Zhengzhou Hengyang Industrial Co., Ltd |
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Due to the different nature of fluorite mines in different regions, some processing plants use a three-stage one-closed crushing process, and some processing plants use a three-stage open-circuit crushing process. The fluorite ore beneficiation equipment in the crushing and screening stage is shown in the table below.
Equipment | Stage | Processing size (mm) |
Jaw crusher | Coarse crushing | <1250 |
Standard cone crusher | Medium crushing | <350 |
Short head cone crusher | Fine crushing | <130 |
Vibrating screen | Screening | <30 |
The two-stage grinding process is usually used in the grinding
stage of fluorite mines. When fluorite and other minerals are
closely coexisting in fine particles, the first stage grinding
usually cannot well separate the monomers of fluorite and
associated minerals, so After a period of grinding, coarse grinding
of concentrates and re-grinding is a commonly used method in the
separation of refractory fluorite ore, which is beneficial to the
subsequent stage of separation and improves the selection index.
Scope of application: suitable for high-grade fluorite nuggets and
particle mines with a particle size of 6-20mm.
Technological characteristics: The gravity beneficiation efficiency
is remarkable, the equipment structure is simple, and the operation
is convenient. The main fluorite mine beneficiation equipment is a
jig, among which the diaphragm jig is commonly used. Diaphragm jigs
produced by Hengyang are divided into two types, left-handed
machines and right-handed jigs. The upper limit is 6-8mm. It is not
only widely used in fluorite ore beneficiation process, but also
widely used in the separation of gold, tin, tungsten and other
minerals.
Scope of application: Applicable when the original ore has a high
mud content, associated with minerals with impurities, or when the
inlay of useful minerals is finer.
1. Separation of fluorite and sulfide ore
Usually, yellow medicine is used as a collector to float sulfide
ore preferentially, and then flotation of fluorite ore is carried
out. The fluorite ore flotation process generally uses fatty acid
collectors. In order to achieve a better flotation effect, a small
amount of sulfide ore inhibitor can also be added to suppress the
residual sulfide ore, so that the grade of fluorite concentrate can
be improved.
2. Separation of fluorite and barite
The ore type of a fluorite ore dressing plant is fluorite-barite
type, the main minerals are fluorite and barite, and the gangue
minerals are quartz and calcite. The specific fluorite ore
beneficiation process is as follows: one roughing, one sweeping,
and three flotation processes. See the table below for the analysis
results of the chemical composition of the original ore.
Composition | CaF2 | CaCO3 | BaSO4 | SiO2 | S | Others |
Content (%) | 35.04 | 4.44 | 30.89 | 11.31 | 5.62 | 12.7 |
Studies have shown that the amount of oleic acid required for
flotation fluorite, barite, and calcite is different. Floatation
fluorite uses the least oleic acid and calcite the most. When the
flotation slurry is neutral, the floatability of fluorite and
barite is similar. When the slurry pH is greater than 10, only the
flotation effect of calcite is better. When the slurry is acidic,
the floatability of fluorite is heavier. The spar is good, which
can realize the separation of fluorite and barite.
The fluorite beneficiation uses oleic acid as collector, water
glass as inhibitor, and flotation under the condition of ore pulp
pH of 8.5-9. The pH adjusters are sodium carbonate and sulfuric
acid. Sodium carbonate can not only adjust the pH, but also be a
softener of hard water, and can also be used to disperse sludge. In
the flotation, in order to prevent foaming and stickiness, the
amount of sodium carbonate and oleic acid should be added in an
appropriate amount. In order to ensure high-quality fluorite
concentrate, fluorite and barite concentrate are obtained by the
method of inhibiting the barite from floating out of fluorite.
3. Separation of fluorite and quartz
Fatty acid is used as a collecting agent to collect fluorite, and
water glass is used as an inhibitor to inhibit quartz. When the
amount of water glass is small, the effect of inhibiting quartz is
poor, but fluorite can be activated in flotation. If the water
glass is excessive, it will inhibit the flotation of fluorite.
Therefore, the amount of water glass should be properly controlled.
In order to enhance the inhibitory effect of water glass on quartz,
certain polyvalent metal ions can be added, which not only inhibits
quartz, but also inhibits calcite.