Processing method for waste liquid from stripping tin scolding

A treatment method and waste liquid technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve problems such as environmental impact, waste, and comprehensive utilization of unfavorable resources, and achieve process The process is reasonable and practical, reducing waste and reducing pollution

Active Publication Date: 2013-04-10
JIANGXI GREEN ECO MFG RESOURCE CYCLE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the heavy metals such as lead, tin, iron, and copper contained in these desoldering waste liquids, as well as their strong acidity and strong oxidative properties, if they are not handled properly, they will have a great impact on the environment and are not conducive to the comprehensive utilization of resources.
[0003] The solder stripping solution is generally composed of a certain concentration of nitric acid, oxidizing agents (such as ferric chloride), and other co-solvents. After several cycles, due to the decrease in acidity, weakening of oxidation, and increase in the concentration of lead-tin plasma, etc., it will The efficiency of the tin stripping solution is reduced so that it is discarded

Method used

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  • Processing method for waste liquid from stripping tin scolding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The processing method of described desoldering waste liquid, comprises the steps:

[0027] 1. Add sodium chloride solution to the waste soldering solution so that the concentration of chloride ions in the solution is 2 mol / L, mix and stir at a temperature of 30 °C, and the reaction time is 1 hour, then filter the solution , the filter residue includes lead chloride precipitation and a small amount of silver chloride, the filter residue uses strong ammonia water, the concentration of commonly used strong ammonia water is 25~28% ammonia water, washing and dissolving silver chloride precipitation, washing liquid reclaims silver, obtains purer chlorine Lead;

[0028] 2. Extract the ferric iron from the filtered filtrate with N235 extractant, back-extract the organic phase loaded with ferric iron with water, and the back-extraction solution is ferric chloride solution, which can be returned to prepare tin stripping solution;

[0029] 3. Adjust the pH of the solution to 1.0~...

Embodiment 2

[0034] The processing method of described desoldering waste liquid, comprises the steps:

[0035] 1. In the waste soldering solution, add calcium chloride to react, so that the concentration of chloride ions in the solution is 4 mol / L, mix and stir at a temperature of 10 ℃, the reaction time is 4 hours, and then filter the solution , filter residue comprises lead chloride precipitation, and a small amount of silver chloride, and filter residue washes and dissolves silver chloride precipitation with 25% strong ammonia water, and washing solution reclaims silver, obtains relatively pure lead chloride;

[0036] 2. Extract the ferric iron from the filtered filtrate with N235 extractant, back-extract the organic phase loaded with ferric iron with water, and the back-extraction solution is ferric chloride solution, which can be returned to prepare tin stripping solution;

[0037] 3. Adjust the pH of the solution to 1.0~2.0 with alkali, then add sulfate, the ratio of the moles of sul...

Embodiment 3

[0042] The processing method of described desoldering waste liquid, comprises the steps:

[0043] 1. In the waste soldering solution, add potassium chloride to react, so that the concentration of chloride ions in the solution is 3 mol / L, mix and stir at a temperature of 20 ℃, and the reaction time is 2 hours, then filter the solution, The filter residue includes lead chloride precipitate and a small amount of silver chloride. The filter residue is washed with concentrated ammonia water to dissolve the silver chloride precipitate, and the silver is recovered from the washing solution to obtain relatively pure lead chloride;

[0044] 2. Extract the ferric iron from the filtered filtrate with N235 extractant, back-extract the organic phase loaded with ferric iron with water, and the back-extraction solution is ferric chloride solution, which can be returned to prepare tin stripping solution;

[0045]3. Adjust the pH of the solution to 1.0~2.0 with alkali, and then add sulfate to ...

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Abstract

The invention provides a processing method for waste liquid from stripping tin scolding, which comprises the following steps: in the waste liquid from stripping tin scolding, adding a chlorate for reacting, then filtering the solution, washing the filter residue by a concentrated ammonia liquor for dissolving the silver chloride sediment, recovering silver by a washing lotion to acquire pure lead chloride, extracting a filtrate by an extractant to obtain ferric iron, wherein a strip liquor is a ferric trichloride solution which can be prepared to a tin stripping liquid, adding sulfate for depositing lead and silver, wherein the reacted filter residue is a mixed sediment of lead sulphate and silver sulfate, washing by the concentrated ammonia liquor, reducing to obtain a silver powder and lead sulphate; filtering and depositing lead and silver, depositing tin and iron, filtering to obtain the sediment and dissolving by alkali, and then electrolyzing to obtain tin, electrolyzing the residual filtrate to recovery copper, and depositing palladium in the solution to obtain the sediment for recovering palladium. The processing method has reasonable and useful process flow, and performs comprehensive recovery and utilization on valuable metal in the waste liquid from stripping tin scolding, the resource waste is reduced, and the environmental pollution is reduced.

Description

technical field [0001] The application of the present invention relates to a treatment method for solder stripping waste liquid, which belongs to the technical field of resource recovery and utilization. Background technique [0002] With the increasing attention paid to the disposal of electronic waste, how to separate the components in the circuit board from the substrate has become a research hotspot. There are many methods for desoldering components, such as plasma method and microwave heating method. However, the chemical treatment method is still widely used due to its simple equipment and high treatment efficiency. However, due to the presence of lead, tin, iron, copper and other heavy metals in these waste soldering liquids, as well as their strong acidity and strong oxidizing properties, if they are not handled properly, they will have a great impact on the environment and are not conducive to the comprehensive utilization of resources. [0003] The solder strippin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C02F9/04C01G21/16
CPCY02P10/20
Inventor 王勤管于军陈艳红伍金平苏陶贵何显达
Owner JIANGXI GREEN ECO MFG RESOURCE CYCLE
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