Extracting and purifying technology of high purity nickel

Abstract

The invention relates to an extracting and purifying technology of high purity nickel, mainly comprising the following steps of firstly, adding oxidant of hydrogen peroxide in nickel sulfate, adding sodium carbonate after complete reaction, producing and precipitating complex compound, and deironing by filtering; secondly, using P204 after clarifying mother solution, carrying out homogeneous saponification by using sodium hydroxide, carrying out countercurrent extraction, obtaining Cu hydrochloric acid by carrying out backextraction on an organic phase by using sulfuric acid segmentation by segmentation, and obtaining metals such as Co, Mn, Ca, Zn and the like by treating the Cu hydrochloric acid by backextraction; and thirdly, using P507 as raffinate, carrying out homogeneous saponification on the raffinate by using the sodium hydroxide, carrying out countercurrent extraction, obtaining magnesium by treating an organic phase of dilute sulfuric acid by backextraction, recovering magnesium sulfate by an aqueous phase, obtaining nickel by carrying out backextraction on the residual organic phase plus anolyte or the dilute sulfuric acid, and obtaining electronic grade nickel sulfate from the aqueous phase. The technology has the advantages of simple process, low cost and high metal yield without solid waste calcium and magnesium slag, fluoride reagent consumption and environmental pollution.

Description

technical field [0001] The invention relates to the technical field of extraction of nonferrous metals, in particular to a high-purity nickel extraction and purification process. Background technique [0002] There are many reports on the methods of extracting and separating cobalt, calcium, magnesium, copper, manganese and zinc from the nickel matrix solution, but there are few reports on methods for extracting magnesium and extracting nickel to separate cobalt, calcium, magnesium, copper, manganese and zinc. few. At present, the more common method for the purification of electrowinning catholyte is: to remove calcium and magnesium by traditional sodium fluoride, ammonium fluoride or ammonium fluoride composite salt precipitation method, and then extract the solution after calcium and magnesium removal into P204 to remove copper and manganese Zinc-calcium-cobalt, P507 extracts nickel, making it meet the requirement of producing 99.98% electro-nickel catholyte. (It can als...

AI Technical Summary

Problems solved by technology

The advantage of this method is that it can meet the product quality requirements. However, due to the use of reagent precipitation to remove calcium and magnesium, not only the solid slag produced contains high nickel and the metal yield is low, but also the introduction of fluorine increases the difficulty of industrial wastewater treatment, and the use of reagents Expensive, increased a lot of production costs

[0003] The recently announced 2007100715004 patent method (a method for extracting and removing calcium and magnesium from a copper-cobalt leaching solution) is a good method for purifying and removing calcium and magnesium from high-cobalt and low-nickel solutions, but it is not suitable for purifying and removing calcium and magnesium from high-nickel and low-cobalt solutions.