Production process of ultrafine calcium carbonate powder

A technology of ultra-fine calcium carbonate and production process, applied in the direction of calcium carbonate/strontium/barium, calcium/strontium/barium compounds, nanotechnology for materials and surface science, etc., can solve the unfavorable use of calcium carbonate, ultra-fine carbonic acid Calcium crystal structure is difficult to control and other problems, to achieve the effect of reducing the size of secondary particles, improving dispersion and enhancing compatibility

Inactive Publication Date: 2020-06-26
立达超微工业(苏州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this processing technology only crushes calcite, and it is difficult to control the crystal structure of ultrafine calcium carbonate made of heavy calcium carbonate, which is not conducive to the subsequent use of calcium carbonate in various fields.

Method used

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  • Production process of ultrafine calcium carbonate powder
  • Production process of ultrafine calcium carbonate powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A production process of ultrafine calcium carbonate powder, comprising the following steps:

[0037] a. Put water and quicklime with a mass ratio of 7:1 in Reactor A for digestion reaction. The temperature of the water added is 80°C to obtain calcium hydroxide coarse slurry, age for 24 hours, and sieve through 300 mesh to obtain refined pulp material;

[0038] b. Add water to the refined slurry to make 1mol / L calcium hydroxide slurry;

[0039] c. Add 10L of the calcium hydroxide slurry obtained in step b to the three-port reactor B, add 90mol of divinyltriamine, and start the reaction at a temperature of 20°C and a stirring speed of 500r / min. The gas that is fed is a mixed gas of carbon dioxide and nitrogen with a volume ratio of 1:2, and the flow rate of the mixed gas is 1.2m 3 / h; carry out carbonization reaction;

[0040] d. When the pH value drops to 6.5, continue to ventilate and carbonize for 10 minutes to obtain calcium carbonate slurry;

[0041] e. Add a bor...

Embodiment 2

[0045] A production process of ultrafine calcium carbonate powder, comprising the following steps:

[0046] a. Put water and quicklime with a mass ratio of 8:1 in Reactor A for digestion reaction. The temperature of the added water is 100°C to obtain calcium hydroxide coarse pulp, age for 36 hours, and sieve through 400 mesh to obtain refined pulp material;

[0047] b. Add water to the refined slurry to make 1.5mol / L calcium hydroxide slurry;

[0048]c. Add 10L of the calcium hydroxide slurry obtained in step b to the three-port reactor B, add 100mol of divinyltriamine, and start the reaction at a temperature of 25°C and a stirring speed of 600r / min. The gas that is fed is a mixed gas with a volume ratio of carbon dioxide and nitrogen of 1:2.5, and the flow rate of the mixed gas is 1.5m 3 / h; carry out carbonization reaction;

[0049] d, when the pH value drops to 7, continue to ventilate and carbonize for 15 minutes to obtain calcium carbonate slurry;

[0050] e. Add a bo...

Embodiment 3

[0054] A production process of ultrafine calcium carbonate powder, comprising the following steps:

[0055] a. Put water and quicklime with a mass ratio of 7:1 in Reactor A for digestion reaction. The temperature of the added water is 100°C to obtain calcium hydroxide coarse pulp, age for 24 hours, and sieve through 300 mesh to obtain refined pulp material;

[0056] b. Add water to the refined slurry to make 1mol / L calcium hydroxide slurry;

[0057] c. Add 10L of the calcium hydroxide slurry obtained in step b to the three-port reactor B, add 100mol of divinyltriamine, and start the reaction at a temperature of 25°C and a stirring speed of 500r / min. The gas that is fed is a mixed gas of carbon dioxide and nitrogen with a volume ratio of 1:2, and the flow rate of the mixed gas is 1.5m 3 / h; carry out carbonization reaction;

[0058] d. When the pH value drops to 6.5, continue to ventilate and carbonize for 10 minutes to obtain calcium carbonate slurry;

[0059] e. Add a bor...

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Abstract

The invention provides a production process of ultrafine calcium carbonate powder, and relates to the technical field of calcium carbonate powder. The production process of the ultrafine calcium carbonate powder comprises the following steps: firstly, carrying out a digestion reaction on water and quick lime according to a mass ratio of (7-8):1, ageing for 24-36 h, and sieving to obtain a refinedslurry; adding water into the refined slurry to prepare a calcium hydroxide slurry with the concentration of 1-1.5 mol/L; adding a crystal form control agent into 10 L of the calcium hydroxide slurry,introducing gas, and carrying out a carbonization reaction; finally, performing a reaction for 2-2.5 h at 70-80 DEG C; and centrifuging, drying and crushing the slurry obtained by the reaction to obtain the ultrafine calcium carbonate powder. The ultrafine sodium carbonate prepared by reasonable blending has small size, good solubility, good controllability and good dispersity, can be controlledto be prepared into calcium carbonate with different crystal forms and morphologies, and has different use effects.

Description

technical field [0001] The invention relates to the technical field of ultrafine calcium carbonate powder, in particular to a production process of ultrafine calcium carbonate powder. Background technique [0002] Calcium carbonate is an important inorganic chemical product. It is also the inorganic filler with the largest amount and the widest application range. Due to the common raw materials, low price, non-toxic and tasteless, it is widely used in the production of rubber, building materials, plastics, coatings, papermaking, feed, paint, medicine, food and ink, etc., to save masterbatch, increase capacity and reinforce and The effect of reducing costs. In recent years, the application value of ultra-fine calcium carbonate products has been improved due to the ultra-fine particle size of calcium carbonate products, the diversity of crystal shapes and the development of surface modification. Ultrafine calcium carbonate is a new type of nano-solid material with wide appl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18B82Y30/00
CPCC01F11/183B82Y30/00C01P2004/64
Inventor 蔡旻谚
Owner 立达超微工业(苏州)有限公司
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