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Material and method for processing water containing heavy metal ion

A technology for heavy metal ions and sulfur content, applied in water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problem of difficult control of vulcanizing agent addition, unstable water treatment effect, sludge Deal with difficulties and other problems to achieve the effect of good effluent water quality, long operation cycle and good recovery value

Inactive Publication Date: 2010-10-06
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the common problems are that the sedimentation particles are small and require a sedimentation tank. The new fine particles are difficult to completely separate from the water, the water treatment effect is unstable, and the sedimentation sludge is a hazardous waste. The sludge volume is large and the sludge treatment is difficult.
[0005] Research on heavy metal-containing wastewater at home and abroad shows that using sodium sulfide to precipitate heavy metals can achieve a lower effluent concentration than hydroxide precipitation, but due to low concentration, the formed sulfide is difficult to precipitate, and there is difficulty in solid-liquid separation. Simultaneous sulfidation It is also difficult to control the dosage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032]Manganese oxide ore samples were taken, and its mineral composition was mainly manganese oxide, iron oxide, clay minerals, and quartz, in which the mass percentage of manganese was 28%, and the iron content was 10%. Manganese oxide ore is crushed into 2-5mm particles, and packed into an experimental column with a diameter of 12mm and a height of 600mm, which is used for desulfurization of hydrogen sulfide gas. One of the main components of manganese oxide ore desulfurization products is MnS, S and FeS, and the content of sulfide sulfur is 14% by weight. Grind the desulfurization product into a powder of 0.1 mm, put it into copper ion-containing wastewater with a pH of 4 to 7, stir for 30 to 60 minutes, settle for 30 minutes, and measure the concentration of copper ions in the supernatant with an atomic absorption spectrophotometer to obtain Copper ion concentration is less than 0.5mg / L.

Embodiment 2

[0034] Manganese oxide ore samples were taken, and its mineral composition was mainly pyrolusite, goethite, hematite, clay minerals, and quartz, in which the mass percentage of manganese was 32% and the iron content was 8%. The natural manganese oxide ore is crushed into 2-5mm particles, and packed into an experimental column with a diameter of 12mm and a height of 600mm, which is used for desulfurization of hydrogen sulfide gas. One of the main components of manganese oxide ore desulfurization products is MnS, S and FeS, and the content of sulfide sulfur is 12% by weight. Grind the desulfurization product into a powder of 0.1 mm, use water glass as a binder, prepare 2-3 mm particles in a granulator, and fill the prepared particles into a filter column composed of a glass tube with a diameter of 20 mm and a length of 1000 mm. With a concentration of 100mg / L, a copper-containing solution with a pH of 5, pass through the filter experimental column at a rate of 3m / h, take the wat...

Embodiment 3

[0036] The pyrrhotite ore is crushed, the pyrrhotite content is greater than 90% by weight, and the sulfide sulfur content is 32% by weight. Sieve to select particles of 0.1-0.5 mm. Fill the prepared particles into a filter column made of a glass tube with a diameter of 10 mm and a length of 1000 mm, pass the copper-containing solution with a concentration of 100 mg / L and a pH of 5 through the filter experimental column at a rate of 1 m / h, and take the water out of the filter column. The concentration of copper ions in the supernatant was measured with an atomic absorption spectrophotometer, and the concentration of copper ions in the effluent was less than 0.5 mg / L after continuous operation for 10 days.

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Abstract

The invention relates to a material containing heavy metal ions and a handling method thereof, which is characterized in that the material focuses on iron sulfide or manganese sulfide, and by weight percentage, the sulfur content in the material is more than 10 percent; the iron sulfide and manganese sulfide include FeS, MnS, FeS2, Fe3S4, Fe2S3 and Fe1-xS; the heavy metal ions include Cd<2+>, Hg<2+>, Ag<+>, Pb<2+>, Cr<3+>, Cu<2+>, Co<2+>, Ni<2+> and Zn<2+>. The method of the invention makes use of the solubility product difference that the solubility product of iron sulfide or manganese sulfide is far larger than that of the iron sulfide or manganese sulfide of heavy metal ions sulphide, so as to lead to the displacement reaction of the iron sulfide or manganese sulfide and the heavy metal ions in water and remove the heavy metal ions transformed into sulphide from water. The invention does not need solid-liquid separation, has low residual metal concentration in water and wide application range and can recycle polluted heavy metal as resources.

Description

technical field [0001] The invention relates to a water treatment material and method, more specifically a material and method for treating waste water with heavy metal ion content exceeding the discharge standard, or various surface water bodies and groundwater with heavy metal ion content exceeding the standard. Background technique [0002] There are about 40 billion tons of industrial wastewater in my country every year, of which heavy metal wastewater accounts for a large proportion. Heavy metal wastewater is widely distributed, including mining, smelting, electrolysis, electroplating, pesticides, medicine, paint, chemicals, pigments and other industries. Water, especially soil pollution, caused by the discharge of heavy metal-containing wastewater has become a major enemy that threatens human health. [0003] At present, the treatment methods of heavy metal wastewater at home and abroad can be divided into two categories. One is to tran...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/62
Inventor 陈天虎谢晶晶李晓星孙玉兵谢巧勤何宏平
Owner HEFEI UNIV OF TECH
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