Method for purifying molybdenum sulfide in heavy metal waste water containing molybdenum, and the like

A purification method and heavy metal technology, applied in the direction of molybdenum sulfide, chemical instruments and methods, water/sewage treatment, etc., to achieve the effect of reducing content, high recycling rate, and reducing purification cost

Active Publication Date: 2011-02-16
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] At present, there is no use of adding sulfide precipitation to treat heavy metal molybdenum-containing wastewater and recover molybdenum in the published patents, and the hydrogen sulfide gas generated in the reaction can be solved by sealing the device and absorbing it with lye. After a large number of The experiment also proves that this method is very effective for the removal of heavy metal molybdenum, and the recovery rate is also very high

Method used

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  • Method for purifying molybdenum sulfide in heavy metal waste water containing molybdenum, and the like
  • Method for purifying molybdenum sulfide in heavy metal waste water containing molybdenum, and the like

Examples

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Embodiment 1

[0020] Prepare a solution containing 100 mg / L molybdenum, 5 mg / L iron, 5 mg / L copper, and 5 mg / L zinc, adjust the pH of the solution to alkaline with a sodium hydroxide solution, and adjust the mass ratio of molybdenum to sodium sulfide at 1:3 Dosing sodium sulfide in the ratio of 1, reacting at room temperature for 1 hour, adding flocculant to the resulting solution and stirring rapidly, standing for 5 minutes, draining the clear liquid on the sediment and filtering. Adjust the pH value of the filtered solution to 2 with hydrochloric acid solution, react at room temperature for 2 hours, add flocculant polyacrylamide after precipitation occurs and stir rapidly, let stand for 5 minutes, discharge the clear liquid on the precipitate and filter. Adjust the pH value of the filtered solution to a neutral condition, add a mixed coagulant of polyaluminum chloride and ferrous sulfate and stir rapidly, let stand for 2 minutes, drain the supernatant on the sediment and filter. Detect th...

Embodiment 2

[0023] Prepare a solution containing 100 mg / L molybdenum, 5 mg / L iron, 5 mg / L copper, and 5 mg / L zinc, adjust the pH of the solution to alkaline with a sodium hydroxide solution, and adjust the molar ratio of molybdenum to sodium sulfide at 1:6 Dosing sodium sulfide in the ratio of 1, reacting at room temperature for 1 hour, adding flocculant to the resulting solution and stirring rapidly, standing for 5 minutes, draining the clear liquid on the sediment and filtering. Adjust the pH value of the filtered solution to 2 with hydrochloric acid solution, react at room temperature for 2 hours, add flocculant polyacrylamide after precipitation occurs and stir rapidly, let stand for 5 minutes, discharge the clear liquid on the precipitate and filter. Adjust the pH value of the filtered solution to a neutral condition, add a mixed coagulant of polyaluminum chloride and ferrous sulfate and stir rapidly, let stand for 2 minutes, drain the supernatant on the sediment and filter. Detect t...

Embodiment 3

[0026] Prepare a solution containing 100 mg / L molybdenum, 5 mg / L iron, 5 mg / L copper, and 5 mg / L zinc, adjust the pH of the solution to alkaline with a sodium hydroxide solution, and adjust the molar ratio of molybdenum to sodium sulfide at 1:6 Dosing sodium sulfide in the ratio of 1, reacting at room temperature for 1 hour, adding flocculant to the resulting solution and stirring rapidly, standing for 5 minutes, draining the clear liquid on the sediment and filtering. Use hydrochloric acid solution to adjust the pH value of the filtered solution to 1, react at room temperature for 2 hours, add flocculant polyacrylamide after precipitation occurs and stir rapidly, let stand for 5 minutes, discharge the clear liquid on the precipitate and filter. Adjust the pH value of the filtered solution to a neutral condition, add a mixed coagulant of polyaluminum chloride and ferrous sulfate and stir rapidly, let stand for 2 minutes, drain the supernatant on the sediment and filter. The co...

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Abstract

The invention belongs to the technical field of water treatment, in particular to a method for purifying molybdenum sulfide in heavy metal waste water containing molybdenum, and the like. The method comprises the following steps of: putting waste water containing the heavy metal molybdenum and other heavy metals to be purified in a reaction tank; regulating the waste water to alkalinity and adding sodium sulfide for reacting; filtering the waste water and putting filtered water in a sealing device; regulating the pH value of the waste water to 1-3 and reacting at normal temperature to guarantee that molybdenum acid radical ions are all converted into molybdenum sulfide to precipitate; absorbing gas generated by using an absorption tower, wherein sodium hydroxide is used as absorption liquid; adding polyacrylamide used as a flocculating agent to an obtained solution and quickly stirring for reacting; standing still; after the precipitate subsides, draining the supernate, filtering through a filtering device, and treating the precipitate for recycling; regulating the pH of the obtained acid solution to neutrality, adding a coagulant compounded by polymeric aluminum and ferrous sulphate and quickly stirring to remove redundant sulfur ions and further improve the quality of yield water; standing still; and after the precipitate subsides, filtering. The invention has the advantages of good treatment effect, simple and convenient treatment equipment, low treatment cost, higher purity of recovered molybdenum sulfide, and the like.

Description

technical field [0001] The invention belongs to the technical field of water treatment, in particular to the treatment of waste water or sewage, in particular to a method for purifying molybdenum sulfide in waste water containing heavy metals such as molybdenum. Background technique [0002] With the rapid development of science and technology, the application range of molybdenum and its compounds is becoming wider and wider, the consumption is increasing, and the limited molybdenum resources are decreasing day by day. Therefore, the recycling of waste molybdenum is of great significance. The production wastewater not only contains heavy metal molybdenum, but also other heavy metal ions, which increases the difficulty in the purification and recovery of heavy metal molybdenum. Improper handling will result in high heavy metal content in recycled products or waste of valuable molybdenum. [0003] At present, the treatment method of heavy metal-containing wastewater is mostl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/62C02F1/52C02F9/04C01G39/06C02F1/66
Inventor 李风亭张冰如忻少华
Owner TONGJI UNIV
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