As an important non-metallic mineral resource, fluorite is widely used. With the deepening of the development degree, the development of the associated fluorite mine is becoming more and more important. Among them, several minerals of calcite-barite-fluorite fluorite ore are similar, and the embedded granularity is generally fine, which belongs to a relatively difficult fluorite mine, so the flotation method is commonly used. In this paper, we will discuss barite-calcite-fluorite-type fluorite mineral processing from the aspects of process flow, grinding particle size, collector and inhibitor, and mineral slurry pH.
The ore composition of barite-calcite-fluorite ore is more complicated. The current flotation process is mainly priority flotation and mixed flotation. Priority flotation method first inhibits barite and calcite to flotation fluorite. The mixed flotation rule is to mix the flotation barite and fluorite first, and then inhibit the barite flotation fluorite.
The proportion of barite is large, which is difficult to be activated after inhibition, and flotation is difficult in the preferred flotation method. This kind of ore often needs to consider the comprehensive recovery of multiple minerals, so the mixed flotation method is widely used. The number of selection can be appropriately increased according to the different ore properties to improve the fluorite concentrate grade. Furthermore, the sweep phase can be increased to reduce the loss of useful minerals and improve recovery.
Barite-calcite-fluorite-type fluorite ores are generally finely embedded in particle size. In the grinding stage, as the content of particle size below 0.074mm becomes higher and higher, the recovery rate of fluorite will also increase. However, when the grinding particle size is too fine, the recovery rate will decrease. At this time, the adsorption of fine-grained minerals is high, which reduces the selectivity of the agent. Therefore, it is necessary to comprehensively consider the relationship between concentrate grade, recovery rate and grinding cost according to the nature of the ore.
In the flotation process of barite-calcite-fluorite type fluorite ore, the more commonly used collectors are oleic acid and oleate, sodium alkyl sulfate, naphthenic acid, oxidized paraffin soap, etc.
In the selection of inhibitors, the more commonly used ones include water glass, sodium sulfate, etc. When suppressing the calcite in the fluorite-barite-calcite-type symbiotic ore, it exhibits good floatability to fatty acid collectors such as oleic acid. Especially in the case of high calcite content, the flotation separation of fluorite is more difficult, and the use of water glass as an inhibitor cannot effectively inhibit its activity. Other inorganic inhibitors should be added or modified water glass should be used.
The slurry pH value plays an important role in the flotation of barite-calcite-fluorite ore. The zero electric points for the fluorite, barite, and calcite were 6. 2,3. 2, and 5. 5, respectively. When the pH value is less than the zero electric point, that is, when the pH value is low, the mineral surface is positively charged and the oleic acid anion is adsorbed by electrostatic force. When the pH value is high, oleic acid adsorbs minerals by forming multiple layers of calcium oleate. And the accumulation phenomenon of multilayer calcium oleate and fluorite is more obvious than that of it and calcite, at this time, mineral particles can better adsorb agents, easier to flotation recovery.
Because fluorite and barite have similar buoyability, their buoyability range is around the neutral pH value, and this range increases with the amount of oleic acid used. Therefore, controlling the slurry pH value of each step is crucial to the flotation effect.
The above are some aspects of barite-calcite-fluorite type fluorite ore flotation. Here, Xinhai reminds you that in the actual production, there are differences between different fluorite ore, we need to pay attention to the nature of the ore itself, according to the beneficiation test to develop a specific process, to avoid causing economic losses and resource waste.
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