Process for regenerating hydrochloric acid for chloridizing laterite nickel ore by wet method

A laterite nickel ore and chlorination treatment technology, applied in the direction of magnesium chloride, chlorine/hydrogen chloride, magnesium halide, etc., can solve the problems of low equipment production capacity, high cost of hydrochloric acid regeneration, high energy consumption, etc., to improve efficiency, improve equipment production capacity and Comprehensive utilization efficiency of energy and full effect of heat utilization

Active Publication Date: 2008-11-19
CENT SOUTH UNIV
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the current hydrochloric acid regeneration process, the mother liquor after nickel precipitation is generally concentrated and then directly roasted at high temperature, which has problems such as high energy consumption and low equipment capacity, which makes the hydrochloric acid regeneration cost very high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] According to the mass percentage of coal powder in the roasting material is 1%, the mass percentage of the concentrated solution of the mother liquor after nickel precipitation in the roasting material is 50%; The percentage is 49%, and the total moisture content in the material is 50% for material preparation. The concentrated solution of the mother liquor after nickel precipitation, ferric chloride, magnesium chloride crystals obtained when the leaching solution is concentrated, and coal powder are prepared into a slurry and sprayed into a high-temperature furnace. Baking at 750°C.

[0025] The hot hydrogen chloride gas produced during the high-temperature roasting process is directly absorbed by water to obtain regenerated hydrochloric acid, which is returned for pulp leaching. High-viscosity iron oxide and magnesium oxide slags are cooled, crushed and pulverized as by-products.

Embodiment 2

[0027] According to the mass percentage of coal powder in the roasting material is 30%, the mass percentage of the concentrated solution of the mother liquor after nickel precipitation in the roasting material is 40%; The percentage is 30%, and the total moisture content in the material is 45% for material preparation. The concentrated solution of the mother liquor after nickel precipitation, ferric chloride, magnesium chloride crystals obtained when the leaching solution is concentrated, and coal powder are prepared into a slurry and sprayed into a high-temperature furnace. Baking at 700°C.

[0028] The hot hydrogen chloride gas generated during the high-temperature roasting process is directly passed into the laterite nickel ore leachate to heat and concentrate the leachate. The hydrogen chloride gas precipitated from the leachate is cooled and absorbed to regenerate hydrochloric acid or directly used for pulp leaching. High-viscosity iron oxide and magnesium oxide slags are...

Embodiment 3

[0030] According to the mass percentage of coal powder in the roasting material is 60%, the mass percentage of the concentrated solution of the mother liquor after the nickel precipitation in the roasting material is 30%, the mass percentage of ferric chloride and magnesium chloride crystals obtained when the leaching solution is concentrated in the roasting material The percentage is 10%, and the total moisture content in the material is 30% for material preparation. The concentrated solution of the mother liquor after nickel precipitation and the ferric chloride and magnesium chloride crystals obtained when the leaching solution is concentrated are prepared together to form a slurry, and the coal powder is sprayed into high temperature Baked in a furnace at 600°C.

[0031] The hot hydrogen chloride gas generated during the high-temperature roasting process is directly returned to the leaching process for pulp leaching. High-viscosity iron oxide and magnesium oxide slags are ...

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Abstract

The invention relates to a method for reproduction and utilization of hydrochloric acid in the process of extracting nickel and cobalt from laterite nickel ore. A chlorination treatment process of laterite nickel ore by wet method comprises the steps of preparing laterite nickel ore, leaching out chloride, concentrating leaching solution, precipitating by sulfurization, recovering hydrochloric acid, etc. The calcinating materials in the inventive hydrochloric acid reproduction process comprise the concentrated solution of the mother liquid after nickel precipitation, iron chloride and magnesium chloride crystals obtained during concentration of the leaching solution, and coal powder. The inventive method comprises the steps of mixing and blending materials to obtain slurry, and spraying into a high-temperature furnace, or calcinating the materials in high-temperature furnaces at 500-800DEG C, hydrolyzing metallic chloride into hydrogen chloride and metal oxide, heating the concentrated leaching solution by using the residual heat from the hot furnace gas, and absorbing the hydrogen chloride to reproduce hydrochloric acid, so as to realize closed circuit circulation of the hydrochloric acid. The high-viscosity ferric oxide and magnesium oxide dregs are cooled, broken and pulverized to powder, which is used as a byproduct for treatment. The inventive method improves the conversion rate and equipment productive capacity during chloride reproduction process, reduces energy consumption in hydrochloric acid reproduction, and realizes comprehensive utilization of the residual heat in hydrochloric acid reproduction.

Description

technical field [0001] The invention relates to a method for recycling hydrochloric acid in the process of extracting nickel and cobalt from laterite nickel ore, which belongs to the field of nonferrous metallurgy. Background technique [0002] Laterite nickel ore is a kind of nickel oxide ore, accounting for more than 65% of the total nickel reserves. Lateritic nickel ore can be 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-nickel ore is located in the lower part of the deposit. The content of silicon and magnesium is relatively high, the content of iron and cobalt is relatively low, but the content of nickel is relatively high, so it should be treated by pyrometallurgy. The ore in the middle transition can adopt pyrometallurgy or hydrome...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B7/01C01F5/30C01G49/10
CPCY02P20/129
Inventor 郭华军李新海王志兴胡启阳彭文杰张云河
Owner CENT SOUTH UNIV
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