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System device and method for preparing calcium carbonate by using micro-nano bubbles

A technology of micro-nano bubbles and system devices, applied in the field of calcium carbonate, can solve the problems of difficulty in obtaining qualified nano-calcium carbonate products, affecting the carbonization and crystallization process, and low purity of calcium carbonate

Active Publication Date: 2021-06-04
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because calcium carbide slag contains impurities such as coke, ferrosilicon, aluminum-silicon minerals, and non / low-active calcium particles, it may affect the purity of nano-calcium carbonate, and also affect the crystal structure and morphology of nano-calcium carbonate.
[0003] CN100457632C discloses a preparation method of nano-active calcium carbonate, including using calcium carbide slag as raw material, adding water and digesting the calcium oxide obtained by purifying calcium carbide slag to form a calcium hydroxide slurry with a certain concentration, then introducing carbon dioxide, and adding additives at the same time , carry out carbonization reaction, control a series of process parameters during the reaction to prepare nano-calcium carbonate with a certain particle size, but the method does not deal with impurities in carbide slag, which may affect the carbonization and crystallization process
Because the addition amount of crystal form control agent is generally high, resulting in increased preparation costs
In addition, calcium carbide slag contains impurities, and the calcium carbonate prepared by direct carbonization has low purity and poor crystal morphology, and it is difficult to obtain qualified nano-calcium carbonate products.

Method used

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  • System device and method for preparing calcium carbonate by using micro-nano bubbles
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  • System device and method for preparing calcium carbonate by using micro-nano bubbles

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Experimental program
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Embodiment 1

[0109] This embodiment provides a system device for preparing calcium carbonate using micro-nano bubbles, such as figure 1 As shown, the system device includes a connected micro-nano bubble generating device 1 and a reaction device 2; the micro-nano bubble generating device 1 is provided with an air source inlet 3 and a water source inlet 4; there is a stirring device in the reaction device 2, and a There are 12 injection parts 5 evenly distributed on the same level of the body, such as figure 2 As shown, the ratio of the distance between the injection part 5 to the bottom of the reaction device 2 and the height of the reaction device 2 is 1:4, the angle (β) between the center line of the injection port of the injection part 5 and the corresponding diameter of the reaction device 2 is 45°, and the included angle (γ) between any two adjacent injection parts 5 on the same horizontal plane of the shell of the reaction device 2 is 30°, such as image 3 As shown, the outlet of th...

Embodiment 2

[0119] The present embodiment provides a kind of system device that utilizes micro-nano bubbles to prepare calcium carbonate, and described system device comprises the connected micro-nano-bubble generating device and reaction device; Micro-nano-bubble generating device is provided with air source inlet and water source inlet; There is a stirring device in the device, and 6 injection parts are evenly distributed on the same horizontal plane of the shell. The ratio of the distance between the injection part and the bottom of the reaction device to the height of the reaction device is 1:3. The angle between the corresponding diameters of the reaction device is 30°, the angle between any two adjacent injection parts on the same horizontal plane of the reaction device housing is 60°, the outlet of the micro-nano bubble generating device and the reaction device The injection parts are connected;

[0120] The middle part of the reaction device is provided with a first outlet, and th...

Embodiment 3

[0129] The present embodiment provides a kind of system device that utilizes micro-nano bubbles to prepare calcium carbonate, and described system device comprises the connected micro-nano-bubble generating device and reaction device; Micro-nano-bubble generating device is provided with air source inlet and water source inlet; There is a stirring device in the device, and 4 injection parts are evenly distributed on the same horizontal plane of the shell. The ratio of the distance between the injection part and the bottom of the reaction device to the height of the reaction device is 1:5. The angle between the corresponding diameters of the reaction device is 60°, the angle between any two adjacent injection parts on the same horizontal plane of the reaction device housing is 90°, the outlet of the micro-nano bubble generating device and the reaction device The injection parts are connected;

[0130] The middle part of the reaction device is provided with a first outlet, and th...

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Abstract

The invention provides a system device and method for preparing calcium carbonate by using micro-nano bubbles, and the system device comprises a micro-nano bubble generation device and a reaction device which are connected with each other, and also comprises a first separation device and a centrifugal device which are separately connected with the reaction device, and a second separation device and a third separation device which are separately connected with the centrifugal device. The method for preparing calcium carbonate by using the micro-nano bubbles in the system device comprises the following steps: generating the micro-nano bubbles by using the micro-nano bubble generation device, enabling the micro-nano bubbles to enter the reaction device to be mixed with carbide slag for carbonization reaction, and then introducing the reaction system into the centrifugal device for separation, thereby obtaining calcium carbonate particles. According to the method, the grain size of calcium carbonate is controlled by carbonizing the carbide slag through the micro-nano bubbles, a crystal form control agent is not used, continuous operation can be achieved, intermittent operation can also be achieved, and the method and device have the advantages of being large in treatment capacity, high in carbonization speed, low in cost and the like.

Description

technical field [0001] The invention relates to the technical field of calcium carbonate, in particular to a system device and method for preparing calcium carbonate by using micro-nano bubbles. Background technique [0002] Carbide slag is an industrial solid waste formed during the production of acetylene by the calcium carbide method. Its main component is calcium hydroxide and contains impurities such as coke, ferrosilicon and aluminum-silicon minerals. Calcium carbide slag has a high content of calcium and can replace slaked lime for the preparation of nano-calcium carbonate (grain size less than 100nm). However, because calcium carbide slag contains impurities such as coke, ferrosilicon, aluminum-silicon minerals, and non / low-active calcium particles, it may affect the purity of nano-calcium carbonate, and also affect the crystal structure and morphology of nano-calcium carbonate. [0003] CN100457632C discloses a preparation method of nano-active calcium carbonate, i...

Claims

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Application Information

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IPC IPC(8): C01F11/18B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01F11/181C01P2004/64C01P2006/80
Inventor 孟子衡李会泉朱干宇李少鹏颜坤
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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