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Combined high-pressure acid leaching method for cobalt alloy and oxide cobalt minerals

A technology of cobalt oxide ore and cobalt alloy, which is applied in the field of cobalt hydrometallurgy, can solve the problems of low cobalt leaching rate, no mention of copper leaching efficiency, and needs to be verified, so as to achieve efficient leaching, reduce risks, and improve reliability Effect

Inactive Publication Date: 2016-05-11
GUANGDONG JIANA ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the cobalt <0.3% in the leaching slag as the leaching end point, the cobalt leaching rate is low
In addition, this method does not mention the leaching efficiency of copper, which needs to be verified
Disclosed in CN102952954B is a kind of treatment method of trivalent cobalt-nickel oxide waste material and waste cobalt, nickel alloy, and this method realizes the leaching of cobalt, nickel in trivalent cobalt-nickel oxide and cobalt, nickel alloy under normal pressure condition likewise, But there are also many problems. The cobalt and nickel in the leaching slag are high, and the cobalt content in the slag reaches 24.4%.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Grind the copper-cobalt alloy containing 13.24wt% cobalt, 14.01wt% copper, 64wt% iron, and 1.52wt% silicon until it passes through a 200 mesh sieve, and mix it with an initial concentration of 2mol / L at a liquid-solid ratio of 10:1 Sulfuric acid solution was mixed, the reaction temperature was set to 90°C, the stirring speed was 300r / min, and leaching was carried out at normal pressure for 6 hours; the leached residue and ball milled to a 200-mesh sieve containing 11.05wt% cobalt, 2.92wt% copper, and 3.09wt% iron %, sulfur 0.021wt% hydrocobalt ore, mixed at a mass ratio of 1:2, and then mixed with water at a liquid-solid ratio of 10, the initial acidity was controlled to be 1.5mol / L, the temperature in the kettle was 200°C, and the stirring speed was 300r / min After reacting for 8 hours and filtering, the leaching results are as follows: the cobalt leaching rate is 99.85%, the slag contains 0.03% cobalt, the copper leaching rate is 99.86%, and the slag contains 0.02% cop...

Embodiment 2

[0023] Grind the copper-cobalt alloy containing 13.24wt% cobalt, 14.01wt% copper, 64wt% iron, and 1.52wt% silicon until it passes through a 200 mesh sieve. Sulfuric acid solution was mixed, the reaction temperature was set to 70°C, the stirring speed was 500r / min, and leaching was carried out at normal pressure for 10 hours; the leaching residue and ball milled to a 200-mesh sieve containing 6.05wt% cobalt, 4.92wt% manganese, and 8.62wt% copper %, iron 5.6wt%, sulfur 0.009wt% cobalt ore, mixed at a mass ratio of 1:8, and then mixed with water at a liquid-solid ratio of 4, the initial acidity was controlled to be 4mol / L, and the temperature in the kettle was 150°C. Stirring speed was 500r / min, reacted for 3 hours and then filtered. The leaching results were: cobalt leaching rate 99.94%, slag containing cobalt 0.014%, manganese leaching rate 99.96%, slag containing manganese 0.012%, copper leaching rate 99.93%, slag containing Copper 0.013%.

Embodiment 3

[0025] Grind waste nickel-cobalt alloys containing 16.32wt% cobalt, 50.72wt% nickel, 13.45wt% chromium, and 12.31wt% to pass through a 200 mesh sieve, and mix it with an initial concentration of 3mol / L sulfuric acid solution was mixed, the reaction temperature was set at 80°C, the stirring speed was 400r / min, and the normal pressure was leached for 8 hours; the leached slag and ball milled to a 200-mesh sieve containing 11.05wt% cobalt, 2.92wt% copper, and 3.09% iron. Wt%, sulfur 0.021wt% hydrocobalt ore, mixed at a mass ratio of 1:4, and then mixed with water at a liquid-solid ratio of 6, the initial acidity was controlled at 2mol / L, the temperature in the kettle was 180°C, and the stirring speed was 400r After reacting for 6 hours, the leaching results were: cobalt leaching rate 99.8%, slag containing cobalt 0.05%, nickel leaching rate 99.7%, slag containing nickel 0.065%, copper leaching rate 99.88%, slag containing copper 0.04%.

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Abstract

The invention discloses a combined high-pressure acid leaching method for cobalt alloy and oxide cobalt minerals. The method comprises the following steps that 1, after the cobalt alloy is subjected to ball milling, normal-pressure pre-leaching is carried out in a sulfuric acid system; 2, the oxide cobalt minerals obtained after ball milling and cobalt alloy normal-pressure pre-leaching residues obtained in the step 1 are mixed for size mixing; and 3, the materials are added into an autoclave after size mixing, and the autoclave is controlled to carry out pressure acid leaching for preset time at certain stirring speed at the preset temperature and pressure to obtain leachate and leaching residues. According to the method, based on the strong oxidizing property of the oxide cobalt minerals and the reducing property of the cobalt alloy, a dual-mineral method is adopted for combined leaching, a reducing agent needed for reduction decomposition of the oxide cobalt minerals can be met, and an oxidizing agent needed for oxidative decomposition of the cobalt alloy can also be met; comprehensive utilization of resources is achieved, and then production cost is greatly reduced; and meanwhile, the cobalt alloy and the oxide cobalt minerals are controlled to be in a proper ratio, so that simultaneous and efficient leaching of valuable metal in the two kinds of minerals is achieved, the reliability of the operation of operating personnel is improved, and the risks for the operating personnel in the production process are reduced.

Description

technical field [0001] The invention relates to the field of cobalt hydrometallurgy, in particular to a method for oxidizing and leaching cobalt alloys from cobalt oxide ore under pressure. Background technique [0002] my country is a country with poor cobalt resources. The main characteristics of cobalt resources are that there are many lean ores and few rich ores, and there is a lack of separate cobalt deposits. Cobalt mainly exists in the form of symbiotic elements in nickel, copper, iron and other veins, so cobalt is mainly used as nickel. , Copper and iron mines are recovered in the form of by-products, and primary cobalt resources are very few. Therefore, on the one hand, it is necessary to actively expand overseas cobalt resources, and on the other hand, it is necessary to strengthen the recycling of recycled cobalt resources to make up for the shortage of cobalt resources in my country. At present, my country has imported a large amount of cobalt concentrates from a...

Claims

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Application Information

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IPC IPC(8): C22B23/00C22B3/08C22B7/00
CPCC22B3/08C22B7/007C22B23/043Y02P10/20
Inventor 陈亮徐定源梁卫春付海阔
Owner GUANGDONG JIANA ENERGY TECH CO LTD
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