A method for enriching and extracting gold by using molten salt electrolysis

A molten salt electrolysis and enrichment technology, applied in the improvement of process efficiency, instruments, optics, etc., can solve the problems of poor adaptability of raw materials, difficult processing, and high equipment requirements, and achieve rapid and efficient removal, separation and enrichment. The effect of high ratio and short process flow

Active Publication Date: 2021-11-30
NORTHEASTERN UNIV LIAONING
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Problems solved by technology

Its disadvantages are: ① release a large amount of SO 2 、As 2 o 3 and other toxic and harmful gases; ②The furnace gas dust collection and purification device is complicated, the operation cost is high, and the environment is seriously polluted; ③The process operation requirements are strict, which may easily cause "under-burning" or "over-burning", resulting in incomplete decomposition of sulfides or secondary packaging Gold, which affects the recovery rate of gold
The disadvantages are: high requirements on equipment, high temperature and high pressure, and potential safety hazards; high maintenance costs; strict process control conditions, and the elemental sulfur solution produced by the reaction wraps gold again, affecting gold recovery; not suitable for carbon-containing ores
The disadvantages are: small scale and long pretreatment time; poor adaptability to raw materials, not suitable for processing ores with high arsenic content and gold and carbon content
Disadvantages are: usually incomplete oxidation, large amount of oxidant, high cost, large amount of wastewater, and difficult treatment; poor adaptability to raw materials, not suitable for processing materials containing carbon, arsenic, and high sulfur; recovery of arsenic, sulfur and other base metals difficulty

Method used

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  • A method for enriching and extracting gold by using molten salt electrolysis

Examples

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Comparison scheme
Effect test

Embodiment 1

[0053]In this example, a refractory gold mine in Liaoning is selected. Most of the gold is wrapped in sulfide, and its composition is 55.6g / t of gold, 14.8% of iron, 22.3% of sulfur, 5.2% of copper, and 5.9% of arsenic. Based on the above raw materials The method for extracting gold by enrichment by molten salt electrolysis comprises the steps of:

[0054] 1. Gold ore and chloride are dropped into the molten salt electrolyzer with flue gas collection hood according to the mass ratio=1:50, and the chloride is a mixture of sodium chloride and calcium chloride with a mass ratio of 2:1, In a natural air atmosphere, first raise the temperature to 150°C for drying and dehydration for 5 hours, then pass in nitrogen and raise the temperature to 680°C, use graphite as the cathode and anode, insert the electrodes and pass in direct current, and conduct molten salt electrolysis at 680°C and electrolysis voltage 4.0V 8h;

[0055] 2. The flue gas produced in the molten salt electrolysis p...

Embodiment 2

[0059] In this example, a difficult-to-treat gold mine in Gansu is selected. The gold is in the state of fine particle dissemination, and its composition is 15.6g / t of gold, 21.5% of iron, 30.1% of sulfur, and 5.3% of copper. Based on the above-mentioned raw materials, it is enriched by molten salt electrolysis A method for extracting gold, comprising the steps of:

[0060] 1. Put the gold ore and potassium chloride into the molten salt electrolytic cell with the flue gas collection hood according to the mass ratio = 1:2, first raise the temperature to 300°C for 0.5h in the natural air atmosphere, and then pass the volume ratio The mixture of 1:1 argon and helium is heated to 1350°C, with graphite as the cathode and noble metal iridium oxide as the anode, the electrodes are inserted and direct current is applied, and molten salt electrolysis is carried out at 1350°C and electrolysis voltage 2.0V 0.5h;

[0061] 2. The flue gas produced in the molten salt electrolysis process i...

Embodiment 3

[0065] In this embodiment, a gold mine in Inner Mongolia is selected. The gold mine contains both oxides and sulfides. Its composition is 63.8g / t of gold, 20.5% of iron, 10.1% of copper, and 5.2% of carbon. Based on the above raw materials, molten salt is used A method for electrolytic enrichment and extraction of gold, comprising the steps of:

[0066] 1. Gold ore and chloride are dropped into the molten salt electrolyzer with the flue gas collection hood according to the mass ratio=1:20, and the chloride is a mixture of magnesium chloride and potassium chloride with a mass ratio of 1:1. In a natural air atmosphere, first raise the temperature to 200°C for drying and dehydration for 3.5 hours, and then pass in argon gas to raise the temperature to 1000°C. With graphite as the cathode and titanium oxide as the anode, insert the electrodes and pass in direct current. At 1000°C, the electrolysis voltage is 3.0V Carry out molten salt electrolysis for 5 hours;

[0067] 2. The flu...

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Abstract

The invention relates to the technical field of gold smelting, and specifically provides a method for enriching and extracting gold by using molten salt electrolysis. In the salt electrolytic cell, it is dried and dehydrated first, then the oxygen-free gas is introduced, the electrode is inserted, and the temperature is raised to the molten salt electrolysis temperature, and then direct current is applied to carry out the molten salt electrolysis. After the molten salt electrolysis is completed, the metal product is extracted for casting Ingot, the flue gas is quenched to obtain the product, and then the cast metal product is used as the anode, and the solution is electrolyzed in the sulfuric acid system. After electrolysis, the gold mud is obtained from the anode, the copper is obtained from the cathode, and the iron salt product is obtained from the electrolyte. The process can achieve the advantages of strong raw material adaptability, short process flow, cyanide-free gold extraction, high comprehensive resource utilization rate, less waste residue, and high gold recovery rate.

Description

technical field [0001] The invention belongs to the field of gold smelting, and in particular relates to a method for enriching and extracting gold by using molten salt electrolysis. Background technique [0002] Gold has unique physical and chemical properties, such as strong corrosion resistance, good processing performance, and can completely reflect infrared rays. Gold has long been used for currency circulation and precious decorations, and it is also widely used in aviation, medical, industry, materials and other fields. The particle size of gold in my country's gold deposits is unevenly distributed, and the distribution state of gold in different types of deposits is very different, and the chemical composition of different gold ores is also different. Not the same. Common gold extraction methods include gravity separation, flotation, amalgamation, cyanide, pretreatment-cyanide, thiourea, thiosulfate, and halogen leaching. The first four methods are mainly applicabl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C3/34C25C1/20
CPCC25C1/20C25C3/34Y02P10/20
Inventor 陈国宝高富聪高世雄杨洪英马云瑞
Owner NORTHEASTERN UNIV LIAONING
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