硫酸法和氯化法钛白能耗分析与评述

Energy consumption analysis and comments of manufacturing titanium dioxide by sulfuric acid process and chloride process

钛白生产方法有硫酸法和氯化法两种,究竟哪一种方法好一直存在争议。从化学热力学角度,推算硫酸法和氯化法生产钛白的理论能耗,结果表明氯化法比硫酸法理论能耗低,氯化法具有节能优势。以钛铁矿原料为基态,比较硫酸法和氯化法的综合能耗,结果表明氯化法仍具有节能优势。以钛铁矿原料为基态,比较硫酸法产品(主产品为钛白,副产品为绿矾)和氯化法产品(主产品为钛白,副产品为粗铁)万元产值的能耗,结果表明氯化法仍具有明显的优势。究竟选择哪一种生产方法,能耗指标仅仅是一个方面,还要从投资、技术来源、运行成本、产品质量等方面综合考虑。

Manufacturing methods of titanium dioxide are sulfuric acid process and chloride process. Which one is bet- ter,it has been a subject of debate. By using the method of chemical thermodynamics,theoretical energy consumption of the two methods was calculated. Results showed that theoretical energy consumption of chloride process was lower than that of sulfuric acid process, so chloride process had advantages of energy-saving. Comparing the comprehensive energy consumption of the two with ihnenite as ground state,results indicating chloride process still had the advantages of energy-saving. Using il- menite as ground state,the products of sulfuric acid process were titanium dioxide and by-product FeSO4 ~ 7HzO,and the products of chloride process were titanium dioxide and by-product crude iron. Comparing the output value of energy con- sumption per ten-thousand-yuan, chloride process was still better than sulfuric acid process in the advantages of energy-sav- ing. But selecting which manufacturing method, the energy consumption is just one aspect, and it must consider the other aspects such as investment, source of technology, operation cost, and product quality.