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Method for regulating and controlling preparation of nano calcium carbonate by using crystal form control agent

A crystal form control agent, nano-calcium carbonate technology, applied in the direction of calcium carbonate/strontium/barium, nanotechnology, chemical instruments and methods, etc., can solve the problem of difficult to obtain ultra-fine nano-calcium carbonate products

Inactive Publication Date: 2020-06-12
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, through the regulation of industry and additives, it is still difficult to obtain ultrafine nano-calcium carbonate products with controllable morphology

Method used

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  • Method for regulating and controlling preparation of nano calcium carbonate by using crystal form control agent
  • Method for regulating and controlling preparation of nano calcium carbonate by using crystal form control agent
  • Method for regulating and controlling preparation of nano calcium carbonate by using crystal form control agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Put the limestone in a muffle furnace for calcination at 1050°C, set the heating rate to 10°C / min, and hold the time for 2 hours to obtain quicklime powder; grind the quicklime powder and pass through a 200-mesh sieve, Add 1:20 to 80°C deionized water and stir for 2 hours to obtain a mass fraction of 17.8% Ca(OH) 2 Emulsion; resulting Ca(OH) 2 Dilute the emulsion with water to obtain Ca(OH) with a mass fraction of 5% 2 Emulsion; for Ca(OH) 2 The emulsion is aged to obtain a suspension of slaked lime, and the aging time is 48 hours; the suspension of slaked lime is added with EDTA-2Na accounting for 5% of the mass of calcium hydroxide, placed in a low-temperature water tank, and the temperature is controlled by ice water to be 3 degrees Celsius. Stir at a speed of 400rpm and feed in CO with a flow rate of 2L / h per gram of calcium hydroxide 2 Gas, real-time monitoring of the pH value of the emulsion, when the pH value is 7, stop feeding CO 2 , and then stirred for 2 h...

Embodiment 2

[0021] The specific process is as in Example 1, the difference is: in the calcination process, the calcination condition is 950 ° C for 4 hours to obtain calcium oxide powder; when the quicklime is digested, the solid-to-liquid molar ratio of the sieved powder and water becomes 1 :5, the stirring time is reduced to 0.5h, and the Ca(OH) that the mass fraction is obtained is 50% 2 Emulsion; dilute with water, after 30 hours of aging to obtain a suspension of slaked lime with a mass fraction of 20%; when slaked lime is carbonized, the crystal form control agent adopts sodium citrate accounting for 2% of the mass of calcium hydroxide, and the stirring speed is 100rpm, CO 2 The flow rate of the gas is controlled at 0.5L / h per gram of calcium hydroxide; when drying, it is dried at 60°C for 2 hours; finally, rod-shaped ultrafine nano-calcium carbonate is obtained.

Embodiment 3

[0023] The specific process is as in Example 1, the difference is that: during the calcination process, the calcination condition is 1050 ° C for 2 hours to obtain calcium oxide powder; when the quicklime is digested, the solid-to-liquid molar ratio of the sieved powder and water becomes 1 :10, the stirring time is reduced to 1.5h, and the Ca(OH) that obtains mass fraction is 31.3% 2 Emulsion; dilute with water, after 24 hours of aging to obtain a suspension of slaked lime with a mass fraction of 10%; when slaked lime is carbonized, the crystal form control agent adopts zinc sulfate accounting for 3% of the mass of calcium hydroxide, and the stirring speed is 200rpm, CO 2 The flow rate of the gas is controlled at 1.5 L / h per gram of calcium hydroxide; when drying, it is dried at 60°C for 2 hours; finally, blocky cubic ultrafine nano-calcium carbonate is obtained.

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Abstract

The invention discloses a method for regulating and controlling preparation of nano calcium carbonate by using a crystal form control agent. By using cheap and accessible limestone as a calcium sourceand low temperature as a carbonization condition, the nucleation rate is controlled by the crystal form control agent by lowering the carbonization temperature of slaked lime to obtain nano calcium carbonate powder with finer particles; the obtained product is nano calcium carbonate powder with different morphologies, the average particle size is 20-100 nm, the crystal form is complete, the particle size is uniform, the dispersity is good, and the high additional value is achieved in the industries of rubber, paint, paint, printing ink and the like.

Description

technical field [0001] The invention relates to a preparation method of ultrafine nano-calcium carbonate, belongs to the field of inorganic materials, and particularly relates to a method for preparing nano-materials by a liquid phase reaction method under low temperature conditions. Background technique [0002] Calcium carbonate is an inorganic powder product. The raw material for industrial production is mainly cheap and easy-to-obtain limestone. It is widely used as an additive and reinforcing agent in rubber, plastics, papermaking, ink, coatings and other fields. The nano-scale calcium carbonate has obvious advantages in reinforcement, transparency, dispersion, thixotropy, etc. due to its special quantum size effect, small size effect and surface effect, thus changing the quality of the product. Practicality and appearance, thereby significantly improving the added value of calcium carbonate products. At present, the specific requirements for high value-added calcium c...

Claims

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Application Information

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IPC IPC(8): C01F11/18B82Y40/00
CPCC01F11/182C01F11/183C01P2004/03C01P2004/16C01P2004/38C01P2004/62C01P2004/64
Inventor 季惠明桑志远
Owner TIANJIN UNIV
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