Method for manufacturing rice-shaped precipitated calcium carbonate

A technology of precipitated calcium carbonate and manufacturing method, applied in the direction of calcium carbonate/strontium/barium, inorganic compound addition, pigmented coating, etc., can solve the problems of alkali discharge treatment and recovery, high cost of precipitated calcium carbonate, etc., to maintain printing quality, The effect of tight arrangement and reduced dosage

Inactive Publication Date: 2008-07-02
SHANGHAI DONGSHENG NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Method 2, method 3, for example, the cost of producing precipitated calcium carbonate according to the Chinese patent CN1264752C causticization method is too high, and there are problems such as alkali discharge, treatment and recovery after the reaction is completed

Method used

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  • Method for manufacturing rice-shaped precipitated calcium carbonate
  • Method for manufacturing rice-shaped precipitated calcium carbonate
  • Method for manufacturing rice-shaped precipitated calcium carbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] In a 2500ml beaker, add 1600g of lime emulsion with a concentration of 10wt%, then continue to add 1.6g of 1% sodium carbonate, stir and mix, then heat up to 15°C to start carbonization, with a stirring speed of 200rpm, react until the pH of the solution reaches 7.5, and then filter to obtain Cake 520g, measured average particle size 3.2 μm after drying (JL-1155 type laser particle size distribution tester of Chengdu Jingxin Powder Testing Equipment Co., Ltd.), crystal shape is rice grain shape (JSM-5300 scanning electron microscope observation of Japan Electronics Corporation) (see Figure 1).

Embodiment 2

[0021] In a 2500ml beaker, add 1600g of lime emulsion with a concentration of 20wt%, then continue to add 9.6g of 3% sodium bicarbonate, stir and mix, then heat up to 50°C to start carbonization, with a stirring speed of 200rpm, react until the pH of the solution reaches 6.5, and then filter to obtain The filter cake is 680g, and the average particle diameter after drying is 4.8 μm, and the crystal shape is rice grain.

Embodiment 3

[0023] In a 2500ml beaker, add 1600g of lime emulsion with a concentration of 30wt%, then continue to add 24g of 5% potassium carbonate, stir and mix and heat up to 60°C to start carbonization at a stirring speed of 200rpm, react until the pH of the solution reaches 8.0, and then filter to obtain 810g of filter cake After drying, the average particle size is 5.5 μm, and the crystal shape is rice grain.

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PUM

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Abstract

The invention provides rice-shaped precipitation calcium carbonate, a preparation method and the application thereof. The preparation method comprises the steps that: (1) crystal control agent is added into calcium hydroxide aqueous suspension to obtain mixture; (2) the mixture of the first step is communicated with carbon dioxide for carbonization reaction until the pH value of the mixture reaches 6.5-8.5 and the rice-shape calcium carbonate is collected from the reaction products; the crystal control agent is soluble carbonate. The rice-shape calcium carbonate of the invention has moderate length diameter ratio, which is easier to be maintained in paper fiber than ordinary light calcium carbonate, and increases the smoothness of the paper at the same time; furthermore, the invention not only preserves the printing quality of the paper, but also reduces the consumption of filler and increases retention rate, meanwhile, the manufactured paper has superior characteristics of high stiffness and high smoothness and has no problems of alkali recycling and discharging, being easy for implementing industrialized production.

Description

technical field [0001] The invention relates to a method for producing precipitated calcium carbonate. Background technique [0002] Adding inorganic fillers, such as calcium carbonate, in the papermaking process aims to improve the whiteness, opacity, smoothness, writing performance and ink absorption performance of paper products. In addition, due to the increase in the cost of wood pulp, cheap calcium carbonate has become a The first choice for fillers. Due to the gradual promotion of neutral and alkaline papermaking technology, the acid-resistant filler calcium carbonate has been widely used. [0003] Calcium carbonate for filler mainly includes heavy calcium carbonate and light calcium carbonate. The former comes from dry and wet mechanical crushing of natural limestone, while the latter comes from chemical reaction. [0004] However, after the heavy calcium carbonate mechanically pulverized from natural limestone is added into paper products, the whiteness, opacity, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18D21H17/67D21H19/38
Inventor 施晓旦王彦华顾明
Owner SHANGHAI DONGSHENG NEW MATERIALS
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