(1. 武漢科技大學(xué) 資源與環(huán)境工程學(xué)院，武漢 430081；
2. 冶金礦產(chǎn)資源高效利用與造塊湖北省重點實驗室，武漢 430081)
摘 要: 為了提高細粒級含釩頁巖的釩浸出率，研究了四種無機分散劑及其添加量對含釩頁巖中釩浸出的影響。采用激光粒度分析、實時在線顆粒錄像監(jiān)測、礦漿黏度測定、Zeta電位和紅外圖譜等手段進行表征。結(jié)果表明：當硫酸濃度為8.0%、液固比為1.5:1 mL/g、浸出溫度為95 ℃、浸出時間為4 h時，添加1.0%(質(zhì)量分數(shù))的三聚磷酸鈉(STPP)可使細粒級含釩頁巖的釩浸出率由無分散劑時的62.0%提高到72.1%。微細粒含釩頁巖的浸出反應(yīng)速率受界面遷移和內(nèi)擴散共同控制，分散劑通過改變礦物表面Zeta電位使顆粒間黏滯力減小，從而降低礦漿黏度來強化釩的浸出。加入STPP后，礦漿黏度從564 mPa·s降至294 mPa·s；礦漿黏度降低和分散劑吸附是影響釩浸出率的主要因素，添加適量分散劑有利于細粒級含釩頁巖釩的浸出反應(yīng)。
關(guān)鍵字: 細粒級；含釩頁巖；分散劑；強化浸出；礦漿黏度
（1. College of Resources and Environment Engineering, Wuhan University of Science and Technology, Wuhan 430081, China;
2. Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgic Mineral Resources, Wuhan 430081, China）
Abstract:In order to improve the vanadium leaching rate of fine-grained vanadium-bearing shale, the effects of four inorganic dispersants and their additions on the vanadium leaching from vanadium-bearing shale were studied. The samples were characterized by laser particle size analysis, real-time online particle video monitoring (PVM), ore pulp viscosity measurement, Zeta potential and Fourier transformation infrared spectroscopy (FTIR). The results show that, when the sulfuric acid concentration is 8.0% (volume fraction), the liquid-to-solid ratio is 1.5:1 mL/g, the leaching temperature is 95°C and the leaching time is 4 h, adding 1.0% (mass fraction) of sodium tripolyphosphate (STPP) can increase the vanadium leaching rate of fine-grained vanadium-bearing shale from 62.0% that without adding STPP to 72.1%. The leaching reaction rate is controlled by the interface transfer and internal diffusion across the product layer. By changing the Zeta potential of the mineral surface, the dispersant reduces the viscous force between particles and the viscosity of ore pulp to strengthen the vanadium leaching. The viscosity of ore pulp decreases from 564 mPa·s to 294 mPa·s after adding STPP. The decrease of viscosity of ore pulp and dispersant adsorption are the main factors affecting the vanadium leaching rate, and a proper amount of dispersant is beneficial to the leaching reaction of fine-grained vanadium-bearing shale.
Key words: fine-grained; vanadium-bearing shale; dispersant; enhanced leaching; ore pulp viscosity
