951 results about "Spent acid" patented technology

The invention discloses a method for extracting valuable metals from black powder of waste lithium ion batteries, and belongs to the technical field of recycling of waste lithium ion batteries. According to the method, valuable metals are extracted from the waste lithium ion battery black powder by adopting low-temperature roasting and water leaching, the waste lithium ion battery black powder is taken as a raw material, sulfamic acid is taken as a roasting agent, the waste lithium ion battery is pretreated, and roasting for carbon removal, metal extraction and water leaching are performed in sequence, so that the valuable metals are obtained. And leaching liquid and leaching residues containing two or more elements of lithium, nickel, cobalt, manganese, iron and aluminum are obtained and are used for further purification and recovery of valuable metals. According to the method provided by the invention, the influence of aluminum dissolution on recovery of other metals is reduced, the use of hydrogen peroxide is avoided, the process flow is shortened, the process cost is greatly reduced, the roasting and water leaching processes cannot corrode equipment, and the whole process cannot generate waste acid to cause secondary pollution.

The invention relates to a preparation method of a nanofiltration membrane, the nanofiltration membrane prepared by the preparation method and application of the nanofiltration membrane. The method comprises the following steps: preparing a membrane casting solution, curing the membrane casting solution on a support material to form a base membrane, and the membrane casting solution comprises a polymer and a solvent; the base membrane is in contact with a first phase solution and a second phase solution in sequence, the first phase solution comprises a first phase monomer, an adsorbent A, an active agent B and an acid-binding agent C, and the second phase solution comprises a second phase monomer and a cross-linking agent D; and post-processing. The nanofiltration membrane disclosed by the invention has excellent tolerance to high-concentration strong oxidizing acid or mixed acid, still keeps high flux and high salt rejection rate even after being soaked in the high-concentration strong oxidizing acid or mixed acid for a long time, can stably operate for a long time under high pressure, and has high flux and high salt rejection rate at the same time; the method can be effectively applied to the fields of waste acid treatment in the titanium dioxide production process, extraction and separation of lithium battery raw materials, mineral product smelting metal ion and acid recovery and the like for filtration and / or separation.

The invention discloses a method for recovering mixed acid waste liquid containing hydrofluoric acid, which comprises the following steps: reacting raw materials with sodium salt or potassium salt, and filtering to obtain filtrate; the raw material is mixed acid waste liquid containing hydrofluoric acid; feeding the filtrate into a diffusion dialysis device for treatment, wherein the diffusion dialysis device comprises a homogeneous anion exchange membrane; the recovery liquid obtained through treatment of the diffusion dialysis device is fed into a membrane separation device, the membrane material of the membrane separation device is an acid-resistant metal ion removal membrane, and the recovered mixed acid is obtained on the permeation side of the membrane separation device. According to the method, impurities and metal ions in the low-concentration waste acid solution can be effectively removed, the product reaches the electronic-grade recycling standard, the resource recycling rate is increased, the technological process is simple, energy consumption is low, and the method is suitable for industrial application and popularization.

The invention relates to an alkaline activated carbon multi-stage synergistic potassium removal method, and belongs to the technical field of activated carbon materials. According to the method, a four-step synergistic process of water washing, acid pickling, ion exchange and nitrogen calcination is adopted, and a waste acid recycling closed-loop system is combined. The deep removal of residual potassium is realized through the synergistic effect of countercurrent water washing, pH (Potential of Hydrogen) staged regulation and control acid washing, deep potassium removal by ion exchange resin and nitrogen protection calcination, and meanwhile, the high specific surface area is maintained; the pickling waste liquid is neutralized, concentrated and crystallized to be converted into agricultural potash fertilizer, and mother liquid is recycled to form green circulation.

The invention belongs to the technical field of resource regeneration, and particularly relates to a method for recycling hydrochloric acid and germanium through direct two-stage distillation after germanium chlorination distillation, which comprises germanium chlorination distillation, first-stage positive pressure acid steaming, second-stage negative pressure acid steaming and kettle stopping and slag liquid discharging. According to the invention, two-stage acid distillation is directly carried out in the original production equipment system after germanium chlorination distillation, so that the innovation of integrated continuous production of germanium chlorination distillation and acid distillation in the same equipment system is realized, the process is more energy-saving and economic, the operation is simpler and more convenient, the equipment utilization rate is higher, and the environment is more friendly; the recycling rate of hydrochloric acid is up to 60% or above; a one-stage positive-pressure acid steaming process is adopted, high-concentration hydrochloric acid with the HCl molar concentration larger than or equal to 9.5 mol / L is regenerated and can be directly returned to germanium chlorination distillation for use, and synchronous limit recovery of residual germanium in germanium chlorination distillation residues is achieved; therefore, full recycling of hydrochloric acid and germanium in germanium chlorination distillation waste acid and waste residues is realized.

The invention relates to the technical field of acidic wastewater titrimetric analysis, and discloses an automatic sampling titrimetric analysis method based on a copper smelting acidic wastewater treatment link, which comprises the following steps: collecting waste acid to obtain a waste acid sample; carrying out titration treatment on the waste acid sample to obtain a waste acid sample image after the titration reaction is finished, and carrying out sediment outline extraction on the waste acid sample image to generate sediment coagulation complexity; according to the method, automatic sampling titration is combined with image analysis, precipitation coagulation complexity and arsenic specific hue separation degree are extracted, a precipitation effectiveness index and an arsenic residue risk coefficient are generated through dynamic fusion, arsenic precipitates and other precipitates in similar forms are accurately distinguished by utilizing precipitate contour features and arsenic specific hue in an HSV color space, and the arsenic content is accurately determined. The method has the advantages that spectral signal superposition interference is avoided, and the arsenic residual state can be accurately reflected, so that whether arsenic removal is qualified or not is reliably judged, the accuracy and safety of waste acid treatment are improved, and the quality of water reuse is guaranteed.

The invention discloses an arsenic removal method for purifying waste acid, and belongs to the technical field of sulfuric acid preparation. The method comprises the following steps: settling wastewater, and carrying out filter pressing on slurry through a first filter press; in the first-stage reaction tank, the waste acid reacts with a desulfurizing agent from a sodium hydrosulfide preparation tank, and after the reaction is completed, the waste acid is sent to a first-stage FBL filter to be filtered; in the second-stage reaction tank, the waste acid reacts with a desulfurizing agent from the sodium hydrosulfide preparation tank, and after the reaction is completed, the waste acid is sent to a second-stage FBL filter to be filtered; the filtrate of the second-stage FBL filter is sent to a dynamic wave scrubber for recycling; a flocculating agent is added into the first-stage FBL filter and the second-stage FBL filter; tail gas of the first-stage reaction tank, the first-stage FBL filter, the second-stage reaction tank, the first-stage FBL filter and the sodium hydrosulfide preparation tank is sent to a spray tower, washing liquid containing sodium hydrosulfide and sodium sulfide in the spray tower is sent to the sodium hydrosulfide preparation tank, and sodium hydrosulfide solids are added into the sodium hydrosulfide preparation tank.

The utility model discloses a waste acid concentration and recovery device, which relates to the technical field of waste acid recovery, and comprises a flocculation barrel and a heating barrel, and further comprises a disturbance impurity removal unit and a transfer filtering unit which are arranged between the flocculation barrel and the heating barrel, the disturbance impurity removal unit comprises a collection hopper, an impurity removal vertical pipe, a rotating rod, a driving motor, a disturbance transverse plate and a spiral blade; the adjusting and filtering unit comprises a circular brush plate, a servo motor, a screw rod, a flocculating agent input pipe and a circular filter plate. In the utility model, the disturbance transverse plate fixedly arranged on the peripheral surface of the rotating rod can disturb and stir waste acid and a flocculating agent, flocculate is extruded by the circular filter plate and then is gathered through the aggregate bin, and when the flocculate is removed, a pipe plug on the impurity removal vertical pipe is taken down, so that the waste acid and the flocculating agent can be removed. And the spiral blade wound on the peripheral surface of the rotating rod can push and guide out the gathered flocculate on the impurity removal vertical pipe to complete removal, so that the flocculate is smoothly discharged and guided out, and the subsequent treatment effect is ensured.

The invention belongs to the technical field of waste etching liquid recycling and reusing, and discloses a method for purifying and regenerating phosphoric acid from waste phosphoric acid etching liquid and regenerated phosphoric acid, and the method comprises the following steps: adding water into the waste phosphoric acid etching liquid for dilution; filtering the diluted waste phosphoric acid etching solution, adding a fluorine-containing inorganic compound as an additive into the filtered waste phosphoric acid etching solution, and carrying out a stirring reaction to obtain silicon tetrafluoride gas and a reacted phosphoric acid aqueous solution; and evaporating and concentrating the phosphoric acid aqueous solution to obtain electronic-grade regenerated phosphoric acid and industrial-grade regenerated phosphoric acid. According to the method for regenerating and purifying phosphoric acid, silicon-containing compound impurities in the waste phosphoric acid etching liquid can be removed by using the fluorine-containing inorganic compound, so that electronic-grade and industrial-grade regenerated phosphoric acid products are obtained.

The invention relates to the field of sewage treatment equipment, in particular to an efficient waste acid and sewage treatment device in copper smelting engineering, which comprises a sewage treatment barrel, the sewage treatment barrel comprises a barrel body, an inner barrel is rotatably connected to the middle upper part in the barrel body, and uniformly distributed through holes II are uniformly formed in the middle upper part of the periphery of the inner barrel; a first limiting ring is fixedly connected to the upper portion of the periphery of the second through hole, a second limiting ring is fixedly connected to the lower portion of the periphery of the second through hole, limiting openings are formed in one side of the first limiting ring and one side of the second limiting ring, an outer barrel is rotationally connected to the middle lower portion of the periphery of the inner barrel, and a first limiting block is fixedly connected to the upper portion of one side of the periphery of the outer barrel. According to the sewage treatment barrel disclosed by the invention, the switching between a working area and a stopping area is realized, so that people can replace a reverse osmosis membrane at the original working area through an inspection opening while the work of the sewage treatment barrel is not influenced.

The invention provides a resource utilization method of iron-aluminum-chromium waste acid, and belongs to the field of waste acid resource treatment. According to the hydrochloric acid type iron-aluminum-chromium waste acid, firstly, high-valence metal in the waste acid is reduced through iron powder, the acidity of a system is reduced, and the iron content is increased; secondly, high-efficiency separation of iron, aluminum and chromium is realized by accurately controlling the sodium phosphate amount, the pH value, the reaction temperature and the stirring rotating speed; and then, oxidizing an iron solution obtained by solid-liquid separation to prepare ferric chloride, and carrying out hydrothermal crystallization on aluminum phosphate and chromium phosphate precipitates to prepare chromium-containing aluminum phosphate which can be used as a catalyst. The method realizes thorough step-by-step separation of metals in the iron-chromium-aluminum hydrochloric acid type waste acid, realizes resource utilization, is free of waste gas and waste residues in the process, meets the green and environment-friendly requirements, and has remarkable environmental and social benefits.

The utility model discloses a waste acid buffer tank for a methyl methacrylate device, which comprises a support and a buffer tank, the buffer tank is arranged at the top end of the support, and the waste acid buffer tank for the methyl methacrylate device further comprises a power device fixedly arranged at the top end of the buffer tank; the cleaning component is arranged at the bottom end of the power device in a sliding manner. According to the waste acid buffer tank for the methyl methacrylate device, through cooperative work of a supporting frame, a motor and a belt, a rotating ring is driven to rotate, through cooperative work of a supporting ring, the rotating ring and a lead screw, a vertical rod is driven to move left and right, and through cooperative work of the vertical rod, a push rod and a sliding block, a push ring is driven to move left and right; through cooperative work of the push ring and the discharge port, the residual acid solution in the buffer tank is cleaned, through cooperative work of the components, the residual acid solution in the buffer tank is conveniently and rapidly cleaned, and the acid solution is prevented from corroding the buffer tank.

The invention provides a method for recovering valuable metals from sulfuric acid process titanium white waste acid through steel slag treatment. The method comprises the following steps: recovering to obtain ferrous sulfate heptahydrate crystals; s2, recovering Sc metal, and extracting the filtrate in the step S1 to obtain a first loaded organic phase and a first raffinate; the first loaded organic phase is washed with alkali liquor, and a second loaded organic phase and washing water are obtained through reverse extraction; treating the washing water to obtain titanium phosphate; back-extracting the second loaded organic phase by using alkali liquor, carrying out filter pressing to obtain crude Sc (OH) 3, and refining to obtain scandium oxide; extracting the first raffinate to obtain a third loaded organic phase and a second raffinate, pickling the third loaded organic phase, reversely extracting with ammonia water, adding phosphoric acid for reaction, and treating to obtain titanium phosphate; and steel slag is added into the second raffinate for neutralization leaching and hydrolysis vanadium precipitation, vanadium-rich slag is obtained through filtering, and then the vanadium electrolyte is prepared. According to the method, iron is separated through crystallization, scandium and titanium are separated through extraction, vanadium-rich slag is separated through neutralization and precipitation, and efficient utilization of resources is achieved.

The invention relates to the technical field of hydrometallurgy production, and particularly discloses a method for synergistically extracting gallium and scandium by coupling titanium white waste acid with vanadium extraction converter sludge, which comprises the following steps: mixing titanium white waste acid and vanadium extraction converter sludge in proportion, stirring and leaching to obtain a leaching solution; adding an extraction agent and a diluent into the leaching solution for extraction, and washing to obtain a gallium and scandium loaded organic phase; a first stripping agent is added into the loaded organic phase of gallium and scandium for stripping treatment, and a gallium stripping solution and a loaded organic phase of scandium are obtained; sequentially carrying out alkali precipitation, alkali dissolution and electrolytic treatment on the gallium reverse extraction solution to obtain crude gallium; a second stripping agent is added into the scandium-loaded organic phase for stripping treatment, and a scandium precipitation solution and an organic phase solution are obtained; and the scandium precipitation solution is filtered, washed and subjected to acid dissolution, and a scandium-containing solution is obtained. According to the method, the titanium white waste acid is effectively recycled, rare and precious metals in the vanadium extraction converter sludge are efficiently and synergistically extracted, and the method has a relatively good popularization prospect.

The invention discloses a molybdenum disulfide acid leaching purification process, relates to the technical field of molybdenum disulfide purification, and aims to solve the problems of waste acid recycling, wastewater treatment and equipment corrosion in the molybdenum disulfide purification process. The molybdenum disulfide acid leaching purification process comprises the following steps: S1, acid purification: adding a molybdenum concentrate raw material into a reaction kettle; adding reaction acid into the reaction kettle according to a certain solid-to-liquid ratio, heating the reaction kettle to react for a period of time, and cooling to dissolve impurities in the molybdenum concentrate; s2, filter pressing and cleaning: conveying the acid-washed material to a plate frame for filter pressing to form a filter cake, cleaning the filter cake with clear water for 2-4 times until the wastewater is neutral, and conveying the filter cake to the plate frame for filter pressing again; s3, repeating acid purification and filter-pressing cleaning for several times until various acids are used up in the process; and S4, drying: putting the cleaned filter cake into a drying system for drying to obtain the high-purity molybdenum disulfide with the purity of more than or equal to 99%. According to the acid leaching purification process, impurities in molybdenum disulfide are selectively dissolved, the purity of molybdenum disulfide is remarkably improved, and the industrial application requirement is met.

The utility model relates to the technical field of acid regeneration desiliconization, in particular to a waste acid desiliconization system which comprises a heat exchanger, a dissolving tank, a cooler, a reaction tank, a surface filter and a purified waste acid collecting tank which are connected in sequence, the surface filter is connected with a mixing tank, the top of the mixing tank is connected with a flocculant storage tank through a metering pump, and the bottom of the mixing tank is connected with a sludge collecting tank. According to the utility model, the reaction tank and the surface filter are alternately circulated for desiliconization, so that the desiliconization efficiency is high; the surface filter is high in filtering precision, adjustable, small in equipment size and free of site limitation, multi-stage filtering can be flexibly set according to conditions, and the requirements for iron oxide powder of different quality grades are better met; a sedimentation tank does not need to be built, and the occupied area and economic investment are reduced; a flocculating agent can be proportionally added into the mixing tank according to the sludge amount, so that the use amount of the flocculating agent is greatly reduced, and the device has a wide application prospect.

The invention discloses a continuous preparation method of sodium tanshinone IIA sulfonate based on a single-tube thin-layer liquid membrane reactor. Comprising the following steps: (1) dissolving tanshinone IIA in an organic solvent as a feed liquid; (2) reacting gas-phase sulfur dioxide with air, and cooling to obtain sulfur trioxide mixed gas; (3) enabling the feed liquid and sulfur trioxide mixed gas to enter a single-tube thin-layer liquid membrane reactor in a parallel flow or reverse flow manner, and carrying out continuous sulfonation reaction to obtain reaction liquid; and (4) adding a sodium salt aqueous solution into the reaction solution to carry out salt forming reaction, centrifuging, drying and purifying to obtain the tanshinone IIA sodium sulfonate. According to the invention, a novel method is adopted to carry out sulfonation reaction on tanshinone IIA, and sulfur trioxide is basically completely consumed after the reaction is finished, so that the generation of waste acid is greatly reduced, and the method has important significance on environmental protection and cost reduction. The green, safe, efficient and continuous preparation of the high-purity tanshinone IIA sodium sulfonate is realized.

The invention relates to a steel surface treatment pickling waste liquid recovery treatment method, and belongs to the technical field of steel pickling waste liquid treatment. The method comprises the following steps: adding hydrochloric acid into the pickling waste liquid to adjust the pH value, introducing oxygen and a catalyst, adding a modified adsorbent, stirring, evaporating and concentrating, adding a stabilizer into a concentrated solution, dropwise adding hydrochloric acid to adjust the pH value to generate polyferric chloride colloid, diluting the polyferric chloride colloid, and filtering to remove impurities to obtain a liquid polyferric chloride product. By optimizing oxidation, evaporation concentration and polymerization reaction processes, efficient recovery of waste acid is achieved, high-purity polyferric chloride is prepared, an iron oxide-carbon composite material oxidation catalyst is prepared from ferric salt and graphene, the catalytic efficiency is improved, mesoporous silica is modified by adopting sulfydryl and amino jointly, and high-purity polyferric chloride is obtained. High-selectivity adsorption on heavy metal under the low-pH condition is achieved, the pickling waste liquid generated in the steel surface treatment process is effectively treated, environmental pollution is reduced, polyferric chloride with the high additional value is recycled and generated, and cyclic utilization of resources is achieved.

The invention relates to the technical field of distillate oil refining, and discloses a vacuum distillate oil deacidification method which comprises the following steps: S10, performing deacidification treatment on vacuum distillate oil and a deacidification agent in a deacidification unit; s20, carrying out extraction separation on the obtained deacidification agent to be generated and a back extraction agent in a back extraction mixing coalescer; s30, the separated supernatant liquid is conveyed to a back extractant regeneration device for regeneration treatment; s40, the separated lower-layer liquid enters a deacidification agent regeneration device to be subjected to regeneration treatment; the deacidification unit comprises one or more deacidification mixing coalescers, each of the deacidification mixing coalescers and the back extraction mixing coalescers comprises a shell, each shell is provided with a premixing area, a coalescence separation area and a settling separation area from top to bottom, structured packing is arranged in the premixing areas, and polar fiber bundles are arranged in the coalescence separation areas; the deacidification agent contains organic amine, a cosolvent and water. The method can be used for deacidification treatment of vacuum distillate oil with high viscosity and high acid value, and is wide in application range.

The invention relates to a method for extracting vanadium by using high-calcium steel slag and titanium dioxide waste acid, and relates to the technical field of resource utilization of metallurgical chemical waste, the method comprises the following steps: crushing high-calcium steel slag to obtain high-calcium steel slag powder; mixing the high-calcium steel slag powder and the titanium white waste acid to obtain a mixture; the mixture is heated and stirred for a reaction, then solid-liquid separation is conducted, and filtrate containing vanadate is obtained; the filtrate containing vanadate is subjected to purification treatment, and purified filtrate is obtained; and the purified filtrate is purified and refined, and a vanadium product is obtained. According to the method, the high-calcium steel slag and the titanium white waste acid are comprehensively treated, so that the resource utilization of wastes is realized, the environmental pollution is reduced, the process is simple and feasible, the operability is high, additional specific equipment is not needed, and the method has a good industrial application prospect. Meanwhile, the obtained vanadium product is high in purity and can be widely applied to the fields of steel, aerospace, chemical engineering and the like.

The invention discloses a method for utilizing waste acid water, relates to the technical field of titanium dioxide production, and aims to solve the technical problems that treatment of waste acid water generated in the titanium dioxide production process in the prior art is not environment-friendly and high in cost. The method comprises the following steps: S1, collecting acidic wastewater generated in the production process of producing titanium dioxide by a sulfuric acid method, and flocculating and layering the collected acidic wastewater; s2, filtering supernatant liquid of the layered acid wastewater, and conveying the filtered supernatant liquid to a hydrolysis section; s3, taking the acid wastewater as dilution water in a hydrolysis section, and concentrating the acid wastewater; and S4, concentrating the acidic wastewater obtained in S3 again, and returning the concentrated acidic wastewater to an acidolysis section for acidolysis. According to the method, the acid wastewater generated in titanium dioxide production is used as dilution water in the hydrolysis process, so that waste acid water is circulated, raw materials are saved, the production cost is reduced, and economic benefits are increased; the waste acid water is subjected to environment-friendly treatment, and the green production concept is met.

The present invention belongs to the technical field of cathode materials for lithium-ion batteries, and specifically relates to a method for recycling waste lithium iron phosphate. The method includes first calcining waste high-carbon lithium iron phosphate powder or lithium iron phosphate electrode sheets to obtain oxidized lithium iron phosphate; then performing two times of coating-sintering on the oxidized lithium iron phosphate and carbon source substances to obtain a regenerated lithium iron phosphate / carbon composite material; wherein during the first coating-sintering, the carbon source substances include a lithium source, an iron source, a phosphorus source and a carbon source 1, and the carbon source substances in the second coating-sintering include a carbon source 2. The method of the present invention does not require acid leaching of waste materials, no waste water or waste acid is generated during the entire recycling process, it is more environmentally friendly, does not require high temperature and high pressure, has low cost, and is a method for recycling waste lithium iron phosphate suitable for large-scale production.

The invention provides a stainless steel pickling waste acid recovery device and a using method thereof.The waste acid recovery device comprises a pickling device and a recovery tower, the pickling device comprises a pickling tank and a filter pipe installed at the bottom of the pickling tank, the filter pipe is communicated with the recovery tower, the recovery tower comprises an evaporation barrel, and the evaporation barrel is fixed to the ground; comprising a combustion chamber and an evaporation chamber which are stacked from bottom to top, and gas is introduced into the combustion chamber for combustion to heat the evaporation chamber; waste acid in the pickling tank is filtered by the filter pipe and enters the evaporation chamber to be heated and evaporated; a catalysis disc, a spraying section and a cooling section are sequentially arranged above the evaporation chamber in a stacked mode, the evaporation chamber is communicated with the cooling section through a gas conveying pipe, the cooling section is communicated with the spraying section arranged below, and cooled waste acid steam enters the spraying section to be mixed with rinsing water. Waste acid steam of nitric acid and hydrofluoric acid absorbed by the rinsing water flows downwards to enter the catalytic disc for reaction. According to the waste acid recovery device provided by the invention, the structure is simplified, and the waste acid recovery efficiency and recovery rate are improved.

The invention provides a preparation method of nano indium tin oxide powder, and belongs to the technical field of preparation of electronic ceramic transparent oxide functional inorganic materials. The preparation method comprises the following steps: in an oxygen-containing environment, performing electric arc gasification on an indium tin metal melt, and oxidizing metal steam generated by the electric arc gasification to obtain the nano indium tin oxide powder, the current applied for generating the electric arc is 500 to 1200 A, and the voltage is 50 to 120 V. The preparation method provided by the invention is simple, the oxidation reaction time is short, no exhaust gas is discharged, and meanwhile, the problems of wastewater and waste acid discharge and difficult impurity removal caused by addition of strong acid are avoided. The preparation method provided by the invention can realize continuous production and is high in production efficiency; and the particle size D50 of the prepared nano indium tin oxide powder can be kept to be less than 0.5 mu m and D90 is less than 1 mu m.

Disclosed in the present invention is a filter mechanism for a waste acid from flat glass thinning etching. The filter mechanism comprises a filter shell. The filter shell comprises an upper cylinder body, a rotating part, and a lower cylinder body, wherein a feeding port is formed at the top of the upper cylinder body, and the rotating part comprises a bearing cylinder, a plurality of tubes, and a driving part; the bearing cylinder is rotationally connected to a lower end of the upper cylinder body and is communicated with the plurality of tubes on the bearing cylinder by means of a liquid outlet formed inside the upper cylinder body; the lower cylinder body is arranged at a lower end of the bearing cylinder, and the driving part for driving the bearing cylinder to rotate is arranged on the lower cylinder body; and a filter member is arranged in the upper cylinder body, and a guide cylinder is arranged on an inner wall of the upper cylinder body. The technical problems in the prior art of a relatively poor filtering effect for a waste acid generated during glass processing and the need to stop the operation of the entire device when replacing some parts of a filter mechanism, which inadvertently reduces the filtering efficiency of the filter mechanism, are solved.

The utility model relates to a device for recovering magnesium salt tablets from industrial magnesium salt-containing wastewater, which is characterized in that magnesium salt in industrial waste acid is recovered by adopting an evaporation mode, after the magnesium salt-containing wastewater is filtered and precipitated, a supernatant solution enters an evaporation system to be evaporated and concentrated, a concentrated solution is recovered, cooling and flaking are carried out, and flaked magnesium salt is collected. The evaporation system comprises an evaporator and a condenser. The evaporation system increases the evaporation speed by enhancing evaporation; through the characteristic of normal-pressure evaporation, the problems that the boiling point is increased due to the fact that the solubility of the solution is increased, and energy consumption is increased due to the fact that the requirement for the quality of a heat source is improved in a traditional boiling evaporation process link and the evaporation system works unstably are solved. Compared with the prior art, the energy utilization efficiency is improved, the energy consumption is reduced, the operation stability of the system is improved, and the risk that the evaporator is scaled and blocked is avoided.

The invention discloses a waste sulfuric acid treatment method and device, the device comprises a sintered filter element filter, a fine filtration coalescer, an adsorption tank and a membrane separator which are connected in sequence, and the fine filtration coalescer adopts a ceramic membrane tube or a polytetrafluoroethylene membrane tube or a silicon carbide lining membrane tube as a filter material; an adsorption material in the adsorption tank is one or a combined adsorption material of more than two of activated carbon, a modified molecular sieve, a metal organic framework material and a nano adsorption material; and the membrane separation system adopts one or a combined membrane of more than two of an ultrafiltration membrane, a reverse osmosis membrane and an electrodialysis membrane. The alkylation waste acid regeneration process can be simplified, the occupied area of the device is saved, the engineering investment is reduced, and the operation cost is greatly reduced compared with that of an existing process technology; according to the method, a physical separation means is adopted, organic polymeric oil, dissolved organic matters, dissolved salts and other impurities in the alkylated waste sulfuric acid can be effectively removed without decomposing and reconstructing the waste sulfuric acid, and the concentrated sulfuric acid after concentration completely meets the production requirements of an alkylation device.

The invention provides a method for preparing sodium sulfate by using copper smelting slag slow-cooling circulating water and drying equipment, and the method comprises the following steps: S1, collecting arsenic-containing waste acid generated in a copper smelting process, and carrying out vulcanization and neutralization treatment processes to enable various indexes in the waste acid to reach a reuse standard; s2, the waste acid obtained in the step S1 is placed in a storage container, and solid particles and impurities in the waste acid are removed; s3, heating and evaporating the waste acid obtained in the step S2, and concentrating until no mother liquor exists; and S4, washing with a small amount of distilled water, carrying out centrifugal spin-drying, and drying in drying equipment to finally obtain dried sodium sulfate powder. By recovering and utilizing sodium sulfate in waste acid, reasonable utilization of resources is realized, and resource waste and environmental pollution are reduced.

The utility model relates to a wastewater treatment system which comprises an adjusting tank, a first-stage reaction unit, a second-stage reaction unit, a third-stage reaction unit and a filtering unit which are connected in sequence, wherein the adjusting tank is used for mixing evaporative crystallization mother liquor with waste acid to obtain mixed liquor; the first-stage reaction unit is used for adding lime milk into the mixed liquid for neutralization reaction to obtain first supernate; the second-stage reaction unit is used for removing chloride ions in the first supernate by using an ultrahigh lime aluminum method to obtain second supernate; the third-stage reaction unit is used for performing hardness removal treatment on the second supernate to obtain third supernate; the filtering unit is used for filtering the third supernate and then sending the filtered third supernate to the front end of the wastewater zero discharge system for retreatment. The evaporative crystallization mother liquor and the waste acid are synchronously treated by adopting the technologies of neutralization reaction, ultrahigh lime aluminum method, hardness removal, filtration and the like, so that components such as COD (Chemical Oxygen Demand), sulfate radicals, chloride ions and the like in the evaporative crystallization mother liquor and the waste acid can be removed in a sludge form.

The invention discloses a method for preparing battery-grade iron phosphate from wet-process crude phosphoric acid and raffinate acid, which comprises the following steps of: mixing and leaching an iron source and wet-process crude phosphoric acid or wet-process crude phosphoric acid and raffinate acid to obtain ferrous dihydrogen phosphate containing metal impurities, ferrous phosphate leachate I and leaching residue; carrying out pH regulation and control on the leachate I to precipitate and remove aluminum in the form of aluminum phosphate, and carrying out multi-stage precipitation to remove aluminum until the content of aluminum ions is lower than 500ppm, so as to obtain leachate II; hydrofluoric acid is added into the leachate II, the pH value is adjusted to 1.6-2.5 with refined phosphoric acid, Al ions are precipitated, and leachate III is obtained after solid-liquid separation; an oxidizing agent is added into the leachate III for a precipitation reaction, and iron phosphate dihydrate and a phosphoric acid solution are obtained; and calcining the iron phosphate dihydrate to obtain the iron phosphate dihydrate. Crude phosphoric acid and raffinate acid can be directly utilized to produce battery-grade iron phosphate, the process is simple, compared with a traditional iron-method iron phosphate production process, the raw material cost is greatly reduced, generation of waste water and waste acid in the refining process is avoided, and the method is suitable for industrial production.