A kind of comprehensive recovery method of zinc, nickel, cobalt purification slag

A recovery method, sodium hydroxide technology, applied to the improvement of process efficiency, instruments, optics, etc., can solve the problems of complicated separation of nickel and cobalt, difficulty in separation and extraction, etc.

Active Publication Date: 2019-03-19
六盘水中联工贸实业有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even with high temperature and pressure above 200 °C and 1 MPa, cobalt can be converted into Co in the form of hematite 2 o 3 Crystallization and separation from zinc, but about 50% of nickel will be Ni 2 o 3 Enter Co. 2 o 3 In crystallization, it complicates the separation of nickel and cobalt
Therefore, it is also difficult to separate and extract raw materials containing zinc, nickel and cobalt by hydroxide or hematite method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: A certain enterprise wet-process zinc smelting high-temperature zinc powder replaces nickel and cobalt purification slag containing 30-40% zinc, 0.8-2.5% nickel, and 0.5-1.5% cobalt. After washing with hot water at 60-70°C for 3 times, the last wash contains 0.85g / L of sulfate, and then the liquid-solid mass ratio is 4:1, the leaching temperature is 90-95°C, and the concentration of sodium hydroxide is 165- leached twice under the condition of 170g / L. The primary leaching solution contains 37.5-43.5g / L zinc, 0.8-1.3g / L cobalt, and 152g / L sodium hydroxide; the second leachate contains 18-25g / L zinc, 0.3-0.5g / L cobalt, and The concentration is 160g / L. The alkali leaching residue contains 5-12% nickel, the total leaching rate of zinc is 95.2%, and the total leaching rate of cobalt is 86.3%. The primary alkaline immersion solution is electrolyzed in a magnetic field. The condition is to install two permanent magnets on both sides of the electrolytic cell, and t...

Embodiment 2

[0018] Embodiment 2: according to the leaching condition of embodiment 1, carry out one leaching with the raw material of embodiment 1 and the leaching solution for the second time, the electrolytic raffinate is used for leaching for the second time, and the primary leaching solution contains zinc 46-52g / L, and cobalt 1.2 -1.8g / L, sodium hydroxide concentration 158g / L. The secondary leaching solution contains 20-25g / L of zinc, 0.7-0.8g / L of cobalt, and 15.82% of nickel in the leaching residue. The total leaching rate of zinc was 96.8%, and the total leaching rate of cobalt was 90.5%. Electromagnets are installed on both sides of the electrolytic cell, the magnetic field strength H is 100A / m, the anode is a permanent magnet, and the magnetic field strength H generated by it is 20A / m. The rest of the electrolysis conditions were the same as in Example 1. After 36 hours of electrolysis, the cathode metal zinc powder was collected, with 99.1% of total zinc and 99.54% of metal zin...

Embodiment 3

[0019]Example 3: Nitroso β-naphthol cobalt removal agent is used to purify nickel and cobalt in zinc sulfate solution to obtain organic nickel and cobalt removal slag. Nickel and cobalt cannot be leached with sodium hydroxide solution, and it is obtained by calcining at 500 ° C for 2 hours Calcined slag containing 30-40% nickel and 15-20% cobalt is leached with 160-200g / L sodium hydroxide solution to obtain a primary leach solution containing 15-22g / L cobalt and 52.5% nickel in the leached slag. Under the electromagnetic field conditions of Example 2, Co(OH) 4 2- The electrochemical anodic oxidation of anode slime and cobalt slag contains 35-45% cobalt, and nickel and cobalt are better separated and enriched.

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Abstract

The invention relates to a comprehensive recovery method for zinc, nickel and cobalt-containing purification slag. The method comprises the following steps: washing the zinc, nickel and cobalt-containing purification slag with hot water till the content of sulfate radicals or chlorine ions of a lotion is smaller than 1g / L and then leaching the purification slag with sodium hydroxide; obtaining zinc and cobalt-containing alkaline leaching liquor and leached slag primarily containing nickel; putting the alkaline leaching liquor in a magnetic field and performing diaphragm electrolysis by takinga magnetic material as an anode and a stainless steel plate as a cathode to obtain metal zinc powder in a cathode region and the cathode and anode slurry primarily containing Co2O3 and Co3O4 in an anode region and the anode; washing and drying the anode slurry, reducing the same directly with hydrogen to obtain metal cobalt powder or sulfuric acid leached out, precipitating oxalic acid to obtain cobalt oxalate, then reducing the cobalt oxalate with hydrogen to obtain metal cobalt powder, and electrolyzing metal cobalt; returning the alkaline residual electrolyte to leach zinc, nickel and cobalt purification slag; and washing the nickel-containing leach residue and leaching the same with sulfuric acid, and enriching the same and performing electrolysis to obtain metal nickel. The method provided by the invention is short in process flow, high in separating recovery rate of zinc, nickel and cobalt and small in wastewater and waste residue amount.

Description

technical field [0001] The invention relates to the comprehensive recovery of zinc, nickel and cobalt from nickel and cobalt-containing slag produced by hydrometallurgy for purifying and removing nickel and cobalt slag from high-temperature zinc powder in hydrometallurgy, and belongs to the field of hydrometallurgy. Background technique [0002] So far, the purification process of hydrometallurgy mainly uses zinc powder to replace and purify copper and cadmium at low temperature (below 60°C), and to replace and purify nickel and cobalt at high temperature (above 80°C) with the participation of antimony salts or arsenic salts. The high-temperature purification slag obtained by purifying nickel and cobalt with an organic cobalt removal agent similar to β-naphthol contains zinc, mainly excessive zinc powder, accounting for more than 60%, and nickel and cobalt are mainly sponge nickel and sponge cobalt, accounting for more than 1% respectively At the same time, it also contains ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/04C25C1/16C25C1/08C22B23/00
CPCC22B7/007C22B7/008C22B7/04C22B23/043C25C1/08C25C1/16Y02P10/20
Inventor 刘安荣钟先杰刘洪波王振杰龙永斌钟波李世平
Owner 六盘水中联工贸实业有限公司
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