Method for quantitatively measuring organic matter content in gypsum

A technology for quantitative measurement and organic matter, which is applied in the field of quantitatively measuring the content of organic matter in gypsum, can solve the problems of measuring organic matter in natural gypsum and desulfurized gypsum, etc., and achieve the effect of improving production efficiency and product quality

Inactive Publication Date: 2018-07-24
BEIJING NEW BUILDING MATERIALS PLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Correspondingly, there is no method for measuring the content of organic matter in natural gypsum and desulfurized gypsum

Method used

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  • Method for quantitatively measuring organic matter content in gypsum
  • Method for quantitatively measuring organic matter content in gypsum
  • Method for quantitatively measuring organic matter content in gypsum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A gypsum in Example 1 is natural gypsum clinker from Shandong, B gypsum in Example 2 is desulfurized gypsum clinker from Hebei, and C gypsum in Example 3 is desulfurized gypsum raw meal from Shandong .

[0027] Example 1

[0028] Weigh two samples of A gypsum clinker with a mass of 21.17 mg, and use a synchronous thermal analyzer (the instrument model is NETZSCH STA 449C) to perform DSC-TG thermal analysis measurements in nitrogen and oxygen atmospheres respectively, from room temperature at a speed of 5min / °C (25°C) to 700°C. The thermal analysis curve of A gypsum clinker sample under nitrogen and oxygen atmosphere is as follows figure 1 1a and 2a represent the DSC curves under nitrogen and oxygen atmospheres, respectively, and 1b and 2b represent the TG curves under nitrogen and oxygen atmospheres, respectively.

[0029] It can be seen from the figure that the thermal analysis curves under the two atmospheres are basically the same. An endothermic peak appeared at...

Embodiment 2

[0031] Weigh two samples of B gypsum clinker with a mass of 21.79 mg, and use a synchronous thermal analyzer (instrument model NETZSCH STA 449C) to perform DSC-TG thermal analysis and measurement in nitrogen and oxygen atmospheres respectively, from room temperature at a speed of 5min / °C (25°C) to 700°C. The thermal analysis curve of B gypsum clinker sample under nitrogen and oxygen atmosphere is as follows figure 2 1a and 2a represent the DSC curves under nitrogen and oxygen atmospheres, respectively, and 1b and 2b represent the TG curves under nitrogen and oxygen atmospheres, respectively.

[0032] It can be seen from the figure that the thermal analysis curves under the two atmospheres are basically the same. An endothermic peak appeared at 149°C, accompanied by obvious weight loss, which was caused by the dehydration of hemihydrate gypsum; an exothermic peak appeared at about 403°C, but no weight loss occurred, which is type AIII anhydrous gypsum Caused by conversion to...

Embodiment 3

[0034] Weigh two 21.22 mg C gypsum raw material samples, and use a synchronous thermal analyzer (the instrument model is NETZSCH STA 449C) to perform DSC-TG thermal analysis measurements in a nitrogen atmosphere and DTA-TG thermal analysis measurements in an oxygen atmosphere. For analysis and measurement, the temperature was raised from room temperature (20°C) to 700°C at a rate of 5min / °C. The thermal analysis curves of C gypsum raw meal samples under nitrogen and oxygen atmospheres are as follows Figure 3(a) and 3(b) 1a and 1b represent the DSC curve and TG curve under nitrogen atmosphere, respectively, and 2a and 2b represent the DTA curve and TG curve under oxygen atmosphere, respectively.

[0035] It can be seen from Figure 3(a) that a broad endothermic peak appeared at 142°C under nitrogen conditions, accompanied by obvious weight loss, which was caused by the dehydration of dihydrate gypsum and hemihydrate gypsum; at 363 There is an exothermic peak around ℃, but no ...

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Abstract

A method for quantitatively measuring organic matter content in gypsum, the method comprises the following steps: taking two gypsum samples with an equal weight for thermal analysis at the same heating rate in an inert gas atmosphere and an oxygen atmosphere respectively; according to obtained thermal analysis curves, reading out the weight loss rate of the sample in the inert gas atmosphere and the weight loss rate of the sample in the oxygen atmosphere respectively; and calculating the organic matter content in the gypsum by a formula of X = W2-W1.

Description

technical field [0001] This application relates to but is not limited to a method for quantitatively measuring the content of organic matter in gypsum. Background technique [0002] The main mineral composition of natural gypsum and desulfurized gypsum is calcium sulfate (CaSO 4 2H 2 O), in addition, also contains quartz, dolomite and clay-like substances. The applicant found in actual production that when using natural gypsum and desulfurized gypsum with high clay content as raw materials to produce gypsum boards, excessive deflection is prone to occur; natural gypsum and desulfurized gypsum with high clay content are used as raw materials and poly When carboxylic acid water reducer is used to produce gypsum board, the water reducing rate of polycarboxylate water reducer is significantly reduced, which affects normal production. The applicant believes that this is because the clay of natural gypsum and desulfurized gypsum contains relatively high content of organic matte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N5/04
CPCG01N5/04
Inventor 陈红霞周梦文王霞李帆
Owner BEIJING NEW BUILDING MATERIALS PLC
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