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Method for determining the occurrence state of mercury in desulfurization by-products

A technology of desulfurization by-products and occurrence state, which is applied in the field of determining the occurrence state of mercury in desulfurization by-products, and can solve problems such as being unsuitable for desulfurization by-products.

Inactive Publication Date: 2015-12-02
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The occurrence state of mercury is an important factor affecting the release, migration, and transformation of mercury in desulfurization by-products. Tessier, BCR and their improved methods are used at home and abroad to extract heavy metals in different forms in soil and sediment, but they are not suitable for desulfurization by-products.

Method used

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  • Method for determining the occurrence state of mercury in desulfurization by-products
  • Method for determining the occurrence state of mercury in desulfurization by-products
  • Method for determining the occurrence state of mercury in desulfurization by-products

Examples

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Embodiment 1

[0027] Select a semi-dry desulfurization ash sample from a power plant in Zhejiang, divide it into three equal parts, 5g each, and mark them as SampleA-1, SampleA-2, and SampleA-3. At first adopt atomic fluorescence spectrophotometry to measure the content of total mercury in the sample, then use the method in the present invention to measure respectively the content of mercury in each extraction step in three groups of samples to be tested, concrete determination steps are:

[0028] (1) Take the sample to be tested that has been ground through a 60-mesh sieve, add deionized water, stir at a constant temperature of 30°C, shake for 30 minutes, let it stand for 8 hours, centrifuge at 4000rpm for 10 minutes, take the supernatant after centrifugation and filter it to be tested, the residue dry. This step extracts water-soluble mercury, mainly including HgCl 2 , HgNO 3 , HgSO 4 etc., liquid-solid ratio 1:5g / ml (liquid-solid ratio will affect the extraction ratio of mercury, with...

Embodiment 2

[0056] Select a wet desulfurization gypsum sample from a power plant in Zhejiang, divide it into three equal parts, each 5g, and mark it as SampleB-1, SampleB-2, and SampleB-3. At first adopt atomic fluorescence spectrophotometry to measure the content of total mercury in the sample, then use the method in the present invention to measure respectively the content of mercury in each extraction step in three groups of samples to be tested, concrete determination steps are:

[0057] (1) Take the sample to be tested that has been ground through an 80-mesh sieve, add deionized water, shake at a constant temperature of 20°C for 30 minutes after stirring, let stand for 8 hours, centrifuge at 4500rpm for 15 minutes, take the supernatant after centrifugation, filter it for testing, and dry the residue . This step extracts water-soluble mercury, mainly including HgCl 2 , HgNO 3 , HgSO 4 etc., the liquid-solid ratio is 1:10g / ml;

[0058] (2) Freeze-dry the residue from step (1) to re...

Embodiment 3

[0066] Select a wet desulfurization gypsum sample from a power plant in Zhejiang, divide it into three equal parts, each 5g, and mark it as SampleC-1, SampleC-2, and SampleC-3. At first adopt atomic fluorescence spectrophotometry to measure the content of total mercury in the sample, then use the method in the present invention to measure respectively the content of mercury in each extraction step in three groups of samples to be tested, concrete determination steps are:

[0067] (1) Take the sample to be tested that has been ground through a 70-mesh sieve, add deionized water, stir at a constant temperature of 25°C, shake for 30 minutes, let it stand for 8 hours, centrifuge at 5000rpm for 20 minutes, take the supernatant after centrifugation and filter it to be tested, the residue dry. This step extracts water-soluble mercury, mainly including HgCl 2 , HgNO 3 , HgSO 4 etc., the liquid-solid ratio is 1:6g / ml;

[0068] (2) Freeze-dry the residue from step (1) to remove mois...

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Abstract

The invention belongs to the technical field of environmental protection chemical technology, and specifically relates to a method for determining an occurrence state of mercury in a desulfurization by-product. The invention discloses a method for analyzing the occurrence state of mercury in the desulfurization by-product, wherein the method comprises: carrying out grinding screening on a sample requiring detection, sequentially adding deionized water, a CH3COOH and HCl mixing solution, a H2O2 solution, and an aqua regia (a ratio of HCl to HNO3 is 3:1) solution, and respectively determining water soluble state mercury content, weak acid extractable state mercury content, oxidable state mercury content and residual state mercury content in the desulfurization by-product. According to the method, the high extraction proportion of mercury in the desulfurization by-product is achieved, mercury with different forms can be progressively and accurately extracted, and theoretical basis can be provided for environmental risk assessment of the comprehensive desulfurization by-product utilization process.

Description

technical field [0001] The invention belongs to the technical field of environmental protection chemical industry, and in particular relates to a method for measuring the occurrence state of mercury in desulfurization by-products. Background technique [0002] In recent years, the problem of atmospheric mercury pollution has increasingly become a global environmental problem that the international community has focused on, and the call for controlling mercury pollution has become increasingly louder. In human activities, coal combustion is one of the main causes of mercury emissions. According to statistics, from 1995 to 2003, the mercury emitted by coal-fired flue gas in my country increased from 202t to 257t, and by 2010 it reached 580t. Therefore, the mercury emission produced by coal burning is very high, leading to the increasingly serious problem of domestic mercury pollution. [0003] In order to reduce the cost of mercury removal, it has become one of the main deve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/34
Inventor 孙明洋徐新华胡运俊侯佳艾楼子墨
Owner ZHEJIANG UNIV
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