In a method of recovering a transition metal, a first raw material containing an oxidized transition metal and a second raw material containing a reduced transition metal are prepared. A leached liquid containing at least one of nickel, cobalt and manganese is obtained from a raw material mixture of the first raw material and the second raw material. At least one of nickel, cobalt and manganese is obtained from the leached liquid.

In a method of recovering a transition metal, a first raw material containing an oxidized transition metal and a second raw material containing a reduced transition metal are prepared. A leached liquid containing at least one of nickel, cobalt and manganese is obtained from a raw material mixture of the first raw material and the second raw material. At least one of nickel, cobalt and manganese is obtained from the leached liquid.

To provide means for reducing reaction interference observed when AT III is subjected to limulus test, whereby the limulus test of antithrombin III can be carried out at high accuracy. Reaction interference observed when AT III is subjected to limulus test can be reduced by subjecting AT III to a protein inactivation treatment in the co-presence of a divalent metal salt.

To provide means for reducing reaction interference observed when AT III is subjected to limulus test, whereby the limulus test of antithrombin III can be carried out at high accuracy. Reaction interference observed when AT III is subjected to limulus test can be reduced by subjecting AT III to a protein inactivation treatment in the co-presence of a divalent metal salt.

A method for producing manganese(II) sulfate monohydrate includes a pulverization and washing step of pulverizing and washing a manganese-containing by-product, a leaching step of leaching the pulverized manganese-containing by-product after the pulverization and washing step to produce a leachate, a neutralization step of neutralizing the leachate produced in the leaching step, an impurity removal step of removing impurities from the leachate neutralized in the neutralization step, a solvent extraction step of recovering manganese in the form of an aqueous solution of manganese sulfate from a process liquid subjected to the impurity removal step by using a solvent extraction method, and a crystallization step of producing manganese(II) sulfate monohydrate by evaporating and concentrating the aqueous solution of manganese sulfate produced in the solvent extraction step.

A method for producing manganese(II) sulfate monohydrate includes a pulverization and washing step of pulverizing and washing a manganese-containing by-product, a leaching step of leaching the pulverized manganese-containing by-product after the pulverization and washing step to produce a leachate, a neutralization step of neutralizing the leachate produced in the leaching step, an impurity removal step of removing impurities from the leachate neutralized in the neutralization step, a solvent extraction step of recovering manganese in the form of an aqueous solution of manganese sulfate from a process liquid subjected to the impurity removal step by using a solvent extraction method, and a crystallization step of producing manganese(II) sulfate monohydrate by evaporating and concentrating the aqueous solution of manganese sulfate produced in the solvent extraction step.

Provided is a method for preparing a soft magnetic manganese-zinc ferrite composite by removing impurities from industrial waste step by step. Manganese-containing waste residue is crushed and dried, and then mixed with a flux in a muffle furnace and roasted at a temperature below 1000? C. till solid-liquid stratification; then, multi-step impurity removal is performed to obtain a high-purity quaternary purification solution of manganese sulfate. Similarly, zinc residue is melted to remove impurities, and then multi-step impurity removal is performed to obtain a high-purity quaternary purification solution of zinc sulfate. According to a manganese-zinc-iron ratio required for the manganese-zinc ferrite, the two purification solutions are mixed, and ferrous sulfate is added. The mixed purification solution is coprecipitated with ammonium bicarbonate, washing is performed, and co-precipitated powder is decomposed into ferric oxide, manganese tetroxide and zinc oxide which are then roasted to obtain the manganese-zinc ferrite composite.

Provided is a method for preparing a soft magnetic manganese-zinc ferrite composite by removing impurities from industrial waste step by step. Manganese-containing waste residue is crushed and dried, and then mixed with a flux in a muffle furnace and roasted at a temperature below 1000? C. till solid-liquid stratification; then, multi-step impurity removal is performed to obtain a high-purity quaternary purification solution of manganese sulfate. Similarly, zinc residue is melted to remove impurities, and then multi-step impurity removal is performed to obtain a high-purity quaternary purification solution of zinc sulfate. According to a manganese-zinc-iron ratio required for the manganese-zinc ferrite, the two purification solutions are mixed, and ferrous sulfate is added. The mixed purification solution is coprecipitated with ammonium bicarbonate, washing is performed, and co-precipitated powder is decomposed into ferric oxide, manganese tetroxide and zinc oxide which are then roasted to obtain the manganese-zinc ferrite composite.

A process for generating a metal sulfate that involves crystallizing a metal sulfate from an aqueous solution to form a crystallized metal sulfate in a mother liquor with uncrystallized metal sulfate remaining in the mother liquor; separating the crystallized metal sulfate from the mother liquor; basifying a portion of the mother liquor to convert the uncrystallized metal sulfate to a basic metal salt; and using the basic metal salt upstream of crystallizing the metal sulfate. So crystallized, the generated metal sulfate may be battery-grade or electroplating-grade.

A process for generating a metal sulfate that involves crystallizing a metal sulfate from an aqueous solution to form a crystallized metal sulfate in a mother liquor with uncrystallized metal sulfate remaining in the mother liquor; separating the crystallized metal sulfate from the mother liquor; basifying a portion of the mother liquor to convert the uncrystallized metal sulfate to a basic metal salt; and using the basic metal salt upstream of crystallizing the metal sulfate. So crystallized, the generated metal sulfate may be battery-grade or electroplating-grade.