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Pyrolysis harmless treatment method for sulfur-containing cyanidation leaching tailings

A technology of harmless treatment and cyanidation leaching, applied in chemical instruments and methods, improvement of process efficiency, removal of solid waste, etc. Unable to meet the detection standard of Class I solid waste, etc., to achieve the effect of efficient and harmless treatment and good degradation effect

Inactive Publication Date: 2022-07-08
BACKFILL ENG LAB SHANDONG GOLD MINING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a large amount of CaO needs to be added during the treatment process, which increases the total amount of cyanide tailings; and a large amount of unreacted CaO still remains in the tailings after treatment, resulting in the leaching toxicity pH value of the tailings exceeding the standard, and still unable to reach Class I solids Waste related testing standards

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 1) The cyanidation leaching sulfur-containing tailings are press-filtered into a filter cake with a moisture content of about 14%, and the sulfur content of the filter cake is determined to be 18.79%.

[0017] 2) Disperse the filter cake so that the maximum agglomeration particle size is less than 2cm, and set aside.

[0018] 3) Take 2kg of the disintegrated filter cake from the kiln head and add it into the rotary kiln, and pass the gas from the kiln head to the rotary kiln as air, and the flow rate is 0.6m 3 / h, the rotary kiln is heated, the air flow increases with the material at the same time, the pyrolysis treatment is carried out for 2 hours, the maximum pyrolysis temperature is controlled at 480 °C, the temperature of the material discharged at the end of the rotary kiln is controlled at 180 °C, and the CO concentration in the exhaust gas is controlled at 360 ~450mg / m 3 .

[0019] 4) After the pyrolysis treatment of the tailings, it was determined that the tot...

Embodiment 2

[0021] 1) Press filter the cyanidation leaching sulfur-containing tailings into a filter cake with a moisture content of about 14%, and the sulfur content of the filter cake is determined to be 24.12%.

[0022] 2) Disperse the filter cake so that the maximum agglomeration particle size is less than 2cm, and set aside.

[0023] 3) Take 2kg of the disintegrated filter cake from the kiln head and add it into the rotary kiln, and pass the gas from the kiln head to the rotary kiln as air with a flow rate of 0.7m 3 / h, the rotary kiln is heated, the air flow increases with the material at the same time, and the pyrolysis treatment is carried out for 2 hours. ~420mg / m 3 .

[0024] 4) After the pyrolysis treatment of the tailings, it was determined: the total cyanide content of the sample toxic leaching was 0.18mg / L, the pH value was 7.89, the SO 2 The highest concentration is 6mg / m 3 .

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Abstract

The invention relates to a pyrolysis harmless treatment method for thiocyanation-containing leaching tailings, which comprises the following steps: adding a thiocyanation-containing leaching tailings filter cake obtained by filter pressing into a rotary kiln, heating, oxidizing and decomposing the thiocyanation-containing leaching tailings by utilizing the characteristic that a cyanogen-containing compound is easy to decompose at a high temperature, and driving materials in the rotary kiln to turn over when the rotary kiln rotates, and the self-crushing effect is achieved, and the oxidation reaction speed of cyanide is increased. By controlling the highest pyrolysis temperature and adjusting the pyrolysis atmosphere in the kiln, the concentration of oxygen and CO is controlled within a proper range, oxidation of sulfides in the tailings can be avoided, the content of SO2 in pyrolysis flue gas reaches the emission standard, the content of toxic leaching total cyanide in the treated tailings reaches the related standard of class I general solid waste, and the method is suitable for industrial production. And clean and efficient harmless treatment of the thiocyanation tailings is realized.

Description

technical field [0001] The invention relates to the field of harmless treatment of cyanide-containing solid waste, in particular to a method for the treatment of gold cyanide leaching sulfur-containing tailings. Background technique [0002] Due to the advantages of low processing cost, high recovery rate, and strong adaptability to raw materials, the cyanide leaching process has irreplaceable advantages in the gold industry, and will dominate for a long time. Although the cyanide gold extraction process has many advantages, cyanide is highly toxic, and the tailings generated during the leaching process are also identified as hazardous solid waste. In the actual production process, in order to reduce the amount of leaching slag produced in the cyanation process, gold ore is usually pre-enriched by flotation and other processes. The flotation process of gold is flotation for gold-carrying minerals such as pyrite. Therefore, the final flotation cyanide tailings are bound to c...

Claims

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Application Information

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IPC IPC(8): B09B3/00B09B3/40B09B3/35
CPCB09B3/00Y02P10/20
Inventor 高腾跃李光胜朱幸福吉强秦广林蔡明明徐超陈艳波于淙权卢中博张军童
Owner BACKFILL ENG LAB SHANDONG GOLD MINING TECH CO LTD
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