A kind of preparation method of basic nickel carbonate

Abstract

The invention discloses a preparation method of basic nickel carbonate. In the method, sodium carbonate solution and nickel sulfate solution are mixed and solid-liquid separation is carried out to obtain basic nickel carbonate crude product and first mother liquor; A mother liquor prepares sodium sulfate crystals, and the liquid produced by freezing and crystallization is used for washing the basic nickel carbonate crude product, while the first mother liquor is treated by membrane separation, and the treated liquid is returned to prepare sodium carbonate solution and wash the basic nickel carbonate crude product, Finally, the washing water produced after washing is recovered and used again to prepare sodium carbonate solution and nickel sulfate solution; like this, the present invention has carried out multiple recycling of waste liquid in the synthesis process of basic nickel carbonate, and no waste water is produced in the whole process , At the same time, the nickel yield is high, the water consumption is less, and the by-product of sodium sulfate is recovered, which reduces the pollution to the environment and realizes green synthesis.

Description

technical field [0001] The invention relates to an industrial preparation method of basic carbonate, in particular to a preparation method of basic nickel carbonate. Background technique [0002] Basic nickel carbonate is an important inorganic fine chemical, mainly used to prepare various nickel salts, high-quality basic nickel carbonate, which can be used in electronics industry and catalyst industry; in addition, basic nickel carbonate is also widely used in Electroplating, electroforming, enamel pigments, etc. [0003] In the prior art, there are two common synthesis methods of basic nickel carbonate. One synthesis process is to use ammonium carbonate or ammonium bicarbonate and nickel salt to carry out precipitation reaction. When this process is synthesized, a large amount of ammonia and nickel form a soluble complexes, resulting in incomplete precipitation of nickel. In the production process of basic nickel carbonate, about 4.5 liters of waste liquid will be produce...

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Problems solved by technology

[0003] In the prior art, there are two common synthesis methods of basic nickel carbonate. One synthesis process is to use ammonium carbonate or ammonium bicarbonate and nickel salt to carry out precipitation reaction. When this process is synthesized, a large amount of ammonia and nickel form a soluble complexes, resulting in incomplete precipitation of nickel. In the production process of basic nickel carbonate, about 4.5 liters of waste liquid will be produced per kilogram of product. The waste liquid is slightly alkaline and has a pH value of about 8-9. In addition to containing a large amount of sodium sulfate, it also contains residual impurities such as nickel ions, phosphates, carbonates, and ammonia salts. If this waste liquid is discharged directly, it will not only pollute water sources, damage the ecological environment, but also cause waste of resources; A kind of synthesis process is to use soda ash and nickel salt solution to carry out precipitation reaction. When this process is synthesized, the pH value needs to be adjusted to more than 8.5, so that nickel can be basically precipitated completely. At this time, the amount of soda ash required is more than 35% more than the theoretical amount. , and excessive alkali can not recycle substantially, and the Na content in the product after material washing and drying is more than 300ppm (the product is the basic nickel carbonate that Ni content is 40%), and pH is more difficult to regulate when the waste water that washing produces reuses

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