Method for reducing production energy consumption of nano calcium carbonate

A technology of nano calcium carbonate and energy consumption, applied in the direction of calcium carbonate/strontium/barium, nanotechnology, nanotechnology, etc., can solve the problems of lack of universal applicability and high energy consumption, and shorten the carbonization reaction time and activation degree. The effect of high and low production energy consumption

Inactive Publication Date: 2021-08-13
安徽前江超细粉末科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the problems existing in the prior art, the purpose of the present invention is to provide a method for reducing energy consumption in the production of nano-calcium carbonate, so as to solve the problems of large energy consumption and no universal applicability in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] In a carbonization reaction kettle with a capacity of 1L, add 0.6L of calcium hydroxide suspension with a concentration of 7.5%;

[0040]Adjust the temperature of the suspension to 25°C through a temperature control device, add 0.3g of sucrose (additive 1) and 0.0012g of surfactant FS31 (additive 2) to the suspension and mix well;

[0041] After mixing evenly, pass the mixed gas for carbonization. The volume flow rate of carbon dioxide in the mixed gas is 60mL / min, and the volume flow rate of nitrogen gas is 340mL / min. When the pH of the suspension drops to 7.0, continue to ventilate for 10 minutes to complete the carbonization reaction after carbonization. The temperature of the suspension is about 45°C;

[0042] Add 2.4g potassium oleate to carry out surface treatment to the nano-calcium carbonate suspension, and the treatment time is 1h;

[0043] After the treatment is completed, the suspension is suction-filtered, and the filter cake is dried in an oven at 80° C., ...

Embodiment 2

[0045] In a carbonization reactor with a capacity of 1L, add 0.6L of 11% calcium hydroxide suspension;

[0046] Adjust the temperature of the suspension to 30°C through a temperature control device, add 0.9g of zinc sulfate (additive 1) and 0.002g of surfactant BYK-346 (additive 2) to the suspension and mix well;

[0047] After mixing evenly, pass the mixed gas for carbonization. The volume flow rate of carbon dioxide in the mixed gas is 120mL / min, and the volume flow rate of nitrogen gas is 240mL / min. When the pH of the suspension drops to 7.0, continue to ventilate for 10 minutes to complete the carbonization reaction after carbonization. The temperature of the suspension is about 55°C;

[0048] Add 2.4g polyoxyethylene monostearate to carry out surface treatment to nano-calcium carbonate suspension, treatment time 1h;

[0049] After the treatment is completed, the suspension is suction-filtered, and the filter cake is dried in an oven at 80° C., crushed and depolymerized t...

Embodiment 3

[0051] In a carbonization reaction kettle with a capacity of 1L, add 0.6L of calcium hydroxide suspension with a concentration of 7.5%;

[0052] Adjust the temperature of the suspension to 35°C through a temperature control device, add a mixture of 0.3g sucrose and 0.3g triethanolamine (additive 1) and 0.0018g surfactant FS520 (additive 2) to the suspension and mix well;

[0053] After mixing evenly, pass the mixed gas for carbonization. The volume flow rate of carbon dioxide in the mixed gas is 60mL / min, and the volume flow rate of nitrogen gas is 540mL / min. When the pH of the suspension drops to 7.0, continue to ventilate for 10 minutes to complete the carbonization reaction after carbonization. The temperature is about 60°C;

[0054] Add 2.4g polyoxyethylene monolaurate to carry out surface treatment to the nano-calcium carbonate suspension, and the treatment time is 1h;

[0055] After the treatment is completed, the suspension is suction-filtered, and the filter cake is d...

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Abstract

The invention discloses a method for reducing energy consumption in nano calcium carbonate production, and belongs to the field of nano calcium carbonate preparation, the method for reducing the energy consumption in nano calcium carbonate production comprises the following steps: S1, adding water to dilute refined lime milk, adjusting to a suspension with calcium hydroxide concentration of 7-12%, and adding into a carbonization reactor; s2, adjusting the temperature of the calcium hydroxide suspension to 10-40 DEG C, then adding an additive 1 and an additive 2 into the suspension, and uniformly mixing; and S3, introducing carbonization gas with the CO2 volume concentration of 10-100% into the suspension liquid to carry out carbonization reaction, continuously introducing the carbonization gas for 10-30 minutes to carry out over-carbonization when the pH value of the suspension liquid is reduced to 7.0, and obtaining a nano calcium carbonate suspension liquid at the temperature of 30-70 DEG C after the carbonization is finished. According to the method, the productivity and the equipment utilization rate are improved, the production energy consumption is reduced, the produced nano calcium carbonate product is high in activation degree and low in oil absorption value, the process is simple and feasible, existing process equipment does not need to be changed, the production cost is low, and good economic benefits and social benefits are achieved.

Description

technical field [0001] The invention relates to the field of preparation of nano-calcium carbonate, more specifically, relates to a method for reducing energy consumption in the production of nano-calcium carbonate. Background technique [0002] Nano-calcium carbonate refers to precipitated calcium carbonate with a primary particle size in the range of 0-100nm. It is used in the fields of adhesives, inks, plastics, rubber, and automotive primers. It has significant functions such as strengthening, toughening, and regulating thixotropic properties. It is a high-end product in precipitated calcium carbonate. my country's calcium carbonate industry is an industry with high energy consumption, and energy consumption accounts for more than 65% of the production cost of nano calcium carbonate on average. Therefore, reducing the production energy consumption of nano-calcium carbonate is of great significance to enhance the competitiveness of enterprises. [0003] The various proc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18B82Y30/00B82Y40/00
CPCC01F11/183B82Y30/00B82Y40/00C01P2004/64
Inventor 陈婷孔凡滔程颖慧吴国栋
Owner 安徽前江超细粉末科技有限公司
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