Preparation method of calcined kaolin with controllable oil suction value
A technology of calcining kaolin and oil absorption value, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of inconsistent product particle size, high processing cost, high raw material cost, etc., and achieve narrow particle size distribution, easy operation, The effect of low raw material cost
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[0025] The invention provides a method for preparing calcined kaolin with controllable oil absorption value, comprising the following steps: (1) crushing raw kaolin ore and wet grinding to obtain raw material slurry; (2) preparing the raw material slurry obtained in step (1) Adding a dispersant in the middle makes the mixed slurry, and the mixed slurry is introduced into the settling equipment for sedimentation; (3) the upper mixed slurry after settling in the step (2) is exported and centrifuged, and the separated liquid is dried and calcined respectively, and the upper layer The separation liquid is calcined to obtain calcined kaolin with high oil absorption value, and the lower layer separation liquid is calcined to obtain calcined kaolin with low oil absorption value.
[0026] The existing methods for preparing calcined kaolin can only produce calcined kaolin products of a single type with high oil absorption value or low oil absorption value, and the fineness of calcined k...
Embodiment 1
[0038] refer to figure 1, the preferred embodiment of the present invention discloses a method for preparing calcined kaolin with controllable oil absorption value. The raw material is coal-measure kaolin raw ore in Qingshuihe area, Inner Mongolia, and the above-mentioned kaolin raw ore is crushed to a particle size of less than 15mm by a coarse crushing system, and mixed with water. into a slurry with a concentration of 50wt.%, and then sent to a vertical wet grinder for rough wet grinding to obtain a coarsely ground slurry, which is ground until the proportion of the slurry particle size less than 2 μm in the coarse abrasive slurry is greater than 40wt.%. After adding the dispersant sodium hexametaphosphate 2‰ by weight according to the viscosity of the slurry, it is introduced into a settling tank for settling.
[0039] After settling in the settling tank for 2 hours, 1 / 4 volume of the upper slurry in the settling tank was exported, and after stirring evenly, it was measure...
Embodiment 2
[0041] This example is basically the same as Example 1, the difference is that after the raw material slurry added with dispersant settles in the settling tank for 48 hours, 1 / 4 volume of the upper slurry in the settling tank is separated, and the particle size is measured to be less than 2 μm after stirring evenly The proportion of 91wt.%, after centrifugation, the upper separation liquid and the lower separation liquid were concentrated, dried, depolymerized, calcined, depolymerized again to obtain calcined kaolin products. Among them, the proportion of the upper separation liquid with a particle size of less than 2 μm is 93wt.%, and the oil absorption value is 80; the proportion of the lower separation liquid with a particle size of less than 2 μm is 84wt.%, and the oil absorption value is 50.
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