Process for producing gas from mineral ore
AssigneeSolvay SA
InventorsFrancis Coustry, Perrine Davoine, Claude Criado, Thoi-Dai Chau
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Abstract
Process for producing a gas from a mineral ore, and in particular from trona ore, said gas having a carbon dioxide concentration of more than 25 volume percents expressed on dry gas, and a quantity of volatile organic compounds of less than 700 mg per kilogram of generated carbon dioxide. The process comprises the steps of crushing the trona ore, introducing crushed trona in a rotary calcining drum with indirect heating, calcining the crushed trona in the calcining device, collecting the calcined trona from calcining device and collecting the gas generated by the trona ore calcination from calcining device in order to constitute the produced gas.
Claims22
A process for producing a gas from a mineral ore, and in particular from trona ore, said produced gas having a carbon dioxide concentration of more than 25 volume percents expressed on dry gas, and a quantity of volatile organic compounds of less than 700 mg per kilogram of generated carbon dioxide, said process comprising the steps of:
- a) crushing the trona ore;
- b) introducing crushed trona in a calcining device;
- c) calcining the crushed trona in the calcining device;
- d) collecting the calcined trona from the calcining device;
- and
- e) collecting the gas generated by the trona ore calcination from the calcining device in order to constitute the produced gas;
- wherein said calcining device comprises a rotary drum with indirect heating.
The process according to claim 22 wherein the amount of air introduced in the calcining device is further limited so that the produced gas has a carbon dioxide concentration of more than 40 volume percents expressed on dry gas, and a quantity of volatile organic compounds of less than 550 mg per kilogram of generated carbon dioxide.
The process according to claim 20, additionally comprising the steps of:
- f) removing part of solid particles of the gas collected from step e);
- g) removing part of the water vapor of the gas collected from step e) or f);
- and
- h) optionally further processing the gas extracted from step g) with one or several steps selected from the group consisting of purification, concentration, carbon dioxide liquefaction, and combinations thereof.
(canceled)
Dependencies are inferred from the claim text.