US 11,866,803 B2
Treatment system and method for deep utilization of dolomite resources
Liyuan Chai, Changsha (CN); Qingwei Wang, Changsha (CN); Xiaobo Min, Changsha (CN); Qingzhu Li, Changsha (CN); and Meiqing Shi, Changsha (CN)
Assigned to Central South University, Changsha (CN)
Filed by Central South University, Changsha (CN)
Filed on Nov. 30, 2022, as Appl. No. 18/072,329.
Application 18/072,329 is a continuation of application No. PCT/CN2022/086671, filed on Apr. 13, 2022.
Claims priority of application No. 202111595493.4 (CN), filed on Dec. 24, 2021.
Prior Publication US 2023/0203620 A1, Jun. 29, 2023
Int. Cl. C22B 26/00 (2006.01); C22B 26/22 (2006.01); C22B 1/02 (2006.01)
CPC C22B 26/22 (2013.01) [C22B 1/02 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A treatment system for deep utilization of dolomite resources, comprising a primary calcination device, a carbon dioxide capture device, a digestion device, a carbonization separation device, a pyrolysis device and a secondary calcination device;
wherein the primary calcination device comprises a dolomite calciner performing the indirect calcination of dolomite, a plurality of hoardings and an exhaust pipe, and the dolomite calciner comprises a blanking bin, a furnace body and material discharge bins sequentially provided from top to bottom;
the furnace body is covered with a thermal insulation layer on its outer wall; the blanking bin is provided above a feed port of the furnace body; a blanking port of the blanking bin is correspondingly provided through the feed port; the blanking port has a smaller size than the feed port; the feed port is used simultaneously as a exhaust port of the furnace body;
an exhaust chamber is formed between the plurality of hoardings, the top of the furnace body and the outer wall of a blanking bin; the feed inlet of the dolomite calciner, the blanking port of the blanking bin and an exhaust port of the dolomite calciner are all in communication with the exhaust chamber which is in communication with the gas inlet of the carbon dioxide capture device through the exhaust pipe; the exhaust chamber is in communication with the interior of the furnace body through a feed port;
wherein the blanking bin comprises a plurality of blanking hoppers, each of which is provided with one blanking port; sealing connection is formed between the side wall top ends of two adjacent blanking hoppers, and between the blanking hoppers and the plurality of hoardings;
the material discharge bins are provided with circulating water cooling assemblies on their outer walls; a hot water outlets of the circulating water cooling assemblies are in communication with a water bath hot water inlet of a pyrolysis kettle through a circulating water return pipeline, and a heated circulating water is used for heat supply to the pyrolysis kettle;
the carbon dioxide capture device comprises a first gas outlet, a second gas outlet, a recovery system, a first recovery pipeline and a second recovery pipeline, and the second gas outlet is in communication with the recovery system;
the carbonization separation device comprises a carbonization reaction tank whose gas inlet is in communication with the carbon dioxide capture device through the first gas outlet;
the carbonization separation device further comprises a gas-liquid mixing reactor and a circulating pump;
the carbonization reaction tank is provided with a feeding port and a gas circuit circulation outlet at its top, and is provided with a water circuit circulation outlet and a drain port at its bottom; and a drain valve is installed at the drain port;
the gas-liquid mixing reactor comprises a gas-liquid mixing tube, a feed tube and a gas jet tube; wherein the gas-liquid mixing tube is installed inside the carbonization reaction tank, and is provided with a gas jet tube installation port in its side wall upper part; and the lower end of the gas-liquid mixing tube is configured to be in communication with the interior of the carbonization reaction tank;
the feed tube sequentially passes through the top of the carbonization reaction tank and a seal from top to bottom, and then extends into the interior of the gas-liquid mixing tube; and the material outlet of the feed tube is located below the gas jet tube installation port;
the gas inlet of the gas jet tube is simultaneously in communication with the first gas outlet and the gas circuit circulation outlet, and the exhaust port of the gas jet tube is installed at the gas jet tube installation port;
the liquid inlet of the circulating pump is in communication with the water circuit circulation outlet, and the liquid outlet of the circulating pump is in communication with the feed port of the feed tube;
the gas-liquid mixing reactor further comprises a convection mixing jet tube which is in communication with the outlet of the gas-liquid mixing tube and the carbonization reaction tank, the convection mixing jet tube is provided below the gas-liquid mixing tube, and the convection mixing jet tube is provided with a forward flow mixer and a reverse flow mixer sequentially from top to bottom;
the pyrolysis device comprises the pyrolysis kettle and a vacuum pump, the vacuum pump is in communication with the pyrolysis kettle, and the first recovery pipeline is in communication with the gas outlet of the pyrolysis kettle and the gas inlet of the carbon dioxide capture device; wherein a decomposition mother liquor generated via pyrolysis reaction in the pyrolysis device returns to the liquid inlet of the digestion device through the decomposition mother liquor return pipeline; and
the secondary calcination device comprises a secondary calciner whose flue gas outlet is in communication with the gas inlet of the carbon dioxide capture device through the second recovery pipeline.