turbine, the outlet of the centripetal turbine is connected with the atmosphere directly, a flam ignitor is started and inserted in a cavity of the catalytic combustion chamber, the centrifugal compressor is coaxial with the centripetal turbine, an output shaft at the centrifugal compressor end is connected with a high-speed shaft of a reduction gear box through a shaft coupling, and a low-speed shaft of the reduction gear box is connected with a generator shaft through the shaft coupling. The fuel net content of the low calorific value fuel gas adopted by the generator is less than 5 percent and the heat value of the low calorific value fuel gas is lower than 2 MJ/NM3, and the generator adopts catalytic combustion so that the fuel gas is usually exhausted into the atmosphere directly, and not only the energy is used but also the discharge of greenhouse gas is reduced.

The invention provides an environment-friendly regenerated activated carbon production process, and belongs to the technical field of activated carbon recovery. The production process comprises the following steps: carrying out micro-oxidation on the surface of hot air, grinding, carrying out vacuum extraction, sequentially carrying out immersion cleaning with an acid-base solution to obtain a recovered material, heating the recovered material, quickly immersing in low-temperature liquid nitrogen, loading potassium ferrate, carrying out high-temperature activation, then mixing with weakly viscous pulverized coal, pressing, molding, and carrying out secondary activation to obtain activated carbon. According to the method, adsorbate on the activated carbon is separated and desorbed through grinding refining and vacuum extraction, low-temperature liquid nitrogen and pore channel loaded potassium ferrate are decomposed to recover a pore structure of the activated carbon, recycling of the waste activated carbon is achieved, and the process has important significance on the comprehensive utilization efficiency of resources.

The invention provides a resourceful treatment system for a mixed salt solution and a resourceful treatment method. The resourceful treatment system comprises a gypsum synthesis unit, an evaporation unit and a reaction unit which are sequentially connected in the material flow direction, the resourceful treatment system further comprises a calcining unit, an ammonia distillation unit and a salting-out unit which are respectively connected with the outlet of the reaction unit, wherein an outlet of the calcining unit and an outlet of the ammonia distillation unit are combined into one path and then are connected into the reaction unit, the ammonia distillation unit is further connected with the gypsum synthesis unit, and the salting-out unit is circularly connected with the evaporation unit.The method aims at the characteristics of a mixed salt solution of sodium chloride and sodium sulfate; sodium sulfate and calcium chloride in a normal-pressure sodium chloride solution are synthesized into alpha-semi-hydrated high-strength gypsum, sodium chloride and ammonium bicarbonate react to prepare sodium carbonate, ammonium chloride is prepared through freezing salting-out in a combined-soda method, and other technologies are organically coupled, so that the sodium chloride and sodium sulfate mixed salt solution recycling system and the method are provided.

The invention discloses a regeneration method for a waste mercuric chloride contact agent and belongs to a recycling technique of the waste mercuric chloride contact agent. The regeneration method comprises the following steps: firstly, performing wet-process leaching on the waste mercuric chloride contact agent, performing leaching reaction under an ultrasonic effect, and filtering, thereby acquiring a mercury-containing filtrate; controlling temperature, adding a neutralizer for regulating pH value, completely converting mercury ions in the solution into mercuric oxide sediments, and keepingtoxic phosphor and sulfur in the mercury contact agent still in the solution; dissolving mercuric oxide with hydrochloric acid, thereby acquiring a mercuric chloride solution used for preparing the mercury contact agent; performing microwave high-temperature activating on filter residue (waste contact agent for mercury removal) under the condition of activating gas, thereby acquiring a regenerated activated carbon for waste mercury contact agent; soaking the activated carbon for waste mercury contact agent in a mercuric chloride solution for waste mercury contact agent, thereby acquiring a new mercuric chloride contact agent. According to the invention, efficient recycling of mercuric chloride and regeneration of activated carbon can be simultaneously realized in the manner of combining ultrasonic acidizing leaching with microwave high-temperature activating treatment.

The invention provides a collaborative extraction system of magnesium and lithium in salt lake brine and a treatment method thereof. The collaborative extraction system mainly comprises a spraying roasting system, a dust removing system, a pulping washing device, a solid-liquid separation device, a magnesium extracting unit, a lithium extracting unit and a smoke treatment system, wherein productsof the magnesium extracting unit comprise magnesium oxide; products of the lithium extracting unit comprise magnesium hydroxide precipitates and lithium carbonate; and the magnesium hydroxide precipitates are fed in the magnesium extracting unit for magnesium extraction. Wet reaction separation is organically coupled with pyrogenic purification; a traditional technological process for extracting salt lake brine elements is integrated to realize high-value collaborative extraction of valuable elements-magnesium and lithium in the salt lake brine; meanwhile, smoke afterheat is fully used in theextracting process to realize gradient utilization of heat; no waste water and no waste slag are generated; the tail gas emission is qualified; and the collaborative extraction system belongs to a green cleaning technological process.

The invention provides a method for preparing ceramsite from acidic vanadium extraction tailings, and the method comprises the following steps of: carrying out slurrying leaching and liquid-solid separation on the acidic vanadium extraction tailings to obtain a leaching solution and leaching residue, and carrying out adsorption treatment on the obtained leaching solution; and washing and neutralizing the leaching residue, mixing the obtained neutralized residue with auxiliary materials, and conducting granulating and roasting to obtain a ceramsite product. According to the method, high-efficiency recovery of valuable metal vanadium is realized through slurrying leaching of the acidic vanadium extraction tailings and adsorption; the leaching residue is washed and neutralized and then prepared into ceramsite together with the auxiliary materials, so that harmlessness and recycling of various solid wastes are realized; the method is simple to operate and low in cost, the technological process is clean and environmentally friendly, and good economic benefits and application prospects are achieved.

The invention relates to a method for preparing a mercury-containing catalyst by combining microwave with ultrasonic regenerated coal, and belongs to the technical field of recycling of coal preparedwaste mercury catalysts. The method comprises the following steps: uniformly mixing a coal prepared waste mercury catalyst with ammonia water to obtain a mixture A; under ultrasonic conditions, carrying out leaching reaction on the mixture A for 20 to 240 minutes, filtering and drying; carrying out microwave drying on the obtained product under the conditions of 50 to 150 DEG C for 5 to 30 minutes; carrying out microwave heating under the conditions of 150 to 400 DEG C for 5 to 120 minutes to obtain a mercury demercurated waste catalyst and Hg vapor; condensing and recycling the obtained Hg vapor to obtain liquid pure mercury; introducing activated gas and carrying out microwave activation on the obtained mercury demercurated waste catalyst under the conditions of 500 to 800 DEG C for 10 to 100 minutes to obtain activated carbon for a regenerated mercury waste catalyst. The method disclosed by the invention has the advantages of simple overall process flow, low cost of raw materials, capability of achieving the regeneration of the activated carbon and efficient recovery of mercury, economic value and actual production significance.

The invention discloses a comprehensive utilization device for inferior coal, biomass and solid waste. The comprehensive utilization device comprises a circulating fluidized bed gasifier, a first cyclone separator, a second cyclone separator, a first discharge pipe, a second discharge pipe, a U-shaped return feeder, an M-shaped return feeder, a slagging pipe, a circulating fluidized bed boiler, a third cyclone separator, a second return pipe and a flue, wherein the upper part of the circulating fluidized bed gasifier is connected with the upper part of the first cyclone separator; the lower part of the first cyclone separator is connected with the top of the M-shaped return feeder; the top of the first cyclone separator is connected with the upper part of the second cyclone separator; the lower part of the second cyclone separator is connected with the lower part of the first discharge pipe; the M-shaped return feeder is connected with the lower part of the circulating fluidized bed gasifier; and the upper part of the circulating fluidized bed boiler is connected with the upper part of the third cyclone separator. The device increases the waste utilization rate. Meanwhile, the invention further discloses a working method of the device, the waste can be efficiently utilized, and the rate of conversion is high.

The invention relates to a method for producing high-purity selenium through ultrasonic enhanced reduction, and belongs to the technical field of materials. The method comprises the following steps: carrying out cascade inert distillation on selenium oxide to obtain high-purity selenium oxide, dissolving the high-purity selenium oxide in dilute sulfuric acid to obtain a seleninic acid solution, carrying out ultrasonic enhanced reduction reaction on the seleninic acid solution, carrying out solid-liquid separation, and washing and drying the solid to obtain high-purity selenium. According to the method, local stirring is enhanced by utilizing reducibility. H generated by ultrasound and a high-temperature and high-pressure environment, a larger reduction potential is achieved, seleninic acid is reduced to generate high-purity selenium, the production cost of the high-purity selenium is low, the purity of the obtained selenium is high, and operation conditions are friendly.

The invention relates to a method for preparing a double-color foamed board based on temperature control, and belongs to the technical field of foaming. The invention provides a method for preparing a double-color foamed sheet based on temperature control, which comprises the following steps of: putting a foamed mother board into a mold cavity of a foaming mold, raising the temperature in the mold cavity to a first saturation temperature, injecting a foaming agent into the mold cavity, and dissolving the foaming agent into the foamed mother board, and after the foaming agent reaches a saturation state at the first saturation temperature in the foaming mother board, raising the temperature in the mold cavity to a second saturation temperature and keeping the second saturation temperature for a preset length of time, so that the foaming mother board forms a temperature gradient in the thickness direction, and after the temperature gradient is formed, releasing the pressure in the mold cavity to the environmental pressure, so that the foaming mother board expands and foams. According to the method, a temperature gradient is formed in the thickness direction of a foaming mother board by controlling the temperature in a mold cavity, so that the foaming mother board forms a melt strength difference in a foaming environment, and finally chromatic aberration is formed.

The invention relates to the field of vanadium metallurgy, in particular to a method for deeply extracting vanadium by utilizing vanadium extraction tailings, which specifically comprises the following steps: grinding the vanadium extraction tailings, adding a carbonaceous reducing agent and a sodium salt additive, reacting at 600-750 DEG C for 1-5 hours, leaching after the reaction is finished, and carrying out solid-liquid separation to obtain a vanadium-containing solution; the carbonaceous reducing agent is at least one of semi-coke or coke, and the sodium salt additive is at least one of sodium vanadate or sodium chloride. According to the method, deep vanadium extraction of the vanadium extraction tailings is achieved at the temperature of 600-750 DEG C, valuable elements in the vanadium extraction tailings are recycled, the obtained leaching residues can be directly used for blast furnace ore blending ironmaking, and the obtained vanadium-containing solution can be used for vanadium crystallization. Meanwhile, process equipment is simple and easy to operate, the whole process flow is in closed cycle, clean and environmentally friendly, and good economic benefits and application prospects are achieved.

The invention relates to a method for simultaneously removing various impurity ions in a zinc hydrometallurgy waste electrolyte, and belongs to the field of nonferrous metallurgy. The zinc hydrometallurgy waste electrolyte is precooled through a heat exchanger, then the precooled solution is added to an impurity removal reaction kettle provided with a stirring device to be subjected to heat exchange and cooled to subzero 15 DEG C-0 DEG C, seed crystals are added in the cooling process for reaction for 20-60 min, impurity components such as lead, calcium, silicon, fluorine, antimony and the like in the solution are precipitated out in the form of a solid crystal product, after the reaction ends, the solid product containing the impurity components is quickly separated, and the electrolyte without impurities is obtained. According to the method, the impurities such as lead, calcium, silicon, fluorine, antimony and the like are simultaneously and directly separated from the waste electrolyte containing high-concentration sulfuric acid on the premise that main components of the zinc hydrometallurgy waste electrolyte are not changed, the electrolyte without the impurities meets the requirement of zinc electrolytic deposition impurity concentration, and the method has the advantages of short technological process, simplicity in operation, low reagent consumption, high impurity ion removal efficiency and the like.

The invention discloses an intelligent 3D shoe customizing machine and a working method thereof. A user freely selects all kinds of pictures or graphics drawn by the user, the pictures or graphics canbe rapidly printed on shoes in a sprayed mode, and therefore personalized requirements can be met better for the user. In addition, the user can create or edit favorable patterns through a mobile phone or a computer to achieve the customizing function for the shoe patterns remotely; the patterns can be displayed on the shoes in a three-dimensional mode. The user can user existing shoes or adopt shoes matched with a system for personalized customization, in this way, selective space is larger, and the speed is higher during pattern customization. Then, the intelligent 3D shoe customizing machine is short in customizing time and safe, and clean and environmentally friendly in the whole process, and the user further can watch the whole working process through a vision window, so that the experiencing effect is better.