| With the continuous economic development and social progress, human beings have growing demand for various metal, at the same time, as the Metallurgical industry's development, the rich ore of various Metal Resources have been reduced or even become depleted. Nowadays the conflicts of supply and demand for mineral resources are increasingly prominent. In Western China, the content of Ti-bearing Slag in waste metal residue after high-temperature ironed is about 18% (TiO2), which hasn't been utilized for a long time, thus causing a serious waste on resources, land as well as polluting the environment. Therefore, the study on comprehensive utilization of industrial waste residue plays a quite important role on the sustainable development of the national economy and Western Development.Research object of the paper is a titanium blast furnace residue in certain place in Sichuan, we analyze its main composition and constitute of mineral throughⅩfluorescence spectrometry. We study the separation of titanium accumulation by particle size, water re-election, magnetic and other physical methods. The results are showed that:the residue is the alkaline tailings, it is mainly in the perovskite titanium form. Water re-election after sorting, grade of heavy mineral is 20.76%, light mineral is 15.69%.Afer magnetic separation, grade of the magnetic materials is 18.98%, grade of non-magnetic materials is 17.97%, grade of original materials is 18.56%.Compared with the grade of original materials, results of TiO2-rich is not obvious. Through physical laws, it makes separation and enrichment of titanium tailings little effect.With the four factors and three level orthogonal test, it is investigated by hydrochloric acid and sulfuric acid.As leaching agent contains blast furnace slag leaching time, pH, liquid to solid ratio, mixing time, leaching temperature on leaching rate of TiO2.The results show that:leaching with hydrochloric acid and sulfuric acid as the leaching agent, it contains blast furnace slag, the rates of TiO2 highest leaching is 65.09% and 65.24%. Range analysis of test data, the order of the factors are, hydrochloric acid system:pH value of> temperature> liquid ratio> mixing time; sulfuric acid system:pH value of> mixing time> liquid to solid ratio of> temperature. By comparison of sulfuric acid system in the energy, time and amount of acid consumption, it is better than hydrochloric acid.Preparation of titanium dioxide with sulfuric acid by single factor method of acid leaching stage liquid-solid ratio, sulfuric acid, leaching temperature on leaching rate of TiO2 and optimize the process conditions. In the pH <0.5, the ratio of liquid and solid is 4.5:1, the sample of the dosage of sulfuric acid is 95ml/100g. The leaching temperature is 45℃, leaching rate of TiO2 is 69.71%. After washing, the total leaching rate of TiO2 is up to 89.82%. Made 3 times of repeatability, the average leaching rate of TiO2 is 89.95%.The hydrolysis temperature and hydrolysis time on the hydrolysis rate of TiO2 is investigated. The rate of hydrolysis is up to 96%. Hydrolysis temperature is 95℃, hydrolysis time is 2h. The goal product is washed, dried, the purity of calcination TiO2 is up to 98.82%, soluble in water <0.6%, not over 45μm standard sieve fossil <01%, anatase titanium dioxide have achieve the main basic indicators.Preliminary study of the blast furnace slag is mainly inorganic materials prepared exterior paint performance. The addition of water glass is 30%, the addition of alkali (NaOH 2%, KOH 2%) is 4%, the addition of alkaline earth metal oxide is 5%, the addition of filler is 2%, a system of exterior paint coating is not softened, no loss, no brush marks, no cracks,it is good resistance to freezing and thawing. Through comprehensive utilization of titanium slag for the preparation of inorganic coatings for exterior wall, it provides experimental datas. |
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