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Aragonite type crystal seeds and aragonite type light calcium carbonate and preparation method thereof

A light calcium carbonate and aragonite-type technology, applied in calcium carbonate/strontium/barium, chemical instruments and methods, calcium/strontium/barium compounds, etc., can solve the problem of low solid content of calcium hydroxide, complex post-treatment process, Low production efficiency and other issues, to achieve the effect of stable product quality, low production cost, and industrialized production

Active Publication Date: 2019-03-15
DSSUN NEW MATERIAL SHANDONG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this method, the solid content of calcium hydroxide in the lime slurry is too low, the production efficiency is not high, the amount of magnesium chloride is large and the recovery is difficult, and the product post-treatment process is complicated

Method used

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  • Aragonite type crystal seeds and aragonite type light calcium carbonate and preparation method thereof
  • Aragonite type crystal seeds and aragonite type light calcium carbonate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The automatic mechanical vertical steel kiln is adopted, the limestone with a size of 30-60mm is selected, the content of magnesium oxide is 0.5%, the ratio of coal to stone is 80kg / T limestone, the calcination temperature is controlled between 1000°C and the calcination time is 25h.

[0039] Lime is digested in hot water at 80°C, and the mass ratio of lime to water is 1:6. Add water to the digested rough pulp to adjust the concentration to 12%, first pass through a 100-mesh sieve, and then pass through a hydrocyclone to remove impurities to obtain a fine pulp. The temperature of the fine pulp is controlled at 45°C.

[0040] Pour the fine slurry into a carbonization tower, add phosphoric acid with a relative dry weight of 4% of calcium hydroxide, 0.5% sodium dihydrogen phosphate, and 0.5% sodium hexametaphosphate as crystal form control agents, and stir evenly.

[0041] Ventilate for carbonization, the kiln gas concentration is 30%, and the end point of carbonization ne...

Embodiment 2

[0045] The automatic mechanical vertical steel kiln is adopted, the limestone with a size of 30-60mm is selected, the content of magnesium oxide is 1.5%, the ratio of coal to rock is 80kg / T limestone, the calcination temperature is controlled between 1000°C and the calcination time is 25h.

[0046] Lime is digested in hot water at 80°C, and the mass ratio of lime to water is 1:6. Add water to the digested coarse pulp to adjust the concentration to 12%, first pass through a 100-mesh sieve, and then pass through a hydrocyclone to remove impurities to obtain a fine pulp. The temperature of the fine pulp is controlled at 50°C.

[0047] Pour the refined slurry into a carbonization tower, add phosphoric acid with a relative calcium hydroxide equivalent dry weight of 4.5%, 0.5% sodium dihydrogen phosphate, and 1.0% sodium hexametaphosphate as crystal form control agents, and stir evenly.

[0048] Ventilate for carbonization, the kiln gas concentration is 30%, and the end point of car...

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Abstract

The invention discloses a preparation method of aragonite type crystal seeds and aragonite type light calcium carbonate. The preparation method comprises the following steps: calcining limestones anddigesting the limestones with hot water to prepare coarse slurry; after thickening the coarse slurry, removing impurities to prepare fine slurry; pumping the fine slurry into a carbonizing tower, adding a crystal form control agent to regulate, and uniformly stirring the mixture; introducing kiln gas to carbonize, detecting the pH value and the conductivity online, and judging the carbonizing endpoint; adding a crystal form modifier to regulate; screening the mixture to remove impurities, and carrying out filter press to obtain a filter cake; dispersing the filter cakes to prepare slurry andthen grinding the slurry to obtain aragonite crystal seeds for later use; then pumping the fine slurry into the carbonizing tower again, adding the aragonite type crystal seeds, and uniformly stirringthe mixture; and then introducing kiln gas again to carbonize to obtain the aragonite type crystal seeds. The aragonite type light calcium carbonate prepared by the method has a needle-like crystal shape, and not only can be used as papermaking filler, but also can be used as a paper coating material. The production process is simple, the production cost is relatively low, and industrial production is achieved.

Description

technical field [0001] The invention relates to the technical field of papermaking, in particular to an aragonite-type light calcium carbonate and an aragonite-type light calcium carbonate and a preparation method thereof Background technique [0002] Calcium carbonate is an important chemical raw material in inorganic chemical products. It is widely used in papermaking, plastics, rubber, coatings, inks, daily chemicals, medicine, food processing, sealants, adhesives and other fields. According to the different crystal structures of crystalline calcium carbonate, crystalline calcium carbonate can be divided into calcite type calcium carbonate, aragonite (also known as aragonite) type calcium carbonate, and vaterite type calcium carbonate. Aragonite is unstable and often transforms into calcite. In nature, aragonite is most commonly found in the nacre of shells and pearls. Light calcium carbonate is one of the most commonly used fillers in the paper industry. Due to differe...

Claims

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Application Information

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IPC IPC(8): C01F11/18D21H17/67D21H19/38
CPCC01F11/181C01F11/182C01P2004/10C01P2004/61C01P2004/62D21H17/675D21H19/385
Inventor 施晓旦刘莹傅斌金霞朝
Owner DSSUN NEW MATERIAL SHANDONG
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