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Digestion and determination method of heavy metals in waste dust-collecting bag

A determination method and technology for heavy metals, applied in the field of environmental engineering, can solve the problems of groundwater, secondary pollution of soil, harm to human health, recycling and utilization of heavy metal pollution characteristics and no relevant reports on resource utilization.

Inactive Publication Date: 2012-01-11
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If it enters the environment directly without treatment, the waste dust bag will be soaked, eroded and leaked by rainwater, which will easily cause secondary pollution to groundwater, soil, etc., and endanger human health.
[0003] Research on the pollution characteristics of heavy metals in waste dust-removing cloth bags and their recycling and recycling have not been reported in China.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Under normal temperature and pressure, weigh 0.3g of waste dust-removing cloth bags from the sintering workshop of the lead-zinc smelter, which was dried at 105°C for 24 hours, and place them in a FR21 type all-polytetrafluoroethylene sealed pressurized digestion tank, and add 7ml of HNO 3 (GR), 1mlH 2 o 2 (30%, GR) and 1mlHF (GR); 10mlHNO 3 (GR), 3mlH 2 o 2 (30%, GR) and 3ml HF (GR), tighten the lid of the digestion tank, shake the solution several times, and let it stand overnight. After microwave digestion, the water bath (100°C) was used to catch the acid for about 20 minutes, and the volume fraction was 2% HNO 3 Wash the sample dissolving cup 3 times with the medium, put them together in a 50ml volumetric flask for measurement, set the working parameters of the FAAS instrument, and measure the full amount of Cu, Zn, Pb, Cr, Ni, and Cd on the sample-digestion solution after full digestion. The experimental results are shown in Table 2 and Table 3.

[0028] T...

Embodiment 2

[0033] Under normal temperature and pressure, weigh 0.5g of waste dust-removing cloth bags from converters in iron and steel plants dried at 105°C for 24 hours and place them in FR21 all-polytetrafluoroethylene sealed pressurized digestion tanks, and add 10ml of HNO 3 (GR), 2 mlH 2 o 2 (30%, GR) and 2ml HF (GR), tighten the lid of the digestion tank, shake the solution several times, and let it stand overnight. After microwave digestion, the water bath (100°C) was used to catch the acid for about 20 minutes, and the volume fraction was 2% HNO 3 Wash the sample dissolving cup 3 times with the medium, combine them into a 50ml volumetric flask for testing, set the working parameters of the FAAS instrument, and perform Cu, Zn, Pb, Cr, Ni, Cd full determination. The experimental results are shown in Table 4 and Table 5.

[0034] Table 4 Microwave digestion test effect

[0035] serial number Types of waste dust bag Digestion effect 1 Converter waste ...

Embodiment 3

[0039] Under normal temperature and pressure, weigh 0.4g of waste dust-removing cloth bags from blast furnaces in iron and steel mills dried at 105°C for 24 hours and place them in FR21 all-polytetrafluoroethylene sealed pressurized digestion tanks, add 10ml of HNO3 (GR), 2 ml of H 2 o 2 (30%, GR) and 2ml HF (GR), tighten the lid of the digestion tank, shake the solution several times, and let it stand overnight. After microwave digestion, wash the acid in a water bath (100°C) for about 20 minutes, wash the sample cup three times with HNO3 medium with a volume fraction of 2%, and put it in a 50ml volumetric flask for measurement. Cu, Zn, Pb, Cr, Ni, and Cd were determined in full amount for the samples and the digestion solution of the national standard material of polluted soil. The experimental results are shown in Table 4 and Table 5.

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Abstract

The invention discloses a digestion and determination method of heavy metals in a waste dust-collecting bag, and relates to microwave digestion of the waste bags generated by iron and steel smelting and non-ferrous metal smelting (such as lead-zinc smelting and copper smelting). The method comprises the following steps: mixing the waste dust-collecting bag with a digestion acid system composed ofnitric acid, hydrogen peroxide and hydrofluoric acid in a polytetrafluoroethylene-sealed pressurized digestion tank at normal temperature, shaking up and keeping standing overnight; and performing the microwave digestion under certain conditions and then performing heavy metal determination. By adopting the method, the waste dust-collecting bag is made into a digestion solution, and flame atomic absorption spectroscopy (FAAS) is further adopted for determining the content of the heavy metals in the digestion solution.

Description

technical field [0001] The invention relates to the pretreatment of microwave digestion and the method of instrument measurement in the determination process of heavy metals in waste dust-removing cloth bags, especially to the digestion and determination of heavy metals in waste dust-removing cloth bags produced in iron and steel smelting and lead-zinc smelting industries, and belongs to environmental engineering field. Background technique [0002] The waste dust bag mainly comes from the bag dust collector in the waste gas treatment process of industries such as iron and steel, non-ferrous metal smelting, thermal power plants, cement plants, steam boilers and other industries that generate large amounts of flue gas. With the increase of the service life of the bag filter, problems such as aging, damage, burning and blockage of the bag have appeared, and the environmental pollution of the waste filter bag has arisen. Common cloth bags are mainly divided into chemical fiber...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N1/44
Inventor 宁寻安王江辉周云刘敬勇杨佐毅李磊英柱梁秀娟
Owner GUANGDONG UNIV OF TECH
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