Production method of nano calcium carbonate special for organosilicon

A technology of nano calcium carbonate and production method, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems of large investment, immaturity and high production cost, and achieve the effects of low equipment investment, low water content and excellent performance.

Active Publication Date: 2009-10-28
建德市双超钙业有限公司
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AI Technical Summary

Problems solved by technology

However, the domestic nano-calcium carbonate production technology and the development of special application products are not mature enough. The production lines for the production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The production method of this organosilicon special-purpose nano-calcium carbonate of the present invention, step is as follows:

[0017] (1) Lime CaO reacts with water in a digester at a mass ratio of 1:6-7 to generate Ca(OH) 2 Slurry, the slurry passes through a 200-mesh screen and is made into Ca(OH) after passing through a hydrocyclone 2 slurry. The mass percent concentration of raw pulp was recorded at 17%, and it was left to stand for storage.

[0018] (2) Measure Ca(OH) after adding water to the stored raw pulp 2 The mass percent concentration is 6.5%, and the slurry temperature is 32°C, adding crystal form control agents sucrose, barium chloride and citric acid, and the mass percents are 0.1%, 0.4% and 0.4% respectively. Store for 30min.

[0019] (3) Take the placed slurry and put it into the carbonization tower, and pass into the kiln gas for carbonization (kiln gas CO 2 Concentration 31%, temperature 40°C). After 20-30 minutes of reaction, inject cold wa...

specific Embodiment 2

[0022] The dispersant in Example 1 is replaced with sodium hexametaphosphate, the surface treatment agent is replaced with lauric acid, and other conditions are all the same as in Example 1. Take 2000 grams of calcium carbonate sample for testing, (see attached table for results)

[0023] Schedule:

[0024] serial number

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PUM

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Abstract

The invention relates to a production method of nano calcium carbonate special for organosilicon, comprising the following steps: generating Ca(OH)2 slurry by reacting lime CaO and a proper amount of water, producing the refined raw slurry by a hydraulic cyclone after screening the slurry through a screen cloth; adding a proper amount of crystal form control agent into the modulated raw slurry and placing the mixture into a carbonization tower after deposition and pumping kiln gas into the carbonization tower to perform carbonization reaction, and pumping the cold water into the carbonization tower from the bottom of carbonization tower after performing the carbonization reaction for a certain time; placing the boiler slurry into an activation drum and adding the dispersant into the drum and adding saponified surface treating agent into the activation drum after reacting for a certain time; filter pressing, dehydrating, drying and depolymerizing. The depolymerized material is sent to a mixer filled with N2 gas and subjected to secondary activating treatment using the coupling agent and crushed and packaged. The production method has features of low production device investment, nano calcium carbonate of composite crystal type, good affinity and harmony with the organosilicon, increased mechanical strength and durability of the downstream products of the organosilicon.

Description

technical field [0001] The invention relates to a production method of calcium carbonate, in particular to a production method of nano-calcium carbonate special for organosilicon. Background technique [0002] Nano-calcium carbonate is a high-grade calcium carbonate product developed in China in the 1990s. Because its product quality and performance have been significantly improved compared with ordinary calcium carbonate, it can strengthen, toughen and change the processability of products in many application fields. The role of usability is widely used in coatings, rubber, adhesives, inks, cosmetics and other fields. However, the domestic nano-calcium carbonate production technology and the development of special application products are not mature enough. The production lines for the production of high-grade nano-calcium carbonate are mainly imported from abroad. The investment in production equipment is often hundreds of millions, and the production cost is relatively hi...

Claims

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Application Information

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IPC IPC(8): C01F11/18
Inventor 洪宇锋李锐苏兵
Owner 建德市双超钙业有限公司
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