52results about "Cobalt compounds preparation" patented technology

There are provided processes for treating red mud. For example, the processes can comprise leaching red mud with HCl so as to obtain a leachate comprising ions of a first metal (for example aluminum) and a solid, and separating said solid from said leachate. Several other metals can be extracted from the leachate (Fe, Ni, Co, Mg, rare earth elements, rare metals, etc.). Various other components can be extracted from solid such as TiO2, SiO2 etc.

There are provided processes for treating red mud. For example, the processes can comprise leaching red mud with HCl so as to obtain a leachate comprising ions of a first metal (for example aluminum) and a solid, and separating said solid from said leachate. Several other metals can be extracted from the leachate (Fe, Ni, Co, Mg, rare earth elements, rare metals, etc.). Various other components can be extracted from solid such as TiO2, SiO2 etc.

The present invention provides carbon particles with fine particles deposited thereon and a manufacturing method thereof. The carbon particles with fine particles deposited thereon is characterized in that the surface of carbon particle is loaded with perovskite type composite metal oxide particles. The entire body particle of the perovskite type composite metal oxide particle is provided with noble metal particle. The carbon particles with fine particles deposited thereon can replace the commonly used platinum-loaded carbon particle or metal platinum particle for being used as electrode catalyst of fuel cell, etc. Furthermore the use amount of platinum can be greatly reduced compared with the previous platinum-loaded carbon particle. The structure is that the perovskite type composite metal oxide particle is loaded on the carbon particle. The entire body of perovskite type composite metal oxide particle is provided with noble metal particles and the dimension of minicrystal is 1-20nm. For manufacturing the carbon particles with fine particles deposited thereon, the method comprising the following steps can be adopted: preparing a solution comprising the metal complexion forming the perovskite type composite metal oxide particles and noble metal particles, subsequently repeating the step of impregnating the solution into carbon particles and dried the particles thereby adsorbing complex ions of the metal onto the carbon particles, and then subjecting the resultant particles to heat treatment.

A method for recovering nickel from sulfuric acid aqueous solution, for recovering nickel in an effectively utilizable form as a raw material of nickel industry material, by separating efficiently impurity elements of iron, aluminum, manganese, etc., from the sulfuric acid aqueous solution containing nickel and cobalt, and the impurity elements, iron, aluminum, manganese, etc. The method comprises the following steps: subject the sulfuric acid aqueous solution to oxidation neutralization treatment; then subject the solution to neutralization treatment, and separate and recover mixed hydroxides containing nickel and cobalt; subject the mixed hydroxides to dissolution treatment in a sulfuric acid solution having a concentration of equal to or higher than 50% by mass; subject the concentrated solution to solvent extraction treatment, using a phosphate ester-based acidic extraction agent; add a neutralizing agent to the resultant extraction residual liquid; subject the solution to the neutralization treatment, and separate and recover nickel hydroxide generated.

Provided is a method for producing solutions, by which two solutions, namely a high-purity nickel sulfate solution and a mixed solution of nickel sulfate and cobalt sulfate are able to be obtained at the same time from a sulfuric acid solution containing nickel, cobalt and calcium. A method for producing solutions according to the present invention uses a sulfuric acid solution containing nickel, cobalt and calcium and performs a first step S1 for producing a mixed solution of nickel sulfate and cobalt sulfate from the sulfuric acid solution and a second step S2 for producing a solution of nickel sulfate from the sulfuric acid solution in parallel. In the first step, the sulfuric acid solution is subjected to solvent extraction by an extractant, thereby obtaining a first organic solvent after extraction. In the second step, the sulfuric acid solution is subjected to solvent extraction by means of an extractant.