【正文】 內(nèi)蒙古科技大學(xué)畢業(yè)論文 外購鐵精礦再磨再選工藝現(xiàn)狀調(diào)查及分析 摘 要 隨著鋼產(chǎn)量的增加 ,包鋼除采用自產(chǎn)鐵精礦外 ,一直配加部分外購鐵精礦。外購鐵精礦來源較雜 ,成分、粒度都很不穩(wěn)定 ,特別是硅含量偏高 ,粒度偏粗 ,鐵品位在 60 %～ 66 %之間 ,硅在 4 %～ 10 %之間 ,用于高爐生產(chǎn)易造成波動。針對這一問題 ,選礦廠經(jīng)過大量的試驗研究 ,提出了利用閑置的選礦系列對外購鐵精礦再磨再選提鐵降硅的選礦工藝 ,為高爐的生產(chǎn)提供了精料，提高高爐利用系數(shù)，提高鐵精粉品位，對外購鐵精礦采用“磨礦 弱磁選電磁螺旋柱 細(xì)篩 細(xì)磨 弱磁選”工藝流程，可實現(xiàn)再磨 鐵精礦品位達(dá)到 69%。 關(guān)鍵詞： 再磨再選；細(xì)篩；鐵精礦；電磁螺旋柱；弱磁選內(nèi)蒙古科技大學(xué)畢業(yè)論文 Outsourcing iron concentrate again choose status grinding Investigation and chromatography Abstract With the growth of the steel product , in addition to the locally produced iron ore concentrate , Baogang also uses the out purchased iron ore concentrate as an addition. The out purchased iron ore concentrates are from many different places ,so both the position and the particle size is not stable , especially the silicon content of those is higher and the particle size larger , and with the iron grade in 60 % 66 % and silica in 4 % 10 % , likely causing fluctuation in the blast furnace production. To this problem , a lot of research work has been done in our plant and as a result , the laid off dressing means are used again to decrease the silica content and improve the iron concentrate grade of the out purchased iron concentrate , proving the qualified concentrate to the blast furnace of blast furnace, improve the grade of iron essence pink, purchase by foreign iron concentrate grinding low intensity magic separation column electromagic spiral fine sieve fine grind low intensity magic separation process, which can realize more iron concentrate grade grinding achieved 69 percent. Key words: Then again choose grinding。 Fine sieve。 Iron ore。 Electromagic spiral column。 Weak magic 內(nèi)蒙古科技大學(xué)畢業(yè)設(shè)計說明書（畢業(yè)論文） 目 錄 摘 要 ......................................................................................................................................... I Abstract....................................................................................................................................... II 第一章 緒論 .............................................................................................................................. 1 研究背景 ..................................................................................................................... 1 研究意義 ..................................................................................................................... 1 第二章 考察內(nèi)容 ...................................................................................................................... 2 再磨原料性質(zhì) ............................................................................................................. 2 再磨原料性質(zhì)分析 .......................................................................................... 2 考察原料性質(zhì)分析 .......................................................................................... 5 第一階段考察指標(biāo) ..................................................................................................... 8 電磁螺旋柱 ...................................................................................................... 8 濃縮作業(yè) ...................................................................................................... 14 磨礦作業(yè) ........................................................................................................ 15 φ350 旋流器組作業(yè) ........................................................................................ 17 弱磁選別作業(yè) ................................................................................................ 19 最終鐵精礦指標(biāo)與攻關(guān)目標(biāo)對比 ................................................................ 22 .第二階段試驗指標(biāo) ................................................................................................... 25 電磁螺旋柱作業(yè) ............................................................................................ 26 細(xì)篩作業(yè) ........................................................................................................ 26 濃縮作業(yè) ........................................................................................................ 27 內(nèi)蒙古科技大學(xué)畢業(yè)設(shè)計說明書（畢業(yè)論文） 磨礦作業(yè) ........................................................................................................ 28 φ350 旋流器組分級作業(yè) ................................................................................ 28 弱磁選別作業(yè) ................................................................................................ 28 第二階段攻關(guān)考察最終鐵精礦指標(biāo) ............................................................ 29 第二階段主要產(chǎn)品性質(zhì)分析 ........................................................................ 30 下一步改進(jìn) ............................................................................................................... 34 第三章 結(jié)論 ............................................................................................................................ 35 再磨原料與工業(yè)分流試驗原料的差異 ................................................................... 35 兩段磨礦原料與工業(yè)分流試驗原料的差異 ........................................................... 35 現(xiàn)存問題 ................................................................................................................... 35 參考文獻(xiàn) .................................................................................................................................. 36 附錄 .......................................................................................................................................... 37 致謝 .......................................................................................................................................... 44 內(nèi)蒙古科技大學(xué)畢業(yè)論文 第一章 緒論 研究背景 礦業(yè)開發(fā)是人類生存和社會發(fā)展最重要的活動之一，礦產(chǎn)資源一般是使用后不可再生的。因此，世界上可以利用的礦產(chǎn)資源將隨著開發(fā)程度的 加大和時間的推移而加快消失速度。近幾年來 ,包鋼為優(yōu)化煉鐵入爐原料結(jié)構(gòu) ,提高高爐技術(shù)經(jīng)濟(jì)指標(biāo) ,燒結(jié)原料中外購鐵精礦的比例已達(dá) 50%。外購鐵精礦來源廣 ,成份及性能波動較大 ,SiO2 含量高。由于包鋼沒有大型原料中和場地 ,進(jìn)入燒結(jié)前的鐵料很不均勻 ,質(zhì)量波動大 ,造成燒結(jié)礦的質(zhì)量很不穩(wěn)定 ,高爐冶煉難度大。為解決這一難題 ,包鋼選礦廠成功地開發(fā)出外購鐵精礦采