52results about How to "Reduce the amount of decomposition" patented technology

The invention provides a new method for leaching gold by thiosulfate through cobalt and ammonia catalysis. The cobalt and ammonia catalysis is adopted to replace traditional copper and ammonia catalysis, that is, cobalt sulfate is added in thiosulfate gold leaching pulp to replace the adding of copper sulfate. As the thiosulfate method has such advantages as gold leaching in an alkaline medium, no poison of a leaching agent and low cost, the thiosulfate method is extensively considered as a most growable non-cyaniding gold leaching method. However, a traditional thiosulfate gold leaching method has the problem of high leaching agent consumption, and badly hinders the industrial application. The method eliminates the oxygenolysis effect of Cu(NH3)4<2+> on S2O3<2->, can prominently reduce the consumption of thiosulfate, and has equivalent gold leaching rate compared with the copper and ammonia catalysis. The method is helpful to promote industrial application of gold leaching by the thiosulfate method.

The invention discloses a method for preparing a foamed aluminum alloy special-shaped piece with a uniform pore structure, which comprises the following steps: the first step: heating the aluminum alloy to melt, adding titanium hydride, stirring to disperse the titanium hydride, and then adding calcium to aluminum In the molten alloy, stir to increase the viscosity of the melt, cool the stirred melt to obtain a preform; the second step: put the above preform into the mold, heat it up, and keep it warm at this temperature, The primary foamed aluminum alloy prefabricated part is made into secondary foam in the mould, and the foamed aluminum alloy is cooled to obtain a foamed aluminum alloy product. In the second step, before the secondary foaming is heated up, the primary foamed aluminum alloy prefabricated part and the mold are preheated and kept warm. In the present invention, titanium hydride is added before the tackifier calcium is added, and the viscosity of the aluminum alloy melt is low, which is conducive to the uniform dispersion of titanium hydride in the aluminum alloy melt in a relatively short period of time, and is conducive to the preparation of a uniform pore structure. Dimensional foam aluminum alloy profiled parts.

The invention discloses a method for improving the oxidation yield of the hydrogenated liquid of hydrogen peroxide prepared by utilizing an ananthraquinone process. In the oxidation process, an acid solution entering an oxidation tower is prepared by completely or partially replacing phosphoric acid with organic acid. A composite acid solution comprises the following components by mass: 2% to 30% of the organic acid, 0% to 40% of the phosphoric acid and the balance of water. The composite acid solution is mixed with the hydrogenated liquid at a volume ratio of 1:(2-10)*10<4>. According to the method, the oxidation yield of the hydrogenated liquid can be improved by more than 4%; the discharge quantity of a residual oxidation liquid is reduced by more than 4%; and the stability of H2O2 (hydrogen peroxide) in the residual oxidation liquid is improved from 43% to more than 82%. As a result, based on the improvement in the stability of the residual oxidation liquid and the reduction in the discharge of the residual oxidation liquid, the safety of oxidation equipment is enhanced.

The invention discloses a continuous sampling apparatus and a continuous sampling method for a marine natural gas hydrate. The continuous sampling apparatus comprises refrigeration equipment, a single-action rotation sampling drilling tool, a high-pressure plunger pump, air compression equipment, nitrogen production equipment, a thermal insulation and pressure retention separation device and a thermal insulation and pressure retention ore box, wherein the refrigeration equipment, the single-action rotation sampling drilling tool, the high-pressure plunger pump, the air compression equipment, the nitrogen production equipment, the thermal insulation and pressure retention separation device and the thermal insulation and pressure retention ore box are connected through pipelines, and are sequentially fixed on an exploration ship, and the single-action rotation sampling drilling tool contacts a marine natural gas hydrate stratum. According to the present invention, the high-pressure low-temperature jet flow is used as the cutting tool to drill into the stratum, the broken hydrate blocks are transported to the sea surface thermal insulation and pressure retention bin through the hydraulic lifting mode, the continuous core sampling can be achieved according to the self-protection effect, the hydrate decomposition caused by the frictional heat generation of the drilling bit can be effectively reduced, and the anti-circulation channel can be in the low temperature environment.

The invention provides a device for bleaching a nitric acid solution through a urea method and a preparation method therefor. The device comprises an acid preparation tank and a urea storage tank, wherein the acid preparation tank is connected with the urea storage tank through a communicating pipe; the top end of the acid preparation tank is connected with one inlet end of an ejector through a nitrogen dioxide pipe, the other inlet end of the ejector is connected with the urea storage tank, and the outlet end of the ejector is connected with a liquid distributor horizontally arranged inside the acid preparation tank through a urea pipe; and the outlet of the urea storage tank is connected with the urea pipe and the ejector respectively through a circulating conveying pump. Under micro negative pressure, NO2 in nitric acid and a urea solution both enter the ejector for reaction, and enter the acid preparation tank together with the urea solution to react with carbon dioxide generated later. Long-acting colorlessness of the nitric acid solution can be realized for a long time, so that the content of carbon dioxide in the acid preparation tank is quickly controlled, and the content overstandard problem of nitrogen dioxide is solved.

The invention discloses a preparation method of silver-coated copper powder, and relates to the technical field of advanced electronic materials. The preparation method of a silver-coated copper powder provided by the present invention uses the silver ion complexing agent in the replacement chemical treatment solution to complex the silver ion to reduce the concentration of silver ions on the surface of the copper powder, and at the same time, the copper ion complexing agent makes it easier for the copper ion to discharge uniformly , promote the uniform deposition of silver atoms on the surface of copper powder, and the silver ion complexing agent and copper ion complexing agent produce a synergistic effect, thereby improving the complexation efficiency of silver ions and copper ions on the surface of copper powder, and further improving the deposition of silver atoms on the surface of copper powder. The deposition rate of the silver-coated copper powder can be quickly formed and evenly covered on the surface of the copper powder. Surface silver effect and technical effect of silver quality.

The invention discloses a method and system for continuous production of nitrosyl sulfuric acid. The method for continuous production of nitrosyl sulfuric acid comprises the following steps: sulfuric acid, water and nitric acid are continuously pumped into an acid mixing tank to obtain mixed acid, mixed acid And liquid sulfur dioxide is continuously pumped into the high gravity reactor for reaction, and finally the nitrosyl sulfuric acid product is obtained. The present invention can accurately control the amount of materials, enhance the mass transfer effect, shorten the reaction time, shorten the average residence time of materials in the reaction cycle system, reduce the loss of raw materials, reduce production costs, and the system does not produce tail gas, green Environmental friendly.