Abrégé

A method for the recovery of silica from magnesium silicate by digestion with hydrochloric acid followed by physical and chemical purification. The magnesium silicate is selected as a serpentinic mineral or waste resulting from treatments of a magnesium silicate.

Classes IPC  ?

• C01B 33/12 - SiliceSes hydrates, p. ex. acide silicique lépidoïque
• C01B 33/187 - Préparation de silice finement divisée ni sous forme de sol ni sous forme de gelPost-traitement de cette silice par traitement acide de silicates

Abrégé

A process comprising producing potassium hydrogen sulfate from KCI using reactors in cascade, using an excess of sulfuric acid, in a continuous process; precipitation of potassium sulfate (SOP) under controlled temperature, ratio of wet methanol to potassium acid sulfate and reaction time; production of magnesium sulfate by reacting acid recovered from the production of potassium acid sulfate with calcined tailings, in wet methanol, thereby eliminating acid prior to recovery of methanol by distillation, allowing recovery of potassium values of entities unreacted previously, in absence of cavitation, while recycling magnesium chloride obtained by crystallization of magnesium sulfate to the production of potassium acid sulfate and recovering of potassium values from unreacted KCI and potassium acid sulfate, in a filtrate of the potassium sulfate (SOP), thereby allowing an alternate direct access to sulfate of potassium and magnesium (SOPM) by reacting potassium acid sulfate with calcined tailings and sulfuric acid.

Classes IPC  ?

• C05D 11/00 - Mélanges d'engrais couverts par plus d'un des groupes principaux
• C05D 1/00 - Engrais potassiques
• C05D 5/00 - Engrais magnésiens

Abrégé

A method for producing a double sulfate of potassium and magnesium by dry mechanical attrition of potassium sulfate and magnesium sulfate hexahydrate, comprising obtaining potassium sulfate by sulfatation of potash to bisulfate of potassium and disproportionation of the bisulfate of potassium to potassium sulfate in a water-methanol solution, and obtaining magnesium sulfate hexahydrate by sonic-assisted partial sulfatation of calcined serpentinic silicate.

Classes IPC  ?

• C05D 1/02 - Fabrication à partir du chlorure ou du sulfate de potassium ou de sels doubles ou de mélanges de ces sels
• C01D 5/02 - Préparation de sulfates à partir de sels de métaux alcalins et d'acide sulfurique ou de bisulfatesPréparation de bisulfates
• C01D 5/12 - Préparation de sulfates doubles de magnésium et de sodium ou de potassium
• C01F 5/40 - Sulfates de magnésium

Abrégé

A method for producing a double sulfate of potassium and magnesium by dry mechanical attrition of potassium sulfate and magnesium sulfate hexahydrate, comprising obtaining potassium sulfate by sulfatation of potash to bisulfate of potassium and disproportionation of the bisulfate of potassium to potassium sulfate in a water-methanol solution, and obtaining magnesium sulfate hexahydrate by sonic-assisted partial sulfatation of calcined serpentinic silicate.

Classes IPC  ?

• C05D 11/00 - Mélanges d'engrais couverts par plus d'un des groupes principaux
• C01D 5/12 - Préparation de sulfates doubles de magnésium et de sodium ou de potassium
• C05D 1/00 - Engrais potassiques
• C05D 5/00 - Engrais magnésiens

Abrégé

A method for producing potassium-based fertilisers, comprising using potassium acid sulfate as the potassium source, and using sonication in reactions with magnesium silicate or apatite at low temperature, with near quantitative yield, to yield in times of the order of minutes the corresponding potassium magnesium sulfate or potassium di-hydrogen phosphate respectively.

Classes IPC  ?

• C05D 1/00 - Engrais potassiques
• C01B 25/30 - Phosphates alcalins
• C01B 25/45 - Phosphates contenant plusieurs métaux ou un métal et l'ammonium
• C01D 5/02 - Préparation de sulfates à partir de sels de métaux alcalins et d'acide sulfurique ou de bisulfatesPréparation de bisulfates
• C01D 5/12 - Préparation de sulfates doubles de magnésium et de sodium ou de potassium
• C05B 7/00 - Engrais à base essentielle d'orthophosphates alcalins ou d'ammonium
• C05D 1/02 - Fabrication à partir du chlorure ou du sulfate de potassium ou de sels doubles ou de mélanges de ces sels

Abrégé

A method and a system for the production of potassium sulfate. The method comprises reacting a chloride of potassium with a magnesium sulfate in an aqueous alcoholic solution, with recycling of magnesium sulfate and production of hydrochloric acid, where the recycling of magnesium is done by a reaction of sulfuric acid on resulting magnesium chloride with corresponding production of magnesium sulfate and hydrochloric acid.

Classes IPC  ?

• C01D 5/10 - Préparation de sulfates par double décomposition avec des sulfates de magnésium, de calcium, de strontium ou de baryum
• B01J 19/00 - Procédés chimiques, physiques ou physico-chimiques en généralAppareils appropriés