496results about How to "High recycling value" patented technology

The invention relates to a recycling processing method for a stainless steel processing process wastewater grading precipitation, which comprises the following steps: (1) deslagging and homogenizing acid-washing residual liquid and washing wastewater; (2) adjusting the pH to 4.0-5.5 by a CaCO3 filter bed to generate CaF2; (3) oxidizing Fe<2+> into Fe<3+> by an oxidizing agent to generate sedimentsof Fe(OH)2 and Fe(OH)3; after the Fe(OH)2 , the Fe(OH)3 and the CaF2 are deposited, recovering; (4) carrying out three-level alkali adding coagulation precipitation on the supernatant liquid of an oxidation precipitation pool; adjusting the pH to obtain a Cr sediment in the first-level alkali adding coagulation precipitation; acquiring a Ni sediment in the second-level alkali adding coagulation precipitation; carrying out the third-level alkali adding coagulation precipitation and adding a flocculating agent to remove residual heavy metal ions so that discharge water reaches the standard, wherein the alkali added into a grading reaction precipitation pool is NaOH, Ca(OH)2, CaO or Na2 CO3; (5) regulating the pH of the discharge water of the grading reaction precipitation pool to 6.0-8.0; discharging 0-20 percent of wastewater and filtering residual F<-> and suspended matters of 80-100 percent of wastewater to reach the standard and recycle; and (6) recycling the Cr-Ni metal or the compound thereof from the Cr sediment and the Ni sediment acquired by a third-level coagulation precipitation pool by a recycling device.

The invention relates to a recycling processing method for wastewater produced by processing stainless steel, which comprises the following steps: after acid-washing residual liquid and washing wastewater are carried out wastewater deslagging, homogenizing; pumping into a CaCO3 filter bed to adjust the pH to 4.0-5.5 and removing F<->; adding an oxidizing agent into discharge water, oxidizing Fe<2+> into Fe<3+> and generating Fe(OH)2 and Fe(OH)3; after the Fe(OH)2, the Fe(OH)3 and CaF2 are deposited, recovering; adopting two-level coagulating sedimentation on supernatant liquid; adding alkali to adjust the pH to 8.0-9.5 in the first level; continuously adding the alkali to adjust the pH to 10.0-11.0 in the second level and adding CaCl2 and a flocculating agent to deposit sludge containing chromium and nickel; adding acid liquor into the discharge water to adjust the pH to 6.0-9.0 and filtering residual F<-> and suspended matters to reach the standard and recover; carrying out dehydration separation on the sludge containing ferrum and the sludge containing chromium and nickel; adding strong acid into the sludge containing chromium and nickel to dissolve; adopting two-level alkali adding coagulating sedimentation on the wastewater of a dissolving pool to obtain a Cr(OH)3 sediment and a Ni(OH)2 sediment or a NiCO3 sediment; carrying out sludge-water separation and recovering to obtain chromium and nickel metal or the compound thereof; and using supernatant liquid and the discharge water of a press filter for homogenization.

The invention discloses a household garbage fine separation and complete recycling comprehensive treatment process and relates to a process for treating household garbage. According to the household garbage fine separation and complete recycling comprehensive treatment process, urban household garbage which is collected in a centralized manner can be recycled in a plurality of manners and enters all recycling systems, a plurality of products are produced and returned to the urban for use, and recycling, maximum reduction and harmlessness of the household garbage are truly and completely achieved. The household garbage fine separation and complete recycling comprehensive treatment process comprises following steps of bag breaking, leaching and material storage of the household garbage; separating, wherein waste plastic, unrecyclable combustible materials, organic matter, inert inorganic matter and ferromagnetic matter are separated out; treatment of the separated matter; collecting and treating of garbage leachate and waste water; collecting and treating of waste gas or bad smell; and treating of the noise.

A waste power lithium battery automated splitting all-components clean recovery method is characterized by comprising the following steps: conveying discharged waste single power batteries into a shell cutting device through a feeding conveyer, cutting off end caps of the single batteries, pushing out battery cells, cutting the battery cells into blocks through a battery cell cutting device, recovering shell materials, simultaneously sending the battery cell blocks into an organic solvent and rinsing, collecting the solvent and concentrating and recovering an electrolyte, distilling the solvent for recycling, drying the battery cell block materials, sorting out plastic diaphragms and positive and negative plates by an eddy current separation method, sorting out positive plates and negative plates continuously through a magnetic separation method, immersing positive plates with water and drying and carrying out material separation and sorting by a rolling mill screening method, recovering to obtain clean cathode material powder and cathode aluminium foils, and separating and sorting negative plates by the same method.

The invention relates to a closed circulating and recycling method of a waste lead-acid accumulator, and is used for solving the problem of low recovery efficiency, severe pollution and the like in the existing recycling aspect of the waste lead-acid accumulator due to lagging processing equipment, technical process production scale and the like. The method comprises the steps of: separating materials in the waste accumulator by crushing, oscillating screen sorting, magnetic separation, hydraulic sorting, vortex sorting and other methods, then carrying out desulfurization and pressure filtration treatment on obtained lead mud, then sequentially conveying obtained dried desulfurized lead mud and lead grid to a convertor and a refining kettle for smelting and refining, finally processing the refined molten lead into lead powder, lead grid or lead ingot, and storing for later use or selling as a finished product. The method has the advantages that the mechanical automation degree is high, pollution-free measures are adopted, the materials are thoroughly separated, the recovery rates of the materials are greatly improved, the total recovery rate of lead achieves 98%, the recovery rateof plastic achieves 95%, and the comprehensive utilization rate of resources achieves 98%.

The invention discloses a process for co-production of liquefied synthesis gas, pure hydrogen and methanol from coke-oven gas. The process comprises the steps of: (a) firstly, purifying and compressing the coke-oven gas, then enabling the gas after being subjected to the heat exchange of a heat exchange device to enter into a methanol synthesis tower for a methanol synthesis catalytic reaction, exchanging heat of discharged gas by a heat exchanger, and enabling the gas after being cooled by a cooler to enter into a methanol separator so as to obtain crude methanol; and (b) preparing refined methanol, enabling the gas to enter into a methanol washing machine, washing away trace methanol in the gas with water, enabling partial gas after being compressed by a circular compressor to turn back to the heat exchanger for methanol synthesis and enabling other gas to enter into a heat exchanger for methanation, enabling the gas to enter into a pre-heater after heat energy is recycled, adding a small amount of aqueous vapor in the pre-heater and then enabling the gas to enter into a methanation reaction furnace. According to the process disclosed by the invention, content of oxycarbide in the gas is reduced and the methanol product is obtained through resource recycling, residual small amount of oxycarbide is removed thoroughly and hydrogen resource with high value is recycled, and the obtained liquefied natural gas is convenient to transport.

A method of operating an iron redox flow battery system may comprise fluidly coupling a plating electrode of an iron redox flow battery cell to a plating electrolyte; fluidly coupling a redox electrode of the iron redox flow battery cell to a redox electrolyte; fluidly coupling a ductile plating additive to one or both of the plating electrolyte and the redox electrolyte; and increasing an amount of the ductile plating additive to the plating electrolyte in response to an increase in the plating stress at the plating electrode. In this way, ductile Fe can be plated on the negative electrode, and the performance, reliability and efficiency of the iron redox flow battery can be maintained. In addition, iron can be more rapidly produced and plated at the plating electrode, thereby achieving a higher charging rate for all iron flow batteries.

The invention discloses a method for recycling overhauling slag waste cathode carbon blocks of an electrolytic bath. The method is characterized by comprising the following steps: separating the overhauling slag of the electrolytic bath to obtain waste cathode carbon blocks; respectively conducting water leaching to the separated waste cathode carbon blocks, conducting secondary smashing and water leaching to the separated blocks, recycling the separated blocks, grinding and floating the rest powder, and separating carbon powder from the rest powder. According to the method, fluoride salt difficultly removed from the overhauling slag waste cathode carbon blocks of the electrolytic bath can be separated, the recycling value of the overhauling slag waste cathode carbon blocks of the electrolytic bath can be improved, the overhauling slag waste cathode carbon blocks of the electrolytic bath can be changed into valuables, the overhauling slag waste cathode carbon blocks of the electrolytic bath can be economically recycled without pollution, thereby fundamentally removing the hidden pollution hazard.

The invention relates to a method for recovering rare earth in neodymium-iron-boron waste by high-temperature and high-pressure leaching. The neodymium-iron-boron waste is subjected to oxidation roasting, hydrochloric acid high-temperature and high-pressure leaching, and oxidation and impurity removal purification on Fe2+ in a leachate so as to obtain a rare-earth chloride leachate; and the rare-earth chloride leachate can be used as a subsequent process and a product raw material, rare earth is obtained through extraction and separation, rare earth carbonate is prepared through precipitation,or rare earth oxide is prepared through precipitation-roasting. According to the method, a closed high-pressure reaction kettle is adopted as leaching equipment, so that the dynamic condition of theleaching process is excellent, the requirement for the particle size of the leached raw materials is low, a large amount of dust generated by the fine grinding process of the raw materials is avoided,the leaching rate of rare earth in the leaching process is high, the utilization rate of hydrochloric acid is high, no acid gas is discharged, energy is saved, and the environment is protected; and in addition, the method has the advantages of being short in process flow, simple in process conditions and low in recovery cost, and the method has considerable economic, social and environmental protection benefits for large-scale recovery of the neodymium-iron-boron waste.

The invention relates to a new cycle technique for preparing white carbon black, comprising the following steps: 1) a water glass solution reacts with an ammonium hydrogen carbonate solution or solid ammonium hydrogen carbonate in the condition of the temperature of 30 to 50 DEG C, the white carbon black is obtained and ammonia escapes simultaneously; 2) the ammonia escaped from the step 1) is mixed with CO2 gas produced in the process of the preparation of the water glass solution and the obtained mixture is absorbed by water to obtain the ammonium hydrogen carbonate; 3) the white carbon black produced by reaction is filtered under the condition of vacuum to obtain a mother liquid A and a filter cake A, the mother liquid A is recovered and the filter cake A is washed, dried and crushed so as to obtain the white carbon black. The invention 1) solves the effective recovery of by-products in the production process, is used for self-production, improves the utilization value of materials, without three wastes discharge in the production process, and has high material utilization rate, good effect of discharge reduction and stable and reliable quality of products; 2) recovery of sodium bicarbonate is carried out after the mass concentration is increased by the evaporation in vacuum at low temperature, thus reducing the usage of organic solvent.

The invention relates to a preparation method of a reed-based biochar adsorption material. The preparation method is technically characterized by comprising the following steps of cleaning the reed stalk, drying and crushing; soaking the crushed reed stalk into a KOH (potassium hydroxide) solution to activate, and drying; putting the dried crushed reed stalk into an atmosphere furnace, and performing oxygen-free high-temperature cracking under the nitrogen or inert gas protection atmosphere; after high-temperature cracking treatment, cooling to room temperature, and cleaning the cracked material to be neutral by an acid solution, so as to prepare the reed-based biochar adsorption material. The preparation method has the advantages that the problems of pollution to environment and waste ofresources due to irresponsible disposal of the wetland plant wastes are solved; compared with the prior art, the specific surface area is large, the pollutant adsorption ability is strong, the environment-friendly value is greatly increased, and the resource utilization of the wastes is realized.

The invention discloses a method for preparing ammonia water and calcium chloride solution through the decomposition recovery of ammonium chloride waste liquor. The method comprises the following steps: the waste liquor is pretreated, and ammonium chloride and calcium oxide or calcium hydroxide powder is added into the pretreated ammonium chloride waste liquor; ammonia is distilled from the treated ammonium chloride waste liquor and is transferred into an ammonia absorption tower after being condensed, and a reaction liquid flows out from the bottom of a distillation tower; ammonia is absorbed from the condensed ammonia in the absorption tower by using desalted water, and the tail gas is exhausted after residual ammonia is washed by a tail gas washing tower; reaction liquid out of the bottom of the distillation tower is subjected to flash vaporization for recycling the energy and then is transferred into a clarifying barrel, and the clarified calcium chloride supernatant is used as the target product. According to the invention, the method is particularly suitable for the transformation of ammonium chloride wastewater treatment technology of enterprises in the existing rare earth industry, potassium carbonate industry and baking soda industry, and is simple in process; the ammonia is recycled by using desalted water through multi-stage absorption, and the recovery rate is up to 99%; the high-concentration calcium chloride solution can be used for producing calcium chloride products and the products can be recycled so as to have better economic benefits.

The invention discloses a process for producing sodium fluosilicate by using sodium sulfate, which comprises the following steps: (1) subjecting the solution of hydrofluorosilicic acid and sodium sulfate with the mol ratio of 1:1.0 to 1.2 to reaction and crystallization; (2) adding solid sodium sulfate to the reaction solution for salt dissolution till the mass percent concentration of the sodium sulfate reaches 15 to 20%; (3) separating the sodium fluosilicate; (4) subjecting the mother solution slating liquid to a circulated process of salt dissolution and reaction. The method utilizes the water of the hydrofluorosilicic acid, saves a large part of water for the salt dissolution and reduces the production of sewage; the salt dissolution by the mother solution is to continue to add excess amount of salt so as to continue to enlarge the size of hydrofluorosilicic acid crystals and increase the precipitation quantity. The utilization rate of the hydrofluorosilicic acid can reach to above 96%, which is far higher than the level of around 80% by prior solution method.

The invention relates to a standardized design construction method of a flexible compound fabricated recoverable rectangular working well supporting structure. The method comprises the following stepsthat (1) construction of minisize supporting piles is carried out; (2) construction of pile top crown beams; (3) a rectangular working well is excavated, panels and waist beams are installed, and high polymers are poured to side walls for sealing; (4) excavation is carried out layer by layer sequentially in the vertical direction, and the step (3) is carried out repeatedly till the design depth is met, that is, construction of the rectangular working well supporting structure is completed accordingly; and (5) after the supporting structure fulfills the usage function, the supporting structurerecovery work can be carried out as the backfilling work is started. Through standardized design construction of the established supporting structure system, one supporting structure can meet the construction requirement of most rectangular working wells in a region, the advantages of safety, reliability, quick and convenient construction, advanced technologies, high recoverability, superior economic indicators and the like are achieved, and the application and development prospects are considerable.

The invention provides a reusable method of decanedioic acid phenol-containing wastewater, which comprises the following steps: providing decanedioic acid mother liquid which is prepared by neutralizing and acidating and crystallizing a sebacate solution; carrying out solid-liquid separation to the mother liquid to obtain a decanedioic acid solid and first wastewater, reusing the first wastewater, for example, part of the first wastewater is recycled to be used in a neutralization step; neutralizing and extracting balance of the first wastewater, removing phenol, performing pervaporation and removing by-product which is sodium sulfate to obtain third wastewater that is recycled to be used in the neutralization step or as flushing water in a centrifugal filtration step or is biologically treated to obtain fourth wastewater satisfying the discharge standard; or laminating the decanedioic acid mother liquid to obtain lower layer dope (part A) which contains crystallized decanedioic acid and upper clear solution (part B); carrying out solid-liquid separation to the lower layer dope (part A) which contains crystallized decanedioic acid to obtain the decanedioic acid solid and the first wastewater; carrying out solid-liquid separation to the upper clear solution (part B) to obtain the decanedioic acid solid and second wastewater; and reusing the first wastewater and the second wastewater.

The invention discloses a method for preparing silk protein composite cellulose fibers, which includes steps: firstly, adding degummed waste silk into LiBr solution, dissolving the waste silk to prepare silk protein solution in which silk protein accounts for 3-15%, by weight; secondly, adding the silk protein solution into sodium hydroxide solution with cellulose sulfonate to obtain blended solution of silk protein and cellulose, wherein blended silk protein solution accounts for 5-50% of that of the sodium hydroxide with cellulose sulfonate by weight; and thirdly, spinning the blended solution by coagulating bath and obtaining the silk protein composite cellulose fibers by post-processing. By the method, recovery value of the waste silk is improved greatly, special effects of whitening and skin caring of the silk protein composite cellulose fibers can be realized, and the fibers are smooth and soft to touch as silk, and have the skin caring and whitening effects that the effects of protein powder fibers or blended fibers of protein powder and cellulose solution cannot match.

The invention relates to a medical garbage sorting harmless treatment and a combustible recycling method. The pre-treatment and separating of the medical garbage comprise the following steps: (1) garbage collecting; (2) sorting; (3) crushing; (4) radiation sterilization; (5) separating: according to the specific weight and magnetism of materials, separating the medical garbage into four types: lighter materials, heavier materials, magnetic materials and residual materials; recycling the lighter materials, the heavier materials and magnetic materials and sending the residual materials in a special garbage incinerator to burn. When recycling the lighter materials, the materials are crushed and mixed with smoke coal powder in 100:30-40 ratio, then proper binding agent and other additives are added, after adding water, the mixture is pressed and molded by a former and dried by air to form bulk fuel. The invention facilitates recycling of physical resources and reduces energy consumption and air pollution.