http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Du Guangchao (검색결과 1 건)
- 무료
- 기관 내 무료
- 유료
-
Jiang Lin,He Wenyi,Du Guangchao,Zheng Hao,Peng Yi 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.10
Vanadium precipitation with acidic ammonium salt is widely applied in industrial practice of vanadium pentoxide production. However, the ammonia wastewater produced in the precipitation process and resultant environmental issues have been paid increasing attention. With the intention of reducing wastewater and extra cost, an enhancement in the vanadium content of basic qualified solution is the most directly effective method. Unfortunately, high vanadium concentration brings about a low precipitation rate and a high Na content in ammonium polyvanadate, as a result of hydrolysis existence in the precipitation process. The effect of hydrolytic vanadium reaction on acidic ammonium salt precipitation has rarely been reported. Therefore, the whole precipitation process, including the effect of pH value, reaction temperature and vanadium concentration on precipitation result were clarified by analyzing the thermodynamic form of vanadate radicals in this work. Simultaneously, a study on technological parameters was inquired based on the theoretical analysis. The phase composition and crystal morphology of precipitates were also inspected using XRD and SEM-EDS. The results show the negative reaction of vanadium hydrolysis cannot be eliminated in the process of vanadium precipitation with acidic ammonia salt. When vanadium content is higher than 35g/L, Na in APV is easy to exceed 0.6%. Na mainly precipitates in V2O5·H2O in the formation of amorphous body or chemical absorption. The results in this work provide a fundamental guide for the application of high concentration vanadium precipitation technology.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
