In order to improve the sorting effect of the electric sorter, different preparations should be taken according to the nature of the material and operating conditions before clicking. Commonly used preparation operations include drying, de-sludge and grading of materials, and surface treatment.
(1) Drying
There are many methods for drying. In the laboratory, a constant temperature drying oven can be used. In the production, there are commonly used drum dryers, air flow dryers, boiling dryers, and drying ovens. The requirements of the product, equipment manufacturing, floor space, labor conditions, etc. can be selected according to the nature of the material.
(2) Desliming and grading
In the cylindrical electric separator, since the centripetal force required for the circular movement of the coarse ore particles is large, the coarse ore particles are preferentially enriched in the conductor product, and the fine ore particles are preferentially enriched in the non-conductor product. In order to avoid this sorting by particle size, the material often needs to be sieved before electro-election. When the material contains a large amount of fine ore particles (less than 40 microns), the separation process is affected because the fine ore particles will stick to the grounded cylinder electrode, generate dust and cause spark discharge between the high voltage electrode and the ground electrode. Destruction, so it needs to be degreased beforehand.
The grading of the electrified material is generally carried out by dry sieving, sometimes by wind grading, or in a box type electric sorter.
(3) Mineral surface treatment
The effect of electrification depends to a large extent on the surface condition of the mineral. The surface condition of minerals can sometimes be artificially altered by pretreatment methods, for example, by treatment with chemicals to remove certain components from the mineral surface, allowing the mineral surface to selectively adsorb the agent to form a new surface film. Selectively change the conductivity of different minerals to facilitate sorting.
At present, the drying tower of the corn drying tower is operated in succession. The tower is installed outdoors. The dry tower is composed of storage layer, dry layer, tempering layer, cooling section, grain unloading organization, emergency grain unloading organization, tower, hot air suction organization, moisture removal organization, hot air fan organization, cooling fan organization, required motor and others Components. Commonly used in large-scale grain storage projects. Suitable for dryness of rice, sorghum, soybean, corn, wheat and other cereals.
During the dry period at the top, the high-heat air rapidly warms the grain and removes part of the surface of the particles.
In the moderate heating stage, a large amount of water is taken away by the moderately heated air.
After passing through the high heat and medium heat stages, the temperature of the particles increases, so low heat air is used in the dry stage at the bottom. Low-calorie air can easily remove the moisture inside the grain, but it is necessary to prevent the grain temperature from being too high.
The dry grain enters the cooling stage. After sufficient cooling, the grain with moisture and temperature can directly enter the silo for storage.
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