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Method for separating bromine from synergistic smelting ash of circuit boards through roasting with sodium nitrate

A technology of sodium nitrate and circuit board, which is applied in the field of high-efficiency separation and recovery of bromine, can solve the problems of hindering the separation of bromine, failure to use recovery, complex soot metal, etc., achieve high-efficiency separation, and avoid smoke and tail liquid pollution. Effect

Pending Publication Date: 2018-12-21
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large amount of brominated flame retardants in the circuit board, there is a large amount of bromine in the soot, and due to the volatile metals such as lead and zinc, the valuable metals in the soot are complicated and difficult to recover
[0004] Due to the control of the collaborative smelting atmosphere, the co-smelting soot contains cuprous bromide and other substances, which hinder the separation of bromine, so the traditional recovery process cannot be used to effectively recover bromine

Method used

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  • Method for separating bromine from synergistic smelting ash of circuit boards through roasting with sodium nitrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Proceed as follows:

[0022] (1) Mixing material: mix and ball mill the circuit board co-smelting soot and sodium nitrate, and obtain the mixture after ball milling for 1 hour, wherein the mass ratio of sodium nitrate and circuit board co-smelting soot is 1:2;

[0023] (2) Roasting: Roasting the mixture obtained in step (1), at first the mixture is heated up to 350°C at a heating rate of 5°C / min, then to 450°C at a heating rate of 20°C / min, and kept for 1 hour. Obtain roasting flue gas and roasting material;

[0024] (3) The roasted material obtained in step (2) is immersed in water, the solid-to-liquid ratio of the roasted material to water is 1:5 kg / liter, the leaching temperature is 45° C., and the leaching time is 0.5 hour to obtain the leaching residue and leaching solution, leaching residue centralized treatment;

[0025] (4) Deleading and zinc removal: add 98% industrial concentrated sulfuric acid to the water immersion solution obtained in step (3), until the ...

Embodiment 2

[0034] Proceed as follows:

[0035] (1) Mixing material: mix and ball mill the circuit board co-smelting soot and sodium nitrate, and obtain the mixture after ball milling for 2 hours, wherein the mass ratio of sodium nitrate and circuit board co-smelting soot is 1:10;

[0036] (2) Roasting: Roasting the mixture obtained in step (1), at first the mixture is heated up to 350°C at a heating rate of 10°C / min, then to 650°C at a heating rate of 25°C / min, and kept for 3 hours, Obtain roasting flue gas and roasting material;

[0037] (3) The roasted material obtained in step (2) is immersed in water, the solid-to-liquid ratio of the roasted material and water is 1:10 kg / liter in the water immersion process, the leaching temperature is 55 ° C, and the leaching time is 1.5 hours to obtain the leaching residue and leaching solution, leaching residue centralized treatment;

[0038] (4) Deleading and zinc removal: add 98% industrial concentrated sulfuric acid to the water immersion sol...

Embodiment 3

[0047] Proceed as follows:

[0048](1) Mixing material: mix and ball mill the circuit board co-smelting soot and sodium nitrate, and obtain the mixture after ball milling for 1.5 hours, wherein the mass ratio of sodium nitrate and circuit board co-smelting soot is 1:5;

[0049] (2) Roasting: Roasting the mixture obtained in step (1), first the mixture is heated up to 350°C at a heating rate of 8°C / min, and then heated to 550°C at a heating rate of 22°C / min, and kept for 2 hours, Obtain roasting flue gas and roasting material;

[0050] (3) The roasted material obtained in step (2) is immersed in water, the solid-to-liquid ratio of the roasted material and water is 1:8 kg / liter in the water immersion process, the leaching temperature is 50 ° C, and the leaching time is 1 hour to obtain the leaching residue and leaching solution, leaching residue centralized treatment;

[0051] (4) Deleading and zinc removal: add 98% industrial concentrated sulfuric acid to the water immersion ...

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Abstract

The invention provides a method for separating bromine from synergistic smelting ash of circuit boards through roasting with sodium nitrate, belongs to the field of comprehensive recovery of valuableelements from ash through a whole wet method, and particularly relates to a method for efficiently separating and extracting bromine, lead and zinc from synergistic smelting ash of circuit boards through roasting with sodium nitrate. The method mainly comprises the steps of mixing, roasting, step-by-step regulation of pH with industrial sulfuric acid to separate and extract lead and zinc, evaporative crystallization of bromine to recover coarse bromine, smoke treatment and the like. Compared with a traditional ash comprehensive recovery process, oxidization of cuprous bromide and solidification of bromine are achieved through roasting with sodium nitrate, so that conversion and separation of soluble bromine, lead and tin are achieved; a sodium hydroxide and nitric acid system is used for smoke treatment, ash and nitrate generated in the roasting process are recovered to be used repeatedly, and thus, pollution caused by smoke and tail liquid is avoided in the recovery process.

Description

technical field [0001] The invention relates to the field of high-efficiency separation and recovery of bromine by a full-wet method, in particular to a method for separating bromine salt and recovering lead and zinc by a circuit board collaborative smelting soot sodium nitrate roasting method. Background technique [0002] Circuit boards are an important part of electrical and electronic products and the foundation of modern electrical and electronic industries. The basic structure of the circuit board is a copper clad laminate composed of glass fiber reinforced epoxy resin and many metal materials including precious metals. Circuit boards contain a large amount of recyclable resources such as metals. The metals contained in circuit boards, especially precious metal elements, are much higher than the original mineral deposits. The resource recovery and recycling of circuit boards can bring huge economic benefits, which makes circuit boards. Important urban mineral resource...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B7/02C22B13/00C22B19/04C22B19/30C22B11/00C01D3/10C01G9/06C01G21/20
CPCC22B1/02C22B7/006C22B7/02C22B11/044C22B13/045C22B19/04C22B19/30C01D3/10C01G9/06C01G21/20Y02P10/20
Inventor 潘德安吴玉锋
Owner BEIJING UNIV OF TECH
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