本文選題：鈦鐵礦　切入點(diǎn)：還原銹蝕法　出處：《中南大學(xué)》2011年碩士論文

【摘要】：隨著金紅石資源逐漸枯竭,價(jià)格低廉的鈦鐵礦已成為鈦工業(yè)的主要生產(chǎn)原料,但鈦鐵礦的Ti02品位較低,一般需將其制備成高品位的富鈦料。還原銹蝕法被認(rèn)為是鈦鐵礦制取富鈦料的一種有效方法,目前在工業(yè)中得到應(yīng)用,但該法存在還原難度大,銹蝕時(shí)間長(zhǎng)、生產(chǎn)效率低等問(wèn)題。針對(duì)上述問(wèn)題開(kāi)展鈦鐵礦還原銹蝕法制取富鈦料過(guò)程強(qiáng)化的基礎(chǔ)研究,對(duì)于加快還原銹蝕法在鈦鐵礦制取富鈦料工業(yè)生產(chǎn)中的推廣應(yīng)用具有重大意義。 本文以攀西鈦鐵礦為原料,綜合運(yùn)用冶金動(dòng)力學(xué)及電化學(xué)原理,結(jié)合X-射線衍射、光學(xué)顯微鏡和掃描電鏡等現(xiàn)代微觀測(cè)試手段,探討了添加劑對(duì)鈦鐵礦還原銹蝕法制取富鈦料的影響,深入研究了不同銹蝕體系對(duì)還原鈦鐵礦銹蝕行為及其對(duì)富鈦料制備的影響；在此基礎(chǔ)上系統(tǒng)研究了還原鈦鐵礦銹蝕速率過(guò)程的強(qiáng)化措施及鐵副產(chǎn)品的物相控制與鈦鐵分離的關(guān)系,獲得了以下主要結(jié)論： (1)鈦鐵礦配加添加劑對(duì)還原鈦鐵礦金屬化率產(chǎn)生明顯的影響,但對(duì)后續(xù)的銹蝕分離過(guò)程中非鐵雜質(zhì)的去除作用不大。對(duì)還原鈦鐵礦金屬化率的影響是添加劑影響鈦鐵礦還原銹蝕法制取富鈦料的主要原因。研究表明,適宜的添加劑為Na2CO3+Na2B4O7·10H2O,其適宜用量為Na2CO3 1.5%、Na2B4O7·10HzO 1.5%。 (2)還原鈦鐵礦的銹蝕體系選擇研究發(fā)現(xiàn),氟化氫銨+鹽酸和氯化銨+鹽酸有使還原鈦鐵礦銹蝕反應(yīng)轉(zhuǎn)變?yōu)榻龇磻?yīng)的傾向,適宜的銹蝕體系為氯化銨溶液。液固比、通氣速率和溫度是其主控因素。 (3)氯化銨銹蝕體系通入氧氣是強(qiáng)化還原鈦鐵礦銹蝕反應(yīng)速率過(guò)程的有效措施。動(dòng)力學(xué)研究表明,還原鈦鐵礦中金屬鐵的銹蝕過(guò)程受內(nèi)擴(kuò)散控制,銹蝕體系通入氧氣金屬鐵銹蝕過(guò)程的表觀反應(yīng)活化能由通入空氣時(shí)的13.28 KJ·mol~(-1)降低至8.12 KJ·mol~(-1),通入氧氣加快了其內(nèi)擴(kuò)散過(guò)程,促進(jìn)了還原鈦鐵礦中金屬鐵銹蝕過(guò)程的陰極反應(yīng)。 (4)還原鈦鐵礦銹蝕產(chǎn)物中鐵副產(chǎn)品的物相影響后續(xù)鈦鐵分離效果,研究發(fā)現(xiàn),形成針鐵礦時(shí)鈦鐵分離效果最好,所得富鈦料Ti02品位為77.81%,回收率為90%左右,產(chǎn)品粒度分布均勻,主要物相為酸溶性良好的黑鈦石,是硫酸法生產(chǎn)鈦白的優(yōu)質(zhì)原料。 本論文的研究結(jié)果為提高鈦鐵礦還原銹蝕法制取富鈦料生產(chǎn)效率提供了理論指導(dǎo)和技術(shù)支撐,對(duì)鈦鐵礦制取富鈦料行業(yè)的技術(shù)進(jìn)步具有積極的推動(dòng)作用。
[Abstract]:With the gradual depletion of ilmenite rutile resources, low price has become the main raw materials for the production of titanium industry, but ilmenite Ti02 low grade, generally needs to be prepared into high grade titanium rich material. Reductive method is considered as an effective method of making titanium titanium rich material, the application of in the industry, but the existence of difficult reduction, long time corrosion, low production efficiency. In order to solve the above problems from ilmenite to carry out basic research of titanium rich material to enhance the process of reduction corrosion method, to speed up the reduction corrosion method in making titanium rich titanium material application in industrial production is of great significance.
In this paper, using Panxi ilmenite as raw materials, comprehensive utilization of metallurgical kinetics and electrochemical principle, combined with X- ray diffraction, optical microscopy and scanning electron microscopy and other modern microscopic test method, the effects of additives on ilmenite reduction corrosion method from titanium rich material, in-depth study of the different corrosion system of reduced ilmenite corrosion behavior and its influence on the titanium rich material preparation; and the relationship between Ti Fe separation control system based on the reduction of ilmenite corrosion rate process of strengthening measures and iron products, the main conclusions are as follows:
(1) ilmenite adding additives on reduction of ilmenite metallization rate have a significant impact, but has little effect on the removal of non rust iron impurity separation process in the follow-up. The effect of reduction of ilmenite metallization rate is mainly due to additive effect on ilmenite reduction corrosion method from titanium rich material. Research shows that suitable additives for Na2CO3+Na2B4O7 - 10H2O, the suitable dosage of Na2CO3 1.5%, Na2B4O7 10HzO 1.5%.
(2) the selection of corrosion system for reduced ilmenite has found that ammonium fluoride, hydrochloric acid and ammonium chloride + hydrochloric acid have the tendency to turn the corrosion reaction of reduced ilmenite into leaching reaction. The suitable corrosion system is ammonium chloride solution. The ratio of liquid to solid, ventilation rate and temperature are the main controlling factors.
(3) ammonium chloride corrosion system of oxygen is the effective way to strengthen the rust reaction rate of reduced ilmenite. Kinetic studies show that the reduction of corrosion process of metallic iron in ilmenite is controlled by internal diffusion, corrosion system into the process of oxygen corrosion of the metal rust apparent reaction activation energy by air at 13.28 KJ mol~ (-1) reduced to 8.12 KJ - mol~ (-1), oxygen diffusion rate in the process, promote the cathodic reaction of rust of metallic reduced ilmenite.
(4) the corrosion products of iron ilmenite by-product reduction phase influence subsequent Ti Fe separation effect, the study found that Ti Fe separation effect is the best form of goethite, the titanium rich material Ti02 grade is 77.81%, the recovery rate is about 90%, the product particle size distribution, the main phase is the acid soluble titanium black stone good, is a good raw material for sulfuric acid production of titanium dioxide.
The research results in this paper provide theoretical guidance and technical support for improving the production efficiency of ilmenite by reducing rust and preparing titanium rich materials, and play a positive role in promoting technological progress in ilmenite production.

【學(xué)位授予單位】：中南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2011
【分類號(hào)】：TF823

【引證文獻(xiàn)】

相關(guān)碩士學(xué)位論文 前2條

1 翁文杰;鈦鐵礦預(yù)還原—電爐法制備高鈦渣技術(shù)的優(yōu)化研究[D];中南大學(xué);2012年

2 陳麗榮;鈦鐵礦選擇性碳（氮）化法制備富鈦料研究[D];中南大學(xué);2012年

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本文編號(hào)：1700976