Method for leaching valuable metal

A valuable metal leaching technology, applied in the direction of improving process efficiency, can solve problems such as polluting the environment, increasing the difficulty of production operations, and consuming nitric acid, and achieves high leaching rate, high production efficiency, and reduced leaching costs.

Inactive Publication Date: 2012-07-04
HUNAN BRUNP RECYCLING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Oxidants such as nitric acid and potassium chlorate need to be added during the leaching process. For example, the separation and refining method of cobalt-manganese mixture described in the patent application number 98111313.3 needs to be leached in a m

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0016] Example 1:

[0017] Mix 120g of waste lithium cobalt oxide powder and cobalt sulfide recovered from water treatment at a cobalt molar ratio of 2.3:1, add 2.0mol / L sulfuric acid, control the liquid-solid ratio to 6:1, and react at 65°C for 4 hours. After filtration, the filter residue was washed twice with 200 mL of water, and the filtrate and washing liquid were combined to obtain 988 mL of metal ion-containing solution. The content of each metal element is shown in Table 1:

[0018] Table 1

[0019] Element

[0020] The acid leaching residue was dried and weighed 7.24g. The content of nickel and cobalt in the slag is as follows:

[0021] Table 2

[0022] Element

[0023] It is calculated that the leaching rate of cobalt reaches 99.85%, and the leaching rate of nickel reaches 99.58%.

Example Embodiment

[0024] Example 2:

[0025] Take the waste lithium cobalt oxide positive sheet and crush it through a 120-mesh sieve to obtain 118.5g of the undersize, which contains 55.7% of cobalt. Mix it with scrap metal nickel powder at a molar ratio of cobalt to nickel of 2.2:1, and add 1.5mol sulfuric acid / L, control the liquid-to-solid ratio to 8:1, leaching at 85°C for 2.5 hours, filtering, and washing the filter residue with 200 mL of water twice, combining the filtrate and washing to obtain 1106 mL of metal ion solution. The content of each metal element is shown in Table 3:

[0026] table 3

[0027] Element

[0028] The acid leaching residue was dried and weighed 8.31g. The nickel and cobalt in the slag are as follows:

[0029] Table 4

[0030] Element

[0031] The calculated cobalt leaching rate is 99.87%, and the nickel leaching rate is 99.79%.

Example Embodiment

[0032] Example 3:

[0033] Take 115.6g of waste nickel cobalt manganese oxide and add cobalt sulfide, nickel sulfide, and manganese sulfide, and mix it evenly according to the molar ratio of cobalt and nickel in the waste nickel cobalt manganese oxide to cobalt and nickel in cobalt sulfide and nickel sulfide as 2:1. Add 3.5mol / L sulfuric acid at 95℃, the liquid-solid ratio is 5:1, react for 6 hours, filter, the filter residue is washed twice with 200mL water, and the filtrate and washing liquid are combined to obtain 852mL metal ion solution. The content of each metal element is as follows 5:

[0034] table 5

[0035] Element

[0036] The acid leaching residue was dried and weighed 7.26g. The nickel and cobalt in the residue are shown in Table 6 below:

[0037] Table 6

[0038] Element

[0039] The calculated cobalt leaching rate is 99.60%, nickel leaching rate is 99.84%, and manganese leaching rate is 98.73%.

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PUM

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Abstract

The invention discloses a method for leaching valuable metal. The valuable metal is either nickel or cobalt or both; and the method comprises the following steps of: mixing two nickel-cobalt-containing materials with oxidizability and reducibility according to a certain ratio, and leaching the valuable metal from the mixed raw materials by using acid. According to the method, the nature that the oxidizability and the reducibility of the two nickel-cobalt-containing materials are complementary is fully utilized, the consumption of substances, such as a reductant and an oxidant and the like, is reduced, the method is environment-friendly and energy-saving, and the leaching efficiency of the valuable metal is high and the processing cost is low, so that the method has greater social and economic benefits.

Description

technical field [0001] The invention belongs to the comprehensive utilization of waste secondary resources, in particular to a technology for efficiently leaching nickel, cobalt and other valuable metals from materials containing nickel and cobalt. Background technique [0002] With the development of science and technology, a variety of nickel-cobalt-containing materials with excellent properties have been widely used, such as high hardness, high toughness alloy materials; high capacity, high cycle performance lithium-ion batteries and energy storage materials. In the process of manufacturing and using these materials, waste materials containing nickel and cobalt will be produced, such as waste alloys, waste secondary batteries, waste powder materials, nickel-cobalt oxides, nickel-cobalt sulfides, nickel-cobalt oxalate etc., one of which contains lithium cobalt oxide, lithium nickel oxide, lithium nickel cobalt oxide, lithium nickel cobalt manganese oxide, lithium nickel ma...

Claims

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Application Information

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IPC IPC(8): C22B23/00C22B3/08
CPCY02P10/20
Inventor 李达飞谭群英唐红辉蒋快良
Owner HUNAN BRUNP RECYCLING TECH
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