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Method for comprehensive exploitation of low-ore grade laterite nickel mine

A laterite nickel ore, low-grade technology, applied in the field of non-ferrous metallurgy, can solve the problems of high energy consumption of hydrochloric acid regeneration, difficulty in separation and utilization of base metals, etc., and achieve the effects of improving recovery rate, increasing added value, and reducing consumption

Active Publication Date: 2009-04-08
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a method for comprehensively processing low-grade laterite nickel ore for the base metal separation and utilization difficulties in the traditional acid leaching process and the large energy consumption of hydrochloric acid regeneration, and to achieve:

Method used

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  • Method for comprehensive exploitation of low-ore grade laterite nickel mine
  • Method for comprehensive exploitation of low-ore grade laterite nickel mine

Examples

Experimental program
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Effect test

Embodiment 1

[0042] The laterite nickel ore is ball-milled and passed through a 50-mesh sieve, and a -50-mesh ore sample is taken for leaching. The chloride leaching agent used is a mixed solution of magnesium chloride and hydrochloric acid, wherein the molar ratio of magnesium chloride to hydrochloric acid is 1:2, stirred and leached at 90°C, the time is controlled for 1 hour, and the leachate is analyzed after filtration, and the nickel leaching rate is determined to be 90.3 %, the cobalt leaching rate is 84.24%. Heat the leaching solution to 70°C, and feed in oxygen for 30 minutes. Keep the chloride ion in the system at 100g / L by heating, continue heating to 140-145°C, add a sufficient amount of deionized water every 10 minutes, vacuumize, control the time for 0.5 hours, and filter the precipitate. After analysis, 45.7% of ferric chloride was converted into precipitate. Return the regenerated hydrochloric acid to the leaching process for recycling. Na was added to the filtrate 2 S, ...

Embodiment 2

[0044] The laterite nickel ore is ball-milled and passed through a 50-mesh sieve, and a -50-mesh ore sample is taken for leaching. The chloride leaching agent used is a mixed solution of magnesium chloride and hydrochloric acid, wherein the molar ratio of magnesium chloride to hydrochloric acid is 2:1, stirred and leached at 100°C, and the time is controlled for 2 hours. After filtering, the leachate is analyzed and the nickel leaching rate is determined to be 94.45%. %, the cobalt leaching rate is 89.73%. Heat the leaching solution to 80°C, add hydrogen peroxide, and control the time for 2 hours. Keep the chloride ion in the system at 300g / L by heating, continue heating to 145-150°C, add a sufficient amount of deionized water every 20 minutes, let in air to aid flow, control the time for 1 hour, and filter the precipitate. After analysis, 65.82% of the ferric chloride was transformed into precipitates, and the regenerated hydrochloric acid was returned to the leaching proces...

Embodiment 3

[0046] The laterite nickel ore is ball-milled and passed through a 50-mesh sieve, and a -50-mesh ore sample is taken for leaching. The chloride leaching agent used is a mixed solution of magnesium chloride and hydrochloric acid, wherein the molar ratio of magnesium chloride to hydrochloric acid is 5:2, stirred and leached at 90°C, and the time is controlled for 3 hours. After filtering, the leachate is analyzed and the nickel leaching rate is determined to be 97.64. %, the cobalt leaching rate is 90.55%. Heat the leaching solution to 90°C, add potassium permanganate and sodium chlorate, and control the time for 2 hours. Keep the chloride ion in the system at 350g / L by heating, continue heating to 155-160°C, add a sufficient amount of deionized water every 2 minutes, let in air to aid flow, control the time for 2 hours, and filter the precipitate. After analysis, 77.2% of ferric chloride was transformed into precipitates, and the regenerated hydrochloric acid was returned to t...

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Abstract

The invention discloses a method for comprehensively developing low-grade nickeliferous laterite ore. The main technique comprises the steps of the preparation of minerals, chlorination and leaching, the oxidation of leachate, the regeneration of hydrochloric acid and the hydrolysis of settled iron, solid-liquid separation, sulfuration and sediment and the recycling of chloride and the like; the method is characterized in that the nickeliferous laterite ore is leached out by hydrochloric acid and the chloride at normal pressure and iron in the nickeliferous laterite ore is leached out as much as possible; leached ferrous ions are oxidized into ferric ion; the regeneration of hydrochloric acid and hydrolysis of settled iron are realized synchronously under the condition of normal pressure and the temperature of 140 to 180 DEG C; the collection of the regenerated hydrochloric acid prompts the hydrolysis reaction to be complete so as to obtain iron oxide red of byproduct; and after solid-liquid separation, filtrate enriched with nickel and cobalt carries out sulfuration and sediment and chloride solution is recycled. The invention discards the method of pyrohydrolysis or high-temperature roasting in the traditional technique, reduces the energy consumption of removal of iron and the regeneration of hydrochloric acid, improves the leaching rate of the nickel and cobalt and simultaneously develops and utilizes base metal in the ore reasonably so as to increase the additional value of the technique.

Description

technical field [0001] The invention belongs to the field of nonferrous metallurgy and relates to a method for comprehensively developing low-grade laterite nickel ore. technical background [0002] Nickel is an important strategic metal, which is widely used in key materials and high-tech fields such as stainless steel, superalloys, catalysis, secondary batteries, and fuel cells. With the development of the world economy, high-grade nickel ore resources have been increasingly exhausted. How to effectively develop low-grade laterite nickel ore, which accounts for about 2 / 3 of the world's nickel reserves, has become a research hotspot in nickel metallurgy today. [0003] Lateritic nickel ore is divided into limonite type and silicon magnesium nickel ore type. The limonite type is located in the upper part of the deposit, with high iron, low nickel, low silicon and magnesium, but relatively high cobalt content, and should be treated by hydrometallurgy. The silicon-magnesium-...

Claims

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Application Information

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IPC IPC(8): C22B3/04C22B21/00C01G49/02
CPCY02P10/20
Inventor 李新海李灵均王志兴郭华军胡启阳张云河彭文杰伍凌李金辉符芳铭
Owner CENT SOUTH UNIV
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