Ion desorption device and operating method thereof

Abstract

The invention provides an ion desorption device and an operating method thereof. The ion desorption device at least comprises an ion desorption system, a liquid-solid separation system, a resin transportation system and a liquid transportation system; the ion desorption system mainly comprises an inner annular liquid distributor, an outer annular liquid distributor, a guide barrel and an outer barrel. A first circuit of liquid desorption agent enters the guide barrel by virtue of the inner annular liquid distributor to contact resin to be desorbed in the guide barrel at a bubbling bed and turbulent bed state; a second circuit of liquid desorption agent enters an annular gap between the outer barrel and the guide barrel by virtue of the outer annular liquid distributor to contact the resin to be desorbed at a moving bed state, and the resin to be desorbed circumferentially flows between the annular gap and the guide barrel. The first circuit of liquid desorption agent is used as fresh raw material liquid desorption agent or desorption liquid already discharged into a desorption liquid storage trough, so that a purpose of high desorption rate and high emission liquid concentration can be realized. The ion desorption device is simple, efficient, continuous in operation, flexible to control and widely applied to the fields such as separation and recovery of metal elements and salt-containing waste water treatment.

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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