Basic copper chloride production method

Abstract

The invention discloses a method for producing tribasic copper chloride. The method for producing the tribasic copper chloride includes the following steps of: (1) removing impurities from an acidic etching waste solution; (2) adding clean water or a tirbasic copper chloride production mother solution to a synthesis reactor, performing preheating, and then, preheating the acidic etching waste solution whose impurities have been removed and an alkaline solution of sodium hydroxide and mixing the two solutions for a reaction with the pH value and temperature of the reaction being controlled so as to gradually form the tribasic copper chloride, and discharging partial materials after a certain amount of reaction time; (3) filtering the materials discharged from the reaction system, and performing washing, suction filtration, centrifugation and drying on the filtrated residues to obtain the tribasic copper chloride; and (4) performing ammonia nitrogen removal treatment on filtrated liquid. By adopting the method for producing the tribasic copper chloride in the invention, continuous production can be achieved and the tribasic copper chloride with large particle size and high purity can be produced; further, production cost can be reduced and overall process can be integrated; and the method for producing the tribasic copper chloride is advantaged in simple ultimate steps of ammonia nitrogen removal, easiness in operation as well as reduced difficulty and cost of ammonia nitrogen treatment.

Description

technical field [0001] The present invention relates to a recycling method of copper-containing etching waste liquid, in particular to a method for preparing animal feed copper source additive—basic copper chloride by using acidic etching waste liquid as a raw material, belonging to the field of etching waste liquid treatment and the production of animal feed. Background technique [0002] In the animal breeding industry, copper is a trace element necessary for animal growth. It plays an important role in maintaining the normal physiological metabolism of animals and improving immunity. It can participate in the synthesis of heme and the maturation of red blood cells. Osteogenic process, pigmentation and keratinization of hair and fur. A large number of feeding data prove that adding copper can improve the growth rate and daily food intake of animals and promote the refinement and high quality of feed. [0003] As the most important and first developed copper additive, co...

AI Technical Summary

Problems solved by technology

As far as our country is concerned, copper sulfate has been added as a feed additive in most feeds so far. However, copper sulfate has many substantial defects besides the advantage of low price: 1. It has high water solubility and is very It is easy to absorb water, so it is easy to be damp and agglomerated, and it is easy to harden and corrode processing and production equipment

2. It has a strong oxidation effect and is easy to be reduced, which can destroy the vitamins in the feed and lead to fatty acid spoilage, thus destroying the nutritional content of the feed to a certain extent

3. The absorption and utilization rate of copper sulfate is low, and it has an antagonistic effect on the absorption of other trace elements, such as iron and zinc, which greatly reduces the normal absorption of trace elements in feed, and affects the normal metabolism and biological function of animals. Utilization

[0012] Although the above-mentioned multiple prior art techniques have been developed, so far, these methods still have multiple defects and / or deficiencies, such as: 1. The raw materials are usually acidic Etching waste liquid and alkaline etching waste liquid, and the production of alkaline etching waste liquid has been decreasing day by day, so when neutralizing acidic etching waste liquid, it is sometimes necessary to replace it with ammonia water, but the disadvantage of this method is that ammonia nitrogen needs to be artificially added during production , increasing the difficulty and cost of follow-up wastewater treatment. At the same time, this process route has high production cost, increased operating procedures, high labor intensity, and waste gas pollutes the environment. The main evaporation recovery system (MVR) of ammonium chloride in the mother liquor is still It is not mature enough, the corrosion problem of the compressor head has not been well solved, and the quality of the recovered ammonium chloride is poor; 2. Most of them are only recovered for copper, and the filtrate, waste water, etc. have not been further treated, resulting in In order to meet the environmental protection discharge standards, more funds and equipment have to be invested in post-treatment; 3. Both alkaline etching waste liquid and acidic etching waste liquid are directly neutralized, which leads to subsequent waste water containing A large number and variety of heavy metal ions, and other various organic impurities, such as the basic cupric chloride mother liquor produced in this process mainly contains 1-5 g / L of copper and 30-60 g / L of ammonia nitrogen, If it is discharged directly without treatment, it will cause serious pollution to the environment, which is not in line with the purpose of environmental protection

And if it is to be processed, the processing difficulty of waste water is extremely high, and the processing cost is high, which has seriously affected the economic benefits of the manufacturer; Other multiple conditions are optimized and creatively excavated, so that the content of basic copper chloride in the obtained product is not high, and there are many impurities