6 results about "Chlorauric acid" patented technology

The invention relates to a gold nanocluster with controllable luminescence color and a preparation method and application thereof. The gold nanocluster is formed by combined action of TSA, chloroauric acid and zinc ions. The gold nanocluster prepared by the invention can show different luminous colors after being heated at room temperature and high temperature, and can be used for information encryption; meanwhile, due to the high-temperature-resistant characteristic, the material can also be used as a thermal trigger mark. The preparation method of the gold nanocluster is simple and low in cost; the detection means is simple and rapid and easy to observe; and repeated use can be realized.

A green preparation method of a composite SERS substrate for industrial dye detection, which belongs to the technical field of inorganic nanomaterial preparation. It aims to solve the problems of strong fluorescence, poor biocompatibility, high price, and easy oxidation of noble metal SERS substrates for detecting industrial dyes. Method: First, mix Ti3C2T x Mxene powder with ferric chloride solution to prepare multi-layered Ti3C2T x Mxene; Second, mix multi-layered Ti3C2T x Mxene with chloroauric acid solution to prepare accordion-like Ti3C2T x Mxene, and after dispersion, drop it onto a silicon wafer and let it dry naturally. The present invention prepares a gold nanoparticle-modified Ti3C2T x Mxene composite SERS substrate material for industrial dye detection by a green and simple method, avoiding the use of fluorides and maintaining excellent SERS performance at the same time. The product prepared by the present invention is used as an inorganic nanomaterial.

The application discloses a preparation method of gold powder for thick film conductive paste, and the method comprises the following steps: firstly, dissolving gold blocks in aqua regia, adding ammonium chloride, and evaporating to prepare ammonium chloraurate powder; secondly, mixing the ammonium chloraurate powder with ascorbic acid and ball milling to obtain uniformly mixed gold-containing precursor powder; thirdly, calcining the gold-containing precursor powder at low temperature in air to obtain nanometer gold powder; and fourthly, adding the nanometer gold powder into anhydrous ethanol to prepare nanometer gold suspension, and then performing high-temperature atomization to obtain spherical gold powder. By controlling the ball milling time of the ammonium chloraurate and ascorbic acid, combining with the control of low-temperature calcination parameters and the temperature of high-temperature atomization, the gold powder for thick film conductive paste is finally obtained, the addition and cleaning of a direct liquid-phase reduction gold powder dispersant are avoided, the spherical morphology and high purity of the gold powder are ensured, the gold powder is suitable for thick film conductive use, the preparation method is simple in process, high in product yield, large in output, green in environment protection, and easy for industrial production.

The invention relates to the technical field of rare and noble metal metallurgy, in particular to a method for enriching and recovering gold from copper anode slime, which specifically comprises the following steps: (1) adding a preset amount of concentrated sulfuric acid into the copper anode slime, mixing and curing for a preset time to obtain cured slag, adding water into the cured slag, dissolving copper sulfate in the cured slag into water, and stirring to obtain a concentrated sulfuric acid solution; filtering to separate out copper to obtain a first filter residue; (2) adding a preset amount of hydrochloric acid solution into the first filter residue, heating to a preset temperature, introducing chlorine to control the dissolution potential of the solution, carrying out selective dissolution and liquid preparation treatment on gold in the solution, and filtering to obtain tellurium-rich residue and a chloroauric acid solution; (3) carrying out flotation silver removal pretreatment on the tellurium-rich slag to obtain second filter residues, activating the second filter residues, and filtering to obtain third filter residues and an activating solution; the method has the advantages of being low in reagent cost, simple in technological process, environmentally friendly, easy to industrialize and the like, the gold recovery rate is high, and the gold recovery rate can reach 98% or above.

The invention discloses a preparation method of superfine gold powder for conductive paste, which comprises the following steps: 1, adding chloroauric acid and ferric chloride into deionized water, then adding gelatin, heating, stirring and dissolving to prepare a mixed solution; and 2, the mixed solution is subjected to ultrasonic atomization to obtain nano-scale gold-iron fog drops, then the nano-scale gold-iron fog drops are calcined and decomposed, gold-iron alloy nano-powder is collected through a hydrochloric acid solution and soaked, filtering and drying are conducted, and the superfine gold powder is obtained. Gelatin is added to serve as a dispersing agent, more nano gold-iron fog drops with firmer structures are promoted to be formed, the size of superfine gold powder is guaranteed, the gelatin is used for preventing particle adhesion in the calcination decomposition process, the gold-iron alloy nano powder is spherical and does not agglomerate, the gelatin is free of residues after being decomposed, and then dissolved iron is collected through hydrochloric acid, so that the gold powder is obtained. The preparation method is simple in process, high in yield, large in yield and easy for industrial production, and the superfine gold powder with the large specific surface area is obtained.