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Preparation method of calcium carbonate for cigarette paper

A technology of calcium carbonate and cigarette paper, applied in the direction of calcium carbonate/strontium/barium, inorganic compound addition, etc., can solve problems such as reducing strength

Active Publication Date: 2009-09-23
SHANGHAI DONGSHENG NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0021] The technology of the above-mentioned patents and literature reports can not meet the above-mentioned requirements. Therefore, the research and development of special calcium carbonate that can improve the air permeability of cigarette paper and make the paper maintain or reduce the strength as much as possible and have certain characteristics is very important to the relevant industry departments. Expected

Method used

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  • Preparation method of calcium carbonate for cigarette paper

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Preparation of Zinc Hydroxide Seed Crystals:

[0037] Add 430kg of zinc sulfate heptahydrate and 1000kg of water into a 3 cubic meter reaction kettle to make a zinc sulfate solution;

[0038] Add 120kg of solid sodium hydroxide and 1000kg of water into a 2 cubic meter reactor to make a sodium hydroxide solution;

[0039] Sodium hydroxide solution was added in the constantly stirring zinc sulfate solution, and the flow rate of sodium hydroxide solution was adjusted so that the addition time was controlled at 5 hours to obtain 2550 kg of zinc hydroxide seed crystal slurry;

[0040] The calcium hydroxide slurry that 8000kg weight solid content is 10% joins in the carbonization tower of 12 cubic meters, adds above-mentioned zinc hydroxide seed crystal slurry 680kg in the carbonization tower, passes into carbon dioxide 25% ( volume) mixed gas, carbonized to pH 6.5 to obtain calcium carbonate slurry for cigarette paper, filter and wash the calcium carbonate slurry with a pla...

Embodiment 2

[0042] Preparation of Zinc Hydroxide Seed Crystals:

[0043] Add 447kg of zinc nitrate hexahydrate and 1000kg of water into a 3 cubic meter reaction kettle to make a zinc nitrate solution.

[0044] Add 168kg of solid potassium hydroxide and 1000kg of water into a 2 cubic meter reactor to make a potassium hydroxide solution. Potassium hydroxide solution was added to the constantly stirring zinc nitrate solution, and the flow rate of potassium hydroxide solution was adjusted so that the addition time was controlled at 3 hours to obtain 2615 kg of zinc hydroxide seed crystal slurry.

[0045]The calcium hydroxide slurry that 8000kg weight solid content is 25% joins in the carbonization tower of 12 cubic meters, adds above-mentioned zinc hydroxide seed crystal slurry 1800kg in the carbonization tower, passes into carbon dioxide 10% ( volume) mixed gas, carbonized to pH 7.5 to obtain calcium carbonate slurry for cigarette paper, filter and wash the calcium carbonate slurry with a p...

Embodiment 3

[0047] Preparation of Zinc Hydroxide Seed Crystals:

[0048] Add 20kg of zinc acetate and 500kg of water into a 2 cubic meter reaction kettle to make a zinc acetate solution.

[0049] Add 64kg of 40% liquid caustic soda and 500kg of water into a 1 cubic meter reactor to make a caustic soda solution.

[0050] The caustic soda solution was added to the constantly stirring zinc acetate solution, and the flow rate of the caustic soda solution was adjusted so that the adding time was controlled at 2 hours to obtain 1084 kg of zinc hydroxide seed crystal slurry.

[0051] The calcium hydroxide slurry that 8000kg weight solid content is 8% joins in the carbonization tower of 12 cubic meters, adds above-mentioned zinc hydroxide seed crystal slurry 1000kg in the carbonization tower, passes into carbon dioxide 27% ( volume) mixed gas, carbonized to pH 7.1 to obtain calcium carbonate slurry for cigarette paper, filter and wash the calcium carbonate slurry with a plate and frame filter pr...

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Abstract

The invention provides a preparation method of calcium carbonate for cigarette paper and comprises the steps that: 1. alkaline material aqueous solution is added in soluble zinc salt to get crystal seed zinc hydroxide aqueous solution; 2. crystal seed zinc hydroxide aqueous solution in step 1 is added into calcium hydroxide aqueous slurry, carbonized through carbon dioxide gas until pH is between 6.5-7.5 to get calcium carbonate slurry, and then calcium carbonate is collected for cigarette paper from the calcium carbonate slurry. The calcium carbonate produced by the preparation method can be applied as filling to the cigarette paper, thereby improving the whiteness, opacity, air permeability and tensile strength of the cigarette paper.

Description

technical field [0001] The invention relates to a preparation method of calcium carbonate, in particular to a preparation method of calcium carbonate for cigarette paper. Background technique [0002] Conventionally, inorganic fillers such as kaolin, talc, and calcium carbonate have been used as fillers for papermaking in order to improve the whiteness, opacity, and printability of paper. With the pH neutralization of the wet end of the paper machine, more and more light calcium carbonate is used. In order to improve the optical properties such as whiteness and opacity and printing adaptability when using it, the control of calcium carbonate particle shape, Particle size and other products. [0003] Calcium carbonate is an important inorganic filler. Due to its low price, wide range of raw materials, and non-toxicity, it is widely used as a filler in rubber, plastics, paper, paint, toothpaste, etc. Calcium carbonate is also one of the important raw materials for the produc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/18D21H17/66
Inventor 施晓旦王彦华
Owner SHANGHAI DONGSHENG NEW MATERIALS