Preparation method and preparation apparatus for ultrafine heavy calcium coating filler

Abstract

The invention discloses a preparation method and a preparation apparatus for ultrafine heavy calcium coating filler. The preparation method comprises the following steps: subjecting calcium carbonate mineral raw powder with a particle size of 325 meshes to addition of water, addition of a dispersant, blending and stirring; pumping an obtained substance into a feed hopper through a pump, setting a flow rate by using the feed hopper and allowing the substance to enter into a grinding machine composed of white corundum resin abrasive plates and green silicon carbide resin abrasive plates for grinding; then carrying out screening so as to obtain heavy calcium coating filler with solid content of 70% and with more than 60% of particles having a particle size of less than 2 mu m; and screening out a semi-finished product, pumping the semi-finished product into the hopper again and carrying out secondary grinding. The apparatus comprises a raw material stirring barrel; the raw material stirring barrel is connected with the hopper on a circular millstone through a raw material pump and a pipeline. The apparatus is characterized in that the lower part of the hopper is provided with the circular millstone composed of white corundum resin abrasive plates and green silicon carbide resin abrasive plates, a material receiving groove is arranged at the lower part of the periphery of the circular millstone and is communicated with the inlet of a screening machine through a discharging pipe, the discharge outlet of the screening machine is connected with a material barrel, a material located on a screen of the screening machine flows into a semi-finished product stirring barrel, and the semi-finished product stirring barrel is communicated with the hopper on the circular millstone through a semi-finished product pump and a pipeline.

Description

technical field [0001] The invention relates to the wet grinding technology of calcium carbonate, that is, a preparation method and equipment for superfine heavy calcium coated filler. Background technique [0002] Heavy calcium coating filling pigment is made of calcium carbonate minerals such as calcite through wet grinding. It is a commonly used white inorganic filler and coating pigment, widely used in papermaking, coatings and other industries. [0003] At present, heavy calcium coating filling pigments are generally made by multi-stage grinding with a grinder, and each stage of grinding must go through steps such as pulping, grinding, buffering, and screening. During grinding, grinding beads and various dispersants must be added. , the process is relatively complicated, high energy consumption, low output, wide and uneven particle size distribution, a lot of manpower, and the power consumption per ton of product is above 140 degrees. Contents of the invention [000...

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Problems solved by technology

[0003] At present, heavy calcium coating filling pigments are generally made by multi-stage grinding with a grinder, and each stage of grinding must go through steps such as pulping, grinding, buffering, and screening. During grinding, grinding beads and various dispersants must be added. , the process is relatively complicated, high energy consumption, low output, wide and uneven particle size distribution, a lot of manpower, and the power consumption per ton of product is above 140 degrees

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