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A method for analyzing the grade of gypsum

A grade and gypsum technology, applied in the field of gypsum grade analysis, can solve the problems of deviation of test results, large influence, inapplicability, etc., and achieve the effect of speeding up the test process, wide test range and accurate analysis results.

Active Publication Date: 2021-03-02
BEIJING NEW BUILDING MATERIALS PLC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, both of these existing analysis methods have drawbacks
The first analysis method is to dehydrate to constant weight in an oven at 230±5°C to determine the content of crystal water in gypsum. When using this method to analyze desulfurized gypsum, the test results are greatly affected by operating experience, and the temperature has been maintained for a long time. Using the oven under the environment will greatly shorten the service life of the oven
The second analysis method is to dehydrate to constant weight in a muffle furnace at 360°C to determine the content of crystal water in gypsum. However, desulfurized gypsum often contains impurities with crystal water, and impurities with crystal water also exist at this temperature. Dehydration reaction has occurred, so the crystal water measured according to this method is often greater than the actual value, and the grade of desulfurized gypsum calculated is high
In addition, when analyzing phosphogypsum with the above two analytical methods, since phosphogypsum contains a variety of volatile organic compounds (methyl decane, dimethyl nonane, dimethyl butane, iodide undecane, iodine nonane alkane, ethyleneoxyethanol, formic acid, 3-hydroxy-2-butanone, etc.), the volatilization of organic matter during drying or calcination will also affect the accuracy of test results
Furthermore, the content of calcium sulfate dihydrate in the gypsum raw material can be calculated by measuring the crystal water content, but the content of calcium sulfate anhydrous cannot be tested. There are also large deviations in the test results of gypsum
Obviously, the above method is not suitable for determining the grade of anhydrite or mixed gypsum containing calcium sulfate

Method used

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  • A method for analyzing the grade of gypsum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] The sample to be analyzed is desulfurized gypsum raw meal, which was taken from Liaoning Huaneng Tieling Power Generation Co., Ltd.

[0059] (1) Grind the sample to be analyzed to a particle size ≤ 0.2mm (that is, all can pass through a 80-mesh standard sieve);

[0060] (2) Place the ground sample to be analyzed in a muffle furnace, spread it as flat as possible, with a thickness of 0.5-1 mm, and calcinate it at a temperature of 150 ° C for 1 min;

[0061] (3) Weigh 5-10g of the first sample to be analyzed, and record the mass as W2; weigh about 2g of the second sample to be analyzed, and record the mass as W0;

[0062] (4) Test the content of crystal water in the first sample to be analyzed

[0063] a) Wet the first sample to be analyzed with about 10g of deionized water for 1-3 days, and wash it repeatedly with deionized water three times after wetting, so as to convert all the first sample to be analyzed into dihydrate gypsum ;

[0064] b) carry out suction filtra...

Embodiment 2

[0082] The sample to be analyzed is natural anhydrite, which was obtained from Hanshan Hengtai Non-metallic Materials Company of Wanbei Coal and Electricity Group.

[0083] (1) Grind the sample to be analyzed to a particle size ≤ 0.2mm (that is, all can pass through a 80-mesh standard sieve);

[0084] (2) Place the ground sample to be analyzed in a muffle furnace, spread it as flat as possible, with a thickness of 0.5-1 mm, and calcinate it at a temperature of 150 ° C for 1 min;

[0085] (3) Weigh 5-10g of the first sample to be analyzed, and record the mass as W2; weigh about 2g of the second sample to be analyzed, and record the mass as W0;

[0086] (4) Test the content of crystal water in the first sample to be analyzed

[0087] a) Wetting the first sample to be analyzed with about 10 g of deionized water for 3 days, and washing it repeatedly with deionized water three times after wetting, so as to completely convert the first sample to be analyzed into dihydrate gypsum; ...

Embodiment 3

[0106] The test sample is raw phosphogypsum, which was taken from Zhongxiang Chuzhong Phosphating Co., Ltd.

[0107] (1) Grind the sample to be analyzed to a particle size ≤ 0.2mm (that is, all can pass through a 80-mesh standard sieve);

[0108] (2) Place the ground sample to be analyzed in a muffle furnace, spread it as flat as possible, with a thickness of 0.5-1mm, and calcinate it at a temperature of 800°C for 5 minutes;

[0109] (3) Weigh 5-10g of the first sample to be analyzed, and record the mass as W2; weigh about 2g of the second sample to be analyzed, and record the mass as W0;

[0110] (4) Test the content of crystal water in the first sample to be analyzed

[0111] a) Wet the first sample to be analyzed with about 10 g of deionized water for 1 day, and wash it repeatedly with deionized water three times after wetting, so as to completely convert the first sample to be analyzed into dihydrate gypsum;

[0112] b) carry out suction filtration with a suction filtrat...

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Abstract

A method for analyzing the grade of gypsum, said method comprising the steps of: taking by weighing two samples to be analyzed; testing the content of crystal water in the first sample to be analyzed, which is recorded as Kw; according to the formula PW1=(Kw ×172.17) / 36 to calculate the CaSO in the first sample to be analyzed 4 2H 2 O content PW1; use sulfate-reducing bacteria to reduce sulfate in the second sample to be analyzed to S 2‑ , with acid to S 2‑ into soluble H 2 S, measure H 2 The content of S is recorded as W1; calculate the SO in the second sample to be analyzed according to the formula PW2=(W1×96.98)×100% / (34.076×W0) 4 2‑ The content PW2 of the sample to be analyzed is calculated according to the formula PW=PW1+(PW2‑96.98×Kw / 36)×136.14 / 96.98. The method for analyzing gypsum grade of the present application has the advantages of wide application range, simple operation and accurate and reliable results.

Description

technical field [0001] This application relates to but not limited to building material analysis technology, especially relates to but not limited to a method for analyzing the grade of gypsum. Background technique [0002] According to the definition in the national standard GB / T 5483-2008 "Natural Gypsum", the grade of gypsum refers to the content of useful components or minerals per unit volume or unit mass of ore. Referring to its definition, gypsum stone, dihydrate gypsum and various industrial by-product gypsum (CaSO 4 2H 2 O) grade refers to the percentage of calcium sulfate dihydrate in gypsum raw materials, construction gypsum, mixed gypsum (CaSO 4 , CaSO 4 1 / 2H 2 O and CaSO 4 2H 2 O) and anhydrite (mainly CaSO 4 , the hydrated anhydrite also contains a certain amount of CaSO 4 1 / 2H 2 O and / or CaSO 4 2H 2 O) grade refers to the sum of calcium sulfate dihydrate and the percentage of calcium sulfate in gypsum raw materials. [0003] In the gypsum industry,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N5/00
CPCG01N5/00
Inventor 王丽王鹏起周梦文尹东杰王莹朱清玮
Owner BEIJING NEW BUILDING MATERIALS PLC