Abstract: The present invention discloses the systems of producing calcium and magnesium carbonate from the Ca/Mg containing solution leached by a CO2-based hydrometallurgical process which includes: a precipitation reactor that the Ca/Mg containing leached solution is continuously added and fully mixed with the alkaline reagent at specific mole ratio into the precipitation reactor and the reactor also comprises a CO2 bubbling module where CO2 is captured and recirculated from the thermal decomposition process as needed; a solid-liquid separation unit that the treated slurry is treated by the solid-liquid separation unit to produce precipitated calcium and magnesium carbonate products where the recirculating water is recycled back into the precipitation reactor; a thermal decomposition unit that the calcium and magnesium carbonate products is calcined by the thermal decomposition unit to produce an alkaline reagent and the alkaline reagent is recycled back into the precipitation reactor for the next batch of reaction.

Abstract: A coupling system of CO2 capture in flue gas and CO2 mineralization based on industrial solid waste includes: 1) an adsorption reaction device configured to treat flue gas with the embedded adsorbents, 2) a thermal decomposition device designed to decompose the first carbonate products to oxides and carbon dioxide, wherein the produced oxides are circulated to the adsorption reaction device, and 3) an industrial solid waste mineralization system configured to treat the deactivated oxides and the as-produced carbon dioxide. The coupling system can not only realize carbon capture and utilization, but also can enable the reuse of waste and the production of high-quality carbonates. Meanwhile, the carbon capture line is also convenient to be organically integrated with the production line of carbon mineralization system based on industrial solid waste, reducing the cost of the whole process.

Abstract: A coupling system of CO2 capture in flue gas and CO2 mineralization based on industrial solid waste includes: 1) an adsorption reaction device configured to treat flue gas with the embedded adsorbents, 2) a thermal decomposition device designed to decompose the first carbonate products to oxides and carbon dioxide, wherein the produced oxides are circulated to the adsorption reaction device, and 3) an industrial solid waste mineralization system configured to treat the deactivated oxides and the as-produced carbon dioxide. The coupling system can not only realize carbon capture and utilization, but also can enable the reuse of waste and the production of high-quality carbonates. Meanwhile, the carbon capture line is also convenient to be organically integrated with the production line of carbon mineralization system based on industrial solid waste, reducing the cost of the whole process.

Abstract: A coupling system of copper slag recycling and CO2 mineralization process based on industrial solid waste includes the following steps: obtaining copper slags, performing a slag forming treatment, obtaining reforming slags, obtaining sponge iron, coupling the reforming slag with a CO2 mineralization process based on industrial solid waste, and coupling the CO2 generated in the process of obtaining sponge iron with the CO2 mineralization process based on industrial solid waste. The system includes a slag forming treatment device, a secondary treatment device, a first coupling device, and a second coupling device. The coupling system couples the recycling of copper slag with the existing CO2 mineralization process based on industrial solid waste. Various production lines can be organically integrated in a green and clean manner for both reforming slag and flue gas.

Abstract: The present invention is a CO2 based hydrometallurgical multistage reaction and separation system comprising: a pre-washing device configured to fully mix the feedstock, such as industrial solid waste, mineral and mine tailings with auxiliary reagents and water at specific ratio, a reactor configured to treat the washed slurry with CO2 bubbling and discharge the treated slurry to the next stage, multistage separators configured to separate solid particles from treated slurry and recycle the unreacted solids back into the pre-washing device, a by-product preparation device configured to generate calcium and magnesium based products from filtrate containing target elements, a water recirculating device configured to recycle the remaining liquor back to the system. The present invention ensures the whole system is able to continuously and consistently react at maximum capacity through continuous slurry feeding and CO2 bubbling into the reactors which also enables multistage circulating reaction.

Abstract: The present invention is a CO2 based hydrometallurgical multistage reaction and separation system comprising: a pre-washing device configured to fully mix the feedstock, such as industrial solid waste, mineral and mine tailings with auxiliary reagents and water at specific ratio, a reactor configured to treat the washed slurry with CO2 bubbling and discharge the treated slurry to the next stage, multistage separators configured to separate solid particles from treated slurry and recycle the unreacted solids back into the pre-washing device, a by-product preparation device configured to generate calcium and magnesium based products from filtrate containing target elements, a water recirculating device configured to recycle the remaining liquor back to the system. The present invention ensures the whole system is able to continuously and consistently react at maximum capacity through continuous slurry feeding and CO2 bubbling into the reactors which also enables multistage circulating reaction.

Abstract: The present invention discloses the systems of producing calcium and magnesium carbonate from the Ca/Mg containing solution leached by a CO2-based hydrometallurgical process which includes: a precipitation reactor that the Ca/Mg containing leached solution is continuously added and fully mixed with the alkaline reagent at specific mole ratio into the precipitation reactor and the reactor also comprises a CO2 bubbling module where CO2 is captured and recirculated from the thermal decomposition process as needed; a solid-liquid separation unit that the treated slurry is treated by the solid-liquid separation unit to produce precipitated calcium and magnesium carbonate products where the recirculating water is recycled back into the precipitation reactor; a thermal decomposition unit that the calcium and magnesium carbonate products is calcined by the thermal decomposition unit to produce an alkaline reagent and the alkaline reagent is recycled back into the precipitation reactor for the next batch of reaction.

Abstract: Systems of producing hydrogen and biochar from biomass assisted by iron and steel slag extract include: a pretreatment system that the reactants, including the biomass, iron-based catalyst and alkaline reagent, are pretreated and fully mixed at specific ratios in the pretreatment system; thermal reactor that the mixed reactants from the pretreatment device are transferred into and fully reacted in the thermal reactor; a solid residue collector that the solid residue is collected by the solid residue collector at the discharge outlet of the thermal reactor after the reacted mixture is separated; a gas collection system that he generated hydrogen-based gas is collected by the gas collection system from the exhaust port of the thermal reactor.