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Indirect process of preparing light calcium carbonate based on medium strengthening

A technology of light calcium carbonate and medium strengthening, which is applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems of complicated production process, unfriendly environment, and limited application, so as to reduce the difficulty of temperature control, wide range of process adaptability, wide range of effects

Inactive Publication Date: 2015-07-08
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are certain defects in using lime as a raw material, which may be mixed with unpredictable high-concentration impurities from calcium carbonate ore resources (such as limestone, dolomite, etc.), which may include aluminum, arsenic, lead, iron, mercury, chromium, nickel, Copper or zinc, thus limiting its application in some industries to some extent
On the other hand, the production of light calcium carbonate requires physical and chemical reaction processes such as raw material calcination, sedimentation, carbonization, and drying. The production process is complicated, the cost is high, and some process links are not environmentally friendly.

Method used

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  • Indirect process of preparing light calcium carbonate based on medium strengthening
  • Indirect process of preparing light calcium carbonate based on medium strengthening

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Mix 100ml of a calcium ion-rich solution with a calcium ion concentration of 2.4g / L, 100ml of tributylamine and 200ml of phase regulator n-butanol, and mechanically stir to make them evenly mixed. Before the reaction, the pH of the solution is stabilized at 10.0. Keep stirring, control the temperature at 27°C, and feed carbon dioxide to react, and the gas flow rate is 30ml / min. The reaction was stopped when the pH dropped to 8.0. The calcium carbonate after the reaction is filtered and dried, and the product is analyzed by a scanning electron microscope to obtain a crystal form of figure 1 The shape of vaterite calcium carbonate.

Embodiment 2

[0026] Mix 100ml of calcium ion-rich solution with a calcium ion concentration of 2.4g / L, 100ml of tributylamine and 200ml of phase regulator n-butanol, and mechanically stir to make them evenly mixed. Keep stirring, control the temperature at 15°C, feed carbon dioxide to react, the gas flow rate is 40ml / min, stop the reaction when the pH drops to 8.0. The calcium carbonate after the reaction is filtered and dried, and the product is analyzed by a scanning electron microscope and a laser particle size analyzer to obtain a crystal form of figure 2 Calcite-type calcium carbonate in shape with an average particle size of 0.79 microns.

Embodiment 3

[0028] Mix 100ml of calcium ion-rich solution with a calcium ion concentration of 5.0g / L, 100ml of tributylamine and 200ml of phase regulator n-butanol, and stir mechanically to make them evenly mixed. Keep stirring, control the temperature at 10°C, feed carbon dioxide to react, the gas flow rate is 40ml / min, the pH drops to 7.5, and stop the reaction. The reacted calcium carbonate is filtered and dried, and the product is analyzed by a laser particle size analyzer to obtain a crystal form of calcite-type calcium carbonate with an average particle size of 0.80 microns.

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Abstract

The invention relates to an indirect process of preparing light calcium carbonate based on medium strengthening. The indirect process comprises the following steps of: adding calcium-rich ion liquor containing inorganic soluble calcium salt into insoluble organic amine as well as a phase regulator, stirring to uniformly mix the liquor until pH of the mixed liquor is kept stable, wherein pH of the mixed liquor is over 9.5; ventilating a CO2 gas or purified industrial smoke gas into the mixed liquor to react with the mixed liquor, controlling a reaction temperature at 5 DEG C-40 DEG C, and stopping the reaction when pH is lowered to 7-8; filtering, drying and grinding the prepared calcium carbonate precipitates to obtain calcium carbonate of different crystalline forms. According to the indirect process disclosed by the invention, the liquor rich in calcium ions and carbon dioxide react under a higher pH environment and an oil-water mixed state which are respectively provided and created by insoluble organic amine and the phase regulator; temperature is controlled, so that preparation of calcite type as well as vaterite type fine light calcium carbonate is realized.

Description

technical field [0001] The invention relates to a new process for preparing light calcium carbonate based on medium strengthening using a calcium ion-rich solution. Background technique [0002] Light calcium carbonate, also known as precipitated calcium carbonate, is prepared by chemical processing. It is a very promising new solid material. Its excellent performance involves applications in many fields such as rubber, plastics, paper, coatings, and food. , Daily chemicals and other industries. The shape of light calcium carbonate can be divided into spindle-shaped, cubic, needle-shaped, chain-shaped, spherical, sheet-shaped and tetragonal column-shaped calcium carbonate according to the shape of calcium carbonate grains. Calcium carbonate can be prepared by controlling the reaction conditions. According to its original average particle size (d), light calcium carbonate is divided into: granular calcium carbonate (5μm), micronized calcium carbonate (1-5μm), fine calcium c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/18
Inventor 王文龙刘鑫王曼王鹏席振乾张延奇
Owner SHANDONG UNIV
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