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A green smelting method for rapid arsenic removal from arsenic-containing tailings sand

A tailing sand and arsenic removal technology, which is applied in the field of industrial solid waste arsenic removal and microwave arsenic removal, to shorten the arsenic removal time and solve the bottleneck problem

Inactive Publication Date: 2016-06-08
郴州高科创新产业孵化器有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an environmentally friendly new method for treating arsenic in arsenic-containing tailings with no secondary pollution, low consumption and high efficiency, aiming at the shortcomings of the existing solid waste arsenic-containing poisonous pollution treatment technology

Method used

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  • A green smelting method for rapid arsenic removal from arsenic-containing tailings sand

Examples

Experimental program
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Effect test

example 1

[0023] Example 1. Take Guangxi Dachang tin mine tailing sand (containing 2.6% arsenic and 19% iron) 2000G, with a particle size of less than 150 mesh arsenic-containing tailing sand (because the sample contains iron and other absorbing agents, no external absorbing agent), Put it in a high-temperature resistant ceramic pot with asbestos fiber cloth attached to the outside of the pot, cover the ceramic pot with a high temperature air duct cover on the ceramic pot, and seal the gap between the ceramic pot and the lid with asbestos fiber tape, close the microwave oven door, and turn on the condensation After the water circuit switch and vacuum pump of the system, observe the vacuum degree of the vacuum gauge to 550mmHg, turn on the microwave power and adjust it to 800W, observe the reading of the thermocouple thermometer at the top of the ceramic cover, 9 minutes when the temperature reaches 299 degrees, the temperature rise rate changes rapidly The temperature rose again after 13 ...

example 2

[0024] Example 2. Take Chenzhou Nonferrous Metals Park tailings sand (containing 1.6% of arsenic, 17.3% of iron, and 2.2% of manganese) 3000G, with a particle size of less than 200 meshes. Because the sample contains iron and other wave absorbing agents without external wave absorbing agents, they are placed in a tank In the high temperature resistant ceramic tank with asbestos fiber cloth attached, cover the ceramic tank with high temperature air duct cover on the high temperature ceramic tank, and seal the ceramic tank and cover with asbestos fiber tape, close the microwave oven door, and turn on the water circuit switch of the condensation system After the argon pump system, observe the pressure gauge reading to 135KPa, turn on the microwave power and adjust it to 1000W, observe the thermocouple thermometer reading at the top of the ceramic cover, and see that the temperature rises to 317 degrees in 11 minutes, and the temperature rise speed decreases rapidly. After a few min...

example 3

[0025] Example 3. Take 50KG of Hunan Yaogang fairy tailing sand (with 2.3% arsenic), sieving the ore powder with a particle size of less than 200 mesh, and sift the tailing powder, and then fully grind it with 5KG of iron red powder with a particle size of less than 200 mesh, and place it outside the tank. In the high temperature ceramic tank with asbestos fiber cloth, place the high temperature ceramic cover with high temperature conduit on the ceramic tank, seal the ceramic tank and the cover with asbestos fiber cloth, close the microwave oven door, turn on the condensation system water circuit switch and the argon pump system switch, Adjust the pressure of the argon pump until continuous bubbles remain on the water surface in the lower end of the condensing system, turn on the microwave power and adjust it to 5000KW. After 15 minutes, observe that the thermometer reading reaches 326 degrees, the temperature rises significantly, and the temperature starts to rise again after 25...

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Abstract

The present invention relates to a method for collecting arsenic or arsenide through microwave heating arsenic-containing mine tailings, and the specific steps are as follows: placing the mine tailings into an airtight, high temperature-resisting non-metallic container which is placed in a microwave chamber; separately starting a recovery system, a condensation system and a microwave generator in sequence; when a temperature rises again after a stable value of the temperature of mine tailings appears at the temperature range of 360 + / - 130 DEG C, turning off the microwave generator; and when the temperature drops below 90 DEG C, turning off the condensation system and the recovery system to collect the arsenic or arsenide. The method of the invention is advantageous by realizing no secondary pollutions and rapid arsenic-removal operations; according to the method, significant improvement of prior arsenic-removal methods is obtained; compared with prior wet arsenic-removal methods such as tailing arsenic-removal by high-temperature fuel heating or strong acid and strong alkali heating and pressing, the arsenic-removal time in the method of the invention is significantly shortened by tens to hundreds of times, no secondary pollutions such as arsenic are generated, the removed arsenide becomes an useful product after being collected, after the arsenic removal, and residual mine tailings become available materials without arsenic contaminations, thus effectively turning solid arsenic-containing waste into treasure.

Description

Technical field [0001] The invention is a green smelting method for fast dearsenication of tailings sand, and is a new type of microwave dearsenication method for treating tailings sand with no secondary pollution, low consumption and high efficiency. It belongs to the field of solid waste detoxification technology, and is a new technology involving the removal of arsenic from industrial solid waste. Background technique [0002] Arsenic is commonly known as a metalloid, which is extremely toxic and has carcinogenic effects. It can enter the environment through natural effects and human activities. The global arsenic released into the environment due to human activities is about 1.2 million tons each year, and the arsenic released into the environment by natural effects is about 22,000 tons. The amount of arsenic collected in my country is at least 1.39 million tons, of which Guangxi, Yunnan and Hunan collect arsenic. The largest amount. In the mining and smelting process of ar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A62D3/178A62D101/43
Inventor 雷恒毅白涛李淑萍刘章
Owner 郴州高科创新产业孵化器有限公司