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METHOD FOR TREATING CR-CONTAINING PICKLING SLUDGE IN SLAG BATH
The present disclosure provides a method for treating Cr-containing pickling sludge in a slag bath, including the following steps: 1, adding a reducing agent, lime and a fluxing agent to the Cr-containing pickling sludge and fully mixing; 2, pelletizing the mixture by using a pelletizer and drying at a certain temperature; 3, putting the dried sludge pellets from step (2) into the high-temperature metallurgical slag for a slag bath reaction; and 4, subjecting cooled slag to crushing, screening and magnetic separation, thus separating out metal particles. Under the conditions of this method, the Cr-containing pickling sludge is thoroughly reduced and detoxified by using the high-temperature metallurgical slag so that most of sulfur in the sludge is immobilized in the slag phase. No secondary pollution is caused during the process and valuable metal elements such as Cr and Fe in the high-temperature slag and the sludge can be fully reduced to the metal phase and then recovered by magnetic separation. The treatment method provided in the present disclosure is simple to operate and can be implemented during a steelmaking process without secondary emission. Thus, online recycling and emission reduction at source of the Cr-containing pickling sludge are actually realized.
METHOD FOR TREATING CR-CONTAINING PICKLING SLUDGE IN SLAG BATH
The present disclosure provides a method for treating Cr-containing pickling sludge in a slag bath, including the following steps: 1, adding a reducing agent, lime and a fluxing agent to the Cr-containing pickling sludge and fully mixing; 2, pelletizing the mixture by using a pelletizer and drying at a certain temperature; 3, putting the dried sludge pellets from step (2) into the high-temperature metallurgical slag for a slag bath reaction; and 4, subjecting cooled slag to crushing, screening and magnetic separation, thus separating out metal particles. Under the conditions of this method, the Cr-containing pickling sludge is thoroughly reduced and detoxified by using the high-temperature metallurgical slag so that most of sulfur in the sludge is immobilized in the slag phase. No secondary pollution is caused during the process and valuable metal elements such as Cr and Fe in the high-temperature slag and the sludge can be fully reduced to the metal phase and then recovered by magnetic separation. The treatment method provided in the present disclosure is simple to operate and can be implemented during a steelmaking process without secondary emission. Thus, online recycling and emission reduction at source of the Cr-containing pickling sludge are actually realized.
METHOD FOR TREATING CR-CONTAINING PICKLING SLUDGE IN SLAG BATH
ZHANG YANLING (author) / ZHAO ZHENG (author) / XING YI (author) / GAO JINTAO (author) / WU TUO (author) / YUAN FANG (author)
2021-08-26
Patent
Electronic Resource
English
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