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2021
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Influencing Factors and Improving Methods of Whiteness of Light Calcium Carbonate
light calcium carbonateWhat are the influencing factors of whiteness? How to improve the whiteness of light calcium carbonate, let's take a look at it in detail.
Influencing Factors of 1. the Whiteness of Light Calcium Carbonate
1. Quality of limestone. Limestone is the main factor that affects light calcium carbonate, and the main chemical components that affect whiteness are iron, manganese and hydrochloric acid such as iron, manganese and hydrochloric acid. Iron is mainly in the Fe3 form of calcium carbonate, which is the main reason for the reduction of light calcium carbonate. Therefore, the whitening of light calcium carbonate removes iron elements by physical methods and chemical methods.
2. Calcination. In the mineral phase, the quality of limestone does not meet the standard, the impurity content is too high, many dangerous impurities such as silica, alumina, iron oxide, etc., when calcined, calcined to form a low melting point low melting point, connected to the surface of calcium oxide, and the product is reduced.
3. Digestion. Different digestion devices have different effects under whiteness, affecting digestion trough is small, blade digestion and secondary, drum digestion are affected.
4. Refined. The refining process is one of the important factors affecting the whiteness of the slurry, and the quality of the slurry can make the whiteness difference. Refining is out of yellow, black impurities, more complete, the higher the whiteness.
2. Method for Improving Whiteness of Light Calcium Carbonate
1, the production of light calcium carbonate, low ore quality, directly affect the whiteness of the product. Therefore, the whiteness of the light calcium carbonate is then started from the selection of the original gear. When the limestone content ≤ 0.12%, the manganese content ≤ 0.006%, the solvent content of hydrochloric acid ≤ 0.30%, which can basically meet the whiteness of calcium carbonate.
When the iron content exceeds 0.2%, the product will be yellow or even red, which will reduce the whiteness. At this time, it is necessary to treat iron pollution by chemicals. If the equipment causes iron contamination, it can also be treated. Deal with this method, otherwise it will reduce the whiteness.
3. If other impurities in the ore are excellent, it will also cause a small whiteness. In this case, the whiteness must be increased as much as possible by the multistage slag, which is usually an improved ore. If it contains high color minerals, bleaching technology should be used to improve the whiteness of light calcium carbonate.
4, according to the limestone andlight calcium carbonateof pigment ions, which are used to reduce bleaching or oxidation processes.
5. In addition, it is necessary to strengthen management, improve equipment level, and maintain and maintain equipment in time!
Light calcium carbonate
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