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A lateritic nickel ore treating method combining atmospheric-pressure acid leaching and medium-pressure leaching

A technology of laterite nickel ore and atmospheric acid, which is applied in the direction of improving process efficiency, can solve the problems of long reaction time, high acid consumption, low nickel and cobalt leaching rate, etc., and achieves easy and effective separation, low operating costs, and investment. low cost effect

Inactive Publication Date: 2015-07-22
JINCHUAN GROUP LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this method has the following disadvantages and deficiencies: First, the time for leaching limonite under normal pressure is longer, usually more than 4 hours, so the required normal pressure leaching equipment is huge; the second is that the acid consumption is higher, and the total acid / ore=0.6 / 1. Although this acid consumption index is far lower than atmospheric acid leaching, it is much higher than high-pressure acid leaching; third, the amount of saprolite ore used is twice that of limonite, which also contradicts the ore belt composition of laterite ore , it is well known that in lateritic nickel deposits, the amount of limonite: the amount of saprolite ≥ 2:1
[0017] In short, in the invention patents of lateritic nickel ore hydrometallurgy mentioned above, the disadvantages of the high-pressure acid leaching (HPAL) process and the improved high-pressure acid leaching process are: complex High-temperature, high-pressure autoclaves and related equipment are expensive to install and maintain; the HPAL process consumes more sulfuric acid than is required to stoichiometrically dissolve the non-ferrous metal components in the ore; the HPAL process is limited to processing mainly It is the raw material of limonite; during the operation of the HPAL process, the autoclave is prone to fouling, and it needs to be shut down for cleaning regularly, and the operating rate is low
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
High-pressure acid leaching includes improved high-pressure acid leaching process and atmospheric pressure acid leaching process, including improved atmospheric pressure acid leaching process. The common disadvantage is that the amount of leached slag is large, and it is a mixed slag of silicon and iron, which cannot be economically and effectively developed and utilized.
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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  • A lateritic nickel ore treating method combining atmospheric-pressure acid leaching and medium-pressure leaching
  • A lateritic nickel ore treating method combining atmospheric-pressure acid leaching and medium-pressure leaching
  • A lateritic nickel ore treating method combining atmospheric-pressure acid leaching and medium-pressure leaching

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Take 500Kg (dry basis) and grind to -80 mesh 2 # Add 500Kg water to the saprolite ore to make saprolite slurry, prepare 500Kg concentrated sulfuric acid with a concentration of 98%, and use the mortar pump and concentrated sulfuric acid pump to strictly control the flow rate to synchronously add the saprolite slurry and concentrated sulfuric acid to the feed of the double-screw pusher reactor After rapid mixing, the pulp and concentrated sulfuric acid are forced to flow into the twin-screw pusher reactor for reaction, and the reaction takes 12 minutes.

[0053] When the temperature is lowered to below 60°C, the reaction material of the crisp honeycomb solid paste is simply broken and added to the water immersion tank, and 1500Kg of water is added, and after stirring for about 30 minutes, the obtained slurry is added to a plate and frame filter press for solidification. Liquid separation and filter residue washing, to obtain atmospheric pressure leach residue A1 185Kg (d...

Embodiment 2

[0063] Take 500Kg (dry basis) and grind to -80 mesh 5 # Add 500Kg of water to saprolite ore to make saprolite slurry, and prepare 450Kg of concentrated sulfuric acid with a concentration of 98%. Use the mortar pump and the concentrated sulfuric acid pump to strictly control the flow rate, and simultaneously feed the saprolite slurry and concentrated sulfuric acid into the feed port of the twin-screw pusher reactor. After rapid mixing, the slurry and concentrated sulfuric acid are forced to flow into the double-screw pusher reactor for reaction , The reaction time is 10 minutes.

[0064] When the temperature is lowered to below 60°C, simply crush the reaction materials of the crisp honeycomb solid paste and add them to the water immersion tank, add 1500Kg of water, and stir for about 30 minutes. Pump the water-soluble slurry into a plate and frame filter press for solid-liquid separation and filter residue washing to obtain 230Kg (dry) atmospheric acid leaching filter residue ...

Embodiment 3

[0074] The normal-pressure acid leaching stage of the present embodiment is the same as that of Example 1, and in the pressure leaching stage, 1 Sinka Limonite changed to 4 # Indonesian limonite.

[0075] Take 3000g (dry) 4 # Limonite, add washing solution (E1) 6000ml and be mixed with limonite slurry and move in the PARR4557 autoclave (17L), then add normal pressure acid leaching filtrate (B1) 3000ml in the autoclave, record the reaction mass The final pH was 0.8. Adjust the pressure of the autoclave to 2.5 MPa and then control the temperature to heat. When the temperature rises to 215°C, continue to heat at a constant temperature for 50 minutes, then stop heating and cool down. After the temperature was lowered to 80°C, the reaction slurry was removed from the autoclave for solid-liquid separation and the filter residue was washed to obtain 2800 g of pressurized leaching residue C3 (dry), 7550 ml of pressurized leaching liquid D3 and 4500 ml of washing liquid F3. See Ta...

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Abstract

The invention provides a lateritic nickel ore treating method combining atmospheric-pressure acid leaching and medium-pressure leaching, is aimed at providing of a hydrometallurgical process that is low in acid consumption and high in leaching rate for lateritic nickel ore, and relates to a process method for subjecting saprolite to sulfuric acid atmospheric-pressure leaching and subjecting limonite to pressure leaching by utilization of atmospheric-pressure leachate in the same process. The method achieves treatment of the saprolite and the limonite in the same process, adopts the process combining the atmospheric-pressure acid leaching and the medium-pressure leaching, overcomes the defects that present high-pressure acid leaching processes need autoclaves and related devices so that the manufacturing and maintenance costs are high, and overcomes the technical problem that the high-pressure acid leaching processes are high in acid consumption and are limited to treatment of limonite type raw materials. Compared with atmospheric-pressure leaching processes, the method has beneficial effects comprising higher nickel and cobalt recovery rates, easy and effective separation of leached slag, and the like.

Description

technical field [0001] The invention relates to a hydrometallurgical process of lateritic nickel ore, in particular to a treatment method for performing atmospheric pressure leaching of saprolite with sulfuric acid and pressure leaching of limonite with normal pressure leachate in the same process. Background technique [0002] Laterite ore, also known as laterite nickel ore, is a nickel oxide ore formed by nickel-bearing peridotite in tropical or subtropical regions after large-scale long-term weathering and leaching metamorphism. Laterite ore types are not all 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 at some deeper depth as unweathered rock. [0004] Usually, people subjectively divide laterite deposits into three layers from top to bottom, namely limonite deposits, transition dep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B23/00C22B3/08
CPCY02P10/20
Inventor 杨志强王永前刘玉强孙志忠沙滨杜昊李正禄赵有刚魏建周王少华
Owner JINCHUAN GROUP LIMITED