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Click to add WeChatGold, as a precious metal, is very common in people's lives. It is not only regarded as a hard currency in the international capital market, but can also be collected as jewelry. With the passage of time, natural gold deposits have been exhausted. Nowadays, if you want to obtain gold deposits, you usually extract gold from gold deposits that are associated with sulfide minerals such as copper and sulfur or are associated with other minerals.
During mineral processing, because gold has good floatability, flotation method can be used to extract gold, but Due to the characteristics of high gold density and high specific gravity, the flotation effect of gold ore is limited by several factors such as gold ore particle size, slurry pH, slurry concentration, sludge, and carbonaceous matter in the gold ore. The following editor will analyze and introduce the above five influencing factors to help you handle gold mine flotation and improve gold mine recovery rate.
During gold ore flotation, its grinding particle size (grinding fineness) determines the flotation separation efficiency. One of the main factors is that gold ore is usually recovered by carrier flotation, which requires crushing operations to make the carrier mineral particle size reach a state that can be separated by flotation. Due to the high density of gold ore, if the ore contains larger gold particles, gravity separation is required for separation, which not only increases the difficulty of beneficiation, but also increases the cost of beneficiation.
Improvement method: When entering flotation, it is necessary to grasp the grinding particle size of the gold ore. Usually the gold particle size for flotation is not greater than 0.22mm, so as to facilitate Carry out flotation separation.
Flotation process Among them, the pH value of the ore slurry has an important impact on the flotability of the mineral. Although the pH value of gold ore flotation has a relatively wide range, the pH value is not within the appropriate range. When the pH value is too high or too low, it will cause gold to float. Decrease in selection efficiency.
Improvement method:Through experimental analysis, as the dosage of pH adjuster increases, the pH value of the slurry increases, and the flotation recovery rate of the common gold carrier mineral pyrite increases. , when the pH is around 8, the recovery rate of pyrite begins to decrease, so the pH value of the slurry for gold ore flotation is generally in the range of 7-9.
The influence of slurry concentration on gold ore flotation The efficiency of recovering floating gold deposits is very important. At the same time, high slurry concentration will also cause the viscosity of gold ore slurry to increase, making it difficult for mineralized foam to float, and reducing the flotation rate of gold mines.
Improvement method: For fine-grained gold ore below 38μm or 97~150μm For coarse-grained gold ores, higher flotation concentration can achieve higher recovery rates while maintaining the flotation rate.
Some gold ores contain Clay minerals tend to produce a large amount of slime during the grinding process. The properties of these slimes are complex and the particle size is very fine, which easily adsorbs the flotation reagents in the slurry and hinders the reaction between the gold ore particles and the flotation reagents, resulting in a deterioration of the flotation effect of the gold ore.
Improvement method: It is necessary to consider whether there are recoverable valuable elements in the slime, and separate the slime and slurry through desliming treatment Different treatments.
Some gold mines Contains carbonaceous substances. These carbonaceous substances mainly exist in the form of solid carbon, organic carbon, long-chain hydrocarbons, etc., and have the ability to absorb gold minerals. They will also absorb flotation reagents and easily cover the surface of gold minerals. The effect affects the reaction between gold ore particles and chemicals, which in turn affects floating.
Improvement method: You can use pretreatment to reduce the impact of carbonaceous matter on gold particles, and then add The method of using carbon inhibitors allows carbonaceous materials to react with inhibitors first, reducing their consumption of gold collectors, thereby increasing the role of collectors and gold-bearing minerals, and improving gold recovery rates.
The above are the five major factors that affect the efficiency of gold ore flotation and their improvement methods. In actual mineral processing production, In addition to the above factors that will affect the recovery rate of gold, the shape of the gold, the pharmaceutical system and the properties of the ore will also affect its flotation effect.
Therefore, mineral processing test analysis needs to be carried out for gold mines. According to the analysis results, it is indeed suitable Gold ore flotation process, the type and amount of chemicals required for gold ore flotation, the equipment required for gold ore flotation and the particle size requirements of the grinding process, etc. Only in this way can the ideal gold mine recovery rate be effectively obtained.
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