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Comprehensive recovery method for zinc, nickel and cobalt-containing purification slag

A recovery method and sodium hydroxide technology are applied in the direction of improving process efficiency, photographic technology, instruments, etc., and can solve the problems of difficult separation and extraction, complicated separation of nickel and cobalt, etc.

Active Publication Date: 2018-03-02
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: An enterprise's high-temperature zinc powder replacement nickel and cobalt purification slag in hydro-zinc smelting contains 30-40% zinc, 0.8-2.5% nickel, and 0.5-1.5% cobalt. After washing with hot water at 60-70℃ for 3 times, the last washing solution contains 0.85g / L sulfate, and then the liquid-solid mass ratio is 4:1, the leaching temperature is 90-95℃, and the sodium hydroxide concentration is 165- Leach 2 times under 170g / L condition. The one-time leaching solution contains zinc 37.5-43.5g / L, cobalt 0.8-1.3g / L, and sodium hydroxide concentration 152g / L; twice zinc-containing 18-25g / L, cobalt 0.3-0.5g / L, sodium hydroxide 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 placed in a magnetic field for electrolysis. The condition is that two permanent magnets are installed on both sides of the ...

Embodiment 2

[0018] Example 2: According to the leaching conditions of Example 1, use the raw materials of Example 1 and the second leaching solution for one leaching. The electrolytic residue is used for the second leaching. The first leaching solution contains 46-52g / L zinc and 1.2 cobalt. -1.8g / L, the concentration of sodium hydroxide is 158g / L. The second leaching solution contains 20-25g / L zinc, 0.7-0.8g / L cobalt, and 15.82% nickel in the leaching residue. The total leaching rate of zinc is 96.8%, and the total leaching rate of cobalt is 90.5%. Electromagnets are installed on both sides of the electrolytic cell, the magnetic field intensity H is 100A / m, and the anode is a permanent magnet, and the magnetic field intensity H generated by it is 20A / m. The remaining electrolysis conditions were the same as in Example 1. The electrolysis 36h collected cathode metal zinc powder, total zinc 99.1%, metal zinc 99.54%, 120h collected anode slime cobalt slag, containing 26.5% cobalt. The curre...

Embodiment 3

[0019] Example 3: Use nitroso β-naphthol to remove cobalt agent to purify nickel and cobalt in zinc sulfate solution to obtain organic nickel and cobalt slag. Nickel and cobalt cannot be leached with sodium hydroxide solution, and it is obtained by calcination above 500°C for 2 hours The calcined slag containing 30-40% nickel and 15-20% cobalt is leached with 160-200g / L sodium hydroxide solution to obtain a primary leachate containing 15-22g / L cobalt, and the leaching residue contains 52.5% nickel. Co(OH) was performed under the electromagnetic field conditions of Example 2 4 2- The electrochemical anodic oxidation, the cobalt slag obtained from the anode slime contains 35-45% cobalt, and the nickel and cobalt are 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 in the purification slag for removing nickel and cobalt from the high-temperature zinc powder purification of hydrometallurgical zinc smelting and other nickel-containing cobalt slag produced by hydrometallurgy, and belongs to the field of hydrometallurgy. Background technique [0002] So far, the purification process of wet zinc smelting 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 or arsenic salt. The high-temperature purification slag obtained from the purification of nickel and cobalt by organic cobalt removal agents 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% respective...

Claims

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Application Information

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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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