(1. 北京科技大學(xué) 土木與資源工程學(xué)院，北京 100083； 2. 中國(guó)科學(xué)院過(guò)程工程研究所 生化工程國(guó)家重點(diǎn)實(shí)驗(yàn)室，北京 100190)
摘 要: 從釩氧化角度研究復(fù)合鈉鹽對(duì)硅質(zhì)頁(yè)巖提釩的強(qiáng)化及協(xié)同作用。結(jié)果表明：Na2CO3在復(fù)合鈉鹽中的添加量小于復(fù)合鹽總質(zhì)量的40%時(shí)，與NaCl共同促進(jìn)長(zhǎng)石生成和消耗的過(guò)程，并進(jìn)一步促進(jìn)釩加速氧化，產(chǎn)生正向協(xié)同作用并使釩氧化率提高。Na2SO4在復(fù)合鹽中所占比例的改變對(duì)釩氧化影響不明顯，且與NaCl和Na2CO3無(wú)明顯協(xié)同作用，可加入20%~40% Na2SO4代替NaCl。Na2CO3和Na2SO4作為替代品最多可使焙燒添加劑中NaCl的用量減少60%左右。要保證焙燒產(chǎn)物中釩氧化率大于70%，復(fù)合添加劑中3種鹽添加量由大至小的順序應(yīng)遵循NaCl、Na2CO3、Na2SO4的原則。將混料實(shí)驗(yàn)得到的焙燒產(chǎn)物釩氧化率采用特殊三次方模型擬合優(yōu)化，得到的最優(yōu)方案如下，NaCl添加量4.96%，Na2CO3添加量2.71%，Na2SO4添加量2.33%，此時(shí)產(chǎn)物釩氧化率達(dá)71.56%。
關(guān)鍵字: 硅質(zhì)頁(yè)巖；復(fù)合鈉鹽；釩氧化；添加劑
（1. School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China; 2. National Key State Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China）
Abstract:The synergistic and strengthen effect of composite sodium salt on vanadium extraction from siliceous shale of roasting were investigated. The results show that, when the added amount of Na2CO3 is less than 40% of the total mass of the composite sodium salt, Na2CO3 and NaCl will jointly promote the formation and consumption of feldspar. The change of Na2SO4 content of composite salts has no obvious effect on vanadium oxidation. It can be added with 20%-40% Na2SO4 in composite salts in place of NaCl. Without reducing vanadium oxidation rate, the two salts can replace up to 60% NaCl. To get more than 70% of vanadium oxidation rate, the order for content with each salt in composite salts from high to low should follow the principle of NaCl, Na2CO3, Na2SO4. The special cubic model was used to optimize the vanadium oxidation rate. The results show that with 4.96% (mass fraction) NaCl, 2.33% Na2SO4 and 2.71% Na2CO3, vanadium oxidation rate is 71.56%.
Key words: siliceous shale; composite sodium salt; vanadium oxidation; additive
