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Method for purifying sodium bromide by utilizing waste circuit board pyrolysis coke

A technology for waste circuit boards and sodium bromide is applied in the field of crude bromide salts to achieve the effects of simple and easy process, environmental friendliness and high resource utilization rate

Inactive Publication Date: 2020-04-10
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is mainly to solve the problem of high-value utilization of waste circuit board smelting and thermal cracking residues, and propose a new method of using coke in the waste circuit board cracking slag to reduce the crude bromine salt enriched in waste circuit board smelting soot , realizing the resource coupling and integrated utilization of two wastes, with the characteristics of simple and easy process, high resource utilization rate, and environmental friendliness

Method used

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  • Method for purifying sodium bromide by utilizing waste circuit board pyrolysis coke
  • Method for purifying sodium bromide by utilizing waste circuit board pyrolysis coke
  • Method for purifying sodium bromide by utilizing waste circuit board pyrolysis coke

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Effect test

Embodiment 1

[0019] Follow the steps below to recycle:

[0020] (1) Carbonization conversion: mix the crude bromine salt enriched from waste circuit board smelting soot with the coke separated from the waste circuit board pyrolysis slag, mix evenly and heat the reaction to obtain carbon monoxide and crude sodium bromide, carbon monoxide Collect raw materials for making water gas, wherein the mass of coke added per kilogram of crude bromine salt is 0.1kg, the reaction temperature is 250°C, and the reaction time is 1.0h;

[0021] (2) Purification and filtration: the thick sodium bromide obtained in step (1) is added into distilled water for purification and filtration to obtain impurity slag and sodium bromide solution, and the impurity slag is treated centrally, wherein the liquid-solid volume mass ratio is 8:1 (liter / kg), the reaction temperature is 50°C, and the reaction time is 20min;

[0022] (3) vacuum precipitating: the sodium bromide solution that step (2) obtains is carried out va...

Embodiment 2

[0025] Follow the steps below to recycle:

[0026] (1) Carbonization conversion: mix the crude bromine salt enriched from waste circuit board smelting soot with the coke separated from the waste circuit board pyrolysis slag, mix evenly and heat the reaction to obtain carbon monoxide and crude sodium bromide, carbon monoxide Collect raw materials for making water gas, wherein the mass of coke added per kilogram of crude bromine salt is 1.0 kg, the reaction temperature is 450 ° C, and the reaction time is 2.0 h;

[0027] (2) Purification and filtration: the thick sodium bromide obtained in step (1) is added into distilled water for purification and filtration to obtain impurity slag and sodium bromide solution, and the impurity slag is treated centrally, wherein the liquid-solid volume mass ratio is 3:1 (liter / kg), the reaction temperature is 80°C, and the reaction time is 60min;

[0028] (3) vacuum precipitating: the sodium bromide solution that step (2) obtains is carried ou...

Embodiment 3

[0031] Follow the steps below to recycle:

[0032] (1) Carbonization conversion: mix the crude bromine salt enriched from waste circuit board smelting soot with the coke separated from the waste circuit board pyrolysis slag, mix evenly and heat the reaction to obtain carbon monoxide and crude sodium bromide, carbon monoxide Collect raw materials for making water gas, wherein the mass of coke added per kilogram of crude bromine salt is 0.4 kg, the reaction temperature is 300°C, and the reaction time is 1.2h;

[0033] (2) purification filtration: the thick sodium bromide that step (1) obtains is added distilled water and carry out purification filtration, obtain impurity slag and sodium bromide solution, impurity slag centralized treatment, wherein liquid-solid volume mass ratio is 7: 1 (liter / kg), the reaction temperature is 60°C, and the reaction time is 25min;

[0034] (3) vacuum precipitating: the sodium bromide solution that step (2) obtains is carried out vacuum precipit...

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Abstract

The invention provides a method for purifying sodium bromide by utilizing waste circuit board pyrolysis coke, belongs to the field of sodium bromide purification and high-value utilization, and particularly relates to a method of utilizing waste circuit board pyrolysis coke to achieve reduction and purification of coarse bromide obtained from waste circuit board smelting soot. The method mainly includes carbonization conversion, purification filtration and vacuum desolvation. Compared with the prior art, the novel method of utilizing the coke in waste circuit board pyrolysis slag to reduce thecoarse bromide enriched from waste circuit board smelting soot is adopted to obtain purified sodium bromide crystals, resource coupling and high-value utilization of two waste materials are achieved,and secondary pollution in a recovery process of waste circuit boards is avoided. The method is simple and feasible in process, high in resource utilization rate, free of tail liquid emission, and the like.

Description

technical field [0001] The present invention relates to the recycling technology of co-processing and high-value utilization of waste circuit board smelting and pyrolysis residues, and in particular relates to the use of coke in the waste circuit board pyrolysis slag to reduce the crude bromine salt obtained from waste circuit board smelting soot enrichment A whole new approach. 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 current mainstream treatment methods are physical separation, pyrolysis and wet treatment, as well as the gradually developed biological treatment technology. The treatment characteristics of these recycling technologies are shown in Table 1. Among them, physical separation can obtain the enrichment of metals and non-metals. Hydrometallurgy and biometallurgy mostly focus on the recovery...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/10C01D3/14
CPCC01D3/10C01D3/14C22B1/06C22B26/10Y02P10/20C01D3/18
Inventor 吴玉锋刘功起潘德安
Owner BEIJING UNIV OF TECH
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