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Method for Determination of Calcium Hydroxide Content in Lime

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

Active Publication Date: 2017-11-14
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 measuring calcium hydroxide content in lime, according to which calcium hydroxide is generated in water by calcium oxide, and the part of calcium hydroxide dissolved in water is completely ionized into hydroxide ions and calcium ions; the sample is titrated by full alkalinity The molar weight of hydroxide ions in the solution can be obtained by filtering and weighing method to obtain the amount of insoluble matter in the sample, and the operation process is simple; Calcium hydroxide content in lime can be accurately obtained by using equation calculation, which can improve the effective utilization rate of lime.

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 Patents(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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