72 results about "Spent acid" patented technology

The application discloses a continuous production process and equipment for a trifluoromethylbenzene tower, and belongs to the field of organic fluorine chemistry. The production process comprises the following steps: S1: continuously feeding trichloromethylbenzene and hydrogen fluoride into a tower reactor connected with a heat exchanger circulating cooling system in a reverse direction, so that a three-stage continuous fluorination reaction occurs in the tower reactor to obtain crude trifluoromethylbenzene, and unreacted hydrogen fluoride is separated into liquid at the top of the tower and then flows back into the tower reactor; S2: the crude trifluoromethylbenzene obtained in the reaction is subjected to nitrogen bubbling in a bubble tower, and then is continuously distilled in a rectifying tower to obtain finished trifluoromethylbenzene; and S3: byproduct hydrogen chloride generated in the fluorination reaction is introduced into a hydrochloric acid tank to obtain hydrochloric acid, and the content of hydrofluoric acid in the hydrochloric acid is less than 1000 ppm. The method can greatly improve the utilization rate of raw material hydrogen fluoride, improve the purity of byproduct hydrochloric acid, reduce the generation amount of waste acid, avoid the sharp change of pressure in the reaction process, and realize large-scale, continuous, stable and safe production of trifluoromethylbenzene.

This invention discloses a complete process for preparing nitrobenzene using a microchannel reactor, belonging to the field of nitrobenzene synthesis. The complete process includes mixed acid, microchannel nitration reaction, intermediate product cooling and stratification followed by water and alkali washing, crude product distillation, waste acid recovery, and wastewater treatment. Compared with existing nitrobenzene synthesis technologies, this invention has high mass transfer efficiency, significantly shortens the nitration reaction time, greatly improves production efficiency, enhances reaction safety, and simultaneously achieves waste acid recovery and wastewater treatment, ensuring safe, environmentally friendly, and stable production.

This invention discloses a waste acid recovery method based on ion exchange separation technology, belonging to the field of waste acid recovery technology. The method includes the following steps: passing a waste nitric acid solution containing aluminum and chloride ions through a cation exchange resin to adsorb aluminum ions; adding silver nitrate solution to the adsorbed waste liquid to allow silver ions to react with chloride ions to form silver chloride precipitate; filtering out the silver chloride precipitate to obtain a nitric acid solution; removing the silver chloride precipitate, using aluminum foil as a reducing agent, and adding a small amount of hydrochloric acid to reduce the silver chloride to silver powder; washing the reduced silver powder and dissolving it in nitric acid to obtain a silver nitrate solution for recycling. This waste acid recovery method based on ion exchange separation technology solves the problem of excessive total nitrogen in wastewater discharge; it also significantly reduces waste acid treatment costs and improves economic efficiency.

A kind of waste acid regeneration process process gas washing device includes power wave scrubber, spray washing circulating pump and high tank, wherein: power wave scrubber includes washing pipe and tank body, washing pipe is connected with tank body;Washing pipe upper end is equipped with air inlet and liquid inlet;Washing pipe is equipped with reverse spray port inside;Tank body top is equipped with air outlet;Tank body upper portion is equipped with coalescing internal part;Tank body middle upper portion is equipped with spray system;Tank body bottom is equipped with water outlet;Tank body water outlet is connected with spray washing circulating pump, the outlet of spray washing circulating pump is connected with high tank, reverse spray port and spray system respectively, high tank is connected with liquid inlet.The washing device of the application maximizes to improve washing efficiency, recycling washing liquid, and protects device from high temperature process gas damage, can more economically, efficiently handle waste acid regeneration process process gas.

The application provides a copper selection process of iron-containing waste residue, and comprises the following steps: adding iron powder and ammonium fluoride into titanium dioxide waste acid to obtain a titanium dioxide waste acid pre-solution after a period of reaction; S2, adding the iron-containing waste residue into the titanium dioxide waste acid pre-solution, and controlling the reaction temperature to be 20-50 DEG C; S3, after the reaction is completed, adding a nano precipitant when the pH of the solution is adjusted to 3-4.5, and adding a modified flocculating agent after a period of reaction, so that the precipitated copper is obtained after filtration and washing.

The utility model relates to a kind of multi-stirring efficient vulcanization reaction kettle, including tank body, mixer and gas pipe, the liquid outlet of the mixer is connected with the side of tank body intercommunication;The side of tank body away from mixer is equipped with liquid outlet;Tank body bottom is equipped with slag outlet;Slag outlet is equipped with slag valve;The gas pipe is set in tank body top, and one end of gas pipe is inserted into tank body, and the other end is connected with gas conveying device.The utility model can mix waste acid and vulcanizing agent fully by mixer;And hydrogen sulfide gas is delivered to tank waste acid by gas pipe, so that hydrogen sulfide gas and waste acid react, conveniently recycle hydrogen sulfide gas, reduce the consumption of sodium hydrosulfide and sodium hydroxide, reduce processing cost.

This invention provides a method for the synergistic recovery of sulfuric acid and copper and zinc from waste acid from copper strip washing, comprising the following steps: S1, waste acid pretreatment; S2, novel bipolar membrane electrodialysis separation; S3, copper-targeted precipitation separation: adding a copper-targeted precipitant to the heavy metal concentrate to form a stable precipitate, followed by filtration and washing to obtain a copper-enriched precipitate; S4, zinc sulfate preparation: adjusting the pH of the filtrate after copper precipitation separation and removing reducing impurities, then evaporating and concentrating to a solution density of 1.4-1.5 g / cm³, cooling and crystallizing, and centrifuging to obtain zinc sulfate crystals, with the mother liquor returned to the evaporation and concentration unit for recycling. This method can achieve efficient recovery and recycling of sulfuric acid, while simultaneously achieving precise separation of copper and zinc ions and the preparation of high-value products, significantly improving the resource utilization efficiency of waste acid and reducing treatment costs.

This invention discloses a method for simultaneously separating iron and gallium from acid leaching solutions of coal-based solid waste, belonging to the field of coal-based solid waste resource utilization technology. The method includes: adjusting the pH of the acid leaching solution of coal-based solid waste to obtain a pretreated leachate; subjecting the pretreated leachate to hydrothermal precipitation to obtain reaction products; and subsequently subjecting the reaction products to sedimentation treatment to obtain an aluminum-containing solution and gallium-rich iron slag. This invention achieves efficient separation of the impurity component iron and preliminary enrichment of the valuable component gallium from acid leaching solutions of coal-based solid waste simultaneously through simple hydrothermal precipitation without introducing any exogenous impurity ions. The process is simple, the operating conditions are mild, and it provides a stable and reliable technical path for the treatment of acid leaching solutions of coal-based solid waste.

This disclosure relates to the field of inorganic non-metallic materials technology, and particularly to a method for preparing highly active micro-powder and the highly active micro-powder itself. The preparation method includes the following steps: Step 1, grinding high-silicon aluminum solid waste into fine powder; Step 2, adding waste acid to the fine powder and mixing to obtain a first mixture; Step 3, adding sodium sulfate to the first mixture, stirring evenly, and aging to obtain a second mixture; Step 4, adding limestone powder to the second mixture and mixing to obtain a third mixture; Step 5, subjecting the third mixture to heat treatment, cooling, crushing, and grinding sequentially to obtain the finished product. This method uses high-silicon aluminum industrial solid waste as the main raw material, combined with industrial by-products waste acid and sodium sulfate, to prepare highly active micro-powder through simple process steps. This achieves the resource utilization of industrial solid waste and industrial by-products, solving problems such as insufficient supply of highly active micro-powder in the Panxi region, environmental pollution from industrial solid waste stockpiling, and difficulties in disposing of industrial by-products.

This utility model discloses a modular chemical waste acid and waste liquid separation and purification device, including a housing, an inlet on the top plate of the housing, and an outlet on the bottom plate of the housing. From top to bottom, a filtration and cleaning component, a waste liquid neutralization component, and a filtration and collection component are sequentially arranged within the housing cavity. Waste acid and waste liquid enter the housing through the inlet, are filtered by the filtration and cleaning component, and then enter the neutralization tank, where the waste acid and waste liquid undergo a thorough neutralization reaction with alkaline substances. After further filtration by the filtration and collection component, the waste acid and waste liquid flow out from the outlet of the housing. The filtration and cleaning component pushes impurities on the filter screen to the filtration and collection component, and the filtration and collection box can be removed and the impurities emptied. This utility model's separation and purification device can reliably separate and purify chemical waste acid and waste liquid.

The utility model relates to a reaction kettle for containing lead ferrous chloride waste acid impurity removal belongs to chemical equipment technical field. The reaction kettle aims at the problem that the effect of existing cleaning lead slag is poor and the artificial labor quantity is big, provides an improved scheme. The reaction kettle includes kettle body, feed end and blowdown end, the kettle body top is equipped with motor -driven stirring rod, is equipped with multiple groups of stirring blade auxiliary mixing outside wall. The sleeve is fixed with the scraping strip through the connecting strip. The blowdown end is provided with the blockage, and the sleeve bottom end is rotatably connected with the blockage. The scraping strip and kettle wall keep gap with rotation auxiliary reaction when mixing, and the blockage is moved down to open the blowdown end when cleaning, drives the scraping strip to descend to the kettle bottom and rotates to scrape off the lead slag. It is driven to move down through the external thread rod mechanism. The scheme makes the scraping strip avoid wearing the kettle wall in the stirring, and the sediment is scraped off automatically when discharging residue, reduces manual intervention, and improves the impurity removal efficiency.

The utility model provides an adsorption purification component for waste acid regeneration, which comprises an adsorption tower, a feed port is fixedly connected to the top of the adsorption tower, and a movable cover plug is arranged at the top of the feed port, and is characterized in that a feeding buffer is fixedly connected to the bottom of the feed port, a plurality of ceramic ball plates are fixedly connected to the inner wall of the adsorption tower, and the ceramic ball plates are fixedly connected to the inner wall of the adsorption tower. A plurality of stainless steel filter screens are fixedly connected to the inner wall of the adsorption tower, one of the stainless steel filter screens is fixedly connected to the bottom of one ceramic ball plate, the other stainless steel filter screen is fixedly connected to the top of the other ceramic ball plate, and a composite adsorbent is placed through a movable assembly by means of the structure of the movable assembly. The internal flowability and heating are ensured by utilizing the structure of the adsorbent, so that the adsorbent is in contact with waste acid in a dynamic state to realize continuous regeneration, and meanwhile, the cleaning assembly also cleans impurities adsorbed in the movable assembly along with the movement of the movable assembly to prevent the blockage condition caused by accumulation.

This invention relates to the field of industrial waste acid treatment and resource recycling technology, and particularly to a method for the resource-based treatment and recycling of pickling waste liquid from hot-rolled titanium coils. The method includes: based on the mixed waste acid liquid discharged from the acid tank, continuous measurement and recording, filtration, impurity separation, and pretreatment liquid preparation are performed to obtain a first pretreatment liquid record; then, alkali solution is added, stirred, and a first pH window is adjusted, followed by precipitation and solid-liquid separation to obtain a first supernatant record; next, alkali solution is added, stirred, and a second pH window is adjusted to obtain a first mother liquor record; finally, diffusion dialysis or selective ion exchange membrane separation is performed to obtain a first regenerated acid liquid record, which is then mixed with fresh acid liquid after concentration detection to obtain a first recycling record. This invention, through graded precipitation and a complete recording chain, achieves stepwise separation of iron and titanium components and efficient recovery and reuse of acid liquid, significantly improving the resource utilization level.

The application belongs to the technical field of water treatment, and particularly discloses an acid recovery device. The acid recovery device comprises an acid separator and acid concentration electrodialysis. The acid separator is sequentially arranged and placed by a positive charge microporous semi-permeable membrane, a negative charge fibrous filler, a positive charge microporous semi-permeable membrane, a raw material chamber separation net and a positive charge microporous semi-permeable membrane. The components arranged in this way can be arranged in multiple ways to realize more efficient treatment. Dilute acid from the acid separator enters the acid concentration electrodialysis component for treatment. The acid recovery device has the advantages of fast diffusion speed, high salt concentration of waste acid, the ability to treat waste acid with high salt concentration, high recovery rate and the like.

The application belongs to the technical field of sludge gasification residue recycling, and particularly relates to a process for recycling aluminum phosphate from sludge gasification residue, aiming to solve the problem of difficult efficient and clean recycling of phosphorus and aluminum resources in sludge gasification residue. The process comprises: mechanically crushing the sludge gasification residue to increase the specific surface area; using waste acid for wet acid leaching to dissolve phosphorus, aluminum and iron elements; after solid-liquid separation and dilution to adjust pH, using strong acid cation exchange resin to remove heavy metal ions, realizing efficient separation of phosphorus and impurities; taking the phosphorus concentration in the purified acid leaching solution as the benchmark, under the conditions of accurate control of pH, temperature and aluminum-phosphorus molar ratio, reaction to generate aluminum phosphate precipitate; and then through aging, solid-liquid separation, washing, drying and crushing, high-purity aluminum phosphate product is obtained. The application avoids phosphorus loss through waste acid cooperation with acid leaching and resin deep impurity removal, significantly improves the phosphorus leaching rate and product purity, the process flow is compact and can be continuously operated, and has economic and environmental benefits.

This invention belongs to the field of inorganic fluoride preparation technology, and relates to a method for preparing high-purity phosphorus pentafluoride gas. A phosphorus pentafluoride mixed gas is passed into dimethyl carbonate, and the mixture is sequentially heated and pressurized for reaction, cooled to precipitate, and filtered to obtain a phosphorus pentafluoride complex solid. The phosphorus pentafluoride complex solid is then sequentially washed, re-dissolved, and distilled to obtain high-purity phosphorus pentafluoride gas. Compared to traditional methods using multi-stage distillation and washing, this method can efficiently and easily remove impurities such as hydrofluoric acid and hydrogen chloride from the phosphorus pentafluoride gas, and does not generate a large amount of waste acid. The purity of the prepared gas is above 99.9%, and the gas yield is above 90%. When high-purity phosphorus pentafluoride gas is used in lithium-ion batteries, it can meet the performance requirements of lithium-ion battery electrolytes.

The utility model discloses a device for purifying acid-making flue gas generated in an acid-making process of copper smelting flue gas. The device comprises an electric precipitator, an overflow weir, a primary dynamic wave, a gas cooling tower, a secondary dynamic wave, an electric demister, an accident high-level water tank, a supernate storage tank, an inclined plate settling tank, a plate-and-frame filter press, a sulfur dioxide desorption tower, a waste acid storage tank, a water glass storage tank and a water glass preparation tank. The flue gas temperature is efficiently reduced through dilute acid washing and adiabatic evaporation, dust and acid mist in the smelting flue gas are removed, meanwhile, fluorine in the flue gas is removed by adding sodium water glass, and the situation that hydrogen fluoride in the flue gas reacts with a silicon-containing magnetic ring in the dry absorption third tower to be pulverized, so that a magnetic ring filler collapses is avoided; and system shutdown caused by serious activity reduction due to the fact that vanadium catalysts containing silicon dioxide in a converter are mutually bonded into blocks is avoided. Clean flue gas is provided for subsequent procedures, the production efficiency of the system is effectively improved, the safety of subsequent equipment is protected, and the service life of the subsequent equipment is prolonged.

The application relates to the technical field of industrial waste acid treatment, and particularly discloses an intelligent cracking reactor for alkylated waste sulfuric acid and a safety control system thereof, which comprises a composite hearth, a combustion zone, a cracking zone, a turbulent reaction zone and a quenching outlet zone in sequence along a material flow direction; an intelligent atomization unit is in communication with the cracking zone and used for spraying the atomized alkylated waste sulfuric acid into the cracking zone; an intelligent safety control unit is in signal connection with the composite hearth and the intelligent atomization unit; wherein the cracking zone is of a conical contraction structure, a gradient composite lining is arranged on the inner wall of the cracking zone, the gradient composite lining comprises a corrosion-resistant layer, a heat-conducting layer and a heat-insulating layer from inside to outside, and a guide plate is arranged in the turbulent reaction zone. The application can guarantee the uniformity and stability of liquid drop particle sizes, thereby improving the cracking reaction efficiency and reducing the risk of organic carbonization and coking.

The present application relates to water pollution prevention technical field, specifically, it relates to a kind of waste acid concentrated acid water and neutralization evaporation pretreatment device of nitrification waste water.It includes conveying assembly, the conveying assembly includes by sequentially arranged from bottom to top No.1 cylinder, No.2 cylinder and No.3 cylinder, No.1 cylinder and No.2 cylinder between fixedly connected with No.1 gradual change cylinder, No.2 cylinder and No.3 cylinder between fixedly connected with No.2 gradual change cylinder, the inside rotation of No.1 cylinder is provided with spiral conveying plate for conveying waste water.The present application is conveyed by spiral conveying plate, with the gradually reducing diameter of spiral conveying plate, tangential velocity of waste water gradually promotes, simultaneously because the pitch of spiral conveying plate gradually reduces, axial velocity of waste water gradually reduces, forms strong speed gradient, and small particles are thrown out, small particles are continuously collided, adsorbed and coalesced on spiral conveying plate, avoid its in subsequent evaporation process form difficult to clean scale layer.

The application discloses a method for removing heavy metals from electroplating waste acid, and belongs to the technical field of wastewater treatment. The method comprises the following steps: S1, filtering electroplating waste acid to obtain pretreated liquid; S2, adjusting the pretreated liquid to be acidic and then performing ultrafiltration to obtain filtered liquid; S3, adsorbing and separating heavy metals and sulfate by using amino imidazole phosphonic acid modified D851 resin; S4, eluting and desorbing the resin to regenerate and recycle; and S5, electrolyzing the sulfate solution to recover high-purity metal elements at a cathode and recover sulfuric acid at an anode. The method realizes efficient and deep removal of heavy metals from electroplating waste acid by a combined process, and simultaneously completes resource recovery of sulfuric acid and metals; the modified resin has strong acid resistance and good cyclic stability, the overall process is stable in operation, and the environmental protection benefit and economic benefit are outstanding, so that the method is suitable for industrial application.

The application discloses a chemical device waste acid direct sending system, belongs to the field of fine chemical industry, is suitable for methyl methacrylate (MMA) device by-product waste acid treatment, and aims at the problems of pipeline blockage, waste gas escape, high maintenance cost and unstable transportation caused by the secondary transportation of waste acid through a storage tank in the prior art. The system additionally arranges a forced circulation pump and a waste acid direct sending pump in a waste acid transportation path, is respectively configured in a 'two open one standby' mode and a 'one open two standby' mode, can accurately control a circulation amount, can cooperate with the use of a circulating shear force to disperse asphaltene in waste acid, can realize waste acid homogenization, and can directly transport the homogenized waste acid to a sulfuric acid device incinerator through an independent direct sending process without entering a buffer tank. The system effectively solves the problems of waste acid flow fluctuation and component unevenness, eliminates waste gas escape, reduces maintenance frequency and labor intensity, guarantees long-period stable operation of the incinerator, has remarkable economic and environmental benefits, and has wide popularization value.

This utility model discloses a membrane separation device for the purification and recovery of anodic oxidation waste acid. This membrane separation device aims to solve the technical problem that existing cleaning methods require disassembly and cleaning, which is time-consuming, labor-intensive, and can delay the process. It includes a circular shell with an end cap mounted on its left end. A filter membrane is mounted on the side wall of the end cap within the inner cavity of the shell. An inlet pipe is fixedly connected to the side wall of the shell near the right end, and an outlet pipe is fixedly connected to the left end face of the end cap, communicating with the filter membrane. A cleaning assembly is provided within the inner cavity of the end cap. The cleaning assembly includes a fixed plate fixedly connected to the inner wall of the end cap, with a movable plate rotatably connected to one side of the fixed plate. This utility model removes contaminants from the surface and pores of the filter membrane through instantaneous pressure fluctuations and water flow impacts, making it more efficient than traditional rinsing methods.

The application discloses a method for realizing collaborative resource treatment of kitchen biogas slurry and industrial waste acid, comprising the following steps: pretreating the kitchen biogas slurry into alkaline wastewater with pH=10.0-12.0 and temperature of 25-40 DEG C; at room temperature, blending the regenerated acid of the industrial waste acid into mixed acid with the mass ratio of sulfuric acid to phosphoric acid being 1.5:1-3:1, and diluting the mixed acid into acid absorption liquid with the total acid mass concentration being 5%-10%; pumping the obtained alkaline wastewater into the shell side of a hollow fiber membrane module at a flow rate of 100-500 mL / min, and pumping the obtained acid absorption liquid into the tube side of the hollow fiber membrane module at a flow rate of 100-500 mL / min, so that the acid absorption liquid and the alkaline wastewater are coupled to carry out membrane absorption reaction with the opposite flow direction. The application not only realizes the resource recovery of the kitchen biogas slurry and the industrial waste acid, but also realizes the collaborative resource treatment of 'waste treating waste', and has remarkable economic value and social significance.

The present application belongs to the technical field of inorganic porous gel materials, and particularly relates to a preparation method of a silicon-aluminum gel. Fluosilicic acid and an aluminum salt are used as raw materials to prepare a clear and uniform silicon-aluminum precursor solution under strong acid conditions, and then the solution is neutralized by ammonia water to form a gel to prepare an amorphous silicon-aluminum gel. The method realizes the molecular-level uniform mixing of silicon-aluminum components by forming a clear and transparent precursor solution from the aluminum source and the waste acid of the silicon source under strong acid conditions, thereby ensuring the uniformity of the product. In addition, the present application uses fluosilicic acid as the silicon source, thereby realizing the high-value utilization of the industrial by-product fluosilicic acid.

This invention provides a CMA environmentally friendly de-icing agent prepared from magnesite tailings and waste acetic acid, along with its preparation method and application. Belonging to the field of industrial solid waste treatment and utilization technology, it includes the following raw materials in parts by weight: 50-60 parts magnesite tailings, 40-80 parts waste acetic acid, 5-10 parts glacial acetic acid, 20-50 parts calcium oxide, and 1-5 parts magnesium oxide. By co-utilizing two industrial wastes—difficult-to-treat magnesite tailings and industrial waste acetic acid—a high-performance, low-corrosion CMA de-icing agent is prepared without deep purification. This achieves low-cost resource utilization of industrial waste and produces a competitive, environmentally friendly de-icing agent product, simultaneously solving multiple industrial and environmental problems such as solid waste accumulation, waste acid disposal, and the high cost and pollution of de-icing agents.

This application discloses a continuous preparation method and system for nano-barium sulfate based on waste acid resource utilization and internal circulation. It belongs to the interdisciplinary technical field of industrial waste resource utilization and advanced inorganic nanomaterial preparation. It aims to solve the technical bottlenecks of traditional processes for preparing barium sulfate, such as wide particle size distribution, low purity, pollution caused by the formation of soluble barium nitrate from nitrate ions, and low resource utilization. The method uses industrial waste acid containing sulfuric acid and nitric acid and a barium source as raw materials. The two are fed into a dual-channel centrifugal atomizer for atomization, mixing and reaction. The molar ratio of sulfate ions to barium ions is controlled. After separation and washing of the reaction products, most of the acidic washing liquid is recycled for slurry preparation, a small part is bypassed for purification, and CO2 is recovered and recycled. Finally, the product is dried to obtain nano-barium sulfate powder.

This invention belongs to the field of smelting, specifically relating to a method for treating smelting waste acid by sulfidation, including the following steps: (1) Sulfidation: After mixing the waste acid and sulfiding agent, the mixture enters a pipeline reactor for sulfidation reaction. The reaction temperature is 30-50℃, and the residence time in the pipeline reactor is 3-10 min; (2) Hydrogen sulfide desorption: After the sulfidation reaction, the reaction liquid is desorbed under negative pressure to obtain sulfidated liquid and desorbed gas; (3) Hydrogen sulfide absorption: First, the waste acid is used to absorb the hydrogen sulfide in the desorbed gas, and then liquid alkali is used to absorb the residual hydrogen sulfide. In the above scheme, the sulfidation reaction is carried out in a pipeline reactor, which not only ensures sufficient contact and thorough reaction between the waste acid and the sulfiding agent, but also avoids the defect of hydrogen sulfide escaping. After the reaction, the hydrogen sulfide in the liquid is released under negative pressure, and most of the hydrogen sulfide is absorbed by the waste acid. The residual waste acid is absorbed by liquid alkali, which greatly reduces the consumption of liquid alkali and reduces production costs.

The present application relates to a kind of neutralization slag synergic dewatering resource utilization method, belong to hazardous waste resource utilization technical field, including the following steps: S1: after waste acid is treated, liquid is removed sulfuric acid and fluorine by gypsum procedure, and produce sewage;S2: after adding lime milk, flocculating agent etc. to sewage and settling, the bottom stream containing neutralization slag is produced;S3: the bottom stream of neutralization thickener is added to slag concentrate slurry, then is sequentially introduced into slag concentrate thickener and vertical filter press, and the slag concentrate mixture is produced;S4: slag concentrate mixture is dosed with copper concentrate and quartz sand, and after the mixed ore after dosing is dried, it is introduced into smelting furnace and smelted, and the smelting slag is produced;S5: smelting slag is processed by slag ore dressing procedure, and the slag tailings and slag concentrate slurry are produced;S6: the bottom stream of neutralization thickener is mixed with slag concentrate slurry to form cycle.The present application solves the problem that the moisture of neutralization slag is high and difficult to dispose and the disposal cost is high, and realizes the resource utilization of valuable metal in neutralization slag.

This application relates to the field of molecular distillation equipment technology, and more particularly to a distillation apparatus and method for concentrating titanium dioxide waste acid based on multi-stage molecular distillation. The distillation apparatus includes a rotary motor, an inner cylinder, an outer cylinder, and a scraper. The inner cylinder is nested within the outer cylinder and connected to the output end of the rotary motor. The scraper is fixedly connected to the rotating surface of the inner cylinder, and the scraping surface of the scraper is spaced apart from the inner wall of the outer cylinder. The inner wall of the outer cylinder has at least two sets of grooves, the included angle between the planes of the two sets of grooves being 80° to 90°, and the two sets of grooves are evenly distributed in the upper and lower parts of the outer cylinder. The length of each groove set is less than or equal to 0.50 of the height of the inner wall of the outer cylinder. Through parameter design and structural optimization of the groove sets in the outer cylinder, this distillation apparatus achieves synergistic improvements in flow path extension, mass transfer process enhancement, and anti-clogging, resulting in a purity of over 40% for the heavy component discharged from the outlet, while the distillation apparatus remains free of clogging.