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Process for reducing pollution of hexa covalent chromium ion

A technology of hexavalent chromium ions and blast furnace slag, applied in the field of environmental protection, can solve the problems of difficult mixing of bulk materials, poor long-term stability, harmful rebound, etc., and achieves low production cost, good long-term stability, and a wide range of sources. Effect

Inactive Publication Date: 2005-06-08
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With regard to controlling and reducing the dissolution of hexavalent chromium ions, reduction methods, chemical solidification methods and adsorption methods are generally used abroad at present, such as adding ferrous sulfate (reduction method, the dosage is about 1%) and activated carbon (adsorption method), etc. , its current effect is very good, but there are disadvantages such as high cost, difficulty in mixing in large-volume materials, and poor long-term stability
Poor long-term stability means that under certain environmental conditions, chromium ions that are reduced to low prices are oxidized to hexavalent chromium, causing harmful rebound, which is a major defect of the current existing methods

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] In the aqueous solution with hexavalent chromium ion concentration of 0.03mg / L, according to the solid-liquid mass ratio mixed with 5%, the specific surface area is 450m 2 / kg of modified blast furnace slag powder, after stirring and standing still, the concentration of hexavalent chromium ions will be reduced to below 0.010mg / L, which meets the requirements of my country's national standard GB / T14848-93.

Embodiment 2

[0016] In the aqueous solution with hexavalent chromium ion concentration of 0.08mg / L, according to the solid-liquid mass ratio mixed with 10%, the specific surface area is 450m 2 / kg of modified blast furnace slag powder, after stirring and standing still, the concentration of hexavalent chromium ions will be reduced to below 0.010mg / L, which meets the requirements of my country's national standard GB / T14848-93.

Embodiment 3

[0018] In an aqueous solution with a hexavalent chromium ion concentration of 0.15mg / L, 30% of the specific surface area is 450m2 based on the solid-liquid mass ratio. 2 / kg of modified blast furnace slag powder, after stirring and standing still, the concentration of hexavalent chromium ions will be reduced to below 0.010mg / L, which meets the requirements of my country's national standard GB / T14848-93.

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PUM

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Abstract

A process for dicreasing the pollution of 6-valence Cr ions features that the slags of blast furnace are ground and then proportionally mixed with the Cr-contained aqueous solution or solid waste for reducing the 6-valence Cr ions to become low-valence non-toxic Cr ions and then solidifying them. Its advantages are high efficiency, durably stability and no by-effect.

Description

technical field [0001] The invention belongs to the field of environmental protection, and in particular relates to a method for reducing hexavalent chromium ion pollution. Background technique [0002] Existing studies have shown that the dissolution of heavy metals and toxic metal components (collectively referred to as harmful components) exists in fly ash, garbage incineration ash and some other industrial wastes, and even in cement. The more toxic hexavalent chromium ions Dissolution is one of the important issues. Hexavalent chromium ions are water-soluble, and are easy to dissolve under the action of rainwater and groundwater, causing ecological hazards and causing harm to the human body through water, biological chains, and food chains. With regard to controlling and reducing the dissolution of hexavalent chromium ions, reduction methods, chemical solidification methods and adsorption methods are generally used abroad at present, such as add...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00
Inventor 余其俊
Owner SOUTH CHINA UNIV OF TECH