There is provided a method for manufacturing a porous material including a calcium carbonate, the method including a digestion carbonation process of causing digestion and carbonation of a porous material including a calcium oxide in a presence of water under a flow of a gas including carbon dioxide.

There is provided a method for manufacturing a porous material including a calcium carbonate, the method including a digestion carbonation process of causing digestion and carbonation of a porous material including a calcium oxide in a presence of water under a flow of a gas including carbon dioxide.

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.

This application provides a lithium-nickel-manganese-containing composite oxide, a preparation method thereof, and a positive electrode plate, secondary battery, and electric apparatus containing the same. The lithium-nickel-manganese-containing composite oxide has a core-shell structure and includes a core and a shell enveloping surface of the core, where the core includes Li.sub.x(Ni.sub.yMn.sub.2-y).sub.1-mM.sub.mO.sub.4. M includes one or more selected from Mg, elements from group IVB to group VIB, elements from group IIIA to group VA, and lanthanide elements, where 0.95x1.10, 0.40y0.60, and 0.001m0.015. The shell includes lithium aluminum phosphate and optionally includes lithium aluminum phosphate and aluminum phosphate.

According to the present invention, provided is a carbonate- and magnesium-substituted hydroxyapatite having a particle size of 5 nm or more and 60 nm or less, wherein a portion of the calcium atoms in the hydroxyapatite are substituted with magnesium atoms and a portion of phosphate groups are substituted with carbonate groups.

According to the present invention, provided is a carbonate- and magnesium-substituted hydroxyapatite having a particle size of 5 nm or more and 60 nm or less, wherein a portion of the calcium atoms in the hydroxyapatite are substituted with magnesium atoms and a portion of phosphate groups are substituted with carbonate groups.

A carbonate apatite prepared from natural bone. The carbonate apatite has a protein content of 2000-8000 parts per million and a surface area of 15 to 70 m.sup.2/g. Also provided is a method for preparing the carbonate apatite from cancellous bone particles.

This application provides a positive electrode active material, a method for preparing a positive electrode active material, a positive electrode plate, a secondary battery, a battery module, a battery pack, and an electric apparatus. The positive electrode active material includes a first positive electrode active material and a second positive electrode active material. The first positive electrode active material includes a compound LiNi.sub.bCo.sub.dMn.sub.eM.sub.fO.sub.2, and the second positive electrode active material includes a core, a first coating layer enveloping the core, and a second coating layer enveloping the first coating layer, where the core includes a compound Li.sub.1+xMn.sub.1yA.sub.yP.sub.1zR.sub.zO.sub.4, the first coating layer includes pyrophosphate M.sub.aP.sub.2O.sub.7 and phosphate X.sub.nPO.sub.4, and the second coating layer includes carbon.

Disclosed herein, among other things, are methods for the mechanochemical synthesis of phosphite salts and organophosphite compounds from phosphates, such as condensed phosphates.

Disclosed herein, among other things, are methods for the mechanochemical synthesis of phosphite salts and organophosphite compounds from phosphates, such as condensed phosphates.