(1. 西南科技大學(xué) 固體廢物處理與資源化教育部重點(diǎn)實(shí)驗(yàn)室，綿陽 621010；
2. 中南大學(xué) 資源與生物工程學(xué)院，長沙 410083)
摘 要: 基于鋰輝石與綠柱石和長石等鋁硅酸鹽礦物的表面皆含有活性Al原子，表面晶體化學(xué)特性是產(chǎn)生選擇性浮選分離的決定性因素，通過不同粒級(jí)單礦物浮選實(shí)驗(yàn)、Zeta電位測(cè)試、紅外光譜分析、密度泛函理論計(jì)算及分子動(dòng)力學(xué)模擬等方法系統(tǒng)研究油酸鈉浮選鋰輝石的表面晶體化學(xué)及各向異性。結(jié)果表明：鋰輝石浮選回收率隨pH增大先增加而后減小，當(dāng)pH=8.5左右，浮選回收率達(dá)到最大值；在一定粒度范圍內(nèi)，粒度越粗，鋰輝石浮選回收率越高；鋰輝石表面Al質(zhì)點(diǎn)與油酸鈉發(fā)生化學(xué)吸附作用；鋰輝石晶面單位面積的斷裂鍵數(shù)以及與油酸鈉的相互作用能由大到小依次為(110)、(001)，其是導(dǎo)致不同粒級(jí)鋰輝石浮選行為差異性的根本原因。
關(guān)鍵字: 鋰輝石；油酸鈉；各向異性；表面晶體化學(xué)；斷裂鍵；浮選
（1. Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education,
Southwest University of Science and Technology, Mianyang 621010, China;
2. School of Resources Processing and Bioengineering, Central South University, Changsha 410083, China）
Abstract:Due to the same active Al atoms contained by spodumene, beryl and feldspar, the characteristic surface crystal chemistry of minerals was found to be the major contributing factor for the selectivity flotation separation. The surface crystal chemistry and anisotropy of spodumene flotation with sodium oleate were studied using single mineral flotation tests, zeta potential measurements, infrared spectral analysis, density functional theory calculation and molecular dynamics simulation. The results show that the flotation recovery rate first increases, but then decreases with the increasing pH. When the pH=8.5, the flotation recovery rate reaches maximum value. In the appropriate particle size range, particle size is much more coarse, the flotation recovery is higher, which shows Al sites on the surface of minerals react with NaOL by chemisorption. The order of the surface broken bond densities of the spodumene crystal planes and interaction energy with NaOL is (110), (001), which is a leading cause of the difference flotation behavior of spodumene in different particle size fractions.
Key words: spodumene; sodium oleate; anisotropy; surface crystal chemistry; broken bond; flotation
