微波焙烧—酸碱联合浸出高钛渣的工艺研究

发布时间：2018-03-25 08:41

  本文选题：高钛渣　切入点：人造金红石　出处：《昆明理工大学》2017年硕士论文

【摘要】：二氧化钦俗称钛白,在物理化学性质方面都比较稳定。同时,具有折射率高、遮盖力大、着色力强、抗粉化性等优良的光学与电学性能。所以被广泛应用在造纸、塑料、油漆、油墨、搪瓷、电工、冶金、化工等领域。现今,工业生产钛白的方法有两类:一是硫酸法生产钛白;二是氯化法生产钛白。金红石是一种生产钛白的重要原料,随着钛工业的不断发展,对天然金红石的过度地开采,造成现可供应的天然金红石已经逐渐枯竭。而人造金红石在性能等方面与天然金红石相似,可作为天然金红石的优质替代品。因此不断探索生产人造金红石的新的工艺,成为钛工业发展不可忽略的趋势。本文以云南某地区的高钛渣作为原料,结合微波加热技术,提出了一种“高钛渣-碱浸-微波焙烧-酸浸-煅烧”的微波处理高钛渣的工艺路线。微波加热技术应用于冶金材料领域,是近年来发展起来的一项新的冶金技术。作为一种清洁能源用于加热技术,具有选择性加热、加热均匀、热转化效率高、整体加热等优势。本文采用化学成分分析、粒度分析、TG-DSC分析、XRD分析、SEM-EDS分析、Raman分析、FT-IR分析、XPS分析等现代测试表征手段,对原料及经“高钛渣-碱浸-微波焙烧-酸浸-煅烧”处理后得到的产品,进行化学成分、粒度组成、升温特性、物相结构、表观形貌及组成官能团等考察分析。并通过研究各过程的相关原理及探索最佳的工艺参数,得到的最佳的实验条件参数是:碱浸实验条件:温度94℃,碱液浓度80 g/L,液固比6:1,时间60 min;微波焙烧条件:温度为850℃,时间为120 min,Na2CO3/钛渣质量比为0.25;酸浸实验条件:酸浸温度94℃,硫酸浓度30%,时间为4h;煅烧实验条件:温度950℃,时间30min,通过实验能够获得TiO2含量在89%以上的高品质的人造金红石产品。本文对高钛渣进行了合理的利用,提出了“高钛渣-碱浸-微波焙烧-酸浸-煅烧”工艺路线,该工艺路线实验效果良好,为深度开发与合理利用钛资源提供了一条新的途径。
[Abstract]:Titanium dioxide, commonly known as titanium dioxide, is relatively stable in physical and chemical properties. At the same time, it has excellent optical and electrical properties such as high refractive index, large shading power, strong coloring power, anti-powdering ability, etc., so it is widely used in paper making, plastics, paint, etc. Printing ink, enamel, electrician, metallurgy, chemical industry, etc. Nowadays, there are two kinds of methods for producing titanium dioxide in industry: one is to produce titanium dioxide by sulfuric acid; the other is to produce titanium white by chlorination. Rutile is an important raw material for producing titanium dioxide. With the continuous development of the titanium industry, the excessive exploitation of natural rutile has resulted in the gradual depletion of the available natural rutile, and the artificial rutile is similar to natural rutile in performance and other aspects. It can be used as a good substitute for natural rutile. Therefore, it has become a trend that the titanium industry can not be ignored by exploring the new technology of producing artificial rutile. In this paper, the high titanium slag from a certain area of Yunnan is used as raw material, combined with microwave heating technology. A method of microwave treatment of high titanium slag with "high titanium slag, alkali leaching, microwave roasting, acid leaching and calcination" was put forward. Microwave heating technology was applied to metallurgical material field. It is a new metallurgical technology developed in recent years. As a kind of clean energy used in heating technology, it has the advantages of selective heating, uniform heating, high thermal conversion efficiency and integral heating. The chemical composition and particle size composition of the raw materials and the products obtained after the treatment of "high titanium slag, alkali leaching, microwave roasting, acid leaching and calcination" were analyzed by means of modern means such as FT-IR analysis and XPS. The characteristics of temperature rise, phase structure, apparent morphology and composition of functional groups were investigated and analyzed. By studying the relevant principles of each process and exploring the best technological parameters, the optimum experimental parameters were obtained as follows: alkali leaching experiment conditions: temperature 94 鈩，

本文编号：1662371