Method and device for utilizing dynamic magnetic stirring paddle to prepare vaterite

Abstract

The invention discloses a method and a device for utilizing a dynamic magnetic stirring paddle to prepare vaterite. The method comprises the following steps of arraying permanent magnets according to the sequence to prepare the magnetic stirring paddle; placing the magnetic stirring paddle into a reactor; under the condition of stirring, feeding a carbonate solution into a calcium salt solution in the reactor at a constant speed; utilizing a high-intensity magnetic field formed by the permanent magnets on the magnetic stirring paddle for enabling the solution in the reactor to cut magnetic lines; then pumping filtering, washing and drying the reaction solution to obtain the vaterite. The method for preparing the vaterite is a pure physical promotion method, which is simple in process, easy to operate, low in cost, dispensed with any additive, and green and environment-friendly in production process compared with traditional methods requiring adding crystal form control agents and regulating pH. A dynamic rotation magnetic stirring method is adopted, so that the action of the magnetic field is strong, the product purity is high, 100 percent of vaterite type calcium carbonate can be generated, and the method and the device can be largely applied in preparing the vaterite type calcium carbonate.

Description

technical field [0001] The invention relates to the technical field of preparing vaterite, in particular to a method and a device for preparing vaterite by using a dynamic magnetic stirring paddle. Background technique [0002] As a biological ore, calcium carbonate has been an important raw material for industrial production because of its diverse functions and low cost. Calcium carbonate powder is widely used in pharmaceuticals, detergents, biomedicine, rubber, plastics, paper, toothpaste, cosmetics, coatings and food industries, as whitening agents, adsorbents, additives and biomedical materials. The above uses are determined by the characteristic properties of the prepared calcium carbonate material, such as average particle size, particle size distribution, specific surface area, morphology or chemical purity. The physical and chemical properties of precipitated calcium carbonate are highly affected by the synthesis steps, methods and synthesis conditions. Therefore, b...

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Problems solved by technology

[0006] For the preparation method of adding a crystal form control agent and adjusting pH, the final product needs to remove the control agent to purify the product. Not only the process is cumbersome, but also the production cost is increased. The stability and reliability of the crystal form control agent have a great impact on product quality.

However, the method of regulating temperature has complicated operation process and is limited by the energy consumption of temperature control, which not only affects the economy, but also cannot obtain 100% pure vaterite in many cases.

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