The stripper is used as the key equipment to further reduce the residual solution of mixed oil after the first and second steaming in the leaching workshop. The two most common types of strippers are layered disc strippers and tubular strippers. The layered disc stripper has simple structure, convenient operation, good process effect and stable performance. The tubular stripper has a simple structure, is easy to manufacture and install, consumes less steel, is easy to operate and maintain, but has a small processing capacity, and is suitable for small leaching oil plants.

  The main structure of the layered disc stripper is composed of a cylindrical shell with jacket heating and heat preservation, a disc group, a steam injection device, a vapor-liquid separation device and other structures. The disc set consists of an overflow disc, a conical distribution disc and a disc collecting disc. The disc is made of stainless steel, which has a long service life and is easy to clean. In addition, it is also equipped with a sight glass and a cleaning hole for observation and cleaning.

  The tubular stripper is mainly composed of preheater, steam injection tube, tower body and other parts. The preheater is a casing heat exchanger. The indirect steam is fed into the jacket to heat the mixed oil in the inner pipe, and the direct steam is ejected from the nozzle. The tower body is made of two seamless steel pipes, and the pipe ends are welded with flange. The outer pipes of the tower body are respectively provided with indirect steam inlet pipes and flashing steam outlet pipes.

Stripping is a physical process, which uses a gas medium to destroy the original vapor-liquid balance and establish a new vapor-liquid equilibrium state, so that a certain component in the solution can be resolved due to the reduction of partial pressure. The stripping tower uses superheated direct steam to heat the mixed oil, and utilizes the difference in boiling point between the oil and the solvent to evaporate the solvent in the mixed oil to achieve the purpose of separating the oil and the solvent.

The thick mixed oil enters from the inlet pipe of the upper tower body, and the first scene. The overflow pan of the first set of discs is filled, and the thick mixed oil flowing out of the overflow pan forms a thin liquid film on the surface of the conical disc to flow downwards, and then flows to the overflow of the second set of discs after being received by the annular disc. The overflow is distributed into a thin film and flows downwards, and the mixed oil is poured into a liquid curtain from top to bottom, while the mixed gas composed of direct steam and solvent travels from bottom to top and contacts with layers of liquid curtains in reverse, so that Extract the solvent from the mixed oil.