A two-stage oxidation—alkali leaching—acid leaching method was proposed to recovery Fe,V,and Ti in modified Ti-bearing blast furnace slag.The optimal experiment conditions of iron extraction were one-stage oxidation...A two-stage oxidation—alkali leaching—acid leaching method was proposed to recovery Fe,V,and Ti in modified Ti-bearing blast furnace slag.The optimal experiment conditions of iron extraction were one-stage oxidation time 40 s and holding time 8 min.The recovery rate of iron was 89.93%.The optimum experiment conditions of vanadium extraction were total oxidation time of 126 s,NaOH concentration of 4.0 mol/L,leaching temperature of 95℃,leaching time of 90 min,and the number of cycle was 4.The leaching rate of vanadium was 92.13%.The optimal experiment conditions of titanium extraction were HCl concentration of 4.5 mol/L,leaching temperature of 75℃,and leaching time of 90 min.The TiO_(2)content of synthetic rutile was 98.61%.展开更多
Accurate and elegant diction is undoubtedly an important criterion for the evaluation of a good article. In College English Band 4/6 Writing, it is vital that the candidates attach great importance to the meticulous c...Accurate and elegant diction is undoubtedly an important criterion for the evaluation of a good article. In College English Band 4/6 Writing, it is vital that the candidates attach great importance to the meticulous choice of words, using the advanced and precise vocabulary to replace the primary and general ones. This paper highlights the significance of diamond words in the upgrading of literal and artistic flavor of an article, which directly affects the final grading of the writing. While summarizing and analyzing the problems of candidates in word manipulation and selection in writing, the author offers solution and strategy on how to upgrade the insipid and dull words by means of synonymous substitution and transformation with an aim to enhance the impressiveness and readability of the essay, and ultimately improve band 4/6 writing performance展开更多
基金financial support from the National Science and Technology Support Program of China(No.2015BAB18B00)。
文摘A two-stage oxidation—alkali leaching—acid leaching method was proposed to recovery Fe,V,and Ti in modified Ti-bearing blast furnace slag.The optimal experiment conditions of iron extraction were one-stage oxidation time 40 s and holding time 8 min.The recovery rate of iron was 89.93%.The optimum experiment conditions of vanadium extraction were total oxidation time of 126 s,NaOH concentration of 4.0 mol/L,leaching temperature of 95℃,leaching time of 90 min,and the number of cycle was 4.The leaching rate of vanadium was 92.13%.The optimal experiment conditions of titanium extraction were HCl concentration of 4.5 mol/L,leaching temperature of 75℃,and leaching time of 90 min.The TiO_(2)content of synthetic rutile was 98.61%.
文摘Accurate and elegant diction is undoubtedly an important criterion for the evaluation of a good article. In College English Band 4/6 Writing, it is vital that the candidates attach great importance to the meticulous choice of words, using the advanced and precise vocabulary to replace the primary and general ones. This paper highlights the significance of diamond words in the upgrading of literal and artistic flavor of an article, which directly affects the final grading of the writing. While summarizing and analyzing the problems of candidates in word manipulation and selection in writing, the author offers solution and strategy on how to upgrade the insipid and dull words by means of synonymous substitution and transformation with an aim to enhance the impressiveness and readability of the essay, and ultimately improve band 4/6 writing performance
