Method for preparing nanometer CaCO3 from calcium carbide slag through ultrasonic process

A technology of nano-calcium carbonate and nano-scale calcium carbonate, applied in the direction of calcium carbonate/strontium/barium, nanotechnology, etc., can solve the problems of difficult control of particle size distribution range, long carbonization reaction time, weak functionality, etc., and achieve the preparation time Shortening shortening, high product added value, and good product stability

Inactive Publication Date: 2012-06-27
XINJIANG TIANSHAN CEMENT CO LTD
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Problems solved by technology

[0006] In short, the prior art uses limestone or calcium carbide slag to prepare nano-calcium carbonate. The process is complicated, the particle size distribution range is wide and difficult to control, the carbonization reaction time is long, difficult to control, and the cost is high. The products produced by nano-calcium carbonate manufacturers are single. Not very functional

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  • Method for preparing nanometer CaCO3 from calcium carbide slag through ultrasonic process
  • Method for preparing nanometer CaCO3 from calcium carbide slag through ultrasonic process

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Embodiment Construction

[0011] Carbide slag is purified to generate Ca(OH) 2 emulsion, then add dispersant, CO 2 And air Air, after ultrasonic irradiation, and then stir evenly, after suction filtration and drying to generate nano CaCO 3 .

[0012] The present invention will be further described below in combination with specific embodiments.

[0013] Wash the industrial waste calcium carbide slag several times with clean water until the sewage becomes clear, pass through a coarse sieve to remove some mechanical impurities, dry at 105°C for 24 hours, cool, crush, and grind the calcium carbide slag to a particle size of 106-250 μm. Calcined at 900°C for 3 hours, cooled to obtain purified carbide slag, weighed a certain amount of purified carbide slag with an electronic analytical balance, and heated the oil bath to 80°C in parts by weight of carbide slag:distilled water=1:10 Keep the temperature constant, put it into a 1000mL beaker filled with distilled water, and then put it into a magnet. After ...

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Abstract

The invention relates to a method for preparing nanometer CaCO3 from calcium carbide slag through an ultrasonic process. The calcium carbide slag is purified to generate a Ca(OH)2 emulsion, the Ca(OH)2 emulsion which is added with a dispersant, CO2 and air is irradiated by ultrasonic waves, uniformly stirred, suck-filtered and dried to generate the nanometer CaCO3. The method for preparing the nanometer CaCO3 through adopting the ultrasonic process has the advantages of simple operation, no need of designing a new device, high product added value, gas-liquid-solid mass transfer speed improvement benefiting, realization of the resource comprehensive utilization of the industrial waste slag calcium carbide slag, limestone resource consumption reduction, production cost reduction, natural environment improvement, novel technology, operation benefiting, good product stability, substantial shortening of the preparation time, environment improvement, particle size of 30-200nm, and purity of above 99.2%. Production requirements of the rubber industry, the plastic industry and the coating industry are completely met.

Description

technical field [0001] The invention relates to the technical field of calcium metal compounds of international patent classification C01F, in particular to a method for preparing nano-calcium carbonate with calcium carbide slag by an ultrasonic method. Background technique [0002] Most of the production of nano-calcium carbonate in the known technology is based on limestone as the main raw material, which consumes a large amount of limestone resources and has high production costs. The existing technology is that the carbonization method is to calcinate the preferred limestone at high temperature to obtain calcium oxide and carbon dioxide, and then react the calcium oxide with water to generate a refined calcium hydroxide suspension; then pass it into CO 2 Gas, using certain tracking and monitoring means, after the reaction is terminated, aging for a period of time, suction filtration, drying, crushing, to obtain calcium carbonate products. The particle size and crystal f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18B82Y40/00
Inventor 马空军包文忠赵文新靳冬民
Owner XINJIANG TIANSHAN CEMENT CO LTD
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