Test method of sulphate content of desulfurization gypsum

A technology of desulfurization gypsum and testing method, which is applied in the direction of removing a certain component and weighing, etc., can solve the problems of time-consuming, cumbersome, and high personnel quality requirements, and achieves the effect of simple and fast method, simplified analysis steps, and reduced experimental instruments.

Inactive Publication Date: 2010-01-13
HEBEI ELECTRIC POWER RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One of the main problems of gravimetric determination of sulfate content is that it is too cumbersome and time-consuming. It takes at least two days to give the analysis results, and the analysis results cannot be used to guide the operation of the desulfurization system in time; Personnel with high operational skills

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Weigh 5g of the gypsum sample to be tested; heat and dry it in a drying oven at 48°C for 1 hour, put it in a desiccator and cool it to room temperature, and weigh it with a ten-thousandth balance. So repeated heating, weighing, until constant weight, its weight W is 4.5672g.

[0041] (2) Put the gypsum sample in a muffle furnace, heat and dry at 360°C for 1 hour, put it in a desiccator to cool to room temperature, and weigh it with a ten-thousandth balance. So repeated heating, weighing, until constant weight, its weight W 1 It is 3.6806g.

[0042] The calculation method of crystal water content in gypsum samples is:

[0043] Crystal water content X (%) = 19.41

[0044] The calculation method of sulfate content is: the sulfate content is expressed by the content of calcium sulfate dihydrate;

[0045] (3) CaSO 4 .2H 2 O(%)=92.76.

Embodiment 2

[0047] (1) Weigh 4g of the gypsum sample to be tested; heat and dry it in a drying oven at 45°C for 50 minutes, put it in a desiccator and cool it to room temperature, and weigh it with a ten-thousandth balance. So repeated heating, weighing, until constant weight, its weight W is 3.7750g.

[0048] (2) Put the gypsum sample in a muffle furnace, heat and dry at 370°C for 30 minutes, put it in a desiccator to cool to room temperature, and weigh it with a ten-thousandth balance. So repeated heating, weighing, until constant weight, its weight W 1 It is 3.0116g.

[0049] The calculation method of crystal water content in gypsum samples is:

[0050] Crystal water content X (%) = 20.22

[0051] The calculation method of sulfate content is: the sulfate content is expressed by the content of calcium sulfate dihydrate;

[0052] (3) CaSO 4 .2H 2 O(%)=96.63.

Embodiment 3

[0054] (1) Weigh 3g of the gypsum sample to be tested; heat and dry it in a drying oven at 42°C for 30 minutes, put it in a desiccator and cool it to room temperature, and weigh it with a ten-thousandth balance. So repeated heating, weighing, until constant weight, its weight W is 2.7572g.

[0055] (2) Put the gypsum sample in a muffle furnace, heat and dry at 350°C for 50 minutes, put it in a desiccator to cool to room temperature, and weigh it with a ten-thousandth balance. So repeated heating, weighing, until constant weight, its weight W 1 is 2.2284g.

[0056] The calculation method of crystal water content in gypsum samples is:

[0057] Crystal water content X (%) = 19.18

[0058] The calculation method of sulfate content is: the sulfate content is expressed by the content of calcium sulfate dihydrate;

[0059] (3) CaSO 4 .2H 2 O(%)=91.64.

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Abstract

The invention provides a test method of the sulphate content of desulfurization gypsum, comprising the following steps: 3-5 grams of gypsum samples are taken to be heated and dried for 30-60 minutes in a baking oven with the temperature of 42-48 DEG C and then placed into a drier to be cooled to room temperature and weighed by a 1/10000 level balance, the gypsum samples are repeatedly heated and weighed till the gypsum samples have constant weight, and the weight W (g) of the gypsum samples is recorded; the gypsum samples are placed back to the baking oven to be heated and dried for 30-60 minutes under the temperature of 350-370 DEG C and then placed into the drier to be cooled to the room temperature and weighed by the 1/10000 level balance, the gypsum samples are repeatedly heated and weighed till the gypsum samples have constant weight, and the weight W1 (g) of the gypsum samples is recorded; the computation of the crystallization water content of the gypsum samples is as follows: the crystallization water content X(%)=(W-W1)*100/W, and the computation of the sulphate content of the gypsum samples is as follows: the sulphate content is indicated by calcium sulphate dehydrate content, CaSO4.2H2O(%)=X*100/20.9275. The method is simple, convenient and fast; and in addition, compared with the prior art, the invention greatly enhances the analysis speed, simplifies the analysis steps and decreases the experimental apparatus.

Description

technical field [0001] The invention relates to a rapid determination method for sulfate content in desulfurized gypsum. Background technique [0002] The sulfate content in desulfurized gypsum is the main index to measure the quality of gypsum; in the actual flue gas desulfurization project, it is also a main parameter to measure the operation status of the desulfurization system, and the operating parameters of the desulfurization system need to be adjusted in time according to the sulfate content . At present, due to the short operation time of the desulfurization system in my country, there is no test method for the sulfate content in desulfurization gypsum. At present, the determination of sulfate content in desulfurized gypsum basically adopts the sulfate gravimetric method in GB / T5484-2000 "Methods for Chemical Analysis of Gypsum". One of the main problems of gravimetric determination of sulfate content is that it is too cumbersome and time-consuming. It takes at le...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N5/04
Inventor 宋晓红杨杰刁建志
Owner HEBEI ELECTRIC POWER RES INST
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