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Method for preparing calcium carbonate with actual forms

A calcium carbonate and morphology technology, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems of slow mass transfer rate, wide particle size distribution, poor micro mixing, etc., to shorten the reaction time, reduce production costs, and narrow particle size distribution. Effect

Inactive Publication Date: 2010-12-08
NANOMATERIALS TECH PTE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The above-mentioned conventional method for preparing calcium carbonate reacts in stirred tank or bubble tower usually, because the mass transfer rate between gas-liquid-solid phase is slower when reacting in above-mentioned container, microcosmic mixing is poor, so the reaction time is longer, And the calcium carbonate product that makes by this carbonization method usually also has the following problems: (1) the morphology of the obtained calcium carbonate is not single enough; (2) the particle size distribution is not uniform enough, and the particle size distribution is wide; (3) the particle quality is not up to To the requirements of the downstream product industry; (4) Long response time
But, do not mention in these documents and can use the carbonization method described in the present invention, under the hypergravity reaction condition, obtain calcium carbonate, particularly have the content of relevant aspect aspect described in the present invention

Method used

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  • Method for preparing calcium carbonate with actual forms
  • Method for preparing calcium carbonate with actual forms
  • Method for preparing calcium carbonate with actual forms

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] According to the measurement, weigh 5kg CaO in a stirred tank, add water with a temperature of 95℃ or higher to the quicklime at a weight ratio of 1:10 to the ash-water ratio, stir evenly, cool, and filter with a standard inspection sieve to remove the residue to obtain Ca(OH) 2 Raw material liquid, the raw material liquid is roughly mixed with water to contain Ca 2+ 0.8mol / L Ca(OH) 2 Suspension. Determination of Ca(OH) by EDTA complexometric titration 2 Ca in suspension 2+ The exact concentration. Adopt the technological process of the present invention (such as figure 1 ), the Ca(OH) 2 Suspension 3.51 is added to the stirred tank 10 and sent out by the pump 1 and measured by the liquid flow meter 3. 3 / h flow through the distributor 7, into the porous packing layer 8, while the industrial pure CO 2 After the gas is decompressed and measured by the gas flowmeter 11, the 3 / h flow into the reactor, in the porous filler layer 8 and the above containing Ca 2+ Ca(OH) with a ...

Embodiment 2

[0051] Except for the following changes, the rest is the same as in Example 1.

[0052] The carbonization reaction temperature is controlled within the range of about 50-60°C for the reaction, and the dispersibility of the obtained product is better than that of Example 1, and the morphology is more spindle-shaped. Other product features are the same as in Example 1.

Embodiment 3

[0054] Except for the following changes, the rest is the same as in Example 1.

[0055] The gas flow rate is 0.5m 3 / h, the entire carbonization reaction time is shortened, the particle diameter is 1μm in the long axis and 0.3μm in the short axis, and the morphology is still spindle-shaped.

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Abstract

A process for preparing calcium carbonate with actual forms (such as spindle, petal, needle, flake, ball fibre, etc.) features that in the supergravity field condition of rotating bed and under the existance of crystal form controlling agent and crystal seeds, the suspension of calcium hydroxide and CO2-contained raw gas take part in carbonifying reaction. Its advantage is controllable granularity and form.

Description

Technical field [0001] The invention relates to a method for preparing (precipitated) calcium carbonate. Specifically, the present invention relates to a method for preparing calcium carbonate having various morphologies (also referred to as crystal forms). Background technique [0002] Calcium carbonate is an important inorganic chemical product, which is widely used in rubber, plastics, papermaking, coatings, building materials, ink, food, medicine, daily chemical, textile, feed and other industries. However, different application fields have different requirements for the physical and chemical properties of calcium carbonate particles. For example, CaCO 3 The morphology of the particles has a great influence on the properties of the substance in which the calcium carbonate is used. The most commonly used and most commonly used in the paper industry is spindle or rosette structure calcium carbonate, especially petals. Shaped calcium carbonate, it can reduce the agglomeration ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/18
Inventor 陈建峰沈志刚初广文王玉红
Owner NANOMATERIALS TECH PTE
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