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Method for recovering nickel, cobalt, iron and silicon from laterite-nickel ore by combined leaching process

A laterite nickel ore and combined leaching technology, which is applied in the fields of iron, silicon, cobalt, and nickel recovery, can solve the problems of low nickel and cobalt leaching rates, high acid consumption, and poor economic benefits, and achieve high nickel and cobalt recovery rates, The effect of low acid consumption and fast recovery speed

Inactive Publication Date: 2015-05-20
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
[0009] In short, in the above-mentioned invention patents of lateritic nickel ore wet smelting, 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 required, and their installation and Both are expensive to maintain; the HPAL process consumes more sulfuric acid than is required to stoichiometrically dissolve the non-ferrous components of the ore; the HPAL process is limited to processing mainly limonite-type feedstock; the HPAL process operates at high pressure The kettle is prone to fouling, and needs to be shut down regularly for cleaning, 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
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 recovering nickel, cobalt, iron and silicon from laterite-nickel ore by combined leaching process
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  • Method for recovering nickel, cobalt, iron and silicon from laterite-nickel ore by combined leaching process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Take 500Kg 2 # Add 500Kg of water to saprolite ore (dry) to make saprolite slurry, prepare 500Kg of concentrated sulfuric acid with a mass fraction of 98%, heat the saprolite slurry to 60°C, and the concentrated sulfuric acid to 200°C, then use a mortar pump and a concentrated sulfuric acid pump to The heated saprolite slurry and concentrated sulfuric acid are simultaneously fed into the feed port of the twin-screw pusher reactor. After rapid mixing, the saprolite slurry and concentrated sulfuric acid are forced to flow into the double-screw pusher reactor for rapid reaction to dissolve soluble non-ferrous metals. and soluble iron, after reacting for 1 minute, push the reaction material out of the double-screw pusher reactor. Cool down to below 60°C, simply crush the reaction material of the loose honeycomb solid paste and pour it into a water immersion tank, add 1500Kg of water, stir for 30 minutes to dissolve in water, and pump the resulting slurry into a plate and fr...

Embodiment 2

[0054] Take 500Kg 5 # Add 600Kg of water to saprolite ore (dry) to make saprolite slurry, prepare 500Kg of concentrated sulfuric acid with a mass fraction of 98%, heat the saprolite slurry to 100°C, and the concentrated sulfuric acid to 150°C, then use a mortar pump and a concentrated sulfuric acid pump to The heated saprolite slurry and concentrated sulfuric acid are simultaneously fed into the feed port of the twin-screw pusher reactor. After rapid mixing, the saprolite slurry and concentrated sulfuric acid are forced to flow into the double-screw pusher reactor for rapid reaction to dissolve soluble non-ferrous metals. And soluble iron, after reacting for 12 minutes, push out the reaction material into the twin-screw pusher reactor. Cool down to below 60°C, simply crush the reaction material of the loose honeycomb solid paste and pour it into a water immersion tank, add 1920Kg of water, stir for 30 minutes to dissolve in water, and pump the resulting slurry into a plate and...

Embodiment 3

[0068] 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.

[0069] Take 3000g 4 # Limonite (dry), add washing solution (E1) 6000ml to make limonite slurry, then move it into PARR4557 autoclave (17L), then add normal pressure leaching solution (B1) into the autoclave to make the final pH of the reaction material is 1.0, under pressure leaching for 60 minutes under the conditions of pressure 2.18MPa and temperature 215°C, Fe in normal pressure leach solution (B1) 3+ Hydrolyze to precipitate hematite and release acid and then leaching limonite; after cooling down to 80°C, remove the reaction slurry from the autoclave for solid-liquid separation and wash the filter residue to obtain 2800g of pressurized leaching residue (C3) (dry) , 7550ml of pressurized leaching solution (D3) and 4500ml of washing solution (F3), after removing non-nickel a...

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Abstract

The invention discloses a method for recovering nickel, cobalt, iron and silicon from laterite-nickel ore by a combined leaching process. The method comprises the following steps: adding muck ore slurry and concentrated sulfuric acid after heating into a double-spiral material pushing reactor; dissolving reaction materials in water, then performing solid-liquid separation, and washing filtration residues to obtain normal-pressure leaching residues, a normal-pressure leaching solution and a washing solution; preparing limonite ore slurry from the washing solution and limonite, adding the limonite ore slurry and the normal-pressure leaching solution into a pressurization kettle for pressurization and leaching, hydrolyzing Fe<3+> in the normal-pressure leaching solution to a hematite precipitate, and releasing acid to re-leach the limonite; reducing the temperature, and performing solid-liquid separation to obtain pressurized leaching residues and a pressurized leaching solution; removing non-nickel and cobalt impurities in the pressurized leaching solution, and then recovering nickel and / or cobalt by an existing method; washing the pressurized leaching residues with a soda ash solution, and then drying to obtain fine iron powder; and performing screening treatment on the normal-pressure leaching residues to obtain silicon dioxide and fine sand. The method disclosed by the invention has the advantages of short leaching time, high nickel leaching rate, low acid consumption and effective recovery of iron and part of silicon.

Description

technical field [0001] The invention relates to the technical field of hydrometallurgical technology of laterite nickel ore, in particular to a method for recovering nickel, cobalt, iron and silicon from laterite nickel ore through a combined leaching process. 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 . 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. Highly regolithed layers typically have most of the nickel they contain finely distributed in finely divi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B23/00C22B3/08C01B33/12
CPCY02P10/20
Inventor 刘月悦陈学安刘玉强路八智王少华孙巧庆孙渊君郝增选张连强陈小林
Owner JINCHUAN GROUP LIMITED
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