Separation method of nickel in sulfate solution

Abstract

The invention discloses a separation method of nickel in a sulfate solution. The separation method includes the steps of: adjusting the pH value of a solution after cobalt extraction to 7-10 via a complexing neutralizer, and extracting and separating nickel with 260# solvent oil as a diluent and a nickel extraction agent as an organic phase to obtain an organic phase supporting nickel and a sulfate raffinate; and washing and reversal-extracting the organic phase supporting nickel to prepare a reversal-extract containing nickel and an organic phase. The method can effectively separate nickel ina high-concentration sulfate solution, is low in energy and reagent consumption, has short operation process, is low in equipment demand and can easily achieve continuous operation.

Description

technical field [0001] The invention relates to the technical field of hydrometallurgy, and relates to a method for separating nickel in a sulfate solution. The sulfate solution especially refers to the sulfate solution obtained after the cobalt intermediate product is leached with sulfuric acid and cobalt is extracted, and the solution mainly contains one or both of ammonium sulfate and sodium sulfate. Background technique [0002] Cobalt is an important strategic metal and a key functional element in materials such as lithium batteries and hard alloys. For a long time, my country's cobalt resources have been in serious shortage, and cobalt production mainly comes from by-products of nickel and copper metallurgical processes. About 90% of my country's annual demand for cobalt resources depends on imports. However, as cobalt resource exporting countries restrict the export of raw ore, my country imports less and less cobalt raw ore. Therefore, most of them are cobalt smelti...

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Problems solved by technology

Since the raw material contains NH 4 + , so the cobalt leaching solution contains NH 4 + , the cobalt leaching solution will contain NH 4 + , for example: the cobalt-extracting solution obtained by NaOH saponification is a high-concentration sodium sulfate solution containing ammonium sulfate, and the cobalt-extracting solution obtained by ammonia saponification is a high-concentration ammonium sulfate solution; this high-concentration ammonium sulfate solution may contain ammonium sulfate In the high-concentration sodium sulfate solution, 1-3g / L nickel will remain in the production process, but the current cobalt extraction process cannot effectively remove it. Although the nickel can be removed by sodium sulfide or ammonium bicarbonate precipitation method, but These two treatment methods are not easy to achieve continuous operation, and need to add stirring, filtering and other devices, and the obtained nickel intermediate product needs to be further dissolved and processed, and the operation process is cumbersome

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