A multi-stage cascading method for producing nano-scale calcium carbonate by carbonization with the liquid phase as the continuous phase
A nano-scale calcium carbonate, carbonization technology, applied in chemical instruments and methods, calcium carbonate/strontium/barium, nanotechnology for materials and surface science, etc., can solve the problem of not giving product performance, and achieve savings The effect of feeding and discharging time, large production capacity and low equipment investment
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0027] The operating volume of the first-stage stirred carbonization reactor is 3L, the operating volume of the second-stage stirred carbonization reactor is 30L, and the operating volume of the third-stage two stirred carbonization reactors A and B is 30L. According to the attached figure 1 The process is connected and the operation is as follows: the concentration of calcium hydroxide emulsion is 0.80mol / L, which is continuously supplied by a peristaltic pump, the set supply speed is 120.0ml / min, the temperature is 14.0C~14.2℃, and it is introduced into the reactor by a catheter for stirring The paddles are at the same level; the carbon dioxide gas is introduced from the bottom of the reactor, the flow rate is 2.5L / min, the volume content of carbon dioxide in the carbon dioxide gas is 40V%, and the rest is air; the stirring speed of the reactor is 1200rpm, and the reactor jacket is fed into Cooling water at 16°C, after reaching a steady state, the temperature in the reactor w...
Embodiment 2
[0033] According to the same flow process and the same reactor as in Example 1, the difference is that the operating conditions are as follows: the first-stage calcium hydroxide feed rate is changed to 140mL / min, and the flow rate of carbonic acid gas is 3.5L / min, measured after the steady state The temperature in the first-stage reactor was 19.7°C; the feed rate of calcium hydroxide in the second-stage reactor was changed to 180mL / min, the flow rate of carbonic acid gas was changed to 17.5L / min, and the temperature in the second-stage reactor was measured after the steady state It is 59.4°C to 59.7°C; the ventilation rate of the third-stage reactor is changed to 1.7L / min, and the maximum temperature in the third-stage reactor is 81.8°C.
[0034] SEM photos show that the product is cubic (attached image 3 ). The BET of the product powder is 23.59m 2 / g, the free alkali content is 0.048wt%.
Embodiment 3
[0036] The operating volume of the first-stage stirred carbonization reactor is 30L, the operating volume of the second-stage stirred carbonization reactor is 60L, and the operating volume of the third-stage two stirred carbonization reactors A and B is 60L. According to the attached figure 1 Process connection, the operating conditions are as follows: the concentration of calcium hydroxide emulsion is 0.60mol / L, continuously supplied by the peristaltic pump, the set supply speed is 1000mL / min, the temperature is 15.1C~15.2℃, and it is introduced into the reactor by a conduit The paddles are at the same level; carbon dioxide gas is introduced from the bottom of the reactor, the flow rate is 30L / min, the volume content of carbon dioxide in the calcium carbonate gas is 40V%, and the rest is air; the stirring speed of the reactor is 600rpm, and the reactor jacket is fed into Cooling water at 16°C, after reaching a steady state, the temperature in the reactor was measured to be 18....
PUM
| Property | Measurement | Unit |
|---|---|---|
| particle size | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More