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A two-step bioleaching method and device for full value recovery of valuable metals in waste circuit boards

A technology for waste circuit boards and valuable metals, which is applied in the field of solid waste recycling and can solve the problems of low efficiency of valuable metals

Active Publication Date: 2019-01-11
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the low efficiency of the existing biological leaching of high content of valuable metals in waste circuit boards and the defects and deficiencies of leaching microorganisms in leaching metals, and to provide a full-value recycling of valuable metals in waste circuit boards. Two-step bioleaching method and apparatus for metals

Method used

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  • A two-step bioleaching method and device for full value recovery of valuable metals in waste circuit boards
  • A two-step bioleaching method and device for full value recovery of valuable metals in waste circuit boards
  • A two-step bioleaching method and device for full value recovery of valuable metals in waste circuit boards

Examples

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Embodiment 1

[0052] Example 1 A full-value recovery device for valuable metals in waste circuit boards

[0053] A full-value recovery device for valuable metals in waste circuit boards, comprising a non-ferrous metal leaching reactor 1, a reduction tank 2, a sedimentation tank 3, and a precious metal leaching reactor 4; the non-ferrous metal leaching reactor 1 is divided into upper and lower layers , the lower layer is an aerobic zone 11 for cultivating ore leaching microorganisms, the upper layer is a reaction zone 13 for leaching nonferrous metals, and a diaphragm layer 12 with a pore size of 5 μm is arranged between the upper and lower layers; the reaction zone 13 and the reduction pool 2 It is connected to the sedimentation tank 3 in sequence, and is connected to the precious metal leaching reactor 4 respectively; the device also includes a non-ferrous metal recovery tank 5 connected to the sedimentation tank 3, and a precious metal recovery tank 6 connected to the precious metal leachi...

Embodiment 2

[0059] Example 2 A two-step bioleaching method for full value recovery of valuable metals in waste circuit boards

[0060] A two-step bioleaching method for full value recovery of valuable metals in waste circuit boards, comprising the following steps:

[0061] 1. Remove the components on the waste circuit board substrate, use a freeze pulverizer to crush, and use flotation technology to sort the obtained powder to obtain metal components and non-metal components, and screen the metal components to obtain metal coarse particles and metal fine particles. particles.

[0062] 2. Sampling from the copper mine area for enrichment, screening, domestication, separation and purification, domestication, and breeding of leaching microorganisms to obtain 2+ The strain Leptospira ferrophilum with high tolerance to metal ions ( Leptospirillum ferriphilum ). Add Cu respectively to the medium used 2+ , Pb 2+ 、Al 3+ , Zn 2+ By measuring the oxidation rate of ferrous iron per unit vol...

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Abstract

The invention discloses a two-step biological leaching method for full-value recycling of valuable metals in a waste circuit board. The two-step biological leaching method comprises the following steps that S1, pretreatment is conducted, specifically, the waste circuit board is smashed and then sorted, and thus metal particles are obtained; S2, leaching of the non-ferrous metals is conducted, specifically, an ore-leaching microorganism is cultured in a culture medium containing Fe2+, so that Fe2+ is converted into Fe3+, then Fe3+ reacts with the metal particles in the step S1, and thus non-ferrous metal leachate and precious metal residues are obtained; S3, leaching of precious metals is conducted, specifically, the precious metal residues in the step S2 react with a precious metal leaching agent solution formed by the mode that lime water absorbs HCN, and thus precious metal leachate is obtained; and S4, the non-ferrous metal leachate in the step S2 and the precious metal leachate inthe step S3 are extracted and recycled correspondingly. By adopting a two-step leaching process, full-value extraction of the non-ferrous metals in the waste circuit board can be achieved, and an environment-friendly technological scheme is provided for recycling of the metals in the waste circuit board.

Description

technical field [0001] The invention belongs to the field of solid waste recycling, and relates to a two-step bioleaching method and device for recovering valuable metals in waste circuit boards at full value. Background technique [0002] Electronics are one of the fastest growing products of the 21st century. With the development and innovation of science and technology, the update speed of electronic products is getting faster and faster, and the service life will be shortened accordingly, which will make the amount of electronic waste increase linearly. As the core component of electronic and electrical products, the circuit board contains dozens or even hundreds of times of valuable metals than natural mineral deposits. Professional recycling of them can avoid the pollution caused by random discarding, and can also reuse resources, which has the dual value of environmental protection and resource recycling. [0003] At present, there are mainly physical, chemical and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B3/18
CPCC22B3/18C22B7/006Y02P10/20
Inventor 阮菊俊袁志辉黄哲黄佳欣秦保家仇荣亮
Owner SUN YAT SEN UNIV