(武漢理工大學(xué) 資源與環(huán)境工程學(xué)院，武漢 430070)
摘 要: 通過單礦物浮選試驗(yàn)，考察鈣離子在pH為3~9的浮選條件下對(duì)十二胺浮選紅柱石的影響。通過對(duì)鈣離子溶液化學(xué)分析和采用波耳茲曼理論計(jì)算紅柱石表面捕收劑離子濃度變化，探討鈣離子對(duì)紅柱石浮選的抑制機(jī)理。結(jié)果表明:3≤pH≤7時(shí)，鈣離子對(duì)紅柱石具有較強(qiáng)的抑制作用；7＜pH≤9時(shí)，鈣離子的抑制作用逐漸減弱；3≤pH≤7時(shí)，鈣離子主要以Ca2+組分形式存在，在紅柱石礦物表面吸附后降低了其表面負(fù)電性，使十二胺的靜電吸附力減弱，此時(shí)界面層內(nèi)RNH3+的濃度均小于液相內(nèi)部RNH3+的濃度，鈣離子對(duì)紅柱石具有較強(qiáng)的抑制作用；7＜pH≤9時(shí)，CaOH+ 組分濃度較低，活化作用并不強(qiáng)烈，只是在一定程度上減弱了Ca2+組分的抑制作用，此時(shí)界面層內(nèi)RNH3+的濃度大于液相內(nèi)部RNH3+的濃度，鈣離子的抑制作用逐漸減弱。
關(guān)鍵字: 鈣離子；十二胺；紅柱石；浮選；溶液化學(xué)
（College of Resourceful and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China）
Abstract:Through single mineral flotation test, the effect of calcium ion on flotation system of andalusite-dodecylamine was studied under the flotation conditions of pH=3-9. Through solution chemical analysis of calcium ion and the use of Boltzmann theory calculating the collector ion concentration in andalusite surface, the inhibition mechanism of calcium ion to andalusite flotation was discussed. The results show that calcium ion has a strong inhibition to andalusite when the pH is in rage of 3-7 and inhibition of calcium ion is waning when the pH is in rage of 7-9. When the pH is in rage of 3-7, the major component of calcium ion is the form of Ca2+, after adsorption in andalusite mineral surface, its surface potential decreases, the electrostatic adsorption force of dodecylamine decreases, at this time, the RNH3+ concentration in interfacial layer is less than the RNH3+ concentration inside liquid, calcium ion has a strong inhibition to andalusite. When the pH is in rage of 7-9, the component concentration of CaOH+ is lower, and the activation is not strong, only the inhibition of Ca2+ component is reduced, at this time the RNH3+ concentration in interfacial layer is more than the RNH3+ concentration inside liquid, the inhibition of calcium ion is waning.
Key words: calcium ion; dodecylamine; andalusite; flotation; solution chemistry
