Aspergillus niger granulating and leaching method of copper tailings

A technology for making Aspergillus niger and copper tailings, which is applied in the direction of improving process efficiency and can solve problems such as the influence of ore particle stability, contact reaction hindrance, multiple energy sources and materials, and achieve easy solid-liquid separation, fast leaching speed, The effect of short process flow

Inactive Publication Date: 2015-11-11
NANHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these traditional granulation methods have the following disadvantages: firstly, the binder has a certain hindering effect on the contact reaction between the leaching agent and the ore; secondly, if lime is added as the binder, the acid consumption will be increased, and even the ore produced impact on the stability of granules; again, the use of the above granulation technology requires more energy and material consumption, which increases production costs

Method used

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  • Aspergillus niger granulating and leaching method of copper tailings
  • Aspergillus niger granulating and leaching method of copper tailings
  • Aspergillus niger granulating and leaching method of copper tailings

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Take 5g copper tailings ore powder and place it in 100mL Aspergillus niger culture medium, inoculate 0.02% Aspergillus niger spore suspension (OD 600 =1.0) and then placed in a constant temperature culture shaker for leaching, the temperature of the shaker culture was controlled at 20°C, and the rotation speed was 200r / min. Mycelial balls wrapped with copper tailings appeared after 72 hours of culture, and the mycelial balls gradually increased with the extension of culture time. After 7 days of leaching, the average diameter of mycelial balls covering the tailings was 3.15mm, and the viscosity of the leachate was 1.15cP. The solid-liquid separation was carried out by funnel filtration, the copper content in the slag sample was measured, and the copper leaching rate was calculated to be 82.36%.

Embodiment 2

[0037] Take 5g copper tailings ore powder and place it in 100mL Aspergillus niger culture medium, inoculate 0.02% Aspergillus niger spore suspension (OD 600 =1.0) and then placed in a constant temperature culture shaker for leaching, the temperature of the shaker culture was controlled at 25°C, and the rotation speed was 200r / min. Mycelial balls wrapped with copper tailings appeared after 60 hours of culture, and the mycelial balls gradually increased with the extension of culture time. After 7 days of leaching, the average diameter of mycelial balls wrapped with copper tailings was 3.05 mm, and the viscosity of the leachate was 1.12 cP. After the slag was digested, the copper content in the slag sample was measured and the leaching rate of copper was calculated to be 86.18%.

Embodiment 3

[0039] Take 5g copper tailings ore powder and place it in 100mL Aspergillus niger culture medium, inoculate 0.02% Aspergillus niger spore suspension (OD 600 =1.0) and then placed in a constant temperature cultivating shaker for leaching, the temperature of the shaker was controlled to be 25°C, and the rotating speed was 120r / min. Mycelial balls wrapped with copper tailings appeared after 60 hours of culture, and the mycelial balls gradually increased with the extension of culture time. After 7 days of leaching, the average diameter of mycelial balls wrapped with copper tailings was 7.36 mm, and the viscosity of the leachate was 1.18 cP. After the slag was digested, the copper content in the slag sample was measured and the leaching rate of copper was calculated to be 75.39%.

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Abstract

The invention relates to a microbial ore leaching method for simultaneously granulating and leaching copper tailings by using Aspergillus niger. Aspergillus niger and the copper tailings are co-cultured to make Aspergillus niger hyphae wrap the copper tailings in order to granulate and leach copper in the copper tailings. The method for granulating and leaching ores by using Aspergillus niger provides leaching microenvironment, and a small closed space is formed in a copper tailing-Aspergillus niger spherical particle, so hyphae in the particle have full contact with the copper tailings, and the mechanical fragmentation of the copper tailings is enhanced, thereby copper leaching is accelerated. The method disclosed in the invention solves difficulty solid-liquid separation of traditional stirring leaching and the problems of obstruction of contact of a leaching agent with the ores by a binder, large acid consumption, large energy and material consumption and large environment harms of traditional granulation leaching, reduces the granulation cost, shortens the technologic cycle, and is also suitable for granulating and leaching of uranium, gold, cobalt, nickel, lead, zinc and rare earth elements.

Description

technical field [0001] The invention relates to a microbial leaching method for simultaneous granulation and leaching of copper tailings by using Aspergillus niger. Background technique [0002] Tailings contain a large amount of available metals and are an important potential resource. The idle and unreasonable disposal of a large amount of tailings will not only cause waste of resources, but also have a huge impact on the ecological environment of the mine and its surroundings. Therefore, it is of great significance to use effective methods to extract valuable metals in order to reduce the waste of resources and promote the secondary utilization of tailings. Copper recovery technologies from copper tailings mainly include flotation, acid leaching, ammonia leaching, hydrothermal vulcanization-flotation process, pressurized ammonia leaching vulcanization precipitation, autotrophic bacteria leaching and other processes. However, there are also problems such as large equipme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/18C22B15/00
CPCY02P10/20
Inventor 李广悦丁德馨刁宁宁王永东胡南张振远杜康
Owner NANHUA UNIV
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