Preparation method of stable hollow calcium carbonate particles with controllable particle size

Abstract

The invention discloses a preparation method of stable hollow calcium carbonate particles with controllable particle size, which comprises the following steps: respectively preparing a sodium carbonate solution and a calcium chloride solution with the same amount and concentration, adding a magnesium hydroxide and/or barium hydroxide crystal form control agent into the calcium chloride solution, and uniformly stirring; controlling the temperature to be 20-40 DEG C and the stirring rotating speed to be 600-1000rmb/min, adding the sodium carbonate solution into calcium chloride through a peristaltic pump, and continuously stirring for 5-10min after the addition is finished, so as to obtain turbid liquid; and after the reaction is finished, adding ethanol or acetone into the turbid liquid, preserving for 1-3h, filtering, carrying out filter pressing dehydration, drying, crushing and grading to obtain the hollow calcium carbonate particles. The hollow calcium carbonate product produced by the method has high average particle size and stability, the specific surface area can reach 10-25 m < 2 >/g, the preparation process is simplified, the production efficiency is high, the requirements on raw materials are not high, the production cost is low, and industrial production is easy to realize.

Description

technical field [0001] The invention relates to the technical field of inorganic materials, in particular to a method for preparing stable hollow calcium carbonate particles with a controllable particle size. Background technique [0002] Calcium carbonate, as a filler in great demand, can be used in construction, medicine, plastics, rubber, cement and other fields. The unique properties exhibited by products with different shapes and particle sizes continue to expand the application range of calcium carbonate, making it no longer limited to being a composite filler of other materials. Calcium carbonate is a solid particle that is insoluble in water. Hollow calcium carbonate with a cavity is expected to be used as a drug-carrying carrier in the medical field to accurately deliver drugs to the diseased site, or compound with other raw materials to form a lighter density functional materials. It is difficult to solve the stability problem caused by the high specific surface ...

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Problems solved by technology

The advantage of this invention is that the product has a small particle size, a large specific surface area, a rounded spherical shape, and good performance. The raw material used is calcium-containing waste liquid, and the cost is low; the disadvantages are also obvious: the amount of chemical additives used in the whole process is large, and the purity of the product is difficult to guarantee. The patent does not involve the study of the crystal form of calcium carbonate, and its stability needs to be verified

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