Fluorite (CaF2) contains F48.9%, CaSl.1% fluorite has good floatability, and fatty acids are often used as collectors . The pH of the pulp has a great influence on the flotation effect of fluorite. Using oleic acid as a collector, when the pH of the slurry is 8 to 11, the fluorite has better buoyancy. Secondly, raising the temperature of the slurry can also increase the flotation index of fluorite. At the same time, the flotation behavior of fluorite with different particle sizes is also different.
The coarse-grained fluorite flotation is characterized by strong selectivity; therefore, its concentrate grade is high, but the recovery rate is low; the medium-grained fluorite flotation results in higher concentrate grade and recovery rate; fine-grained fluorite float The selected concentrate grade and recovery rate are both low. When flotation fluorite uses oleic acid as a collector, there is also a higher requirement for floating water. That is, when the water quality is hard water, the water entering the flotation process is first softened in advance.
Fluorite flotation collectors In addition to oleic acid, hydrocarbyl sulfates, alkylsulfonated succinamines, sodium oleoylsulfonate and other sulfonates and amines can be used as collectors for fluorite flotation. Commonly used sodium carbonate as a pulp conditioner. Depending on the nature of the gangue, can be used water glass, sodium meta-phosphates, lignosulfonates, and dextrin as gangue inhibitor.
Fluorite flotation method
The main problem with fluorite flotation is the separation from commensal gangues (such as quartz , calcite , barite, etc.). There is also the problem of separation from certain sulfides. Depending on the situation, the following methods can be used:
(1) Fluorite ore containing sulphide ore is generally firstly floated with a xanthate collector, and then a fatty acid agent is used to float fluorite. Sometimes in the fluorite flotation operation, a small amount of sulfide ore inhibitor (such as cyanide) is added to suppress residual sulfide to ensure the quality of the fluorite concentrate.
(2) Separation of fluorite and barite and calcite. Generally, oleic acid is used as a collector to float fluorite. When oleic acid fluorspar flotation, adding a small amount of activated aluminum salts fluorite, calcite and barite inhibition of dextrin was added.
For fluorite ore containing more calcite, limestone , dolomite, etc., it is better to suppress these gangue minerals with tannins and lignosulfonates.
(3) Separation of fluorite from quartz. The fatty acid is used as a collector to float fluorite, the water glass is used as an inhibitor of quartz, and the sodium carbonate is adjusted to have a pH of 8-9. The amount of water glass should be controlled well. When it is small, it can activate fluorite, but it does not inhibit quartz. When it is excessive, fluorite will be inhibited.
In order to add a minimum amount of water glass, but also to inhibit the intensity of the gangue quartz, often simultaneously with the addition of water glass, then add the polyvalent metal ions (e.g. Al3 +, Fe3 +) and alum, and aluminum sulfate. In addition, the addition of Cr3+ and Zn2+ ions is also effective, and these ions not only inhibit quartz but also calcite.
(4) Separation of fluorite and barite. Fluorite and barite are generally mixed and floated, and then separated. In the mixed flotation, oleic acid is used as a collector, and water glass is used as an inhibitor. The following methods can generally be used for the separation of mixed concentrates:
1) inhibition of barite dextrin with iron salts or tannin, fluorite floating oleic acid;
2) The barite is floated with a hydrocarbyl sulfate, and the fluorite concentrate is left in the flotation cell.
C fluorite flotation example
A single fluorite ore containing about 40% CaF2, Si0254%, and CaCO32%. The process of using a coarse and a swept tail, a fine concentrate after re-grinding, and a six-time selection, and a return of the medium ore, with sodium carbonate as a regulator, oleic acid as a collector, and water glass as an inhibitor. The concentrate has CaF2>98% and the recovery rate is >75%.
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