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Method for extracting nickel, cobalt and iron from limonite

A technology of limonite and ore, applied in the direction of improving process efficiency, etc., can solve the problems of uneconomical and effective development and utilization of iron, expensive installation and maintenance, low leaching rate of nickel and cobalt, etc., to achieve efficient development and utilization, and avoid equipment Expensive, low sulfuric acid consumption effect

Inactive Publication Date: 2015-05-13
JINCHUAN GROUP LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In short, in the invention patent of laterite nickel ore wet smelting, the disadvantages of the high pressure acid leaching (HPAL) process and the improved high pressure acid leaching process are: the need for complex high temperature, high pressure autoclave and related equipment, its installation and maintenance Both are expensive; the HPAL process consumes more sulfuric acid than is required to stoichiometrically dissolve the non-ferrous metal components of the ore
The disadvantages of the atmospheric pressure acid leaching process and the improved atmospheric pressure acid leaching process are: high sulfuric acid consumption; low nickel and cobalt leaching rates; long reaction time and huge equipment required
The common disadvantage of high-pressure acid leaching including improved high-pressure acid leaching process and atmospheric pressure acid leaching process including improved atmospheric pressure acid leaching process is that the amount of leaching slag is large, and it is a mixed slag of silicon and iron, so that the main component of laterite ore, iron, cannot Economical and effective development and utilization
Although the invention patent of CN102206749A mentions the recycling of leaching slag, since the silicon dioxide, iron oxide, goethite, etc. Simple magnetic separation and other methods separate them, so the economic benefits of the development and utilization of the above-mentioned leaching slag are very poor, and they can only be treated as waste solids, and even the leaching slag with a low nickel leaching rate must be treated as hazardous waste.

Method used

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  • Method for extracting nickel, cobalt and iron from limonite
  • Method for extracting nickel, cobalt and iron from limonite
  • Method for extracting nickel, cobalt and iron from limonite

Examples

Experimental program
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Effect test

Embodiment 1

[0029] 1. Washing and classifying limonite ore, separating coarser minerals such as gravel and sandstone in limonite from the raw ore to obtain high-silicon-magnesium ore and low-silicon-magnesium ore;

[0030] 2. Set +80 purpose 2 # 500kg of high-silicon magnesium ore plus 500kg of water is prepared to obtain 50wt% ore slurry, which is for use;

[0031] 3. Simultaneously add 450kg of 98% concentrated sulfuric acid heated to 150°C to the double-screw pusher reactor and step 2 to prepare 50wt% ore pulp heated to 60°C. After mixing, it will be pushed out by the double-screw pusher reactor for the entire reaction time After 10 minutes, the material released by the double-screw pusher reactor is a crisp honeycomb solid paste, ready for use;

[0032] 4. Simply crush the crisp honeycomb solid paste obtained in step 3, pour it into a water immersion tank after crushing, add water equal to the weight of the crisp honeycomb solid paste, carry out the water dissolving step, and stir fo...

Embodiment 2

[0044] 1. Washing and classifying limonite ore, separating coarser minerals such as gravel and sandstone in limonite from the raw ore to obtain high-silicon-magnesium ore and low-silicon-magnesium ore;

[0045] 2. Add 500kg of water to 500kg of -80 mesh 5# high-silicon magnesium ore to prepare 60wt% ore slurry for use;

[0046] 3. Simultaneously add 450kg of 98% concentrated sulfuric acid heated to 150°C to the double-screw pusher reactor and step 2 to prepare 50wt% ore pulp heated to 60°C. After mixing, it will be pushed out by the double-screw pusher reactor for the entire reaction time After 10 minutes, the material released by the double-screw pusher reactor is a crisp honeycomb solid paste, ready for use;

[0047] 4. Simply crush the crisp honeycomb solid paste obtained in step 3, pour it into a water immersion tank after crushing, add water equal to the weight of the crisp honeycomb solid paste, carry out the water dissolving step, and stir for 10 minutes;

[0048] 5. P...

Embodiment 3

[0058] Steps one to five of the present embodiment, the atmospheric pressure acid leaching stage is the same as in embodiment 1, and the 3# low-silicon magnesium ore is replaced by 6# low-silicon magnesium ore in the pressurized leaching stage;

[0059] 6. Weigh 30 kg of +80 mesh 6# low-silicon magnesium ore obtained in step 1, add 60 L of washing liquid (E1) to prepare limonite slurry, heat it to 95 ° C, and move it into the circulation tank of the pressurized pipeline reactor, and then Add 30L of normal-pressure acid leaching filtrate (B1) at 95°C to the circulation tank of the pressurized pipeline reactor, so that the pH of the solution is 0.8; after sealing the circulation tank, turn on the booster pump, and at the same time turn on the heat transfer oil of the pressurized pipeline reactor Heating device, control the temperature and heat, when the temperature rises to 225°C, continue to heat at a constant temperature for 60 minutes, then stop heating and cool down; after co...

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Abstract

The invention discloses a method for extracting nickel, cobalt and iron from limonite, and belongs to the field of metallurgy. The method comprises the following steps: washing, selecting and classifying the limonite to obtain a high-silicon-magnesium mine and a low-silicon-magnesium high-iron mine; adding high-silicon-magnesium mine pulp and enough concentrated sulfuric acid to a double-helix shoving reactor at the same time so as to dissolve most of soluble nonferrous metal and soluble iron; then, performing solid-liquid separation so as to obtain constant-pressure leached residues and constant-pressure leached liquor; adding the constant-pressure leached liquor and the low-silicon-magnesium high-iron mine pulp to a pressurized pipeline reactor in proportion to be pressurized and leached; performing the solid-liquid separation so as to obtain pressurized and leached residues and pressurized and leached liquor; then purifying pressurized and leached filtrate so as to obtain iron concentrate products. The method has the advantages of high leaching efficiency of the nickel and the cobalt, low consumption of sulphuric acid, short reaction time and high production efficiency; besides, middle and low pressure equipment is used for performing pressurized and leached operations, so that the defects that high-pressure kettle equipment is expensive and encrustment is easy to occur are overcome; the main component, the iron, in ores can be economically and effectively recovered and effectively utilized, and the number of waste residues is small.

Description

technical field [0001] The invention relates to a process for leaching high-silicon-magnesium ore components of limonite under normal pressure with sulfuric acid and pressure-leaching low-silicon-magnesium and high-iron components with normal-pressure leaching solution, belonging to the field of metallurgy, and specifically relates to a process for extracting limonite Nickel, cobalt, iron method. Background technique [0002] Laterite ore is a nickel oxide ore formed by nickel-bearing peridotite after large-scale long-term weathering and leaching metamorphism in tropical or subtropical regions. Due to differences in geographical location, climatic conditions and weathering degrees, the types of laterite ore around the world are not completely the same . [0003] The weathering process generally produces layered deposits in which complete or most complete weathering is present near the surface, gradually becoming less weathered with increasing depth, and finally terminating ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/08C22B23/00
CPCY02P10/20
Inventor 孙志忠刘玉强沙滨刘召霞郝增选王少华刘世和张风竹杜昊马永刚
Owner JINCHUAN GROUP LIMITED