The main problems that should be paid attention to when using activated carbon in the carbon slurry process

In the operation of carbon slurry process, the correct use of activated carbon has a great relationship with the achievement of better technical and economic indicators. The main problems that should be noted in technical operation are:

1. Particle size and strength of activated carbon    The size of the activated carbon particle size affects the adsorption rate, but has no effect on the equilibrium gold capacity. The carbon particles are fine, the specific surface area is large, and the adsorption speed is fast. However, when the carbon particles are too fine, the carbon particles float up quickly, the adsorption time is short, and it is difficult to control during operation, and the gold-loaded carbon is easily lost in the tailings. In the carbon slurry process, 6 to 16 mesh activated carbon is generally preferred; the activated carbon should have sufficient strength, otherwise it will be easily worn during the adsorption process to produce fine particle size, while the fine-grained carbon tends to be lost with the tailings, and the gold adsorbed thereon will also follow. Loss. At present, the best performance of activated carbon used in the field is coconut shell charcoal, followed by CH produced by Beijing Guanghua Lumber Factory. -16A And CH-18 apricot nuclear charcoal.

2. Activated carbon must be pretreated before use    When activated carbon is manufactured, shipped and regenerated, it often produces crushed charcoal, powdered charcoal or activated carbon granules. Therefore, it should be pretreated before use to remove fine carbon and sharpen the corners of the carbon granules to avoid the production process. The loss of gold is caused.

3. The amount of carbon added    The amount of activated carbon added is not only related to the determined amount of adsorption and the grade of the ore, but also the material consumption and labor costs. The grade of silver in the ore is too high, and it tends to increase the amount of carbon consumed and increase the scale of carbon treatment. It is not economical. From the production materials of some carbon pulp mills, the gold and silver grades in the ore exceed 46 grams / ton, should use other methods to deal with. The preferred amount of carbon added is shown in the table below.

Appropriate addition and release interval table for charcoal

Note: The data in the table is calculated as 94% of the gold recovery rate .

4. Carbon density    The density of carbon in different adsorption processes is different. The density of carbon in each tank should be changed to a certain gradient, and the latter stage should be slightly higher. This can increase the amount of gold in the tank and ensure the necessary adsorption rate. The density of the bottom carbon is too high. Although the adsorption rate is high, the number of adsorption stages and the adsorption time are too small, so the adsorption system is not reasonable enough.

5. Number of adsorption sections and adsorption time    The cyanide leached pulp is adsorbed by carbon in a dynamic system to increase the slurry flow rate, and the residence time of the slurry in the adsorption tank is shortened, and the adsorption time of carbon in the slurry is also shortened. The flow rate of the slurry, the number of adsorption stages and the adsorption time are determined by the amount of slurry and the dissolved gold. In practice, it is selected according to small experiments and practical experience.

6. Charging rate    In the determined carbon slurry system, reducing the carbon removal rate can increase the carbon loading. To determine the carbon removal rate, it is necessary to ensure that the gold content of the carbon slurry system per unit time and the gold content of the carbon are generally balanced, otherwise the gold will be accumulated in the tank. The rate of carbon extraction should be determined by the nature of the ore.

7. Adsorption amount    In the production, determine the appropriate amount of gold and silver adsorption, should consider the price of gold, the gold and silver grade in the ore, the price of charcoal, the impurity components in the pulp and its content, the size of the enterprise. A higher amount of adsorption will result in desorption, transportation is too frequent, carbon loss is increased, and cost is increased. In general, the adsorption of gold on activated carbon is usually taken as 4 ~ 8 kg / ton is more suitable. When gold or silver is contained in the slurry, the appropriate amount of adsorption depends on the ratio of gold to silver and the appropriate adsorption temperature.

8. Stirring strength    The adsorption operation should take a lower agitation intensity than the leaching operation. This is because the slurry and carbon must be kept in suspension, and at the same time, the carbon and the ore and equipment should be mechanically worn as little as possible. Stirring can make the slurry in suspension and ensure that the carbon and the ore are not precipitated at the bottom of the tank. Good adsorption of dissolved gold. However, excessive agitation not only increases the wear of the char, but also increases the agitation power and maintenance costs.

Soccer goal

Soccer goal,football goal,soccer goal with target sheet

Jiangsu Baoxiang Sports Equipment Co., Ltd , https://www.skyboundup.com