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Waste circuit board smelting soot reinforced alkaline leaching debromination recovery method

A technology of waste circuit boards and recycling methods, which is applied in the direction of improving process efficiency, etc., to achieve the effects of shortening reaction time, simple equipment, and green and efficient separation effect

Active Publication Date: 2020-01-24
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is mainly to solve the problem of high-efficiency green recovery of bromide in waste circuit board smelting soot, and propose a method of using microwave / ultrasonic / electric field to assist waste circuit board smelting soot to strengthen alkali leaching, neutralization and impurity removal, concentration-freeze crystallization desulfurization and evaporative crystallization

Method used

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  • Waste circuit board smelting soot reinforced alkaline leaching debromination recovery method

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Experimental program
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Effect test

Embodiment 1

[0019] Follow the steps below to recycle:

[0020] (1) Enhanced alkali leaching: Put the waste circuit board smelting soot into the sodium hydroxide solution to obtain a mixed solution, wherein the concentration of the sodium hydroxide solution is 10%, and the solid-to-liquid ratio of the soot to the sodium hydroxide solution is 1:2g / mL, The obtained mixed solution is placed in a microwave reactor, 5 mL of hydrogen peroxide is added to each liter of the mixed solution, heated by 1000 MHz microwave, the microwave power is 200 W per liter of the mixed solution, and the microwave leaching time is 35 minutes. Alkali leaching residue, centralized treatment of alkali leaching residue;

[0021] (2) Neutralization and removal of impurities: the alkaline leaching solution obtained in step (1) is neutralized and removed to obtain neutralized slag and liquid after removal of impurities, and industrial concentrated sulfuric acid is added to adjust the pH to 7.5, and the reaction temperatu...

Embodiment 2

[0027] Follow the steps below to recycle:

[0028] (1) Enhanced alkali leaching: put the waste circuit board smelting soot into the sodium hydroxide solution to obtain a mixed solution, wherein the concentration of the sodium hydroxide solution is 50%, and the solid-to-liquid ratio of the soot to the sodium hydroxide solution is 1:6g / mL, The obtained mixed solution is placed in an ultrasonic reactor, 10 mL of hydrogen peroxide is added to each liter of the mixed solution, and 20 kHz ultrasonic treatment is adopted, the ultrasonic power is 1250 W per liter of the mixed solution, and the ultrasonic leaching time is 45 minutes. Alkali leaching residue, centralized treatment of alkali leaching residue;

[0029] (2) Neutralize and remove impurities: neutralize and remove impurities from the alkaline immersion solution obtained in step (1), obtain neutralized slag and liquid after removing impurities, add industrial concentrated sulfuric acid to adjust the pH to 8.5, and the reactio...

Embodiment 3

[0035] Follow the steps below to recycle:

[0036] (1) Enhanced alkali leaching: put the waste circuit board smelting soot into the sodium hydroxide solution to obtain a mixed solution, wherein the concentration of the sodium hydroxide solution is 20%, and the solid-to-liquid ratio of the soot to the sodium hydroxide solution is 1:3g / mL, The obtained mixed solution was placed in a constant temperature water bath, and 6 mL of hydrogen peroxide was added to each liter of the mixed solution, and the quaternary alloy electrode (Pb-Ag-Ca-Sr) was inserted into the mixed solution as the cathode and anode plates, and the distance between the cathode and anode plates was 4cm, connected to the power supply and mechanically stirred, the current density is 300A / m 2 Stir, the reaction temperature is 90°C, and the reaction time is 100 minutes. After the reaction is completed, filter to obtain the alkali leaching solution and alkali leaching residue, and concentrate the alkali leaching resid...

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Abstract

The invention provides a waste circuit board smelting soot reinforced alkaline leaching debromination recovery method, belongs to the field of bromine-containing smelting sootwhole-wet efficient and green bromide removal and particularly relates to a method for converting, debrominating and separating cuprous bromide in smelting soot in a waste circuit board melting tank through reinforced alkaline leaching. The method comprises the main following steps of reinforced alkaline leaching, neutralization and impurity removal, concentration-freezing crystallization and desulfuration, cold water washing and evaporative crystallization. Compared with the traditional alkaline leaching technology, the recovery method has the advantages that through the electric field / ultrasonic / microwave and otherreinforcement means, the crystalline structure of CuBr is further destroyed, fracture of a chemical bond is accelerated, the mass transfer effect is improved, the reaction activation energy is reduced, the reaction time is shortened, energy consumption is reduced, and the debromination rate is increased. The recovery method has the characteristics of being simple in process, easy to implement, green and free of pollution in the recovery process, efficient, energy-saving, free of tail gas and tail liquid emissions and the like.

Description

technical field [0001] The invention relates to the field of high-efficiency and green removal of bromide in smelting soot, in particular to a method for smelting soot cuprous bromide in a melting pool of waste lines and strengthening alkali leaching debromination. Background technique [0002] Waste circuit boards are the most valuable and difficult components in waste electronic appliances, and their disposal is the core of high-value utilization of electronic appliances. The mainstream technologies for waste circuit board disposal such as "mechanical crushing of waste circuit boards-gravity sorting", "multi-metal powder smelting and electrolysis" have been promoted and applied nationwide. The technology is very mature, but there is a secondary hazardous waste utilization rate of resin powder. Low, low metal recovery rate (≤95%) and other issues. In recent years, taking advantage of the advantages of molten pool smelting in co-processing organic matter, developed countrie...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B13/00C22B19/30C22B19/20
CPCC22B7/008C22B13/045C22B19/24C22B19/30Y02P10/20
Inventor 潘德安刘功起吴玉锋李彬
Owner BEIJING UNIV OF TECH
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