Method for continuously synthesizing nickel carbonate

Abstract

The invention relates to a method for continuously synthesizing nickel carbonate, which is characterized by comprising the synthesizing processes: adding and combining a nickel sulfate solution with the concentration of nickel ions from 50 g / l to 55 g / l and a sodium carbonate solution with the concentration from 120 g / l to 125 g / l into a synthesizing kettle according to a flow rate of 1 to 1.2:1, and controlling the pH value of a synthesizing process to be 8.3-8.6 to synthesize the nickel carbonate. The method strictly controls the adding rate of the two raw solutions and the pH values, effectively solves the problems in the prior art that because the excess sodium carbonate solution is added, more local complex salts (Ni1-x / 2-y / 2Nax(CO3)1-a-b / 2(SO4)a(OH)b are generated, the impurity content of the prepared nickel carbonate is higher, the impurities, such as sodium, chlorine, and the like are not easy to be removed in a washing process, thereby effectively improving the product quality of the nickel carbonate, and meeting the requirements of electronic-grade nickel protoxide production and electronic industry.

Description

technical field [0001] The invention relates to a continuous synthesis method of nickel carbonate. Background technique [0002] As an important compound of nickel, nickel carbonate is a widely used inorganic chemical raw material. It is mainly used to make various nickel salts. At the same time, nickel carbonate is also a good precursor of nickel oxide. High-quality nickel carbonate can be used in electronic class industry. [0003] At present, most domestic producers of nickel carbonate leached nickel-containing miscellaneous materials, and the filtrate was directly added to sodium carbonate to precipitate ordinary nickel carbonate without purification treatment. The pH value of the nickel carbonate synthesis process is controlled by artificial colorimetry. Due to the wide interval between the colorimetric cards of the wide range of pH test papers, only integer pH values ​​can be controlled. Visual colorimetry causes large fluctuations in the pH value at the end point, an...

AI Technical Summary

Problems solved by technology

The pH value of the nickel carbonate synthesis process is controlled by artificial colorimetry. Due to the wide interval of the colorimetric card of the wide range of pH test papers, only integer pH values ​​can be controlled. Visual colorimetry causes large fluctuations in the pH value at the end point, and the control range is wide.

Causes the sodium carbonate solution to add excessively during the synthetic process, the partial double salt [Ni 1-x / 2-y / 2 Na x (CO 3 ) 1-a-b / 2 (SO 4 ) a (OH) b 〕Generate more, the impurity content of the prepared nickel carbonate is higher, impurity such as sodium, chlorine are difficult to remove in the washing process, the nickel carbonate product quality is low, can't meet the requirement of producing electronic grade nickelous oxide and electronic industry

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