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Analysis method for air pollution by pyrolysis of raw materials in sand casting

An analysis method, sand casting technology, applied in the direction of material separation, analysis of materials, measuring devices, etc., can solve the problem of incomplete and accurate results

Inactive Publication Date: 2013-01-16
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, most of the analysis of air pollution from pyrolysis of raw materials in sand casting in my country adopts the technology of sampling, sample processing and analysis. This technology inevitably causes the problem of sample loss and dilution, resulting in incomplete and accurate results.

Method used

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  • Analysis method for air pollution by pyrolysis of raw materials in sand casting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Mix coal powder (manufactured by Mingxinyuan Trading Co., Ltd.), phenolic resin binder (manufactured by Hebei Hongye Chemical Co., Ltd.), and silica sand (manufactured by Lingshou County Huayi Mineral Products Processing Factory) in a ratio of 5:1:5 Making a molding core, grinding and crushing the prepared molding core to a particle diameter of 0.1-1 mm. The sample wrapped in alloy foil was rapidly heated to 1200°C within 0.2s by using a JHP-22 Curie point thermal cracker, and the cracking time was 1s. Then the gas chromatograph directly connected with the pyrolyzer was used to separate the air pollutants produced by pyrolysis, and then identified and analyzed by mass spectrometry and flame ionization detector. The analysis results are shown in Table 1.

[0017] Among them, the operating conditions of each instrument and equipment are as follows;

[0018] Pyrolyzer: use high-purity He as the carrier gas, and heat up to the reaction temperature at a rate of 10°C Pms.

...

Embodiment 2

[0025] Mix coal powder (manufactured by Mingxinyuan Trading Co., Ltd.), animal glue adhesive (manufactured by Beijing Mingcai Adhesive Co., Ltd.), and silica sand (manufactured by Lingshou County Huayi Mineral Products Processing Factory) in a ratio of 5:1:5 After mixing, a molding core is made, and the prepared core is ground and crushed until the particle diameter is 0.1-1 mm. The sample wrapped in alloy foil was rapidly heated to 900°C within 0.1s by using a JHP-22 Curie point thermal cracker, and the cracking time was 5s. Then the gas chromatograph directly connected with the pyrolyzer was used to separate the air pollutants produced by pyrolysis, and then identified and analyzed by mass spectrometry and flame ionization detector. The analysis results are shown in Table 2. The operating conditions of each instrument are the same as in Example 1.

[0026] Table 2. The measured emission factors and content

[0027]

Embodiment 3

[0029] Coal powder (manufactured by Mingxinyuan Trading Co., Ltd.), naphthalene-free phenolic resin binder (phenolic resin produced by Wuxi Xinming Chemical Co., Ltd.), and silica sand (manufactured by Lingshou County Huayi Mineral Products Processing Plant) were mixed at a ratio of 5:1. : 5 to make a molding core after mixing, and grind and crush the prepared core until the particle diameter is 0.1 to 1 mm. The sample wrapped in alloy foil was rapidly heated to 1000°C within 0.2s by using a JHP-22 Curie point thermal cracker, and the cracking time was 3s. Then the gas chromatograph directly connected with the pyrolyzer was used to separate the air pollutants produced by pyrolysis, and then identified and analyzed by mass spectrometry and flame ionization detector. The analysis results are shown in Table 3. The operating conditions of the instrument are the same as in Example 1.

[0030] Table 3. The measured emission factors and content

[0031]

[0032]

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Abstract

The invention relates to an analysis method for air pollution by pyrolysis of raw materials in sand casting. The analysis method includes mixing pulverized coal, kernel adhesive and silica sand according to a proportion of manufacturing a kernel at a casting factory to manufacture a kernel, grinding the kernel, heating to 900-1200 DEG C within 0.1-0.2 seconds, and cracking. The analysis method simulates pyrolysis of the raw materials in casting process and analyzes type and quantity of air pollutant. By the technology of simulating and analyzing air pollution by pyrolysis of the raw materials in sand casting process, pyrolysis of the raw materials in casting process can be simulated accurately, a list of air pollutant of the raw materials is established quickly and reliably, sample loss or dilution caused by sampling is avoided, and theoretical basis and instruction are expected to be provided for research and improvement of novel raw materials and selection of proper novel cleaning raw materials for casting enterprises.

Description

technical field [0001] The invention relates to the field of chemical testing, in particular to an analysis method for pyrolysis air pollution of raw materials in sand casting. Background technique [0002] Sand casting is the most important casting method in the world. In my country and the world, the castings produced by sand casting account for 70% to 80% of the total casting production. However, the air pollution problem of sand casting is very serious, especially the dangerous air pollutants emitted by foundry enterprises pose a serious threat to human beings and the environment. [0003] The hazardous substances produced in the sand casting process mainly come from the cracking of raw materials (such as coal powder, binder, etc.) for making sand molds and cores during the casting process. When the melted metal is poured into a sand mold, coal powder and adhesives are pyrolyzed under the condition of high temperature and lack of oxygen, resulting in a large amount of h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02G01N30/06
Inventor 王玉珏孙新升张海凤于艳卿
Owner TSINGHUA UNIV
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