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The difference between the magnetic carbon method and the carbon slurry method is that the activated carbon belt is not magnetic. Therefore, the magnetic carbon method can be called a carbon slurry method in which gold is adsorbed by magnetic activated carbon, that is, a magnetic carbon carbon slurry method. The difference between it and the ordinary carbon slurry method is that the separation of the slurry and the carbon is performed by a magnetic separator instead of a fine sieve. Its main advantage is: it is more wear-resistant than ordinary activated carbon, thus reducing the loss caused by activated carbon pulverization. Due to wear resistance, fine-grained carbon can be used to accelerate the adsorption of gold, which is advantageous for the treatment of coarser-sized pulp. Due to the separation by magnetic separator, the loss of activated carbon and the loss of gold due to mechanical screening can be reduced.
The separation of the gold-loaded activated carbon and the slurry by the magnetron method is not separated by the size of the particles, but by the pulp with magnetic and non-magnetic properties. If it is sieved according to the particle size, there is a problem that the small particle-loaded gold charcoal is lost with the tailings, and the magnetic carbon method has no such problem.
With the magnetic carbon method, the magnetic substances in the ore must be removed in advance to prevent the magnetic substances from being mixed in the gold-loaded charcoal to cause depletion.
There are basically two methods for preparing magnetic activated carbon. One is to bond activated carbon particles with magnetic particles; the other is to make carbon particles together with magnetic particles to make activated carbon. When the magnetic carbon is prepared by the first method, sodium silicate is often used as a binder because sodium silicate is insoluble in cyanide pulp and has high heat and alkali resistance.
The best magnetic husk charcoal is charcoal or stone and coke and some form of finely divided magnetic iron ore, it is made of sodium silicate as binder. The magnetite is dried after it has been bonded to the carbon particles, and activation treatment is also required.
With magnetic carbon adsorption, gold particles with smaller particle size can be used to adsorb gold, thereby increasing the adsorption rate; fine gold-loaded carbon particles are also not easily lost with the slurry, thereby improving the adsorption recovery rate of gold; the coarser ore particles in the slurry are also easy to Separated from the carbon particles, the ore does not have to be ground very fine; the magnetic carbon has high strength and is not easy to wear.
In the test, it can be seen that there are some problems in the magnetron method: the adsorption capacity of carbon is small, which is caused by magnetic components; the investment of magnetic separator is higher than that of the middle sieve; the magnetite in the ore is natural. The magnetic material should be removed in advance, otherwise it will be mixed into the gold-loaded magnetic carbon, which will affect the next process.
Since the method requires a magnetic separator, the investment is large, and the optimal industrial production conditions have yet to be studied, so it is still in the experimental stage.
One of the main problems in the carbon slurry method (carbon leaching method) is that the fine gold- loaded activated carbon is easily lost with the tailings. In order to solve this problem, magnetic activated carbon has recently been used in place of general activated carbon. This is the magnetic carbon method.
April 25, 2023