Talc is widely used in our daily life. Pure talc ore is rare, usually associated with other minerals, such as chlorite, magnesite, tremolite, dolomite, siderite, quartz, pyrite, etc. . These minerals change the chemical composition of the ore, make the ore color, and significantly affect the physical properties of the ore. In order to improve the quality of talc and meet the needs of industrial production, we need to process the talc. There are many methods for talc beneficiation technology. It is very important to choose the appropriate mineral processing technology and method. According to the preliminary analysis and testing of minerals, the ore dressing test is the most suitable.
Talc is named for its soft texture and strong slippery feel. Talc has high electrical insulation, heat insulation, high melting point and strong adsorption properties to oils, so it has a wide range of applications in the industry. Among them, the talc consumed by the paper industry accounts for about 60% of the total. In addition, talc is widely used in many fields such as medicine, chemical industry, textile, ceramics and sculpture. The paper industry requires low levels of talc iron. Therefore, the coloring element impurities such as iron, manganese, nickel and titanium are harmful impurities. We need to remove iron from talc to obtain high quality talc.
(1) Flotation
Since talc is naturally floatable, it can be floated with a hydrocarbon oil collector. The commonly used collector is kerosene, and the flotation oil acts as a foaming agent. Methyl isobutylmethanol. The foam produced is brittle and it is easy to obtain high quality fine powder. The talc flotation process is relatively simple, only one rough selection and sweeping, and the final concentrate can be obtained in 3-4 times of selection, but the talc concentrate is fine in size and dehydration is difficult.
(2) Hand selection
Hand selection is based on the slipperiness of talc and gangue minerals. Talc has good slipperiness, the higher the grade, the better the slipperiness, and it is easy to identify by hand. Most of the talc mines in China use hand-selected high-grade talc blocks. In recent years, foreign countries have successfully researched a sorting machine called slinger, which can separate the talc from the gangue according to the different friction coefficient of the ore, thus realizing the mechanization of talc hand selection.
(3) Electrostatic dressing
In addition to talc, talc contains minerals such as magnesite, magnetite, magnetic pyrite, tremolite, and the inlaid grain size is about 0.5 mm. In the electrostatic field, the talc has a negative charge, and the magnesite band is positive. The charge, while magnetite and magnetic pyrite are good conductors, so it is easy to separate the appeal minerals in the electric field.
(4) Magnetic separation
In addition to requiring a little fineness and purity, talc concentrate must also have the first Baidu. Due to the presence of dyed iron minerals in the ore, flotation alone is not sufficient, and magnetic separation is sometimes required to remove iron-containing materials. The Soviet Union and Canada have examples of magnetic separation and iron removal. The use of wet magnetic separation can reduce the iron content of talc concentrate from 4-5% to 0.7.
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