(1. 北京科技大學(xué) 土木與環(huán)境工程學(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: 研究十二胺浮選分離菱錳礦與方解石的行為，考察調(diào)整劑水玻璃、六偏磷酸鈉和檸檬酸對(duì)菱錳礦和方解石浮選的影響。單礦物浮選結(jié)果表明：pH為7~8時(shí)，菱錳礦與方解石可浮性存在差異。人工混合礦浮選結(jié)果表明，菱錳礦與方解石可浮性相當(dāng)，難以分離。紅外分析結(jié)果顯示，十二胺以物理吸附方式存在于菱錳礦與方解石表面。礦物晶格能、溶液化學(xué)計(jì)算和SEM-EDS表明，方解石的可浮性略大于菱錳礦的，混合礦中方解石表面向菱錳礦轉(zhuǎn)化，導(dǎo)致兩礦樣表面性質(zhì)相似而不可分離。
關(guān)鍵字: 菱錳礦；方解石；浮選；十二胺；水玻璃；六偏磷酸鈉
（1. School of Civil and Environment Engineering, University of Science and Technology Beijing, Beijing 100083, China;
2. State Key Laboratory of Biochemical Engineering, Institute of Process Engineering,
Chinese Academy of Sciences, Beijing 100190, China）
Abstract:The flotation separation of rhodochrosite from calcite was studied, and the effects of sodium silicate, sodium hexametaphosphate and citric acid on the flotation separation of rhodochrosite from calcite were investigated through flotation tests. The flotation tests results of single mineral show that the floatability of rhodochrosite and calcite are different in pH range of 7-8. The flotation tests results of mixed mineral show that it is difficult to achieve the flotation separation of rhodochrosite from calcite. The FTIR measurements results indicate that dodecylamine can adsorb on the surfaces of rhodochrosite and calcite by physical adsorption. According to the lattice energy, solution chemistry calculation and SEM-EDS analysis, the flotability of calcite is stronger than that of rhodochrosite, the two minerals surface properties tend to be similar because the amount of Mn2+ dissolved from rhodochrosite is so great enough that it leads to the precipitation of MnCO3 on calcite surface.
Key words: rhodochrosite; calcite; flotation; dodecylamine; sodium silicate; sodium hexametaphosphate
