Recycling method for treating sludge containing heavy metals

A technology for heavy metal sludge and treatment methods, applied in sludge treatment, water/sludge/sewage treatment, chemical instruments and methods, etc.

Inactive Publication Date: 2011-05-04
SHANGHAI JIHUI REMONDIS ENVIRONMENT PROTECTION TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to completely solve the re-pollution of heavy metal sludge, it is necessary to find a new set of economical and renewable resource recycling schemes. The waste residue of heavy metal sludge is completely decomposed so that renewable resources can be comprehensively and rationally Utilization will not cause secondar

Method used

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  • Recycling method for treating sludge containing heavy metals
  • Recycling method for treating sludge containing heavy metals

Examples

Experimental program
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Embodiment 1

[0029] A resourceful treatment method for sludge containing heavy metals, comprising the following steps:

[0030] 1. Use mechanical chopping to cut the large solids containing heavy metal sludge into small particles with a particle size of 5-10mm, so that the sulfuric acid in the subsequent treatment steps can fully acidify and leach heavy metals ion;

[0031] 2, according to the ratio of 1: 0.3 by volume ratio of heavy metal-containing sludge and sulfuric acid, adding weight percent concentration in the acidolysis kettle is 50wt% sulfuric acid, sulfuric acid can be industrial sulfuric acid or waste sulfuric acid, then the small particles prepared in step 1 containing The heavy metal sludge is continuously or batch-wise added to the acidolysis tank. During the feeding process, mechanical stirring from top to bottom and mechanical stirring along the circumference are always used; during the reaction process, the feeding speed is controlled to keep the reaction temperature in t...

Embodiment 2

[0040] A resourceful treatment method for sludge containing heavy metals, comprising the following steps:

[0041] 1. Use mechanical chopping to cut the large solids containing heavy metal sludge into small particles with a particle size of 5-10mm, so that the sulfuric acid in the subsequent treatment steps can fully acidify and leach heavy metals ion;

[0042] 2, according to the ratio of 1: 0.4 in the volume ratio of heavy metal-containing sludge and sulfuric acid, add weight percent concentration in the acidolysis kettle and be 40wt% sulfuric acid, sulfuric acid can be industrial sulfuric acid or waste sulfuric acid, then the small particles prepared in step 1 containing The heavy metal sludge is continuously or batch-wise added to the acidolysis tank. During the feeding process, mechanical stirring from top to bottom and mechanical stirring along the circumference are always used; during the reaction process, the feeding speed is controlled to keep the reaction temperature...

Embodiment 3

[0051] A resourceful treatment method for sludge containing heavy metals, comprising the following steps:

[0052] 1. Use mechanical chopping to cut the large solids containing heavy metal sludge into small particles with a particle size of 5-10mm, so that the sulfuric acid in the subsequent treatment steps can fully acidify and leach heavy metals ion;

[0053] 2, according to the ratio of 1: 0.5 in the volume ratio of heavy metal-containing sludge and sulfuric acid, it is 30wt% sulfuric acid to add weight percentage concentration in the acidolysis kettle, sulfuric acid can be industrial sulfuric acid or waste sulfuric acid, then the small particles prepared in step 1 containing The heavy metal sludge is continuously or batch-wise added to the acidolysis tank. During the feeding process, mechanical stirring from top to bottom and mechanical stirring along the circumference are always used; during the reaction process, the feeding speed is controlled to keep the reaction temper...

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Abstract

The invention discloses a recycling method for treating sludge containing heavy metals, which comprises the following steps: leaching out heavy metals in sludge containing heavy metals by using acid liquor, carrying out ultrasonic treatment on the acid leaching liquor, carrying out solid-liquid separation to separate precipitate containing calcium sulfate from acid liquor containing heavy metal ions, treating the leached acid liquor with ferrous sulfate, regulating the pH value of the acid liquor, and adding ferrooxidant to oxidize the acid liquor, thereby forming ferrite; and washing and drying the calcium sulfate precipitate to form plaster. The invention is suitable for treating various kinds of sludge containing heavy metal ions, has the advantages of favorable technique universality, simple technological conditions and strong operability, and can realize large-scale production. The invention can treat waste by using waste, save energy, reduce emissions and realize harmless resource recycling.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a resource treatment method for sludge containing heavy metals. Background technique [0002] With the development of modern industry, the amount of sludge containing heavy metals has increased dramatically. Heavy metal sludge mainly comes from electroplating industry, metal surface treatment industry, printed circuit board industry, etc. These industries produce a large amount of wastewater containing heavy metals such as chromium, nickel, copper, zinc, and iron. At present, lime is used to neutralize and precipitate this type of wastewater, but the heavy metals in the wastewater are transferred to the sludge and become sludge containing a large amount of heavy metals. There are two common treatment methods for the treatment of sludge containing heavy metals: one is to use cement to solidify heavy metal sludge before landfilling; the other is to mix heavy metal...

Claims

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Application Information

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IPC IPC(8): C01F11/46C01G49/06C02F11/00
Inventor 刘正华谢炜
Owner SHANGHAI JIHUI REMONDIS ENVIRONMENT PROTECTION TECH DEV
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