A kind of additive for strengthening tin oxidation and volatilization in waste solder and its application

An oxidative volatilization and additive technology, which is used in the field of strengthening the oxidative volatilization of tin in waste solder and the field of tin recovery, can solve the problems of low product added value, low metal recovery rate, and great harm to human body, and achieves easy mass production, The effect of good application effect and low cost

Active Publication Date: 2021-12-17
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing processes have problems such as long process, low metal recovery rate, and low added value of products
[0004] Lead in solder is a heavy metal element that is very harmful to the human body, and the existing recycling process inevitably produces various waste acids, waste liquids, waste gases, waste residues, etc.

Method used

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  • A kind of additive for strengthening tin oxidation and volatilization in waste solder and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] With the waste solder powder after mechanical crushing treatment as raw material (tin content 65.4%), raw material is mixed with the additive of 16% of waste solder quality (the component of weight portion of additive: 75 parts of inert aluminum oxide, 20 parts of silicon dioxide , 5 parts of stannous oxide) mixed evenly and then pressed into pellets, dried and then placed in a weakly oxidizing atmosphere at 925°C for 120 minutes of roasting; the weakly oxidizing atmosphere was composed of oxygen, carbon dioxide and nitrogen, of which The volume percentages are 1% and 10% respectively, and the balance gas is nitrogen; tin oxide is recovered, the tin recovery rate is 92.4%, and the purity of tin dioxide in the tin oxide is 96.7%. (obtain XRD phase analysis and microstructure analysis of tin oxide such as figure 1 Shown, grain size 56nm, theoretical purity 98.7%, product dispersion is good)

Embodiment 2

[0029] With the waste solder powder after mechanical crushing treatment as raw material (tin content 65.4%), raw material is mixed with the additive of 20% of waste solder quality (the component of weight portion of additive: 75 parts of inert aluminum oxide, 20 parts of silicon dioxide , 5 parts of stannous oxide) mixed evenly and then pressed into pellets, dried and then placed in a weakly oxidizing atmosphere at 925°C for 120 minutes of roasting; the weakly oxidizing atmosphere was composed of oxygen, carbon dioxide and nitrogen, of which The volume percentages are 1% and 10% respectively, and the balance gas is nitrogen; tin oxide is recovered, the tin recovery rate is 89.6%, and the purity of tin dioxide in the obtained tin oxide is 94.4%.

Embodiment 3

[0031] With the waste solder powder after mechanical crushing treatment as raw material (tin content 65.4%), raw material is mixed with the additive of 10% of waste solder mass (component by weight of additive: 60 parts of inert aluminum oxide, 36 parts of silicon dioxide , 4 parts of stannous oxide) after mixing evenly, carry out briquetting treatment, place the obtained agglomerates in a weak oxidizing atmosphere after drying and roasting at 875°C for 120min; the weak oxidizing atmosphere is composed of oxygen, carbon dioxide and nitrogen, of which oxygen and carbon dioxide The volume percentages are 1% and 8% respectively, and the balance gas is nitrogen; the tin oxide is recovered, the tin recovery rate is 87.9%, and the tin dioxide purity in the tin oxide is 95.2%.

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Abstract

The invention discloses an additive for strengthening the oxidation and volatilization of tin in waste solder and its application. The additive for strengthening the separation of tin and lead in waste solder includes main components such as inert alumina, silicon dioxide and tin oxide; After the additive is mixed with the waste solder to form a block, it is placed in a weak oxidizing atmosphere for oxidative roasting, and tin dioxide is recovered from the gas phase. During the process of volatilizing and recovering tin from the waste solder, the tin in the waste solder is significantly improved through the strengthening effect of the additive. , lead separation efficiency, waste utilization is realized, and higher economic value can be obtained. The method is simple in operation, low in production cost, and environmentally friendly.

Description

technical field [0001] The invention relates to a method for recovering tin from waste solder, in particular to a method for highly selective oxidation and volatilization of tin from waste solder to realize the separation of tin and lead, and also relates to an additive for strengthening the oxidation and volatilization of tin in waste solder , belonging to the field of non-ferrous metallurgy and secondary metals. Background technique [0002] With the advent of the information age, electronic products are closer to people's lives, and various portable and wearable devices are more popular. Solder is an indispensable and important raw material for electronic product manufacturing, and it is also one of the most important application fields of metal tin. However, on a global scale, the insufficient guarantee period of tin ore resources has begun to become prominent, and the price of international tin concentrates has increased year by year. On the other hand, after the elect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B1/02C22B25/02C22B25/06C01G19/02
CPCC22B7/001C22B1/02C22B25/02C22B25/06C01G19/02Y02P10/20
Inventor 苏子键张元波姜涛侯炜范晓慧李光辉郭宇峰彭志伟饶明军林坤成相霖刘康
Owner CENT SOUTH UNIV
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