System for CO2 storage and utilization of concrete mixing plant and method thereof

A system for CO2 storage and utilization of a concrete mixing plant, comprising a slurry making module, a cyclic grinding module and a material storage and application module, wherein,

• the slurry making module is configured to mix a concrete mixing plant waste slurry, a natural ore and an industrial aid to produce a composite slurry and convey the composite slurry to the cyclic grinding module;
• the cyclic grinding module comprises a grinding machine, a material discharge component and a CO2 circulating component, a mixing element is disposed inside the grinding machine, the mixing element comprises a hollow rotary shaft and medium balls, the material discharge component comprises a gas storage bin and a slurry bin communicated with each other and disposed up and down, the gas storage bin is connected sequentially with the grinding machine and the CO2 circulating component, the gas storage bin is configured to supply a gas containing CO2 to the CO2 circulating component, the CO2 circulating component is configured to convey the gas to the grinding machine and recover a tail gas containing CO2 generated during a grinding process of the gas containing CO2 and the medium balls for the composite slurry in the grinding machine, and the grinding machine is configured to grind and prepare the composite slurry in the presence of the gas containing CO2 and the medium balls into a carbon-mineralized slurry and convey the carbon-mineralized slurry to the slurry bin of the material discharge component;
• the material storage and application module comprises a material storage bin and a mixing machine connected with each other, and the material storage bin is configured to receive and store the carbon-mineralized slurry from the slurry bin, and the mixing machine is configured to mix and prepare the carbon-mineralized slurry into a commodity concrete;
• the slurry making module comprises a sand stone separating machine, a sand removing machine and a slurry making machine connected sequentially, the slurry making machine comprises a machine body, a slurry outlet at an outer side of the machine body, a material-adding opening on a top of the machine body, a first rotary shaft in a middle of the top of the machine body and a first motor on the top of the machine body, rotary blades are disposed at a lower end of the first rotary shaft and extended into the machine body, and an upper end of the first rotary shaft is connected with a drive part of the first motor through a bevel gear;
• the grinding machine comprises a cylinder body, a material inlet at a bottom of the cylinder body, a screen in the cylinder body, a sealed console on a top of the cylinder body and the mixing element in the sealed console, the material inlet is connected with the slurry outlet of the slurry making machine, the screen divides an interior of the cylinder body into an above-screen finished product bin and an under-screen grinding bin, a gas inlet provided with a gas pipe is opened on a top of the sealed console, the mixing element further comprises a second motor and a drive rotary rod, an output end of the second motor is fixedly connected with the drive rotary rod, the drive rotary rod is fixedly connected with the hollow rotary shaft, a top of the hollow rotary shaft is connected with the gas pipe, a lower end of the hollow rotary shaft extends to the grinding bin, centrifugal blades and uniformly-distributed gas outlets are disposed on the hollow rotary shaft in the grinding bin, and a first material outlet is disposed at an outer side of the finished product bin;
• a slurry inlet is disposed at a side of the gas storage bin of the material discharge component, the slurry inlet is connected with the first material outlet of the finished product bin, a gas relief opening and a gas pressure meter are disposed on a top of the gas storage bin, the CO2 circulating component is provided with a circulating gas inlet and a circulating gas outlet, the gas relief opening of the gas storage bin is connected with the circulating gas inlet of the CO2 circulating component, the circulating gas outlet is connected with the gas inlet of the grinding machine, and an outlet end of the slurry bin of the material discharge component is connected with a U-shaped pipe;
• a feed pipe connected with the U-shaped pipe is disposed at an upper end of an outer side of the material storage bin, and a second material outlet connected with the mixing machine is disposed on a top of the material storage bin.