Additive for strengthening tin oxidation volatilization in waste soldering tin and application thereof

A technology of oxidative volatilization and additives, which is applied in the field of tin oxidation and volatilization additives for strengthening waste solder and recycling tin, which can solve the problems of low added value of products, great harm to human body, low metal recovery rate, etc., and achieve easy mass production, Low cost, good application effect

Active Publication Date: 2021-03-30
CENT SOUTH UNIV
View PDF14 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Additive for strengthening tin oxidation volatilization in waste soldering tin and application thereof

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%.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
Login to view more

Abstract

The invention discloses an additive for strengthening tin oxidation volatilization in waste soldering tin and application thereof. The additive for strengthening tin-lead separation in the waste soldering tin comprises main components such as inert aluminum oxide, silicon dioxide and stannous oxide. The additive and the waste soldering tin are uniformly mixed and agglomerated, then the mixture isplaced in a weak oxidizing atmosphere for oxidizing roasting, tin dioxide is recovered from a gas phase, and the separation efficiency of tin and lead in the waste soldering tin is remarkably improvedthrough the strengthening effect of the additive in the process of volatilizing the waste soldering tin to recover tin, so that waste utilization is achieved, and a high economic value can be obtained; and the method is simple to operate, low in production cost and environment-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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap