CN115747506A - Gold extraction process suitable for low-grade ore - Google Patents
Gold extraction process suitable for low-grade ore Download PDFInfo
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- CN115747506A CN115747506A CN202211585432.4A CN202211585432A CN115747506A CN 115747506 A CN115747506 A CN 115747506A CN 202211585432 A CN202211585432 A CN 202211585432A CN 115747506 A CN115747506 A CN 115747506A
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Abstract
A gold extraction process suitable for low-grade ores comprises the working procedures of ore grinding, grading, concentrating and adsorbing; in the grinding procedure, gold extracting agent is added into the ore pulp in the mill, and after the grading and concentration procedures, the concentration of the gold extracting agent in the ore pulp is kept within 0.8-1.0/10000 in the adsorption procedure. The gold extraction process ensures that the adsorption rate of the adsorption column is obviously improved under the conditions of not influencing the leaching rate of gold and less investment of a gold extraction agent and calcium hydroxide, thereby not only reducing the investment amount of a medicament, but also improving the recovery rate of the adsorption column and obviously reducing the gold extraction cost. The gold extraction process has the beneficial effects that the cyanidation leaching time is greatly increased, and the leaching rate of gold is improved; the ball mill moves violently, the temperature of the ore pulp is higher, and the higher temperature is favorable for improving the dissolving speed of gold in cyanide solution; the ore pulp is violently stirred, so that the oxygen content is high, and the leaching rate of gold is improved; reduces the environmental pollution and recycles the gold extraction liquid.
Description
Technical Field
The invention relates to the technical field of mining, in particular to a gold extraction process suitable for low-grade ores.
Background
In the existing gold extraction process, mineral aggregates are sequentially subjected to the working procedures of grinding, grading, concentrating and adsorbing, and a gold extraction agent is not added into ore pulp until the adsorption working procedure is carried out. The extraction of gold is completed in the adsorption process, and in order to improve the leaching effect of gold, ore pulp needs to be heated. However, the extraction rate of gold is difficult to improve all the time, and especially for low-grade ores, the gold extraction cost is higher than the product value, and the extraction significance is lost.
In the existing gold extraction process, the adsorption process is carried out in an adsorption column. In production, under the condition that the concentration of a gold extracting agent is unchanged, when the ore grade is reduced from 2.33g/t to 2.06g/t, the recovery rate of the adsorption column is reduced from 43% to 32%, and the grade of tail liquid of a carbon slurry process is increased by 0.001g/m for carrying out the thin film gold extraction. This means that as the grade of the ore decreases, the loss of the adsorption column increases and the grade of the tail liquor increases. Obviously, this results in a significant increase in gold extraction costs.
In conclusion, when the grade of the ore is changed negatively, the existing gold extraction process causes the gold extraction cost to be too high, and cannot bring profit to the mine enterprises.
Disclosure of Invention
In order to overcome the defects in the background art, the invention discloses a gold extraction process suitable for low-grade ores, which aims to: the leaching rate of gold is improved, and the gold extraction cost is reduced.
In order to realize the purpose of the invention, the invention adopts the following technical scheme:
a gold extraction process suitable for low-grade ores comprises the working procedures of ore grinding, grading, concentrating and adsorbing; in the grinding procedure, gold extracting agent is added into the ore pulp in the mill, and after the grading and concentration procedures, the concentration of the gold extracting agent in the ore pulp is kept within 0.8-1.0/10000 in the adsorption procedure.
Further improving the technical scheme that in the adsorption process, the carbon amount of the adsorption columns is reduced, so that the carbon amount of each adsorption column is 300-400kg.
The technical scheme is further improved, and in the ore grinding process, calcium hydroxide is added into ore pulp.
The technical proposal is further improved, after the procedures of classification and concentration, the concentration of calcium hydroxide in the ore pulp is 0.8-1.0/10000 in the adsorption procedure.
The technical scheme is further improved, and in the adsorption process, the addition amount of the flocculating agent per shift is 500-550g.
The technical scheme is further improved, in the concentration process, after the ore pulp is concentrated by a concentrator, the separated water returns to a grinding machine in the ore grinding process, and gold-containing pregnant solution enters the adsorption process.
The technical scheme is further improved, and in the adsorption process, an adsorption column is used for circularly adsorbing the gold-containing noble liquid.
The technical scheme is further improved, and in the adsorption process, the tail slurry is returned to a mill in the ore grinding process.
Due to the adoption of the technical scheme, compared with the background technology, the invention has the following beneficial effects:
1. greatly increases the cyaniding leaching time and improves the leaching rate of gold.
2. The ball mill has violent motion, the temperature of ore pulp is higher, and the higher temperature is favorable for improving the dissolving speed of gold in cyanide solution. It has been estimated that about 55% of the gold in the slurry is dissolved during the grinding process.
3. The ore pulp is violently stirred, the oxygen content is high, and the leaching rate of gold is favorably improved.
4. The calcium hydroxide is added into the ore pulp, so that metal ions can be removed, and the consumption of the gold extracting agent is reduced.
5. Reduces the environmental pollution and recycles the gold extracting solution.
For low-grade ores, the gold extraction process ensures that the adsorption rate of the adsorption column is improved under the condition of not influencing the leaching rate of gold and less investment of gold extraction agent and calcium hydroxide, so that the investment of the agent is reduced, the recovery rate of the adsorption column is improved, and the gold extraction cost is obviously reduced.
Drawings
Fig. 1 shows a flow chart of the present invention.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.
Example 1:
the gold extraction process is suitable for low-grade ore, and in the embodiment, the grade of the ore is 2.06g/t, which belongs to the low-grade ore level.
As shown in figure 1, the gold extraction process comprises the procedures of ore grinding, classification, concentration and adsorption. Wherein, in the ore grinding process, a gold extracting agent is added into ore pulp in the grinding mill. After the ore pulp is subjected to a grading process and a concentration process, the concentration of a gold extracting agent in the ore pulp is ensured to be 1.0/10000 in an adsorption process.
Specifically, in the ore grinding process, the ore material is ground using a ball mill. Due to wet milling, the fine mineral material is mixed with water to form a slurry. The gold extraction agent is added into the ore pulp, so that the gold extraction agent can be mixed with the ore pulp in advance, and the gold extraction agent has the advantages that:
1. greatly increases the gold cyaniding leaching time and improves the gold leaching rate.
2. The ball mill has violent motion, the temperature of the ore pulp is higher, and the higher temperature is favorable for improving the dissolving speed of gold in cyanide solution. It has been estimated that about 60% of the gold in the slurry is dissolved during the grinding process.
3. The ore pulp is vigorously stirred, the oxygen content is high, and the leaching rate of gold is improved.
The grinding balls and the lining plate in the ball mill are all made of iron, so that iron ions are easily generated, the leaching rate of gold is reduced due to excessive iron ions, and the gold extracting agent is consumed. Therefore, calcium hydroxide is also added into the ore pulp, and the concentration of the calcium hydroxide in the ore pulp is 1.4/10000 after the calcium hydroxide is added. The ore pulp can be alkaline after the calcium hydroxide, and the hydroxide radical reacts with metal ions such as iron ions and the like, so that the metal ions can be removed, and the consumption of the gold extracting agent is reduced. After the reaction, the concentration of calcium hydroxide was reduced. Thus, after the classification and concentration processes, the concentration of calcium hydroxide in the ore pulp can be ensured to be 0.9/10000 in the adsorption process.
After ore grinding, the ore pulp is graded by a spiral grading machine, the ore pulp with large particles returns to the ball mill for continuous grinding, and the qualified ore pulp enters a thickener for concentration. The gold extracting agent contains cyanide, in order to reduce environmental pollution, in the concentration process, the ore pulp is concentrated by a concentrator, the water removed is returned to a grinding machine in the grinding process, and the gold-containing pregnant solution subjected to cyanide enters the adsorption process. And finally, pumping the tail slurry in the adsorption process back to the mill by a pump, and recycling. The design is to recycle the gold extracting agent and the calcium hydroxide and prevent the gold extracting agent and the calcium hydroxide from polluting the environment.
In the adsorption process, the concentrations of the gold extracting agent and the calcium hydroxide play a decisive role in the leaching rate of gold and also play a great role in the adsorption rate. In the existing gold extraction process, the concentration of a gold extraction agent is generally 1.2-1.5/10000, the concentration of calcium hydroxide is 1.4-1.7/10000, and the addition amount of a flocculating agent per shift is 600-800g. Practice proves that the concentration of the existing gold extracting agent and the concentration of calcium hydroxide for low-grade ores not only do not improve the leaching rate of gold, but also reduce the adsorption rate of an adsorption column, and particularly when the concentration of the gold extracting agent and the pH value are both higher, the adsorption rate of the adsorption column is obviously reduced.
Repeated experiments show that when the concentrations of the gold extracting agent and the calcium hydroxide are reduced to a reasonable range, the adsorption rate of the adsorption column can be improved under the conditions that the leaching rate of gold is not influenced and the gold extracting agent and the calcium hydroxide are less added. In this example, the concentration of the gold extraction agent was 1.0/10000, the concentration of calcium hydroxide was 0.9/1000, and the amount of flocculant added per shift was 550g.
In the adsorption process, the gold-containing pregnant solution is circularly adsorbed by using an adsorption column. The advanced recovery of the adsorption column has great significance for purifying the water quality of the process, recovering the gold amount in advance and increasing the recovery rate, the recovery rate of the adsorption column is high, and the grade of the tail liquid can be well controlled.
Specifically, the amount of the charcoal in each adsorption column is first reduced from 500kg to 300kg. After the carbon amount is reduced, the activity of a carbon layer in the adsorption column can be increased, and the recovery rate of the adsorption column can be improved. In this example, the height to diameter ratio of the adsorption column was 3.5:1, delivering the gold-containing cyanide pregnant solution into an adsorption column from the bottom of the column at the speed of 5-9 BV/h for cyclic adsorption. Under the action of upward flow, the carbon layer can dynamically adsorb cyanide gold-containing noble metal liquid, so that the carbon layer in the column is prevented from hardening, and the uniformity and stability of the liquid inlet are improved.
After the measures are taken, the recovery rate of the adsorption column is improved to 37 percent from the previous 32 percent, the recovery rate is improved to 5 percent, the tail liquid grade is reduced to 0.013g/m for carrying out heavy planting from the previous 0.016 percent, the grade of the gold-loaded carbon of the adsorption column is improved to 914g/t from 650g/t, the unit consumption of the gold extracting agent is reduced to 1.28kg/t from 1.35kg/t, and the unit consumption of the calcium hydroxide is reduced to 4.2kg/t from 4.56 kg/t. According to the data, the gold extraction process not only reduces the input amount of the medicament for low-grade ores, but also improves the recovery rate of the adsorption column, and obviously reduces the gold extraction cost.
Example 2:
the gold extraction process is suitable for low-grade ore, in the embodiment, the grade of the ore is 1.736g/t, and belongs to negative variable grade.
In this example, a gold extracting agent is added to the pulp in the mill during the grinding process. After the ore pulp is subjected to a grading process and a concentration process, in an adsorption process, the concentration of a gold extracting agent in the ore pulp is ensured to be 0.8/10000, and the concentration of calcium hydroxide is ensured to be 0.8/1000. In the adsorption step, the amount of flocculant added per shift was 500g.
Example 3:
the gold extraction process is suitable for low-grade ore, and in the embodiment, the grade of the ore is 1.941g/t, which belongs to negative variable grade.
In this example, a gold extracting agent is added to the pulp in the mill during the grinding process. After the ore pulp is subjected to a grading process and a concentration process, in an adsorption process, the concentration of the gold extracting agent in the ore pulp is ensured to be 0.88/10000, and the concentration of calcium hydroxide is ensured to be 0.94/1000. In the adsorption step, the amount of flocculant added per shift was 520g.
The details of which are not described in the prior art. Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A gold extraction process suitable for low-grade ores comprises the working procedures of ore grinding, classification, concentration and adsorption, and is characterized in that: in the grinding procedure, gold extracting agent is added into the ore pulp in the mill, and after the grading and concentration procedures, the concentration of the gold extracting agent in the ore pulp is kept within 0.8-1.0/10000 in the adsorption procedure.
2. The gold extraction process suitable for low-grade ores, according to claim 1, is characterized in that: in the adsorption step, the carbon amount of the adsorption column is reduced to 300-400kg per adsorption column.
3. The gold extraction process suitable for low-grade ores, according to claim 1, is characterized in that: in the ore grinding process, calcium hydroxide is also added into the ore pulp.
4. A gold extraction process suitable for low grade ore according to claim 3, characterized by: after the classification and concentration processes, the concentration of calcium hydroxide in the ore pulp is 0.8-1.0/10000 in the adsorption process.
5. The gold extraction process suitable for low-grade ores, according to claim 1, is characterized in that: in the adsorption process, the addition amount of the flocculant per shift is 500-550g.
6. The gold extraction process suitable for low-grade ores, according to claim 1, is characterized in that: in the concentration process, after the ore pulp is concentrated by a concentrator, the water removed is returned to a grinding machine in the ore grinding process, and gold-containing pregnant solution enters the adsorption process.
7. The gold extraction process suitable for low-grade ores, according to claim 6, is characterized in that: in the adsorption process, the gold-containing pregnant solution is subjected to cyclic adsorption by using an adsorption column.
8. The gold extraction process suitable for low-grade ores, according to claim 7, is characterized in that: in the adsorption step, the tail slurry is returned to the mill in the grinding step.
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| RU2094503C1 (en) * | 1996-04-11 | 1997-10-27 | Акционерное общество "Иргиредмет" | Method of extraction of gold from ores containing the natural sorbents |
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| CN102031390A (en) * | 2010-12-23 | 2011-04-27 | 紫金矿业集团股份有限公司 | Process for extracting gold from low-grade difficultly-treatable gold ore containing arsenic and carbon |
| CN102127653A (en) * | 2010-11-29 | 2011-07-20 | 长春黄金研究院 | Process for extracting gold by modified pressure oxidation-cyaniding |
| CN102690957A (en) * | 2012-06-15 | 2012-09-26 | 紫金矿业集团股份有限公司 | Method for extracting gold from copper-containing gold oxide ore |
| CN105603207A (en) * | 2016-03-18 | 2016-05-25 | 广州有色金属研究院 | Reinforced leaching method of gold in magnetite |
| CN107955882A (en) * | 2017-11-20 | 2018-04-24 | 长沙有色冶金设计研究院有限公司 | The high-alkali Ultrafine Grinding extraction of gold process of Refractory Au-ores |
| CN111154975A (en) * | 2020-02-14 | 2020-05-15 | 中国恩菲工程技术有限公司 | Method for treating arsenic-antimony-containing gold-carrying material |
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2022
- 2022-12-11 CN CN202211585432.4A patent/CN115747506A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB620436A (en) * | 1946-01-10 | 1949-03-24 | Richard William Krebs | Method of recovery of precious metals |
| RU2094503C1 (en) * | 1996-04-11 | 1997-10-27 | Акционерное общество "Иргиредмет" | Method of extraction of gold from ores containing the natural sorbents |
| CN101643856A (en) * | 2008-08-06 | 2010-02-10 | 中国恩菲工程技术有限公司 | Method for extracting gold through cyanidation leaching under rich in oxygen |
| CN102127653A (en) * | 2010-11-29 | 2011-07-20 | 长春黄金研究院 | Process for extracting gold by modified pressure oxidation-cyaniding |
| CN102031390A (en) * | 2010-12-23 | 2011-04-27 | 紫金矿业集团股份有限公司 | Process for extracting gold from low-grade difficultly-treatable gold ore containing arsenic and carbon |
| CN102690957A (en) * | 2012-06-15 | 2012-09-26 | 紫金矿业集团股份有限公司 | Method for extracting gold from copper-containing gold oxide ore |
| CN105603207A (en) * | 2016-03-18 | 2016-05-25 | 广州有色金属研究院 | Reinforced leaching method of gold in magnetite |
| CN107955882A (en) * | 2017-11-20 | 2018-04-24 | 长沙有色冶金设计研究院有限公司 | The high-alkali Ultrafine Grinding extraction of gold process of Refractory Au-ores |
| CN111154975A (en) * | 2020-02-14 | 2020-05-15 | 中国恩菲工程技术有限公司 | Method for treating arsenic-antimony-containing gold-carrying material |
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