Method for separating tin from waste tinplate and preparing tin dioxide

A tin dioxide and tinplate technology, applied in the direction of improving process efficiency, can solve the problems of difficult operation, environmental pollution and high equipment cost, and achieve the effects of low pollution, low cost and simple preparation process

Active Publication Date: 2011-06-22
GUANGDONG BRUNP RECYCLING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the current methods for recovering tin from tinplate, which have problems such as difficult operation, high equipment cost, and environmental pollution, the present invention provides a low-cost, low-pollution method for recovering tin from waste tinplate

Method used

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  • Method for separating tin from waste tinplate and preparing tin dioxide
  • Method for separating tin from waste tinplate and preparing tin dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] After crushing waste tinplate with a vertical high-speed rotary pulverizer, weigh 500 g of the 60-mesh sieve, wash with 2 liters of 5% hot soda aqueous solution for 30 minutes, the temperature of the hot soda aqueous solution is 60 ° C, and analyze the main components of the filter residue after washing The result is as follows:

[0031] element

sn

Fe

Cu

Pb

Sb

paint

wt%

2.25

97.64

0.06

≤0.01

≤0.01

0.02

[0032] More than 93% of the paint can be removed through the hot soda aqueous solution, and 2% of tin is lost, and the paint in the filtrate can be recycled.

[0033] Take 400g of filter residue, add it to 200ml of 20% concentration sodium hydroxide solution, heat to 70°C, keep a certain stirring intensity, then add 3% sodium nitrate of filter residue weight as oxidant, react for 4 hours, filter to obtain sodium stannate filtrate, analyze the filtrate The main ingredients are as...

Embodiment 2

[0039] After crushing waste tinplate with a vertical high-speed rotary pulverizer, weigh 500 g of 100-mesh sieve, wash with 2 liters of 8% hot soda aqueous solution for 30 minutes, and the temperature of the hot soda aqueous solution is 50 ° C. After filtering and washing, take the filter residue 400g, add in 180ml25% concentration sodium hydroxide solution, heat to 60 ℃, keep certain stirring strength, then add 3% potassium chlorate of filter residue weight as oxidant, react for 4 hours, filter to obtain sodium stannate filtrate, analyze the main components of the filtrate as follows :

[0040] element

sn

Fe

Cu

Pb

Sb

paint

g / L

49.45

≤0.01

≤0.01

≤0.01

≤0.01

≤0.01

[0041] After leaching with sodium hydroxide + potassium chlorate, the leaching rate of tin is 98.9%.

[0042] Pass carbon dioxide gas into the above-mentioned filtrate, the consumption of carbon dioxide gas is 40 times of th...

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PUM

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Abstract

The invention discloses a method for separating tin from waste tinplate and preparing tin dioxide. The method comprises the following steps: (1) grinding waste tinplate, screening; (2) washing the screen underflow with soda water; (3) filtering the washed material, leaching filter residue with sodium hydroxide solution and oxidant, filtering the leachate, wherein the filtrate is sodium stannate solution; and (4) introducing carbon dioxide in the sodium stannate solution, filtering, and washing to obtain the tin dioxide product. The preparation method of the invention has low cost and pollution and remarkable economic value and market competition.

Description

technical field [0001] The invention belongs to the field of waste tin resource recovery, and more specifically relates to a method for separating and preparing tin dioxide from waste tinplate. Background technique [0002] Tinplate is a low carbon steel plate or steel strip coated with a thin layer of tin on both sides of the steel plate or steel strip. Tinplate can protect the food inside well in terms of physical and chemical properties, and can minimize the possibility of food corruption. It is widely used in food and beverage packaging. The amount of tin used on tinplate accounts for about 30% of the total amount of tin every year. 30%. Because tin has good ductility, and pure tin is non-toxic, it is widely used in the manufacture of tinplate and as food packaging materials; alloys of tin and other metals have good corrosion resistance and mechanical properties, and tin alloys are mainly used in machinery manufacturing and military industry. Tin dioxide is widely use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B3/12C22B25/00
CPCY02P10/20
Inventor 刘更好李长东唐红辉谭静进林兴章
Owner GUANGDONG BRUNP RECYCLING TECH
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