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Method for preparing calcium carbonate with actual forms

A technology of calcium carbonate and morphology, 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: 2003-07-16
NANOMATERIALS TECH PTE +1
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  • 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
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Effect test

Embodiment 1

[0047] According to the measurement, take 5kg CaO in the stirred tank, add water with a temperature above 95°C in the quicklime according to the gray-to-water ratio of 1:10 by weight, stir evenly, cool, and then filter the slag with a standard inspection sieve to obtain Ca(OH) 2 Raw material solution, the raw material solution 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 technological process of the present invention (as figure 1 ), the prepared Ca(OH) 2 Suspension 3.51 is added to the stirring tank 10 and sent out through the pump 1, and after the liquid flow meter 3 measures it, it is 0.3m 3 The flow of / h enters the porous packing layer 8 through the distributor 7, and the industrial pure CO 2 After the gas is decompressed and measured by the gas flow meter 11, it is measured by 0.3m 3 The flow rate of / h enters the reactor, in...

Embodiment 2

[0051] Except following change, all the other are the same as embodiment 1.

[0052]The temperature of the carbonization reaction is controlled in the range of about 50-60° C., and the dispersibility of the obtained product is better than that of Example 1, and the morphology is more inclined to the spindle shape. Other product characteristics are with embodiment 1.

Embodiment 3

[0054] Except following change, all the other are the same as embodiment 1.

[0055] The gas flow rate is 0.5m 3 / h, the entire carbonization reaction time is shortened, the particle diameter is 1 μm, the short diameter is 0.3 μm, 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. In particular, the present invention is directed to a process for the preparation of calcium carbonate having various morphologies, also known as crystalline forms. Background technique [0002] Calcium carbonate is an important inorganic chemical product, which is widely used in rubber, plastics, papermaking, coatings, building materials, inks, food, medicine, daily chemicals, textiles, feed and other industries. However, different application fields have different requirements on 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 material in which the calcium carbonate is used, the most used and most common in the paper industry is the calcium carbonate of the spindle or rosette structure, especially the petals Shaped calcium c...

Claims

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Application Information

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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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