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对钠硅渣脱碱后的水化石榴石通入CO2气体转型的反应进行了热力学分析,研究了温度、时间、改性次数、Na2CO3浓度对转型效果的影响,并且研究了转型后渣溶铝过程中,苛性碱浓度、温度、液固比、反应时间对氧化铝溶出率的影响。结果表明:钠硅渣脱碱后形成的水化石榴石能被CO2分解,在分解过程中硅化合物易形成CaO.S iO2.H2O、6CaO.6S iO2.H2O。反应时间的延长,适当的反应温度,有利于提高水化石榴石的转化率,同时改性处理也可以提高转化率。在溶铝过程中,时间延长,液固比提高,碱浓度升高,以及适宜的反应温度均可提高溶铝效率。试验最佳工艺条件为:转型最佳工艺为时间2 h,液固比5~10,温度50℃,改性一次;溶铝最佳工艺为温度50℃,液固比为10,时间1 h,碱浓度大于50 g/L,最优条件下氧化铝溶出率达60%以上,弃渣中铝硅比A/S小于0.6。
The reaction of hydration garnet into CO2 gas after desalination of sodium silicate deoxidized was analyzed by thermodynamics. The effects of temperature, time, number of modification and concentration of Na2CO3 on the transformation were studied. The effects of slag dissolving aluminum During the process, the influence of caustic concentration, temperature, liquid-solid ratio and reaction time on the dissolution rate of alumina was investigated. The results show that the hydrated garnet formed after the desodiumization of sodium silicate can be decomposed by CO2, and the silicon compounds are easy to form CaO.SiO2.H2O, 6CaO.6S iO2.H2O during the decomposition process. The extension of the reaction time and the proper reaction temperature will help to improve the conversion rate of hydration garnet, meanwhile, the modification can also improve the conversion rate. In the process of dissolving aluminum, the prolongation of the time, the increase of liquid-solid ratio, the increase of alkali concentration, and the suitable reaction temperature can all improve the aluminum-dissolving efficiency. The optimum technological conditions were as follows: the best transformation process was time 2 h, the ratio of liquid to solid was 5 ~ 10 and the temperature was 50 ℃, the optimal process was the temperature 50 ℃, liquid-solid ratio 10 and time 1 h , The alkali concentration is more than 50 g / L, the optimum conditions of alumina dissolution rate of more than 60%, aluminum slag ratio of A / S less than 0.6.