Method and device for measuring free calcium oxide in cement or coal ash by microwave heating

A technology of free calcium oxide and microwave heating, which is used in the field of microwave heating to measure free calcium oxide in cement or fly ash, which can solve the problem that the production line cannot adjust the composition in time, the dissolution efficiency of free calcium oxide is low, and the service life of the electric heating wire is short, etc. problems, to achieve the effect of reducing the number of dissolutions, fast heating, and long service life of the device

Inactive Publication Date: 2008-10-29
榆林恒源利尔新型建材科技有限公司
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Problems solved by technology

All free calcium oxide determination methods are traditional heating methods. The outstanding problems are slow measurement speed, short service life of electric heating wire, and low dissolution efficiency of free calcium oxide. Due to slow measurement speed, it cannot be measured synchronously with production. As a result, the test results can only come out after the product is formed. The late test results bring irreparable defects to the assembly line that cannot adjust certain components in time.

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  • Method and device for measuring free calcium oxide in cement or coal ash by microwave heating

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preparation example Construction

[0023] (1) Preparation of eluate

[0024] The dissolution solution of free calcium oxide in cement or fly ash can be a mixture of glycerol, ethylene glycol or ethylene glycol ethanol, which is consistent with the traditional dissolution medium of free calcium oxide. Usually ethylene glycol-ethanol mixture is used after mixing according to the volume ratio of 2:1;

[0025] (2) Put 0.3g to 0.5g of weighed cement or fly ash in a flask with a ground mouth (or a conical flask with a ground mouth), and then add an indicator that has been treated with sodium hydroxide in advance. 18 ml to 22 ml of ethylene glycol-ethanol mixture, and place the ground flask in a household microwave oven. A hole is made on the top of the household microwave oven, and the glass serpentine condenser tube passes through it to connect with the ground flask placed in the microwave oven hall;

[0026] (3) Set the heating time for 2 to 5 minutes, the heating power is greater than 450 watts, turn on the micr...

Embodiment 1

[0032] Take 0.4065 grams of cement with a fineness of 10.4% (85 micron sieve), add 20 milliliters of ethylene glycol-ethanol solution, put it in a ground conical flask, select 70% of the microwave power of 1 kilowatt, and heat it by microwave for 3 minutes , and then titrated with standard benzoic acid solution, the measured free calcium oxide content was 3.54%, and the standard method error was -0.01%.

Embodiment 2

[0034] Get 0.4143 grams of cement fineness of 10.4% (85 micron sieve), add 20 milliliters of ethylene glycol-ethanol solution, place the ground conical flask, select 50% of the microwave power of 1 kilowatt, heat for 4 minutes, and then Titrated with standard benzoic acid solution, the measured free calcium oxide content was 3.56%, and the standard method error was +0.01%.

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Abstract

The invention discloses a method and device for measuring free calcium oxide in cement or fly ash by microwave heating; the method comprises the following steps: the cement or the fly ash and a free calcium oxide dissolving-out agent are placed in a ground conical flask; after the refluxing heating is carried out in a microwave oven, the free calcium oxide is dissolved out, and the content of the free calcium oxide in the sample is finally determined by dipping benzoic acid standard solution; the device comprises that: a heating power knob and a heating time knob are connected with the microwave oven, the internal cavity of the microwave oven is provided with the conical flask, a condensing tube is inserted into the upper end of the conical flask, the upper end of the condensing tube is communicated with a circulating cooling water tank, the lower end thereof is communicated with a circulating pump, and the internal cavity of the conical flask is provided with the cement or the fly ash sample and free calcium oxide dissolving-out medium; by adopting the microwave oven as a heating source, the heating speed is fast, the heating is started from the inner part of the solution with convenient operation, the dissolving-out speed of the free calcium oxide is obviously improved, the dissolving-out times are reduced, the measuring speed is improved, the microwave heating has high heat efficiency and can save energy and the device has long service life.

Description

technical field [0001] The invention relates to a method and a device for measuring the content of free calcium oxide in cement and fly ash, in particular to a method and a device for measuring free calcium oxide in cement or fly ash by microwave heating. Background technique [0002] As we all know, free calcium oxide in cement is related to the volume stability of cement and concrete. It is an item strictly controlled in the national standard of cement production technology. Therefore, in the cement production process, the determination of free calcium oxide content in cement clinker is an important Indispensable test items. [0003] And in the high-calcium fly ash with calcium oxide content greater than 10% (weight), the existence of free calcium oxide brings hidden dangers for the application of high-calcium fly ash in cement and concrete. According to the national technical standards on high-calcium fly ash, most high-calcium fly ash cannot be directly added to cement ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/16G01N1/44
Inventor 赵鹏李东林王晓宁
Owner 榆林恒源利尔新型建材科技有限公司
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