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Method for efficiently recovering iron, scandium and aluminum from limonite type lateritic nickel ores

A technology for recovering iron from laterite nickel ore, which is applied to the improvement of process efficiency, instruments, optics, etc., can solve the problems of low metal recovery rate, high production cost, high equipment requirements, etc., and is beneficial to iron enrichment, simple and effective separation effect

Active Publication Date: 2018-12-14
MEISHAN SHUNYING POWER BATTERY MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this patent reduces acid consumption, it still needs to pass oxygen under high temperature and high pressure, which requires high equipment, and cannot efficiently treat limonite-type lateritic nickel ore, resulting in a large amount of waste residue
[0008] To sum up, it can be seen that the improvement of lateritic nickel ore refining process in the above-mentioned prior art still has disadvantages such as high production cost, harsh process conditions, and low metal recovery rate, and almost only considers the nickel and cobalt in limonite-type lateritic nickel ore. recovery and utilization, ignoring valuable metal elements such as iron, scandium and aluminum in recovered minerals

Method used

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  • Method for efficiently recovering iron, scandium and aluminum from limonite type lateritic nickel ores

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Effect test

Embodiment 1

[0036] Such as figure 1As shown, a method for efficiently recovering iron, scandium and aluminum from limonite-type laterite-nickel ore includes: taking 2 tons of limonite-type laterite-nickel ore for crushing / fine grinding, so that the ore in the ore powder has a particle size of less than 74 μm Accounting for 100% of the total weight of the crushed / finely ground ore. Take an appropriate amount of mineral powder, add nitric acid with an initial acidity of 300g / L to the mixture, under the conditions of leaching temperature of 180°C, leaching time of 1h, liquid-solid ratio of 1:1g / mL, and stirring speed of 500rpm , to carry out selective leaching to obtain iron concentrate with an iron content of 60%; the leaching solution is subjected to controlled precipitation / separation operation, and the pH is controlled to 4.3 by adding calcium oxide, the precipitation temperature is 50°C, the precipitation time is 2h, and the stirring speed is 200rpm The aluminum-scandium mixture is obt...

Embodiment 2

[0038] A method for efficiently recovering iron, scandium and aluminum from limonite-type laterite-nickel ore, comprising: taking 2 tons of limonite-type laterite-nickel ore ore for crushing / fine grinding, so that the ore with a particle size of less than 74 μm in the ore powder accounts for the 80% of the total weight of ore after crushing / fine grinding. Take an appropriate amount of mineral powder, add nitric acid with an initial acidity of 300g / L to the mixture, and leaching at a temperature of 150°C, a leaching time of 2 hours, a liquid-solid ratio of 1:3g / mL, and a stirring speed of 600rpm. , to carry out selective leaching to obtain iron concentrate with an iron content of 61%; the leaching solution is subjected to controllable precipitation / separation operation, the pH is controlled to 4.2 by adding magnesium oxide, the precipitation temperature is 80°C, the precipitation time is 1h, and the stirring speed is 150rpm The aluminum-scandium mixture is obtained. After the a...

Embodiment 3

[0040] A method for efficiently recovering iron, scandium and aluminum from limonite-type laterite-nickel ore, comprising: taking 2t of limonite-type laterite-nickel ore ore for crushing / fine grinding, so that the ore with a particle size of less than 74 μm in the ore powder accounts for the 70% of the total weight of ore after crushing / fine grinding. Take an appropriate amount of mineral powder, add nitric acid with an initial acidity of 200g / L to the mixture, under the conditions of a leaching temperature of 200°C, a leaching time of 0.5h, a liquid-solid ratio of 1:5g / mL, and a stirring speed of 300rpm Selective leaching was carried out to obtain iron concentrate with an iron content of 60%; the leaching solution was subjected to controlled precipitation / separation operation, and the pH was controlled to 4.0 by adding calcium carbonate, the precipitation temperature was 30°C, the precipitation time was 3 hours, and the stirring speed was 150rpm to obtain an aluminum-scandium...

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Abstract

The invention discloses a method for efficiently recovering iron, scandium and aluminum from limonite type lateritic nickel ores. The method comprises the following steps: carrying out crushing or fine grinding on the limonite type laterite nickel ores to obtain ore powder; carrying out selective leaching on the ore powder through nitric acid to obtain sulfur-free iron ore concentrates, of which the iron content exceeds 60%; carrying out controllable sedimentation or separation on a leach solution by adding magnesium oxide, calcium oxide or calcium carbonate, so that an aluminum-scandium mixture is obtained; after baking dehydration of the aluminum and scandium mixture, adding an approximate amount of cryolite and carrying out molten salt electrolysis to directly prepare aluminum-scandiumalloy; and neutralizing a solution obtained through the controllable sedimentation or separation to prepare nickel and cobalt hydroxides, or carrying out extraction-electrodeposition on the solution to prepare nickel and cobalt products. The method provided by the invention has the advantages that under mild conditions without external pressurization, both selective nickel and cobalt leaching andefficient iron, scandium and aluminum recovery and utilization can be achieved, both the nickel and cobalt leaching rates can reach above 90%, the iron and scandium recovery rates can reach above 95%,and the aluminum recovery rate can reach 65%, so that iron, scandium, aluminum, nickel and cobalt in the limonite type lateritic nickel ores can be efficiently recovered and utilized.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of complex polymetallic resources, in particular to a method for efficiently recovering iron, scandium and aluminum from limonite-type lateritic nickel ore. Background technique [0002] Nickel ore resources are mainly divided into oxide ore and sulfide ore. Current statistics show that the former accounts for more than 70%, but only produces about 50% of nickel. With the increasing demand for nickel and cobalt in the market and the depletion of nickel sulfide ore resources, the laterite nickel ore with abundant reserves has attracted people's attention. How to efficiently and economically selectively extract nickel and cobalt from laterite nickel ore has become the key question. The wet process for extracting laterite nickel ore is mainly atmospheric acid leaching process and pressurized acid leaching process, and the pyrometallurgy process is mainly RKEF method. These process...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/06C22B21/00C22B59/00C25C3/36C25C1/24C22B23/00
CPCC22B3/065C22B21/0015C22B23/0438C22B23/0461C22B59/00C25C1/24C25C3/36Y02P10/20
Inventor 马保中王成彦陈永强曹志河邢鹏张文娟张家靓
Owner MEISHAN SHUNYING POWER BATTERY MATERIALS CO LTD
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