本文選題：磁黃鐵礦　切入點(diǎn)：脫硫　出處：《西安科技大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：冀東是我國(guó)北方生產(chǎn)鐵精粉的主要產(chǎn)區(qū),鐵礦石含硫量較高并以磁黃鐵礦的形式存在,造成了整個(gè)地區(qū)鐵精礦中含硫量較高。由于磁黃鐵礦性質(zhì)的復(fù)雜性,采用常規(guī)磁選很難將磁黃鐵礦和磁鐵礦分離,其兩者之間的有效分離已成為國(guó)內(nèi)外選礦領(lǐng)域技術(shù)研究和生產(chǎn)實(shí)踐中的主要難題之一。本文基于浮選降硫脫除鐵精礦中的磁黃鐵礦處理工藝,針對(duì)冀東地區(qū)含硫鐵精礦中磁黃鐵礦的浮選捕收、活化機(jī)理進(jìn)行較為深入、細(xì)致的探討,為冀東含硫鐵精礦脫硫工藝提供了理論依據(jù)和技術(shù)支持。對(duì)于鐵精礦的物理化學(xué)性質(zhì)主要進(jìn)行原礦多元素分析、粒級(jí)分布、原礦磨礦細(xì)度及多元素測(cè)定、鐵物相試驗(yàn)和光譜試驗(yàn),純礦物浮選行為研究。在此基礎(chǔ)上進(jìn)行含硫鐵精礦浮選試驗(yàn)研究,通過(guò)藥劑種類及用量試驗(yàn)研究,確定酸堿環(huán)境、活化劑、捕收劑等條件,對(duì)流程進(jìn)行粗精選優(yōu)化研究,確保試驗(yàn)結(jié)果的準(zhǔn)確性、合理性,從而確定合理的浮選工藝。通過(guò)浮選脫硫法進(jìn)行一粗一精及一粗多精脫硫試驗(yàn),確定在一粗四精的浮選條件下采用硫酸總用量560g/t、硫酸銅150g/t、丁黃藥:丁銨黑藥(1:1) 700 g/t和2#油150g/t條件下,針對(duì)TFe品位60.60%、含硫4.04%的原礦,采用一粗四精四掃脫硫浮選流程,最終可獲得鐵精礦TFe62.31%、S0.64%,TFe回收率79.27%的優(yōu)異指標(biāo),對(duì)現(xiàn)場(chǎng)生產(chǎn)具有實(shí)際的指導(dǎo)意義。通過(guò)對(duì)磁黃鐵礦內(nèi)部及表面特性機(jī)理研究可知磁黃鐵礦在(1,1,0)面的表面能最小、穩(wěn)定性更高,通過(guò)分子動(dòng)力學(xué)計(jì)算結(jié)果可知,氧氣與磁黃鐵礦相互作用能為-42.91kJ/mol,遠(yuǎn)大于水分子相互作用能,說(shuō)明在有氧浮選過(guò)程當(dāng)中更有利于磁黃鐵礦的氧化過(guò)程。通過(guò)表面Zeta電位研究可知,加入丁黃藥、戊黃藥后磁黃鐵礦表面Zeta電位均有向左漂移的趨勢(shì),說(shuō)明捕收劑與磁黃鐵礦發(fā)生了吸附。通過(guò)藥劑與礦物表面作用后的紅外光譜分析可知,磁黃鐵礦與丁黃藥在中性條件相互作用后,C—O—C伸縮振動(dòng)吸收峰增加到1202.52cm-1,C =S伸縮振動(dòng)吸收峰降低至1022.98cm-1,說(shuō)明礦物表面產(chǎn)生化學(xué)吸附并有丁雙黃藥生成。通過(guò)對(duì)浮選工藝研究及磁黃鐵礦內(nèi)部及表面特性機(jī)理研究,揭示了磁黃鐵礦表面的吸附特性,闡明了藥劑穩(wěn)定性、增加天然可浮性的的作用機(jī)理,在此基礎(chǔ)上找出了適合高硫磁黃鐵礦的適宜藥劑,為我國(guó)冀東地區(qū)含硫鐵精礦的開發(fā)應(yīng)用找到了一條可行的新途徑。
[Abstract]:Jidong is the main producing area of iron concentrate powder in the north of China. Iron ore has high sulphur content and exists in the form of pyrrhotite, which results in higher sulphur content in iron concentrate in the whole area, due to the complexity of pyrrhotite properties. It is difficult to separate pyrrhotite from magnetite by conventional magnetic separation. The effective separation between the two has become one of the main problems in the technical research and production practice in the field of mineral processing at home and abroad. This paper is based on the process of removing pyrrhotite from iron concentrate by flotation. Aiming at the flotation and collecting mechanism of pyrrhotite in pyrite concentrate in eastern Hebei province, the mechanism of activation is discussed in detail. It provides theoretical basis and technical support for desulphurization process of iron concentrate containing sulfur in eastern Hebei Province. The physical and chemical properties of iron concentrate are mainly determined by multielement analysis, particle size distribution, grinding fineness and multielement determination. On the basis of the study on the flotation behavior of pure minerals, the flotation test of iron concentrate containing sulphur was carried out. The conditions of acid-base environment, activator, collector and so on were determined through the experimental study of the type and dosage of reagent, etc. In order to ensure the accuracy and reasonableness of the test results, a reasonable flotation process is determined by optimizing the process of coarse cleaning. The desulfurization experiments of one coarse and one fine and one coarse and multiple fine are carried out by the flotation desulfurization method. It is determined that under the conditions of a coarse and four fine flotation conditions, the total dosage of sulfuric acid is 560 g / t, copper sulfate 150 g / t, butadiene: butylammonium black 1) 700g / t and 2# oil 150g / t. For the raw ore with a TFe grade of 60.60g / t and a sulfur content of 4.04%, the flotation process of one coarse tetrafine and four sweep desulfurization is adopted. Finally, the excellent index of 79.27% TFE recovery rate of iron concentrate TFE 62.31 and TFE 0.64 can be obtained, which has practical guiding significance for field production. Through the study of the mechanism of internal and surface characteristics of pyrrhotite, it can be seen that pyrrhotite has the smallest surface energy and higher stability on the surface. The results of molecular dynamics calculation show that the interaction energy of oxygen and pyrrhotite is -42.91kJ / mol, which is much larger than that of water molecule interaction, which indicates that the oxidation process of pyrrhotite is more favorable in the process of aerobic flotation. The surface Zeta potential study shows that the oxidation process of pyrrhotite is more favorable to the oxidation of pyrrhotite. After adding butyl xanthate, the surface Zeta potential of pyrrhotite tends to drift to the left, which indicates that the collector adsorbs with pyrrhotite. After the interaction between pyrrhotite and butyl xanthate under neutral conditions, the vibrational absorption peak of C-O-C was increased to 1202.52 cm ~ (-1) C ~ (-1) C ~ (-1) C ~ (-1) S stretching vibration absorption peak decreased to 1022.98 cm ~ (-1), indicating that chemical adsorption was produced on the mineral surface and the formation of butadiene xanthate was obtained. Study on the mechanism of internal and surface characteristics of pyrrhotite, The adsorption characteristics of pyrrhotite surface are revealed, the action mechanism of the stability of the reagent and the increase of the natural floatability are expounded. On the basis of this, the suitable reagent suitable for high sulfur pyrrhotite is found out. A new feasible way is found for the development and application of iron sulfide concentrate in eastern Hebei.
【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TD951;TD923

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本文編號(hào)：1590293