A method for determining the effective components of desulfurized quicklime

A technology of active ingredients and quicklime, which is applied in the direction of removing certain components such as weighing, measuring devices, and analyzing materials, which can solve the problems of large error in test results, large human errors, and large errors, and achieve accurate and reliable results. effect of error

Active Publication Date: 2018-06-01
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

But this method has the following disadvantages: (1) when titrating and adding quicklime, it should be quick, otherwise the quicklime may deliquesce and bring errors to the measurement results; (2) there are many human factors in the operation process, and the errors are relatively large; (3) ) test results cannot effectively distinguish between CaO and Ca(OH) 2 , CaCO 3 Etc content
The disadvantage of this test method is that it takes a long time, consumes a lot of energy, has a lot of human error, and the measurement result can only explain the content of calcium in the sample, but cannot effectively distinguish CaO and Ca(OH) 2 , CaCO 3 Etc content
[0006] CN 104090066A discloses a device and method for measuring CaO content in quicklime. The measuring process is as follows: after weighing the sample and container, check the device, then put a certain amount of raw rock into the reaction barrel, and then add an appropriate amount of water to digest it to form Lime milk and ash slag, then separate the lime milk and ash slag with water, and finally titrate the lime milk with hydrochloric acid, and calculate the CaO content by formula (1): The disadvantage of this method is that the process is complicated, and human error is brought about in the operation process, resulting in inaccurate measurement results.
[0007] Therefore, the existing quicklime test methods have problems such as complicated process, chemical analysis method, serious human influence factors, large error in test results, and difficulty in distinguishing active ingredients. content method

Method used

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  • A method for determining the effective components of desulfurized quicklime
  • A method for determining the effective components of desulfurized quicklime
  • A method for determining the effective components of desulfurized quicklime

Examples

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Effect test

Embodiment 1

[0042] In this embodiment, the method for determining the effective components of desulfurized quicklime is determined by the following method, which specifically includes the following steps (the method flow is as follows: figure 1 shown):

[0043] (1) Put 100 mg of the dried desulfurized quicklime sample into a thermogravimetric analyzer for thermogravimetric measurement. During the thermogravimetric measurement, the heating rate is 10°C / min, and the temperature is raised from room temperature to 1100°C. Analyze the decomposition products. Such as figure 2 As shown, only H was detected in the infrared curve of the desulfurized quicklime decomposition sample 2 O and CO 2 , corresponding to image 3 The thermogravimetric temperature in the thermogravimetric curve shown is between 267-607°C and 667-875°C. The analysis shows that the product decomposed in the first weightloss stage is H 2 O, the weight loss percentage is 4.567% (x H2O ), according to the decomposition tem...

Embodiment 2

[0056] The difference between this example and Example 1 is that the amount of desulfurized quicklime sample is 50 mg and put into a thermogravimetric analyzer for thermogravimetric measurement. During the thermogravimetric measurement, the heating rate is 5°C / min, from room temperature to 900°C The same method as in Example 1 was used to measure the effective components and content of the desulfurized quicklime sample, and only H was detected in the infrared curve of the desulfurized quicklime sample. 2 O and CO 2 , the temperature ranges corresponding to the first and second weight loss stages in the thermogravimetric curve are 302-634°C and 673-882°C respectively, the weight loss percentage in the first weight loss stage is 4.893%, and the weight loss percentage in the second weight loss stage is 4.673%; Contain elements such as Ca, Mg, Si, O in the X-ray fluorescence spectrometer measurement undecomposed sample, their mass percentages are respectively 70.41%, 1.86%, 1.02%,...

Embodiment 3

[0058] The difference between this example and Example 1 is that the amount of desulfurized quicklime sample is 50 mg and put into a thermogravimetric analyzer for thermogravimetric measurement. During the thermogravimetric measurement, the heating rate is 10°C / min, from room temperature to 980°C The content of active ingredient in the desulfurized quicklime sample is obtained after the same method of embodiment 1 is measured, and only H is detected in the infrared curve of the desulfurized quicklime decomposed sample. 2 O and CO 2 , the temperature ranges corresponding to the first and second weight loss stages in the thermogravimetric curve are 268-613°C and 672-882°C respectively, the weight loss percentage in the first weight loss stage is 4.582%, and the weight loss percentage in the second weight loss stage is 4.621% ; The X-ray fluorescence spectrometer determined that the undecomposed sample contained Ca, Mg, Si, O and other elements, and their mass percentages were 65...

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Abstract

The invention provides a method for determining the effective components of desulfurized quicklime. The method is as follows: analyzing and determining the type and content of the decomposable active components in the desulfurized quicklime sample, and then performing elemental analysis on the undecomposed sample to determine the decomposed sample The content of the active ingredients contained in the desulfurized quicklime sample is determined. The present invention utilizes thermogravimetric-infrared combination combined with X-ray fluorescence spectrum to measure the content of effective components in desulfurized quicklime. This method greatly reduces the error caused by human operation and can effectively distinguish CaO and Ca(OH) of desulfurized quicklime samples. 2 and CaCO3 content, the results are accurate and reliable.

Description

technical field [0001] The invention belongs to the field of flue gas desulfurization, and relates to a method for measuring effective components of desulfurized quicklime. Background technique [0002] As an important desulfurizer, quicklime is mainly used in flue gas desulfurization processes in coal-fired power plants, coal-fired boilers, industrial kilns and other industries. The content of its active components directly determines the effect of flue gas desulfurization. The main component of quicklime is calcium oxide (CaO). Due to the unique physical and chemical characteristics of CaO, it is easy to deliquesce in the air, and it is easy to deliquesce with the H in the air. 2 O and CO 2 A reaction occurs to form Ca(OH) 2 , CaCO 3 and other substances, resulting in a reduction in the activity of quicklime. Different desulfurization processes have different requirements for active ingredients, such as only CaO and Ca(OH) in dry flue gas desulfurization process 2 It ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N5/04G01N21/3504G01N23/223
Inventor 朱廷钰郭旸旸高翔
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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