The present invention relates to a composition containing an anionic surfactant based on an alkali salt of sulfosuccinic acid dialkylester to promote the obtention of an inverse microemulsion which is used as foam control composition in a phosphoric acid production medium. The present invention also discloses a process to produce said composition by stirring the components of such a composition to obtain a microemulsion. The invention also aims at a method for controlling foam during the production of phosphoric acid by wet process, avoiding its formation or decreasing its amount.

A solid electrolyte comprising a compound of the formula A.sub.y(MS.sub.4).sub.z(PS.sub.4).sub.4-zX.sub.3 having an ionic conductivity of from 10.sup.?7 to 10.sup.?4 S/cm at room temperature, and methods of making a solid electrolyte.

A method for mass production of phosphoric acid with a rotary kiln, comprising the following steps: pretreating raw materials a carbonaceous reductant; preparing the pre-treated carbonaceous reductant powder; then evenly mixing the carbonaceous reductant powder and the silica powder to obtain a cladding material; mixing the cores and the cladding material for cladding treatment, drying and solidifying same to obtain composite pellets; sending the composite pellets into a rotary kiln for a reduction reaction; sending the high-temperature slag balls exiting the rotary kiln to a cooling device for comprehensive utilization; introducing the fume containing P.sub.2O.sub.5 and fluorine exiting the kiln into a hydration tower for absorbing phosphorus by hydration, then passing same through a phosphoric acid mist capturing tower and a mist removing and separating tower successively, and the fluorine-containing fume discharged from the mist removing and separating tower entering a subsequent fluorine recovery procedure.

A rotary kiln for reducing phosphate ore in kiln phosphoric acid process, comprising a kiln body, a kiln head box, a kiln tail box and a driving device for driving the rotation of the kiln body, wherein a fuel burner is provided at the kiln head, a feed pipe and an outlet flue connected to an external hydration tower are provided at the kiln tail box, the upper part of the kiln body is provided with no air pipe, the outlet flue is provided in the radius range of the kiln body with the axis of the rotary kiln as a center, and the fume conveying direction in the outlet flue is substantially parallel to the axis direction of the rotary kiln or has an included angle of less than 45 thereto. The rotary kiln can effectively mitigate the phenomenon of ring forming in the kiln tail of the rotary kiln.

Preparing a metal-containing solution or gel includes combining a metal oxide and a liquid comprising a polar organic solvent to yield a mixture, wherein the metal oxide comprises hydrogen-bonded molecular chains, and each molecular chain comprises: a metal from Groups 4-6; at least one oxyanion of a main group element from Groups 15 and 16 bound to the metal through a polar covalent bond, wherein the at least one oxyanion is optionally protonated; and at least one water molecule bound to the metal through a polar covalent bond; and heating the mixture to yield a solution or gel comprising the polar organic solvent and the metal. The solution or gel can be acidic.

A system for extracting uranium from wet-process phosphoric acid (WPA), includes an ion exchange resin or solvent extractor for separating uranium from WPA to produce a loaded uranium solution stream and a uranium depleted WPA stream. An ion exchange resin is positioned to receive the loaded uranium solution stream and bind uranium species thereto. An anion solution stream is positioned to feed a solution comprising anions onto the ion exchange resin to form a loaded uranium eluant stream. The loaded uranium eluant stream may then be treated to provide a uranium containing product.

A method of recovering phosphoric acid from process water includes directing a process water stream having a pH and a first concentration of phosphoric acid and at least one salt into a vessel, contacting the process water stream with a sorption agent in the vessel, the sorption agent adsorbing phosphoric acid from the process water, withdrawing a first effluent including a first concentration of the at least one salt and a second concentration of phosphoric acid from the vessel, and contacting the sorption agent including the phosphoric acid with water, at least a portion of the phosphoric acid desorbing from the ion exchange media into the water to form a second effluent having a third concentration of phosphoric acid.

A method of recovering phosphoric acid from process water includes directing a process water stream having a pH and a first concentration of phosphoric acid and at least one salt into a vessel, contacting the process water stream with a sorption agent in the vessel, the sorption agent adsorbing phosphoric acid from the process water, withdrawing a first effluent including a first concentration of the at least one salt and a second concentration of phosphoric acid from the vessel, and contacting the sorption agent including the phosphoric acid with water, at least a portion of the phosphoric acid desorbing from the ion exchange media into the water to form a second effluent having a third concentration of phosphoric acid.

A process for producing a phosphate containing product from a phosphate source is provided. a reactor is fed with a raw material including phosphate in amounts of at least 5 wt. % P.sub.2O.sub.5, and calcium in amounts of at least 0.7 wt. % CaO. The raw material is digested with a digestion liquor (L) of an aqueous solution of sulphuric acid (H.sub.2SO.sub.4) and a mineral acids (HX), in a ratio (H+(SA)/H+(L) of between 2 and 75%, where H+(SA) and H+(L) are the mole content of H+issued from the sulphuric acid and the digestion liquor (L), respectively. The in amounts such that the molar ratio H+(L)/Ca is between 0.8 and 1.95, wherein Ca is the mole content of calcium. The digested suspension is separated into an aqueous phosphate rich solution and a first solid phase.

A process for producing a phosphate containing product from a phosphate source is provided. a reactor is fed with a raw material including phosphate in amounts of at least 5 wt. % P.sub.2O.sub.5, and calcium in amounts of at least 0.7 wt. % CaO. The raw material is digested with a digestion liquor (L) of an aqueous solution of sulphuric acid (H.sub.2SO.sub.4) and a mineral acids (HX), in a ratio (H+(SA)/H+(L) of between 2 and 75%, where H+(SA) and H+(L) are the mole content of H+issued from the sulphuric acid and the digestion liquor (L), respectively. The in amounts such that the molar ratio H+(L)/Ca is between 0.8 and 1.95, wherein Ca is the mole content of calcium. The digested suspension is separated into an aqueous phosphate rich solution and a first solid phase.