Novel method for direct extraction recovery of ammonia nitrogen from electrolyzed manganese slag

Abstract

The invention discloses a novel method for direct extraction recovery of ammonia nitrogen from electrolyzed manganese slag. The novel method comprises the following steps of directly adding an alkaline preparation and a foaming agent into fresh manganese slag subjected to crushing, dispersion, drying and ball-milling so that a pH value and humidity in an electrolyzed manganese slag environment are changed and transformation of a solid phase and a liquid phase into a gas phase is promoted, and introducing released NH3 gas into a multistage absorption device by a negative-pressure suction device cover located above a mixer so that the released NH3 gas is absorbed by water or dilute sulphuric acid and then is transformed into ammonia water or ammonium sulfate. The novel method for direct extraction recovery of ammonia nitrogen from electrolyzed manganese slag solves the problem that the existing extraction recovery methods have high water consumption, high energy consumption and complex processes, greatly reduces environmental pollution hidden troubles of ammonia nitrogen in manganese slag, and realizes extraction and utilization of an ammonia nitrogen resource well.

Description

Technical field [0001] The invention relates to the technical field of resource recycling, in particular to a method for directly extracting and recovering ammonia nitrogen from electrolytic manganese slag. Background technique [0002] Manganese is an important strategy and basic material of the national economy, and has a very important strategic position in the national economy. Due to the rapid development of my country's social economy, the demand for electrolytic manganese is increasing, and my country's electrolytic manganese industry has also been developing rapidly. Currently, electrolytic manganese is the second largest industry of ferrous metallurgy in my country. As of the end of 2007, the total production capacity of my country's electrolytic manganese enterprises reached 1.78 million tons, and the actual output was 1.02 million tons. Both the production capacity and actual output accounted for more than 97% of the world's total, making China the world's largest pro...

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Problems solved by technology

However, this method consumes a lot of water, energy is high and the process is complex

Tao Changyuan of Chongqing University and others studied the method of recovering ammonia nitrogen from electrolytic manganese slag by using the slag washing with water-aluminum salt precipitation method, and discussed the influence of precipitant dosage, reaction temperature and other conditions on the recovery rate of ammonia nitrogen. The recovery of ammonia nitrogen can reach more than 95%, and good results have been achieved, but the recovery process needs to be heated to 95°C, the reaction time needs 2 hours, and the price of the treatment agent is relatively high, which is not conducive to the development of this technology in terms of cost and process Practical application, real industrial application still has a long way to go

Yu Hongbing and others from Nankai University used distilled water to extract ammonia nitrogen from ammonia nitrogen slag, and the extraction rate can reach more than 60%. The conditions are relatively harsh, and the technology is still in the exploratory stage

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