Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第24卷    第1期    总第178期    2014年1月

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文章编号:1004-0609(2014)01-0279-07
铬盐无钙焙烧工艺铬酸钠中性液铁盐除钒
杨得军1, 2,王少娜2,陈晓芳2,郑诗礼2,李世厚1

(1. 昆明理工大学 国土资源工程学院,昆明 650093;
2. 中国科学院 过程工程研究所 湿法冶金清洁生产技术国家工程实验室,北京100190
)

摘 要: 针对铬盐无钙焙烧工艺浸出液除钒现行钙盐沉钒法钙盐加入量大、需反复调节pH值、脱钒渣含铬酸钙等问题,提出采用铁盐作为沉钒剂进行除钒。考察铁盐加入量、pH值和温度等主要因素对钒脱除的影响,得到了最佳工艺条件,且终液钒浓度低于0.08 g/L,满足后续工艺要求。铁盐除钒可在较宽的pH值范围内操作,不需反复调节溶液pH值。渣相分析表明:脱钒渣为吸附钒酸根的氢氧化铁,其中不含铬,进一步探讨氢氧化铁对钒的吸附机理,确定钒酸根通过内层络合方式吸附在氢氧化铁表面。

 

关键词: 铬酸钠;除钒;无钙焙烧;氢氧化铁;吸附

Removing vanadium from sodium chromate neutral liquid by non-calcium roasting technology with chromium salt
YANG De-jun1, 2, WANG Shao-na2, CHEN Xiao-fang2, ZHENG Shi-li2, LI Shi-hou1

1. Faculty of Land and Resource, Kunming University of Science and Technology, Kunming 650093, China;
2. Key Laboratory of Green Process and Engineering, Institute of Process Engineering,
Chinese Academy of Science, Beijing 100190, China

Abstract:According to the current existing problem in the vanadium precipitating process in calcium salt by non-calcium roasting technology with chromium salt, such problems as large amount of calcium salt, repeatedly adjusting the pH value, slag containing calcium chromate and other issues, iron salts were used as precipitating agent to remove vanadium. The amount of iron salt added, pH value, temperature and other major factors on the impact of vanadium removal were investigated, the optimum conditions are that the vanadium concentration in final liquid is less than 0.08 g/L, which satisfies the follow-up process requirements. Utilizing iron salt to remove vanadium can be operated in wide pH range, without repeatedly adjusting the pH value. By analyzing, the slag phase is ferric hydroxide, which adsorbs vanadium, containing no chromium. And by further exploring against adsorption mechanism, vanadium is adsorbed on the surface of the iron hydroxide by inner layer complexation.

 

Key words: sodium chromate; vanadium removal; non-calcium roasting; ferric hydroxide; adsorption

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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