發(fā)布時(shí)間：2018-08-30 16:44

【摘要】：隨著我國(guó)鋼鐵行業(yè)的快速發(fā)展,國(guó)內(nèi)對(duì)鐵礦石的需求越來越大,而進(jìn)口鐵礦石價(jià)格居高不下,嚴(yán)重制約了鋼鐵產(chǎn)業(yè)的健康發(fā)展。加強(qiáng)我國(guó)鐵礦石的開發(fā)利用,對(duì)鋼鐵產(chǎn)業(yè)的可持續(xù)發(fā)展具有重要作用。玉溪大紅山礦業(yè)有限公司開發(fā)的鐵礦礦產(chǎn)資源豐富,地質(zhì)儲(chǔ)量4.6億噸鐵礦石,平均地質(zhì)品位36%,是昆明鋼鐵集團(tuán)有限責(zé)任公司的主要鐵礦石原料基地。大紅山鐵礦屬于典型的古海相火山巖型鐵礦,礦體賦存條件復(fù)雜多樣,礦石性質(zhì)復(fù)雜,鐵礦物主要以微細(xì)粒的赤鐵礦及磁鐵礦為主,脈石礦物主要是硅酸鹽和石英類礦物,含鐵礦物嵌布粒度細(xì),使金屬鐵的分選、提質(zhì)和冶煉綜合回收利用帶來極大的困難。經(jīng)過近十年的開采,礦石性質(zhì)發(fā)生了很大變化,原礦鐵品位下降到35%左右,隨著生產(chǎn)的進(jìn)行,易選的磁鐵礦含量降低,難選的硅酸鐵礦物含量增加,礦石分離與富集難度明顯增大,2008年以前,大紅山鐵礦選礦總尾礦含鐵品位高達(dá)14%～15%,損失在尾礦中的鐵金屬量巨大；同時(shí),鐵精礦中硅含量達(dá)到9%以上,造成后續(xù)冶煉成本的劇增。為了解決上述問題,實(shí)現(xiàn)礦產(chǎn)資源的綜合利用,從選礦技術(shù)改進(jìn)和尾礦綜合利用兩個(gè)方面著手,進(jìn)行了二段強(qiáng)磁精礦的提質(zhì)降硅試驗(yàn)研究、二段強(qiáng)磁尾礦降尾試驗(yàn)研究、一段強(qiáng)磁尾礦降尾試驗(yàn)研究和總尾礦繼續(xù)降尾的試驗(yàn)研究。試驗(yàn)結(jié)果表明：(1)離心機(jī)對(duì)二段強(qiáng)磁精礦提質(zhì)降硅有較好的效果。當(dāng)給礦濃度在18%～26%之間時(shí),品位為51%～55%的原礦通過離心機(jī)分選,可得到產(chǎn)率為57%～64%、回收率為71%～78%、品位高達(dá)64%～66%、SiO2含量降至4%左右的精礦。(2)二段強(qiáng)磁尾礦降鐵采用強(qiáng)磁-離心機(jī)-搖床聯(lián)合流程方案,可將二段強(qiáng)磁尾礦品位由26%～28%降至12.53%。(3)一段強(qiáng)磁尾礦降鐵采用一粗一精一掃磁-重聯(lián)合流程方案,可獲得品位、產(chǎn)率分別為42.32%、37.72%的鐵精礦,尾礦品位降低到6.46%。(4)總尾礦的降鐵采用強(qiáng)磁-重選選別流程方案,可獲得品位、回收率分別為53.11%、23.37%的鐵精礦,尾礦品位降至9.21%�？傮w來說,大紅山正是通過以上試驗(yàn)研究與應(yīng)用,走上了鐵礦資源的高效綜合利用之路,生產(chǎn)規(guī)模及產(chǎn)品收入不斷擴(kuò)大,創(chuàng)造了大紅山80%以上的經(jīng)濟(jì)效益,奠定了大紅山礦未來發(fā)展的基礎(chǔ),對(duì)于國(guó)內(nèi)復(fù)雜難采、選鐵礦資源高效利用,降低能耗、減少尾礦排放量、保護(hù)環(huán)境提供了十分重要的示范作用。針對(duì)高硅酸鹽的與脈石物理化學(xué)性質(zhì)相當(dāng)、復(fù)雜結(jié)構(gòu)的貧、細(xì)、雜難選赤、褐鐵礦,首次創(chuàng)新應(yīng)用了強(qiáng)磁-振動(dòng)螺溜-搖床-離心機(jī)重選的磁-重聯(lián)合流程,適應(yīng)貧、細(xì)、雜高硅酸鹽難選礦的分選。通過試驗(yàn)研究,使尾礦品位從初期的15.34%降低到10.53%,每年可從尾礦中回收鐵精礦100萬t；同時(shí),鐵精礦硅含量從9%降至6.04%。論文通過試驗(yàn)研究,達(dá)到了提高精礦品位降低硅含量,同時(shí),降低尾礦中鐵含量的目標(biāo),實(shí)現(xiàn)礦產(chǎn)資源的綜合利用。
[Abstract]:With the rapid development of China's iron and steel industry, the domestic demand for iron ore is increasing, while the high price of imported iron ore seriously restricts the healthy development of iron and steel industry. Strengthening the development and utilization of iron ore in China plays an important role in the sustainable development of iron and steel industry. Yuxi Dahongshan Mining Co., Ltd. has abundant iron ore resources, 460 million tons of iron ore reserves and an average geological grade of 36. It is the main iron ore raw material base of Kunming Iron and Steel Group Co., Ltd. Dahongshan iron ore belongs to the typical paleo-marine volcanic rock type iron ore, the ore body is complex and diverse, the ore nature is complex, the iron minerals are mainly fine hematite and magnetite, the gangue minerals are mainly silicate and quartz minerals. The fine grain size of iron-bearing minerals makes the separation, quality improvement and comprehensive recovery of metal iron bring great difficulties. After nearly ten years of mining, the ore properties have changed greatly, the iron grade of the raw ore has decreased to about 35%. With the development of production, the content of magnetite, which is easy to be separated, decreases, and the content of silicic iron ore, which is difficult to separate, increases. The difficulty of ore separation and enrichment is obviously increased. Before 2008, the iron grade of total tailings in ore dressing of Dahongshan Iron Mine was as high as 14% and the amount of iron metal lost in the tailings was huge. At the same time, the silicon content in iron concentrate reached more than 9%. Resulting in a sharp increase in the cost of subsequent smelting. In order to solve the above problems and realize the comprehensive utilization of mineral resources, from two aspects of the improvement of mineral processing technology and the comprehensive utilization of tailings, the experimental study on improving the quality and reducing the silicon content of the secondary strong magnetic concentrate and the tail-dropping test of the two-stage strong magnetic tailings are carried out. Experimental study on the tailings of Duan Qiang magnetic tailings and the continued tailings of the total tailings. The experimental results show that: (1) the centrifuge has a good effect on the improvement and reduction of silicon in the secondary strong magnetic concentrate. When the ore concentration is between 18% and 26%, the ore with a grade of 51% or 55% is sorted by centrifuge. A concentrate with a yield of 57%, a recovery rate of 71% and a recovery of 78% and a grade of up to 64% can be obtained. (2) the second stage of strong magnetic tailings for iron reduction is a combined scheme of high intensity magnetic centrifuge and rocking bed, and the content of SiO2 is reduced to about 4%. (2) in the second stage of the strong magnetic tailings, the process of iron reduction is combined with a strong magnetic centrifuge and a shaking bed. The grade of the second stage of strong magnetic tailings can be reduced from 26% to 12.53%. (3) the grade of the iron concentrate with 42.32% yield of 37.72% can be obtained by adopting a combined scheme of one coarse, one fine, one sweep magnetic-heavy process for reducing iron from the magnetic tailings of one Duan Qiang, and the results are as follows: (1) the grade of the second stage of the strong magnetic tailings can be reduced from 28% to 12.53%. The grade of tailings is reduced to 6.46. (4) the grade of iron concentrate is 53.11% and the tailing grade is 9.21% respectively. In general, it is through the above experimental research and application that Dahongshan has embarked on the road of efficient and comprehensive utilization of iron ore resources, the scale of production and product income has been continuously expanded, and has created more than 80% of the economic benefits of Dahongshan. It lays the foundation for the future development of Dahongshan Mine and provides a very important demonstration for the domestic complex and difficult mining, the efficient utilization of iron ore separation resources, the reduction of energy consumption, the reduction of tailings emissions and the protection of the environment. In view of the physical and chemical properties of high silicate and gangue, the complex structure is poor, fine, impurity difficult to be separated, limonite, and limonite, the first innovative application of high-magnetic-vibration-rocket-centrifuge gravity separation of magnetic-gravity combined flow, adapt to poor, fine, The separation of refractory minerals from hetero-high silicate. The tailing grade is reduced from 15.34% at the beginning to 10.53%, and the iron concentrate can be recovered from the tailings for 1 million t per year, and the silicon content of the iron concentrate decreases from 9% to 6.04%. Through experimental study, the aim of improving concentrate grade and reducing silicon content and iron content in tailings is achieved, and the comprehensive utilization of mineral resources is realized.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TD951

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本文編號(hào)：2213668