本文選題：石英浮選 + 吸附量��； 參考：《貴州大學(xué)》2015年碩士論文

【摘要】：以織金含稀土硅鈣質(zhì)磷礦石中石英為研究對(duì)象,采用胺類混合捕收劑HAY作為浮選捕收劑,進(jìn)行礦漿中難免離子對(duì)石英和膠磷礦浮選影響試驗(yàn)研究,采用吸附量測定、Zeta-電位測試、溶液化學(xué)計(jì)算、紅外光譜分析、分子模擬等方法進(jìn)行機(jī)理研究以及探討石英表面特性與浮選之間的關(guān)系。根據(jù)磷礦礦漿中的溶液離子和外加離子,考察金屬陽離子Ca2+、Mg2+、Al3+、Fe3+、Fe2+,無機(jī)陰離子SO42-、CO32-、PO43-、SiO32-、F-及離子交互作用對(duì)石英和膠磷礦浮選的影響。試驗(yàn)結(jié)果表明,當(dāng)?shù)V漿中無難免離子時(shí),HAY與石英表面硅氧鍵的氧主要以靜電力形式結(jié)合發(fā)生物理吸附,而HAY與膠磷礦表面的鈣離子發(fā)生絡(luò)合而產(chǎn)生化學(xué)吸附;當(dāng)?shù)V漿中存在難免離子時(shí),濃度低于35 mg/L的溶液離子對(duì)石英和膠磷礦浮選無明顯影響,當(dāng)離子濃度為50 mg/L時(shí),石英浮選回收率具有明顯變化。金屬陽離子對(duì)石英浮選影響大小為:Fe3+Fe2+Al3+Ca2+Mg2+,無機(jī)陰離子對(duì)石英浮選影響大小為:SO42-SiO32-F-CO32-PO43-;在陰離子和陽離子交互作用下,Ca2+與無機(jī)陰離子交互作用對(duì)石英浮選影響類似于無機(jī)陰離子,在Fe3+和Fe2+體系下,SO42-、F-可降低Fe3+和Fe2+對(duì)石英和膠磷礦浮選分離的影響,而PO43-可促進(jìn)Fe3+和Fe2+對(duì)石英和膠磷礦浮選分離的影響,當(dāng)pH為3時(shí),兩者浮選差異可達(dá)到60%以上;在陽離子和陽離子交互作用下,石英和膠磷礦浮選差異減小。通過表面HAY吸附量測定、Zeta-電位測試、金屬離子溶液化學(xué)計(jì)算、紅外光譜分析、分子模擬等方法,對(duì)礦物浮選過程進(jìn)行機(jī)理研究,研究結(jié)果與純礦物浮選試驗(yàn)結(jié)果相一致。Ca2+、Mg2+可提高石英表面吸附活性點(diǎn),提高石英浮選回收率;Fe3+、Fe2+與HAY能形成穩(wěn)定螯合物,降低石英浮選回收率;Al3+吸附于石英Stern層,改變石英表面電性,使HAY難以吸附于石英表面,降低石英浮選回收率;SiO32-吸附在石英表面,降低表面吸附活性點(diǎn),降低石英浮選回收率;F-與HAY發(fā)生絡(luò)合,降低HAY濃度,降低表面疏水性,降低石英浮選回收率;SO42-、CO32-、PO43-能與帶正電的HAY發(fā)生結(jié)合,降低石英表面HAY吸附量,降低石英浮選回收率。通過浮選試驗(yàn)和機(jī)理研究,考察了磷礦石中難免離子對(duì)石英浮選的影響,揭示了石英表面特性與之間的關(guān)系。
[Abstract]:In this paper, quartz in silicon-calcium phosphate ores containing rare earths in Zhijin was studied, and HAY was used as flotation collector. The effect of inevitable ions in slurry on flotation of quartz and colloid phosphate was studied, and Zeta-potential was measured by adsorption. The mechanism of solution chemistry calculation, infrared spectrum analysis and molecular simulation were studied and the relationship between surface characteristics of quartz and flotation was discussed. Based on the solution ions and applied ions in phosphate ore pulp, the effects of metal cationic Ca2 Mg2, Al 3, Fe 3 and Fe 2, inorganic anions so 4 2, CO 32, O 3, O 3, O 32, O 32, F -, and the interaction of ions on the flotation of quartz and carophosphate were investigated. The experimental results show that when there are no inevitable ions in the slurry, the oxygen of Si-O bond on quartz surface is mainly physically adsorbed in the form of static electricity, while HAY complexes with calcium ions on the surface of colloid phosphate to produce chemisorption. When there are inevitable ions in the slurry, the concentration of solution ions below 35 mg/L has no obvious influence on the flotation of quartz and colloid phosphate rock. When the concentration of ions is 50 mg/L, the recovery rate of quartz floatation has obvious change. The effect of metal cations on quartz flotation is: Fe _ 3 Fe2 Al3 Ca2 Mg2, inorganic anions on quartz flotation is: so _ 42-SiO _ 32-F-CO32-PO _ 43-.The interaction of Ca ~ (2 +) and inorganic anions on quartz flotation is similar to that of inorganic anions under the interaction of anions and cations. In the system of Fe3 and Fe2, the effect of Fe3 and Fe2 on the flotation separation of quartz and apatite can be reduced, while PO43- can promote the effect of Fe3 and Fe2 on the flotation separation of quartz and anthracite. When pH is 3, the difference between them can reach more than 60%. Under the interaction of cations and cations, the difference of flotation between quartz and cationic mineral is reduced. The mechanism of mineral flotation was studied by measuring the adsorption capacity of HAY on the surface, chemical calculation of metal ion solution, infrared spectrum analysis, molecular simulation and so on. The results are in agreement with the results of flotation test of pure minerals. The results show that Ca 2 + mg 2 can increase the surface adsorption activity point of quartz, increase the recovery rate of Fe 3 and Fe 2 in quartz flotation and form a stable chelate with HAY, and reduce the recovery rate of quartz flotation for Al 3 adsorption on quartz Stern layer. By changing the electrical properties of quartz surface, it is difficult for HAY to be adsorbed on quartz surface. SiO32- is adsorbed on quartz surface, and the surface adsorption activity point is reduced. The recovery rate of quartz floatation is reduced by complexing with HAY, and the concentration of HAY is reduced. The surface hydrophobicity of quartz was reduced, and the recovery rate of so _ 42-CO _ (32) O _ (32) O _ (43) could be combined with HAY with positive charge. The adsorption capacity of HAY on quartz surface was reduced, and the recovery rate of quartz flotation was decreased. The effect of inevitable ions in phosphate rock on the flotation of quartz was investigated through flotation experiments and mechanism studies. The relationship between surface characteristics and quartz surface characteristics was revealed.
【學(xué)位授予單位】：貴州大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TD97

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本文編號(hào)：1882085