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Method for recycling bromine in electronic waste smelting smoke dust through wet-process alkaline system

An electronic waste, alkaline technology, applied in the direction of bromine, bromine/hydrogen bromide, etc., can solve the problems of difficult, efficient and green processing

Active Publication Date: 2020-05-19
CHINA NERIN ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the bromine in the dust is combined with copper, lead, zinc, tin, gold, silver and other metal elements in the form of compounds, and it is difficult for conventional processes to treat such materials efficiently and greenly.
[0006]Therefore, the existing method of recovering and extracting bromine from electronic waste smelting fumes needs to be further improved

Method used

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  • Method for recycling bromine in electronic waste smelting smoke dust through wet-process alkaline system
  • Method for recycling bromine in electronic waste smelting smoke dust through wet-process alkaline system
  • Method for recycling bromine in electronic waste smelting smoke dust through wet-process alkaline system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042](1) Composition (%) on a dry basis of smelting dust from an electronic waste: F 0.16, Cl 7.85, Br 9.13, Cu 20.81, Zn9.91, Pb 8.83, Sn 2.90.

[0043] (2) The smelting fume is dry-milled for 30 minutes according to the ball-to-material mass ratio of 4:1 and the speed of 450r / min; add 2mol / LNH 4 OH solution, the ratio of liquid to solid is 3:1, the temperature of 40°C is passed through excess air and the reaction is stirred for 100 minutes, the leaching rate of bromine is 94.1%.

Embodiment 2

[0045] (1) Composition (%) on a dry basis of smelting fumes from a certain electronic waste: the same as in Example 1.

[0046] (2) The smelting fumes are subjected to dry ball milling for 30 minutes according to the mass ratio of balls to materials at 3:1 and the rotating speed at 500r / min; add 1mol / LNa 2 CO 3 The solution has a liquid-to-solid ratio of 3:1. Excessive air is passed through at a temperature of 40°C and stirred for 120 minutes. The leaching rate of bromine is 98.1%.

Embodiment 3

[0048] (1) Composition (%) on a dry basis of smelting fumes from a certain electronic waste: the same as in Example 1.

[0049] (2) The smelting dust is dry-milled for 10 minutes according to the mass ratio of the ball to material at 4:1, and the speed is 600r / min; add 1.0mol / L NaOH solution, the liquid-solid ratio is 4:1, and the temperature is 40°C. Excess air was stirred and reacted for 100 minutes, and the leaching rate of bromine was 99.1%.

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Abstract

The invention discloses a method for recovering bromine in electronic waste smelting smoke dust by a wet alkaline system. The method comprises the following steps: carrying out dry ball milling on electronic waste smelting smoke dust to obtain ball-milled smoke dust; leaching the ball-milled smoke dust with an alkali liquor with a concentration of 1-5 mol / L according to a liquid-solid ratio of 1:(1-4) so as to obtain a leachate; and carrying out liquid-solid separation on the leachate, and carrying out evaporative crystallization on the obtained leachate to obtain a bromine salt or finely extracting bromine to obtain a liquid bromine product. The method has the advantages of high recovery efficiency, low cost, short flow and the like.

Description

technical field [0001] The invention belongs to the field of electronic waste smelting smoke and dust treatment, in particular, the invention relates to a method for recovering bromine in electronic waste smelting smoke and dust in a wet alkaline system. Background technique [0002] The comprehensive utilization of electronic waste has both environmental and economic benefits. At present, the recycling, dismantling and processing system of electronic waste in my country has been gradually improved. The use of pyrotechnics to treat electronic waste has the advantages of high efficiency and good benefits, and is being widely concerned and promoted. [0003] Electronic waste also contains valuable metal components such as copper, lead, zinc, tin, gold, and silver, as well as organic components such as flame retardants, plastics, and organic resins. During the pyroprocessing process, a high-metal, high-halogen content smelting fume is generated. The elemental composition and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B7/09
CPCC01B7/096Y02P10/20
Inventor 刘志宏夏隆巩纪宏巍曹自喜郭萌张剑蔡加武郭方颖邱士伟刘志东吴鸽鸣叶逢春王红军
Owner CHINA NERIN ENG
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