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Method for determining content of calcium hydroxide in lime

A technology of calcium hydroxide and calcium oxide, which is applied to measuring devices, chemical analysis by titration, instruments, etc., can solve the problems of inaccurate and indistinguishable calcium hydroxide content, so as to improve the effective utilization rate, accurate content, The effect of simple operation process

Active Publication Date: 2015-09-09
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the inventors have found that these assay methods cannot distinguish whether the obtained calcium hydroxide content is the original slaked lime content in the sample, or the slaked lime content generated by the reaction after calcium oxide is dissolved in water; the obtained calcium hydroxide content is inaccurate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Adopt the method for the embodiment of the present invention to measure the content of calcium hydroxide in the used high-purity lime powder of a thermal power plant, its steps are as follows:

[0028] (1) Take 10.0g of the sample, dry it in an oven at 105°C-110°C to a constant weight for 2 hours, take it out after drying, place it in a desiccator, and cool it down 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, fully dissolve the sample with secondary reagent water, and then constant volume;

[0030] (3) get the solution 100mL after above-mentioned constant volume and carry out full alkalinity titration, calculate the molar number of all hydroxide radicals in the sample solution;

[0031] (4) Dry the slow quantitative filter paper in an oven at 105°C-110°C to a constant weight for 2 hours, take it out after drying, place it in a desiccator, cool it...

Embodiment 2

[0041] Prepare the mixture of known calcium hydroxide content, including impurities such as calcium oxide, calcium carbonate, silicon dioxide, adopt the method for measuring the content of calcium hydroxide in the sample of the embodiment of the present invention, its steps are as follows:

[0042] (1) Preparation mixture: take by weighing 8.0g analytically pure calcium hydroxide, 1.0g analytically pure calcium oxide, 0.5g analytically pure calcium carbonate, 0.5 gram of silicon dioxide, a total of 10.0g (wherein the calcium hydroxide content is 80%), Accurate to ±0.01g, grind evenly with agate mortar;

[0043] (2) Dry the mixture in (1) in an oven at 105°C-110°C to a constant weight for 2 hours, take it out after drying, place it in a desiccator, and cool it down 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°C, fully dissolve the sample to volume with secondary rea...

Embodiment 3

[0050] Prepare the mixture of known calcium hydroxide content, including impurities such as calcium oxide, calcium carbonate, silicon dioxide, adopt the method for measuring the content of calcium hydroxide in the sample of the embodiment of the present invention, its steps are as follows:

[0051] (1) Preparation mixture: take by weighing 15.0g analytically pure calcium hydroxide, 3.0g analytically pure calcium oxide, 1.0g analytically pure calcium carbonate, 1.0 gram of silicon dioxide, a total of 20.0g (wherein the calcium hydroxide content is 75%), Accurate to ±0.01g, grind evenly with agate mortar;

[0052] (2) Dry the mixture in (1) in an oven at 105°C-110°C to a constant weight for 2 hours, take it out after drying, place it in a desiccator, and cool it down 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°C, fully dissolve the sample to volume with secondary reag...

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Abstract

The invention discloses a method for determining content of calcium hydroxide in lime. The method includes that according to a law that calcium oxide generates calcium hydroxide in water and a part, dissolved in water, of calcium hydroxide is completely electrolyzed to be hydroxyl ions and calcium ions, mass of insoluble substance in a sample is obtained by a filter weighing method by adopting molar weight of the hydroxyl ions in a total alkalinity titration sample solution, and the operation process is simple and convenient; content of calcium hydroxide in lime can be obtained accurately by utilizing equation calculating according to a sum of mass of calcium hydroxide and calcium oxide in the sample solution and molar weight of the hydroxyl ions in the sample solution, and effective utilization rate of lime can be increased.

Description

technical field [0001] The invention relates to the fields of lime treatment and lime softening in reclaimed water or raw water, in particular to a method for determining calcium hydroxide content in lime. Background technique [0002] The traditional pretreatment of reclaimed water or raw water is to use lime treatment to remove the carbonate hardness. In the process of treatment, calcium hydroxide is mainly used; high-purity calcium hydroxide (slaked lime) should be added to the pretreatment ). However, there are usually impurities in slaked lime, and the main component of impurities is calcium oxide. Calcium oxide dissolves in water and releases a large amount of heat, which reduces the solubility of calcium hydroxide in lime and blocks the pipeline of the dosing system. Therefore, it is very important to determine the content of calcium hydroxide in lime. [0003] Calcium oxide meets water to generate calcium hydroxide. Calcium hydroxide is a binary strong base, and al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N5/00G01N31/16
Inventor 杨圣超邱晓涛潘好伟白春会赵举李国斌张涛
Owner STATE GRID CORP OF CHINA
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