Method for preparing ultra-fine active nano-calcium carbonate with low-ore grade limestone wet-process activation

Abstract

The invention provides a method for preparing superfine activated nano calcium carbonate by utilization of low-grade lime. The method adopts the technical proposal that: firstly, the low-grade lime is calcined and crushed so as to prepare calcium oxide; secondly, staged sieving is performed, namely a part of high-quality calcium oxide enters into the next procedure for producing calcium hydroxide and calcium carbonate; and thirdly, the superfine activated nano calcium carbonate product is prepared after incineration through an incinerator, heat-insulated aging, bubbling carbonization, secondary aging, wet-way secondary activation, recarbonization, centrifugal dewatering, drying and superfine crushing of the high-quality calcium oxide. When the product is applied to plastics and rubber, the cost can be reduced and simultaneously the hardness, the toughness, the strength, the bending resistance and the abrasion resistance of polymer products can be improved; and when the product is applied to coating, performance parameters such as the insubmersibility, the storage stability, the thixotropy and so on can be effectively improved.

Description

technical field [0001] The invention relates to a method for preparing inorganic powder, in particular to a method for preparing superfine active nano-calcium carbonate by wet activation using low-grade limestone. technical background [0002] Since the emergence of nanotechnology in the 1980s, its basic theoretical research and application research in the development of new materials have developed rapidly, and have been widely used in traditional materials, medical equipment, electronic equipment, coatings, plastics and other industries . Nanotechnology has become a hot issue in the field of materials science in the 21st century. The development and research of new nanomaterials has been included in the development strategy of science and technology by many countries and regions. The total investment in new nanomaterials research in the world is increasing year by year. In recent years, my country's nanotechnology has developed rapidly. The use of nanotechnology for nanoc...

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Problems solved by technology

[0009] Fatty acid activation is divided into two methods: saponification activation and non-saponification activation. The general production enterprises use fully saponified fatty acid salts for activation, which consumes more energy during the preparation of active agents, and because the fatty acid salts after saponification have a certain Solubility, easy to cause part of the loss of surfactant loss during the filter press process

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