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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 mixed acidic environment of nitric acid and sulfuric acid, and a large amount of nitrogen oxides will be released during the leaching process. Increases the difficulty of production operations, pollutes the environment, and consumes expensive nitric acid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Mix 120 g of waste lithium cobaltate powder and cobalt sulfide recovered from water treatment in a cobalt molar ratio of 2.3:1, add 2.0 mol / L sulfuric acid, control the liquid-solid ratio to 6:1, and react at 65°C for 4 hours. Filter, wash the filter residue twice with 200mL of water, combine the filtrate and washing liquid to obtain 988mL of metal ion-containing solution, wherein the contents of each metal element are as follows in Table 1:

[0018] Table 1

[0019] the element

[0020] The acid leaching residue weighed 7.24g after drying. The content of nickel and cobalt in the slag is shown in Table 2:

[0021] Table 2

[0022] the element

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

Embodiment 2

[0025] Take the waste lithium cobalt oxide positive electrode and pulverize it through a 120-mesh sieve to obtain 118.5g of the sieve, which contains 55.7% cobalt, mixes it with waste metal nickel powder in a ratio of 2.2:1 by the molar ratio of cobalt to nickel, and adds 1.5mol of sulfuric acid / L, control liquid-solid ratio is 8: 1, leaching at 85 ℃ for 2.5 hours, filter, filter residue is washed twice with 200mL water, merge filtrate and washing liquid to obtain metal ion solution 1106mL, wherein each metal element content is as follows table 3:

[0026] table 3

[0027] the element

[0028] The acid leaching residue weighed 8.31g after drying. The nickel and cobalt in the slag are shown in Table 4:

[0029] Table 4

[0030] the element

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

Embodiment 3

[0033] Get waste nickel cobalt manganese acid lithium 115.6g and add cobalt sulfide, nickel sulfide, manganese sulfide, mix homogeneously by the mol ratio of cobalt and nickel in waste nickel cobalt manganate lithium and cobalt sulfide and nickel sulfide in 2:1, Add 3.5mol / L sulfuric acid at 95°C, the liquid-solid ratio is 5:1, react for 6 hours, filter, wash the filter residue twice with 200mL water, combine the filtrate and washing liquid to obtain 852mL of metal ion solution, and the content of each metal element is as follows 5:

[0034] table 5

[0035] the element

[0036] The acid leaching slag weighs 7.26g after drying, and the nickel and cobalt in the slag are as shown in Table 6:

[0037] Table 6

[0038] the element

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

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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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