51results about "Copper chlorides" patented technology

The invention discloses an electronic waste efficient chlorination comprehensive recovery device and method, and relates to the technical field of chemical metallurgy, the electronic waste efficient chlorination comprehensive recovery device comprises a chlorination reaction cavity, a heating system, a vacuum system, an atmosphere control system and a condensation separation system; the heating system is used for controlling the temperature of the chlorination reaction cavity; the vacuum system is communicated with the heating system; the atmosphere control system comprises a chlorine gas source and a protective gas source; and the temperature of the condensation separation system is gradually reduced. Through the high-purity graphite heating assembly, the sealing structure and the atmosphere control system, the highest heating temperature is 1700 DEG C, the temperature limit of 1200 DEG C of a traditional quartz tube furnace can be broken through, the chlorine corrosion problem is solved, chlorine is not leaked, and the environment is not polluted. High-valued recovery of different metal resources can be achieved through low-temperature pyrolysis, high-temperature chlorination volatilization and three-stage condensation settling separation, and the method has the advantages of being low in energy consumption, high in recovery rate, environmentally friendly and the like and is suitable for industrial metal resource recovery.

Copper concentrate, such as chalcopyrite, is contacted with an aqueous solution containing an acid, and a reducing agent, such as vanadium(II) ions, chromium(II) ions, or zinc tungstoate (HZnW 12 O 40 ). The aqueous solution reduces the copper in the copper concentrate, which can then be dissolved in solution for recovery therefrom or precipitated from solution as copper compounds or elemental copper for recovery as a solid phase product. The solid phase product can then be isolated, dissolved, and further electrowinning to recover the copper product from the copper concentrate. The oxidized reducing agent can be recovered in an electrochemical device with a ferrous reactant. A hydrometallurgical route for converting copper concentrate to copper is potentially cheaper and less polluting than current high temperature smelting processes, and is an advantageous response to environmental and economic pressures for increased copper production.

The application discloses a preparation method of refined cuprous chloride, which comprises the following steps: preparing an oxygen-containing copper compound into refined cuprous chloride, wherein the method does not need high-purity copper salt compared with the existing wet process, so that the production cost is low; in addition, the method further introduces a protective agent and a reducing agent to coordinate with each other, so that the product purity is higher than that of the existing process; in addition, the method does not involve waste liquid, and the recovered liquid can be reused, so that the process flow is short, safe and environmentally friendly.

The invention discloses a method for preparing CuCl cubes with different sizes by adopting a low-temperature liquid phase synthesis method. According to the method, a copper chloride solution is used as a reaction medium, CuCl is used as an oxidizing agent, and the reaction temperature can be controlled to be 25 DEG C. Foamy copper is added into the solution, and the foamy copper serves as a carrier of CuCl and also serves as a reducing agent. A copper source in CuCl comes from two parts, namely a copper chloride solution and foamy copper. CuCl cubes with different sizes can be prepared in a controlled manner by regulating and controlling the reaction time and the reaction temperature. Then, the synthesized cuprous chloride cubes are immediately wiped away with filter paper, finally, the cuprous chloride cubes are dried for 6 h in a drying oven at the temperature of 40 DEG C, and finally the cuprous chloride cubes are stored in the drying oven. The product prepared by the preparation method is high in purity, good in dispersity and good in crystal form and can be synthesized at normal temperature, the generated CuCl is low in cost and good in reproducibility, and the photocurrent density reaches up to 1.27 mA cm <-2 >.

The invention discloses a method for resource utilization of copper-containing waste etching liquid and production of high-purity copper hydroxide, and belongs to the field of green cyclic recycling of copper-containing waste liquid. The method for preparing the high-purity copper hydroxide by using the copper-containing etching waste liquid comprises the following steps: mixing the copper-containing etching waste liquid with a crystal form inducer solution, adjusting the pH value to 3.0-8.0, then reacting, carrying out solid-liquid separation to obtain a solid-phase separated substance and filtrate, and carrying out aging treatment on the solid-phase separated substance to obtain a basic copper chloride precipitate; and adding ammonia water and a crystal form transforming agent into the basic copper chloride precipitate, then carrying out aging treatment, and carrying out solid-liquid separation to obtain the high-purity copper hydroxide powder. The prepared copper chloride hydroxide and copper hydroxide powder are large in particle size, the average particle size of the copper chloride hydroxide collection substance is 20-200 microns, and the average particle size of the copper hydroxide powder is 10-100 microns.

Compositions comprising high levels of high specific activity copper-64, and process for preparing said compositions. The compositions comprise from about 2 Ci to about 15 Ci of copper-64 and have specific activities up to about 3800 mCi copper-64 per microgram of copper. The processes for preparing said compositions comprise bombarding a nickel-64 target with a low energy, high current proton beam, and purifying the copper-64 from other metals by a process comprising ion exchange chromatography or a process comprising a combination of extraction chromatography and ion exchange chromatography.

Compositions comprising high levels of high specific activity copper-64, and process for preparing said compositions. The compositions comprise from about 2 Ci to about 15 Ci of copper-64 and have specific activities up to about 3800 mCi copper-64 per microgram of copper. The processes for preparing said compositions comprise bombarding a nickel-64 target with a low energy, high current proton beam, and purifying the copper-64 from other metals by a process comprising ion exchange chromatography or a process comprising a combination of extraction chromatography and ion exchange chromatography.

The invention discloses a CuCl nanocrystal for electrochemical sensing of methanol and an application of the CuCl nanocrystal. The preparation process of the high-purity CuCl comprises the following steps: preparing a CuCl2 solution, adding an additive KCl and a reducing agent ascorbic acid in proportion, and reacting for 6 hours at 60 DEG C; in addition, the invention also discloses a method for detecting the concentration of a methanol solution by using the CuCl nanocrystal modified working electrode. A methanol solution with known concentration is connected into an electrochemical workstation, working potential is set, and response current is measured. And then, fitting a function relationship according to the intensity of the response current and a known methanol concentration result, and calculating the concentration of methanol in the sample to be detected. Compared with commercial Pt / C of which the electric signal is rapidly attenuated, the electrochemical sensing taking CuCl as the working electrode can obtain a stable electric signal, and the accuracy of a detection result is ensured.

The invention relates to the technical field of basic copper chloride production, and discloses a device for producing basic copper chloride by recovering circuit board etching waste liquid, the device comprises a supporting box, the top of the supporting box is provided with a reaction kettle assembly, and the top of the supporting box is provided with an air heater, a supporting frame and a first weighing unit; a storage barrel assembly is arranged on the top of the supporting frame, and a driving motor is installed on the outer wall of the supporting box. The solution is added into the storage barrel main body, and the etching waste liquid is added into the reaction kettle main body at the same time, so that the control center monitors the weight in the reaction kettle main body through the first weighing unit, and calculates the weight of the required solution; and meanwhile, the control center detects the weight of the solution in the storage barrel assembly in real time through a second weighing unit, at the moment, a piston plate is sealed through a sealing plug, then an electromagnetic valve is opened, a servo motor is started, the servo motor drives a stud to rotate, and the stud drives a threaded sleeve to descend at a constant speed.

The invention discloses a method for treating chloride ions in a lithium precipitation mother liquor concentrated solution, which comprises the following steps: adding copper sulfate into an acid-regulated lithium precipitation mother liquor concentrated solution for reaction to obtain a copper chloride-containing lithium precipitation mother liquor concentrated solution; regulating the pH value of the lithium precipitation mother liquor concentrated solution, adding sodium sulfite to precipitate copper chloride in the form of cuprous chloride, and separating to obtain cuprous chloride precipitate and lithium precipitation feed liquid containing residual chlorine and bivalent copper; further concentrating the lithium precipitation feed liquid containing residual chlorine and bivalent copper to obtain concentrated feed liquid; and finally, regulating and controlling the pH value of the concentrated feed liquid, adding sodium sulfite into the concentrated feed liquid to reduce residual bivalent copper into monovalent copper, and adding cuprous chloride precipitate as a guide seed crystal to deeply remove residual chlorine and copper so as to obtain a lithium precipitation liquid.

The present disclosure relates to the technical field of preparation of copper chloride, and in particular to a method of preparing an electronic-grade copper chloride dihydrate, which mainly includes the following steps: dissolving a copper salt in a first hydrochloric acid solution to obtain a copper salt solution; performing two solid-liquid separations for the copper salt solution to obtain a filtrate; wherein, the two solid-liquid separations do not have sequence and include an adhesive separation and a co-precipitation separation; the adhesive separation is a solid-liquid separation performed by adding a waste PCB board powder and continuously stirring; the co-precipitation separation is a solid-liquid separation performed by adding tin chloride compound and continuously stirring; adding a second hydrochloric acid into the filtrate and adjusting pH and then performing evaporation concentration to a supersaturated solution, adding copper chloride seed crystal and then performing cooling crystallization and centrifugal separation.

The invention discloses a multi-stage condensation recovery process and device for preparing anhydrous copper chloride, and belongs to the technical field of anhydrous copper chloride preparation. The device specifically comprises an adjusting base, supporting stand columns are symmetrically arranged at the tops of the two sides of the adjusting base, and a material changing connecting cylinder frame is in transmission sleeving connection between the inner walls of the tops of the multiple sets of supporting stand columns; one end of the material changing connecting cylinder frame is sleeved with a water removing hot cylinder; according to the invention, a heater and a circulating fan are cooperated, a rotating frame in the barrel drives a micropore inner barrel I to rotate, copper chloride is uniformly heated and accelerated to evaporate, the circulating fan conveys dry hot air, a scavenging air valve I realizes heat cyclic utilization and condensation links, a condenser generates cold air, and a constant-speed rotating frame uniformly condenses the copper chloride; the exhaust plate and the second scavenging valve maintain the condensation environment stable, the air cylinder part is adjusted to open the discharging end cover, concentrated discharging is facilitated, and the machining efficiency and the product quality are integrally improved.

The application relates to a preparation method and application of a two-phase basic copper chloride heterojunction material. A phosphate is dissolved in deionized water to obtain solution A; copper acetate is dispersed in deionized water to obtain solution B; a chloride is added into the solution B to obtain a mixed solution C; the solution A is placed in an open container, the solution C is sprayed into the solution A in a static state, and a flocculent insoluble precursor is generated; the precursor is transferred into a container for ripening, so that the floating flocculent material is changed into a precipitate; after the ripening is completed and the temperature is lowered to room temperature, the obtained product is separated, washed and dried, and the two-phase basic copper chloride heterojunction material is obtained. The two-phase basic copper chloride heterojunction material prepared by the application is composed of two homologous basic copper chlorides, and simultaneously, there are different metal element dopings or different metal compound compounding in the inside.

The application provides a resource utilization method of scrapped filtering resin for power supply rectifier unit, and belongs to the technical field of filtering resin recovery. 2+ The application can elute the cations (Cu 2+ ) adsorbed on the resin, restore the scrapped filtering resin to the initial state, evaporate and crystallize the eluate, and obtain copper chloride as an industrial drying agent; in the pickling process, the resin bed contains excessive acid, the acid-base neutralization reaction can be carried out by alkali washing, the filtering resin is regenerated, and then is used for soft water preparation, so that the resource utilization of the resin and the cations in the scrapped filtering resin is realized.

The invention provides a method for preparing copper chloride dihydrate, which comprises the following steps: S1, dissolving copper salt in a hydrochloric acid aqueous solution to obtain a first solution; s2, adding H2O2 into the first solution, then adding UiO-66-NH2, uniformly mixing, and centrifuging to obtain a supernatant; and S3, filtering the supernate, and carrying out vacuum concentration, decompression and hot dissolution, cooling crystallization, centrifugal filtration and vacuum drying on the obtained filtrate to obtain the copper chloride dihydrate. According to the method disclosed by the invention, the impurity arsenic can be effectively removed by adopting UiO-66-NH2, and new impurities are not introduced. And meanwhile, the UiO-66-NH2 can be recycled, so that the production cost is reduced. According to the method, the technological process is simplified, the equipment requirement is reduced, meanwhile, the high purity and safety of the product are ensured, the arsenic content is remarkably reduced, the medicinal standard is met, and the production efficiency and the environmental protection level are remarkably improved.

The invention discloses a method for preparing cuprous chloride from copper chloride, and belongs to the technical field of vacuum preparation of cuprous chloride. The invention relates to a method for preparing cuprous chloride by using copper chloride, which comprises the following steps: carrying out microwave radiation heating on a mixed solution of CuCl2.H2O and CO (NH2) 2 under a vacuum condition, and respectively recovering generated CO2 and ammonia gas to obtain cuprous chloride; the temperature preservation stage of microwave radiation heating comprises three stages: in the first stage, the temperature is 10-25 DEG C, and the temperature is preserved for 10-30 minutes; the temperature of the second stage is 30-45 DEG C, and the heat preservation time is 15-35 minutes; and in the third stage, the temperature is 50-70 DEG C, and the heat preservation time is 15-45 minutes. The urea and the copper chloride solution are used as raw materials, and cuprous chloride with high purity and high yield can be obtained in a three-section heating and microwave radiation superposed manner. In addition, according to the preparation method of cuprous chloride, damage of covalent bonds of copper chloride can be accelerated, the decomposition temperature of copper chloride is reduced, and the reaction time is shortened.

A raspberry-like basic copper chloride nanomaterial with dual enzymatic activity, its preparation method, and its application are disclosed. The steps are as follows: Dimethyl sulfoxide is added to an aqueous sodium hydroxide solution containing N-fluorenemethoxycarbonyl-L-arginine (Fmoc-L-Arg), and the solution is sonicated until clear to obtain mixed solution A. An aqueous solution of copper chloride dihydrate (CuCl2·2H2O) is prepared for later use. The CuCl2·2H2O aqueous solution is added to mixed solution A to obtain mixed solution B, and the reaction is allowed to stand. After the reaction is complete, the precipitate is collected by centrifugation and washed with water. This invention employs a biomimetic mineralization method, using Fmoc-L-Arg molecules as templates to guide and control the formation of uniformly sized (130 nm) Cu2(OH)3Cl nanomaterials. These nanomaterials simultaneously possess dual enzymatic activities similar to peroxidase and glutathione oxidase, exhibiting good biocompatibility and enabling specific killing of tumor cells.

This application provides a spherical basic copper chloride and its preparation method. The preparation method includes: mixing seed crystals and water uniformly to obtain a seed crystal dispersion; the seed crystals include hydrochloric acid-catalyzed basic copper chloride; adding purified acidic copper-containing etching waste liquid, ammonia, and a stabilizer to the seed crystal dispersion to obtain a mixed reactant with a pH value of 4-5.5; heating the mixed reactant at a temperature of 40-80°C and stirring at a stirring speed of 100-200 r / min; separating the reactants after the reaction, collecting the solid material, and drying it to obtain the spherical basic copper chloride. In this application, during the crystal growth process, the reaction temperature is controlled to control the growth rate of the seed crystals, and the stirring speed is controlled to control the morphology of the crystals, thereby controlling the growth of the crystals to obtain spherical basic copper chloride. Furthermore, the continuous stirring process grinds the crystal surface, strengthening the structural strength of the crystals, resulting in a final crystal with a smooth surface and good overall structural stability.

The utility model relates to a berberine pharmaceutical wastewater treatment system which comprises a reactor, a first dehydration device, a macroporous adsorption resin column, a resin filter and a biochemical treatment device which are communicated in sequence, copper hydroxide reacts with copper chloride hydrate in the wastewater to generate basic copper chloride precipitates. By arranging the reactor, the first dehydration device, the macroporous adsorption resin column, the resin filter and the biochemical treatment device which are communicated in sequence, alkali substances such as sodium hydroxide can be added into the reactor, so that the alkali substances react with copper ions in the wastewater to generate copper hydroxide; copper hydroxide reacts with copper chloride hydrate and other substances in the wastewater to generate basic copper chloride precipitates, copper ions, chloride ions and other impurities are removed, berberine in the wastewater is adsorbed through resin in the resin filter, berberine is removed, and a downstream biochemical treatment device can conveniently treat other organic matter and other impurities in the wastewater.

A micronutrient supplement which is made by reacting together copper metal and either hydrochloric acid or cupric chloride under oxidizing conditions.

The invention discloses an evaporation and concentration process and device for preparing copper chloride dihydrate, and belongs to the technical field of catalyst concentration preparation, a multi-effect evaporation environment is formed by a first-effect evaporation tank and a second-effect evaporation box, stirring assemblies are arranged in a plurality of evaporation cavities of the first-effect evaporation tank, a plurality of stirring fans repeatedly rotate a mixed solution in a partitioned mode to upwards bring the mixed solution to a steam exhaust port, and the mixed solution is evaporated and concentrated. According to the double-effect evaporation box, a dynamic fluid is formed, the fluid is divided through a grating structure, the heat transfer evaporation effect is improved, the steam partial pressure is periodically reduced through intermittent steam exhaust, on one hand, continuous evaporation of the interior of the liquid is promoted, invalid loss of heat along with steam is reduced, and on the other hand, the instantaneous evaporation rate is increased; the pipe diameter is reduced, the flow speed of concentrated liquid is increased, the convective heat transfer coefficient is increased, the concentrated liquid easily forms falling film flow under the action of gravity and shear stress, steam discharge is promoted through the multiple gas overflow openings with different heights, and the heat exchange efficiency and evaporation rate of two-effect evaporation are effectively improved.

The invention discloses granular cuprous chloride and a production method thereof. The production method comprises the following steps: preheating a copper raw material; preparing a copper rod through hot rolling; the copper rod and chlorine are subjected to combustion reaction to generate cuprous chloride melt; granulating the molten mass to obtain a granular cuprous chloride product; the granulator comprises a roller, a transmission assembly, a granulation pressing plate and a check ring; a cooling assembly is integrated in the roller; the retainer ring eccentrically sleeves the outer side of the roller; one end of the granulation pressing plate is sleeved on the roller end cover pin, and the other end is elastically connected with the wall surface of the roller through a telescopic spring; particle model grooves are formed in the wall surface of the roller and the bottom surface of the granulation pressing plate. The torch type combustion reaction at the head of the copper rod achieves the purposes of safety, reliability and full and complete reaction; the rolling type granulator is designed for granulation, and the prepared granular cuprous chloride is free of adhesive, high in purity and large in specific surface area; the invention provides a low-cost, high-efficiency, energy-saving and emission-reducing production method for producing cuprous chloride by combustion of chlorine and copper.

The invention provides a method for recovering B-type basic copper chloride from copper-containing etching waste liquid and application. The method for recovering the B-type basic copper chloride from the copper-containing etching waste liquid comprises the following steps: S1, providing an acidic copper-containing etching waste liquid and an alkaline copper-containing etching waste liquid; s2, oxidizing the acidic copper-containing waste etching solution to obtain a first pretreatment solution; oxidizing the alkaline copper-containing waste etching solution to obtain a second pretreatment solution; s3, adding the first pretreatment solution and the second pretreatment solution into a substrate solution containing B-type basic copper chloride seed crystals for reaction to obtain a product containing B-type basic copper chloride; the temperature of the substrate solution is 80-90 DEG C, the pH value of the substrate solution is 4.0-6.0, and the temperature in the reaction process is kept at 80-90 DEG C. According to the method, the directional recovery rate of the B-type basic copper chloride in the copper-containing etching waste liquid can be improved.

The utility model relates to the technical field of feed production equipment, in particular to a cuprous chloride production mixing tank which comprises a smashing shell, a feeding groove is formed in the top of the smashing shell and communicated with the smashing shell, and the smashing shell is rotationally connected with a first smashing shaft and a second smashing shaft. The first smashing shaft is provided with first smashing teeth, the second smashing shaft is provided with second smashing teeth, the first smashing teeth and the second smashing teeth are arranged in a staggered mode, the first smashing shaft is provided with a first gear, the second smashing shaft is provided with a second gear, a motor support is arranged on one side of the smashing shell, and a first motor is fixed to the motor support. A power output shaft of the motor I is fixedly connected with a gear III, and the gear III is meshed with the gear I. The spiral teeth are spirally wound on the outer ring of the spiral shaft, cuprous chloride raw materials fall into the stirring and mixing shell through the screen, and the spiral teeth rotate to convey raw material waste materials in the discharging bin to the slag discharging opening.

The invention relates to the technical field of solid waste treatment, in particular to a method for recovering copper from copper-containing solid waste and preparing cuprous chloride, which comprises the following steps: (1) taking the copper-containing solid waste residue, and dissolving by using an acid solution; (2) adjusting the pH value of the copper-containing solution obtained in the step (1) to 3-3.5 by using an adjusting agent, and carrying out an adjusting reaction; (3) extracting by using an extracting agent and a stripping agent; and (4) adding an additive, a reducing agent and a template agent to obtain a mixture, reacting the mixture for 5-8 hours under the condition that the pH value is equal to 2-2.5, after the reaction is finished, carrying out solid-liquid separation to obtain a white solid, and rinsing and drying the white solid to obtain cuprous chloride. According to the method provided by the invention, the purity of the prepared cuprous chloride can reach 99% through a multi-step impurity removal process, the problems of more impurities and low purity of a traditional process product are solved, and the strict requirement of the high-end field on the purity of the cuprous chloride is met.

The invention relates to a synthesis process for improving the particle uniformity of basic copper chloride, which comprises the following steps: firstly, adding sodium citrate, EDTA-2Na or a compound solution of the sodium citrate and the EDTA-2Na into an acidic etching solution as a crystallization regulating agent to form a reversible complex with Cu < 2 + >; then, adding the pretreated acidic liquid and alkaline liquid into a reactor in a constant proportion at the same time at a constant speed in a parallel flow manner, and carrying out a precipitation reaction at a temperature interval of 60-80 DEG C and a pH value interval of 4.0-4.8; according to the method, the concentration of free copper ions is buffered through the regulating agent, explosive nucleation is inhibited, and a reaction system is kept stable in combination with parallel flow feeding, so that a uniform and controllable crystallization process is guided. The obtained copper chloride hydroxide product has the excellent characteristics of narrow particle size distribution, regular morphology, high tap density and good fluidity, and the product quality and application performance are remarkably improved.

The invention relates to a carbon crystallization defect treatment technology in carbon recovery, and aims to improve the production efficiency and avoid the carbon crystallization defect. According to a plurality of historical production cycle production reports of carbon recovery, obtaining abnormal data of carbon crystal defects and integrating the abnormal data into a defect comparison table; in the current production cycle, carbon crystal growth data are monitored in real time, and abnormal growth data are identified and integrated into a predicted abnormal group by constructing a two-dimensional coordinate system, setting a reference line and an early warning line and analyzing a production change curve; performing normalization, time sequence feature extraction and other processing on the production data on the super early warning curve, constructing a multivariable feature vector, selecting an LSTM architecture time sequence model, and training a large model by using historical sample data; the trained large model is used for predicting the carbon crystal defects in the current production cycle, whether the defects occur or not is judged according to comparison between the prediction probability and a threshold value, if yes, an alarm is generated, and technicians analyze reasons and intervene according to the alarm, so that the defects are effectively avoided, and the production efficiency and quality are improved.

The invention relates to the field of organic silicon, and provides an organic silicon slurry residue recovery treatment process which comprises the following steps: S11, gas pretreatment: pretreating a mixed gas of hydrogen chloride and chlorine to obtain a prepared mixed gas, and collecting the mixed gas of hydrogen chloride and chlorine from a process of preparing white carbon black from methyl trichlorosilane; s21, leaching reaction: carrying out hydrolysis treatment on the organic silicon slurry slag to obtain copper-containing silicon slag, blending the copper-containing silicon slag and water to obtain slurry, introducing the prepared mixed gas into the slurry to carry out leaching reaction, controlling the temperature of the leaching reaction to be 60-80 DEG C and the solid content of the slurry of the leaching reaction to be 15-30%, and separating to obtain copper-containing leachate; s31, grading treatment is conducted, specifically, copper ion concentration detection is conducted on the copper-containing leachate, and grading treatment is conducted at the same time; according to the process, cooperative treatment and resource utilization of the waste gas and the slurry residues are achieved, and a copper product with the higher additional value is obtained.

The invention relates to an unconventional valence metal compound composite material as well as a preparation method and application thereof, and solves the problems that the number of current unconventional valence systems is limited, the preparation method is relatively complicated, and protection conditions needing to be utilized for maintaining the unconventional valence are relatively harsh. The unconventional valence metal compound composite material is a composite functional material which takes a multi-layer reduced graphene oxide film as a main body and an unconventional valence compound which is self-filled into the reduced graphene oxide film as an object.

The invention relates to a wastewater dechlorination method based on a reduction-precipitation principle, belongs to the technical field of water treatment, and solves the problems of extremely high required acidity, high agent dosage, low efficiency and high residual copper ion concentration in wastewater dechlorination by an existing cuprous method. The method comprises the following step: mixing the chlorine-containing wastewater with sulfite and a copper ion-containing compound for reaction. According to the method, a traditional copper elementary substance reducing agent is replaced by a sulfite reducing agent, and the sulfite and the copper ion-containing compound are added into the chlorine-containing wastewater at the same time, so that the chloride ions are efficiently removed, the use amount of the copper ions and the concentration of the residual copper ions are reduced, the cost of the reducing agent is reduced, and meanwhile, the chloride ion removal efficiency is improved; and the required sulfuric acid concentration is low.