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Oxidizing roasting-microwave-assisted leaching gold extraction method for high-arsenic gold-bearing sulfur concentrate

A microwave-assisted, oxidative roasting technology, applied in the direction of improving process efficiency, etc., to achieve the effects of fast heating speed, short leaching cycle, and low environmental pollution

Active Publication Date: 2015-01-28
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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  • Oxidizing roasting-microwave-assisted leaching gold extraction method for high-arsenic gold-bearing sulfur concentrate
  • Oxidizing roasting-microwave-assisted leaching gold extraction method for high-arsenic gold-bearing sulfur concentrate
  • Oxidizing roasting-microwave-assisted leaching gold extraction method for high-arsenic gold-bearing sulfur concentrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0030] Spread the high-arsenic gold-sulfur concentrate in a quartz boat, then put the quartz boat into a box-type resistance furnace with a power of 4 kW, and set the temperature of the box-type resistance furnace at 500-700°C. After 2 hours of lower roasting, the quartz boat containing the high-arsenic gold-sulfide concentrate was taken out. After the high-arsenic gold-sulfur concentrate is cooled, weigh it to calculate the ore weight loss rate. Then weigh 0.48 g CuSO 4 , 4.74 g NaS 2 o 3 , 1.32 g (NH 4 ) 2 SO 4 , 0.378 g Na 2 SO 3 , and measure 7.5 mL of 15 % NH 3 h 2 O, add 100 mL of distilled water together to get 0.3 mol / L NaS 2 o 3 , 0.03 mol / L CuSO 4 , 1.0 mol / L NH 3 h 2 O, 0.1 mol / L (NH 4 ) 2 SO 4 , 0.3 mol / L Na 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, and set the microwa...

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 30 g 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 4 kW, and set the temperature of the box-type resistance furnace at 500-700 After roasting for 2 h under these conditions, the quartz boat containing the high-arsenic gold-containing sulfur concentrate was taken out. After the ore is cooled, it is weighed and the weight loss rate of the ore is calculated.

[0050] (2) Weigh 0.48 g CuSO 4 , 4.74 g NaS 2 o 3 , 1.32 g (NH 4 ) 2 SO 4 , 0.378 g Na 2 SO 3 , and measure 7.5 mL of 15 % NH 3 h 2 O, add 100 mL of distilled water together to get 0.3 mol / L NaS 2 o 3 , 0.03 mol / L CuSO 4 , 1.0 mol / L NH 3 h 2 O, 0.1 mol / L (NH 4 ) 2 SO 4 , 0.3 mol / L Na 2 SO 3 of thiosulfate solution. Then 10 g of the roast...

Embodiment 1

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

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

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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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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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