Preparation method of aragonite crystal form calcium carbonate

A technology of calcium carbonate and light calcium carbonate, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems of large amount of MgCl2 and high cost

Inactive Publication Date: 2009-11-04
董承智
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But in this method MgCl 2 The dosage is large, the cost is high, and the requirements for the raw m

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Using commercial or self-made acicular magnesium hydroxide crystals as seeds, 0.5m 3 0.8mol / L MgCl 2 Aqueous solution, at a speed of 5 L / min per minute, under the condition of stirring at 50 rpm, slowly add 3 In the 1mol / L NaOH solution, the temperature is controlled below 50 degrees Celsius. Completely add, continue to stir for 10 minutes, then let it settle for 30 minutes, pass through a 300-mesh sieve, and wash the precipitate twice with deionized water to obtain needle-shaped magnesium hydroxide crystal material. Magnesium hydroxide crystals were observed with a scanning electron microscope, the diameter was 1 μm, and the aspect ratio of the particles was distributed from 3:1 to 6:1.

[0032] The room temperature is 20 degrees Celsius. Add 1 ton of quicklime to the slaking device, add 5 tons of water, stir well after 3 hours, pass through a 60-mesh sieve, and move the filtrate to the carbonization equipment. The 0.1kg magnesium hydroxide crystal prepared is dilu...

Embodiment 2

[0034] Using commercial or self-made acicular magnesium hydroxide crystals as seeds, 0.5m 3 0.8mol / L MgCl 2 Aqueous solution, at a speed of 5 L / min per minute, under the condition of stirring at 50 rpm, slowly add 3 In the 1mol / L NaOH solution, the temperature is controlled below 50 degrees Celsius. Completely add, continue to stir for 10 minutes, then let it settle for 30 minutes, pass through a 300-mesh sieve, and wash the precipitate twice with deionized water to obtain needle-shaped magnesium hydroxide crystal material. Magnesium hydroxide crystals were observed with a scanning electron microscope, the diameter was 1 μm, and the aspect ratio of the particles was distributed from 3:1 to 6:1.

[0035] The room temperature is 1 degree Celsius. Add 1 ton of quicklime to the slaking device, add 3 tons of water, add 1 ton of water after 8 hours, stir well, pass through a 60-mesh sieve, and move the filtrate to the carbonization equipment. The 0.1kg magnesium hydroxide crysta...

Embodiment 3

[0037] Using commercial or self-made acicular magnesium hydroxide crystals as seeds, 0.5m 3 0.8mol / L MgCl 2 Aqueous solution, at a speed of 5 L / min per minute, under the condition of stirring at 50 rpm, slowly add 3 In the 1mol / L NaOH solution, the temperature is controlled below 50 degrees Celsius. Completely add, continue to stir for 10 minutes, then let it settle for 30 minutes, pass through a 300-mesh sieve, and wash the precipitate twice with deionized water to obtain needle-shaped magnesium hydroxide crystal material. Magnesium hydroxide crystals were observed with a scanning electron microscope, the diameter was 1 μm, and the aspect ratio of the particles was distributed from 3:1 to 6:1.

[0038] The room temperature is 20 degrees Celsius. Add 1 ton of quicklime to the slaking device, add 3 tons of water, add 1 ton of water after 3 hours, stir well, pass through a 60-mesh sieve, and move the filtrate to the carbonization equipment. The magnesium hydroxide crystal th...

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Abstract

The invention relates to a preparation method of aragonite crystal form calcium carbonate, comprising the following steps: lime is sent into a digestion equipment and added with water for digestion treatment, water and quick lime are added slowly according to the ratio of 3:1 to 5:1, calcium hydroxide emulsion is obtained by filtrating, the calcium hydroxide emulsion is sent into a carbonization equipment, magnesium hydroxide needle crystal is added as a seed crystal, CO2 is injected in the materials which are mixed at the same time, aragonite crystal form light calcium carbonate is obtained by carbonization reaction; the light calcium carbonate screened pulp is sent into a filtration device for dehydrating and calcium carbonate filter cake is obtained; the sodium polyacrylate is added as a dispersant and light calcium carbonate with particle size distribution of 1-2 mum is obtained after grinding, thus obtaining a dispersion liquid product which reachs 70% of solid content or the liquid product is sent into a drying device for drying to obtain light calcium carbonate dry powder. The preparation method enjoys cheap price, simple preparation process and perfect performance, thus being applicable to the industrialized production. The obtained aragonite crystal form calcium carbonate is suitable to be a papermaking coating.

Description

Technical field [0001] The invention relates to a preparation method of aragonite crystal calcium carbonate. technical background [0002] Calcium carbonate is one of the most abundant mineral resources in the earth's crust and plays an important role in many industrial productions, such as as an inorganic filler. At present, there are two types of calcium carbonate products used in industry: heavy calcium and light calcium. Heavy calcium mainly comes from mineral resources in nature. Light calcium, also known as precipitated calcium carbonate, is mainly produced by carbonate (CO 3- ) and calcium ions (Ca 2+ ) react to produce precipitated light calcium carbonate. Although the molecular composition of calcium carbonate is the same, in the process of forming precipitates, structures of different crystal forms or configurations will be produced. The structures are different, and the physical and chemical properties exhibited are significantly different. [0003] Since the J...

Claims

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Application Information

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IPC IPC(8): C01F11/18
Inventor 董承智
Owner 董承智
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