Process for producing nano calcium carbonate by ultrasonic cavitation technology

A nano-calcium carbonate, ultrasonic technology, applied in the direction of calcium carbonate/strontium/barium, chemical/physical/physical-chemical process of applying energy, etc., can solve problems such as inability to implement, lack of implementation features, etc., to achieve low production cost, convenient computer Automatic control, the effect of shortened preparation time

Inactive Publication Date: 2004-09-01
上海天福机电化工技术研究所有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent ZL99127024.x introduces a "process for producing nano-active calcium carbonate by ultrasonic cavitation technology", but the lack of implementation features in this application makes it impossible for those skilled in the art to implement the invention

Method used

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  • Process for producing nano calcium carbonate by ultrasonic cavitation technology
  • Process for producing nano calcium carbonate by ultrasonic cavitation technology
  • Process for producing nano calcium carbonate by ultrasonic cavitation technology

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0010] Example 1: Limestone is calcined at 1100°C in a vertical kiln to obtain calcium oxide and carbon dioxide gas. The carbon dioxide is sent to a carbon dioxide gas storage tank through an induced draft fan. Weigh 1 ton of calcium oxide and 10 tons of water, and hydrate in the digester. The volume of the digester is 20m 3 , equipped with 1 set of ultrasonic pulverizer, the product model of ultrasonic pulverizer and matching waterproof transmitter is: SC-7000W, the upper end of the transmitter is equipped with a sealed long stainless steel tube, the long tube must be led out of the equipment, and the cable of the transmitter is provided by The inner hole of the tube is connected to the ultrasonic pulverizer. The fixed net frame for installing the transmitter is set to be fixed on the inner wall between the inner wall of the equipment that must be equipped with ultrasonic waves and the stirring shaft in this process, and the upper and lower distances are 1 meter and evenly im...

Embodiment 2

[0011] Embodiment 2: when CaO is hydrated, the ultrasonic power is 6600W, the operating frequency is 17KHZ / second, and 12 sets of transmitters are prepared with a cavitation time of 40 minutes; Ca(OH) 2 When making pulp, the ultrasonic power is 6600W, the working frequency is 17KHZ / s, and 12 sets of transmitters are prepared, and the cavitation time is 30 minutes; during the carbonization reaction, the ultrasonic power is 6600W, the working frequency is 17KHZ / s, and the air mixture contains 35% carbon dioxide , the mixed gas flow rate is 22m 3 / min, the carbonization reaction temperature is 25°C. Prepare 12 sets of emitters for ultrasonic cavitation for 35 minutes, and the drying temperature is 200°C. Others are the same as in Example 1, and the crystal form is observed with a scanning electron microscope. The average particle diameter is 32 nanometers, and the diameter-to-length ratio is 1:10-15.

Embodiment 3

[0012] Embodiment 3: when CaO is hydrated, the ultrasonic power is 6800W, the working frequency is 16KHZ / second, and the cavitation time of 14 sets of transmitters is prepared for 35 minutes; Ca(OH) 2 When making pulp, the ultrasonic power is 6800W, the working frequency is 16KHZ / s, and 14 sets of transmitters are prepared, and the cavitation time is 25 minutes; during the carbonization reaction, the ultrasonic power is 6800W, the working frequency is 16KHZ / s, and the air mixture contains 38% carbon dioxide , the mixed gas flow rate is 33m 3 / min, the carbonization reaction temperature is 22°C. Prepare 14 sets of emitters for ultrasonic cavitation for 25 minutes, and the drying temperature is 240°C. Others are the same as in Example 1, and the crystal form is observed with a scanning electron microscope. The average particle diameter is 28 nanometers, and the diameter-to-length ratio is 1:9-17.

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Abstract

The present invention relates to the production process of calcium carbonate, and especially one ultrasonic cavitation process of producing nano calcium carbonate. The present invention solves the problem of slow mass transferring rate among gas, liquid and solid phases. The production process includes calcining limestone in a vertical kiln to obtain CaO and CO2, hydration of CaO in a digestor to obtain Ca(OH)2, carbonation of Ca(OH)2 emulsion with kiln gas CO2 in a reactor to obtain superfine CaCO3, the CaCO3 slurry is spray dried to obtain superfine calcium arbonate powder, and the ultrasonic cavitation treatment during hydration, preparing slurry and carbonation in separate ultrasonic crusher. Each ultrasonic crusher has power of 6100-7000 w, frequency of 15-19 KHz and 8-16 emitters provided.

Description

technical field [0001] The invention relates to a method for producing nano-calcium carbonate by using sound energy, in particular to a method for producing nano-calcium carbonate by ultrasonic cavitation technology combining ultrasonic cavitation physical effect crushing and chemical reaction engineering. Background technique [0002] At present, the methods for producing superfine calcium carbonate at home and abroad usually adopt carbon dioxide gas to pass into the reactor filled with calcium hydroxide emulsion, and add crystal growth control agent while carbonization reaction to obtain superfine calcium carbonate. See Chinese patent ZL93108625.6, Japanese patent 93228730, Japanese patent 93221634, disclose the production method of this superfine calcium carbonate, because single chemical method is in carbonization reaction, makes the mass transfer rate between gas, liquid, solid phase relatively Slow, easy to produce particle wrapping phenomenon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J19/10C01F11/18
Inventor 李根福贾继红李洪擎谢永胜李峥毅张祖源
Owner 上海天福机电化工技术研究所有限公司
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