Studies on Treatment of Wastewater with High Concentration of Ammonia Nitrogen in the Process of Rear Earth Metallurgy

Studies on Treatment of Wastewater with High Concentration of Ammonia Nitrogen in the Process of Rear Earth Metallurgy
　　This is according to the subject: The study of removing ammonia nitrogen which comes from waste water in the Process of rear earth metallurgy, through to expound the rare earth smelting craft, and inspected the process flow of sour law metallurgy and alkali law metallurgy of rare earth the two kinds of types. Combined the process flow, had further understood the way, type and essential component of smelting waste water. The main pollutant of rare earth smelting waste water is ammonia nitrogen, and the concentration is very high. According to the present of rare earth smelting waste water pollution situation, introduced the harm of ammonia nitrogen waste water, then introduced home and abroad disposal of ammonia nitrogen waste water. Synthesizes each kind of e Block Neodymium magnets xisting processing technology, this article decide to use blow-off method and the ion exchange technique unify to carry on the experiment. The ammonia nitrogen waste water is from the laboratory simulation. The concentration of ammonia nitrogen in original water is approximately 10000mg/L, according to influence factor research of the two methods processing for ammonia nitrogen waste water, has made certain the best experimental condition.The main influence factors of removing ammonia nitrogen with blow-off method are temperature, pH, aeration quantity and blows escapes the time, considered the economic factor, the experiment carries on under the room temperature, Through the theory research of pH which influence the removing of the ammonia nitrogen, Adjust the pH to 9, 10.5, 11, 12, finally determined the best pH is 10.5,The other two important factors are aeration quantity and http://www.999magnet.com/ aeration time, the experiment determined the best aeration quantity is 1.5L/min, the aeration time is 48h (namely gas/ liquid = 8640).The ionic exchange craft uses the zeolite, porcelain stone and crockery to carry on the adsorption. According to the experiment result, it had bad effort of using porcelain stone and crockery to carry on the adsorption, but used the zeolite can obtain the good effect. The waste water of disposal by zeoliteadsorption Block Neodymium magnets is which comed from the former step. The concentration of NH4-N is 1770mg per litre, pH is 8.0, after the first adsorption, it can make the ammonia nitrogen removing rate achieved 85.9%, the zeolite regeneration uses the the muffle furnace to drying, drying 1h under the temperature of 200℃, the second adsorption can make the adsorption capacitance achieved 5.73mg/g, When the ammonia nitrogen concentration of original water is 1770mg/L, removing rate is 69.18%. After several times regeneration, the adsorption capacitance also can achieve 5.39mg/g. After the second adsorption, the waste water from blow-off can achieve the discharges the standard. 更多还原