A method for leaching zinc from high-cobalt slag of hydrometallurgy

A technology for hydrometallurgical zinc and high cobalt, applied in the field of zinc leaching, can solve the problems of long process flow, high cost, difficulty in leaching zinc, etc., and achieve the effect of realizing recycling, low cost and remarkable effect.

CN111455162BActive Publication Date: 2021-12-28ZHENGZHOU UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2021-12-28

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Abstract

The present invention disclosed a method of immersing zinc from the high cobalt residue of wet zinc -refined zinc. It belongs to the field of zinc recovery technology, which solves the problem of immersion zinc, long process, and high cost from high cobalt residue in high cobalt residue.EssenceThe method of immersing zinc from the high cobalt slag of the wet method of zinc method includes the following steps: put the high cobalt residue into the roasting furnace for oxidation and roasting to get the roasting slag; the roasted slag grinding and screeningSoaking agent and adjusting the pH of the immersion agent; mix the roasting residue to be treated with the leaching agent to selectively immersed the zinc in the roasting residue, and the filtration to obtain the immersion liquid and immersion slag; mix the above leaching solution and oxalic acid solution for zinc sedimentation, filter the filtrationReceive the sedimentation and zinc after the oxalate and the sinking liquid; wash the zinc oxalate and wash it in a high -temperature roasting furnace for roasting and decomposition to obtain zinc oxide.The method of zinc immersed from the high cobalt residue of the wet -to -zinc in the present invention effectively solves the problem of separation of zinc and cobalt.
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Description

technical field

[0001] The invention belongs to the technical field of zinc recovery, in particular to a method for leaching zinc from high-cobalt slag of hydrometallurgy. Background technique

[0002] Zinc hydrometallurgy is the main process of zinc smelting, accounting for more than 80% of the total zinc production. In the hydrometallurgy process, the zinc sulfate solution needs to be purified to remove copper, cadmium, cobalt, etc. before entering the zinc electrolysis process. Zinc powder is usually added to the purification and impurity removal process to replace the cobalt, cadmium and other impurities in the zinc leaching solution. This process will produce a large amount of purified cobalt slag; this slag contains a large amount of elemental zinc and a small amount of cobalt, which has high economic value. . After the purified cobalt slag is pickled to remove most of the zinc, high cobalt slag with high cobalt content can be obtained. Due to the difficulty in sepa...

Examples

Embodiment 1

[0071] This embodiment provides a method for leaching zinc from the high-cobalt slag of hydrometallurgy, comprising the following steps:

[0072] (1) Oxidation roasting: put the high-cobalt slag into a high-temperature roasting furnace, and roast at 400°C for 30 minutes, so that the zinc and cobalt occurrences in the high-cobalt slag are phase-oxidized into metal oxides, and the oxidation rate is more than 80%;

[0073] (2) Grinding: crushing, grinding and sieving the high-cobalt slag after roasting until the particles with a particle size of less than 0.074mm account for more than 90% of the mass, and obtain the roasting slag to be processed;

[0074] (3) Alkaline leaching: configure the concentration of glycine leaching agent to be 50g / L, use sodium hydroxide solution to adjust the pH of the leaching agent solution to 11; mix the prepared glycine leaching agent with the roasted slag to be treated at a liquid-solid ratio of 5:1 , heated to 40°C, and leached for 1 hour under m...

Embodiment 2

[0078] This embodiment provides a method for leaching zinc from the high-cobalt slag of hydrometallurgy, comprising the following steps:

[0079] (1) Oxidation roasting: put the high-cobalt slag into a high-temperature roasting furnace, and roast at 450°C for 60 minutes, so that the zinc and cobalt occurrences in the high-cobalt slag are phase-oxidized into metal oxides, and the oxidation rate is more than 90%;

[0080] (2) Grinding: crushing, grinding and sieving the high-cobalt slag after roasting until the particles with a particle size of less than 0.074mm account for more than 90% of the mass, and obtain the roasting slag to be processed;

[0081] (3) Alkaline leaching: configure the concentration of glycine leaching agent to be 100g / L, use sodium hydroxide solution to adjust the pH of the leaching agent solution to 11.5; mix the prepared glycine leaching agent with the roasted slag to be treated at a liquid-solid ratio of 10:1 , heated to 60°C, leached for 5 hours under ...

Embodiment 3

[0085] This embodiment provides a method for leaching zinc from the high-cobalt slag of hydrometallurgy, comprising the following steps:

[0086] (1) Oxidation roasting: put the high-cobalt slag into a high-temperature roasting furnace, and roast at 500°C for 90 minutes, so that the zinc and cobalt occurrences in the high-cobalt slag are phase-oxidized into metal oxides, and the oxidation rate is more than 95%;

[0087] (2) Grinding: crushing, grinding and sieving the high-cobalt slag after roasting until the particles with a particle size of less than 0.074mm account for more than 90% of the mass, and obtain the roasting slag to be processed;

[0088] (3) Alkaline leaching: configure the concentration of glycine leaching agent to be 150g / L, use sodium hydroxide solution to adjust the pH of the leaching agent solution to 12; mix the configured glycine leaching agent with the roasted slag to be treated at a liquid-solid ratio of 15:1 , heated to 70°C, and leached for 15 hours u...