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Preparation method for rice-grain-shaped light calcium carbonate

A technology of light calcium carbonate and calcium carbonate, applied in the direction of calcium carbonate/strontium/barium, chemical instruments and methods, nanotechnology, etc. , can not play the application effect and other problems, to achieve the effect of low cost, good dispersion, good economic benefits

Active Publication Date: 2018-05-29
山东宇信纳米科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the currently disclosed preparation technology, the obtained rice-shaped calcium carbonate has a large particle size and a small specific surface area. In fact, it is only an upgraded substitute for the spindle calcium carbonate, and it cannot exert its application effect.
[0017] To sum up, among the light calcium carbonate preparation technologies announced so far, there is no relevant report on the preparation of ultra-fine rice granular calcium carbonate, especially the rice granular calcium carbonate that can meet the absorbency requirements of the food and cosmetics industries.

Method used

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  • Preparation method for rice-grain-shaped light calcium carbonate
  • Preparation method for rice-grain-shaped light calcium carbonate
  • Preparation method for rice-grain-shaped light calcium carbonate

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Experimental program
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Effect test

Embodiment 1

[0036] A preparation method of rice granular light calcium carbonate, comprising the following steps,

[0037] Step 1, limestone is taken and calcined with natural gas to obtain calcium oxide;

[0038] Step 2. Mix calcium oxide and digested water according to the mass ratio of 1:5. After mixing, put it into a digestion kettle for digestion reaction. After the digestion reaction is completed, sieve it through a 320-mesh vibrating sieve, and remove impurities to obtain Calcium hydroxide essence, the calcium hydroxide essence is aged in the aging tank for 50 hours;

[0039] Step 3. Adjust the concentration of the aged calcium hydroxide fine slurry to 1.2mol / L, add a crystal form control agent of 0.4% by weight of limestone on a dry basis, and adjust the temperature to 30°C; the crystal form control agent includes ethylenediamine , a mixture of diethylenetriamine and triethylenetetramine, ethylenediamine, diethylenetriamine and triethylenetetramine are mixed in a ratio of 2:2:1. ...

Embodiment 2

[0053] A preparation method of rice granular light calcium carbonate, comprising the following steps,

[0054] Step 1, limestone is taken and calcined with natural gas to obtain calcium oxide;

[0055] Step 2. Mix calcium oxide and digested water according to the mass ratio of 1:5. After mixing, put it into a digestion kettle for digestion reaction. After the digestion reaction is completed, sieve it through a 320-mesh vibrating sieve, and remove impurities to obtain Calcium hydroxide essence, the calcium hydroxide essence is aged in the aging tank for 45 hours;

[0056] Step 3. Adjust the concentration of the aged calcium hydroxide fine slurry to 1.5mol / L, add a crystal form control agent of 0.5% by weight of limestone on a dry basis, and adjust the temperature to 33° C.; the crystal form control agent includes ethylenediamine , a mixture of diethylenetriamine and triethylenetetramine, ethylenediamine, diethylenetriamine and triethylenetetramine are mixed in a ratio of 1:1:1...

Embodiment 3

[0063] A preparation method of rice granular light calcium carbonate, comprising the following steps,

[0064] Step 1, limestone is taken and calcined with natural gas to obtain calcium oxide;

[0065] Step 2. Mix calcium oxide and digested water according to the mass ratio of 1:5. After mixing, put it into a digestion kettle for digestion reaction. After the digestion reaction is completed, sieve it through a 320-mesh vibrating sieve, and remove impurities to obtain Calcium hydroxide essence, the calcium hydroxide essence is aged in the aging tank for 60 hours;

[0066] Step 3. Adjust the concentration of the aged calcium hydroxide fine slurry to 1mol / L, add a crystal form control agent of 0.3% by weight of limestone on a dry basis, and adjust the temperature to 32° C.; the crystal form control agent includes ethylenediamine, A mixture of diethylenetriamine and triethylenetetramine, ethylenediamine, diethylenetriamine and triethylenetetramine are mixed in a ratio of 1:3:2. ...

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Abstract

The invention discloses a preparation method for rice-grain-shaped light calcium carbonate. The preparation method comprises the following steps: calcining lime stones with natural gas, adding digesting water to complete digesting reaction, performing screening, impurity-removal and ageing, adding a crystal form controller, introducing lime kiln kiln-gas to perform carbonization, pumping into a homogenizing tank to perform re-aging, and introducing purified, cooled and compressed lime kiln kiln-gas to perform secondary carbonation reaction, thereby preparing calcium carbonate slurry; and adding a modifying agent into the calcium carbonate slurry and stirring, and performing filter-pressing and dehydrating, drying, crushing and grading, thereby obtaining the rice-grain-shaped light calciumcarbonate. The light calcium carbonate crystal form prepared by the preparation method is rice-grain-shaped, has a long diameter of 150-200 nm, a short diameter of 30-50 nm, a BET specific surface area of 20-22 m<2> / g, a small length-diameter ratio, a high specific surface area and good dispersion, and can be used for manufacturing food and cosmetics; and moreover, the process is simple and feasible, the cost is low, the price is low, and the economic benefits are relatively good.

Description

technical field [0001] The invention relates to the technical field of preparation of light calcium carbonate, in particular to a preparation method of rice-shaped light calcium carbonate. Background technique [0002] Calcium carbonate is a new type of inorganic filler with the largest amount and the widest application. Due to its wide range of raw materials, low price and high whiteness, it is widely used in rubber, plastics, papermaking, sealing adhesives, coatings, wires, cables, inks, welding electrodes, Fillers and additives in organic synthesis, metallurgy, glass, asbestos industry, medicine, food, daily chemical, feed and other industries. It is a white powder material. [0003] Calcium carbonate is divided into two categories according to different production methods: the product obtained from calcite, marble, chalk, shell, limestone, etc. through mechanical crushing and ultra-fine grinding is heavy calcium carbonate, represented by GCC; limestone The product obtai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18B82Y40/00C09C1/02C09C3/08
CPCB82Y40/00C01F11/181C01F11/183C01P2004/30C01P2004/62C01P2004/64C01P2006/12C01P2006/19C01P2006/60C01P2006/80C01P2006/82C09C1/021C09C3/08
Inventor 杜年军颜干才
Owner 山东宇信纳米科技有限公司
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