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在实验室对天然Ca 蒙脱进行了纯化 ,并在一定条件下人工合成了针铁矿、水锰矿 ,以此作为实验材料 ,用吸附—解吸平衡法和反应动力学方法研究了温度对硼在Ca 蒙脱 ,针铁矿 ,水锰矿上的吸附、解吸特性的影响。结果表明 :随温度升高 ,Ca 蒙脱对硼的吸附量升高 ,其对硼的解吸滞后性下降 ,水锰矿和针铁矿对硼的吸附量下降 ,其对硼的解吸滞后性加强。计算表明 ,在常温下 ,硼在Ca 蒙脱上的吸附热为 63.0 8kJmol- 1 ,在针铁矿和水锰矿上分别为 - 1 2 2 .45和 - 93 .91kJmol- 1 ,硼在Ca 蒙脱、针铁矿和水锰矿上的解吸热分别为- 31 .0 2 ,53 .95和 46 .30kJmol- 1 。上述结果说明 ,硼在Ca 蒙脱上的吸附为吸热过程 ,解吸为放热过程 ;硼在针铁矿、水锰矿上的吸附为放热过程 ,解吸为吸热过程。随着温度的升高 ,硼与矿物的初始反应速率明显加快 ,而整体反应速率略有下降。
In the laboratory, the natural Ca montmorillonite was purified, and goethite and manganite were artificially synthesized under certain conditions. Using this as experimental material, the effects of temperature on the adsorption of boron in Ca Montmorillonite, goethite, water manganese ore adsorption and desorption characteristics. The results showed that with the increase of temperature, the amount of boron adsorbed by Ca montmorillonite increased, and the desorption lag of boron decreased. The adsorption amount of boron by sorbite and goethite decreased, and the desorption lag of boron increased. The calculated results show that the adsorption heat of boron on Ca montmorillonite is 63.0 8kJmol-1 at room temperature, -122.45 and -93.91kJmol-1 on goethite and manganite respectively, The desorption heat on goethite, goethite and manganite were - 31 .0 2, 53 .95 and 46 .30 kJ mol-1, respectively. The above results indicate that the adsorption of boron on Ca montmorillonite is an endothermic process and the desorption is an exothermic process. The adsorption of boron on goethite and manganite is an exothermic process and the desorption is an endothermic process. With the increase of temperature, the initial reaction rate of boron and mineral significantly accelerated, while the overall reaction rate decreased slightly.