Preparation method of calcined kaolin with low abrasion value
A technology of calcined kaolin and low wear, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve problems such as product brightness or other required performance loss, and achieve low cost, easy operation, and easy dispersion.
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Embodiment 1
[0020] Embodiment 1: The preparation method of this low-wear calcined kaolin adopts the following process.
[0021] 1. The raw ore is selected from coal-measure kaolinite associated with Carboniferous-Permian coal, and the molar ratio of silicon to aluminum: SiO 2 / Al 2 o 3 =2.0; pick out miscellaneous stones and impure raw ore, and wash off the sediment on the surface of the raw ore with water;
[0022] 2. Crush the cleaned raw ore, and then grind it into powder, with a 325-mesh sieve remaining ≤ 5%;
[0023] 3. Wet grinding of powdery raw materials: the equipment used is ultra-fine grinding and peeling machine, and the grinding medium is selected from zirconium-aluminum composite beads with self-wearing less than 1‰, and its specific gravity is 3.0-3.5g / cm 3 , Particle size ratio (1 ~ 1.5mm): (1.5 ~ 2mm): (2 ~ 2.5mm) = (0 ~ 10%): (30 ~ 40%): (50 ~ 60%); dispersant selection six Sodium metaphosphate, adding 2.3‰ of the dispersant during the pulping process, adding part o...
Embodiment 2
[0029] Embodiment 2: The preparation method of this low-wear calcined kaolin is the same as that of Embodiment 1 except for the following differences.
[0030] Step 1. The raw ore is selected from kaolin concentrate associated with Carboniferous-Permian coal, and the molar ratio of silicon to aluminum: SiO 2 / Al 2 o 3 =1.9;
[0031] Step 3. The solid content of the wet grinding slurry is 44%, the slurry particle size (-2μ,%) = 94%, D50 = 0.65μm; the dispersant is sodium polyacrylate, and the dispersant is added in the process of adding 3‰ , add a part dropwise during the wet milling process, but the total amount of sodium polyacrylate = 6.5‰.
[0032] Step 5. Raw meal particle size (-2μ,%)=92.5%, D50=0.72μm; the obtained raw meal Einlehner wear value is 10mg / 100000rpm;
[0033] Step 6. Calcination conditions: temperature 875°C, holding time 1h;
[0034] Step 7. Clinker break-up particle size (-2μ,%)=86.5%, D50=0.81μm.
[0035] The calcined kaolin obtained in this embodi...
Embodiment 3
[0036] Embodiment 3: The preparation method of this low-wear calcined kaolin is the same as that of Embodiment 1 except for the following differences.
[0037] Step 1. The raw ore is selected from kaolin concentrate associated with Carboniferous-Permian coal, and the molar ratio of silicon to aluminum: SiO 2 / Al 2 o 3 =2.1;
[0038] Step 3. The solid content of the wet grinding slurry is 42%, the slurry particle size (-2μ,%) = 93.5%, D50 = 0.8μm; the dispersant is sodium polyacrylate, and the dispersant is added in the process of adding 2.3‰ , a part is added dropwise during the wet grinding process, but the total amount of sodium polyacrylate = 6.0‰.
[0039] Step 5. Raw meal particle size (-2μ,%)=92%, D50=0.9μm; the obtained raw meal Einlehner wear value is 10mg / 100000rpm;
[0040] Step 6. Calcination conditions: temperature 900°C, holding time 0.5h;
[0041] Step 7. Clinker break-up particle size (-2μ,%)=86%, D50=1.0μm.
[0042] The calcined kaolin obtained in this e...
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