Rocks and aggregate, and methods of making and using the same
First Claim
1. A synthetic aggregate comprising a CO2-sequestering component comprising one or more carbonate compounds which, when the aggregate is subjected to a protocol for measuring carbon isotopic fractionation value (δ
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13C) consisting essentially of;
(i) digestion of the aggregate in 2M HClO4 (perchloric acid) to produce CO2 gas;
(ii) passing the gas through a gas dryer to produce a dried gas;
(iii) analyzing the dried gas using mass spectrometry to determine a ratio of the 13C to 12C in the carbon dioxide gas;
(iv) comparing the ratio of 13C to 12C determined in (iii) to a standard value of PeeDee Belemnite (PDB); and
(v) determining a value for carbon isotopic fractionation, expressed as ‰
, from the comparison of (iv);
the aggregate is characterized by having a δ
13C value less than −
10‰
, reflective of a fossil fuel origin for the carbon, and wherein the aggregate comprises at least 80% w/w of one or more carbonate compounds and has a hardness of at least 3 on the Mohs hardness scale, and further wherein the aggregate has an average particle size of 0.05 in. or greater.
3 Assignments
0 Petitions
Accused Products
Abstract
Compositions comprising synthetic rock, e.g., aggregate, and methods of producing and using them are provided. The rock, e.g., aggregate, contains CO2 and/or other components of an industrial waste stream. The CO2 may be in the form of divalent cation carbonates, e.g., magnesium and calcium carbonates. Aspects of the invention include contacting a CO2 containing gaseous stream with a water to dissolve CO2, and placing the water under precipitation conditions sufficient to produce a carbonate containing precipitate product, e.g., a divalent cation carbonate.
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Citations
8 Claims
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1. A synthetic aggregate comprising a CO2-sequestering component comprising one or more carbonate compounds which, when the aggregate is subjected to a protocol for measuring carbon isotopic fractionation value (δ
-
13C) consisting essentially of;
(i) digestion of the aggregate in 2M HClO4 (perchloric acid) to produce CO2 gas; (ii) passing the gas through a gas dryer to produce a dried gas; (iii) analyzing the dried gas using mass spectrometry to determine a ratio of the 13C to 12C in the carbon dioxide gas; (iv) comparing the ratio of 13C to 12C determined in (iii) to a standard value of PeeDee Belemnite (PDB); and (v) determining a value for carbon isotopic fractionation, expressed as ‰
, from the comparison of (iv);the aggregate is characterized by having a δ
13C value less than −
10‰
, reflective of a fossil fuel origin for the carbon, and wherein the aggregate comprises at least 80% w/w of one or more carbonate compounds and has a hardness of at least 3 on the Mohs hardness scale, and further wherein the aggregate has an average particle size of 0.05 in. or greater.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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13C) consisting essentially of;
Specification