Method for realizing harmless treatment of low-sulfur cyanidation tailings through suspended-state oxidizing roasting

A technology of oxidative roasting and disposal method, which is applied in chemical instruments and methods, transportation and packaging, and process efficiency improvement, etc., can solve the problems of high energy consumption, long processing time, high temperature, and achieve the effect of high heat transfer efficiency

Pending Publication Date: 2022-05-27
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The temperature in the cyanidation tailings treatment process is too high, the negative pressure operation is difficult, the treatment time is too long, and the energy consumption is too high

Method used

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  • Method for realizing harmless treatment of low-sulfur cyanidation tailings through suspended-state oxidizing roasting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] The Si content in the cyanide tailings of Example 1 is 29%, and the O content is 43%; the Si content in the cyanide tailings of Example 2 is 35%, and the O content is 52%; the cyanide tailings of Example 3 The Si content is 31%, and the O content is 47%; the Si content in the cyanide tailings of Example 4 is 35%, and the O content is 56%; the Si content in the cyanide tailings of Example 5 is 37%, and the O content is 56%. The content is 55%; the Si content in the cyanide tailings of Example 6 is 28%, and the O content is 46%; the Si content in the cyanide tailings of Example 7 is 26%, and the O content is 39%.

[0062] In the step (1), the mass percentage content of S in the cyanide tailings is preferably 6-10%.

[0063] In the step (1), the low thiocyanate tailings are treated by filter press, the moisture content is ≤15%, and the particle size is 0-200 μm.

[0064] In the step (1), the low thiocyanate tailings are preheated and sent to the gas-solid cyclone separato...

Embodiment 2

[0097] The low-sulfur cyanide tailings come from the cyanide tailings of a gold mining enterprise in Shandong. The total cyanide content is shown in Table 1, and the moisture content is 15.20%. Add CaO 3.2% to this low-thiocyanation tailings, put it into a suspended oxidation system, the oxidation temperature is 550°C, the oxidation atmosphere is 100% air, and the actual oxidation time is 80min. The total cyanide content in the samples of harmless disposal of cyanide tailings is ≤0.04mg / kg, and the removal rate is over 99.998%, which can meet the relevant requirements of cyanide residue utilization pollution control in "HJ 943-2018 Technical Specification for Cyanide Residue Pollution Control in Gold Industry" , especially the technical requirements for pollution control of gold ore cyanide tailings backfilling, suitable for underground filling, and the sulfur immobilization rate is 93.87%.

Embodiment 3

[0099] The low-sulfur cyanide tailings come from the cyanide tailings of a gold mining enterprise in Shandong. The total cyanide content is shown in Table 1, and the moisture content is 13.50%. Add CaO 9.0% to this low-thiocyanate tailings, and put it into a suspended oxidation system. The oxidation temperature is 550°C, the oxidation atmosphere is 90% air + 10% nitrogen, and the actual oxidation time is 80 minutes. The total cyanide content in the samples of harmless disposal of cyanide tailings is ≤0.04mg / kg, and the removal rate is over 99.998%, which can meet the relevant requirements of cyanide residue utilization pollution control in "HJ 943-2018 Technical Specification for Cyanide Residue Pollution Control in Gold Industry" , especially the technical requirements for pollution control of gold ore cyanide tailings backfilling, suitable for underground filling, and the sulfur immobilization rate is 92.22%.

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Abstract

The invention discloses a method for achieving harmless treatment of low-sulfur cyanidation tailings through suspended-state oxidizing roasting, and belongs to the technical field of harmless treatment of cyanidation tailings. The method comprises the steps that the low-sulfur cyanidation tailings with the sulfur element content being 0.1-10% are put into a suspended-state oxidizing roasting system; the method comprises the following steps: setting a mixed atmosphere of air and nitrogen for oxidation at 400-700 DEG C, in the process of suspended-state oxidizing roasting, cyanide degradation products in the low-sulfur cyanidation tailings are CO, CO2, NOx and the like, and a small part of sulfur elements are oxidized into SO2, adding a desulfurization device behind a suspended-state oxidizing roasting system, cooling and discharging the cyanidation tailings after roasting to obtain the treated cyanidation tailings, according to detection of 'HJ745-2015 Measurement Spectrophotometry of Soil Cyanide and Total Cyanide', the contents of the Total Cyanide and Easily-released Cyanide in the treated cyanidation tailings are both less than 0.04 mg / kg, and the cyanidation tailings meet the relevant requirements of cyanidation residue utilization pollution control in relevant technical specifications, especially the technical requirements of gold ore cyanidation tailings backfill pollution control.

Description

Technical field: [0001] The invention belongs to the technical field of harmless disposal of cyanide tailings, and particularly relates to a method for the harmless disposal of low-sulfur cyanide tailings by oxidative roasting in a suspended state. Background technique: [0002] At present, cyanidation is the most important method for processing gold ore at home and abroad, and 75% of the world's gold ore dressing plants use this method to extract gold. The cyanide reagents used in the cyanide leaching process mainly include sodium cyanide, potassium cyanide, ammonium cyanide, calcium cyanide, etc. Cyanide has the incomparable advantages of other leaching reagents such as strong gold-dissolving ability, high stability and low price. , and the gold leaching process, equipment, management and operation are relatively mature. However, cyanide is highly toxic, and the leached tailings not only have toxic components, but also have fine particle size and high heavy metal content,...

Claims

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Application Information

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IPC IPC(8): B09B3/70B09B3/40C22B11/08
CPCB09B3/00C22B11/08Y02P10/20
Inventor 赵冰韩跃新李艳军高鹏
Owner NORTHEASTERN UNIV
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