(1. 西南能礦集團(tuán)股份有限公司，貴陽(yáng) 550004；
2. 西安建筑科技大學(xué) 材料科學(xué)與工程學(xué)院，西安 710055；
3. 遵義能礦投資股份有限公司，遵義 563000)
摘 要: 提出了一種新的工藝路線—“閃爍焙燒+精礦拜耳法”，研究礦物物相變化和熱分析，對(duì)焙燒脫硫過(guò)程中的重要參數(shù)(焙燒溫度和焙燒時(shí)間)進(jìn)行系統(tǒng)優(yōu)化，全面提升焙燒精礦在拜耳法工藝中的溶出性能。結(jié)果表明：在活化焙燒溫度為550 ℃、爐內(nèi)停留時(shí)間為1.6 s的條件下，所得焙燒礦中硫化物型硫的平均質(zhì)量分?jǐn)?shù)約為0.05%，脫硫率達(dá)到95.2%，且后續(xù)溶出試驗(yàn)效果明顯優(yōu)于原礦的；在溶出溫度270 ℃、溶出時(shí)間60 min、石灰添加量14%、苛性堿質(zhì)量濃度245 g/L且配料苛性堿與氧化鋁的摩爾比為1.40的條件下，焙燒礦相對(duì)溶出率可達(dá)到95%以上，相比原礦的提高2%~3%。研究成果為加快推進(jìn)高硫鋁土礦的高效產(chǎn)業(yè)化利用提供了一種新工藝及相關(guān)基礎(chǔ)數(shù)據(jù)。
關(guān)鍵字: 高硫鋁土礦；閃爍焙燒；精礦拜爾法；脫硫率；溶出率
（1. Southwest Energy and Mineral Resources Corporation Co., Ltd., Guiyang 550004, China;
2. College of Materials Science and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China;
3. Zunyi Energy and Mineral Investment Co., Ltd., Zunyi 563000, China）
Abstract:In China, the potential reserves of high-sulfur bauxite deposits are 2 billion tons, but they were hard to be exploited in alumina industry at present due to the bad properties of sulfur, such as corrosion to machines, deterioration of dissolution of Al2O3. In this paper, a novel process route “flash roasting+concentrate Bayer process” was proposed. The key parameters of flash roasting (roasting temperature and time), phase transformation and the thermodynamics during roasting desulfurization process were analyzed. Digestion properties of roasted bauxite in “concentrate Bayer process” were further investigated. The results show that the S content decreases to approximately 0.05%, and the desulfurization rate reaches 95.2% when being roasted at 550 ℃ for 1.6 s. In the digestion experiment, the performance of the roasted ore is significantly better than that of raw ore. The Al2O3 relative dissolution rate of roasted ore exceeds 95%, which is 2%-3% higher than that of raw ore, at the following conditions: temperature of 270 ℃, CaO dosage of 14%, Na2Ok concentration of 245 g/L, duration of 60 min, and burdening αk 1.40. The study results propose a novel desulfurization process for accelerating the efficient industrial utilization of high-sulfur bauxite.
Key words: high-sulfur bauxite; flash roasting; concentrate Bayer process; desulfurization rate; dissolution rate
