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Method for generating acicular calcium carbonate particles

A technology of needle-shaped calcium carbonate and calcium carbonate, which is applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems of slowing down the reaction speed, environmental pollution, uncontrollable calcium carbonate crystal form, etc., without changing the system temperature and reducing energy consumption Effect

Active Publication Date: 2022-01-28
IND TECH RES INST +1
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

The prior art uses different methods to control the crystal form of calcium carbonate, for example, increasing the reaction temperature for producing calcium carbonate, adding additives in the reaction solution, using non-aqueous solvents such as methanol or using the inverse microemulsion method of surfactants, and high gravity carbonization method, etc.; however, these methods have some disadvantages, for example, heating will increase the manufacturing cost of calcium carbonate; the residue of additives will affect the purity and mechanical properties of calcium carbonate products; the use of non-aqueous solvents and surfactants Can improve the manufacture cost of calcium carbonate, reduce reaction speed, and cause environmental pollution etc.; rice calcium carbonate

Method used

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  • Method for generating acicular calcium carbonate particles
  • Method for generating acicular calcium carbonate particles
  • Method for generating acicular calcium carbonate particles

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preparation example Construction

[0030] The calcium source aqueous solution used in the method for preparing acicular calcium carbonate particles disclosed in the present disclosure is not particularly limited, and water-soluble calcium salts or colloidal calcium hydroxide may be used. In a specific embodiment, the calcium source aqueous solution is calcium chloride aqueous solution. Other sources of calcium include calcium hydroxide. Likewise, carbonates that may be used include sodium carbonate and potassium carbonate.

[0031] In the method for preparing needle-shaped calcium carbonate particles disclosed in the present disclosure, the concentration of the calcium source aqueous solution and the carbonate aqueous solution is controlled, usually, the concentration of the calcium source aqueous solution and the carbonate aqueous solution is not higher than 0.05 mol / liter, In order to allow the calcium source and the carbonate solution to have suitable space and time for nucleation after contact, and to avoi...

Embodiment 1

[0043] Embodiment 1: prepare calcium carbonate particle with two-stage magnetization treatment

[0044] This embodiment prepares acicular calcium carbonate at a temperature of 32°C. First, prepare 0.009 mol / liter calcium chloride aqueous solution and 0.009 mol / liter sodium carbonate aqueous solution respectively, then, make the calcium chloride aqueous solution and sodium carbonate aqueous solution pass through 10 pairs of magnets, the length of which is 30 cm in total, and the resulting strength is between 7000 To 9100, the average is the magnetic field of 8145 gauss, wherein, the magnetic force direction of adjacent two pairs of magnets is opposite, and the flow velocity of setting calcium chloride aqueous solution and sodium carbonate aqueous solution through this magnetic field is 30 centimeters / second, makes calcium chloride aqueous solution and sodium carbonate aqueous solution are respectively circulated and subjected to magnetization for 4 hours to form magnetized calc...

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Abstract

A method for producing acicular calcium carbonate particles, comprising separately subjecting the calcium source aqueous solution and the carbonate aqueous solution to circulation through a magnetic field for the first time to obtain the magnetized calcium source aqueous solution and the magnetized carbonate aqueous solution; mixing the magnetized calcium source aqueous solution and magnetizing the aqueous carbonate solution to produce a calcium carbonate slurry, subjecting the calcium carbonate slurry to a magnetic field cycle for a second time; and separating liquid and calcium carbonate particles from the cycled calcium carbonate slurry.

Description

technical field [0001] The present disclosure relates to a method for producing acicular calcium carbonate particles, in particular to a method for controlling the formation of acicular calcium carbonate particles by using a magnetic field. Background technique [0002] Calcium carbonate with different crystal forms has different uses and is applied in different industries. For example, the rose petal-like calcium carbonate can be used in the paper industry, rubber, plastics and coating industries, among which, in the paper industry, it can provide whiteness, brightness, opacity, bulkiness and ink absorption, etc. ;In the rubber, plastic and coating industries, it has the purpose of improving the porosity of the coating, oil absorption and hydrophilicity, water retention and comprehensive physical and mechanical properties; prismatic calcium carbonate can be used in the paper industry, and has the ability to provide opacity, strength and Volume and other purposes; Acicular ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/18
Inventor 张名惠柳万霞陈瑞燕徐恒文
Owner IND TECH RES INST
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