本文選題：浮選 + 浮選柱　； 參考：《中國礦業(yè)大學(xué)》2015年碩士論文

【摘要】：隨著我國優(yōu)質(zhì)磁鐵礦資源儲量不斷減少,細(xì)粒嵌布復(fù)雜難選磁鐵礦石的開發(fā)利用變得越來越重要,而單一磁選工藝已很難適應(yīng)日益惡化的礦石性質(zhì),這都迫使選廠選擇合理工藝來生產(chǎn)優(yōu)質(zhì)鐵精礦。浮選具有磁選工藝無法比擬的優(yōu)勢,能有效剔除鐵精礦中夾帶的細(xì)粒脈石礦物及含硅的鐵礦物連生體,降低精礦中呈細(xì)粒嵌布的有害雜質(zhì)含量。安徽某鐵選廠采用階段磨選-細(xì)篩分級-中礦再磨再選單一磁選工藝對該地區(qū)磁鐵礦進(jìn)行分選,第二段和第三段磁精礦品位分別在56%和64%左右,隨著原礦性質(zhì)不斷變化,精礦品位波動較大,有時精礦品位只達(dá)到62%,而伴隨煉鋼廠對鐵精礦質(zhì)量的要求越來越高以及鐵精礦價格下跌導(dǎo)致選廠效益不佳等因素,該工藝已很難滿足現(xiàn)場需求,鐵精礦提質(zhì)重要性已日益凸顯。本文以安徽某選廠二段磁精礦為研究對象,結(jié)合單礦物試驗對安徽某選廠二段磁精礦進(jìn)行提質(zhì)試驗研究。單礦物試驗通過脂肪胺類捕收劑和醚胺類捕收劑GE-609,考察了捕收劑用量及礦漿p H值對石英及磁鐵礦單礦物可浮性影響,并對比了不同捕收劑捕收性能,試驗發(fā)現(xiàn),在低藥劑濃度下,脂肪胺類捕收劑捕收能力隨著碳鏈長度增加而下降,GE-609捕收性能較十二胺稍差,且十二胺和GE-609較其它三種捕收劑在捕收性及選擇性上較好。以十二胺為和GE-609為捕收劑,研究淀粉對石英和磁鐵礦可浮性影響及不同粒級石英反浮選效果,結(jié)果表明,淀粉對石英可浮性影響較小,而對磁鐵礦有一定抑制效果,低藥劑濃度下,石英可浮性隨著粒度增加而降低,高藥劑濃度下,-0.154+0.1mm中間粒級石英較-0.2+0.154mm和-0.1+0.03mm可浮性較好,而-0.1+0.03mm粒級石英隨著藥劑濃度增加回收率幾乎不變。實驗室試驗研究主要從礦樣性質(zhì)分析、實驗室浮選機(jī)試驗及實驗室浮選柱試驗三方面展開。以十二胺和GE-609為捕收劑,對比不同粒級礦物浮選效果,結(jié)果表明,十二胺捕收效果較GE-609好且-0.1mm粒級礦物浮選效果較好。以-0.1mm礦物作為浮選入料,進(jìn)行浮選機(jī)藥劑制度、礦漿等條件試驗、浮選機(jī)工藝流程和浮選柱浮選流程探索,試驗結(jié)果表明,采用浮選機(jī)一粗兩精開路和浮選柱一粗一精浮選流程,均能獲得品位67%以上的浮選鐵精礦。采用分級-浮選-磁選工藝對該選廠二段磁精礦進(jìn)行提質(zhì),對浮選泡沫及篩上粗顆粒這部分中礦,進(jìn)行磨礦細(xì)度及磁場強(qiáng)度條件試驗,并對分級-浮選機(jī)浮選-磁選和分級-浮選柱浮選-磁選提質(zhì)工藝進(jìn)行對比,結(jié)果表明,浮選柱一粗一精閉路浮選-中礦再磨磁選提質(zhì)工藝總精礦產(chǎn)率和回收率最高,入磨中礦量是最少的,且相比于浮選機(jī),浮選柱具有簡化流程、對細(xì)粒級礦物分選指標(biāo)好的優(yōu)勢,因此,選擇分級-浮選柱一粗一精閉路浮選-中礦再磨磁選工藝作為最終鐵精礦提質(zhì)工藝,可獲得總精礦產(chǎn)率67.02%、品位67.02%、回收率94.07%的良好指標(biāo)。
[Abstract]:With the decrease of high quality magnetite reserves in China, the development and utilization of fine grained complex refractory magnetite has become more and more important, and the single magnetic separation process has been difficult to adapt to the deteriorating ore properties. This forced the separation plant to choose a reasonable process to produce high-quality iron concentrate. Flotation has the advantage that the magnetic separation technology can not be compared, can effectively eliminate fine gangue minerals and iron mineral conjunctions containing silicon in iron concentrate, and reduce the harmful impurity content of fine particles embedded in the concentrate. In a certain iron separation plant in Anhui Province, the single magnetic separation process of stage grinding, fine sifting and classifying of middle ore is used to separate magnetite in this area. The grade of the second and third stages of magnetic concentrate is about 56% and 64%, respectively, with the change of raw ore properties. The concentrate grade fluctuates greatly, sometimes the concentrate grade only reaches 62%, but with the higher and higher demand for the iron concentrate quality in the steelmaking plant and the low price of the iron concentrate, it is difficult to meet the field demand. The importance of improving quality of iron concentrate has become increasingly prominent. In this paper, the second stage magnetic concentrate of a certain dressing plant in Anhui Province is taken as the research object, and a single mineral test is used to study the quality improvement of the second stage magnetic concentrate of a certain dressing plant in Anhui Province. The effects of the amount of collector and pH value of pulp on the floatability of single mineral in quartz and magnetite were investigated by using adipose amine collector and ether amine collector GE-609. At low concentration, the capture ability of aliphatic amines decreased with the increase of carbon chain length, and the capture performance of GE-609 was slightly worse than that of dodecylamine, and that of dodecylamine and GE-609 was better than that of the other three kinds of collectors. Using dodecylamine as collector and GE-609 as collector, the effect of starch on floatability of quartz and magnetite and reverse floatation of quartz at different grain levels were studied. The results showed that starch had little effect on floatability of quartz, but had certain inhibitory effect on magnetite. At low concentration, the floatability of quartz decreases with the increase of particle size. At high concentration, the floatability of intermediate grade quartz of 0.154 0.1mm is better than that of -0.2 0.154mm and -0.1 0.03mm, while the recovery rate of -0.1 0.03mm grade quartz is almost unchanged with the increase of concentration. The laboratory test is mainly carried out from three aspects: the analysis of the ore sample, the laboratory flotation machine test and the laboratory flotation column test. Using dodecylamine and GE-609 as collectors, the flotation effects of different grain-grade minerals were compared. The results showed that dodecylamine was better than GE-609 and had a better flotation effect of -0.1mm. Using -0.1mm mineral as flotation feed, the flotation machine reagent system, pulp and other conditions were tested, flotation machine technological process and flotation column flotation process were explored. The experimental results showed that, Floatation iron concentrate with more than 67% grade can be obtained by floatation process of floatation machine with one coarse and two fine fineness and flotation column with one coarse and one fine floatation. In this paper, the secondary magnetic concentrate of the separation plant was extracted by the technology of class-floatation-magnetic separation, and the grinding fineness and magnetic field intensity conditions were tested for the flotation foam and the coarse particles on the screen. The results show that the total concentrate yield and recovery rate are the highest in the flotation column floatation-magnetic separation process, the closed circuit floatation-fine flotation process and the regrinding magnetic separation process for middle ore, and the results show that the total concentrate yield and recovery rate are the highest in the process of flotation, magnetic separation and separation with the classifier and flotation machine, and the results show that the total concentrate yield and recovery rate are the highest. Compared with flotation machine, flotation column has the advantages of simplified flow and good separation index for fine grained minerals. By selecting the classification-floatation-finely closed circuit floatation-middle ore regrinding magnetic separation process as the final iron concentrate extraction process, a good index of total concentrate yield of 67.02, grade of 67.02 and recovery of 94.07% can be obtained.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TD951

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