4results about How to "High decomposition activity" patented technology

The invention relates to the technical field of rare earth ore concentrate treatment, in particular to a rare earth ore concentrate treatment method. The treatment method of the rare earth concentrate comprises the following steps that the rare earth concentrate, a calcium-containing compound, silicon dioxide and carbon powder are mixed and roasted, and roasted ore is obtained; water is added into the roasted ore for size mixing, and size is obtained; and acid is added into the slurry for reaction, solid-liquid separation is carried out, and acid leaching residues and rare earth chloride feed liquid are obtained. The method has the advantages of being simple in technological process, high in rare earth recovery rate, short in reaction time, environmentally friendly, low in cost and diversified in rare earth grade applicability. The silicon dioxide can increase the decomposition activity of bastnaesite and monazite in the rare earth ore, rare earth compounds easy to leach can be generated, and therefore the decomposition rate of the rare earth ore concentrate is increased, and calcium can also play a role in fixing fluorine. According to the method, the rare earth decomposition rate is 98% or above, and the rare earth leaching rate is 96% or above.

This invention provides a self-supporting one-dimensional nanorod array composite material, its preparation method, and its application, belonging to the field of clean energy harvesting technology. The preparation method provided by this invention includes the following steps: mixing soluble nickel salt, soluble molybdate, and water, and carrying out a hydrothermal reaction to obtain a NiMo precursor; heat-treating the NiMo precursor and a modifier under a protective atmosphere to obtain the self-supporting one-dimensional nanorod array composite material. Experimental results show that the composite material prepared by the method provided by this invention has excellent electrocatalytic water splitting activity and operational stability, and photo-assisted synthesis further enhances the electrocatalytic water splitting activity of the composite material, making it applicable to solar-driven electrocatalytic water splitting.

The application relates to the field of photocatalytic conversion, and discloses a noble metal-loaded amorphous metal oxide catalytic material and a preparation method and application thereof. The catalytic material comprises a group VIII amorphous metal oxide and ruthenium; the group VIII amorphous metal oxide is at least one selected from amorphous nickel oxide, amorphous cobalt oxide and amorphous iron oxide; and the content of the ruthenium is 0.1-6.5% in mass based on the total amount of the catalytic material in terms of elements. The catalytic material provided by the application simultaneously contains noble metal and amorphous metal oxide, the rich coordination unsaturated structure of which can provide surface reaction active sites and improve reaction efficiency.

The invention relates to the technical field of straw degradation, and discloses a method for efficiently degrading plant straw by using a microbial composite preparation. The method comprises the following steps: adding urea to a sodium hydroxide solution and stirring evenly, adding straw powder, performing ultrasonic treatment at 60-70 DEG C, adding calcium chloride and continuing ultrasonic treatment, reducing the temperature to -30--50 DEG C, keeping the temperature for 10-30 min, heating the temperature to 50-60 DEG C and stirring, reducing the temperature to room temperature, and performing vacuum drying to obtain pre-treated straw powder A; adding the pre-treated straw powder A to a dilute sulfuric acid solution, stirring at 40-60 DEG C, cooling to room temperature, and freeze drying to obtain pre-treated straw powder B; adding lanthanum chloride to water, stirring at 40-60 DEG C for 10-20 min, adding ε-polylysine and aspartic acid thereto under stirring, adding a composite enzyme and stirring evenly to obtain a composite enzyme liquid; mixing the pre-treated straw powder B and the composite enzyme liquid evenly, adding the mixture to an acetic acid-sodium acetate buffer solution and mixing evenly, performing enzymolysis for 72-96 h, and performing centrifugation.