Supercritical hydro extraction of kerogen and aqueous extraction of alumina and soda ash with a residue for portland cement production

摘要

#$%^&*AU2010224338B220110714.pdf#####Supercritical Hydro Extraction of Kerogen and Aqueous Extraction of Alumina and Soda Ash with a Residue for Portland Cement Production 5 Abstract A method and apparatus for the extraction of hydrocarbon products, alumina and soda ash from oil shales including various amounts of such chemicals, all based on solvent extraction of most of the hydrocarbons at temperatures around 400*C. Such enables the alumina and soda ash values to be leached out with aqueous sodium carbonate 10 leaching at reduced temperatures of around 150C with a corresponding reduced pressure. The soda ash monohydrate values are precipitated from the leach liquor at around 100'C with the alumina values precipitated using CO 2. Alternatively recycled fine aluminum trihydrate at 650C is used to produce alumina. Aluminum hydroxide is converted to acid alumina by an acid recycle stream that dissolves the alumina so any silica contaminant 15 can be filtered out. Basic aluminum sulfate is then precipitated at about 200*C and 250 PSIG for subsequent calcination at around 9000C. This produces alumina and sulphate oxide gasses are recycled via a sulphuric-acid plant.