Mercury ore (cinnabar) red, high density, brittle, and good natural floatability, can be preselected reselection, several methods or flotation combined sorting.
First, pre-selection
1. The hand selection of mercury ore is a traditional pre-selection method. The cinnabar is red or dark red, which is easy to identify with surrounding rock and gangue minerals. The hand selection is usually carried out on a hand-selected belt with a belt speed of 0.1 to 0.4 m/s. Hand selection of large ore, sometimes also set up a special hand selection station before the rough break, hand-selected grain size is generally 50 ~ 100mm size.
2. Breaking screening is another pre-selection method for mercury ore. Like all the brittle minerals, cinnabar is enriched in the fine-grained ore during the crushing process, and the appropriate mesh size is selected for grading, and the sieve level is discarded to achieve the pre-selection purpose.
Second, re-election
The mercury ore ratio is significant, which is beneficial to the re-election method. However, in the production practice, the separate re-election process is generally not used to treat the mercury ore, and the heavy-floating combined process is generally adopted.
The re-election equipment for mercury ore is most commonly used as a shaker and a jig. The jig is used to treat the grade of the sieve that is pre-screened before the ore is milled. The shaker can obtain a high-grade concentrate for the production of cinnabar.
Third, flotation
Flotation is the most common and effective beneficiation method in mercury ore beneficiation. Flotation can not only effectively recover the cinnabar in the ore, but also effectively recover various mercury minerals such as natural mercury, chlorosulfurite and other flotation. for treating mercury-containing multi-metal ore.
Mercury ore flotation plant equipment, domestic selection plants mostly use small and medium crushing equipment and mechanical agitating flotation machine. A few flotation columns are used as roughing equipment, and their technical and economic indicators are similar to those of mechanically agitated flotation machines. Some large foreign manufacturers choose self-grinding machines and large flotation machines.
Fourth, heavy-floating combined process beneficiation
The heavy-floating combined process beneficiation process is very common in mercury ore dressing plants. Most of China's cinnabar products are from the mercury ore dressing plant of this process.
The beneficiation process is that after the crushed ore is coarsely ground by a rod mill, the products are not classified, and the trapezoidal jig is used for sorting. This procedure is applicable to ores with thicker cinnabar inlays and relatively simple composition. The advantages are simple process, low water and electricity consumption, and the dehydration process can be omitted between re-floating operations, so the production cost is low and the capital investment is less. The total recovery rate is high.
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