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Method for treating acid chromium-contained polluted waste water with molten iron residues as raw material

A treatment method, iron slag technology, applied in water/sludge/sewage treatment, flocculation/sedimentation water/sewage treatment, water pollutants, etc., can solve problems such as acidic chromium-containing pollution treatment methods, and achieve cost savings and density High, easy-to-operate effect

Inactive Publication Date: 2015-11-18
SHANGHAI MCC ENVIRONMENTAL ENG TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a treatment method for acidic chromium-containing polluted wastewater using molten iron slag as raw material, for solving the problems in the prior art in the treatment method of acidic chromium-containing polluted water

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  • Method for treating acid chromium-contained polluted waste water with molten iron residues as raw material
  • Method for treating acid chromium-contained polluted waste water with molten iron residues as raw material
  • Method for treating acid chromium-contained polluted waste water with molten iron residues as raw material

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Effect test

Embodiment 1

[0038] Typical iron slag mainly contains 10%-15% silicon dioxide (SiO 2 ), 3%-8% magnesium oxide (MgO), 30%-50% calcium oxide (CaO), 20-35% elemental iron (MFe), 10-15% ferrous oxide (FeO), and A small amount of P 2 o 5 , Fe 2 o 3 and sulfide etc. The concrete composition of the molten iron slag in embodiment 1 is as follows: 13% silicon dioxide (SiO 2 ), 6% of magnesium oxide (MgO), 41% of calcium oxide (CaO), 28% of elemental iron (MFe), 13% of ferrous oxide (FeO), and the content of heavy metals in molten iron slag meets the total cadmium <0.1mg / kg, total mercury<0.05mg / kg, total arsenic<5mg / kg, total lead<5mg / kg, total copper<5mg / kg, total nickel<5mg / kg, total zinc<5mg / kg, total manganese<100mg / kg kg, total cobalt<1mg / kg, total selenium<1mg / kg, total vanadium<1mg / kg, total antimony<0.10mg / kg, total thallium<0.10mg / kg, total chromium<10mg / kg (hexavalent chromium< 0.1mg / kg).

[0039] Sieve the iron slag to a certain fineness and add it directly to the acidic chromiu...

Embodiment 2

[0049] The concrete composition of the molten iron slag in embodiment 2 is as follows: 11% silicon dioxide (SiO 2 ), 4% magnesium oxide (MgO), 32% calcium oxide (CaO), 21% elemental iron (MFe), 15% ferrous oxide (FeO), and the heavy metal content of molten iron slag meets the total cadmium <0.1mg / kg, total mercury<0.05mg / kg, total arsenic<5mg / kg, total lead<5mg / kg, total copper<5mg / kg, total nickel<5mg / kg, total zinc<5mg / kg, total manganese<100mg / kg kg, total cobalt<1mg / kg, total selenium<1mg / kg, total vanadium<1mg / kg, total antimony<0.10mg / kg, total thallium<0.10mg / kg, total chromium<10mg / kg (hexavalent chromium< 0.1mg / kg).

[0050] After sieving iron slag to 5 mesh, it is directly added to the acidic chromium-containing polluted wastewater (the content of trivalent chromium is 20mg / L, the content of hexavalent chromium is 20mg / L, and the pH is 4.9). The adding method is automatic dosing machine to join. After the iron slag and the acidic chromium-containing contaminated ...

Embodiment 3

[0052] The concrete composition of the molten iron slag in embodiment 3 is as follows: 14% silicon dioxide (SiO 2 ), 8% magnesium oxide (MgO), 48% calcium oxide (CaO), 33% elemental iron (MFe), 11% ferrous oxide (FeO), and the heavy metal content of molten iron slag meets the total cadmium <0.1mg / kg, total mercury<0.05mg / kg, total arsenic<5mg / kg, total lead<5mg / kg, total copper<5mg / kg, total nickel<5mg / kg, total zinc<5mg / kg, total manganese<100mg / kg kg, total cobalt<1mg / kg, total selenium<1mg / kg, total vanadium<1mg / kg, total antimony<0.10mg / kg, total thallium<0.10mg / kg, total chromium<10mg / kg (hexavalent chromium< 0.1mg / kg).

[0053] After the iron slag is sieved to 5 mesh, it is directly added to the acidic chromium-containing polluted wastewater (the content of trivalent chromium is 500mg / L, the content of hexavalent chromium is 500mg / L, and the pH is 2.2), and the adding method is manual sprinkling. Iron slag and acidic chromium-containing contaminated wastewater are ful...

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Abstract

The invention relates to the field of heavy metal pollution treatment, in particular to new application of molten iron residues in the field of treating polluted waste water. The method for treating acid chromium-contained polluted waste water with molten iron residues as raw material includes the following steps that 1, molten iron residues are added to acid chromium-contained polluted waste water; 2, after the molten iron residues and the acid chromium-contained polluted waste water are mixed to react with each other for 12 hours to 36 hours, the treated waste water is discharged directly, the molten iron residues precipitated at the bottom and Cr (OH) 3 sediment are collected and recycled. The method for treating acid chromium-contained polluted waste water with molten iron residues as raw material provides a new way for acid chromium-contained polluted waste water treatment and comprehensive utilization of the molten iron residues.

Description

technical field [0001] The invention relates to the field of heavy metal pollution treatment, in particular to a new application of molten iron slag in the field of treatment of acidic chromium-containing polluted wastewater, and further provides a treatment method for acidic chromium-containing polluted wastewater using molten iron slag as raw material. New approaches have been found for the treatment of chromium wastewater and the comprehensive utilization of molten iron slag. Background technique [0002] In recent years, with the rapid development of electroplating, tanning, chemical industry, metallurgy and other industries, the demand for chromium is increasing. However, a large amount of chromium-containing wastewater generated in the production process is difficult to treat. Chromium-containing wastewater is discharged into the environment without treatment, causing serious pollution to the atmosphere, water, and soil. Chromium-containing wastewater mainly contains ...

Claims

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Application Information

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IPC IPC(8): C02F1/52C02F101/20
Inventor 朱李俊程东波吴永津杨刚金强
Owner SHANGHAI MCC ENVIRONMENTAL ENG TECH CO LTD
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