CAJ | 학술논문

研究以碳素铬铁为原料在碳酸钠与空气的存在下经氧化焙烧制备铬酸钠的反应过程。考察反应温度、反应时间、碳酸钠与碳素铬铁的摩尔比对氧化焙烧过程的影响，并讨论反应的热力学与动力学。结果表明，当反应温度达到一定值时反应速度会产生明显的跃升，粒度较小的碳素铬铁可以在较低的温度下产生反应速率的跃升。铬的回收率随碳酸钠与碳素铬铁摩尔比的增加而增大，当碳酸钠与碳素铬铁的摩尔比为1.2：1时，铬的回收率达到99.34%。此工艺产生的铬渣量极少，仅为所得产品质量的1/3左右，且铬渣中Fe含量高达60.41%，可用于碳还原法生产海绵铁，实现铬渣的彻底解毒和零排放。
연구이탄소락철위원료재탄산납여공기적존재하경양화배소제비락산납적반응과정。고찰반응온도、반응시간、탄산납여탄소락철적마이비대양화배소과정적영향，병토론반응적열역학여동역학。결과표명，당반응온도체도일정치시반응속도회산생명현적약승，립도교소적탄소락철가이재교저적온도하산생반응속솔적약승。락적회수솔수탄산납여탄소락철마이비적증가이증대，당탄산납여탄소락철적마이비위1.2：1시，락적회수솔체도99.34%。차공예산생적락사량겁소，부위소득산품질량적1/3좌우，차락사중Fe함량고체60.41%，가용우탄환원법생산해면철，실현락사적철저해독화령배방。
An oxidizing roasting process of carbon ferrochrome to prepare sodium chromate in the presence of sodium carbonate and air was investigated. The effects of reaction temperature, reaction time, mole ratio of sodium carbonate to carbon ferrochrome were studied, and thermodynamics and kinetics of the reaction were also discussed. It was observed that there was a sudden increase in reaction rate when the temperature rose to a certain value, and the sample with a smaller grain size could start the sudden increase at a lower temperature. The chromium recovery rate increased with the increase of mole ratio of sodium carbonate to carbon ferrochrome, and it reached up to 99.34% when mole ratio of sodium carbonate to carbon ferrochrome increased to 1.2:1. The chromium residue yielded from this method was only about 1/3 of the product. Moreover, the content of Fe in the residue was as high as 60.41%. Therefore, it can be easily recovered to produce sponge iron, realizing complete detoxication and zero-emission of chromium residue.