Oxidative roasting-microwave-assisted leaching gold extraction method of high-arsenic gold-containing sulfur concentrate

A microwave-assisted and oxidative roasting technology is applied in the direction of improving process efficiency to achieve the effects of short leaching cycle, high gold leaching rate and less environmental pollution

Active Publication Date: 2016-02-24
NANHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the application of microwave-assisted leaching technology to wet gold extraction has not been reported. Therefore, the use of microwave-assisted leaching technology to extract gold from high-arsenic gold-containing sulfur concentrates is still a new technology to be developed.

Method used

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  • Oxidative roasting-microwave-assisted leaching gold extraction method of high-arsenic gold-containing sulfur concentrate
  • Oxidative roasting-microwave-assisted leaching gold extraction method of high-arsenic gold-containing sulfur concentrate
  • Oxidative roasting-microwave-assisted leaching gold extraction method of high-arsenic gold-containing sulfur concentrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0030] Spread the high-arsenic gold-sulfur concentrate in the quartz boat, then put the quartz boat into the box-type resistance furnace with a power of 4kW, set the temperature of the box-type resistance furnace at 500-700°C, under this condition After roasting for 2 hours, take out the quartz boat containing the high-arsenic gold-sulfur concentrate. After the high-arsenic gold-sulfur concentrate is cooled, weigh it to calculate the ore weight loss rate. Then weigh 0.48g CuSO 4 , 4.74gNaS 2 o 3 , 1.32g (NH 4 ) 2 SO 4 , 0.378gNa 2 SO 3 , and measure 7.5mL of 15% NH 3 ·H 2 O, add 100mL of distilled water together to get 0.3mol / LNaS 2 o 3 , 0.03mol / LCuSO 4 , 1.0mol / LNH 3 ·H 2 O, 0.1mol / L (NH 4 ) 2 SO 4 , 0.3mol / LNa 2 SO 3 of thiosulfate solution. Then mix the roasted high-arsenic gold-containing sulfur concentrate and the prepared thiosulfate solution according to the solid-to-liquid ratio of 1:2-1:3, put them in a microwave device, set the microwave power to...

specific Embodiment approach

[0048] A high-arsenic gold-containing sulfur concentrate oxidative roasting-microwave assisted leaching gold extraction method, the specific steps are:

[0049] (1) Spread 30g of high-arsenic gold-containing sulfur concentrate in a quartz boat, then place the quartz boat in a box-type resistance furnace with a power of 4kW, and set the temperature of the box-type resistance furnace at 500-700°C, After roasting under these conditions for 2 hours, take out the quartz boat containing the high-arsenic gold-containing sulfur concentrate. After the ore is cooled, it is weighed and the weight loss rate of the ore is calculated.

[0050] (2) Weigh 0.48g CuSO 4 , 4.74gNaS 2 o 3 , 1.32g (NH 4 ) 2 SO 4 , 0.378gNa 2 SO 3 , and measure 7.5mL of 15% NH 3 ·H 2 O, add 100mL of distilled water together to get 0.3mol / LNaS 2 o 3 , 0.03mol / LCuSO 4 , 1.0mol / LNH 3 ·H 2 O, 0.1mol / L (NH 4 ) 2 SO 4 , 0.3mol / LNa 2 SO 3 of thiosulfate solution. Then 10g of the roasted high-arsenic g...

Embodiment 1

[0053] Example 1, spread 30g of high-arsenic gold-containing sulfur concentrate in a quartz boat, then place the quartz boat in a box-type resistance furnace with a power of 4kW, set the temperature of the box-type resistance furnace to 500°C, and After roasting under this condition for 2 hours, take out the quartz boat containing the high-arsenic gold-sulfur concentrate. After the ore is cooled, it is weighed, and the weight loss rate of the ore is 24.5%.

[0054] Add 10g of the prepared thiosulfate solution with a weight loss rate of 24.5% and 20mL into the Erlenmeyer flask (solid-to-liquid ratio: 1:2), fix the Erlenmeyer flask with a rubber stopper in a constant temperature incubator, and culture at a constant temperature The temperature of the box was set at 50°C, and the rotation speed was set at 250rpm. Under this condition, it was shaken and leached for 18 hours and then taken out. The high-arsenic gold-sulfur concentrate was filtered and dried at 105°C for 2 hours, and...

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Abstract

The invention relates to an oxidizing roasting-microwave-assisted leaching gold extraction method for high-arsenic gold-bearing sulfur concentrate. The specific implementation method is as follows: 1, oxidizing roasting, spreading high-arsenic gold-bearing sulfur concentrate in a quartz boat, placing the quartz boat in a resistance furnace, taking out the quartz boat after roasting for 2h, and weighing until ore is cooled; 2, microwave-assisted leaching, preparing specially-made thiosulfate solution which serves as leaching agent, and placing the roasted high-arsenic gold-bearing sulfur concentrate and the prepared thiosulfate solution in a microwave device for microwave-assisted leaching according to the solid-to-liquid ratio of 1:(2 to 3); 3, calculating slag-based leaching rate. Compared with the conventional method of directly leaching after roasting, the method provided by the invention has the advantage that after roasting, microwave is adopted to help thiosulfate to leach, so that the leaching period is short, the leaching rate is high, and the environmental pollution is low; the invention is applicable to leaching of other high-sulfur and high-arsenic gold ore which is difficult to treat.

Description

technical field [0001] The invention relates to the technical field of recovering gold from high-arsenic gold-containing sulfur concentrates, in particular to a technology for pretreating high-arsenic gold-containing sulfur concentrates by oxidizing and roasting, and then using microwave-assisted leaching to extract gold. Background technique [0002] A lead-zinc-gold mine in Hunan produces tens of thousands of tons of high-arsenic gold-sulfur concentrates every year. The composition of this sulfur concentrate is very complex, containing gold (6.70g / t), silver (47.90g / t), sulfur (43.08%), iron (39.10%), lead (0.58%), zinc (0.89%) , Arsenic (1.02%). How to efficiently utilize gold, sulfur, iron and other resources is a long-standing problem in the field of dressing and smelting. Relevant scientific and technological workers at home and abroad have done a lot of research, but no breakthrough has been made yet. [0003] The gold in this type of concentrate is mainly wrapped ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B11/00C22B3/14
CPCY02P10/20
Inventor 丁德馨胡南李峰李广悦赵维超李乐王永东陈伟彭志成
Owner NANHUA UNIV
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