A method for dephosphorizing a manganese alloy by first desiliconizing the alloy to a level below 0.6%, and then dephosphorizing the low silicon alloy with barium carbonate or barium oxide in combination with an oxidizing agent. The lower the silicon content the better the results.

A process is described for the electrolytic oxidation of manganese dioxide to an alkali metal permanganate by carrying out the electrolysis in dilute alkali metal hydroxide solution using a non-sacrificial anode and a cathode comprising an alkali-resistant electrode immersed in concentrated alkali metal hydroxide solution in a porous container. The process is particularly adapted to the regeneration of alkali metal permanganate from manganese dioxide which has been precipitated during use of a p...

A method of preparing a positive electrode active composition for use in an alkaline manganese cell comprising a negative electrode, a negative electrode active material, a positive electrode and a positive electrode composition inclusive of manganese dioxide as a positive electrode active material, an electrically conductive filler and low molecular weight polytetrafluoroethylene, wherein an amount of the low molecular weight polytetrafluoroethylene powder ranges from 0.1% to 0.3% by weight bas...

The invention provides a hydrogen manganese oxide compound. It has manganese cations and oxygen anions arranged in a framework having a hollandite-type structure and defining channels. Cations in the channels are confined to manganse, hydrogen and/or lithium cations. The ionic ratios of lithium:manganese cations and of hydrogen:manganese cations are respectively at most 0.05:1 and at least 0.01:1.00. The invention also provides a method of making said compound; a lithium manganese oxide compound...

The process of this invention for preparing Mn(II) chelate comprises forming the Mn(II) chelate by mixing manganese (II) oxide (insoluble) with an aqueous suspension comprising a molar equivalent or molar excess of the insoluble protonated chelating compound at a temperature of from 20.degree.to 50.degree. C. When the reaction is carried out with a protonated chelating agent in the absence of base, a precipitate of the protonated Mn(II) chelate is formed. A low osmolarity MN(II) chelate solution...

A process is described for the preparation of a manganese complex catalyst having the formula: ##STR1## wherein Mn is manganese in a III or IV oxidation state; X is independently selected from a coordinating or bridging species selected from the group consisting of: H.sub.2 O, O.sub.2.sup.2-, O.sup.2-, OH.sup.-, HO.sub.2.sup.-, SH.sup.-, S.sup.2-, >SO, Cl.sup.-, N.sub.3.sup.-, SCN.sup.-, N.sup.3-, RCOO.sup.-, NH.sub.2.sup.- and NR.sub.3 ; R is a radical selected from the group consisting of H...

The invention provides a novel lithium manganese oxide compound in which oxygen anions, lithium cations and manganese cations are arranged in layers, each layer of lithium cations being sandwiched between two layers of oxygen anions, each layer of manganese cations being sandwiched between two layers of oxygen anions and each layer of oxygen anions being sandwiched between a layer of lithium cations and a layer of manganese cations. The invention also provides a method of making the compound; an...

A method of manufacturing manganese dioxide containing 0.05 to 2.0 parts by weight of phosphorus which consists of introducing a manganese sulfate solution and sulfuric acid as an electrolyte into an electrolytic cell, adding to said electrolyte at least one member selected from the group consisting of phosphoric acid, phosphorous acid, hypophosphorous acid and compounds thereof and carrying out the electrolysis at a bath temperature of 92.degree. to 100.degree. C. whereby manganese dioxide cont...

Manganese is recovered from its oxides by reacting a manganese oxide with fused calcium chloride or fused magnesium chloride to provide a liquid phase containing manganese chloride and fused chloride, and a solid phase containing reaction residue, the temperature of the reaction being above the melting point of the calcium or magnesium chloride but below the boiling point of manganese chloride in the reaction mixture. The liquid phase containing the manganese chloride is then subjected to electr...

A manganese-zinc base ferrite containing iron oxide, manganese oxide and zinc oxide as main components in amounts calculated as Fe.sub.2 O.sub.3, MnO and ZnO, respectively, and 0.0003 to 0.003% by weight calculated as P of phosphorus as an auxiliary component, and having a mean grain size from more than 50 .mu.m to 200 .mu.m.