公开(公告)号：US5395601A

公开(公告)日：1995-03-07

申请号：US865123

申请日：1992-04-08

Applicant: Qi-Jiang Situ ,  Ke-Ming Xu ,  Pei-Nian Huang ,  Xing-Qin Li ,  De-Han Zeng ,  Zhi-Fa Hu ,  Zhi-Quan Wen

Inventor： Qi-Jiang Situ ,  Ke-Ming Xu ,  Pei-Nian Huang ,  Xing-Qin Li ,  De-Han Zeng ,  Zhi-Fa Hu ,  Zhi-Quan Wen

IPC: B09B3/00 ,  A62D3/37 ,  A62D101/43 ,  C01G37/02 ,  C01G37/033 ,  C01G37/08 ,  C01G37/14 ,  C21B3/04 ,  C22B34/32 ,  B01D21/00

CPC classification number: C21B3/04 ,  C01G37/02 ,  C01G37/08 ,  C01G37/14 ,  C22B34/32 ,  C01P2006/80 ,  Y02P10/212 ,  Y02W30/542

Abstract: A re-calcination and extraction process for the detoxification and comprehensive utilization of chromic residues, comprising adding small amount of residue ore powder, sodium carbonate, or additionally, a certain amount of coke powder to the poisonous chromic residues, and calcining the mixture in a re-calcinating apparatus at 1000.degree.-1200.degree. C., for 30-60 minutes. The re-calcined grog is extracted with water, to obtain an extractive liquor containing sodium chromate. The extractive liquor can be used to produce chromium oxide, basic chromium sulfate or medium chrome yellow; while the extracted residues can be sintered at high temperatures with iron ore powder and coke to obtain a massive self-melting sintered iron, which can be further converted to a low-chromium cast iron. This process can thoroughly detoxify the chromic residues, effectively recover Cr2O3 and remove water-soluble Cr+6, whereby various important industrial materials are produced. The method brings very good economical and environmental benefits.

Abstract translation: 对铬残渣进行排毒和综合利用的再煅烧和提取工艺，包括向有毒的铬残渣中加入少量残渣矿粉，碳酸钠或另外的一定量的焦炭粉，并将混合物煅烧 再煅烧装置在1000℃-1200℃下搅拌30-60分钟。 用水萃取再煅烧的砂浆，得到含有铬酸钠的萃取液。 萃取液可用于生产氧化铬，碱性硫酸铬或中铬黄; 而提取的残渣可以在高温下用铁矿石粉末和焦炭烧结，得到大量自熔烧结铁，可以进一步转化为低铬铸铁。 该过程可彻底解毒铬残留物，有效回收Cr2O3并去除水溶性Cr + 6，从而生产出各种重要的工业材料。 该方法带来了非常好的经济和环境效益。