Process for synthesis of basic nickel carbonate from diacidic base

Abstract

The present invention discloses a process for synthesis of basic nickel carbonate from a diacidic base, according to the process, a sodium carbonate and sodium hydroxide mixed diacidic base is used for precipitation reaction with a soluble nickel salt, the reaction is one-step room temperature reaction, operation is easy, the base dosage is reduced by 20 to 30% compared with a pure soda base synthesis process, the environment is not polluted, and Na in the obtained basic nickel carbonate product (containing 40% of Ni) can be 100ppm or less.

Description

technical field [0001] The invention relates to a synthesis process of basic nickel carbonate, in particular to a process for synthesizing basic nickel carbonate with a binary base. Background technique [0002] At present, there are two methods for the synthesis of basic nickel carbonate in domestic enterprises. One synthesis process is to use ammonium carbonate or ammonium bicarbonate and nickel salt for precipitation reaction. During the synthesis of this method, a large amount of ammonia and nickel form a soluble complex, and nickel The precipitation is not complete, the degradation cost of ammonia is high during wastewater treatment, and the volatility of ammonia is high, which has caused great harm to the production environment. The other is to use soda ash and nickel salt solution to carry out precipitation reaction. When this method is synthesized, the pH value needs to be adjusted to more than 8.5, so that the nickel can be basically precipitated completely. At this...

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Problems solved by technology

[0002] At present, there are two methods for the synthesis of basic nickel carbonate in domestic enterprises. One synthesis process is to use ammonium carbonate or ammonium bicarbonate and nickel salt for precipitation reaction. During the synthesis of this method, a large amount of ammonia and nickel form a soluble complex, and nickel The precipitation is not complete, the degradation cost of ammonia is high during wastewater treatment, and the volatility of ammonia is high, which causes great harm to the production environment

The other is to use soda ash and nickel salt solution to carry out precipitation reaction. When this method is synthesized, the pH value needs to be adjusted to more than 8.5, so that the 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 the excess Alkali cannot be recycled basically. The Na content in the product after washing and drying the material is above 300ppm (the product is basic nickel carbonate with a Ni content of 40%). It is difficult to adjust the pH of the wastewater produced by washing.

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