Method for preparing flower-sphere-shaped light calcium carbonate by using ultra-fine ground heavy calcium carbonate as seed crystal

A light calcium carbonate, ultra-fine grinding technology, applied in calcium carbonate/strontium/barium, chemical instruments and methods, calcium/strontium/barium compounds, etc., can solve the problem of poor light scattering ability of curd-shaped light calcium carbonate, etc. problem, to achieve the effect of mild reaction conditions and simple process equipment

Active Publication Date: 2019-07-02
DSSUN NEW MATERIAL SHANDONG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, although there is a process for preparing similar light calcium carbonate products, the light-scattering ability of the flower-shaped light calcium carbonate obtained is not good, and the particle size distribution is generally wide. In addition, it is still necessary to seek an updated preparation process and simplify the process flow. reduce manufacturing cost

Method used

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  • Method for preparing flower-sphere-shaped light calcium carbonate by using ultra-fine ground heavy calcium carbonate as seed crystal
  • Method for preparing flower-sphere-shaped light calcium carbonate by using ultra-fine ground heavy calcium carbonate as seed crystal
  • Method for preparing flower-sphere-shaped light calcium carbonate by using ultra-fine ground heavy calcium carbonate as seed crystal

Examples

Experimental program
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Embodiment 1

[0023] Take 1L of ultra-fine ground heavy calcium GCC95 protoplasm (solid content 75%, viscosity 220cP, D90=1.32μm) produced by Dongsheng New Materials (Shandong) Co., Ltd., add water to dilute to a solid content of 25%, and dilute it with 0.8-1.25mm silicon Zirconium acid beads are used as grinding media, and are ground to a particle size of D90 of 0.52 μm and D50 of 0.24 μm with a small grinder, and the ground heavy calcium slurry is used as a seed crystal. Then take 20L of fine pulp and pass it through 80-mesh nylon mesh, adjust it to a solid content of 16%, and add it to a self-made reaction kettle. Add GCC as the seed crystal according to the ratio of 20‰ of seed crystal GCC (dried) / PCC (dried), and stir for 10 minutes until uniform. The initial temperature is 37°C, the gas flow rate is 60L / h, the kiln gas concentration is 30%, the stirring speed is 700rpm, the carbonization is carried out by ventilation, and the carbonization is completed when the pH is less than or equa...

Embodiment 2

[0025] Take 1L of ultra-fine ground heavy calcium GCC95 protoplasm (solid content 75%, viscosity 220cP, D90=1.32μm) produced by Dongsheng New Materials (Shandong) Co., Ltd., add water to dilute to a solid content of 25%, and dilute it with 0.8-1.25mm silicon Zirconium acid beads are used as grinding media, and are ground to a particle size of D90 of 0.52 μm and D50 of 0.24 μm with a small grinder, and the ground heavy calcium slurry is used as a seed crystal. Then take 20L of fine pulp and pass it through 80-mesh nylon mesh, adjust it to a solid content of 16%, and add it to a self-made reaction kettle. Add GCC as a seed crystal at a ratio of 15‰ of seed crystal GCC (dried) / PCC (dried), and stir for 10 minutes until uniform. The initial temperature is 38°C, the gas flow rate is 60L / h, the kiln gas concentration is 30%, the stirring speed is 700rpm, the carbonization is carried out by ventilation, and the carbonization is completed when the pH is less than or equal to 7.5. Lig...

Embodiment 3

[0027] Take 1L of ultra-fine ground heavy calcium GCC95 protoplasm (solid content 75%, viscosity 220cP, D90=1.32μm) produced by Dongsheng New Materials (Shandong) Co., Ltd., add water to dilute to a solid content of 25%, and dilute it with 0.8-1.25mm silicon Zirconium acid beads are used as grinding media, and are ground to a particle size of D90 of 0.52 μm and D50 of 0.24 μm with a small grinder, and the ground heavy calcium slurry is used as a seed crystal. Then take 20L of fine pulp and pass it through 80-mesh nylon mesh, adjust it to a solid content of 16%, and add it to a self-made reaction kettle. Add GCC as a seed crystal at a ratio of 10‰ of seed crystal GCC (dried) / PCC (dried), and stir for 10 minutes until uniform. The initial temperature is 40°C, the gas flow rate is 60L / h, the kiln gas concentration is 30%, the stirring speed is 700rpm, the carbonization is carried out by ventilation, and the carbonization is completed when the pH is less than or equal to 7.5. Lig...

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Abstract

The invention discloses a method for preparing flower-sphere-shaped light calcium carbonate by using ultra-fine ground heavy calcium carbonate as a seed crystal. The method comprises the following steps: adding the ultra-fine ground heavy calcium carbonate used as the seed crystal into calcium hydroxide concentrate slurry, performing mixing, introducing carbon dioxide, and performing a carbonization reaction to obtain the flower-sphere-shaped light calcium carbonate, wherein an addition amount of the ultra-fine ground heavy calcium carbonate is 0.5-2% of a mass of the flower-sphere-shaped light calcium carbonate. According to the method provided by the invention, the flower-sphere-shaped light calcium carbonate prepared by the method is grown and arranged in a radioactive spherical shape by using the ultra-fine ground heavy calcium carbonate seed crystal as a core, the structure makes the flower-sphere-shaped light calcium carbonate have high light scattering ability, and paper whiteness and opacity can be significantly improved; and in addition, due to the induction action of the seed crystal, the efficiency of carbonization is improved, covering of un-reacted calcium hydroxide isreduced, so that the flower-sphere-shaped light calcium carbonate has extremely-narrow particle size distribution, and the spherical particles give good rheological properties to the slurry.

Description

technical field [0001] The invention relates to the field of preparation of paper-making fillers, in particular to a method for preparing flower-shaped light calcium carbonate by using superfine ground heavy calcium as crystal seeds. Background technique [0002] Light calcium carbonate is one of the most commonly used fillers in the paper industry. Using fillers instead of paper fibers can reduce production costs and improve the optical properties, printing properties and appearance of paper. As an important inorganic chemical raw material, light calcium carbonate may have different crystal shapes such as cubes, spindles, needles, chains, and flakes due to different preparation processes. The light calcium carbonate produced by the ordinary carbonization method is mostly spindle-shaped or needle-rod-shaped, with a wide range of particle size distribution, coarse particles, poor dispersion, and poor hiding power. [0003] CN1371947A discloses a new method for preparing nano...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18
CPCC01F11/181C01P2004/32C01P2004/61C01P2006/12C01P2004/03C01P2006/65
Inventor 施晓旦刘莹傅斌
Owner DSSUN NEW MATERIAL SHANDONG
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