【摘要】：鞍鋼集團(tuán)弓長(zhǎng)嶺選礦廠(chǎng)浮選車(chē)間入選礦石類(lèi)型為鞍山式赤鐵礦,其主要流程為弱磁-強(qiáng)磁-反浮選,混磁精礦反浮選后得到鐵精礦產(chǎn)品。經(jīng)“兩粗-一精-三掃”反浮選作業(yè)后,反浮選尾礦的鐵品位依然高達(dá)16%以上,尾礦中以細(xì)粒及微細(xì)粒的損失為主,作為短期內(nèi)不可替代的礦產(chǎn)資源,損失和浪費(fèi)嚴(yán)重。本文以弓長(zhǎng)嶺選礦廠(chǎng)反浮選尾礦為試驗(yàn)對(duì)象,進(jìn)行鐵礦物二次分選的試驗(yàn)研究。通過(guò)對(duì)入選原料的性質(zhì)分析得出:原礦鐵品位為16.65%,有用礦物主要有赤鐵礦、磁鐵礦等,脈石礦物以石英為主;原礦粒度組成適中但鐵礦物分布不均,-38μm粒級(jí)產(chǎn)率34.02%、品位29.87%,金屬分布率高達(dá)61.04%,可見(jiàn)對(duì)-38μm粒級(jí)中鐵礦物的回收是提高試驗(yàn)鐵回收率的關(guān)鍵。根據(jù)原礦性質(zhì)分析并結(jié)合鞍山式赤鐵礦的選別現(xiàn)狀,初步擬定了“磁選富集-浮選提純”的試驗(yàn)方案。在初步探索性試驗(yàn)的基礎(chǔ)上,擬定了“磨礦-強(qiáng)磁-中磁”和“粗磨-強(qiáng)磁-細(xì)磨-中磁”兩種磁選富集的方案,并對(duì)磨礦細(xì)度、磁場(chǎng)強(qiáng)度等對(duì)磁選效果有重要影響的參數(shù)進(jìn)行了條件試驗(yàn)。綜合考慮回收效果、運(yùn)行成本等因素,磁選富集段選用一段磨礦流程,此時(shí)可得到回收率為81.05%,鐵品位為41.71%的磁精礦,磁選尾礦品位僅4.66%。對(duì)磁精礦進(jìn)行反浮選提純作業(yè),使用浮選機(jī)和浮選柱兩種設(shè)備進(jìn)行對(duì)比,確定了最佳的藥劑用量、設(shè)備參數(shù)及各自的工藝流程。試驗(yàn)表明,在入浮品位為41.71%的情況下,經(jīng)過(guò)浮選柱一粗一精一掃閉路作業(yè),可得到品位為64.56%、浮選作業(yè)回收率為87.30%的鐵精礦,比浮選機(jī)一粗兩精兩掃閉路作業(yè)得到的精礦品位和作業(yè)回收率分別高出0.52和1.12個(gè)百分點(diǎn)。實(shí)驗(yàn)室全流程數(shù)質(zhì)量流程表明弓長(zhǎng)嶺選礦廠(chǎng)反浮選尾礦經(jīng)“細(xì)磨-強(qiáng)磁-中磁-浮選柱一粗一精一掃反浮選”工藝,鐵礦物得到有效回收。在二次分選原礦品位為16.65%的情況下,得到最終精礦品位為64.56%,全流程回收率達(dá)到70.76%,二次分選尾礦品位僅5.96%。由于半工業(yè)二次分選試驗(yàn)過(guò)程中出現(xiàn)強(qiáng)磁機(jī)堵塞現(xiàn)象,故將磁選富集段流程改為“弱磁-強(qiáng)磁”工藝。試驗(yàn)表明磨礦細(xì)度對(duì)二次分選系統(tǒng)效果有較大影響,因磁選流程及設(shè)備原因,半工業(yè)系統(tǒng)磁選尾礦品位遠(yuǎn)高于實(shí)驗(yàn)室試驗(yàn)中磁選尾礦品位。連續(xù)穩(wěn)定試驗(yàn)結(jié)果表明,在原礦平均品位為17.94%條件下,經(jīng)“磨礦分級(jí)-弱磁-強(qiáng)磁-浮選柱一粗一精一掃反浮選”流程后,得到品位為63.12%,全流程回收率為50.17%的最終精礦,全流程綜合尾礦品位為10.43%。
[Abstract]:The ore type in flotation workshop of Gongchangling Concentrator of Angang Group is Anshan hematite, the main process is weak magnetic field, strong magnetic field reverse flotation, and iron concentrate product is obtained after reverse flotation of mixed magnetic concentrate. After the operation of "two coarse-one fine-three sweep" reverse flotation, the iron grade of tailings is still up to 16%. The loss of fine particles and fine particles is the main loss in tailings, which is an irreplaceable mineral resource in a short period of time. The loss and waste are serious. In this paper, the tailings of reverse flotation in Gongchangling Concentrator are taken as experimental objects, and the secondary separation of iron minerals is studied. By analyzing the properties of raw materials, it is concluded that the iron grade of raw ore is 16.65, the useful minerals are mainly hematite and magnetite, and the gangue minerals are mainly quartz; The ore size composition is moderate but the iron mineral distribution is uneven. The yield of -38 渭 m grain-grade is 34.02, the grade is 29.87 and the distribution rate of metal is as high as 61.04. It can be seen that the recovery of iron minerals in -38 渭 m grain-grade is the key to increase the recovery rate of tested iron. Based on the analysis of the properties of raw ore and the present situation of hematite separation in Anshan, the experimental scheme of "magnetic separation enrichment-flotation purification" was preliminarily drawn up. On the basis of preliminary exploratory test, two schemes of "grinding-strong magnetic-medium magnetic" and "coarse grinding-strong magnetic-fine grinding-medium magnetic" have been worked out, and the grinding fineness has been studied. The conditional tests were carried out on the parameters which have important influence on the magnetic separation effect, such as the magnetic field intensity. Considering the recovery effect, operation cost and other factors, the magnetic concentrate with recovery rate of 81.05%, iron grade of 41.71% and tailings grade of magnetic separation only 4.66 can be obtained by selecting one stage grinding process in the enrichment section of magnetic separation. The magnetic concentrate was purified by reverse flotation. The optimum dosage of the reagent, the parameters of the equipment and the respective technological process were determined by comparing the flotation machine with the flotation column. The results show that when the floatation grade is 41.71%, the iron concentrate with a grade of 64.56 and a recovery rate of 87.30% can be obtained by closed circuit operation. Compared with flotation machine, the concentrate grade and operation recovery are 0.52% and 1.12% higher than those obtained by closed circuit operation of one, two fine and two sweep flotation machines, respectively. The number and quality flow of laboratory whole process shows that iron minerals are recovered effectively by "fine grinding-strong magnetic-medium magnetic-flotation column-coarse-fine-sweep reverse flotation" process in reverse flotation tailings of Gongchangling Concentrator. When the grade of secondary separation is 16.65%, the final grade of concentrate is 64.56, the recovery rate of the whole process is 70.76, and the grade of secondary separation tailings is only 5.96. Due to the phenomenon of strong magnetic machine clogging in semi-industrial secondary separation test, the process of magnetic separation enrichment section is changed to "weak magnetic field and strong magnetic field" process. The results show that the grinding fineness has a great influence on the secondary separation system. Due to the process of magnetic separation and equipment, the tailings grade of the semi-industrial system is much higher than that of the magnetic separation tailings in laboratory tests. The results of continuous stability test show that under the condition of the average grade of raw ore being 17.94%, the final concentrate with a grade of 63.12 and a recovery rate of 50.17% is obtained by the process of "grinding classification, weak magnetic strength, strong magnetic flotation column, coarse, fine and reverse flotation". The comprehensive tailing grade of the whole process is 10.43.
【學(xué)位授予單位】：中國(guó)礦業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TD951

【引證文獻(xiàn)】

相關(guān)會(huì)議論文 前1條

1 魏德洲;高淑玲;;鐵礦石選礦技術(shù)進(jìn)展[A];2008年全國(guó)金屬礦山難選礦及低品位礦選礦新技術(shù)學(xué)術(shù)研討與技術(shù)成果交流暨設(shè)備展示會(huì)論文集[C];2008年

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本文編號(hào)：2261827