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Method for processing aluminum section bar chromizing waste water with calcium sulfite type desulphurization mortar

A technology of calcium sulfite and desulfurization ash, applied in chemical instruments and methods, neutralized water/sewage treatment, reduced water/sewage treatment, etc. Inexpensive effect

Inactive Publication Date: 2011-05-04
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hexavalent chromium is highly toxic, harmful, and carcinogenic; in addition, the fluorine content in water also needs to be controlled
Calcium sulfite type desulfurization mortar includes desulfurization ash obtained after drying and desulfurization pulp obtained without drying, which is currently difficult to apply

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Factory A has 6 tons of aluminum profile chromization wastewater, in which the concentration of hexavalent chromium is 2mg / Kg, and the concentration of fluoride ion is 45mg / Kg. The composition (percentage by weight) of calcium sulfite type desulfurization ash in a power plant is: 40% calcium sulfite, 4% lime, 4% calcium hydroxide, 22% calcium carbonate, and 30% fly ash.

[0019] The method for treating aluminum profile bar chromization wastewater with calcium sulfite type desulfurization mortar comprises the following steps:

[0020] (1) the pH value of the chromium-containing waste water in the collection pond is adjusted to 2 with sulfuric acid;

[0021] (2) Add 12 kilograms of calcium sulfite type desulfurization ash, stir for 15 minutes, the hexavalent chromium in the chromating wastewater of aluminum profiles is reduced to trivalent chromium;

[0022] (3) Add NaOH to bring the pH of the wastewater to 8, stir for 10 minutes, so that the trivalent chromium in the wa...

Embodiment 2

[0026] Factory A has 6 tons of aluminum profile chromization wastewater, in which the concentration of hexavalent chromium is 2mg / Kg, and the concentration of fluoride ion is 45mg / Kg. The calcium sulfite type desulfurization slurry composition (percentage by weight) of a power plant is: 20% calcium sulfite, 2% lime, 2% calcium hydroxide, 11% calcium carbonate, 15% fly ash, and 50% water.

[0027] The method for treating aluminum profile bar chromization wastewater with calcium sulfite type desulfurization mortar comprises the following steps:

[0028] (1) the pH value of the chromium-containing waste water in the collection pond is adjusted to 3 with sulfuric acid;

[0029] (2) Add 24 kilograms of calcium sulfite type desulfurization slurry, after stirring for 12 minutes, reduce the hexavalent chromium in the chromating wastewater of aluminum profiles into trivalent chromium;

[0030] (3) Add KOH to bring the pH of the wastewater to 8.5, and stir for 10 minutes, so that the t...

Embodiment 3

[0033] 6 tons of chromating wastewater of aluminum profiles in Plant B, in which the concentration of hexavalent chromium is 10mg / Kg, and the concentration of fluoride ion is 15mg / Kg. The composition (percentage by weight) of calcium sulfite type desulfurization ash in a power plant is: 70% calcium sulfite, 2% lime, 2% calcium hydroxide, 10% calcium carbonate, and 16% fly ash.

[0034] The method for treating aluminum profile bar chromization wastewater with calcium sulfite type desulfurization mortar comprises the following steps:

[0035] (1) the pH value of the chromium-containing waste water in the collection pond is adjusted to 2 with sulfuric acid;

[0036] (2) Add 6 kg of calcium sulfite type desulfurization ash, stir for 15 minutes, and reduce the hexavalent chromium in the chromating wastewater of aluminum profiles into trivalent chromium;

[0037] (3) Add NaOH to bring the pH of the wastewater to 8, stir for 10 minutes, so that the trivalent chromium in the wastewat...

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PUM

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Abstract

The invention discloses a method for treating aluminum profile chromaking wastewater by calcium sulfite desulphurizing mortar. In the method, firstly sulphuric acid is used for adjusting the pH value of aluminum profile chromaking wastewater in a collection tank to be 2-4; then calcium sulfite desulphurizing mortar is added, sufficient stirring is carried out, hexavalent chromium in aluminum profile chromaking wastewater is deoxidized to trivalent chromium; then NaOH is added, the pH value of the wastewater is adjusted to be 7.5-8.5, and trivalent chromium in the wastewater is changed to Cr(OH)3; meanwhile fluorin ions in the wastewater react with calcium hydroxide and calcium oxide in desulphurizing mortar, and CaF2 is produced, and polyacrylamide which is taken as a flocculant is added, after the treatment, the concentration of chrome in water is less than 0.1 mg / Kg, and the concentration of fluorion ion is less than 10 mg / Kg. By utilizing the method of the invention, calcium sulfite desulphurizing mortar is utilized, and the cost for treating aluminum profile chromaking wastewater is reduced, meanwhile hexavalent chromium and fluorin in the wastewater are removed so as to achieving treating waste by waste.

Description

technical field [0001] The invention relates to a method for treating wastewater from chromization of aluminum profiles, in particular to a method for treating wastewater from chromization of aluminum profiles with calcium sulfite type desulfurization mortar, and belongs to the technical field of environmental protection. Background technique [0002] Water is an extremely precious resource. In addition to organic pollution, heavy metal pollution has attracted more and more attention. Hexavalent chromium is highly toxic, harmful, and carcinogenic; in addition, the fluorine content in water also needs to be controlled. Chromating wastewater of aluminum profiles contains pollutants such as hexavalent chromium and fluorine. The current treatment methods include: liquid membrane separation method, solvent extraction method, chemical reduction method and adsorption method. In engineering, the treatment of aluminum profile chromization wastewater mostly uses chemicals such as sod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F1/66C02F1/70C02F1/52C01F11/22
Inventor 苏达根张志杰钟明峰刘志铭黄志其
Owner SOUTH CHINA UNIV OF TECH
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