Flotation is often used as the main beneficiation method of the low-sulfur quartz gold mine. For this kind of gold-containing minerals, they usually have the characteristics of uneven granularity, complex symbiotic relationship between gold minerals and pyrite, which causes some difficulties to select other gold minerals. Gold minerals, as a common precious metal, are very concerned about the recovery rate. Therefore, how to select the quartz gold mine to improve the recovery of gold minerals has become a wide concern.
In the study of this problem, in view of the more complex embedding and symbiotic relationship of gold minerals in the ore, we can explain from three perspectives: adjusting the flotation agent system, improving the process of the grinding stage.
For the flotation process, the use of flotation agent directly affects the recovery of ore, so it is essential to adjust the flotation agent system to improve the recovery rate.
In the flotation of quartz type gold mine, often choose yellow medicine as a catcher for use, but also can use black medicine and other agents. In the actual production, advanced yellow medicine can achieve more considerable recovery effect than lower yellow medicine. In many concentrators, gold mining is difficult to solve by using a single trap, so the combined trap is more widely used. Commonly used combination capture combinations include butyl and butyl lammonium black, butyl and pentyl.
In addition to trap adjustment, activators and inhibitors are also able to improve gold recovery. Activators can improve the flotation speed and ore floatability, thus increasing the gold recovery rate. The activators used in the flotation of quartz-type gold mine include copper sulfate, lead nitrate and lead sulfate, etc., among which the role of copper sulfate is more obvious. In the selection of inhibitors is mainly for toxic sand, carbon, bauxite, etc., to eliminate the impact of such minerals on the flotation of the gold mine, so as to improve the recovery rate. Inhibitors commonly used in these gold mines include water glass, lime, etc.
Of course, in the practice of adjusting flotation agents, the use of agents is closely related to the nature of the ore, so tests should be carried out first and reasonably adjusted according to the test measurement results.
For uneven quartz gold deposits, improving the grinding stage is one of the effective ways to improve the gold recovery. In the production practice, we can get the conclusion that: generally within a certain range, the higher the grinding fineness, the higher the recovery rate.
However, due to the high production costs generated by the grinding stage, sometimes the production costs of direct grinding ore may be only achieved by a small increase in the gold mine recovery rate, which can not meet the economic expectations. Therefore, in the production, according to the ore situation, there are also necessary to improve the recovery rate, the priority to the coarse grain gold mine recovery, to achieve the purpose of avoiding metal loss.
In addition to the above two ways, improving the beneficiation process is also a way to improve the recovery rate of quartz gold mine. There are two directions in the improvement of the beneficiation process: one is to improve the flotation process itself, and the other is to add other beneficiation methods on the basis of the flotation process.
In the flotation process itself, using closed-circuit flotation achieves higher recovery than open-circuit flotation. On the basis of flotation, the combined process of reselection-flotation and cyanidation process can be formed to increase the recovery of gold mine in tailings.
We study the problem of how to improve the recovery rate of quartz gold deposits from the above three aspects. Although quartz gold mineral composition is similar, but the component composition and structure are not the same, for the concentrator process is not copied, to avoid economic losses, in addition, although the recovery rate is one of the important mineral processing indicators, but pay attention to the recovery rate should also pay attention to concentrate grade, to achieve the relative balance of the two indicators is the purpose.
