摘要:
Provided is a process for the comprehensive recovery of metal cobalt, ruthenium and aluminum from a waste catalyst Co-Ru/Al 2 O 3 in a Fischer-Tropsch synthesis. First, a waste catalyst is subjected to hydrocarbon removal, and reduction treatment, to effectively separate a cobalt slag in an alkali fusion step, and then the cobalt slag is subjected to the steps of acid leaching, cobalt precipitation with oxalic acid or ammonium oxalate, reduction of cobalt oxalate, dissolution of metal cobalt with nitric acid, etc., to obtain Co(N0 3 ) 2 ·6H 2 O. A ruthenate which is dissolved by steps such as alkali fusion, and leaching with deionized water, is subjected to the steps of reduction with ethanol, dissolution with concentrated hydrochloric acid, distillation under reduced pressure, etc., to obtain a β-RuCl 3 ·xH 2 O product with a high purity. Aluminum hydroxide is prepared from a meta-aluminate solution by CO 2 carbonation, by controlling the parameters such as reaction temperature, flow rate of CO 2 , pH value at the end point of the reaction, etc., and the aluminum hydroxide is calcined to obtain aluminum oxide with a product quality achieving the quality requirements of first-class aluminum oxide in the Chinese national standard. The resulting product has a high yield, wherein cobalt is ≥ 97%, ruthenium is ≥ 95%, and aluminum is ≥ 92%.
摘要:
Composite particles of a metal oxide particle within a crosslinked, cored dendrimer are described. Additionally, methods of making the composite particles and compositions that contain the composite particles are described.
摘要:
Bei der Behandlung von Metalloberflächen in sauren bzw. alkalischen Lösungen entstehen Abfälle, die kostenaufwendig entgiftet und entsorgt werden müssen. Ziel der Erfindung ist es, die Metallsalze aus diesen Lösungen zu einem sekundären Rohstoff zu verarbeiten, ohne dabei Primärrohstoffe einzusetzen. Für den Betreiber ergeben sich hieraus ökonomische Vorteile indem für die Sekundärrohstoffe Erlöse erzielt werden können, und für die Natur ökologische Vorteile da weniger Schadstoffe entsorgt werden müssen.
摘要:
Provided is a process for the comprehensive recovery of metal cobalt, ruthenium and aluminum from a waste catalyst Co-Ru/Al 2 O 3 in a Fischer-Tropsch synthesis. First, a waste catalyst is subjected to hydrocarbon removal, and reduction treatment, to effectively separate a cobalt slag in an alkali fusion step, and then the cobalt slag is subjected to the steps of acid leaching, cobalt precipitation with oxalic acid or ammonium oxalate, reduction of cobalt oxalate, dissolution of metal cobalt with nitric acid, etc., to obtain Co(N0 3 ) 2 ·6H 2 O. A ruthenate which is dissolved by steps such as alkali fusion, and leaching with deionized water, is subjected to the steps of reduction with ethanol, dissolution with concentrated hydrochloric acid, distillation under reduced pressure, etc., to obtain a ²-RuCl 3 ·xH 2 O product with a high purity. Aluminum hydroxide is prepared from a meta-aluminate solution by CO 2 carbonation, by controlling the parameters such as reaction temperature, flow rate of CO 2 , pH value at the end point of the reaction, etc., and the aluminum hydroxide is calcined to obtain aluminum oxide with a product quality achieving the quality requirements of first-class aluminum oxide in the Chinese national standard. The resulting product has a high yield, wherein cobalt is ‰¥ 97%, ruthenium is ‰¥ 95%, and aluminum is ‰¥ 92%.
摘要:
Alumina gel is produced on a continuous basis in a stirred reactor into which is bubbled carbon dioxide to neutralize an aluminate solution feeding into the reactor. Careful control of the process parameters, including pH, residence time, temperature and gas flow rate, as well as the geometry of the reactor and other apparatus parameters, can result in the formation of preselected types of gel. When pseudoboehmite is formed in accordance with the invention, alumina gels can be formed with surface areas as high as 300 to 700 square meters per gram.
摘要:
An apparatus (1) for recovering caustic soda from caustic solutions from a bath which is the result of the pickling/satinizing of substantially metallic articles, in which there is aluminum, by immersion in caustic soda arranged in a containment tank (2), comprising: - means (3) for drawing the bath from the containment tank (2), - at least one decantation tank (4) of the bath, for the at least partial separation of aluminum from the bath and for reducing the aluminum content of the bath, the decantation tank (4) being associated in input with the drawing means (3), - means (6) for introducing a crystalline germ for activation of the precipitation of aluminum-based compounds, the introduction means (6) being associated with the decantation tank (4); and - means for introducing water which are associated with the decantation tank (4).