Method for extracting nickel and cobalt from nickel laterite by chloride roasting

A laterite nickel ore and roasting technology, which is applied to the field of nickel and cobalt extraction by chloride salt roasting of laterite nickel ore, can solve the problems of complex treatment process, large nickel loss, large impurity iron content in leaching solution, etc., and achieves simple operation process, less environmental impact, The effect of strong adaptation of raw materials

Active Publication Date: 2014-06-25
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Its biggest advantage is that it avoids the problems of large iron content in leaching liquid impurities, complicated treatment process, and large nickel loss in traditional metallurgical engineering.

Method used

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  • Method for extracting nickel and cobalt from nickel laterite by chloride roasting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Mix 50g of lateritic nickel ore with a particle size of 0.074-0.15mm and 10g of NaCl:MgCl 2 : CaCl 2 (0.1:0.3:0.6) chlorination agent is ground evenly and placed in a porcelain crucible, add water and mix evenly to form pellets (diameter 4cm), cover the porcelain crucible cover and place the crucible in a muffle furnace heated to 800°C for roasting After taking it out for 2h, leaching with pH=4.5 acidified water at 80°C for 20min, and then measuring the leaching rate of Ni, Co, Mn, Fe and Ni / Fe, Ni / Mg ratio in the leaching solution. Through the control of the above conditions, the leaching rate of nickel in low-grade laterite nickel ore reaches 86%, and the leaching rate of cobalt reaches 67%. The nickel-iron ratio increased from 0.0581 in the raw ore to 1.544, and the Ni / Mg ratio increased from 0.0123 in the raw ore to 0.487, which increased by 30 times and 40 times respectively, which significantly reduced the treatment capacity of the subsequent purification and imp...

Embodiment 2

[0023] Mix 50g of lateritic nickel ore with a particle size of 0.074-0.15mm and 8g of NaCl:MgCl 2 : CaCl 2 (0.2:0.5:0.3) chlorination agent is ground evenly and placed in a porcelain crucible, mixed with water to form pellets (diameter 3cm), covered with a porcelain crucible lid, and placed in a muffle furnace heated to 700°C for roasting After taking it out for 2.5h, leaching with pH=3.2 acidified water at 60°C for 40min, and then measuring the leaching rate of Ni, Co, Mn, Fe and Ni / Fe, Ni / Mg ratio in the leaching solution. Through the control of the above conditions, the leaching rate of nickel in low-grade laterite nickel ore reaches 83%, and the leaching rate of cobalt reaches 65%. The nickel-iron ratio rose from 0.0581 in the ore to 1.144, and the Ni / Mg ratio rose from 0.0123 in the ore to 0.387. Significantly reduces the processing capacity of the subsequent purification and impurity removal process.

Embodiment 3

[0025] Mix 50g of lateritic nickel ore with a particle size of 0.074-0.15mm and 9g of NaCl:MgCl 2 : CaCl 2 (0.3:0.1:0.6) The compound chlorinating agent is ground together evenly and placed in a porcelain crucible, add water and mix evenly to make pellets (diameter 2cm), cover the porcelain crucible and place the crucible in a muffle furnace raised to 600°C Internal roasting for 3 hours, after taking out, leaching with pH=2 acidified water at 50°C for 30 minutes, and then measuring Ni, Co, Mn, Fe leaching rate and Ni / Fe, Ni / Mg ratio in the leaching solution. Through the control of the above conditions, the leaching rate of nickel in low-grade laterite nickel ore reaches 85%, and the leaching rate of cobalt reaches 64%. The nickel-iron ratio rose from 0.0581 in the ore to 1.344, and the Ni / Mg ratio rose from 0.0123 in the ore to 0.417. Significantly reduces the processing capacity of the subsequent purification and impurity removal process.

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Abstract

The invention relates to the pyrometallurgical and hydrometallurgical field of non-ferrous metals, in particular to a method for extracting nickel and cobalt from nickel laterite by chloride roasting. The method provided by the invention comprises the following steps: grinding a chlorinating agent and ore material together and uniformly pelletizing, wherein the amount of the chlorinating agent accounts for 15-20wt% of the ore material; loading an ore sample which is well ground into a porcelain crucible, covering a cover, and placing into a tube furnace for roasting, wherein the roasting temperature is 600-800 DEG C and the roasting time is 2-3 hours; leaching the ore sample after roasting with acidified water with the pH value of 2-4.5 at the temperature of 50-80 DEG C for 20-40 minutes, then performing solid-liquid separation, and performing vacuum suction filtration to obtain nickel and cobalt filtrate. According to the method provided by the invention, the laterite with low nickel content is treated by a chloride roasting technology, and the selective chlorination of the nickel, the cobalt and other valuable metals, as well as iron and magnesium is realized; by using the acidified water method to leach the valuable metals, namely the nickel and the cobalt, the hydrolysis of ferric chloride is simultaneously inhibited, the loss of the nickel and the cobalt caused by precipitation is prevented, and the high leaching rate of above 85% of the nickel and high leaching rate of above 70% of the cobalt are simultaneously ensured.

Description

technical field [0001] The invention relates to the fields of pyrometallurgy and hydrometallurgy of nonferrous metals, in particular to a method for extracting nickel and cobalt by roasting laterite nickel ore with chlorine salt. Background technique [0002] Nickel and cobalt are important strategic reserve metals, which are widely used in national defense, aerospace, transportation, petrochemical, energy and other fields. , communications and batteries and other important raw materials. The global terrestrial primary nickel resources are mainly divided into two types: nickel sulfide ore and nickel oxide ore, of which nickel oxide ore accounts for 72%, which also contains a small amount of cobalt resources. The difficulty in dealing with laterite ore is that laterite ore cannot be significantly enriched by beneficiation before smelting, and the mined ore is directly subjected to metallurgical treatment. Therefore, the investment cost, the whole process processing capacity...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/08C22B23/00
Inventor 李金辉李洋洋郑顺
Owner JIANGXI UNIV OF SCI & TECH
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