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Method of leaching copper in copper containing pyrite using bacteria

A technology for iron ore and pyrite, applied in the field of bacterial leaching of copper in copper-bearing pyrite, can solve the problems of pH drop, copper leaching rate slowdown, sulfur reduction, etc. Quality improvement, high efficiency effect

Inactive Publication Date: 2004-12-22
湖南世纪垠天鑫业科技有限公司
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, some pyrites are fine mud and have poor permeability; some pyrites contain sphalerite in addition to chalcopyrite, and sphalerite often inhibits the process of copper leaching by bacteria. leaching of ore; and because pyrite is the main mineral, its content far exceeds that of copper minerals, usually in the process of bacterial leaching, pyrite is inevitably partially oxidized at the same time, resulting in more acid production in the solution and a sharp drop in pH value, which affects To the activity of copper leaching bacteria, the copper leaching rate slows down; on the other hand, it causes the reduction of sulfur and reduces the sulfur content of pyrite

Method used

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  • Method of leaching copper in copper containing pyrite using bacteria
  • Method of leaching copper in copper containing pyrite using bacteria

Examples

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Embodiment 1

[0032] Example 1 Bacterial Leaching of Copper in Copper-bearing Pyrite

[0033] (1) As a heap, arrange the fine muddy copper-bearing pyrite and the massive copper-bearing pyrite in a ratio of 1:2, and make a pile in layers. The thickness of the fine muddy pyrite layer is 1.5m, and the massive pyrite The thickness of the ore layer is 2.7m; heaped into 600 tons of bacterial leaching heap with an average copper grade of about 0.4%; the heap absorbs water of 38m 3(2) seed culture and leaching solution nutrient preparation mainly cultivate Thiobacillus ferrooxidans, the medium used is the ore pulp of 10% (w / v), add ammonium sulfate 4g / L, dipotassium hydrogen phosphate 0.5g / L, The pH value is 2.0. The preparation of the leaching solution: the addition amount of ammonium sulfate and dipotassium hydrogen phosphate is 5g / L and 0.4g / L respectively, and a small amount of sulfuric acid is added to adjust the pH value to 2.0; during the whole leaching process, the concentration of iron io...

Embodiment 2

[0035] Example 2 Bacterial leaching of copper and zinc in copper-zinc sulfide-containing pyrite

[0036] (1) Make a heap: Pyrite containing copper-zinc sulfide and fine muddy pyrite with an oxidation rate of about 30% and a copper grade of about 0.8% are layered and piled up in a ratio of 1:1; fine muddy pyrite In the upper layer, the copper-zinc sulfide-containing pyrite is in the lower layer, so that sulfuric acid can leach the copper oxide in the upper layer, and the leached copper ions can catalyze the bacterial leaching of zinc in the lower layer, thereby accelerating the bacterial leaching of copper in the copper-zinc sulfide; each layer 2m thick, piled up to 500 tons; (2) Seed bacteria culture and leaching solution nutrient preparation The seed bacteria use Thiobacillus ferrooxidans, Ferrobacterium oxidans, Ferrobacterium thiooxidans, the medium used is 8% (w / v) Add ammonium sulfate 5g / L, dipotassium hydrogen phosphate 0.2g / L, and the pH value is 1.5. For the preparati...

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Abstract

A process for extracting Cu from the Cu-contained pyrite by bacteria features that the electrochemical catalyzing action of bacteria to different sulfide ores is used sufficiently, that is, the low-potential copper sulfide is used as corrosion anode, the high-potential pyrite or gold-silver ore is used as cathode, the bacteria are used to promote the Galvanic ell effect between them, and for the residual pyrite, the special microspirobacteria are used to suppress its oxidization. Its extraction-out rate can reach more than 75% within 4 months.

Description

technical field [0001] The invention relates to a method for leaching copper in copper-containing pyrite ore, in particular to a bacterial leaching method for copper in copper-containing pyrite ore. Background technique [0002] Pyrite is a mineral raw material for chemical companies to make sulfur or sulfuric acid. Pyrite is generally accompanied by about 0.1-1.0% copper. For chemical companies, copper is a harmful impurity element that reduces the quality of pyrite. Sometimes pyrite is difficult to sell or reduce prices because of its high copper content. For non-ferrous enterprises, copper is a valuable metal, and traditional flotation technology can be used to turn harm into benefit and waste into wealth. However, because the copper grade is low, and the copper oxide is generally lost in the flotation tail liquid, the recovery rate is low and the cost is high, so it is difficult to make a profit. [0003] Bacterial leaching technology has t...

Claims

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Application Information

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IPC IPC(8): C22B3/18
CPCY02P10/20
Inventor 张在海
Owner 湖南世纪垠天鑫业科技有限公司
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