Production process for treating ammonia-nitrogen wastewater

A production process and ammonia nitrogen wastewater technology, which is applied in filtration treatment, water/sewage treatment, frozen water/sewage treatment, etc., can solve the problems of poor conversion rate of water washing process, and achieve the effect of low cost, simple operation and strong feasibility

Active Publication Date: 2018-06-08
JINDUICHENG MOLYBDENUM CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This leads to a relatively poor conversion rate in the water washing process

Method used

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  • Production process for treating ammonia-nitrogen wastewater
  • Production process for treating ammonia-nitrogen wastewater

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Experimental program
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Effect test

Embodiment

[0037] Add 2000ml of pure water into a 2500ml three-neck flask, add 400g of industrial molybdenum oxide in proportion, and add 35ml of nitric acid for acidification, use steam to heat and keep warm for one hour, and discharge the material after the reaction is completed. The filter cake contains about 30% of water, and the calculated filter cake contains 171ml of water. This process produces 1830ml of waste water. Use a three-necked flask to concentrate and evaporate this part of the waste water. The acid mist formed by evaporation is collected by a condenser until it evaporates to the original One-tenth of the liquid, 1230ml of dilute nitric acid was collected after the experiment. After cooling, nitrate crystals appeared. After filtration, 130ml of concentrated ammonia water was added to adjust the pH value to 4, and then ammonium sulfide was added for heat preservation reaction for 0.5 hours, and the solution formed a paste. After cooling, utilize suction filtration facility...

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Abstract

The invention discloses a production process for treating ammonia-nitrogen wastewater. By adopting a mode that concentrated wastewater is heated and evaporated, and a precipitant is added to remove most cation and anion in a liquid in a cooling crystallization mode, ions in a circulated solution cannot be enriched, advantages of an acid salt pretreatment process in ammonium molybdate production are ensured, the problem that wastewater of a conventional ammonium molybdate production line is hard to treat is solved, and the production process has the characteristics of zero wastewater emission,circulation utilization and environmental protection.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a production process for treating ammonia nitrogen wastewater. Background technique [0002] Ammonium molybdate is an important link in the molybdenum processing industry chain, and also an important chemical raw material, which is widely used in metallurgy, chemical industry, catalyst and other industries. [0003] The processing process of ammonium molybdate generally includes salt pretreatment, ammonia leaching, acid precipitation, ammonia dissolution, evaporation, etc. As the country pays more and more attention to environmental protection, in recent years, some large manufacturers have introduced foreign acid-free ammonium molybdate production This process uses water washing for the pretreatment of raw materials. The water washing process does not completely solve the problem of wastewater pollution, but it brings limitations of process technology, r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F101/16
CPCC02F1/001C02F1/048C02F1/22C02F1/58C02F1/586C02F1/66C02F9/00C02F2101/16
Inventor 田建荣孙耀林徐芳苓张旸刘蕾
Owner JINDUICHENG MOLYBDENUM CO LTD
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