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

A low-grade limestone, nano-calcium carbonate technology, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems of high energy consumption, loss of surfactants, etc., to improve production efficiency, high activity, and solve the problem of lime burning. with overburning effect

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

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Embodiment 1

[0028] The limestone is crushed to a size of 30×100mm by the jaw crusher, and then conveyed to the top 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 5 hours, and spray under positive pressure.

[0029] The calcined lime is sieved, and high-quality lime is selected to enter the ash machine for ash. The temperature of the water used for ashing is controlled at 65°C, and the amount used is 7 times 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.

[0030] The prepared fine pulp is kept warm and aged by us...

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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 low-quality calcium oxide is grinded into intermediate-grade calcium oxide products through a high-speed kneader or a ring roll, another part of high-quality calcium oxide enters into the next procedure for producing calcium hydroxide and calcium carbonate, and finally calcium oxide with poor quality is used for producing green building materials - aerated concrete blocks; 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. The method utilizes the low-grade lime to the utmost extent to prepare superfine functional calcium inorganic powder materials.

Description

technical field [0001] The invention relates to a method for preparing inorganic powder, in particular to a method for preparing ultrafine active nano-calcium carbonate by using low-grade limestone and activating with an activation tank. 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 ...

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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