Crude nickel sulfate contains impurities such as iron, arsenic, antimony, copper, lead, zinc and free sulfuric acid, and needs to be purified.
The extraction method for refining nickel sulfate specifically includes the following steps: dissolution and oxidation of crude nickel sulfate - preparation of nickel soap - extraction for iron removal - extraction for copper removal - extraction for zinc removal - removal of organic impurities - a series of post-treatment steps. The nickel sulfate extraction and purification process is relatively complicated, mainly including extraction, acid washing, stripping and regeneration stages.
This method of refining nickel sulfate has changed the traditional method of refining nickel sulfate, greatly reduced the intensity of labor, and effectively avoided environmental pollution caused by hydrogen sulfide. At the same time, it also prevented the hydroxide and sulfide precipitation from taking away part of the nickel, thereby greatly improving the purification yield from the previous 85% to 95%, which enabled the yield of the refined product to meet the market requirements and the quality also met the requirements of chemical reagent grade.
Extraction Equipment——CWL-M Series Centrifugal Extractor
In the process of purifying nickel sulfate by extraction, the crude nickel sulfate solution is extracted and impurities are removed by using extractant. and then the extractant is used to extract and remove iron, copper, and zinc. The process flow is mainly as follows:
① Remove impurities such as Fe and Al: dilute the extractant and saponify it, then adjust the pH of the feed liquid, and use the saponified extractant to extract and remove impurities from the feed liquid through the CWL-M series centrifugal extractor to obtain the raffinate water phase and the loaded organic phase; the loaded organic phase needs to be washed with a CWL-M series centrifugal extractor and the detergent, and then the stripping agent is used to strip through the CWL-M series centrifugal extractor to obtain a regenerated blank organic phase and an impurity ion solution.
② Separate Ni from Ca and Mg to obtain the high-purity nickel sulfate solution: dilute the organic acid extractant and saponify it; use the saponified extractant to extract and separate the raffinate water phase through the CWL-M series centrifugal extractor to obtain a loaded organic phase and a raffinate water phase; the loaded organic phase is washed with the CWL-M series centrifugal extractor and the detergent, and then stripped with a stripping agent to obtain a battery-grade nickel sulfate solution.
The CWL centrifugal extractor is a product with independent intellectual property rights launched by Zhengzhou Tiei Extraction - it perfectly meets the needs of large flow ratio industrial hydrometallurgical nickel and cobalt extraction and separation. This series of CWL-M series centrifugal extractors has the following advantages:
①High metal extraction rate, up to 99.9%.
②Simple process flow, easy to operate.
③Stable quality of stripping solution, which can meet different production requirements.
④The amount of residual aqueous solvent after treatment is small, which can reduce the processing pressure of subsequent stages.
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