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A kind of comprehensive recovery method of waste circuit board smelting soot

A technology of waste circuit boards and recycling methods, applied in the direction of improving process efficiency, etc., can solve problems such as ecological environmental pollution and waste of precious resources, and achieve the effects of improving purity, improving slag properties, and reducing consumption

Active Publication Date: 2021-07-30
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

If discarded circuit boards cannot be properly disposed of, it will not only waste precious resources, but also cause great pollution to the ecological environment

Method used

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  • A kind of comprehensive recovery method of waste circuit board smelting soot
  • A kind of comprehensive recovery method of waste circuit board smelting soot
  • A kind of comprehensive recovery method of waste circuit board smelting soot

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] use figure 1 The method for comprehensively recovering waste circuit board smelting soot as shown includes the following steps:

[0022] Take 500g of smelting soot, and its composition analysis is shown in Table 1.

[0023] Table 1

[0024]

[0025] Mix smelting soot with 100g of NaOH, then add water to adjust the liquid-solid ratio of the reaction system to 2:1, then add the reaction mixture into the autoclave, set the rotation speed at 300rpm, and react at 150°C for 2h. After the reaction, the slurry was filtered to obtain 254.9 g of filter residue and 933.4 mL of filtrate.

[0026] Take 200mL of filtrate, evaporate and crystallize at 100-105°C, and evaporate to dryness to obtain 51.3g of NaCl and NaBr mixed salt.

[0027] Take 100g of filter residue, add 5g of coke, and reduce and roast at 1100°C until no obvious smoke is produced. The produced smoke is collected to obtain 44.1g of crude zinc oxide, which is roasted to obtain calcined sand.

[0028] The calcin...

Embodiment 2

[0031] use figure 1 The method for comprehensively recovering waste circuit board smelting soot as shown includes the following steps:

[0032] Take 500g of smelting soot, and its composition analysis is shown in Table 1.

[0033] Mix smelting soot with 150g of NaOH, then add water to adjust the liquid-solid ratio of the reaction system to 3:1, then add the reaction mixture into the autoclave, set the rotation speed at 300rpm, and react at 180°C for 2h. After the reaction, the slurry was filtered to obtain 248.4 g of filter residue and 1443.2 mL of filtrate.

[0034] Take 200mL of filtrate, evaporate and crystallize at 115-120°C, and evaporate to dryness to obtain 36.6g of NaCl and NaBr mixed salt.

[0035] Take 100g of filter residue, add 8g of coke, and reduce and roast at 1200°C until no obvious smoke is produced. The produced smoke is collected to obtain 44.9g of crude zinc oxide, which is roasted to obtain calcined sand.

[0036] The calcined sand is then reduced and s...

Embodiment 3

[0039] use figure 1 The method for comprehensively recovering waste circuit board smelting soot as shown includes the following steps:

[0040] Take 500g of smelting soot, and its composition analysis is shown in Table 2.

[0041] Table 2

[0042]

[0043] Mix smelting soot with 120g of NaOH, then add water to adjust the liquid-solid ratio of the reaction system to 2.5:1, then add the reaction mixture into the autoclave, set the rotation speed at 300rpm, and react at 200°C for 2h. After the reaction, the slurry was filtered to obtain 278.3 g of filter residue and 1213.4 mL of filtrate.

[0044] Take 200mL of filtrate, evaporate and crystallize at 95-100°C, and evaporate to dryness to obtain 30.8g of NaCl and NaBr mixed salt.

[0045] Take 100g of filter residue, add 10g of coke, and reduce and roast at 1000°C until no obvious smoke is produced. The produced smoke is collected to obtain 47.0g of crude zinc oxide, which is roasted to obtain calcined sand.

[0046] The cal...

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Abstract

The invention belongs to the technical field of solid waste treatment, and specifically discloses a comprehensive recovery method for smelting soot from waste circuit boards. In this recovery method, alkali is first added to smelting soot for pressure leaching, and metal bromide and chloride salts in the soot are converted into hydroxide precipitates, while bromine and chlorine are converted into soluble NaBr and NaCl respectively, realizing bromine, Chlorine is separated from valuable metals, and then the filtrate is evaporated and crystallized to obtain crude salt products. The filter residue is reduced and roasted, and the zinc in the residue is recovered through volatilization to obtain a higher-purity zinc oxide product. After that, the calcined sand is further heated and smelted to obtain metal Ingots and harmless reducing slag. The method for comprehensively recovering waste circuit board smelting soot provided by the invention can effectively recover bromine, chlorine and valuable metals in waste circuit board smelting soot.

Description

technical field [0001] The invention relates to the technical field of solid waste treatment, in particular to a method for comprehensive recovery of waste circuit board smelting soot. Background technique [0002] With the rapid expansion and replacement of electronic products, the accumulation of waste electrical and electronic equipment has increased significantly. Globally, about 35 million tons of electronic waste are produced every year, and the total amount of electronic waste is also increasing sharply at a rate of about 4% per year. Waste circuit boards are about 3% of the total electronic waste. Waste circuit boards contain about 61% metal and 21% plastic. Metals mainly include basic metals such as aluminum, copper, iron, nickel, lead, tin and zinc, and Gold, silver, rhodium, selenium and other precious metals and rare metals, plastics mainly include glass fiber reinforced phenolic resin or epoxy resin, and also contain a part of flame retardant. Therefore, disca...

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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