Method for extracting metal from laterite mine

A technology for extracting metals and laterite ores, applied in crucible furnaces, electric furnaces, rotary drum furnaces, etc., can solve problems such as inconvenient operation and achieve energy saving effects

Inactive Publication Date: 2008-08-20
邓彤
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But these two methods are all inconvenient to operate, and additional fuel is needed for heating during roasting.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Finely grind the laterite ore containing (dry basis) 1.43% Ni, 0.041% Co, 21.43% Fe, 9.06% Mg and 35.43% moisture and divide it into two parts. Feed to the roaster (Test I); the other part was fed to the roaster (Trial II) after being mixed with sulfur at a weight ratio of 4:1 while stirring 5% w / w concentrated sulfuric acid. Both test I and test II were calcined at 700°C for 1 hour, and the calcined sand was directly discharged from the furnace into the stirring leaching tank for leaching for 2 hours. The leaching tank does not need additional heating, and the leaching temperature in the tank can reach above 80°C. After leaching, the pulp was separated from solid to liquid, and the leaching slag and leaching liquid were analyzed respectively, and the leaching rates of nickel and cobalt in the two tests were calculated as Ni 90.32%, Co 93.33%, Fe 3.13% (Test I); Ni 90.48%, Co 93.60% , Fe 2.99% (test II). It can be seen that the present invention can effectively extrac...

Embodiment 2

[0022] The laterite ore of Example 1 was uniformly mixed with cobalt-copper concentrate containing 1.62% Cu, 0.58% Co, 0.36% Ni and 28.55% S, and sulfur at a weight ratio of 4:1:1. The main useful minerals of the cobalt-copper concentrate are chalcopyrite, pyrite and cobalt pyrite. The obtained mixture was calcined at 650° C. for 2 hours, and the calcined sand was treated according to the method of Example 1. The leaching rates of nickel, cobalt and copper obtained were 89.95% for Ni, 94.02% for Co, and 95.67% for Cu.

Embodiment 3

[0024] The laterite ore containing 1.85% Ni, 0.053% Co and 48.2% moisture was finely ground and divided into two parts, each with pyrrhotite containing 1.26% Ni, 0.50% Cu, 0.033% Co, 22.76% S and 46.68% Fe The concentrate was mixed uniformly at a weight ratio of 1:1, and one part was directly fed into the roaster (Test I); the other part was fed into the roaster after adding 5% w / w sodium sulfate (Test II). The main useful minerals of the pyrrhotite concentrate include pyrrhotite, pentlandite, chalcopyrite and pyrite. Two kinds of tests are all carried out roasting and leaching by embodiment 1, and the nickel of two tests, cobalt and copper leaching rate are respectively Ni 89.73%, Co 91.27%, Cu 93.16% (test 1); Ni 90.34%, Co 93.18%, Cu93 .99% (Test II). The test shows that the leaching result of adding sodium sulfate is slightly higher than that without adding sodium sulfate.

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PUM

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Abstract

The invention relates to a method for selectively extracting metal from lateritic ore containing nickel and cobalt in an economic, effective and energy-saving way. The method comprises the steps that (1) the grinded lateritic ore is blended with substance containing sulfur and added with sulfuric acid or not; the obtained mixture is then roasted to cause non-ferrous metals in the mixture to selectively convert into respective sulphate and iron converts into oxide; (2) water is used for leaching the roasted mixture and the nickel, the cobalt and the copper are extracted out of the mixture into leachate; and (3) the leachate and leached slag are separated and the nickel, the cobalt and the copper are extracted out of the leachate with methods of precipitation, solvent extraction or ion exchange.

Description

field of invention [0001] In general, the present invention relates to methods of extracting metals from laterite ores. Specifically, the present invention provides a method for sulphating and roasting the above-mentioned ore, and then leaching the roasted product with water or dilute sulfuric acid, thereby extracting nickel, cobalt and other metals therein. Background of the invention [0002] Laterite refers to a mixture of hydrated iron oxide and hydrated magnesium silicate formed by long-term large-scale weathering, leaching, alteration and enrichment of basic rocks such as olivine or serpentine. It is a loose clay-like mineral with a large amount of water. Nickel oxide ore resources are easy to mine but difficult to process. At present, the usable part of laterite ore is generally divided into three layers: limonite layer, saprolite layer and transition layer between the two. The chemical composition of laterite ore varies not only from deposit to deposit, but even in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B23/00C22B15/00C22B1/06C22B3/04C22B3/22
CPCC22B23/043C22B1/06C22B23/005
Inventor 邓彤
Owner 邓彤
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