Method for extracting nickel and cobalt through granulating and heap-leaching laterite nickel ore

A lateritic nickel ore and heap leaching technology, applied in the direction of improving process efficiency, etc., can solve the problems of ore heap knotting, high mud content, affecting the infiltration rate of ore heap and oxygen ventilation, etc., and achieve the effect of less investment in equipment

Inactive Publication Date: 2011-09-07
有研资源环境技术研究院(北京)有限公司
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  • Summary
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] Due to the low nickel grade and high degree of oxidation of laterite nickel ore, there are more fine ore and high mud content, which affects the permeability and oxygen flow of the ore heap.
Direct heap leaching causes the ore heap to freeze, and the lower ore cannot be leached

Method used

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  • Method for extracting nickel and cobalt through granulating and heap-leaching laterite nickel ore
  • Method for extracting nickel and cobalt through granulating and heap-leaching laterite nickel ore
  • Method for extracting nickel and cobalt through granulating and heap-leaching laterite nickel ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The chemical composition of laterite nickel ore is shown in Table 1:

[0037] Table 1 Results of multi-element chemical analysis of laterite nickel ore

[0038] sample name

[0039] The process conditions and main technical indicators of lateritic nickel ore granulation heap leaching are shown in Table 2.

[0040] Table 2 Process conditions and main technical indicators of heap leaching of lateritic nickel ore granulation 1

[0041] project name

[0042] Note*: The binder is a mixture of sodium humate and water glass, and the ratio of the two is 1:5 to 1:10% (weight ratio). Same below

Embodiment 2

[0044] The chemical composition of laterite nickel ore is identical with embodiment 1.

[0045] The process conditions and main technical indicators of lateritic nickel ore granulation heap leaching are shown in Table 3.

[0046] Table 3 Process conditions and main technical indicators of heap leaching of lateritic nickel ore granulation 2

[0047] project name

Embodiment 3

[0049] The chemical composition of laterite nickel ore is identical with embodiment 1. The difference is that a fiber penetration aid is added during granulation, and the fiber penetration aid is a plastic braided belt or the like.

[0050] The process conditions and main technical indicators of lateritic nickel ore granulation heap leaching are shown in Table 4.

[0051] Table 4 Process conditions and main technical indicators of lateritic nickel ore granulation heap leaching 3

[0052]

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Abstract

The invention provides a method for extracting nickel and cobalt through granulating and heap-leaching laterite nickel ores. The method comprises the following steps of: firstly, breaking and screening raw ores to granulate until the ore is made into 100-mesh; secondly, granulating and curing: adding a binder and sulfuric acid solution according to a certain proportion to granulate in a disc granulator, wherein the compound binder is a mixture of sodium humate and water glass, the adding amount is 1-5% of the amount of core, the concentration of sulfuric acid is 5-10% so that the water content of the aggregate reaches 10-16%, and the granularity of the aggregate is 5-20mm; and in order to ensure that the aggregate has proper wet strength, the prepared aggregate is cured before heaping; thirdly, constructing heaps, and fourthly, spraying: spraying circularly or dropwise according to 3-20% of acid concentration and 5-80L / m<2>.h of spraying strength; and when the concentration of a nickel ion in lixivium reaches 1-3g / L and iron ion reaches 10-30g / L, taking out the acid to obtain the lixivium containing nickel and cobalt. The invention has simple and convenient technique, short process, small investment, low energy consumption, favorable ore-penetration and higher nickel and cobalt leaching efficiencies.

Description

technical field [0001] The invention relates to a method for extracting nickel and cobalt from laterite nickel ore granulation and heap leaching. Background technique [0002] The world's land-based nickel reserves are about 470 million tons, of which 39.4% exist in the form of sulfide ore, and 60.6% exist in the form of oxide ore. Now about 70% of nickel in the world is extracted from sulfide ore. With the development of the world economy, the demand for nickel increases, but the nickel sulfide ore resources that can be used economically are increasingly exhausted. It is more attractive to extract nickel and cobalt from nickel oxide ore. People are more attracted to nickel oxide ore (laterite nickel ore) attention is also increasing. [0003] Laterite nickel deposits are nickel-containing deposits that have undergone large-scale and long-term weathering in tropical or subtropical regions. Due to the oxidation of iron, the ore is red, so it is collectively called lateritic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B23/00C22B3/08
CPCY02P10/20
Inventor 郑其车小奎段锦韩利生
Owner 有研资源环境技术研究院(北京)有限公司
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