Method for treating ammonia nitrogen in tungsten smelting by using extraction absorption

Abstract

The invention discloses a method for treating ammonia nitrogen in tungsten smelting by using extraction absorption. According to the method, the recovery rate of the ammonia nitrogen is further improved, and the working environment is improved and the production cost is decreased. Primary extraction: organic phase extractants are added to weak aqua ammonia recycled by evaporation to perform extraction to obtain ammonium ions NH4+, and free water and hydroxide ions in ammonia water enter extraction residual liquid water phases; secondary extraction: industrial concentrated hydrochloric acids are added in extracted organic phases, heavy phases after reverse extraction are ammonium chloride at the bottom; light phases containing P507 organic phases enter a next circle for extraction after washing; an reverse extraction solution of an ammonium chloride solution is subjected to ammonia absorption; ammonia water with a concentration of 110g / l returns to a tungsten smelting departure and transfer procedure to serve as an analyzing agent; and final washing: salt-free water is added to organic phases after reverse extraction, organic phase residual ammonium chloride is guaranteed to be discharged as far as possible, an after-washing solution is an ammonium chloride solution, the ammonium chloride solution and the reverse extraction of the last step are subjected to ammonia absorption, and an organic phase extraction agent P507 after washing enters a next circle for usage. The method further improves the ammonia nitrogen recovery rate, the work environment is improved, and the production cost is reduced.

Description

technical field [0001] The invention relates to the application of a novel extraction and absorption combined technology in the treatment of ammonia nitrogen in tungsten smelting. Background technique [0002] At present, in tungsten smelting, the evaporation and crystallization method is used to recover ammonia to produce ammonium chloride, so as to realize the recycling of ammonia nitrogen. The existing technology has the disadvantages of low recovery rate of ammonia nitrogen, large energy consumption and high cost of evaporation and crystallization. A low recovery rate will inevitably lead to a poor working environment and difficult discharge of wastewater. At the same time, as the price of oil continues to rise, the cost of evaporation recovery will also become higher and higher. Therefore, it is of great significance to develop a recovery process with low energy consumption to replace the current evaporation crystallization process. Contents of the invention [0003...

AI Technical Summary

Problems solved by technology

[0002] At present, in tungsten smelting, the evaporation and crystallization method is used to recover ammonia to produce ammonium chloride, so as to realize the recycling of ammonia nitrogen. The existing technology has the disadvantages of low recovery rate of ammonia nitrogen, large energy consumption of evaporation and crystallization, and high cost.

Low recovery rate will inevitably lead to poor working environment and difficult discharge of wastewater

At the same time, as the price of oil continues to rise, the cost of evaporation recovery will also become higher and higher

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