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Method for measuring content of calcium oxide in lime

A calcium oxide and calcium hydroxide technology, which is applied in measuring devices, instruments, scientific instruments, etc., can solve the problems of indistinguishable and high detection results, and achieve the effects of accurate calcium oxide content, simple operation process, and improved effective utilization.

Inactive Publication Date: 2015-10-28
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] But the contriver finds, these measuring methods all are the calcium ion or the hydroxide ion after the lime dissolving of measuring, can't distinguish the calcium oxide content obtained is the content of original quicklime in the sample, or the content of calcium hydroxide in the original sample, The test results were all high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The method of the embodiment of the present invention is used to determine the content of calcium oxide in lime for sludge conditioning in a thermal power plant. The steps are as follows:

[0028] (1) Take 10.0g of the sample, dry it in an oven at 105°C-110°C for 2 hours, take it out and place it in a desiccator, and cool it to room temperature naturally;

[0029] (2) Weigh 0.5000g of the above-mentioned dried sample, accurate to ±0.0002g, dissolve the sample in a 1L volumetric flask at 25°C, dissolve the sample with secondary reagent water and make the volume constant;

[0030] (3) Take 100 mL of the above-mentioned constant volume water sample for total alkalinity titration, and calculate the number of moles of all hydroxide ions in the sample solution;

[0031] (4) Dry the slow quantitative filter paper in an oven at 105°C-110°C for 2 hours, take it out after drying and place it in a desiccator, cool it naturally to room temperature, and weigh its accurate quality;

[0032] (5...

Embodiment 2

[0041] Prepare a mixture of known calcium oxide content, including impurities such as calcium hydroxide, calcium carbonate, silicon dioxide, etc., and use the method of the embodiment of the present invention to determine the content of calcium oxide in the sample, and the steps are as follows:

[0042] (1) Preparation mixture: Weigh 6.0g analytically pure calcium oxide, 3.0g analytically pure calcium hydroxide, 0.5g analytically pure calcium carbonate, 0.5g silica, totaling 10.0g (where the calcium oxide content is 60%), accurate To ±0.01g, grind evenly with an agate mortar;

[0043] (2) Place the mixture in (1) in an oven at 105°C-110°C for 2 hours to dry at a constant weight, after drying, take it out and place in a desiccator, and cool to room temperature naturally;

[0044] (3) Weigh 0.5000g of the dried sample in (2), accurate to ±0.0002g, dissolve the sample in a 1L volumetric flask at 25℃, and dissolve the sample with secondary reagent water to a constant volume ;

[0045] (4...

Embodiment 3

[0050] Prepare a mixture of known calcium oxide content, including impurities such as calcium hydroxide, calcium carbonate, silicon dioxide, etc., and use the method of the embodiment of the present invention to determine the content of calcium oxide in the sample, and the steps are as follows:

[0051] (1) Preparation mixture: Weigh 14.0g analytically pure calcium oxide, 4.0g analytically pure calcium hydroxide, 1.0g analytically pure calcium carbonate, 1.0g silica, totaling 20.0g (including 70% calcium oxide content), accurate To ±0.01g, grind evenly with an agate mortar;

[0052] (2) Place the mixture in (1) in an oven at 105°C-110°C for 2 hours to dry at a constant weight, after drying, take it out and place in a desiccator, and cool to room temperature naturally;

[0053] (3) Weigh 0.5000g of the dried sample in (2), accurate to ±0.0002g, dissolve the sample in a 1L volumetric flask at 25℃, and dissolve the sample with secondary reagent water to a constant volume ;

[0054] (4) ...

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Abstract

The present invention discloses a method for measuring the content of calcium oxide in lime. Calcium hydroxide generates calcium hydrate in water, and the part of calcium hydrate dissolving in water is completely ionized into hydroxyl ions and calcium ions; all-alkalinity titration is conducted to measure the molar amount of hydroxyl ions in a sample solution; a filtration weighing method is employed to obtain the weight of undissolved substance in the sample; the operation process is simple; the total weight of calcium oxide and calcium hydroxide in the sample is calculated; and equations are employed to obtain the accurate content of calcium oxide in lime calcium. The method has the advantages of accurate results, and improved effective utilization of the sample.

Description

Technical field [0001] The invention relates to the field of sludge conditioning of industrial wastewater treatment units in thermal power plants, in particular to a method for determining the content of calcium oxide in lime. Background technique [0002] The industrial wastewater advanced treatment unit of thermal power plant will produce a large amount of sludge during normal operation. The metal ions contained in the sludge need to be stabilized and then landfilled or other safety measures are taken; in recent years, calcium oxide (quicklime) sludge Conditioning technology has been widely used, mainly using the principle that calcium oxide is dissolved in water to generate calcium hydroxide and release a lot of heat. The partial ionization of calcium hydroxide dissolved in water to generate hydroxide ions can adjust the pH value of sludge. , The heat generated can kill bacteria and other microorganisms in the sludge, and at the same time make the sludge dry. Calcium oxide ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N5/00
Inventor 杨圣超白春会邱晓涛李国斌潘好伟张亮胡自书
Owner STATE GRID CORP OF CHINA
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