Matches 101 - 150 out of 240 < 1 2 3 4 5 >
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4654131 Recovery of tungsten valves from alkaline solutions  
A method of removing sodium ions from an alkaline aqueous solution such as a leach solution which contains dissolved sodium tungstate. The method involves passing the solutions through the anode...
4634579 Selective removal of arsenical material in the course of an alkaline process for treating a uraniferous and/or molybdeniferous ore by means of a magnesium compound  
A process for the selective removal of arsenical material in the course of a process for the hot oxidizing attack on a uraniferous and/or molybdeniferous ore containing arsenical materials,...
4634585 Heteropoly acid containing carbon as hetero atom  
The present invention relates to a heteropoly acid containing carbon as a hetero atom. This heteropoly acid is useful as catalysts or starting materials for various reactions, color forming...
4619744 Recovery of heavy metals from aqueous solutions  
Process for the recovery of heavy metals from aqueous solution by reaction with soluble, functionally-substituted polymer upon which the heavy metal loads, and optionally crosslinks by interaction...
4608084 Recovery of cobalt and chromium  
A process is disclosed for recovering cobalt and chromium from a cobalt and chromium containing alloy. The process involves first digesting the alloy in concentrated hydrochloric acid at a...
4605538 Production of pure molybdenum  
A process is disclosed for producing pure molybdenum which involves contacting a molybdate solution with a true liquid alkaloid in an amount sufficient to form an alkaloid-molybdenum compound with...
4603004 Latent heat storage medium, method of manufacturing a nucleating agent and latent heat storage device  
The precipitation product of sodium tungstate dihydrate from a melt of sodium acetate-trihydrate is a nucleating agent for latent heat storage medium on the basis of sodium acetate-trihydrate,...
4599223 Separation of tungsten from rhenium  
A process is disclosed for separating tungsten from a solution containing tungstate and perrhenate ions. The process involves reacting a sufficient amount of hydrochloric acid with the solution at...
4599224 Recovery of molybdenum from molybdenum disulfide  
A process is disclosed for recovering molybdenum from molybdenum disulfide. The process involves forming a slurry of the molybdenum disulfide in a solution of an alkali metal hydroxide, the amount...
4594230 Recovery of cobalt  
A process is disclosed for recovering cobalt in a relatively pure form from an impure cobalt bearing material. The process involves digesting the material in hydrochloric acid to form a solution...
4584184 Separation and recovery of molybdenum values from uranium process waste  
A method for treating process waste consisting of uranium hexafluoride, UF 6 , molybdenum hexafluoride, MoF 6 and molybdenum oxytetrafluoride, MoOF 4 is provided wherein the foregoing mixture is...
4578251 Removal of chromium from cobalt  
A process is disclosed for removing chromium from cobalt. The process involves first contacting an acidic cobalt chloride solution with an oxidizing agent, followed by adjusting the pH to from...
4569830 Method and plant to recover chromium salts from tannery reflux water  
The present invention refers to a method to recover trivalent chromium salts from reflux water originating from a hide tanning process, via the so-called "chromium" system, including the following...
4560546 Chromium hydroxide precipitate obtained by a continuous process for the removal of chromium from waste waters  
A chromium hydroxide precipitate obtained by a continuous process is described, wherein chromium containing waste waters are subjected to continuous hot treatment with acetic acid or with alkaline...
4552729 Method for removing tin from sodium tungstate solution  
A method is disclosed for removing tin from aqueous sodium tungstate solutions. The method involves adding ammonia to the sodium tungstate solution, adjusting the pH to above about 9.5 with an...
4551328 Selectively absorbent layer for solar collectors, and method of making it  
A selectively absorbent layer for solar collectors, comprising a mixture of chromium oxides resulting from thermal decomposition of chromium hexacarbonyl or substituted chromium carbonyl. The...
4533527 Tungsten recovery from carbides  
Tungsten can be extracted into solution from tungsten carbide powder residues with aqueous hydrogen peroxide to a greater extent by employing in solution a catalytic quantity of hydrochloric acid,...
4532111 Recovery of catalysts as W, Mo or Ru oxychlorides in liquid phase chlorination of pyiridine compounds  
Metal chloride catalysts employed in liquid phase chlorination reactions are recovered by treating the reaction mass with oxygen or air to form solid metal oxychloride compounds which can be...
4512958 Method of recovering molybdenum oxide  
A method of recovering molybdenum oxide as in U.S. Pat. No. 4,379,127 wherein, however, the temperature in the autoclave and the pressure therein are controlled within narrow ranges by increasing...
4511541 Process for the recovery of cadmium and other metals from solution  
A process for the selective recovery of cadmium, molybdenum, zinc, nickel and other metal values from wet process phosphoric acid and other acidic to slightly basic carrier solutions, wherein the...
4500495 Recovering metals from spent hydroprocessing catalysts  
A process for recovering the metal values from spent hydroprocessing catalyst particles. The metal values will include at least one metal of Group VIII of the Periodic Table and at least one metal...
4500496 Process for purifying molybdenite concentrates  
An improved process is disclosed for the treatment of molybdenite concentrate to remove impurities, such as copper and lead therefrom. According to this process, ferrous chloride liquor is...
4495159 Extraction of arsenic in solution in liquors containing alkali metal carbonate, sulphate and possibly hydroxide, and at least one of the metals vanadium, uranium and molybdenum  
A process for extracting arsenic from aqueous solution to be purified, in accordance with claim 1 of U.S. Pat. No. 2,404,601, which also contains alkali metal carbonate, sulphate, hydroxide or...
4495157 Recovery of metal values from spent hydrodesulfurization catalysts  
A process is provided for recovering metal values from spent hydrodesulfurization catalyst, the process comprising forming in a pressure reactor an aqueous slurry of finely divided spent catalyst...
4490339 Process for recovering tungsten from MoS.sub.3 /WS.sub.3 precipitates  
A process is provided for recovering molybdenum and tungsten separately from a sulfide cake containing the same along with arsenic as an impurity. The process comprises dissolving essentially all...
4485074 Process for the recovery of molybdenum from organic solutions  
Process for the recovery of molybdenum from an organic solution, such as a spent catalyst solution obtained from the molybdenum catalyzed epoxidation of an olefinically unsaturated organic compound...
4485075 Process for the extraction of arsenic from aqueous solutions containing alkali metal carbonate, sulfate and hydroxide or hydrogen carbonate and at least on metal including vanadium, uranium and molybdenum  
A process for extracting arsenic from aqueous solutions containing alkali metal carbonate, sulfate and hydroxide or hydrogen carbonate, at least one metal selected from the group consisting of...
4483829 Process for recovering proteins and chromium from chrome-tanning waste  
Waste products from the chrome-tanning of hides are washed and then chopped in water, with subsequent hydrolyzation at a pH of at least 10.5 and at boiling or near-boiling temperature. The...
4481087 Process for removing chromate from solution  
A process for removing dissolved chromium from a solution wherein said chromium is in the anion form which comprises contacting said solution with an adsorbent, comprising a hydrous oxide of iron...
4454098 Process for reclaiming tungsten from a hazardous waste  
A process is disclosed wherein tungsten is recovered from hazardous waste material containing said tungsten, arsenic, and other impurities which can consist of magnesium, phosphorus, and silicon...
4452762 Hydrometallurgical process for the recovery of valuable metals from metallic alloys  
A process for the recovery of valuable metals from metallic alloys having iron as their principal constituent is disclosed in which the metal is leached by means of a sulfuric acid solution having...
4451439 Process for the purification of solutions containing a sodium or potassium carbonate, sulphate, and possibly hydroxide, and at least one of the metals vanadium, uranium and molybdenum  
A process for the purification of solutions containing sodium or potassium carbonate, sulphate, hydroxide or hydrogen carbonate, and mainly at least one of the metals belonging to the group formed...
4442073 Separation and recovery of metal alloys from superalloy scrap  
A method for recovering superalloy scrap is disclosed. The method involves oxidizing superalloy scrap in an aqueous acidic medium. The aqueous acidic medium has an oxidation potential sufficient to...
4432953 Leaching cobalt from spent hydroprocessing catalysts with sulfur dioxide  
A process for enhancing recovery of cobalt from spent hydroprocessing catalysts when the spent catalyst particles are first roasted at between 400° C. and 600° C. and then contacted with a first...
4432947 Process for obtaining molybdenum as a useful product from molybdeniferous solutions containing alkali metal carbonate, sulphate, hydroxide or hydrogen carbonate and possibly uranium  
A process for obtaining molybdenum as a useful product from aqueous solutions to be purified, according to claim 1 of French patent No. 2 404 601, which contain, besides said molybdenum, alkali...
4423013 Process for the purification of solutions containing alkali metal carbonate, sulphate, hydroxide or possibly hydrogen carbonate, and one at least of the metals vanadium, uranium and molybdenum  
Process for extracting molybdenum from aqueous solutions containing alkali metal carbonate, sulphate, hydroxide or hydrogen carbonate and, primarily, one at least of the metals belonging to the...
4423009 Carbonate, sulphate and hydroxide or hydrogen carbonate  
Process for the purification of an aqueous solution containing alkali metal carbonate, sulphate, and hydroxide or hydrogen carbonate and primarily one at least of the metals belonging to the group...
4410497 Separation of uranium from carbonate containing solutions thereof by direct precipitation  
A direct precipitation method based on the insolubility of uranyl phosphate in carbonate containing solutions at pH 6-6.5 and its insolubility at pH 8 is described. The method eliminates the use of...
4405566 Removal of uranium from sulphate solutions containing molybdenum  
A process for recovering uranium values from a sulphate solution containing dissolved uranium and molybdenum and with a pH not exceeding about 5.5, includes reacting the solution with ammonia at a...
4405572 Recovery of molybdenum  
Molybdenum catalyst employed in the epoxidation of an olefin with an organic hydroperoxide preferably the epoxidation of propylene, is recovered from the bottoms fraction by adding aqueous alkaline...
4401573 Continuous process for the removal of chromium from waste waters and valorization of the recovered chromium  
A continuous process is described, wherein chromium-containing waste waters are subjected to continuous hot treatment with acetic acid or with alkaline acetates and alkaline hydroxides at a...
4393029 Process for the production of an iron-free chronium (III) compound  
An iron-free chromium(III) compound is precipitated at an elevated temperature and pressure from an acidic aqueous solution which contains iron and chromium. In order to prevent coprecipitation of...
4367213 Use of selected catalyzed hydrazine compositions to reduce hexavalent chromium [Cr(VI)]  
Disclosed is a process for reducing hexavalent chromium [Cr(VI)] in aqueous solutions to trivalent chromium [Cr(III)] by reacting a catalyzed hydrazine composition with the hexavalent chromium at a...
4349423 Process for decomposing hard metal scrap  
The process is principally based upon an electrochemical technique due to which the binding material for tungsten and cobalt is dissolved and from the solution under certain conditions cobalt or...
4348231 Method of recovering metal carbides  
Selected portions of metal carbide are recovered from scrap material containing pieces of cemented metal carbide having various compositions of metal carbide distributed in a matrix material. The...
4338200 Process for the removal of heavy metals from aqueous liquids  
The invention relates to a process for the removal of heavy metal ions, particularly chromium, lead and/or zinc ions, from aqueous liquids by precipitation wherein the aqueous liquid containing the...
4337227 Recovery of chromium from waste solutions  
Chromium is selectively precipitated from waste solutions by means of benzoate ion. The resulting chromium benzoate complex is separated, washed and treated with either base or sulfuric acid to...
4320094 Partitioning of refractory metals from oxidation resistant scrap alloy  
Alloy scrap containing refractory metals such as chromium, molybdenum, tungsten, vanadium, niobium and tantalum and base metals such as nickel, cobalt, copper and iron are treated to partition the...
4317802 Process for separating molybdenum and/or other metals contained in residual organic effluents  
The process relates to the separation of the molybdenum and/or tungsten, titanium, vanadium, niobium or tantalum present in the form of organometallic compounds in residual effluents. It is...
4317801 Recovery of molybdenum from spent catalyst solutions from hydroperoxide epoxidations  
In the process of recovering molybdenum from a spent catalyst solution obtained from a crude reaction product of a molybdenum catalyzed epoxidation of an olefin with an organic hydroperoxide from...
Matches 101 - 150 out of 240 < 1 2 3 4 5 >