自酸洗废液制磁性铁泥的氧化共沉淀工艺研究

Process study on oxidation coprecipitation preparation of black magnetic iron mud from pickling waste liquid

采用氧化共沉淀方法处理总铁质量分数为3.0%~15.0%的酸洗废液,制备可用作炼铁原料的高含铁磁性铁泥。以磁性铁泥中干基铁含量为评价指标,研究了中和温度、氧化稀释比、氧化温度、氧化pH、氧化铁比[n(铁3+)/n(铁^(2+))]、氧化气速、脱水合成pH、脱水合成稀释比、脱水合成温度等主要影响因素,得出最佳工艺条件。在中和温度为45℃、氧化稀释比为10.0、氧化温度为45℃、氧化pH为8.0、氧化铁比为1.7、氧化气速为1.2 L/min、脱水合成pH为8.0、脱水合成稀释比为10.0、脱水合成温度为107℃条件下,可制得铁质量分数为57.4%的磁性铁泥。该方法实用价值高,具有较好的经济和社会效益。

Black magnetic iron mud which could be used for iron smelting was prepared by oxidation co-precipitation method from the treatment of pickling waste liquid with a mass fraction of total iron at 3.0%-15.0%.The iron content of final product was used as the evaluation index to evaluate the treatment process parameters, including neutralization temperature, oxidation dilution ratio,oxidation temperature,oxidation pH,the amount-of-substance ratio of ferric/ferrous,oxidation gas velocity, dehydration pH, dehydration dilution ratio, and dehydration temperature etc., so as to obtain the optimal conditions.Under the neutralization temperature of 45 ℃, oxidation dilution ratio of 10.0, oxidation temperature of 45 % ,oxidation pH of 8.0,the amount-of-substance ratio of ferric/ferrous of 1.7, gas velocity of 1.2 L/min, dehydration synthesis pH of 8.0, dilution ratio of 10.0, and dehydration temperature of 107℃ ,iron mass fraction of the as-prepared product from the pickling waste liquid reached 57.4%.The technique had the advantage of effectiveness, and will bring out great economic profits and social benefits.