Method for eluting calcium from steelmaking slag, and method for collecting calcium from steelmaking slag
a technology of steelmaking slag and eluting calcium, which is applied in the direction of sustainable waste treatment, solid waste management, manufacturing converters, etc., can solve the problems of high cost of purchasing acids and disposing, difficult reuse of salts of the above compounds with the acid generated in the method, and disadvantageous high cost of processing toxic chloride gas generated during the heating process
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first embodiment
Modification of First Embodiment
[0084]In the first embodiment, the contact step may be a step (hereinafter, also referred to as a “modified contact step”) of bringing steelmaking slag subjected to the magnetic separation into contact with an aqueous solution containing carbon dioxide while fracturing or pulverizing the steelmaking slag, or grinding the surface of the steelmaking slag (hereinafter, also collectively and simply referred to as a “fracturing or the like”).
Modified Contact Step: Bringing Steelmaking Slag into Contact With CO2 Aqueous Solution While Fracturing or the Like
[0085]The elution of Ca from steelmaking slag occurs upon contact of Ca compounds or Ca with a CO2 aqueous solution in the vicinity of the surface of the steelmaking slag or inside the steelmaking slag. Therefore, during the contacting of steelmaking slag with a CO2 aqueous solution, subjecting the steelmaking slag in contact with the CO2 aqueous solution to fracturing or the like increases the surface ar...
second embodiment
[0090]Each of FIGS. 2 to 5 is a flowchart of a method according to another embodiment of the present invention, for eluting Ca from steelmaking slag. As illustrated in FIGS. 2 to 5, each method according to the present embodiment for eluting Ca from steelmaking slag includes a step of subjecting steelmaking slag to magnetic separation (Step S110: magnetic separation step); at least one of steps of subjecting the steelmaking slag to hydration treatment (Steps S130-1 to S130-5: hereinafter also referred to as “hydration step” each); and bringing the steelmaking slag subjected to the magnetic separation and hydration treatment into contact with a CO2 aqueous solution (Step S120: contact step). The description for the magnetic separation step and contact step is omitted in the present embodiment as these steps can be performed in the same manner as in the above described first embodiment.
Hydration Step: Hydration Treatment of Steelmaking Slag
[0091]The present step may be performed after...
first modification
of Second Embodiment
[0124]When the hydration step is the immersion and stirring in the first to third modes of the second embodiment, the immersed steelmaking slag may be subjects to the fracturing or the like at the same time (hereinafter also referred to as “modified hydration step”).
Modified Hydration Step: Bringing Steelmaking Slag into Contact With CO2 Aqueous Solution While Fracturing or the Like
[0125]Reactions during the above described hydration treatment occur upon contact of Ca compounds with water in the vicinity of the surface of the steelmaking slag or inside the steelmaking slag. While water permeates through the steelmaking slag to some extent, a larger amount of water contacts the vicinity of the surface. Ca hydrates is thus more likely to be generated in the vicinity of the surface of the steelmaking slag. In addition, when components contained in the steelmaking slag dissolve in the water used for the hydration treatment, for example, Fe, Al, Si and Mn, and / or hydr...
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Abstract
Description
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Application Information
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