Detection method of ammonia content in coal ash

A detection method, fly ash technology, applied in the detection field, can solve problems such as poor applicability, and achieve the effect of wide application range, low requirements for equipment and maintenance, and accurate detection

Inactive Publication Date: 2018-12-21
TIANJIN BUILDING MATERIAL PROD QUALITY SUPERVISION & INSPECTION CENT +2
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Problems solved by technology

Combined with the current distribution range of the mass fraction of ammonia content in fly ash, the mass fraction of ammonia content in fly ash is controlled at two levels of 0.02% and 0.10%, and the mass fraction of ammonia content in fly ash is lower than 0.02% (that is, the ammonia content is lower than 200mg / kg), the applicability of the detection method of ammonia content in fly ash by distillation titration is not strong

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  • Detection method of ammonia content in coal ash
  • Detection method of ammonia content in coal ash
  • Detection method of ammonia content in coal ash

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Embodiment

[0035] Take not less than 3 kg of fly ash powder with representative uniformity and denitrification treatment as the fly ash sample, divide the sample into about 100 g by the quartering method, put them into sample bags respectively, and mark the numbers (sample See Table 1), measured after storage in a laboratory desiccator for 24 hours.

[0036]The detection method of ammonia content in fly ash-distillation spectrophotometry comprises the following steps:

[0037] (1) Pretreatment of samples: Weigh about 3g of each sample (see Table 1 for the specific weighing amount), accurate to 0.0001g, put them into 400mL beakers respectively, add 20mL distilled water and 10mL volume ratio 1:1 Dissolve with concentrated hydrochloric acid, stir evenly, filter after standing for 20min, collect the filtrates into 500mL glass stills respectively, and control the total volume of distillate to 200mL for distillation.

[0038] (2) Distillation absorption treatment (according to figure 1 As sh...

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Abstract

The invention provides a detection method-distillation spectrophotometry of ammonia content in coal ash. The method comprises sample pretreatment, distillation absorbing treatment, indophenol blue spectrophotometry development measurement, ammonia concentration computation in a sample solution and the computation of ammonia content in the coal ash. Through the detection method provided by the invention, the influences of many coal ash insoluble matters and large impurity ion interference when the absorption photometry is used for detection are sufficiently considered; the distillation absorbing treatment is performed after adopting acid-soluble pretreatment, and the accuracy of the detection result is improved, so that the data has comparability and repeatability. The detection method provided by the invention has low requirements on sample environment, instrument equipment and maintenance, is large in applicable range, precise in detection and easy to implement; the detection method has good social benefit, environment and economic benefit after being promoted.

Description

technical field [0001] The invention relates to a detection method, in particular to a detection method of ammonia content in fly ash-distillation spectrophotometry. Background technique [0002] In recent years, with the support of my country's solid waste resource utilization policy, the traditional technology of resource utilization of fly ash discharged from power plants as cement-based cementitious materials, fly ash masonry, and construction engineering filling has formed a large scale. It is widely used in the field of construction and building materials. Fly ash has become one of the indispensable materials for the preparation of building materials in the development of my country's construction projects. At present, laws and regulations such as the "Environmental Protection Tax Law" are conscientiously implemented. Solid waste fly ash will be levied an environmental protection discharge tax if it is not processed and discharged. The best choice for resource utilizati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31
CPCG01N21/31
Inventor 李赵相王冬梅白锡庆赵磊刘凤东杨倩毛志毅刘彤房跃李桂燕
Owner TIANJIN BUILDING MATERIAL PROD QUALITY SUPERVISION & INSPECTION CENT
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