Process for controlling particle size of nano calcium carbonate for sulfur fixation by alternating magnetic field

A nano-calcium carbonate and alternating magnetic field technology, which is applied in the field of technology, can solve the problems that the particle size of nano-calcium carbonate is difficult to precisely control, cannot produce solid sulfur, and has a narrow distribution, so as to improve the reaction performance of solid sulfur and improve dimensional stability. the effect of broadening the application field

Inactive Publication Date: 2016-09-21
深圳市第四能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the above process, relying on CO 2 Concentration, carbonization temperature, calcium oxide concentration and control agent are four factors that control the particle size of nano-calcium carbonate, but because the reaction process is very fast, the four factors have multiple intersections, so the particle size of nano-calcium carbonate is difficult to be accurate control
Unable to produce nano-calcium carbonate with "narrow distribution" and "large equivalent particle size" required for sulfur fixation

Method used

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Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0021] This embodiment adopts following process steps:

[0022] 1. Limestone (CaCO 3 ) calcined to obtain calcium oxide and CO 2 ;

[0023] 2. Add water to dissolve calcium oxide and generate suspended calcium hydroxide;

[0024] 3. Use multi-stage hydrocyclone separation to remove particles and impurities to obtain calcium hydroxide suspension;

[0025] 4. Increase the alternating magnetic field outside the reactor;

[0026] 5. The calcium hydroxide solution flows through the alternating magnetic field at a speed of 12m / s. At the same time, from the main channel of the calcium hydroxide solution, the branch trace solution enters the microscope observation range;

[0027] 6. Slowly release the CO 2 The gas is passed into the calcium hydroxide solution, and the flow of CO is controlled by a flow meter. 2 The flow rate of the gas, the moment when the microscopic crystals appear is the moderate CO 2 gas flow. maintain this CO 2 Gas flow until crystallization is complete....

specific Embodiment approach 2

[0029] This embodiment adopts following process steps:

[0030] 1. Limestone (CaCO 3 ) calcined to obtain calcium oxide and CO 2 ;

[0031] 2. Add water to dissolve calcium oxide and generate suspended calcium hydroxide;

[0032] 3. Use multi-stage hydrocyclone separation to remove particles and impurities to obtain calcium hydroxide suspension;

[0033] 4. Increase the alternating magnetic field outside the reactor;

[0034] 5. The calcium hydroxide solution flows through the alternating magnetic field at a speed of 13m / s, and at the same time, from the main channel of the calcium hydroxide solution, the branch trace solution enters the microscope observation range;

[0035] 6. Slowly release the CO 2 The gas is passed into the calcium hydroxide solution, and the flow of CO is controlled by a flow meter. 2 The flow rate of the gas, the moment when the microscopic crystals appear is the moderate CO 2 gas flow. maintain this CO 2 Gas flow until crystallization is compl...

specific Embodiment approach 3

[0037] This embodiment adopts following process steps:

[0038] 1. Limestone (CaCO 3 ) calcined to obtain calcium oxide and CO 2 ;

[0039] 2. Add water to dissolve calcium oxide and generate suspended calcium hydroxide;

[0040] 3. Use multi-stage hydrocyclone separation to remove particles and impurities to obtain calcium hydroxide suspension;

[0041] 4. Increase the alternating magnetic field outside the reactor;

[0042] 5. The calcium hydroxide solution flows through the alternating magnetic field at a speed of 14m / s, and at the same time, from the main channel of the calcium hydroxide solution, the branch trace solution enters the microscope observation range;

[0043] 6. Slowly release the CO 2 The gas is passed into the calcium hydroxide solution, and the flow of CO is controlled by a flow meter. 2 The flow rate of the gas, the moment when the microscopic crystals appear is the moderate CO 2 gas flow. maintain this CO 2 Gas flow until crystallization is compl...

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Abstract

The invention discloses a process for controlling particle size of nano calcium carbonate for sulfur fixation by an alternating magnetic field and relates to the technical field of technologies. The process comprises the steps: additionally arranging the alternating magnetic field outside a reactor; enabling a calcium hydroxide solution to flow through the alternating magnetic field at the rate of 12m / s to 15m / s, and meanwhile, enabling a branch trace solution to enter a microscope observation range from a main passage of the calcium hydroxide solution; slowly introducing CO2 gas into the calcium hydroxide solution, controlling the flow rate of introduced CO2 gas by a flowmeter, and observing the moment when microscopic crystals appear, i.e., appropriate CO2 gas flow; and maintaining the CO2 gas flow until crystallization is completed. According to the process for controlling the particle size of the nano calcium carbonate for sulfur fixation by the alternating magnetic field, disclosed by the invention, by the alternating magnetic field, the agglomeration among calcium carbonate grains is controlled, the dimensional stability is improved, and the phase interfacial tension is lowered, so that the sulfur fixation reaction performance of the nano calcium carbonate is improved, the nano calcium carbonate can have relatively good sulfur fixation capability under the condition of low use level, and thus the field of application of the nano calcium carbonate is widened.

Description

technical field [0001] The invention relates to the technical field of technology, in particular to a technology for controlling the particle size of nano calcium carbonate for sulfur fixation by means of an alternating magnetic field. Background technique [0002] Nano-scale nano-calcium carbonate is a new type of nano-solid material developed in the 1980s. Nano-calcium carbonate refers to ultra-fine powder calcium carbonate with a particle size between 1nm and 100nm, including ultra-fine calcium carbonate (particle size 0.02μm-0.1μm) and ultra-fine calcium carbonate (particle size less than or equal to 0.02 μm) for two calcium carbonate products. In the production of nano-calcium carbonate, the calcium carbonate crystal size, crystal shape, particle size distribution and dispersion performance are important quality indicators. Nano-calcium carbonate products with small particle size, uniform distribution and good dispersion performance have higher economic value. [000...

Claims

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Application Information

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IPC IPC(8): C01F11/18B82Y30/00
CPCB82Y30/00C01F11/181C01P2004/64
Inventor 胡小芳邹俊杰
Owner 深圳市第四能源科技有限公司
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