170 results about "Thiosulfates" patented technology

The invention provides a passivator for repairing mercury polluted soil. The passivator is prepared from a sulfur-containing reagent and an iron-containing reagent which are stored separately in a mass ratio of 1:5-5:1, wherein the sulfur-containing reagent is one or more of sulfur, sulfide, hydrosulfide, polysulfide and thiosulfate, and the iron-containing reagent is one or more of zero-valent iron, ferrous sulfate and hydrate thereof, ammonium ferrous sulfate and hydrate thereof, ferric sulfate, ferrous chloride and hydrate thereof, ferric chloride and hydrate thereof, polyferric chloride, poly ferrous sulfate, ferroferric oxide and ferric oxide. The sulfur-containing reagent and the iron-containing reagent in the passivator for repairing mercury polluted soil are stored separately, so that invalidation of effective ingredients of mercury in soil caused by reactions generated by mixing can be avoided. The passivator is wide in raw material source and low in cost. The repairing method is simple and feasible, is not sensitive to the soil type, has a remarkable repairing effect for various forms of mercury, does not have secondary pollution, and can be used for repairing cadmium, lead, zinc, copper or nickel heavy metal polluted soil.

An improved phenoxyphosphazene compound is produced by treating a phenoxyphosphazene compound with (a) at least one adsorbent selected from activated carbon, silica gel, activated alumina, activated clay, synthetic zeolite and macromolecular adsorbents, (b) at least one reagent selected from metal hydrides, hydrazine, hypochlorites, thiosulfates, dialkyl sulfuric acids, ortho esters, diazoalkanes, lactones, alkanesultones, epoxy compounds and hydrogen peroxide, or (c) both the adsorbent and reagent, thereby reducing the acid value of said phosphazene compound to lower than 0.025 mgKOH / g.

Processes are provided for recovering precious metals from refractory materials using thiosulfate lixiviants. The processes can employ lixiviants that include at most only small amounts of copper and / or ammonia and operate at a relatively low pH, reduction of polythionates, inert atmospheres to control polythionate production, and electrolytic solutions which provide relatively high rates of precious metal recovery.

A composition is provided comprising three liquids which are separately maintained prior to forming an admixture during delivery to a surface to be treated, whereupon the admixture generates a heated foam sufficient for cleaning efficacy and stability. A first liquid preferably includes a hypohalite, or a hypohalite generating agent, a second liquid preferably includes a peroxygen agent and a third liquid includes a reducing agent, such as a thiosulfate. The first liquid is thickened to a specified rheology, resulting in the generation of a highly effective foam. As the liquids are initially separated, they can be maintained in an environment free of reactants and otherwise conducive to their activity and stability up to the time of use. When the liquids are allowed to mix, for example, by simultaneously pouring into a drain, the hypohalite and peroxygen react to liberate oxygen gas, while the hypohalite and thiosulfate react to generate heat. As foam generation occurs, the escaping gas contacts surfactant in the solution, and creates foam which expands to completely fill the drain pipe. The expanded foam is hot as a consequence of the exothermic reaction, and further contains an excess of the hypohalite, both of which act to clean the drain.

A method for recovering precious metals such as gold and silver from aqueous solution as solid is described The method includes mixing an aqueous solution (e.g, thiosulfate or thiocyanate lixiviant) containing precious metals with ferrous ions in the presence of an effective amount of hydroxide ions. The precious metal ions are reduced and co-precipitate with iron hydroxides and / or hydrated iron oxides The co-precipitate is collected and purified. De-oxygenation of the reaction solution is optional. The recover / method is fast, complete and clean.

A thiosulfate polymer includes both an electron-accepting photosensitizer component and thiosulfate groups in the same molecule, arranged in random order along the backbone. The thiosulfate polymer composition can be formulated into compositions and applied to various articles, or used to form a predetermined polymeric pattern after photothermal reaction to form crosslinked disulfide bonds, removing non-crosslinked polymer, and reaction with a disulfide-reactive material. Such thiosulfate polymer compositions can also be used to sequester metals in nanoparticulate form, and as a way for shaping human hair in hairdressing operations.

The invention provides a thiosulfate gold leaching method and application, and relates to the technical field of hydrometallurgy. The thiosulfate gold leaching method comprises the steps of adding metal salt, a polycarboxylic acid additive and thiosulfate into gold-containing ore pulp for leaching, wherein a large number of acid radical groups distributed on a hydrocarbon chain of the polycarboxylic acid additive and positive ions generated through hydrolysis of the metal salt in a solution can be subjected to a multi-tooth chelation effect to generate complex ions, thereby replacing Cu (NH3)4 < 2 + > in a traditional thiosulfate gold leaching process, and the defect of large thiosulfate consumption due to the fact that Cu (NH3) 4 < 2 + > has oxidability can be overcome on the premise that the high gold leaching rate is obtained. The concentration of harmful ions such as dithionite in decomposition products of S2O3 < 2-> in the leaching solution is remarkably reduced, and recycling ofthe leaching solution and recycling of gold in the solution are facilitated; and meanwhile, the thiosulfate gold leaching method also avoids the problems of safety and environmental influence causedby the use of ammonia water.

The invention discloses a method of preparing sodium sulphide by using microwave induced carbon to reduce sodium thiosulfate, and its characteristic: in mole ratio of sodium thiosulfate to alkali 1 to 2, mixing sodium thiosulfate with excessive carbon for concentrating or spray-drying, using microwave to act on the obtained solid for 2-3 min and completing the reaction, after cooling, adding in water for dissolving, filtering and recovering the fully unreacted carbon, and the filtrate is sodium sulphide solution. It can economically and fast reduce the waste liquids containing sodium thiosulfates into sodium sulphides, and the produced sodium sulphides contain no organic impurities and can meet the requirement of circularly using.