CN105004624A - Method for measuring content of calcium oxide in lime - Google Patents
Method for measuring content of calcium oxide in lime Download PDFInfo
- Publication number
- CN105004624A CN105004624A CN201510374162.6A CN201510374162A CN105004624A CN 105004624 A CN105004624 A CN 105004624A CN 201510374162 A CN201510374162 A CN 201510374162A CN 105004624 A CN105004624 A CN 105004624A
- Authority
- CN
- China
- Prior art keywords
- sample
- calcium oxide
- calcium
- quality
- content
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
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
The present invention relates to the modified field of Industrial Waste Water in Coal-fired Power Plant processing unit mud, be specifically related to the method measuring calcium oxide content in lime.
Background technology
Industrial Waste Water in Coal-fired Power Plant advanced treatment unit can produce a large amount of mud in normal course of operation, and the metallic ion contained in mud need carry out landfill or take other safety practices after stabilization processes; The modified technology of calcium oxide (unslaked lime) mud is widely used in recent years, mainly utilize calcium oxide water-soluble generation calcium hydroxide and the principle of releasing a large amount of heats, the partial ionization that calcium hydroxide dissolves in water generates the pH value of the adjustable mud of hydroxide ion, the heat produced can kill the microorganisms such as the bacterium of mud, makes mud obtain mummification simultaneously.And calcium oxide meets water or the very easily rotten calcium hydroxide that generates of humidity, time serious, cause unslaked lime can not use completely, therefore, extremely important to the detection of calcium oxide content in lime.
Calcium oxide is met water and is generated calcium hydroxide, and calcium hydroxide is binary highly basic, and the part of dissolving in water all ionizes as calcium ion and hydroxide ion, and its ionization reaction equation is:
Ca(OH)
2＝Ca
2++2OH
-
CaO+H
2O＝Ca(OH)
2＝Ca
2++2OH
-
In correlation technique, the assay method of calcium oxide content adopts hydroxyl or calcium ion concentration in working sample, calculates the content of calcium oxide.
But inventor finds, these assay methods be all survey lime dissolve after calcium ion or hydroxide ion, can not the calcium oxide content that obtains of district office be the content of original unslaked lime in sample, or the content of calcium hydroxide in raw sample, obtain testing result all higher.
Summary of the invention
The object of the invention is to solve the problem and a kind of method that calcium oxide content detects is provided, can the content of calcium oxide in Accurate Determining lime.
For solving the problems of the technologies described above, the technical scheme that the embodiment of the present invention adopts is, measure the method for calcium oxide content in lime, get the sample of drying constant weight and be made into 2 parts of aqueous solution, carry out the mensuration of full basicity titration and insolubles content respectively, according to these two equations of quality sum of calcium hydroxide and calcium oxide in molal quantity hydroxy in the sample solution that full basicity titration calculates and sample, calculate the content of calcium oxide.
Wherein, sample is placed in the baking oven of 105 DEG C ~ 110 DEG C, dries constant weight, take out after drying and be positioned in exsiccator, naturally cool to room temperature.
Concrete, the sample got after above-mentioned drying constant weight is dissolved in volumetric flask at T DEG C, with second class grade chemical water, sample is fully dissolved constant volume; Get 100mL solution and carry out full basicity titration, the molal quantity of whole hydroxide ion in calculation sample solution.
Concrete, the sample got after above-mentioned drying constant weight is dissolved in volumetric flask at T DEG C, with second class grade chemical water, sample is fully dissolved constant volume; Adopt the filtering solution of quantitative filter paper at a slow speed after drying constant weight; Filter paper after filtering is carried out oven dry constant weight, calculates the quality of insolubles, draw the quality sum of calcium oxide and calcium hydroxide in sample.
Concrete, according to equation a+b=m (1),
calculate the quality of calcium oxide, wherein:
A---the quality of calcium oxide in sample, g;
B---the quality of calcium hydroxide in sample, g;
M---the quality sum of calcium oxide and calcium hydroxide in sample, g;
N---the molar weight of whole hydroxide ion in sample solution, mol;
56---the molal weight of calcium oxide, g/mol;
74---the molal weight of calcium hydroxide, g/mol.
As preferably, in sample, the massfraction of calcium oxide is according to formula
calculate, wherein:
A---the quality of calcium oxide in sample, g;
The gross mass of M---sample, g.
Further, above-mentioned quality of weighing all is accurate to ± 0.0002g.
Wherein, described full basicity titration method adopts the method specified in " mensuration of industrial circulating cooling water total alkali and phenolphthalein alkalinity " GB/T15451-2006.
Beneficial effect of the present invention, the present invention is according to calcium hydroxide solubleness at a certain temperature, and dissolved completely by the lime sample of drying constant weight, the full basicity of titration sample solution obtains the molar weight of hydroxide ion; Separately get the complete dissolution filter of lime sample that equivalent dries constant weight, obtain the quality of insolubles; According to equation, can accurately calculate calcium oxide and calcium hydroxide in lime sample quality and, more accurately can calculate the quality of calcium oxide according to the molar weight hydroxy that the full basicity of titration obtains, thus obtain the content of effective calcium oxide in lime; Operating process is simple, and the calcium oxide content obtained is accurate, improves the effective rate of utilization of lime.
Embodiment
Embodiment one
Adopt the method for the embodiment of the present invention to measure the content of calcium oxide in the modified lime of certain thermal power plant's mud, its step is as follows:
(1) sample thief 10.0g, dries constant weight 2 hours in 105 DEG C of-110 DEG C of baking ovens, takes out and is positioned in exsiccator, naturally cool to room temperature after drying;
(2) take above-mentioned sample 0.5000g after drying, accurately extremely ± 0.0002g, is dissolved in the volumetric flask of 1L by this sample, with second class grade chemical water, sample is fully dissolved rear constant volume at 25 DEG C;
(3) the water sample 100mL getting above-mentioned constant volume carries out full basicity titration, the molal quantity of whole hydroxide ion in calculation sample solution;
(4) constant weight will be dried 2 hours in 105 DEG C of-110 DEG C of baking ovens by quantitative filter paper at a slow speed, and take out after drying and be positioned in exsiccator, naturally cool to room temperature, claim its exact mass;
(5) separately take above-mentioned sample 0.5000g after drying, accurately extremely ± 0.0002g, is dissolved in the volumetric flask of 1L by this sample, with second class grade chemical water, sample is fully dissolved rear constant volume at 25 DEG C; Use the filter paper in (4) to filter sample, insolubles is filtered on filter paper completely;
(6) filter paper after filtration is placed in 105 DEG C of-110 DEG C of baking ovens and dries constant weight 2 hours, be positioned over after naturally cooling to room temperature in exsiccator, take filter paper and add insolubles quality, calculate insolubles quality, draw the quality sum of calcium oxide and calcium hydroxide;
(7) calculating calcium oxide content in described sample according to equation (1) and (2) is 60.2%.
Further, adopt the method measuring calcium oxide content in correlation technique to measure the content of calcium oxide in the modified lime of certain thermal power plant's mud, its step is as follows:
(1) the thin sample 1.0000g of grinding is accurately taken, accurately extremely ± 0.0002g, be placed in beaker, add and just boil boiled-out water and be about 300mL, stir evenly and be all transferred in 1000mL volumetric flask afterwards, bottle is jumped a queue and frequently shakes, cool after about 20min, then add and newly boil cold distilled water and be settled to scale;
(2) solution in volumetric flask is mixed, rapidly solution in volumetric flask is filtered, be collected in after discarding initial 100mL filtrate in new beaker;
(3) drawing 50mL filtrate and inject conical flask, take phenolphthalein as indicator, is titrated to red disappearance and within 30 seconds, no longer occurs being terminal with 0.1mol/L hydrochloric acid standard solution; Calculate calcium oxide content in sample and count 70.5% with calcium oxide massfraction.
From relatively above-mentioned, the measured value that the measuring method that the calcium oxide content that the embodiment of the present invention is surveyed is less than correlation technique obtains, the result that the embodiment of the present invention measures is more accurate.
Embodiment two
Prepare the potpourri of known calcium oxide content, comprise the impurity such as calcium hydroxide, calcium carbonate, silicon dioxide, adopt the content of calcium oxide in the method working sample of the embodiment of the present invention, its step is as follows:
(1) preparating mixture: take 6.0g and analyze carbonate-free lime, 3.0g analyzes pure cerium hydroxide calcium, and 0.5g analyzes pure calcium carbonate, 0.5 gram of silicon dioxide, amount to 10.0g (wherein calcium oxide content is 60%), be accurate to ± 0.01g, even with agate mortar grinding;
(2) potpourri in (1) is placed in 105 DEG C of-110 DEG C of baking ovens and dries constant weight 2 hours, take out after drying and be positioned in exsiccator, naturally cool to room temperature;
(3) take the sample 0.5000g after drying in (2), accurately extremely ± 0.0002g, is dissolved in the volumetric flask of 1L by this sample, with second class grade chemical water, sample is fully dissolved constant volume at 25 DEG C;
(4) solution got in 100mL (3) carries out full basicity titration, whole molal quantity hydroxy in calculation sample solution;
(5) constant weight will be dried 2 hours in 105 DEG C of-110 DEG C of baking ovens by quantitative filter paper at a slow speed, and take out after drying and be positioned in exsiccator, naturally cool to room temperature, claim its exact mass;
(6) 0.5000g sample is separately taken, accurately extremely ± 0.0002g, is dissolved in this sample in 1L volumetric flask, with second class grade chemical water, sample is fully dissolved rear constant volume at 25 DEG C, use the filter paper in (5) to filter sample, insolubles is filled on filter paper completely;
(7) filter paper after filtration is placed in 105 DEG C of-110 DEG C of baking ovens and dries constant weight 2 hours, be positioned in exsiccator and naturally cool to room temperature, take filter paper and add insolubles quality, calculate insolubles quality, draw the quality sum of calcium oxide and calcium hydroxide; Calculating calcium oxide content in potpourri according to equation (1) and (2) is 61.2%, in the lime that the known embodiment of the present invention measures calcium oxide content and actual content very close, the methods and results of the embodiment of the present invention is accurate.
Embodiment three
Prepare the potpourri of known calcium oxide content, comprise the impurity such as calcium hydroxide, calcium carbonate, silicon dioxide, adopt the content of calcium oxide in the method working sample of the embodiment of the present invention, its step is as follows:
(1) preparating mixture: take 14.0g and analyze carbonate-free lime, 4.0g analyzes pure cerium hydroxide calcium, and 1.0g analyzes pure calcium carbonate, 1.0 grams of silicon dioxide, amount to 20.0g (wherein calcium oxide content is 70%), be accurate to ± 0.01g, even with agate mortar grinding;
(2) potpourri in (1) is placed in 105 DEG C of-110 DEG C of baking ovens and dries constant weight 2 hours, take out after drying and be positioned in exsiccator, naturally cool to room temperature;
(3) take the sample 0.5000g after drying in (2), accurately extremely ± 0.0002g, is dissolved in the volumetric flask of 1L by this sample, with second class grade chemical water, sample is fully dissolved constant volume at 25 DEG C;
(4) solution got in 100mL (3) carries out full basicity titration, whole molal quantity hydroxy in calculation sample solution;
(5) constant weight will be dried 2 hours in 105 DEG C of-110 DEG C of baking ovens by quantitative filter paper at a slow speed, and take out after drying and be positioned in exsiccator, naturally cool to room temperature, claim its exact mass;
(6) 0.5000g sample is separately taken, accurately extremely ± 0.0002g, is dissolved in this sample in 1L volumetric flask, with second class grade chemical water, sample is fully dissolved rear constant volume at 25 DEG C, use the filter paper in (5) to filter sample, insolubles is filled on filter paper completely;
(7) filter paper after filtration is placed in 105 DEG C of-110 DEG C of baking ovens and dries constant weight 2 hours, be positioned in exsiccator and naturally cool to room temperature, take filter paper and add insolubles quality, calculate insolubles quality, draw the quality sum of calcium oxide and calcium hydroxide; Calculating calcium oxide content in potpourri according to equation (1) and (2) is 71.3%, in the lime that the known embodiment of the present invention measures calcium oxide content and actual content very close, the methods and results of the embodiment of the present invention is accurate.
Last it is noted that above embodiment is only in order to illustrate the technical scheme of the invention, be not intended to limit; Although be described in detail the invention with reference to previous embodiment, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of each embodiment technical scheme of the invention.
Claims (8)
1. measure the method for calcium oxide content in lime, it is characterized in that: get the sample of drying constant weight and be made into 2 parts of aqueous solution, carry out the mensuration of full basicity titration and insolubles content respectively, according to these two equations of quality sum of calcium hydroxide and calcium oxide in the molal quantity of hydroxide ion in the sample solution that full basicity titration calculates and sample, calculate the content of calcium oxide.
2. the method for calcium oxide content in mensuration lime according to claim 1, is characterized in that: baking oven sample being placed in 105 DEG C ~ 110 DEG C, dries constant weight, takes out and is positioned in exsiccator, naturally cool to room temperature after drying.
3. the method for calcium oxide content in mensuration lime according to claim 1, is characterized in that: the sample got after drying constant weight is dissolved in volumetric flask at T DEG C, with second class grade chemical water, sample is fully dissolved constant volume; Get 100mL solution and carry out full basicity titration, the molal quantity of whole hydroxide ion in calculation sample solution.
4. the method for calcium oxide content in mensuration lime according to claim 1, is characterized in that: the sample got after drying constant weight is dissolved in volumetric flask at T DEG C, with second class grade chemical water, sample is fully dissolved constant volume; Adopt the filtering solution of quantitative filter paper at a slow speed after drying constant weight; Filter paper after filtering is carried out oven dry constant weight, calculates the quality of insolubles, the quality sum of calcium oxide and calcium hydroxide in calculation sample.
5. the method for calcium oxide content in mensuration lime according to claim 1, is characterized in that: according to equation a+b=m and
calculate the quality of calcium oxide, wherein:
A---the quality of calcium oxide in sample, g;
B---the quality of calcium hydroxide in sample, g;
M---the quality sum of calcium oxide and calcium hydroxide in sample, g;
N---the molar weight of whole hydroxide ion in sample solution, mol;
56---the molal weight of calcium oxide, g/mol;
74---the molal weight of calcium hydroxide, g/mol.
6. the method for calcium oxide content in mensuration lime according to claim 5, is characterized in that: in sample, the massfraction ω of calcium oxide is according to formula
calculate, wherein:
A---the quality of calcium oxide in sample, g;
The gross mass of M---sample, g.
7. the method for calcium oxide content in mensuration lime according to claim 1, is characterized in that: quality of weighing is accurate to ± 0.0002g.
8. the method for calcium oxide content in the mensuration lime according to claim 1 or 3, is characterized in that: described full basicity titration method adopts the method specified in " mensuration of industrial circulating cooling water total alkali and phenolphthalein alkalinity " GB/T 15451-2006.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510374162.6A CN105004624A (en) | 2015-06-30 | 2015-06-30 | Method for measuring content of calcium oxide in lime |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510374162.6A CN105004624A (en) | 2015-06-30 | 2015-06-30 | Method for measuring content of calcium oxide in lime |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105004624A true CN105004624A (en) | 2015-10-28 |
Family
ID=54377378
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510374162.6A Pending CN105004624A (en) | 2015-06-30 | 2015-06-30 | Method for measuring content of calcium oxide in lime |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105004624A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115791499A (en) * | 2022-09-29 | 2023-03-14 | 无锡普天铁心股份有限公司 | Method for determining hydration rate of magnesium oxide for oriented silicon steel |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101109738A (en) * | 2007-08-24 | 2008-01-23 | 中电投远达环保工程有限公司 | Method for analyzing quicklime composition |
| CN101710110A (en) * | 2009-12-17 | 2010-05-19 | 北京博奇电力科技有限公司 | Method for determining contents of active CaO and MgO in limestone for wet-method flue gas desulphurization |
| CN104090066A (en) * | 2014-07-16 | 2014-10-08 | 山东石大胜华化工集团股份有限公司 | Device and method for measuring CaO content of quicklime |
-
2015
- 2015-06-30 CN CN201510374162.6A patent/CN105004624A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101109738A (en) * | 2007-08-24 | 2008-01-23 | 中电投远达环保工程有限公司 | Method for analyzing quicklime composition |
| CN101710110A (en) * | 2009-12-17 | 2010-05-19 | 北京博奇电力科技有限公司 | Method for determining contents of active CaO and MgO in limestone for wet-method flue gas desulphurization |
| CN104090066A (en) * | 2014-07-16 | 2014-10-08 | 山东石大胜华化工集团股份有限公司 | Device and method for measuring CaO content of quicklime |
Non-Patent Citations (2)
| Title |
|---|
| 中华人民共和国国家质量监督检验检疫总局等: "工业循环冷却水总碱及酚酞碱度的测定", 《GB/T 15451-2006》 * |
| 百度 作业帮: "如何检测氢氧化钙中氧化钙含量", 《HTTP://WWW.ZYBANG.COM/QUESTION/E0E931F5BC62E78CFD5E82F452ADDD82.HTML》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115791499A (en) * | 2022-09-29 | 2023-03-14 | 无锡普天铁心股份有限公司 | Method for determining hydration rate of magnesium oxide for oriented silicon steel |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Coumes et al. | Combined effects of lithium and borate ions on the hydration of calcium sulfoaluminate cement | |
| CN103543055A (en) | Pretreatment method for heavy metal element detection in solid sample and application of pretreatment method | |
| CN104977385A (en) | Method for continuous determination of calcium oxide and magnesium oxide content of limestone and dolomite | |
| CN109320111A (en) | A kind of method of titanium pigment and fluorine in stabilization/solidification ardealite | |
| TWI406820B (en) | Treatment of chlorine - containing wastewater | |
| CN102564890B (en) | Method for detecting content of sulfur trioxide in gypsum | |
| CN100587477C (en) | Method for identification of sodium carbonate and sodium bicarbonate solution | |
| CN105004624A (en) | Method for measuring content of calcium oxide in lime | |
| CN102507279B (en) | Sample pretreatment method for determining content of chloride ion and sulfate radical in limestone solid | |
| CN104297236A (en) | Method for detecting content of active calcium oxide and non-active calcium oxide in lime | |
| CN105110487A (en) | Method for removing and recovering plutonium in acid wastewater with microorganisms | |
| Zhou et al. | Isopiestic measurement of the osmotic and activity coefficients for the NaOH-NaAl (OH) 4-H2O system at 313.2 K | |
| Wellington et al. | Impact of Bayer process liquor impurities on causticization | |
| CN104048963B (en) | The method of testing of sulfate dihydrate calcium content in desulfurated plaster | |
| CN104897507B (en) | The method for determining calcium hydroxide content in lime | |
| JP3755039B2 (en) | Method for measuring trace elements in a sample, method for suppressing coprecipitation of trace elements and fluoride | |
| RU2528692C2 (en) | Method of extracting rare-earth elements from wet-process phosphoric acid when processing khibiny apatite concentrates | |
| CN104316431A (en) | Method for detecting content of diatomaceous earth in diatom ooze wall material | |
| Swanepoel et al. | Complete sulphate removal from neutralised acidic mine drainage with barium carbonate | |
| CN103105394A (en) | Determination method of content of total phosphate in iron ore | |
| CN103512823B (en) | The detection method of barium content in a kind of nonstandard barium stearate | |
| CN105399126A (en) | Method used for recovery preparation of aluminum potassium sulfate from activated clay production waste water | |
| BR112021005435A2 (en) | method for determining phosphate concentration | |
| JP6638602B2 (en) | Method for producing gypsum and method for producing cement composition | |
| JP4696017B2 (en) | Treatment method for boron-containing wastewater |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20151028 |