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Production process for preparing super fine calcium carbonate from calcite

An ultra-fine calcium carbonate and production process technology, applied in chemical instruments and methods, inorganic pigment treatment, dyeing physical treatment, etc. problem, to achieve the effect of increased fineness

Inactive Publication Date: 2018-09-28
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, the preparation of nano heavy carbonic acid in the prior art is complex and requires high equipment, resulting in high production costs, while the cost of producing ultrafine heavy calcium carbonate is relatively low
[0003] However, the heavy calcium carbonate produced by the existing process has a large particle size distribution range, high water absorption, and non-white color, which is not conducive to improving the tensile, compressive, and wear-resistant properties of the product. Therefore, the product performance of traditional calcium carbonate is improved. It can effectively improve its application performance in industrial fields such as plastics, rubber, coatings and papermaking, so it is particularly important to optimize the production process of ultrafine ground calcium carbonate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A kind of production technique of preparing superfine calcium carbonate with calcite, comprises the following steps:

[0023] (1) After the calcite is cleaned, it is mechanically pulverized, and then placed in a grinder for grinding to obtain a particle size D 90 = 0.3mm calcium carbonate coarse powder;

[0024] (2) Sprinkle water into the calcium carbonate coarse powder so that the water content of the calcium carbonate coarse powder is 9%, cover it with a plastic film, place it for 3 days, then place it in a freezer at -7°C, spread it out, and the calcium carbonate coarse powder The thickness of the powder is 8cm, and it is placed for 10 hours; then placed in a ventilated place, and spread out, the thickness of the calcium carbonate coarse powder is 5cm, dried to a water content of 0.03%, and then sprinkled into the calcium carbonate coarse powder. The water content of calcium coarse powder reaches 1.35%;

[0025] (3) the calcium carbonate coarse powder processed th...

Embodiment 2

[0027] A kind of production technique of preparing superfine calcium carbonate with calcite, comprises the following steps:

[0028] (1) After the calcite is cleaned, it is mechanically pulverized, and then placed in a grinder for grinding to obtain a particle size D 90 = 0.5mm calcium carbonate coarse powder;

[0029] (2) Sprinkle water into the coarse calcium carbonate powder to make the water content of the coarse calcium carbonate powder 8.5%, cover it with a plastic film, place it for 2 days, then place it in a freezer at -7°C, spread it out, and the coarse calcium carbonate powder The thickness of the powder is 10cm, and it is placed for 6 hours; then placed in a ventilated place, and spread out, the thickness of the calcium carbonate coarse powder is 8cm, dried to a water content of 0.01%, and then sprinkled into the calcium carbonate coarse powder. The water content of calcium coarse powder reaches 1.33%;

[0030] (3) the calcium carbonate coarse powder processed thr...

Embodiment 3

[0032] A kind of production technique of preparing superfine calcium carbonate with calcite, comprises the following steps:

[0033] (1) After the calcite is cleaned, it is mechanically pulverized, and then placed in a grinder for grinding to obtain a particle size D 90 = 0.3mm calcium carbonate coarse powder;

[0034] (2) Sprinkle water into the coarse calcium carbonate powder so that the water content of the coarse calcium carbonate powder is 7 to 10%, cover with a plastic film, and place it for 3 days, then place it in a refrigerator at -7°C, spread it out, and carbonic acid The thickness of the calcium carbonate coarse powder is 10cm, put it aside for 80h; then place it in a ventilated place, and spread it out, the thickness of the calcium carbonate coarse powder is 7cm, dry it until the water content is 0.05%, and then sprinkle water into the calcium carbonate coarse powder, Make the water content of calcium carbonate coarse powder reach 1.38%;

[0035] (3) the calcium ...

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Abstract

The invention provides a production process for preparing super fine calcium carbonate from calcite. The process comprises the following steps: (1) cleaning the calcite, performing mechanical crushing, placing the crushed material into a grinding machine, and performing grinding to obtain calcium carbonate crude powder with a particle size D90 of 0.2-0.8 mm; (2) sprinkling water to make a water content of the calcium carbonate crude powder reach 7-10%, performing covering by using a plastic film, placing the calcium carbonate crude powder for 2 to 3 days, then placing the calcium carbonate crude powder into a cold storage with temperature of -7 DEG C to -5 DEG C, spreading the calcium carbonate crude powder, and placing the calcium carbonate crude powder for 6-10 h; and placing the calciumcarbonate crude powder in a ventilated place, spreading the calcium carbonate crude powder, performing air drying until a water content is 0.01-0.05%, and sprinkling water to make the water content of the calcium carbonate crude powder reach 1.2-1.55%; and (3) placing the calcium carbonate crude powder treated in the step (2) into a grinding machine, adding calcium stearate with a mass of 0.1-0.25% of that of the calcium carbonate crude powder, and performing grinding to obtain the super fine calcium carbonate with a particle size D90 of 0.5-0.8 [mu]m. According to the process provided by theinvention, the super fine calcium carbonate having high dispersibility and high whiteness can be prepared by a simple process, and the process has low production costs and is suitable for promotion applications.

Description

technical field [0001] The invention relates to the field of preparation of calcium carbonate materials, in particular to a production process for preparing superfine calcium carbonate from calcite. Background technique [0002] Ground calcium carbonate is widely used in industries such as rubber, plastics, coatings, papermaking, adhesives, and sealants. Nano ground calcium carbonate has small particle size and large specific surface area. Compared with ordinary ground calcium carbonate, it has excellent performance. Nano ground calcium carbonate has a reinforcing effect on rubber and plastics, while ultra-fine ground calcium carbonate has a strong reinforcing effect. However, in the prior art, the preparation process of nano-heavy carbonic acid is complicated, and the requirements for equipment are high, resulting in high production costs, while the cost of producing ultra-fine ground calcium carbonate is relatively low. [0003] However, the heavy calcium carbonate produ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/02C09C3/04
CPCC09C1/021C09C3/04C09C3/041
Inventor 蔡旻谚
Owner 立达超微工业(苏州)有限公司
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