An ion desorption device and its operating method

Abstract

The invention provides an ion desorption device and an operation method thereof, at least including an ion desorption system, a liquid-solid separation system, a resin delivery system and a liquid delivery system; the ion desorption system mainly includes an inner ring liquid distributor, an outer ring liquid distributor, Guide tube and outer cylinder. The first liquid desorbent enters the guide cylinder through the inner ring liquid distributor, and contacts with the resin to be desorbed in the guide cylinder in the state of bubbling bed and turbulent bed; the second liquid desorbent enters the outer ring through the outer ring liquid distributor. In the annular gap between the cylinder body and the guide tube, the resin to be desorbed is in contact with the moving bed state, and the resin to be desorbed circulates and flows between the annular gap and the guide tube. By setting the first liquid desorbent as fresh raw material liquid desorbent or desorbed liquid that has been discharged into the desorbed liquid storage tank, the goals of high desorption rate and high discharge liquid concentration can be achieved respectively. The device of the invention is simple and efficient, has continuous operation and flexible regulation, and is widely applicable to the fields of separation and recovery of metal elements and treatment of salty waste water.

Description

technical field [0001] The present invention relates to a desorption device and its operation method for treating the resin to be desorbed which has adsorbed certain target metal ions through ion exchange technology, and in particular to an ion desorption device with continuous, flexible operation and high desorption efficiency and its operation method , which belongs to the field of separation and recovery of metal elements and treatment of saline wastewater. Background technique [0002] In industries such as metallurgy or inorganic salt production, the treated liquid or the discharged waste liquid often contains a certain amount of metal ions, such as chromium ions in electroplating wastewater and potassium ions in potassium carbonate wastewater. If they are discharged directly, not only It pollutes the environment and wastes a lot of metal resources. Therefore, the recovery of metal ions is an important measure to achieve efficient resource utilization, energy saving an...

AI Technical Summary

Problems solved by technology

Currently, the commonly used ion exchange equipment in the industry includes fixed bed, moving bed and fluidized bed. Although the fixed bed can meet the processing requirements, there are also shortcomings such as complex pipelines, many valves, and poor continuity of operation.

In this regard, some researchers have proposed continuous moving bed or fluidized bed ion exchange equipment and operating methods thereof, such as U.S. Kings (Higgins) ring ion exchange equipment, Japan's Ashahi (Asahi) moving bed ion exchange equipment, Canada's Himsley (HimsIey) tower, domestic Tianjin University developed the reversible tray multi-stage fluidized bed (TPCIX), etc. Although the above-mentioned ion exchange equipment has been successfully applied in industry, there are also equipment and operation Complexity, low ion exchange efficiency and other issues, and mostly focus on the adsorption process of ion exchange

Although both adsorption and desorption belong to the ion exchange process in principle, the technological purposes to be achieved by the two processes are different, so the equipment and operation control methods are different, and the equipment and operation methods developed solely for the characteristics of the desorption process are reported relatively. less

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