In steel production, stainless steel production generates a large amount of pickling sludge, which contains high concentrations of valuable metal ions such as Fe3+, Cr3+, and Ni2+. If this large amount of sludge is not promptly treated, it will seriously affect the company's normal production and also cause a waste of resources.
Experiments have shown that sludge requires acid leaching to produce a sulfuric acid leachate. However, this leachate is a strong acid, necessitating solvent extraction to separate and recover the valuable metals in the leachate and improve the purity of the separated metals. The CWL-M centrifugal extractor developed and produced by Zhengzhou Tiei Extraction uses solvent extraction to extract and separate the organic phase from the aqueous feed. It has high extraction efficiency, simple operation, low power consumption, and continuous production capabilities, and has been widely used in many fields.
During the experiment, it was found that the extraction effects of sulfuric acid leachate using non-saponifiable P204 and saponifiable P204 extractants were different.
Non-saponifiable Extraction Experiment
First, the pickling sludge produced in the stainless steel production process is leached with sulfuric acid. The obtained sulfuric acid leaching liquid is extracted with a non-saponifiable extractant using the CWL-M centrifugal extractor. The pH of the sulfuric acid leachate is adjusted, and then the non-saponifiable P204 extractant and the sulfuric acid leachate are injected into the centrifugal extractor in a specific ratio. The leachate and extractant mix and transfer under the shear force generated by the rotating drum. The mixed liquid is rapidly separated by the centrifugal force generated by the high-speed operation of the drum. The separated organic phase and raffinate are discharged through their respective phase outlets, completing the extraction process.
Saponification Extraction Experiment
When conducting saponification extraction experiments, the pickling sludge also needs to be leached with sulfuric acid, the pH value of the leaching solution is adjusted, and then the saponified P204 extractant and the sulfuric acid leaching solution are injected into the continuous extraction equipment in proportion. After the mixed mass transfer and separation of the two-phase liquid, it is discharged from the body to complete the extraction and separation process.
Experiments have shown that different extractants have different extraction effects on aqueous feed. In practical applications, it is necessary to select appropriate extractants and extraction equipment based on the characteristics of the extract and the extraction requirements. The liquid-liquid separation equipment centrifugal extractor developed and produced by Zhengzhou Tiei Extraction are available in different models. Customers can choose according to the processing volume of the extract and the feed-liquid system when purchasing. Welcome contact us for more details.
Email: sales@tieiextraction.com
Whatsapp: +86 19069612820
