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Method for simultaneously treating high ammonia-nitrogen wastewater and carbide slag

A calcium carbide slag and high ammonia nitrogen technology, applied in the field of environmental engineering, can solve problems such as occupying a large site, pollution, non-compliant reduction, and reuse

Active Publication Date: 2010-12-15
JIANGSU HUASHAN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Although this method is a harmless discharge solution, it requires 700 kilowatt-hours of electricity and 200Kg of methanol to process 1 ton of ammonium chloride mother liquor, and 500Kg of coal and 11M of water are required to produce these electricity and methanol. 3 , so from the perspective of the ecological environment, this method has caused greater pollution while controlling pollution
[0011] In addition, calcium carbide slag is solid waste discharged by PVC enterprises, which needs to occupy a large amount of space for stacking, which is already a big burden on the industry
Some studies have proposed a method of producing calcium chloride with industrial hydrochloric acid and carbide slag. Although this method treats carbide slag but consumes new resource hydrochloric acid, it is also a treatment method that consumes resources, but it does not meet the requirements of reduction and recycling. principle of use

Method used

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  • Method for simultaneously treating high ammonia-nitrogen wastewater and carbide slag
  • Method for simultaneously treating high ammonia-nitrogen wastewater and carbide slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Take 1 ton of calcium hydroxide 30% calcium carbide slag (carbide slag is discharged from polyvinyl chloride enterprises) and 0.723 tons of ammonium chloride mother liquor containing 30% ammonium chloride (ammonium chloride mother liquor is wastewater discharged from hydrometallurgy), Put it into a reaction kettle with a rectification tower (the number of trays is 40), heat it to 100°C under stirring, and react for 2 hours. The ammonia gas rises to the top of the tower, and 0.69 tons of mass percent can be condensed through the top condenser Concentration is the ammoniacal liquor of 20%, obtains 1.03 tons of mass percentage concentration in tower kettle and is 43% calcium chloride solution.

Embodiment 2

[0023] Take 1 ton of calcium hydroxide 30% calcium carbide slag (carbide slag is discharged from polyvinyl chloride enterprises) and 0.8 tons of ammonium chloride mother liquor containing 30% ammonium chloride (ammonium chloride mother liquor is wastewater discharged from hydrometallurgy), Put it into a reaction kettle with a rectification tower (the number of trays is 45), heat it to 90°C under stirring, react for 2.2 hours, ammonia rises to the top of the tower, and can condense 0.78 tons of mass percent through the top condenser Concentration is 22% ammoniacal liquor, obtains 0.98 ton mass percent concentration in tower still and is 45% calcium chloride solution.

Embodiment 3

[0025] Take 1 ton of calcium hydroxide 30% calcium carbide slag (carbide slag is discharged from polyvinyl chloride enterprises) and 0.5 ton of ammonium chloride mother liquor containing 30% ammonium chloride (ammonium chloride mother liquor is wastewater discharged from hydrometallurgy), Put it into a reaction kettle with a rectification tower (the number of trays is 42), heat it to 95°C under stirring, and react for 1.8 hours. The ammonia gas rises to the top of the tower and can be condensed by 0.53 tons of mass percent through the top condenser. Concentration is the ammoniacal liquor of 21%, obtains 0.95 tons of mass percentage concentration in tower kettle and is the calcium chloride solution of 38%.

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Abstract

The invention discloses a method for simultaneously treating high ammonia-nitrogen wastewater and carbide slag, which is characterized by comprising the following steps of: putting the carbide slag and ammonium chloride mother solution into a reactor with a rectifying column, and respectively collecting ammonia water and calcium chloride solution; and performing reaction at the temperature of between 90 and 110 DEG C for 1.8 to 2.2 hours. Aiming at the high ammonia-nitrogen wastewater discharged by the wet-process metallurgy industry and the carbide slag discharged by the polrvinyl chloride industry, the simple method realizes the recycling of ammonia in the wet-process metallurgy industry, simultaneously treats the production waste discharged by the polrvinyl chloride industry, produces calcium chloride and water, and fully reflects the cyclic economy rule of waste reduction and reclamation.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and in particular relates to a method for simultaneously treating high-ammonia-nitrogen wastewater and carbide slag, which can not only control pollution but also be resourceful. Background technique [0002] The hydrometallurgical industry often uses ammonia water as a metal extractant. For example, in the process of vanadium extraction, the vanadium-containing ore is first soaked with hydrochloric acid to convert the water-insoluble vanadium dioxide into water-soluble hydrochloric acid vanadium oxide, which is dissolved from the ore. out, and then react with ammonia and vanadate to generate ammonium metavanadate crystal precipitation, and complete the extraction process of vanadium, the equation is as follows: [0003] 2VO 2 + HClO + HCl = 2VO 2 Cl+H 2 O ……………………… (1) [0004] VO 2 Cl + 2NH 3 + H 2 O = NH 4 VO 3 ↓ + NH 4 Cl…………………(2) [0005] It can be seen from...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/00B09B3/00C01C1/02C01F11/24
Inventor 李祖华
Owner JIANGSU HUASHAN ENVIRONMENTAL PROTECTION TECH