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Heavy calcium carbonate slurry dewatering and drying method

A dehydration technology for heavy calcium carbonate and slurry, which is applied in the fields of calcium carbonate/strontium/barium, chemical instruments and methods, calcium/strontium/barium compounds, etc. It can solve the problem that the particle size of dry grinding products cannot reach the particle size of high-end products Requirements, failure to solve the problems of low solid content grinding and grading of slurry, low-end product quality is not stable enough, etc., to achieve the effect of preventing bridging, reducing process cost, and stabilizing slurry flow

Active Publication Date: 2018-04-20
广西河池华泰新材料科技有限公司
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AI Technical Summary

Problems solved by technology

[0002] At present, the preparation technology of heavy calcium carbonate is mainly dominated by dry grinding and water grinding, and its technology cannot meet the requirements of high-end products in the market due to the limitation of equipment; the main defects of dry grinding are: the particle size of dry grinding products cannot meet the particle size requirements of high-end products , the quality of middle and low-end products is not stable enough; the defects of water mill are reflected in: the process of slurry particle size screening is not perfect, and the grinding classification of low solid content of slurry cannot be solved; the grinding of high solid content is due to the grinding of minerals, the particles are continuously crushed, and the surface area Multiplied, in order to maintain the fluidity and grinding efficiency of the slurry, we can only add grinding aids to the wet grinding, and the grinding aids are just unacceptable for some high-end products;

Method used

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  • Heavy calcium carbonate slurry dewatering and drying method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] like figure 1 Shown, a kind of heavy calcium carbonate slurry dehydration drying method comprises the following steps

[0028] a) preparation slurry: solid calcium carbonate is mixed with water, is mixed with the slurry that calcium carbonate content is 20%;

[0029] b) Wet grinding: the slurry is ground by wet grinding to obtain a primary slurry, the calcium carbonate content of the primary slurry is 30%, -2um 30%, +25um25ppm;

[0030] c) Classification: make the primary slurry enter the separator for separation, separate the secondary slurry, the calcium carbonate content of the secondary slurry is 25%, -2um 40%, +25um 5ppm;

[0031] d) Centrifugal dehydration: The graded secondary slurry passes through a 500-mesh vibrating screen, and the sieved slurry is pumped into the slurry buffer tank by the slurry pump. The temperature of the sieved slurry is 40°C, and the dehydration centrifuge is started. The rotation speed is 1700rpm, the feed rate is 5500L / h, the slurry i...

Embodiment 2

[0034] like figure 1 Shown, a kind of heavy calcium carbonate slurry dehydration drying method comprises the following steps

[0035] a) preparation slurry: solid calcium carbonate powder is mixed with water, is mixed with the slurry that calcium carbonate solid content is 25%;

[0036] b) Wet grinding: the slurry is ground by wet grinding to obtain a primary slurry, the solid content of calcium carbonate in the primary slurry is 37.5%, -2um45%, +25um32ppm;

[0037] c) Classification: make the primary slurry enter the separator for separation, separate the secondary slurry, the solid content of calcium carbonate in the secondary slurry is 28%, -2um 55%, +25um 10ppm;

[0038] d) Centrifugal dehydration: The graded secondary slurry is passed through a 500-mesh vibrating screen, and the sieved slurry is pumped into the slurry buffer tank by the slurry pump, and the temperature of the sieved slurry is 42°C; start the dehydration centrifuge, and the dehydration centrifuge The rot...

Embodiment 3

[0041] like figure 1 Shown, a kind of heavy calcium carbonate slurry dehydration drying method comprises the following steps

[0042] a) preparation slurry: solid calcium carbonate is mixed with water, is mixed with the slurry that calcium carbonate solid content is 35%;

[0043] b) Wet grinding: the slurry is ground by wet grinding to obtain a first-grade slurry with a calcium carbonate solid content of 40%, -2um 60%, +25um 40ppm;

[0044] c) Classification: make the primary slurry enter the separator for separation, separate the secondary slurry, the solid content of calcium carbonate in the secondary slurry is 30%, -2um 70%, +25um 15ppm;

[0045]d) Centrifugal dehydration: the graded secondary slurry passes through a 500-mesh vibrating screen, and the sieved slurry is pumped into the slurry buffer tank by the slurry pump, and the temperature of the sieved slurry is 45°C; start the dehydration centrifuge, and the dehydration centrifuge The rotation speed is 2100rpm, the fe...

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Abstract

The invention discloses a heavy calcium carbonate slurry dewatering and drying method, relating to the field of a heavy calcium carbonate production technique. The method comprises the following steps: slurry preparation, wet milling, grading, centrifugal dewatering, and dispersing and drying, thereby completing the dewatering and drying of the heavy calcium carbonate slurry. On the basis of grading the water-milled slurry, the heavy calcium carbonate slurry dewatering and drying technique is changed, thereby satisfying the requirements for the subsequent drying technique after slurry grading,and laying the foundation for production of high-quality high-end products. The water content of the product in the invention is 0.02-0.05%, and the product does not agglomerate.

Description

technical field [0001] The invention relates to the field of heavy calcium carbonate production technology, in particular to a method for dehydrating and drying heavy calcium carbonate slurry. Background technique [0002] At present, the preparation technology of heavy calcium carbonate is mainly dominated by dry grinding and water grinding, and its technology cannot meet the requirements of high-end products in the market due to the limitation of equipment; the main defects of dry grinding are: the particle size of dry grinding products cannot meet the particle size requirements of high-end products , the quality of middle and low-end products is not stable enough; the defects of water mill are reflected in: the process of slurry particle size screening is not perfect, and the grinding classification of low solid content of slurry cannot be solved; the grinding of high solid content is due to the grinding of minerals, the particles are continuously crushed, and the surface ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18
CPCC01F11/185C01P2006/82
Inventor 陶勇
Owner 广西河池华泰新材料科技有限公司
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