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Decarbonisation of calcium carbonate in sodium hydroxide solutions under ambient conditions: effect of residence time & mixing rates†
Marco
Simoni, *a Theodore
Hanein, *a Chun Long
Woo,a Mark
Tyrer, b Magnus
Nyberg,c Juan-Carlos
Martinez,c Nestor I.Quintero-Mora,d John L.Provis aand Hajime
Kinoshita*a
* Corresponding authors
a Department of Materials Science và Engineering, University of Sheffield, Sheffield, UK E-mail: t.hanein
gmail.com
b Collegium Basilea, Institute of Advanced Study, Hochstrasse 51, 4053 Basel, Switzerland
c CEMEX Asia Research AG, Römerstrasse 13, 2555 Brügg, Switzerland
d CEMEX Operaciones Mexico, Constitution 444 pte. Monterrey, Mexico
The decarbonisation of Ca
CO3 is essential for the production of lime (Ca(OH)2 và Ca
Xem thêm: +20 Bảng Size L Nam Là Bao Nhiêu Kg ? Thông Số Chi Tiết Size L Nam Bao Nhiêu Kg Mặc Vừa
O), which is a commodity required in several large industries và the main precursor for cement production. CaCO3 is usually decarbonised at high temperatures, generating gaseous CO2 which will require post-process capture to minimise its release into the environment. We have developed a new process that can decarbonise Ca
CO3 under ambient conditions, while sequestering the CO2 as Na2CO3·H2O or Na2CO3 in the same stage. Here, the effects of increasing stirring rates & residence times on reaction efficiency of the key reaction occurring between Ca
CO3 và Na
OH solution are studied. It is shown that the reaction is enhanced at lower stirring rates and longer residence times up khổng lồ 300 seconds of tương tác between the reactants. The mass balance performed for Ca & CO2 revealed that up to lớn the 95% of the process CO2 embodied in Ca
CO3 was sequestered, with maximum capture rate assessed at nn moles CO2 captured per second of reaction progress. A deeper insight into the precipitation of Na2CO3·H2O or Na2CO3 under different reaction conditions was gained, and SEM-EDX analysis enabled the observation of the reaction front by detection of na migrating towards inner regions of partially-reacted limestone chalk particles.
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| Error: equation Ca CO3+Na OH=(Ca OH)2+Na2CO3 is an impossible reactionPlease correct your reaction or click on one of the suggestions below: Ca CO3 + Na OH = Ca(OH)2 + Na2CO3Instructions và examples below may help to lớn solve this problem You can always ask for help in the diễn đàn |
| Instructions on balancing chemical equations:Enter an equation of a chemical reaction and click "Balance". The answer will appear below Always use the upper case for the first character in the element name and the lower case for the second character.Examples: Fe, Au, Co, Br, C, O, N, F. Compare: teo - cobalt & CO - carbon monoxide To enter an electron into a chemical equation use - or e khổng lồ enter an ion, specify charge after the compound in curly brackets: +3 or 3+ or 3. Example: Fe3+ + I- = Fe2+ + I2Substitute immutable groups in chemical compounds to avoid ambiguity. For instance equation C6H5C2H5 + O2 = C6H5OH + CO2 + H2O will not be balanced, but Ph C2H5 + O2 = Ph OH + CO2 + H2O will Compound states |
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