01
Talc hand selection purification
Hand selection principle: Picking according to the slipperiness of talc and gangue minerals.
Hand selection purpose: Separate the block-like associated minerals in advance.
Features: This method can only be used for the sorting of high-grade talc mines, and has high requirements on the experience of the ore dressing workers. It has great limitations and is gradually being replaced by photoelectric color selection.
02
Talc color selection and purification
The principle of color selection: using the characteristics of talc emitting white fluorescence under ultraviolet light, the pure talc is sorted by a color sorter.
For example, the United States Cyprus talc company used a color-selection method to enrich a lean ore with a talc content of 30% to a rich ore with a talc content of 69%. Finally, it was ground to 200 mesh for flotation to obtain a cosmetic grade talc with a grade of 99%.
03
Selective crushing and sieving purification of talc
Using the difference in selective crushing and shape of talc and gangue minerals, most of the associated quartz and more than 50% of carbonate minerals can be separated by impact crushing and alternating use of rectangular and square sieves for continuous screening. .
04
Talc scrubbing purification
Scrubbing principle: A method in which talc and its associated minerals are separated by adding acid or a certain agent to water, using the difference in water solubility and sedimentation speed of talc and associated minerals in aqueous solution in talc.
Characteristics: The recovery rate of this method is low. Because the specific gravity difference between talc and its associated minerals is small, it is very likely that talc will also be used as the associated minerals.
05
Talc electrification purification
Principle of electro-election method: According to the difference of conductivity between talc and magnesite minerals such as magnesite and magnetite, the method of sorting in high-voltage electric field is carried out. Including electrical selection, electric grading, triboelectric charging sorting, high gradient sorting, dielectric sorting, electric dust removal, etc.
The purpose of electrification method is to remove impurities such as magnesite, magnetite, sulphur iron or tremolite.
Features: Electrification can be used for rough selection of talc or for the selection and tailings.
06
Talc magnetic separation purification
Principle of magnetic separation: According to the magnetic difference between talc and associated minerals, magnetic separation equipment is used to sort useful minerals and associated minerals under the action of magnetic force and Other forces.
Magnetic separation purpose: to remove magnetic impurities such as siderite, pyrite, tremolite.
Features: The magnetic separation method is widely used in the non-metal industry. Research shows that the appropriate magnetic separation process and equipment can reduce the iron content of talc concentrate from 4% to 5% to less than 1%.
07
Selective flocculation and purification of talc
The principle of selective flocculation: the use of chemicals to flocculate fine-grained talc to achieve separation from associated minerals.
Commonly used agents: cyparone, ethylene glycol and polyethylene oxide.
Characteristics: Selective flocculation is a method for treating mud-like fine-grained talc. It can be used as a pre-treatment stage for talc ore flotation. If a foaming agent is added, flotation can be used for sorting.
08
Talc flotation purification
Flotation principle: Talc is completely symmetrical in crystal structure. It is a non-polar molecule with a hydrophobic surface. The surface of other minerals associated with it is hydrophilic and can be purified by flotation.
Common equipment or pharmacy: collector (such as kerosene), foaming agent (floating oil No. 2, methyl isobutyl methoxide), activator (such as sulfuric acid), inhibitor (usually lime), pH adjustment of pulp Agent (sulfate and lime).
Features: For low-grade talc mines, generally need to be flotation to improve the grade. The talc flotation process is relatively simple. Most talc mines require only one rough selection, one sweep, and two to four selections to obtain the final concentrate.
09
Talc calcination purification
Calcination principle: According to the mineral composition, the talc is calcined at 1200-1300 ° C, and sieved and magnetically selected.
Purpose of calcination: removal of carbon-containing impurities such as graphite schist.
Features: This method is mainly used to treat black talc. The higher the temperature, the higher the whiteness of talc after calcination, and the physical and chemical properties such as the activity of talc can be greatly improved.
10
Talc chemical treatment purification
Principle of chemical treatment: treatment of dolomite-type talc with hydrochloric acid, bleaching agent, etc.
Chemical treatment purposes: remove calcium carbonate minerals, quartz particles and iron-containing impurities to improve whiteness.
Commonly used agents: hydrochloric acid, sodium dithionite, etc.
In the talc industrial production process, the more commonly used purification methods are a combination of various methods. According to the characteristics of China's talc mine resources, if you want to purify, remove, and whiten talc ore and talcum powder, you need to be familiar with the mineral characteristics of regional talc itself, choose a suitable purification method, learn from each other, and realize low-cost purification of talc. .
Ningbo Kyson Cool Electronic Technology Co., Ltd. , https://www.kysonrefrigeration.com