Carbonation reactor of energy-efficient nano calcium carbonate and preparation method of energy-efficient nano calcium carbonate

A nano-calcium carbonate, reactor technology, applied in the direction of calcium carbonate/strontium/barium, nanotechnology, nanotechnology, etc., can solve the problems of high production cost, high energy consumption, restricting the expansion of the application field of nano-calcium carbonate production, etc., Achieve the effect of saving energy consumption and reducing production costs

Active Publication Date: 2014-04-23
WUHU ZHUOYUE NANO NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method consumes a lot of energy during production, and the production cost is high, which restricts the increase of nano-calcium carbonate production and the expansion of application fields.

Method used

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  • Carbonation reactor of energy-efficient nano calcium carbonate and preparation method of energy-efficient nano calcium carbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Such as figure 1 Shown: The diameter of the reactor shell is 1.2 meters, the height is 5.0 meters, the diameter of the inner cylinder is 0.6 meters, and the height is 4.0 meters. The width of the spiral baffle inside the shell is 25 cm, and the length is 20 cm. The inclination angle spirals are arranged and installed at intervals upwards.

[0017] Inject 4.5 cubic meters of calcium hydroxide slurry with a mass concentration of 9.0% into the reactor, add 3.0 kg of crystal form control agent sucrose, the initial temperature of the calcium hydroxide slurry is 25°C, and a Roots blower with a pressure of 78Kpa is used , after compressing the kiln gas, cool it with deep well water to below 25°C, and then enter the umbrella-shaped gas distributor, control the flow rate of the kiln gas to 9 cubic meters per minute, the volume content of carbon dioxide in the kiln gas is 26-30%, carbonization 60 Minutes later, the temperature of the slurry rises to 33°C, and the pH value of th...

Embodiment 2

[0019] With the same equipment and similar method of Example 1, 4.5 cubic meters of calcium hydroxide slurry with a mass concentration of 8.0% were injected into the reactor, 2.5 kilograms of crystal form control agent sucrose were added, and the initial temperature of the calcium hydroxide slurry was When the temperature is 24°C, the kiln gas is compressed and cooled to below 24°C with deep well water, and then enters the umbrella-shaped gas distributor to control the flow rate of the kiln gas to 7 cubic meters per minute, and the volume content of carbon dioxide in the kiln gas is 26-30% After 66 minutes of carbonization, the temperature of the slurry rises to 31°C, and the pH value of the material drops to 6.5-7.0, which is the end of carbonization. The particle diameter of the calcium carbonate slurry synthesized by carbonization in the reactor is 80-130 nanometers measured by the transmission electron microscope, the particle diameter distribution is uniform, the dispersib...

Embodiment 3

[0021] With the same equipment and similar method of Example 1, 4.5 cubic meters of calcium hydroxide slurry with a mass concentration of 7.2% were injected into the reactor, 3.0 kilograms of crystal form control agent sucrose were added, and the initial temperature of the calcium hydroxide slurry was The temperature is 24°C. Compress the kiln gas and cool it to below 23°C with deep well water, then enter the umbrella-shaped gas distributor, control the flow rate of the kiln gas to 7 cubic meters per minute, and the volume content of carbon dioxide in the kiln gas to be 26-30% After 60 minutes of carbonization, the temperature of the slurry rises to 30°C, and the pH value of the material drops to 6.5-7.0, which is the end of carbonization. The calcium carbonate slurry synthesized by carbonization in the reactor has a particle size of 70-100 nanometers measured by a transmission electron microscope, uniform particle size distribution, good dispersibility and no agglomeration phe...

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Abstract

The invention relates to a preparation method of energy-efficient nano calcium carbonate, the main steps are as follows: in carbonization, first a compressed kiln gas is cooled to 25 DEG C by deep well water, during the carbonization process, carbonized slurry is directly cooled by the kiln gas, the cooling effect is increased, the heat produced in the slurry carbonization process can be absorbed directly, and the carbonized slurry temperature is effectively controlled. During the carbonization, the kiln gas enters into an interlayer of an outer barrel and an inner barrel from the periphery of an umbrella-shaped gas distributor to drive the slurry in the interlayer to move from bottom to up, under the action of a porous helical baffle plate, on the one hand, a gas liquid passes through multiple holes of the helical baffle plate to make larger bubbles smaller by division; on the other hand, under the action of the helical baffle plate, the upward gas liquid forms a vortex for enhancement of mixing effects. The upward slurry in the interlayer returns back to the bottom through the inner barrel to form a slurry cyclic carbonation process to facilitate kiln gas absorption and accelerate the carbonation process.

Description

Technical field [0001] The present invention involves a preparation method for energy -saving nanocarbonate. Specifically, it involves a synthesis of nano -carbonate, which controls the temperature of carbonized pulp through the temperature of cooling kiln gas.The gas liquid is mixed, and it is necessary to synthesize the industrialized preparation of nano -carbonate without cooling and mechanical stirring of carbonized plasma. technical background [0002] Calcium carbonate is an important inorganic chemical product. It is one of the most widely used inorganic fillings. It is widely used in chemical fields such as rubber, plastic, paper, coatings, and ink.With the rapid development of the industry, the demand for nano -carbonate in all walks of life has increased.When the existing technology produces calcium carbonate carbonization, in addition to adding crystal control agents, the key is that under low temperature, the carbonization reaction is carbonized through mechanical sti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18B82Y30/00B82Y40/00
Inventor 顾达张和庆朱士洲邓丽丽邵小保史韦陈宁倪春慧茅旭东
Owner WUHU ZHUOYUE NANO NEW MATERIALS
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