(中南大學(xué) 冶金科學(xué)與工程學(xué)院，長沙 410083)
摘 要: 針對(duì)石煤提釩常壓硫酸浸出能耗高、作業(yè)周期長的缺陷，提出石煤低溫硫酸化焙燒礦物分解新工藝。以貴州凱里石煤為原料，對(duì)石煤低溫硫酸化焙燒的時(shí)間、焙燒溫度、硫酸加入量以及焙砂水浸工藝參數(shù)進(jìn)行研究。結(jié)果表明：先對(duì)石煤進(jìn)行低溫硫酸化焙燒處理，再將焙砂按液固比1.2 mL/g加水于100 ℃下攪拌浸出2 h，釩的浸出率可達(dá)78.2%；而在相同酸礦比和固液比的條件下，采用常壓直接酸浸石煤時(shí)，在100 ℃下攪拌浸出48 h后，釩的浸出率只有67.8%。石煤通過低溫硫酸化焙燒可有效強(qiáng)化礦物分解過程，縮短提釩作業(yè)周期，提高酸的利用率及釩的浸出率。
關(guān)鍵字: 釩；石煤；礦物分解；硫酸化焙燒
stone coal by low temperature sulphating roasting
（School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China）
Abstract: The new mineral decomposition process of vanadium recovery from stone coal by low temperature sulphating roasting was proposed, which overcomes the shortages of high energy consumption and long working cycle existing in stone coal decomposition with sulfuric acid solution under normal atmosphere. Using the stone coal obtained from Kaili of Guizhou Province, China, as raw material, the process parameters, such as roasting time, roasting temperature, sulfuric acid addition volume and the leaching with water for the calcine, were investigated. The results show that when the stone coal is firstly treated by low temperature sulphating roasting, then the obtained calcine is leached in water with liquid-to-solid ratio of 1.2 mL/g at 100 ℃ for 2 h, the leaching rate of vanadium is 78.2%. However, when the stone coal is leached with the same sulfuric acid addition and the same liquid-to-solid ratio under normal atmosphere at 100 ℃ for 48 h, the leaching rate of vanadium is only 67.8%. The process of low temperature sulphating roasting can effectively enhance the mineral decomposition of stone coal, which shortens the working cycle of vanadium recovery from stone coal and increases the utilization ratio of sulfuric acid and vanadium leaching rate.
Key words: vanadium; stone coal; mineral decomposition; sulphating roasting
