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A technology of kaolin and slurry, applied in the direction of chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of low whiteness and low iron removal rate, etc., to increase market price, high utilization rate, and improve utilization efficiency Effect
Inactive Publication Date: 2016-02-17
中国高岭土有限公司
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Problems solved by technology
[0003] The invention provides a kaolin bleaching method, which solves the problems of lo
Method used
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Embodiment 1
[0018] Embodiment one: a kind of bleaching method of kaolin
[0019] Described bleaching method comprises the following steps in turn:
[0020] In the first step, the raw ore of kaolin in Zhangzhou, Fujian is hydrated into raw pulp, and the mass percentage concentration of the raw pulp is controlled at 20%, and then the raw pulp is subjected to sand removal and grading treatment by a cyclone with a diameter of Φ150 mm to obtain a slurry. The mass percentage concentration of the slurry is 15%; the slurry is sampled for suction filtration and drying to detect the iron content of kaolin (referring to the mass percentage content) and natural whiteness;
[0021] In the second step, adding sulfuric acid to the slurry obtained in the first step to adjust the pH, so that the pH value of the slurry is 2.5, and then placing the adjusted pH value of the slurry in a closed container with stirring;
[0022] In the third step, according to the volume of the airtight container, the mass per...
Embodiment 2
[0028] Embodiment two: a kind of bleaching method of kaolin
[0029] Described bleaching method comprises the following steps in turn:
[0030] In the first step, the raw ore of kaolin in Zhangzhou, Fujian is hydrated into raw pulp, and the mass percentage concentration of the raw pulp is controlled at 25%, and then the raw pulp is subjected to sand removal and grading treatment by a cyclone with a diameter of Φ150 mm to obtain a slurry. The mass percent concentration of the slurry is 20%; samples are taken from the slurry for suction filtration and drying to detect the iron content of kaolin (referring to the mass percent content) and natural whiteness;
[0031] In the second step, sulfuric acid is added to the slurry obtained in the first step to adjust the pH, so that the pH value of the slurry is 3.0, and then the adjusted pH value of the slurry is placed in a closed container with stirring;
[0032]In the third step, according to the volume of the airtight container, the...
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Abstract
A kaolin bleaching method is characterized by comprising steps as follows: water is added to kaolin raw ore, a raw stock is formed and subjected to sand removal and stage treatment by a hydrocyclone, and slurry is prepared; sulfuric acid is added to the slurry, the pH (potential of hydrogen) is adjusted to range from 2.0 to 3.0, and the slurry is placed in a closed container with a stirring function; the solid content of kaolin in the slurry in the closed container is measured, sodium hydrosulfite is added, and the adding amount of sodium hydrosulfite is 0.5%-1% of the solid content of the kaolin; then, the mixture is stirred for 4-8 min each time and reacts for 4-8 h; sodium hydrosulfite is added to the slurry obtained in the third step, and the adding amount of sodium hydrosulfite is 0.5%-1% of the solid content of the kaolin; the mixture is stirred again for 4-8 min each time and reacts for 4-8 h; after a reaction ends, EDTA (ethylene diamine tetraacetic acid) is added, the adding amount of EDTA is 0.1%-0.5% of the solid content of the kaolin, and the mixture is stirred uniformly; filter pressing is performed, and a bleached kaolin product is obtained. By means of the bleaching method, a remarkable deironing and whitening effect can be achieved, and the market price of the kaolin product is greatly increased.
Description
technical field [0001] The invention relates to the field of deep processing of clay minerals, in particular to a kaolin bleaching method, which belongs to a mineral processing method, and the kaolin prepared by the bleaching method of the invention can be especially used in ceramics, coatings, etc., which require high whiteness of kaolin industry. Background technique [0002] As a major impurity of kaolin, iron is the main factor affecting its whiteness. In particular, kaolin is used in ceramics, coatings and other industries, which have higher requirements for the whiteness of kaolin. In the current situation where the grade of kaolin raw ore continues to decline, iron removal has become a more important issue. Existing iron removal methods include chemical iron removal and physical iron removal. Physical iron removal generally uses a magnetic separator, but limited to the current technology, it is difficult to effectively and completely remove the impurity iron in kao...
Claims
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Application Information
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