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5266201 Process for the purification of aqueous solutions polluted by nitrate ions  
The invention relates to a process for the purification of aqueous solutions polluted by nitrate ions. This process is characterised in that it consists in precipitating hydrated double or mixed...
4865823 Method for recovering gallium  
A method for recovering gallium, which comprises a capturing step of contacting an aqueous solution containing gallium to a chelating agent containing a water-insoluble substituted quinolinol as...
4260589 Production of alumina from aluminum nitrate solutions  
Aluminum nitrate solutions are subjected to hydrolysis at elevated temperature and pressure, with the pressure being kept relatively low by continual bleeding of reactant gases from the reaction...
4252777 Recovery of aluminum and other metal values from fly ash  
The invention described herein relates to a method for improving the acid leachability of aluminum and other metal values found in fly ash which comprises sintering the fly ash, prior to acid...
4246239 Alumina production by nitric acid extraction of clay  
Alumina values are extracted from clay by the steps of pelletizing into spherical particles, calcining the pellets in a fluidized bed reactor, extracting the clay in about 30-40% nitric acid,...
4094955 Acid process for recovery of alumina from clay  
Alumina monohydrate is produced by leaching calcined clay and subjecting the leach liquor to pressure hydrolysis wherein the vapor and heat resulting from the pressure hydrolysis are directly...
3986866 Method of recovery of metal compounds and metals from nitrate solutions  
A method is provided for recovering metal compounds and metals from ores, concentrates, alloys and other metal containing materials. The material containing said metals is leached in an aqueous...
3804598 PROCESS FOR THE CRYSTALLIZATION OF ALUMINUM NITRATE NONAHYDRATE  
Aluminum nitrate nonahydrate crystals are obtained by crystallization of an impure solution of aluminum nitrate obtained by the nitric acid extraction of an aluminous ore, and which has been...
3545920 PROCESS FOR EXTRACTING ALUMINUM FROM SOLUTIONS  
3497459 PROCESS FOR PRODUCING WATER SOLUBLE BASIC SALTS OF ALUMINUM AND/OR IRON  
3415618 Process for producing high purity aluminum nitrate solutions from low grade aluminous ores of intermediate iron content  
3387921 Process for the selective recovery of alumina from ores  
3383166 Process for producing iron-free aluminum nitrate solutions  
3305320 Purification of aluminum nitrate by alternate melting and crystallization  
3211524 Process for treating ferruginous aluminum-bearing ores  
3168372 Method for the recovery of gallium from alunite  
3145081 Process for concentration and purification of beryllium values  
2847279 Method for obtaining iron-free aluminum compound from clays  
2817578 Purification of alumina and phosphates  
3816590 Title is not available  
3671189 Title is not available  
Matches 1 - 21 out of 21