54 results about "Cadmium carbonate" patented technology

A carbon oxide sensor having high sensitivity capable of reduction of influence of humidity is provided. A detection electrode and a counter electrode are provided on one side of an electrolyte, respectively. The detection electrode contains a metal oxide and a metal carbonate including plural components. The metal carbonate preferably contains a first component of alkali metal carbonate and a second component of at least one element selected from the group consisting of alkali earth metal carbonate, transition metal carbonate, zinc carbonate, cadmium carbonate, indium carbonate, lead carbonate and bismuth carbonate. Specifically, it is preferable to contain the first component including Li2CO3 and the second component including at least one element selected from the group consisting of BaCO3, CaCO3 and SrCO3.

The method includes following steps: the cadmium oxide, cadmium carbonate, alkyl carboxylic acid, oleic acid, selenourea, thiourea are taken as raw material. Under the cover of oleic acid, or TOPO, or lauryl amine, or hexadecyl amine, or octadecyl amine, the alkyl carboxylic acid cadmium or the toluol solution of oleic acid cadmium reacts with aqueous solution of selenourea or thiourea at interface to form semiconductor nano-microparticles. Theses semiconductor nano-microparticles can implement wavelength tunable visible light under ultraviolet lamp.

The invention discloses a nanocrystalline with core-shell structure. The nanocrystalline is of a core-shell structure and takes cadmium sulphide as a core and cadmium carbonate as a peripheral shell.A process for preparing the nanocrystalline is that the mol ratio of water-soluble cadmium acetate and sulfur source Cd / S is x, whichin 1.1<=x<=1.4, and raw materials are placed in a high-pressure autoclave to react under the condition that reaction system is of pH 9 to 13, wherein the concentration of the water-soluble cadmium acetate in the reaction system is 5 to 54.5 mmol / L, and the concentration of the sulfur source is 4.5 to 50 mmol / L. The invention is simple in process, easy in operation and low in price, further, the prepared nanocrytalline which is of cadmium sulphide or cadmium carbonate core-shell structure is prepared and the particle diameter of the nanocrytalline is -5nm. The invention has the advantages of high chemical stability, good fluorescence-emission monochromaticity,relatively narrow peak width at half height and the like in comparison with an existing nude nanocrystalline product, which saves precious placing time for surface finish of the nanocrystalline and improves fluorescent property, thereby enabling the nanocrystalline to be used as biological tissue marks after subsequent treatment such as the surface finish and the like.

The invention discloses a method for recycling and refining nickel and cadmium in solid hazardous wastes. The method disclosed by the invention comprises the following steps: reducing semi-finished products by using a carbon-containing reducing agent, wherein the semi-finished products are nickel carbonate and cadmium carbonate which are generated during a treatment process of hazardous wastes containing heavy metals including nickel and cadmium and contain lots of nickel and cadmium and less magnesium, caecum and iron; then carrying out acid leaching; controlling the condition to ensure that cadmium oxide in the system is dissolved but the metallic nickel is not dissolved so as to realize separation of nickel and cadmium; melting the separated metallic nickel at the temperature of 1600 DEG C to form a nickel ingot product of which the grade is above 99%; putting a Cd<2+> solution obtained through dissolution into a workshop process and precipitating the solution by using sodium carbonate so as to obtain a CdCO3 product of which the purity is higher than 98%. The method disclosed by the invention can be used for greatly reducing energy consumption and environmental pollution and has the advantages of short process and easy control over conditions; substances contained in raw materials need not to be purified specially, a high-purity product can be obtained under the condition that the procedures are reduced; the reducing agent is selected conveniently according to local production conditions and is low in cost.