A method for resource processing non-ferro metals processing wastewater containing ammonia and sulfate radical

A non-ferrous metal and sulfate technology, applied in the metal processing process, the recovery of ammonia and sodium sulfate, can solve the problems of resource loss, high equipment investment, complex treatment process, etc., to achieve the effect of eliminating pollution

Active Publication Date: 2008-04-16
BEIJING CYCLE COLUMBUS ENVIRONMENTAL SCI & TECH
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] Water is a precious non-renewable resource, but the waste water produced by some metal processing processes cannot be reused in the metal processing process because it contains high concentrations of ammonia and sulfate. The water treatment technology that introduces impurity ions is of great significance to improve the water reuse rate of metal processing engineering
[0006] However, so far there is no one that can treat industrial wastewater containing ammonia, sulfate radicals, and heavy metal ions. Simply combining the above-mentioned treatment technologies not only requires high equipment investment and complicated treatment processes, but also easily causes resource loss.

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  • A method for resource processing non-ferro metals processing wastewater containing ammonia and sulfate radical

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Embodiment 1

[0033] The water quality of a vanadium and molybdenum catalyst processing wastewater is: ammonia nitrogen concentration 10000mg / L, sulfate concentration 139000mg / L, vanadium concentration 600mg / L, molybdenum concentration 300mg / L, pH value 2.1. During the treatment, adjust the pH of the wastewater to be treated to 12 with 45% sodium hydroxide, and then transport it to a rectification column with 1 theoretical plate in the rectification section and 10 theoretical plates in the stripping section. Rectification is carried out under 1 atmospheric pressure, and the gas at the top of the tower is condensed into a liquid at 45°C, 20% of which is refluxed, and the remaining 80% is collected as a product; the water in the tower kettle enters the cooling crystallization reactor after being cooled down, and in the cooling crystallization reactor , the liquid temperature was lowered to 1°C, and the mixture was filtered after 5 hours to obtain sodium sulfate crystals and treated water. The...

Embodiment 2

[0035] The water quality of a vanadium-containing industrial waste residue processing wastewater is: ammonia nitrogen concentration 14000mg / L, sulfate concentration 103000mg / L, vanadium concentration 460mg / L, pH value 8.7. During the treatment, adjust the pH of the waste water to be treated to 12.5 with 45% sodium hydroxide, and then transport it to a rectification column with 5 theoretical plates in the rectification section and 20 theoretical plates in the stripping section. Distillation treatment, the top gas is condensed into liquid at 5°C, 70% of which is refluxed, and the remaining 30% is collected as a product; the water in the tower kettle enters the cooling crystallization reactor after cooling treatment, and the liquid temperature is lowered in the cooling crystallization reactor After 5 hours at 7°C, the mixture was filtered to obtain sodium sulfate crystals and treated water. Analysis shows that the water quality indicators after treatment are as follows: ammonia n...

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Abstract

The invention relates to a novel process for recycling treatment for waste water which contains ammonia and sulfate radicals and is produced in the process of non-ferrous metal processing. The invention is characterized in that: sodium hydroxide is added into the waste water to convert ammonium ions in the waste water into molecular ammonia; then the waste water is heated by heat resource in a rectification tower; the ammonia in the waste water enters into a condenser in the form of gas from the top of the tower to be cooled into liquid ammonia and partial liquid ammonia returns, thus the remainder becomes the product; the water removed of ammonia exchanges heat with the waste water to be treated and then continues to be cooled, thus sodium sulfate crystals are obtained; the water removed of sodium sulfate removed is removed also sulfate radicals and ammonia, and can directly return to a production plant. The invention has a combined process of ammonia rectification recycle and sodium sulfate cooling crystallization, ensures the recycling use of the water as the ammonia in the water is reclaimed in the form of liquid ammonia or ammonia water as well as the sulfate radicals are reclaimed in the form of sodium sulfate, retains valuable metal ions in the water, and improves the recycling rate of the resource. In a word, the process can realize the recycling utilization of ammonia-nitrogen waste water produced by non-ferrous metal processing, has a simple process flow, is suitable for large-scale industrial production, and has both economic and environmental benefits.

Description

technical field [0001] The invention belongs to the field of waste resource treatment or metallurgy, and relates to a method for resource treatment of waste water containing ammonia and sulfate radicals produced in the process of non-ferrous metal processing, in particular to a process of rectification-low temperature crystallization from waste water A method of recovering ammonia and sodium sulfate and reusing the treated water in metalworking processes. Background technique [0002] Sulfuric acid and ammonia are commonly used acids and alkalis in the processing of non-ferrous metals. However, in the production process, these substances often enter the waste water together with some ionic non-ferrous metal ions. If they are not effectively treated, they will not only waste resources, and may cause serious environmental pollution, such as ammonia entering the water body can easily cause "algae proliferation", resulting in the death of fish and shrimp due to lack of oxygen; s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F1/66C02F1/20C02F1/22C02F101/16C02F103/16
Inventor 曹宏斌李玉平张懿
Owner BEIJING CYCLE COLUMBUS ENVIRONMENTAL SCI & TECH
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