Chromium is an important element widely used in metal plating and chemical industry. However, the discharge of chromium-containing wastewater poses a serious threat to the environment, especially the excessive hexavalent chromium will cause great harm to biological and human health. Therefore, efficient removal of chromium in wastewater is particularly important. The combined extraction centrifugal extractor provides a novel technique for the extraction of chromium.

Environmental characteristics of chromium

Chromium is found in water mainly in the form of trivalent chromium (Cr³ +) and hexavalent chromium (Cr⁶ +). Hexavalent chromium is highly toxic, and the accumulation in the water body will cause serious impact on aquatic organisms, and may pose a threat to human health through the food chain, so the removal and treatment of chromium is very urgent.

Working principle of combined extraction centrifugal extractor

The combined extraction centrifugal extractor uses centrifugal force to efficiently separate chromium ions from wastewater. The process includes:

1. Feed operation: Input the wastewater containing chromium into the equipment.

2. Centrifugal separation: The equipment is rotated at high speed, so that the chromium ion settles to the bottom due to its density.

3. Precipitation collection: The settling chromium precipitation is collected through the discharge system, which is convenient for subsequent treatment.

Optimized extraction conditions

In order to improve the extraction efficiency of chromium, the following conditions need to be optimized:

1. Centrifugal speed: appropriately increase the speed can accelerate the deposition of chromium, the recommended range is 4000-8000 rpm.

2. Processing time: Extending the processing time can usually improve the extraction rate of chromium, and the recommended time is 20-30 minutes.

3. pH adjustment: The separation effect of chromium is better in an acidic environment (pH 4-6).

Follow-up treatment and resource recovery of chromium

The extracted chromium precipitates can be treated by chemical reduction or roasting to realize the recovery and reuse of chromium, which can not only reduce environmental pollution, but also provide raw materials for related industries.

The research on extracting chromium from wastewater by high-efficiency combined extraction centrifugal extractor provides important technical support for chromium pollution control. With the continuous progress of technology, its application prospect will be more extensive.