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The process quality management of the gold CIP plant is an important part in the production of gold mines. It includes 7 aspects: raw ore management, crushing process quality management, grinding quality management, leaching adsorption quality management, desorption and electrowinning quality management, smelting quality management and tailings treatment quality management.
The grade of gold in raw ore is not less than 3g/t; the oxidation degree of the ore remains stable, especially when the ore is purchased, the ore should be reasonably blended to keep the ore properties stable;
The moisture of the raw ore should be controlled within 5%, so as not to block the crushing cavity and the discharge port due to excessive moisture.
The maximum particle size of the ore fed into the crusher is not more than 85% of the size of the crusher's ore inlet, and the crushing cavity is stuck or blocked by rabbits.
Evenly feed ore into crusher; deal with the blockage of the crushing cavity in time; check the operation of the vibrating screen and the conveyor, and pay attention to the integrity of the screen;
After 7~10 days coarse crushing or 1~2 days fine crushing, check and adjust the size of the crusher's discharge port to make it reach the value required by the process.
The particle size of the final product in the crushing process is determined by the design and production test. It is less than 15mm for small and medium-sized CIP plant, less than 8mm for large CIP plant.
When the equipment is in operation, it must be operated in strict accordance with the technical operating regulations; equipment maintenance work should be done during non-operational hours;
Check the amount of ore supply every half an hour and try to maintain a balanced supply of ore as much as possible. And pay attention to the reasonable combination of lump ore and fine ore.
Determine the concentration and fineness of the pulp every half an hour, and the fluctuation range is not more than ±2% of the required value of the process.
The filling rate of the grinding medium should be between 40~45%, and the new grinding medium should be added in a certain amount and in a certain proportion on time, so that the diameter of the grinding medium has a reasonable ratio to maintain a high grinding efficiency.
Adhere to the roving inspection system for grinding and classifying posts to ensure the normal operation of various operational technical parameters and equipment for grinding and classifying.
(grinding ball mill and classifier system for gold CIP plant)
Before cyanide leaching, a multi-stage screen should be set up to remove wood chips and large ore particles; the concentration should be controlled within 40-45%, and the grinding fineness -200 mesh accounts for more than 90%.
The cyanide concentration is generally controlled to 0.03~0.08%, and the calcium oxide concentration is 0.01~0.03%, that is, the pH value is 10~11; always check whether the pressure of the air compressor is normal, and keep a proper amount of air in the leaching tank.
The density of activated carbon should be controlled at 10~20g/L; attention should be paid to prevent the screen from being blocked or damaged; when the slurry concentration becomes thinner or the raw ore processing volume becomes larger, the adsorption time must be re-examined and adjusted.
The particle size of the activated carbon is 6-16 mesh. Stir it in clean water for 1 to 2 hours before use, and then use a 16 mesh sieve to remove the broken carbon. Activated carbon needs to be acid treated after 5 to 10 cycles. After acid treatment, fire treatment is used to restore its activity.
The aeration volume should not be large, so as not to increase the slurry short circuit and cyanide degradation. The carbon density in the carbon slurry is controlled at 8~15g/L to ensure that the carbon has a high gold loading capacity.
Before desorption, first wash away the sludge adsorbed on the gold-loaded carbon with clean water, and then use hydrochloric acid with a concentration of 3 to 5% for pickling. After pickling, the gold-loaded carbon is then washed with clean water and alkaline water until it is neutral. Finally, send the gold-loaded carbon to the desorption column.
(desorption column for processing gold-loaded carbon)
The temperature of the pregnant should not exceed 90℃ during electrowinning. Check the gold concentration in the electrowinning tailing liquid to make the recovery rate of the electrowinning gold above 99%; regularly clean the gold-carrying steel wool, or scrape the gold on the cathode titanium plate, and carefully recover the gold mud.
Gold powder and gold ingots should be checked with a precision balance, and the gold powder should be mixed and sampling for chemical analysis. Gold ingots should be drilled in diagonal directions on both sides to send samples for testing.
The adsorbed tailings slurry contains about 0.03% cyanide, which can be discharged after being well treated((the cyanide content is less than 0.5mgL)) by acidification recovery method or the purification treatment method.
Sufficient dry slope section and slurry settlement area should be maintained in the dam to ensure the stability of the dam body and the natural precipitation and purification of tailings slurry. Check the content of harmful components in the tailings on time. Once there is a problem of exceeding the standard, measures must be taken to deal with it in time.
The above is an introduction to the process quality management of the carbon slurry plant. The self-operated mine owners of the gold CIP plant must strictly implement the management system to ensure that the gold product meets the standards and production.
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