(中南大學(xué)資源加工與生物工程學(xué)院，長沙410083)
摘 要: 通過吸附量的測定、熱力學(xué)分析及單礦物浮選試驗，揭示溫度對油酸鈉在一水硬鋁石表面的吸附量及其浮選的影響。結(jié)果表明：在15 ℃時，油酸鈉在一水硬鋁石表面的吸附等溫線為L-S型吸附曲線；在32 ℃時，其為L型吸附曲線。初始濃度在2 mmol/L以下時，油酸鈉在一水硬鋁石表面為單分子層吸附，吸附熱約為-89.31 kJ/mol，屬化學(xué)吸附，32 ℃時的吸附量高于15 ℃時的， ＜ ，溫度的降低導(dǎo)致油酸鈉的吸附量減少，主要是油酸鈉的溶解度降低所致；低溫下，增加礦漿溫度比增大捕收劑用量能更有效地提高油酸鈉吸附量及浮選回收率。
關(guān)鍵字: 溫度；油酸鈉；吸附量；吸附熱力學(xué)
（School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China）
Abstract:The effects of temperature on the adsorption amount of on the surface of diaspore and its floatation efficiency were revealed by adsorption measurement, thermodynamical analysis and single mineral flotation. The results indicate that, when temperature is 15 ℃, the adsorption isotherm of sodium oleate on aluminum-silicate minerals is L-S type, while it transfers to L type when temperature is 32 ℃. When the initial concentration is less than 2 mmol/L, the adsorption of sodium oleate on diaspore is monolayer adsorption with about -89.31 kJ/mol adsorption heat, which belongs to the chemical adsorption. The adsorption quantity of sodium oleate at 32℃ is higher than that at 15 ℃. However, ＜ , it can be inferred that the decrease of the adsorption amount of sodium oleate might be caused by the reduced solubility of sodium oleate at low temperature. At low temperature, raising the pulp temperature is more effective than raising the collector dosage to improve the adsorption amount of sodium oleate and the recovery rate of diaspore flotation.
Key words: temperature; sodium oleate; adsorptionconcentration; adsorptionthermodynamics
