A method for harmless recovery of waste circuit board smelting soot

A technology of discarded circuit boards and recycling methods, applied in the direction of improving process efficiency, etc., can solve problems such as circuit board waste, achieve the effects of improving the properties of slag, reducing metal loss, and improving purity

Active Publication Date: 2021-07-16
INST OF RESOURCES UTILIZATION & RARE EARTH DEV GUANGDONG ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, about 30%-50% of circuit board waste is formed during the circuit board production process

Method used

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  • A method for harmless recovery of waste circuit board smelting soot
  • A method for harmless recovery of waste circuit board smelting soot
  • A method for harmless recovery of waste circuit board smelting soot

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] use figure 1 The shown harmless recovery method of waste circuit board smelting soot is to process the waste circuit board smelting soot, including the following steps:

[0023] Take 500g of smelting soot, and its composition analysis is shown in Table 1.

[0024] Table 1

[0025]

[0026] The smelted soot is roasted with alkali, the alkali used is NaOH, 100g of NaOH is added to the soot, mixed evenly, and put into a corundum crucible. The crucible was placed in a muffle furnace and calcined at 500°C for 3 hours. After calcining, the material was taken out, totaling 467.3g.

[0027] Weigh 200g of roasted soot and add it to a stirring tank, add 600mL of water to the tank, adjust the rotation speed to 300rpm, react at room temperature for 2h, and filter to obtain 587.2mL of filtrate and 120.8g of filter residue after the reaction.

[0028] Take 200mL of the filtrate, evaporate and crystallize at an evaporation temperature of 95-100°C, and evaporate to dryness to obt...

Embodiment 2

[0033] use figure 1 The shown harmless recovery method of waste circuit board smelting soot is to process the waste circuit board smelting soot, including the following steps:

[0034] Take 500g of smelting soot, and its composition analysis is shown in Table 1.

[0035] The smelting soot is roasted with alkali, and the alkali used is Na 2 CO 3 , add 130g of Na to the soot 2 CO 3 , and put it into a corundum crucible after mixing evenly. The crucible was placed in a muffle furnace and calcined at 800°C for 2 hours. After calcining, the material was taken out, totaling 483.6g.

[0036] Weigh 200g of roasted soot, put it into the stirring tank, add 400mL of water into the tank, adjust the rotation speed to 300rpm, react at room temperature for 3h, filter after the reaction to obtain 387.4mL of filtrate and 127.2g of filter residue.

[0037] Take 200mL of filtrate, evaporate and crystallize at 105-110°C, and evaporate to dryness to obtain 33.8g of NaCl and NaBr mixed salt. ...

Embodiment 3

[0042] use figure 1 The shown harmless recovery method of waste circuit board smelting soot is to process the waste circuit board smelting soot, including the following steps:

[0043] Take 500g of smelting soot, and its composition analysis is shown in Table 1.

[0044] The smelting soot is roasted with alkali, the alkali used is NaOH, 120g of NaOH is added to the soot, mixed evenly, and put into a corundum crucible. The crucible was placed in a muffle furnace and calcined at 600°C for 4 hours. After calcining, the material was taken out, totaling 487.1g.

[0045] Weigh 200g of roasted soot and add it to a stirring tank, add 800mL of water to the tank, adjust the rotation speed to 300rpm, react at room temperature for 2h, and filter to obtain 784.2mL of filtrate and 109.8g of filter residue after the reaction.

[0046] Take 200mL of filtrate, evaporate and crystallize at 115-120°C, and evaporate to dryness to obtain 32.9g of NaCl and NaBr mixed salt.

[0047] Take 100g of ...

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Abstract

The invention belongs to the technical field of solid waste treatment, and specifically discloses a harmless recycling method for smelting soot from waste circuit boards. The recovery method first adds alkali to the smelting soot for roasting, and converts the metal bromide and chloride salts in the soot into water-insoluble metal oxides, and the bromine and chlorine elements form water-soluble sodium bromide and sodium chloride, and the soot after roasting After water immersion and filtration, the separation of bromine, chlorine and valuable metals is realized. Bromine and chlorine mainly enter the solution, and then the crude salt product is obtained through evaporation and crystallization, and then the filter residue is reduced and roasted, and the zinc element in the residue is recovered by volatilization. , to obtain a higher purity zinc oxide product, and then the calcine is further heated and smelted, and the metal oxide is reduced to produce metal ingots and harmless reduction slag. The waste circuit board smelting soot treatment method provided by the invention can effectively separate bromine and chlorine in the waste circuit board smelting soot, and can simultaneously remove organic matter in the soot, and effectively recover bromine, chlorine and valuable metals.

Description

technical field [0001] The invention relates to the technical field of solid waste treatment, in particular to a harmless recycling method for smelting soot from waste circuit boards. Background technique [0002] As an important part of electronic products, circuit boards are widely found in a large amount of electronic waste. In addition, approximately 30%-50% of circuit board waste is formed during circuit board production. As a big country in the production and consumption of electronic products, my country produces at least hundreds of thousands of tons of waste circuit boards every year. Waste circuit boards mainly contain non-metallic materials such as glass fiber, epoxy resin, and plastic, as well as metal materials such as iron, nickel, lead, tin, zinc, gold, silver, and rhodium. [0003] At present, the treatment technologies for waste circuit boards mainly include pyrolysis technology, hydrometallurgy technology, supercritical fluid technology, microbial technol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/02C22B1/02C22B13/02C22B15/00C22B19/34C22B25/02C22B25/06
CPCC22B1/02C22B7/008C22B7/02C22B13/025C22B15/0056C22B19/34C22B25/02C22B25/06Y02P10/20
Inventor 刘勇吕建芳刘牡丹陈志强吕先谨马致远刘超
Owner INST OF RESOURCES UTILIZATION & RARE EARTH DEV GUANGDONG ACAD OF SCI
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