發(fā)布時(shí)間：2018-03-08 10:09

  本文選題：磁鐵礦　切入點(diǎn)：磁選工藝　出處：《西安建筑科技大學(xué)》2015年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：山東省某鐵礦位于山東省蒼山縣境內(nèi),探明地質(zhì)儲(chǔ)量為7500萬(wàn)噸,屬于“鞍山式”貧磁鐵礦。選礦比高達(dá)4.0以上,若采用常規(guī)的選礦方法必會(huì)產(chǎn)生高昂的選礦費(fèi)用,因此,根據(jù)鞍山式貧磁鐵礦的特點(diǎn),結(jié)合當(dāng)?shù)氐木唧w情況,研究適合該礦石特征的選礦工藝流程就具有重要的現(xiàn)實(shí)意義。根據(jù)工藝礦物學(xué)分析結(jié)果可知,該礦石中鐵礦物以磁性鐵為主,可選性較好,入磨前可采用干濕式磁選進(jìn)行預(yù)選拋廢,提高入磨品位。磨選系統(tǒng)采用單一磁選;由于有用礦物和脈石礦物顆粒都不均勻,故采用階段磨礦-階段選別流程,提前拋棄大量粗顆粒尾礦,減少進(jìn)入二段磨選的礦量,以降低選廠能耗、鋼耗等。由條件試驗(yàn)及全流程試驗(yàn)的結(jié)果可知,-75+12mm干式磁選、-12mm濕式預(yù)選可以提前拋棄全部入破量的22%以上,年節(jié)約780萬(wàn)元;采用階段磨礦-階段選別工藝流程一段磨礦細(xì)度55%-200目百分含量,經(jīng)一次磁選可拋棄全部入磨量的43%的合格尾礦,二段磨礦細(xì)度為80%-200目百分含量,經(jīng)二、三次連選可以獲得最終鐵精礦品位為65.20%的合格產(chǎn)品,為該礦周邊十多億噸同類(lèi)礦石的開(kāi)發(fā)利用探索出了一條可行之路。
[Abstract]:A certain iron ore in Shandong Province is located in Cangshan County, Shandong Province, with proved geological reserves of 75 million tons and belongs to "Anshan type" poor magnetite. The ore dressing ratio is as high as 4. 0. If conventional processing methods are adopted, there will be high mineral processing costs. According to the characteristics of Anshan type poor magnetite and the local specific conditions, it is of great practical significance to study the process flow suitable for the characteristics of the ore. The iron mineral in this ore is mainly magnetic iron, which has good separability. Before grinding, dry and wet magnetic separation can be used to pre-separate and discard the waste and improve the grinding grade. The grinding and separation system adopts a single magnetic separation system, because the useful minerals and gangue mineral particles are not uniform, Therefore, by adopting the process of stage grinding and stage separation, a large number of coarse grain tailings are discarded in advance, and the amount of ore entering the second stage grinding and separation is reduced, so as to reduce the energy consumption of the separation plant. According to the results of conditional test and whole process test, it can be seen that pre-dressing of dry magnetic separation of 75.12 mm and wet type of 12mm can give up more than 22% of the total breaking amount in advance and save 7.8 million yuan per year. The grinding fineness of the first section of the process of stage grinding and stage separation is 55% to 200 mesh content, and the qualified tailings of 43%% of the total amount of grinding can be discarded after the primary magnetic separation, the second stage grinding fineness is 80% -200 mesh content, 2%, The qualified product with final iron concentrate grade of 65.20% can be obtained by three successive separation, which provides a feasible way for the development and utilization of more than 1 billion tons of similar ore around the ore.
【學(xué)位授予單位】：西安建筑科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TD951

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本文編號(hào)：1583452