Device for preparing precipitated calcium carbonate by adopting supercritical carbon dioxide

A technology for precipitating calcium carbonate and carbon dioxide, applied in calcium carbonate/strontium/barium, nanotechnology for materials and surface science, inorganic chemistry, etc., can solve problems such as batch quality variance, unsatisfactory dispersion and stability , to achieve the effects of small particle size range, convenient maintenance and daily maintenance, and simple structure

Active Publication Date: 2021-12-17
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The production of PCC by the above carbonization process is not ideal in terms of dispersibility and stability. The reason is related to the gap between the carbonization process, the utilization rate of CO2 and the control operation of equipment technology, especially the quality between batches. The difference is particularly obvious

Method used

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  • Device for preparing precipitated calcium carbonate by adopting supercritical carbon dioxide
  • Device for preparing precipitated calcium carbonate by adopting supercritical carbon dioxide
  • Device for preparing precipitated calcium carbonate by adopting supercritical carbon dioxide

Examples

Experimental program
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Embodiment 1

[0043] Such as figure 1 As shown, the present embodiment is the use of supercritical CO described in the present invention 2 An example of a multi-phase volute continuous carbonization device for PCC, the components include a fine slurry inlet 1, a supercritical CO 2 Input nozzle 2, carbonization reactor 3, forward and reverse paddle turbine combination 4, crystal form control agent inlet 5, Laval nozzle 6, central shaft 7, maintenance manhole 8. The specific position and connection relationship of the components are as follows:

[0044] The supercritical CO 2The input nozzle 2 is arranged on the fine pulp inlet 1, and the fine pulp inlet 1 is connected to the inlet of the carbonization reactor 3, and the fine pulp inlet 1 is a horn pipe that gradually shrinks, and the feed port of the carbonization reactor 3 is connected to the inlet of the fine pulp inlet. Small opening, the discharge port of the carbonization reactor is connected to the Laval nozzle. The carbonization re...

Embodiment 2

[0049] Present embodiment is the example of the method for preparing PCC by the device that adopts supercritical carbon dioxide to prepare precipitated calcium carbonate, comprises the following steps:

[0050] (1) The saturated calcium hydroxide slurry is fed in under pressure from the fine pulp inlet, so that the flow rate of the saturated calcium hydroxide slurry is Mach 1.

[0051] (2) From supercritical CO 2 The input nozzle feeds supercritical CO 2 ; and accelerate to Mach 1.5.

[0052] (3) Combine saturated calcium hydroxide slurry and supercritical CO 2 Accelerate the pressure into the carbonization reactor through the gradually reduced variable diameter pipe;

[0053] (4) The saturated calcium hydroxide slurry and the supercritical CO 2 Stir while adding the crystal form control agent through the crystal form control agent inlet;

[0054] (5) The calcium carbonate slurry generated by the reaction is discharged from the Wahl spout, and the discharge is precipitate...

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Abstract

The invention discloses a device for preparing precipitated calcium carbonate by adopting supercritical carbon dioxide. The device comprises a purified slurry plasma inlet, a supercritical CO2 input spray pipe, a carbonization reactor, a positive and negative paddle turbine combination, a crystal form control agent inlet, a Laval nozzle and a central shaft, the supercritical CO2 input spray pipe is arranged on the purified slurry plasma inlet, the seminal plasma inlet is arranged at the inlet of the carbonization reactor, the purified slurry plasma inlet is a gradually reduced horn tube, the inlet of the carbonization reactor is a small horn opening, and the outlet of the carbonization reactor is connected with the Laval nozzle. The carbonization reactor is a sealed tank body which is gradually enlarged and then gradually reduced from a feed port to a discharge end, the crystal form control agent inlet is formed in the upper part of the front end of the carbonization reactor, and the positive and negative paddle turbine combination is arranged in the carbonization reactor and is mounted on the central shaft. The device disclosed by the invention is controllable in carbonization process, length-diameter ratio and crystal form, uniform in finished product granularity and narrow in distribution, and can be used for generating various crystal forms of calcium carbonate in different fields.

Description

technical field [0001] The invention belongs to the production field of light and nano calcium carbonate, in particular to a device for preparing precipitated calcium carbonate by supercritical carbon dioxide. Background technique [0002] PCC (Precipitated Calcium Carbonate) is the abbreviation of precipitated calcium carbonate. Calcium carbonate is a common inorganic compound and the main component of limestone (limestone for short). The molecular formula is CaCO 3 , the relative molecular weight is 100.09. Calcium carbonate is divided into light calcium carbonate, heavy calcium carbonate and active calcium carbonate according to different production methods. [0003] 1. Light calcium carbonate, also known as precipitated calcium carbonate (referred to as light calcium carbonate). It is produced by calcining limestone and other raw materials to produce lime and carbon dioxide, adding water to digest the lime to form milk of lime (mainly composed of calcium hydroxide); ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J19/18C01F11/18B82Y30/00B82Y40/00
CPCB01J19/18B01J19/0053B01J19/0066C01F11/181B82Y40/00B82Y30/00Y02P20/54
Inventor 杨靖窦明远邹帅李浩铭滕家皇邓富康李康春黄福川
Owner GUANGXI UNIV
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