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Method for selective leaching of valuable metals in laterite nickel ore by chloride salt

A technology for laterite nickel ore and valuable metals, applied in the fields of manganese, nickel, and cobalt, which can solve the problems of high content of iron and other impurity metals, poor economic applicability, and increased workload, so as to reduce iron leaching and adapt raw materials Strong, less environmental impact

Active Publication Date: 2017-09-12
湖北长宸锂能循环科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since 72% of the world's nickel resource reserves come from laterite nickel ore, and low-grade laterite nickel ore cannot be significantly enriched, it is not suitable for pyrometallurgy, and even leaching after reduction roasting treatment will cause a lot of energy consumption
However, the leach solution obtained by traditional wet acid leaching treatment has a high content of iron and other impurity metals, which increases the workload of later purification and purification.
These disadvantages lead to poor economic applicability of related processes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Put 20g of laterite nickel ore material with a particle size of 0.15mm into the hydrochloric acid solution of 2mol / L ammonium chloride (the concentration of hydrochloric acid is 2mol / L, the solid-liquid ratio of the pulp is 1:4), and 1.5L / h, the leaching temperature is 90°C, and after leaching for 60 minutes, carry out solid-liquid separation by suction filtration while hot, and then measure the leaching rate of Ni, Co, Mn, and Fe in the leaching solution. Through the control of the above conditions, the leaching rate of nickel in low-grade lateritic nickel ore reaches 87%, the leaching rate of cobalt reaches 75%, and the leaching rate of manganese reaches 90%. The leaching rate of iron is only 19%, which significantly reduces the treatment capacity of the subsequent purification and impurity removal process.

Embodiment 2

[0020] Put 20g of laterite nickel ore material with a particle size of 0.074mm into the hydrochloric acid solution of 1mol / L ammonium chloride (the concentration of hydrochloric acid is 1mol / L, and the solid-liquid ratio of the pulp is 1:5), and oxygen 1L / h is introduced from the bottom , the leaching temperature is 100°C, the leaching time is 90min, suction filtration while hot, and then measure the leaching rate of Ni, Co, Mn, Fe in the leaching solution. Through the control of the above conditions, the leaching rate of nickel in low-grade laterite nickel ore reaches 83%, the leaching rate of cobalt reaches 72%, and the leaching rate of manganese reaches 89%. The leaching rate of iron is only 17%, which significantly reduces the treatment capacity of the subsequent purification and impurity removal process.

Embodiment 3

[0022] Put 20g of laterite nickel ore material with a particle size of 0.15mm into a hydrochloric acid solution of 4mol / L ammonium chloride (the concentration of hydrochloric acid is 4mol / L, and the solid-liquid ratio of the pulp is 1:6), and 0.5L / L of ozone is introduced from the bottom. h, the leaching temperature is 90°C, and after leaching for 120 minutes, it is suction filtered while it is hot, and the solid-liquid separation is carried out, and the obtained solution is the leaching solution. Through the control of the above conditions, the leaching rate of nickel in low-grade lateritic nickel ore reaches 93%, the leaching rate of cobalt reaches 83%, and the leaching rate of manganese reaches 91%. The leaching rate of iron is only 11%, which significantly reduces the treatment capacity of the subsequent purification and impurity removal process.

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Abstract

The invention relates to the field of wet metallurgy on nonferrous metal, in particular to a method for extracting nickel, cobalt and manganese from laterite-nickel ore.The method includes steps of crushing, grinding and sieving ore samples to obtain ore samples with the granularity of 0.074-0.15 mm under the control; dissolving chloride in hydrochloric acid to obtain hydrochloric acid and chloride solution; directly leaching the laterite-nickel ore by the aid of the hydrochloric acid and chloride solution, controlling the leaching temperatures and the leaching time, and filling the laterite-nickel ore with oxidizing gas from the bottom to enhance leaching of valuable metals and restrain leaching of contaminating metals.The method has the advantages that nickel and the cobalt which are the valuable metals can be leached, leaching of iron can be restrained, and accordingly loss of the nickel and the cobalt due to precipitates generated by the iron in leach liquor in follow-up working procedures can be prevented; the nickel leaching rate can reach 83% at least, the cobalt leaching rate can reach 72% at least, the manganese leaching rate can reach 89% at least, but the iron leaching rate is only 11-19%, and accordingly leaching of the iron can be reduced to a great extent.

Description

technical field [0001] The invention relates to the field of nonferrous metal hydrometallurgy, in particular to a method for extracting nickel, cobalt and manganese from laterite nickel ore. Background technique [0002] Nickel, cobalt and manganese are important strategic reserve metals, which are widely used in alloy doping and metal catalysts, especially as hydrogenation catalysts. In terms of alloys, nickel is mainly used to make stainless steel and other corrosion-resistant materials. Alloys with higher nickel content have stronger corrosion resistance. Cobalt and manganese are widely used in superalloys and high-performance special alloys, energy storage materials, magnetic materials, electromagnetic shielding materials, communication equipment and batteries, etc. Since 72% of the world's nickel resource reserves come from laterite nickel ore, low-grade laterite nickel ore cannot be significantly enriched, so it is not suitable for pyrometallurgy, and even leaching af...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/14C22B23/00C22B47/00
CPCC22B3/14C22B23/0446C22B47/00
Inventor 李金辉徐志峰陈志峰
Owner 湖北长宸锂能循环科技有限公司
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