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Flotation separation is a common gold beneficiation method, which is mainly used for extracting associated gold in polymetallic ore, removing impurities of gold extracted by cyanidation and so on. When using flotation method to separate gold ores, in order to achieve ideal recovery and gold concentrate grade, we should determine specific mineral processing schemes by the beneficiation test for different gold ores.
If you want to learn more about gold flotation processing, you should read this questions and its answers.
Flotation separation is the main processing method for gold-bearing sulfide ores. These sulfide ore often contain gold, silver, lead, sulfur and other minerals. Gold minerals have similar flotation properties with sulfide minerals, especially with copper sulfide minerals. Therefore, the flotation process of gold ore is similar to that of copper sulfide minerals.
Collectors used in gold flotation include xanthate, black powder, ammonium black powder, etc. Foaming agents commonly used include terpineol, alcoholic oil, 730 series foaming agents, etc. Lime, sodium sulfide, dichromate are common inhibitors. Therefore, how to select the composition of the agent should check the specific properties of the ore.
Due to the complexity of the disseminated relationship of this type mineral, we need to control the appropriate grinding fineness. It is necessary to do mineral dressing test before confirming the grinding fineness and reagent system.
Arsenic not only has a great impact on the quality of gold concentrate ore, but also pollutes the environment. Arsenic in gold ore is generally found in the gangue mineral. It is more closely disseminated with gold minerals so it is more difficult to separate.
The common methods for reducing the content of arsenic in the concentrate is the soda method, the lime method, the oxidation method. Among them, the oxidation method is a relatively more effective and widely used method. The main principle of this method is oxidizing the surface of the arsenic mineral and inhibiting the arsenic mineral by adding the oxidizing agent to increase the content of free oxygen in the aqueous solution.
On the basis of inhibition of arsenic, the content of free oxygen in water can be increased and the floatability of arsenic minerals can be lowered by adjusting pH and temperature. So that the content of arsenic in gold concentrate is reduced.
Generally, arsenic minerals have good floatability under weakly acidicconditions, while under neutral and weakly alkaline conditions, the floatability of arsenic minerals is reduced, and gold minerals still have good floatability under such conditions. Normally, we adjust the PH value to 8 to separate the arsenic-containing gold ore by flotation.
For different arsenic-bearing gold mines, the specific oxidants, PH values, and temperature ranges are different. Hence, it is more scientific and rational to determine appropriate conditions by doing mineral processing test.
The organic carbon minerals in the gold ore not only have good floatability, but also have strong adsorption power, which not only affects the gold concentrate grade, but also wastes a lot of flotation reagents. Therefore, it is necessary to reduce the influence of organic carbon on gold ore flotation through decarburization.
Decarburization can be achieved by roasting, adding agents and other methods.
Roasting is mainly aimed at gold ores with high carbon content. For gold ore with relatively low carbon content, carbon can be firstly selected by sodium silicate, no. 2 oil and kerosene, and the floatability of carbon inhibited by CMC can also be added into pulp.
However, the method of adding inhibitors has a great impact on the recovery of gold ore, so the organic carbon in gold ore can be removed by processing carbon first.
Whatever minerals in your gold ore, if we want to process gold by flotation we need doing mineral processing test to determine appropriate conditions.
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