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  Refractory gold ore refers to the part of gold ore that cannot be extracted effectively by the conventional cyanide leaching process after the fine grinding. The gold in this type of gold ore cannot contact with the cyanide solution due to physical encapsulation or chemical combination, resulting in a very low gold leaching rate. Therefore, how can we improve the gold leaching effect of the refractory  gold leaching process ? One. Pretreat the refractory gold The gold leaching rate of most refractory gold ores is about 10% ~ 20% when they are directly stirred by sodium cyanide. Generally, the gold leaching rate of refractory gold ore can be greatly improved by pretreating the raw materials, including oxidative roasting, hot-pressure oxidation, biological oxidation. 1. Roasting The roasting can resolve the sulfide, make the arsenic and antimony volatilize in an oxidized state, and make the carbonaceous materials lose the inactivity. The process has the advantages of strong ad...

  Jigging process  has the advantages of good separation effect, large processing capacity, wide separation granularity range, less investment, low production cost, simple process system, etc., so it is widely used in the  gravity separation  process. As an important equipment in the gravity separation process, the operation of jigger is directly related to the product quality and the economic benefits of the concentrator. In case of abnormal problems of jig, which may affect the normal work of the subsequent process flow, it should be dealt with in time. Therefore, it is very important to understand the common problems of the jigging process and how to deal with them. Here are some common problems of jig in the jigging process and their solutions. 1. The screen plate is loose or broken During the jigging process, if the screen plate bounces with the pulsating water, the screws of the screen plate are loosened or dropped. If a column of water appears at a certain par...

In general, the main mineral of natural silica sand and quartz sandstone is quartz, and some other impurity minerals are often associated with it, such as mica minerals, feldspar minerals and iron and aluminum oxide minerals. However, the mixing of these impurities greatly reduces the value of quartz sand and affects the quality of products. Therefore, it is necessary to carry out the impurity removal for the silica sand. Here are the silica sand purifying process and equipment for the  silica sand processing  plant. One. Process and equipment used for the impurity resolution of silica sand The impurity resolution process of silica sand means to adopt the crushing, grinding and classifying to break the natural quartz sandstone ore and make the impurities and minerals reach the state of monomer dissociation, and then use the classifying operation to obtain the raw silica sand meeting the requirements of grain size, so as to prepare for the subsequent impurity resolution of sili...