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Modification of high titanium slag leaching of acid hydrolysis

Author: XuFuChang
Tutor: LiaoYaLong
School: Kunming University of Science and Technology
Course: Non-ferrous metallurgy
Keywords: Titanium dioxide Sulfuric acid method Chlorination Additive Response surface
CLC: TF823
Type: Master's thesis
Year: 2010
Downloads: 167
Quote: 0
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Abstract


Titanium dioxide is a white pigment is very versatile, widely used in various fields of national economy. With titanium dioxide preparation process of continuous improvement and continuous development of new products, production has excellent pigment properties and optical properties of titanium dioxide industrial products has become the development trend of the world. Industrial mass production of titanium dioxide, there are two main methods: Sulfuric acid and chlorination. Domestic production of titanium dioxide to sulfuric acid method still led from chlorination processes, products and technologies for advanced than sulfuric acid, but is limited by its raw materials and technology, product quality of domestic enterprises is not high prevalence of limitations. So far only a domestic enterprise produced by chlorination of titanium dioxide, it is difficult compete with the world's finest products. With the increasingly severe environmental requirements as well as the production of titanium dioxide chloride process of development, the production of titanium dioxide sulfuric acid will face significant challenges, mainly in how to address the use of ferrous sulfate and acid wastewater treatment. In this study, the production of sulfuric acid from titanium dioxide feedstock to proceed, on the sulfuric acid method is not suitable for production of high titanium slag (TiO290% or more) was modified to make it suitable for the production of sulfuric acid. After modification of high titanium slag, acid hydrolysis leaching rate has improved significantly. Also, there is no leaching of ferrous sulfate byproduct generated generated can be processed into gypsum calcium sulfate used in the construction industry, to tackle the use of ilmenite concentrate production of titanium dioxide by the sulphate process exists when the difficult problem of ferrous sulfate, while sulfuric acid method in order to solve the acid-soluble titanium slag smelting slag as raw materials during the difficult issue of separation of ilmenite. The process of modification to CaO, NaNO3 as additive, additive ratio was studied and calcination temperature on the phase composition of high titanium slag impact. Combined with response surface methodology (RSM), software design using Design Expert7.1 pilot program, select the leaching temperature, leaching time, liquid to solid ratio of three factors and five levels of 20 experimental points (including 6 center) for response surface analysis tests on the modified titania slag leaching parameters were optimized to obtain the optimum leaching conditions. After experimental conditions to determine the optimal modification of high titanium slag roasting process: high titanium slag and CaO, NaNO3 the ratio of 10:8:3; calcination temperature 1200-1300 ℃; calcination time 120min. Modified roasting in the high titanium slag reaction Ti02 and CaO calcium titanate, and the higher the temperature, the greater the ratio of additive reaction more completely. RSM optimized modified titania slag leaching optimum process parameters: extraction temperature 60 ℃; leaching time 90min; liquid to solid ratio of 4.5:1, this time, the leaching rate of predictive value of 94.42%, the experimental value of 94.20% , the two are very close. Under the optimal conditions for the modified sample A-1-A-12 for leaching experiments in which the sample A-6 The leaching rate can reach 96.23%. The model description of the software is significant, wherein said leaching temperature x1, x2 that leaching time, x3 liquid to solid ratio, y is the leaching rate. In addition, the modified high titanium slag leaching kinetics experiments can prove their kinetic equations corresponds a one (1-Rr) 1/3 = kf, belonging to the shrinking core model. And through the Arrhenius empirical formula, as well as a range of different temperatures lnk-1 / T diagram, the activation energy obtained is 46.76 kJ · mol-1, leaching kinetics equation: Thus, it can be determined that the leaching process is a chemical reaction control. Modified slag leaching acid hydrolysis results indicate a high titanium slag thesis modification process is feasible, can enrich the production of titanium dioxide feedstock sulfuric acid, sulfuric acid method further address environmental quality, consistent with national sustainable development strategies.

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CLC: > Industrial Technology > Metallurgical Industry > Nonferrous metal smelting > Light metal smelting > Titanium
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