无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ

无机盐工业 ›› 2020, Vol. 52 ›› Issue (9): 88-90.doi: 10.11962/1006-4990.2019-0519

• 环境·健康·安全 • 上一篇    下一篇

沉钒废水除硅制备冶金级氢氧化铬研究

滕晓慧(),孙丽月,庄立军()   

  1. 中信锦州金属股份有限公司,辽宁锦州 121005
  • 收稿日期:2020-03-15 出版日期:2020-09-10 发布日期:2020-09-27
  • 通讯作者: 庄立军
  • 作者简介:滕晓慧(1980— ),女,高级工程师,从事锆、铬、钒等冶金、化工研究与技术工作;E-mail: tengxiaohui2008@163.com

Study on preparation of metallurgical grade chromium hydroxide by removing silicon from vanadium wastewater

Teng Xiaohui(),Sun Liyue,Zhuang Lijun()   

  1. CITIC Jinzhou Metal Co.,Ltd.,Jinzhou 121005,China
  • Received:2020-03-15 Online:2020-09-10 Published:2020-09-27
  • Contact: Zhuang Lijun

摘要:

研究了以石灰为脱硅剂,采用石灰+片碱(氢氧化钠)沉淀法脱除沉钒废水中的硅,以除硅液为原料制备冶金级氢氧化铬。结果表明,先用石灰调节pH为7.5~8.0,再用片碱调节pH为9.5以上,除硅温度为55~65 ℃,除硅时间为20~30 min,在此条件下除硅率达到67.9%。沉钒废水用石灰除硅后制备的氢氧化铬硅含量低,以二氧化硅质量分数计达到4.2%,可用于冶炼焊剂用、铝剂用金属铬的原料。

关键词: 沉钒废水, 石灰, 硅, 氢氧化铬

Abstract:

Using lime powder as the desiliconizing agent,and the metallurgical grade chromium hydroxide was prepared from vanadium precipitation wastewater by lime powder+sodium hydroxide precipitation method.The results showed that the sili-con removal rate reached 67.9% under the conditions of first adjusting the pH at 7.5~8.0 with lime powder,then adjusting the pH above 9.5 with sodium hydroxide,the silicon removal temperature of 55~65 ℃ and the silicon removal time of 20~30 min. The prepared chromium hydroxide had a silicon content(calculated as SiO2 mass fraction) of 4.2% and a low silicon content by removing silicon with lime powder.Low-silicon chromium hydroxide can be used as chromium metal smelting raw materials for welding flux and aluminum.

Key words: wastewater from vanadium precipitation, lime powder, silicon, chromium hydroxide

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