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Method for controlling content of crystal water in hydrate and application

A technology of hydrate and crystal water, which can be used in measurement devices, instruments, analytical materials, etc., and can solve the problem that the content of crystal water of hydrate is difficult to effectively control.

Pending Publication Date: 2022-05-13
中国建筑材料工业规划研究院
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problem in the prior art that the crystal water content of hydrates (such as gypsum) is difficult to effectively control, and to provide a method and application for controlling the crystal water content in hydrates

Method used

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  • Method for controlling content of crystal water in hydrate and application

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0060] The purpose of this embodiment is to obtain building gypsum. According to the ideal crystal water content of building gypsum is 5.27%, then the target crystal water content after calcination in this embodiment is set to 5.27%.

[0061] (1) Change relationship construction

[0062] Take a small amount of the gypsum to be treated, and measure the relationship F(x) between its electrical conductivity and crystal water through experiments under laboratory conditions. After 2-5 minutes, take it out and measure its conductivity and crystal water data; repeat this operation until the crystal water is lower than 0.1. Take the crystal water content (unit: weight %) as the abscissa, and take the electrical conductivity (unit: ms / cm) as the ordinate to draw a scatter diagram, such as figure 1 Shown, with computer fitting function equation F(x), F(x)=1.00093+0.92052 / (1+exp(x-x 0 ) / dx)), R 2 =0.9957,x 0 is the crystal water content in the gypsum to be treated.

[0063] (2) Prep...

Embodiment 2

[0078] The same gypsum as in Example 1 was selected, except that the target crystal water content in this example was 8.00%. This embodiment is used to embody the method of the present invention, which can obtain gypsum products with any crystal water content as required, so that it can be applied to various application modes.

[0079] (1) The variation relationship F(x) is the same as that in Example 1.

[0080] (2) Use the same rotary kiln and monitoring points as in Example 1. According to the initial crystal water content and the target crystal water content, set N 2 The target crystal water content is 14.1%, N 3 The target crystal water content is 11.65%, N 4 The target crystal water content is 9.94%, N 5 The target crystal water content is 8.14%. According to the functional relationship F(x) between the conductivity of the hydrate and the water of crystallization, N 2 to N 5 Respectively corresponding target conductivity R 2 to R 5 They are 0.9087, 0.6141, 0.317...

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Abstract

The invention relates to the field of material treatment, in particular to a method for controlling the content of crystal water in hydrate and application. The method comprises the steps that monitoring points N1 to Ni are used for monitoring the hydrate to obtain a monitoring signal, the monitoring signal comprises the instant conductivity R1 to Ri of the hydrate, i is an integer larger than or equal to 3, and the monitoring points are arranged on the advancing route of the hydrate; determining target conductivity R01 to R0i corresponding to the monitoring points N1 to Ni; and calculating the deviation between the instant conductivity and the target conductivity, and adjusting the calcination condition of the advancing route based on the deviation. The method provided by the invention can conveniently and effectively control the content of crystal water to meet the set requirements, and can realize very high uniformity. The method disclosed by the invention is particularly suitable for a process for removing crystal water by calcining gypsum.

Description

technical field [0001] The invention relates to the field of material processing, in particular to a method and application for controlling the crystal water content in hydrates. Background technique [0002] Because the formation temperature regions of some phases in calcined gypsum are interlaced, the gypsum produced under certain conditions is a mixed phase dominated by a certain phase, which may include dihydrate gypsum, hemihydrate gypsum, soluble anhydrous gypsum and anhydrous gypsum. Water gypsum AⅡ. Crystal water is an important guiding parameter to control the quality of building gypsum. Theoretically speaking, to make dihydrate gypsum generate as much hemihydrate gypsum as possible, that is to make the crystal water of building gypsum as close to 6.2% as possible. However, the purity of gypsum used in actual production is almost impossible to be 100%. If it is used for construction, the purity of gypsum is generally 75% to 90%. Therefore, in order to achieve the...

Claims

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Application Information

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IPC IPC(8): G01N27/04C04B11/02C04B11/028
CPCG01N27/041C04B11/02C04B11/028
Inventor 石存兰索也兵张彦林魏泽林高宁赵旭东陈蛟龙杜程李恒罗翊伦
Owner 中国建筑材料工业规划研究院
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