Preparation method of pine-cone-shaped calcite type micron-size calcium carbonate particles

A calcite-type, micron-level technology, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems such as the report of micron-level calcium carbonate with no pine cone shape, achieve good social and ecological benefits, reduce dosage, and reduce emissions and processing effects

Inactive Publication Date: 2016-01-27
GUANGXI UNIV FOR NATITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] At present, there are no reports of micron-scale calcium carbonate with pine cone morphology

Method used

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  • Preparation method of pine-cone-shaped calcite type micron-size calcium carbonate particles
  • Preparation method of pine-cone-shaped calcite type micron-size calcium carbonate particles
  • Preparation method of pine-cone-shaped calcite type micron-size calcium carbonate particles

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1. Raw material composition and mass quantity:

[0034] 60 parts of calcium oxide, 2 parts of compound crystal growth control agent, 900 parts of water, appropriate amount of carbon dioxide.

[0035] The mass ratio of the components of the above crystal growth composite control agent is: sodium p-styrene sulfonate: sodium methylene bis-naphthalene sulfonate: alkyl naphthalene sulfonate = 0.2: 0.3: 0.5 mixture.

[0036] 2. Preparation method:

[0037]Dissolve 60 parts of calcium oxide in 900 parts of water, undergo hydration reaction, let stand for 24 hours and then filter to prepare Ca(OH) 2 Put the suspension into the carbonization reactor, then add the aqueous solution of the crystal growth composite control agent, and stir at 50°C and 500r / min, and set the flow rate to 90m 3 / (h·m 3 Suspension) of CO 2 The gas distributor that passes into the bottom of the carbonization reactor reacts with calcium hydroxide, and when the reaction slurry pH=8.5, the CO2 flow rate ...

Embodiment 2

[0039] 1. Raw material composition and mass quantity:

[0040] 60 parts of calcium oxide, 4.5 parts of compound crystal growth control agent, 1500 parts of water, appropriate amount of carbon dioxide.

[0041] The crystal growth composite control agent mentioned above is a mixture of sodium p-styrene sulfonate: sodium methylene bis-naphthalene sulfonate: alkylnaphthalene sulfonate=0.2:0.1:0.7.

[0042] 2. Preparation method:

[0043] Dissolve 60 parts of calcium oxide in 1500 parts of water, undergo hydration reaction, let stand for 18 hours and filter to prepare Ca(OH) 2 Put the suspension into the carbonization reactor, then add the aqueous solution of the crystal growth composite control agent, under the stirring action of 95°C and 600r / min, the flow rate is 120m 3 / (h·m 3 Suspension) of CO 2 Pass into the gas distributor at the bottom of the carbonization reactor to react with calcium hydroxide, when the pH of the reaction slurry=9, the CO 2 Velocity reduced to 80m 3...

Embodiment 3

[0045] 1. Raw material composition and mass quantity:

[0046] 60 parts of calcium oxide, 3.5 parts of compound crystal growth control agent, 1200 parts of water, appropriate amount of carbon dioxide.

[0047] The compound crystal growth control agent described above is a mixture of sodium p-styrene sulfonate: sodium methylene bis-naphthalene sulfonate: alkylnaphthalene sulfonate=0.3:0.1:0.6.

[0048] 2. Preparation method:

[0049] Dissolve 60 parts of calcium oxide in 1200 parts of water, undergo hydration reaction, let stand for 20 hours and then filter to prepare Ca(OH) 2 Put the suspension into the carbonization reactor, then add the aqueous solution of the crystal growth composite control agent, under the stirring action of 80°C and 550r / min, the flow rate is 110m 3 / (h·m 3 Suspension) of CO 2 Pass into the gas distributor at the bottom of the carbonization reactor to react with calcium hydroxide, and when the pH of the reaction slurry=8.3, the CO 2 Velocity reduced...

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Abstract

The invention discloses a preparation method of pine-cone-shaped calcite type micron-size calcium carbonate particles. 60 parts by mass of calcium oxide is dissolved in water, a 5wt%-15wt% Ca(OH)2 suspension liquid is prepared through a conventional hydration reaction, a crystal growth compound control agent is added, CO2 is introduced to a carburizing reaction kettle at the temperature of 25 DEG C-95 DEG C, a first-level carburizing reaction is performed, a second-level carburizing reaction is performed when pH (potential of hydrogen) of a reaction liquid ranges from 8 to 9, introduction of CO2 is stopped when the pH is equal to 7-7.5, a carburizing reaction proceeds for 20 min, then conventional filtering, washing and hot-air drying are performed, and the pine-cone-shaped calcite type micron-size calcium carbonate particles are obtained. A pine-cone-shaped calcium carbonate product is obtained by changing a crystal growth control agent and performing the second-level carburizing reaction, the product has a low oil absorption value, the surface area is larger, the application effect of calcium carbonate is improved, reaction conditions are simple, the operation is easy, the product cost is low, and economic benefits, social benefits and ecological benefits are good.

Description

technical field [0001] The invention belongs to the technical field of inorganic powder preparation, and relates to a method for preparing calcium carbonate, in particular to a method for preparing calcite-type micron-sized calcium carbonate particles with a pine cone shape. Background technique [0002] Calcium carbonate is widely used in rubber, paper, paint, medicine, cosmetics and other industries and departments, whether it is ordinary grade or nanometer and ultrafine calcium carbonate. Although different industries have different requirements on the morphology, particle size and surface properties of calcium carbonate, the synthesis of calcium carbonate materials with controllable morphology and structure is one of the hotspots of current research. With the help of various additives, the method of solution synthesis can be used Calcium carbonate with controllable shape, size and structure was prepared. [0003] The preparation of calcium carbonate with different shape...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18
Inventor 袁爱群黄增尉韦冬萍朱勇周泽广马少妹
Owner GUANGXI UNIV FOR NATITIES
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