99 results about "Metal dissolution" patented technology

The invention relates to a method for potential controlled selection separation of copper refinery ash. The copper refinery ash is screened and then subjected to oxidizing leaching in a sulfuric acid system. An oxidizing agent is added to control the metal ion mixed potential of slurry, copper, arsenic, zinc and other metal are dissolved into a solution, and lead, bismuth and other metal precipitate and enter leaching residues. The metal ion mixed potential and the pH value of a leachate are simultaneously controlled, so that copper sulfide concentrate is produced through precipitation. The metal ion mixed potential and the pH value of copper-removed liquid are simultaneously controlled, so that arsenic sulfide products are produced through precipitation. The metal ion mixed potential and the pH value of arsenic-removed liquid are simultaneously controlled, so that zinc sulfide concentrate is produced through precipitation. Zinc-removed liquid is subjected to wastewater treatment and then discharged after reaching the standard. According to the method, the potential controlled oxidizing leaching and potential controlled sulfide precipitation ways are simultaneously adopted for recovering valuable metal step by step, the selection separation effect, which cannot be achieved by independently using the ways, of the valuable metal in the copper refinery ash is achieved, and the leaching rates of copper, arsenic and zinc are larger than 98.0%.

The invention discloses a combined treatment method for copper smelting soot and polluted acid. The method includes the steps that after the copper smelting soot and the polluted acid are mixed for pulp conditioning, an oxidizing agent is added for controlled-potential oxidization leaching, so that copper, arsenic, zinc and other metal in the copper soot are dissolved to enter leachate, and lead, bismuth and other metal are precipitated to enter a reaching residue; then an oxidizing agent is added into the leachate so that As(III) in the solution can be completely oxidized into As(V); afterwards, sodium sulphide is added, so that the copper in the solution is precipitated in the form of copper sulphide to produce copper concentrate, and a reducing agent is added into the copper-removed solution so that the As(V) in the solution can be completely reduced into As (III); then sodium sulphide is added so that the arsenic in the solution can be precipitated in the form of arsenic sulfide; and finally the arsenic-removed solution is neutralized with alkaline and then is discharged after reaching the standard. By the adoption of the combined treatment method, controlled-potential oxidization leaching, controlled-potential oxidization sulfurization and reduction sulfurization are simultaneously combined to be used for step-by-step separation and recovery of valuable metal in the copper smelting soot and polluted acid, and therefore waste in the system can be recycled, and the purpose of using waste to treat waste is achieved.

The invention relates to a photocatalytic metal dissolution method. The method comprises the steps that a metal-containing material to be dissolved is dispersed into a mixed solution of a cyanide compound and organic chloride, then photocatalyst is added, oxygen-containing gas is introduced or a substance capable of generating oxygen is added, and metal can be dissolved through light irradiation for a certain period of time. Compared with the prior art, the method has the advantages of being mild in process, energy-saving, green, environmentally-friendly, low in costs and convenient to operate, and is suitable for large-scale industrialized metal dissolution treatment.

A method of selectively leaching a metal such as nickel from an ore or ore processing intermediate comprising the metal and cobalt. The ore or ore processing intermediate is contacted with an acidic leach solution comprising an amount of an oxidising agent sufficient to oxidise a major portion of the cobalt to thereby cause it to be stabilised in the solid phase while a major portion of the metal is dissolved for subsequent recovery.

An ultrasonic impact treatment method for remediating metal sensitization including introducing ultrasound compression wave energy through ultrasonic mechanical impulse impacts into an area of sensitized metal in a workpiece. The ultrasound compression wave energy and impulse impacts impart compressive residual stress to the workpiece thereby decreasing tensile stresses in the sensitized metal and modifying the grain structure of the workpiece. These changes to the structure of the workpiece combine to slow the rate of enrichment of alloying elements at grain boundaries within the area of sensitized metal, cause intergranular diffusion of alloying elements in the area of sensitized metal, return a portion of alloying elements in the area of sensitized metal to solution and reduce or eliminate substantially straight intergranular paths through the workpiece.

The invention, which relates to the field of cathode materials for a lithium battery, discloses a method for determining the performance of a cathode material for a lithium ion battery. The method comprises: taking a cathode material of a lithium ion battery and making a battery by using the cathode material; carrying out charging-discharging circulation; after completion of the charging-discharging circulation, measuring a capacity retention ratio; taking out a pole piece of the battery, detecting a metal dissolution substance on the pole piece and thus measuring contents of all metal components in the metal dissolution substance conveniently; and on the basis of the measuring result, carrying out analysis by combining the capacity retention ratio of the battery after charging-dischargingcirculation completion to determine the performance of the cathode material of the lithium ion battery. The method is simple, efficient and accurate; the metal dissolution substance amount after charging-discharging circulation of the battery can be detected accurately; the result error is small and the accuracy is high; and thus the powerful base is provided for determining the performance of the cathode material of the lithium ion battery accurately.

The invention discloses preparation of a ZIF-67 catalyst and application thereof to degradation of antibiotics such as tetracycline. The invention discloses preparation and application of a metal organic framework film for catalytically degrading antibiotics such as tetracycline. The preparation method comprises the following steps: dissolving Co(NO3)2.6H2O in methanol to prepare a Co(NO3)2 solution; dissolving 42-methylimidazole in methanol to prepare a 2-methylimidazole solution; dropwise adding a 2-methylimidazole solution into the Co(NO3)2 solution, performing stirring and standing for aging, centrifugally absorbing supernatant, and performing drying to obtain purple solid powder, wherein the prepared catalyst is difficult to degrade antibiotics, and tetracycline is effectively degraded by hydroxyl radicals generated under the oxidation condition of hydrogen peroxide. The hydroxyl free radicals have strong oxidizing property and can oxidize and degrade tetracycline. Compared with the prior art, the ZIF-67 catalyst prepared by the invention has the advantages of low metal dissolution, good reusability, simple and convenient operation process, wide pH application range and the like when being used for activating hydrogen peroxide, and has a wide application prospect in the field of degradation-resistant antibiotic treatment.

The invention discloses a metal-doped ceramsite catalyst, which is prepared by sintering a metal salt with ozone catalytic effect and a ceramic matrix component, wherein the ceramic matrix component comprises pottery clay, a pore-forming agent, vermiculite and a fluxing agent, the fluxing agent is a composition of calcium carbonate and magnesium carbonate, and the catalyst is large in specific surface area, high in porosity, good in catalytic oxidation effect, low in metal dissolution rate, high in utilization rate and low in secondary pollution. The invention further discloses a preparation method of the metal-doped ceramsite catalyst, wherein the preparation method of the ceramsite core is optimized, the doping mode of active components is improved, the catalyst can load high-content metal salt, the use amount of raw materials is small, the production cost is low, the safety is high, repeatability is achieved, and large-scale production and application can be achieved. The inventionfurther discloses applications of the metal-doped ceramsite catalyst, wherein the catalytic oxidation effect is good, organic pollutants in various kinds of sewage can be effectively removed, the utilization rate is high, secondary pollution is reduced, and follow-up treatment is not needed.