Abstract: The present disclosure relates to the fields of chemical engineering and environmental protection, and in particular to a method of preparing high purity copper sulfate by using an acidic copper chloride etching waste liquid, which includes: introducing liquid ammonia into a first acidic copper chloride etching solution and a second acidic copper chloride etching solution, mixing the obtained solutions and allowing the mixture to be subjected to crystallization and filtration to produce an intermediate copper oxychloride; washing and separating copper oxychloride and adding it into a sulfuric acid solution to obtain a copper sulfate slurry, and then adding water to the copper sulfate slurry and performing cooling, crystallization and separation to obtain Semi-finished copper sulfate; adding a first solution to Semi-finished copper sulfate and then performing heating, and temperature-controlled filtration, and performing cooling, crystallization and centrifugation on an obtained first filtrate so as to obtain

Abstract: The present disclosure relates to the technical field of resource utilization of ammonia-nitrogen wastewater and in particular to a system for determining an evaporation endpoint by image recognition in an evaporation and crystallization process of an ammonia-nitrogen wastewater. The key points of the technical scheme are as follows: the system includes an evaporator, a sampling platform, a data transmission module, and an image recognition system; the sampling platform is disposed below an evaporation interface of the evaporator to collect crystals dropping from the evaporation interface and collect image information of the crystals; the data transmission module is configured to transmit data of the sampling platform to the image recognition system; the image recognition system is configured to process the image information of the crystals obtained by the sampling platform and determine an evaporation and crystallization endpoint.

Abstract: The present disclosure relates to the field of battery technologies and in particular to a bipolar current collector modified by a self-healing conductive coating and a preparation method and application thereof. The key points in the technical scheme are as follows: the method includes: preparing microcapsules containing a healing agent; preparing a slurry containing the microcapsules, a catalyst, an adhesive and a conductive filler; coating the slurry on a surface of a current collector substrate to obtain a bipolar current collector with a self-healing conductive coating. in a case of occurrence of perforation of the current collector, the self-healing microcapsules in the self-healing conductive coating may crack under an external stress and the healing agent is released and can immediately perform polymerization reaction under the action of a catalyst to generate a self-heating material which can quickly and accurately repair the cracks or holes on the current collector layer.

Abstract: 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 a