Method for preparing calcium carbonate crystal whisker with controllable shape

A calcium carbonate whisker and morphology technology, applied in the direction of calcium carbonate/strontium/barium, chemical instruments and methods, single crystal growth, etc., can solve problems such as difficult control of morphology, achieve good product quality, low energy consumption, The effect of cheap and easy-to-obtain reaction raw materials

Inactive Publication Date: 2010-03-31
成都市蜀阳硼业化工有限公司
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Because calcium carbonate whiskers are applied in different fields, the requirements for their size are also different, but using method (4), there is a problem that the morphology is difficult to control in the previous process, so in order to expand the application field of calcium carbonate whiskers, To maximize the performance of composite materials, a preparation method of calcium carbonate whiskers with controllable morphology is required

Method used

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  • Method for preparing calcium carbonate crystal whisker with controllable shape
  • Method for preparing calcium carbonate crystal whisker with controllable shape
  • Method for preparing calcium carbonate crystal whisker with controllable shape

Examples

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Embodiment 1

[0020] Embodiment 1, 1. ingredients: add 8L water to dissolve 6kg bischofite, filter for subsequent use; add a small amount of water to digest 618g quicklime for 15hr, pass through a 60 mesh sieve during use, add all in 100L reactor, add water, make the amount of water added Reached 57kg. ②Process conditions: Prepare the slurry to measure the pH value of the solution, control it at about 9, quickly raise the temperature to 80°C, and react for 30 minutes to form MgCl 2 -CaCl 2 -Mg(OH) 2 reaction system. Adjust the carbon dioxide flow rate to 2.0 L / min, measure the pH value of the solution during the reaction, and when the pH value reaches about 7, the reaction ends. ③ Discharge from the discharge port, use a centrifuge to filter the solid-liquid separation, collect the mother liquor, store it for later use, the solid phase is calcium carbonate whiskers, then wash with water, and wash while centrifuging to obtain a calcium carbonate whisker filter cake. ④The whisker filter c...

Embodiment 2

[0021] Embodiment 2, ① ingredients: 60kg experiment one mother liquor; 690g unslaked lime is digested with a small amount of water for 15hr, passed through a 60-mesh sieve, all added to a 100L reactor, and started to stir. ②Process conditions: Prepare the slurry to measure the pH value of the solution, control it at about 9, quickly raise the temperature to 80°C, and react for 30 minutes to form MgCl 2 -CaCl 2 -Mg(OH) 2 reaction system. Adjust the flow rate of carbon dioxide to 2.5 L / min, and measure the pH value of the solution during the reaction. When the pH value reaches about 7, the reaction ends. ③ Discharge from the discharge port, use a centrifuge to filter the solid-liquid separation, collect the mother liquor, and store it for later use; the solid phase is calcium carbonate whiskers, wash with water, and wash while centrifuging to obtain calcium carbonate whisker filter cakes. ④The whisker filter cake was dried in an oven at 90°C for 6 hours. Obtained calcium ca...

Embodiment 3

[0022] Embodiment 3, 1. Ingredients: 51.5kg of experiment two mother liquor; 775g of quicklime was digested with a small amount of water for 15hr, and passed through a 60-mesh sieve during use; 10kg of water was added; all were added in a 100L reactor, and started stirring. ②Process conditions: Prepare the slurry to measure the pH value of the solution, control it at about 9, quickly raise the temperature to 80°C, and react for 30 minutes to form MgCl 2 -CaCl 2 -Mg(OH) 2 reaction system. Adjust the flow rate of carbon dioxide to 2.5 L / min, and measure the pH value of the solution during the reaction. When the pH value reaches about 7, the reaction ends. ③ Discharge from the discharge port, use a centrifuge to filter the solid-liquid separation, collect the mother liquor, and store it for later use; the solid phase is calcium carbonate whiskers, wash with water, and wash while centrifuging to obtain calcium carbonate whisker filter cakes. ④The whisker filter cake was dried ...

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Abstract

The invention provides a method for preparing a calcium carbonate crystal whisker with controllable shape. In the method, calcined lime is used as a raw material, bischofite is used as a crystal formcontrolling agent, and the calcium carbonate crystal whisker is prepared by the carbonating reaction of carbon dioxide. The method is characterized in that: in the process of preparing the calcium carbonate crystal whisker, the mother solution is recycled, the concentration of magnesium chloride is controlled by adding small amount of bischofite or diluting the mother solution, the concentration of calcium is controlled by adding the staking desanding lime mortar, and the calcium-magnesium ratio of the reaction solution is controlled, so that the shape of the calcium carbonate crystal whiskeris controlled. The method has the advantages of preparing the calcium carbonate crystal whisker with fixed size by controlling the magnesium chloride concentration and calcium magnesium ratio, along with simple, cheap and readily available reaction raw materials, mother solution recycling, high product purity, high yield, easy control and contribution to the realization of mass industrial production.

Description

technical field [0001] The invention belongs to the technical field of inorganic salt materials, and relates to a method for preparing calcium carbonate whiskers with controllable morphology. Background technique [0002] Calcium carbonate is the most abundant mineral resource in the earth's crust. It can be degraded and circulated in nature. It has biological activity and is an important inorganic filler used in large quantities. Calcium carbonate products include heavy calcium and light calcium. As early as 1850, the British Burmese John J&Etrurg Company started to produce calcium carbonate products with calcium chloride and calcium carbonate, and has developed spindle-shaped, cubic, spherical, chain-shaped, chain-shaped, flake-shaped, needle-shaped and other fine calcium carbonate and its modified products. Sexual products, widely used in building materials, rubber, plastics, papermaking, coatings, inks, daily chemicals, feed, food, medicine and other industries. Whisker ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/22C30B29/62C30B7/14C01F11/18
Inventor 乃学瑛叶其祥余德成李武
Owner 成都市蜀阳硼业化工有限公司
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