Heavy-metal-reduced post-industrial waste in cementitious materials and methods of making and using thereof
AssigneeWilliam Marsh Rice University
InventorsJames M. TOUR, Bing DENG, Satish NAGARAJAIAH, Wei MENG
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Abstract
Ultrafast flash Joule heating methods and systems, and more particularly, methods and systems for removing heavy metals from post-industrial waste, such as coal fly ash or bauxite residue. The use of the purified post-industrial waste includes forming cementitious materials that include the purified post-industrial waste and cement.
Claims55
A method of forming a cementitious material, wherein the method comprises:
- (a) forming a mixture comprising post-industrial waste and a conductive additive;
- (b) applying a voltage across the mixture, wherein
- (i) the voltage is applied in one or more voltage pulses,
- (ii) duration of each of the one or more voltage pulses is for a duration period, and
- (iii) the applying of the voltage removes at least 50% by weight of the heavy metals from the post-industrial waste to form a purified post-industrial waste;
- (c) mixing the purified post-industrial waste with cement to form a cementitious material.
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A system for forming a cementitious material, wherein the system comprises:
- (a) a source of a mixture comprising post-industrial waste and a conductive additive;
- (b) a cell operably connected to the source such that the mixture can be flowed into the cell and held under compression;
- (c) electrodes operatively connected to pressure cell;
- (d) a flash power supply for applying a voltage across the mixture, wherein
- (i) the voltage is applied in one or more voltage pulses,
- (ii) duration of each of the one or more voltage pulses is for a duration period, and
- (iii) the applying of the voltage removes at least 50% by weight of the heavy metals from the post-industrial waste to form a purified post-industrial waste;
- (e) a collector operatively connected to the cell to collect the purified post-industrial waste;
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- (f) a mixer operable for mixing the collected purified post-industrial waste with cement to form the cementitious material.
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Dependencies are inferred from the claim text.