Fluorite beneficiation (fluorite beneficiation method) beneficiation method mainly uses the separation of fluorite hand selected, gravity separation and flotation 3. Flotation method is the most widely used. Hand selected for the treatment of large crystalline massive fluorite. According to +200mm, 200 -30mm, 30-15mm  15-0mm level of separation of the four, according to the grade and the impurity content of the content of the determination of its use in the. With gravity applies to the metallurgical ore production or as flotation preconcentration. Usually the ore tailings or hand broken to 25 ~ 30mm, by screening, grading selected. Fine sorting by jigging and tabling; coarse particles with heavy medium separation method, commonly used in ferrosilicon as medium. Contains barite and galena ore in heavy metal minerals, the fluorite as the first heavy recovery, otherwise, it will be enriched in heavy products. Flotation is mainly used in the production of high grade concentrate in chemical industry and ceramic industry.

The process of removing calcium from fluorite is composed of one roughing and multiple selection. Collector for roughing with oleic acid, with a mixture of sulfuric acid and acidic water glass as inhibitors of calcium sulfate minerals, and water glass acid ratio of 1:0.5 to 1:2, with dosage of 0.5-1.5kg / T, the process of removing calcium ore, the method has the advantages of high efficiency calcium removal, simple process and low cost. High grade fluorite concentrate with low calcium carbonate can be selected from high calcium fluorite ore.

Fluorite flotation

（一）Process for removing calcium from fluorite, which is made up of one roughing and several times. Collector for roughing with oleic acid, with a mixture of sulfuric acid and acidic water glass as inhibitors of calcium sulfate minerals, and water glass acid ratio of 1:0.5 to 1:2, with dosage of 0.5 ~ 1.5kg / T, the process of removing calcium ore, the method has the advantages of high efficiency calcium removal, simple process and low cost. High grade fluorite concentrate with low calcium carbonate can be selected from high calcium fluorite ore.

（二）Preparation method of fluorite flotation agent, oleic acid production of intermediate products of crude fatty acid or mixed fatty acid as the raw material to the sulfuric acid added to the weight of fatty acid, weight 3% ~ 15%, the sulfation reaction, to the reaction of fatty acid, the weight of 0.4% ~ 3% with dressing the foaming agent added to the weight of the product. The product has the advantages of strong collecting ability, good water solubility and dispersion, and is suitable for the flotation of fluorite at normal temperature and low temperature.

（三）A low grade fluorite, barite flotation separation method, using water glass as inhibitors of calcium carbonate and siliceous gangue minerals, fluorite, barite using oleic acid as collector, as inhibitors of barite with starch, sodium sulfate, hydrochloric acid, six sodium hexametaphosphate, can effectively lower grade the flotation separation of fluorite, barite. The ore grade is 33.92% ~ 40.14% fluorite, barite grade of 34.67% to 35.33% conditions, after mixed flotation separation, available for more than 95% grade, the recovery rate is 75.5 ~ 78.5% grade fluorite concentrate; 92.3% ~ 93.27%, the recovery rate is 75.20% ~ 77.73% of the barite concentrate.

（四）Fluorite flotation, fluorite flotation of fluorite, fluorite containing CaF2 F48.9%, good floatability, use fatty acid as collector, the flotation effect has great influence on the pulp pH of fluorite, when using oleic acid as collector, the pulp pH was 8 ~ 11, fluorite good floatability, elevated temperature, pulp can improve the flotation indexes of fluorite. The flotation behavior of fluorite with different particle size is also different. The flotation characteristics of coarse fluorite are highly selective. The medium size fluorite flotation concentrate grade and recovery rate are high, fine fluorite flotation concentrate grade and recovery rate are low, when fluorite flotation oleic acid as collector, has higher requirements on the flotation of water, with hard water to first after softening. Fluorite collectors in addition to oleic acid, alkyl sulfate, alkyl amine sulfonate and sulfonated succinate Bo and amine can be used as fluorite collector, commonly used sodium carbonate as the modifying agent, according to the different properties of gangue inhibitors can be used water glass, sodium hexametaphosphate, lignin sulfonate, dextrin as vein stone.

The main problem of fluorite flotation, fluorite and intergrowth gangue (quartz, calcite, barite etc.) separation. There are problems with the separation of certain sulfides, depending on the circumstances, the following methods can be adopted:

1, Containing sulfide ore fluorite ore, generally with xanthate collectors will sulfide ore surfaced, then add fatty acids collector flotation of fluorite, sometimes in the flotation in fluorite, adding a small amount of sulfide minerals (such as cyanide) inhibitors to inhibit sulfide mineral residues, to ensure the quality of the fluorite concentrate.

2, The separation of fluorite and barite, calcite, generally using oleic acid as collector to fluorite, using oleic acid as collector flotation of fluorite, adding a small amount of aluminum salt activation of fluorite, barite, calcite and dextrin inhibition.

To contain more calcite, limestone, dolomite and other complex fluorite ore contain these gangue minerals by tannin and lignin sulfonate is better.

3, The separation of fluorite and quartz, fluorite collection with collector of fatty acid, water glass as quartz inhibitor, sodium carbonate to adjust the pulp pH 8 ~ 9. To control the amount of water glass, a few of fluorite has activation, but the inhibitory effect of quartz is not enough, excessive fluorite will be suppressed, in order to add a minimum amount of water glass, and can achieve the inhibitory intensity of quartz gangue, often adding water glass and add polyvalent metal ions (such as Fe3 +, Al3 +) and alum, aluminum sulfate, etc.. In addition, the addition of Cr3 +, Zn2 + ions also have an effect, which not only quartz and the other side of the stone also have inhibitory effect.

4, The separation of fluorite and barite, fluorite is generally mixed with barite flotation, then mixed flotation separation, when using oleic acid as collector of water glass as the inhibitor, mixed concentrate separation may adopt the following methods:

(1) Using dextrin or tannin with ferric salt as the inhibitor, inhibition of barite, fluorite flotation with oleic acid;

(2) With alkyl sulfate flotation barite, flotation tank left for fluorite concentrate.

Two, fluorite beneficiation process

Flotation flowsheet of quartz fluorite ore and flotation flowsheet of carbonate fluorite ore. The fluorite in the polymetallic ore is recovered as a by-product. Fluorite flotation collector usually oleic acid, oxidized paraffin soap and other fatty acids or other soap, in the pulp pH8 ~ 10, for temperatures above 25 degrees under the conditions of pulp. The commonly used pH adjustment agent with sodium carbonate and sodium hydroxide. The gangue inhibitor water glass, tannin, tannin, lignin sulfonate and quebracho etc.. In order to ensure the quality of concentrate, the number of times of selection is at least three times.

The flowsheet of flotation of quartz fluorite ore is used for the separation of associated impurities in quartz - based fluorite ores. The crystal size of fluorite is very uneven, ranging from a few microns to tens of millimeters, and is closely related to quartz. Other impurities are calcite, pyrite, kaolinite, etc.. This kind of ore is easy to choose, usually with oleic acid and other fatty acid collector in alkaline medium after repeated selection can get qualified concentrate. Commonly used water glass as quartz inhibitor, but the amount should be strictly controlled, the amount of less activated fluorite, excessive dosage will inhibit fluorite. Often add Al3+ and Fe2+ polyvalent metal cations and alum, aluminum sulfate and calcite inhibition. The flow structure is characterized by multi stage grinding. Regrinding place and middling treatment options as ore particle size distribution characteristics and requirements of the concentrate quality. The flow structure of coarse concentrate regrinding middlings and return order; coarse concentrate regrinding and middling treatment alone; centralized return and middling regrinding middlings regrinding treatment alone. Typical flow chart 1, that is, China Dongfeng fluorite beneficiation process. The company has two kinds of ore mineral processing: fluorite ore block, CaF2 grade <40%, fluorite and quartz fine particle size distribution, difficult hardships; clastic ore particle size, 20mm, grade 55% to 65%, the content of quartz is less easy to wear, easy to choose. The process of ore crushing, grinding, coarse flotation, regrinding rough concentrate and the six selection, in order to return. Oleic acid was used as collector, sodium carbonate was used as modifier. Water glass as inhibitor. The main sorting index to concentrate the CaF2 more than 98%, SiO2 less than 0.8%, the recovery rate of CaF2 was 74%

Fluorite ore dressing method, fluorite ore dressing technology: