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

A low-grade limestone and nano-calcium carbonate technology, applied in the direction of calcium carbonate/strontium/barium, can solve the problems of surfactant loss and energy consumption, and achieve the effect of improving production efficiency and high activity

Inactive Publication Date: 2008-12-10
福建省万旗非金属材料有限公司
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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 consu

Method used

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

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Embodiment 1

[0029] The limestone is crushed by the jaw crusher to a size of 40-80mm, and then conveyed to the distribution hopper of the shaft kiln by the conveyor belt. The shaft kiln is calcined with a dry pulverized coal injection burner. During calcination, control the coal fire calcination temperature of the jet burner to keep at 1050°C, fire at a constant temperature, calcine for 6 hours, and spray under positive pressure.

[0030]The calcined lime is sieved, and high-quality lime is selected to enter the ash machine for ash. The temperature of the ashing water is controlled at 60°C, and the dosage is 6 times of the mass of lime. The primary slurry contains part of the coarse residue, and the solubility of calcium hydroxide is 13-15Be°. The method of hydrocyclone separation and vibrating sieving is used to remove undigested burnt lime, silicon dioxide, magnesium oxide and other impurities to obtain the refined slurry.

[0031] The prepared fine pulp is kept warm and aged by using ...

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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...

Claims

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Application Information

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IPC IPC(8): C01F11/18
Inventor 林积梁谢文清黄文德罗伟肖坤明
Owner 福建省万旗非金属材料有限公司
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