Patent ID: 9333441
Filing Date: 2016-05-10
CPC Classification: B01D

Claim Text:
1. A continuous material extraction system for continuously extracting valuable components from a solid material of diameter of 0.5 mm or less by means of a liquid solvent of temperature of 60° C. or higher, the system comprising: an extraction tank which is a sealed container being substantially parallelepiped, wherein in the longitudinal direction of the extraction tank, the extraction tank has a first end at which a material inlet is provided, and a second end, and a material outlet is provided at the first end or the second end; the upper portion of said extraction tank is provided with a solvent inlet, and the lower portion of said extraction tank is provided with a solution outlet; in the longitudinal direction of said extraction tank, the lower portion of said extraction tank is provided with an extraction bath for accommodating the solvent and the material, wherein said extraction bath is provided with one material conveying mechanism, which comprises one endless conveyor belt, and at least one driving roller as well as at least one driven roller surrounded by said endless conveyor belt, and an ultrasonic generator; wherein between said solvent inlet and said material conveying mechanism, said extraction tank is further provided with a solvent distributor for uniformly distributing solvent on said material conveying mechanism, the solvent distributor is arranged to be adjacent to the top of the extraction tank; wherein two sides of the distributor are provided with vertical separating plates having the function of guiding the flowing direction of the liquid; wherein said ultrasonic generator is arranged on the bottom of the inner side of the extraction bath; wherein a low pressure flash tank for recycling the solvent, and a liquid storage tank for storing the recycled solvent are further provided, wherein the solution outlet of said extraction tank is in fluid communication with an inlet of the lower portion of said low pressure flash tank through a pipeline, an outlet of the upper portion of said low pressure flash tank is in fluid communication with an inlet of the liquid storage tank through a pipeline, and an outlet of said liquid storage tank is in fluid communication with the solvent inlet of said extraction tank through a pipeline; wherein the material conveying mechanism is immersed in the liquid solvent, and the solid material is driven by the material conveying mechanism to pass a liquid spraying section comprising the solvent distributor for reflux extraction and ultrasonic extraction for 5-40 minutes; wherein the liquid solvent containing extracted substance flows out from the solution outlet and is sent to the solvent inlet after vacuum distillation by means of said low pressure flash tank and flows into the extraction bath via said distributor to continuously extract the material; wherein the second end of said extraction tank is further connected with a material recycling storehouse; said material conveying mechanism is further provided with an extension section extending toward the material recycling storehouse, wherein the vertical height of a terminal end of the extension section is higher than that of said material conveying mechanism in said extraction bath; wherein a finishing separation tank for further recycling the solvent is also included, wherein an outlet at the bottom of said low pressure flash tank is in fluid communication with an inlet of the lower portion of said finishing separation tank by means of a pipeline, a solvent outlet of the upper portion of said finishing separation tank is in fluid communication with the inlet of said liquid storage tank by means of a pipeline, and the lower portion of said finishing separation tank is further provided with an extracted substance outlet for discharging the extracted substance; wherein along the overall length of said endless conveyor belt and in the length direction of said endless conveyor belt, a plurality of material carriers are .s arranged consecutively and uniformly spaced apart, and each of said plurality of material carriers has an open upper portion and is made of a screen material, and each one of said plurality of material carriers is hinged on said endless conveyor belt around a hinge axis in a manner that it can pivot by at least 150 degrees, and said hinge axis is substantially parallel with the rotation axes of the driving roller and the driven roller; and wherein said liquid storage tank is further provided with a complementary inlet for complementing solvent to the system.