66 results about "Thiosulfates" patented technology

The invention discloses a method for leaching precious metal through catalytic oxidation of thiosulfate, which comprises the following steps: mixing a copper-containing catalytic system-thiosulfate solution with a precious metal-containing material, and carrying out leaching reaction to obtain a precious metal leachate; wherein a copper-containing catalytic system in the copper-containing catalytic system-thiosulfate solution is a copper-iminodiacetic acid complex. The precious metal is extracted by adopting a copper-iminodiacetic acid catalytic system, the leaching rate of the precious metal and the consumption of thiosulfate can be considered, the leaching effect is remarkably superior to that of an existing copper ammonia system, and industrial application is easy to achieve.

The invention discloses an electrochemical separation and recovery method for multiple metals. The method comprises the following steps: providing an electrolytic bath with a cation exchange membrane; the electrolytic cell is divided into a cathode chamber and an anode chamber by the cation exchange membrane; providing a cathode and an anode; preparing an electrolyte solution; placing a multi-metal-containing thiosulfate leachate, a chlorate and an anode in the anode chamber, and placing the electrolyte solution and a cathode in the cathode chamber; and voltage is applied to the cathode and the anode, and after the reaction is completed, base metal deposited on the cathode and precious metal deposited on the anode are recycled respectively. The electrolysis device provided with the cation exchange membrane is adopted, precious metal complex ions and other metal ions are separated and stored in different electrolysis chambers under the action of an electric field, precious metal is recycled at the anode and other metal is recycled at the cathode by further combining chemical and electrochemical actions, and the separation and purification process of the metal recycling process can be shortened.

The invention discloses an environment-friendly gold leaching agent and an application method thereof. The environment-friendly gold leaching agent is formed by mixing halate, thiosulfate and an enhancer. The application method of the environment-friendly gold leaching agent comprises the following steps that gold ore is crushed and ground, the concentration of ore pulp is adjusted to be 30%-50%, then 0.2 wt%-5 wt% of the gold leaching agent is added, the pH of the ore pulp is adjusted to be 6-12, and stirring leaching is conducted for 8-36 hours at the normal temperature and the normal pressure. The environment-friendly gold leaching agent is formed by mixing common chemical reagents, the method is simple, the gold leaching rate is high, the reagent stability is high, gold leaching can be achieved under the neutral to alkaline condition, and the method is an environment-friendly gold leaching method.

The invention discloses a precious metal leaching agent based on thiosulfate and a precious metal leaching process. The leaching agent contains thiosulfate, a thiourea-based catalyst and an iron-based oxidizing agent, and the molar ratio of the thiosulfate to the thiourea-based catalyst to the iron-based oxidizing agent is (0.05-5): (0.005-1): (0.005-1). According to the leaching agent, on the basis of the synergistic effect of all the components, the dissolution efficiency of precious metal is improved, generation of polysulfate in side reaction is greatly reduced, and follow-up precious metal recovery is facilitated. A leaching process adopting the leaching agent comprises the following steps: exposing precious metal sites of a precious metal-containing material, adding the leaching agent, adjusting the pH value of a leaching system, carrying out a leaching reaction, and carrying out solid-liquid separation after the reaction is finished, so as to obtain a precious metal leachate. According to the technology, by controlling the pH value of the system and the adding amount of the leaching agent, leaching of different grades and types of precious metal-containing materials can be achieved under the normal temperature condition, and tests show that by taking gold ore as an example, the gold recovery rate of the technology can reach 100% at most.

The invention relates to a method for leaching gold by catalyzing thiosulfate through a solid catalyst, and belongs to the technical field of production of precious metal gold through hydrometallurgy. The method comprises the following steps: grinding gold ore, and mixing to obtain gold ore pulp with the concentration of 10-40wt%; the method comprises the following steps: adding molybdenum disulfide solid powder or molybdenum disulfide nano-suspension into gold ore pulp, then adding thiosulfate, adjusting the pH value to 9-12, leaching gold under an illumination condition, filtering to obtain a gold leaching solution, and cleaning molybdenum disulfide obtained by filtering for reutilization; or the container wall is coated with molybdenum disulfide printing ink, gold ore pulp is added, then thiosulfate is added, the pH is adjusted to be 9-12, gold leaching and filtering are conducted under the illumination condition, gold leaching liquid is obtained, and the molybdenum disulfide printing ink coated on the container wall is reused after being cleaned. According to the method, molybdenum disulfide is used as a solid catalyst, and thiosulfate gold leaching can be efficiently catalyzed under conventional conditions. The cleaning device has the characteristics of high cleaning efficiency and high universality.

The invention discloses a thiosulfate-doped low-stress room-temperature flexible perovskite thin film deposition method, and relates to the field of perovskite solar cells, and the method comprises the steps: preparing a perovskite precursor solution; adding iodine as an additive into the perovskite precursor solution to obtain a mixed solution; preparing the mixed solution into a thin film through a spin-coating process, dropwise adding an anti-solvent to the surface of the thin film in the spin-coating process, and standing at normal temperature to form a perovskite thin film; wherein the anti-solvent is a chlorobenzene solution doped with thiosulfate. Controllable heat release is achieved through the oxidation-reduction reaction of thiosulfate and iodine, a traditional thermal annealing process is replaced, precursor solvent volatilization can be promoted, perovskite material crystallization is induced, and the high-quality perovskite thin film can be obtained at the room temperature.

The invention discloses a short-process low-cost continuous and stable gold extraction process adopting a thiosulfate method, and belongs to the field of hydrometallurgy. In a closed reactor, by adjusting the concentration of dissolved O2, thiosulfate and a catalyst to be at a low level, the potential of ore pulp is reduced to a suitable range to leach gold ore, and leaching residues and a leaching pregnant solution are obtained through filtering. And pure nitrogen is introduced into the leaching pregnant solution to completely discharge oxygen in the solution, copper powder is added for replacement, and gold-rich crude copper and a replacement barren solution are obtained through filtering. Crude copper rich in gold is treated through electrolytic refining, pure copper is obtained from a cathode, and gold mud is obtained from an anode. And washing the gold mud with dilute acid to obtain a copper-containing pickling solution and pure gold. After the pH of the copper-containing pickling solution is adjusted, the copper-containing pickling solution and the replacement barren solution supplemented with the leaching agent are combined and used for leaching of fresh ore in the next circulation. The method provided by the invention solves the problems of long technological process, high circulation cost and high environmental protection pressure of a copper ammonia catalysis thiosulfate method, and is suitable for being used in a natural environment.

The invention provides a reverse osmosis reducing agent and a preparation method and application thereof, and belongs to the technical field of reverse osmosis water treatment.The reverse osmosis reducing agent comprises a first reducing agent, a second reducing agent and a solvent; the first reducing agent is thiosulfate, and the second reducing agent is sulfite and / or bisulfite; the mass ratio of the first reducing agent to the second reducing agent is (1: 18)-(10: 1). The reverse osmosis reducing agent can be applied to reverse osmosis water treatment, the reverse osmosis reducing agent is added into reverse osmosis inlet water to be treated, and the reverse osmosis inlet water subjected to reduction treatment can be obtained after full reaction. The first reducing agent and the second reducing agent are compounded according to the specific mass ratio, so that the compounded reverse osmosis reducing agent can effectively inhibit the occurrence of advanced oxidation chain reaction while keeping high reducibility, and effective reduction of reverse osmosis inlet water can be realized by using a small amount of the reverse osmosis reducing agent.

The invention relates to the technical field of materials, and discloses an enhanced nano composite catalyst based on an MOFs material, a preparation method and application, the preparation method comprises the following steps: step 1, copper ions and zinc ions as metal sources are coordinated with 2-methylimidazole, and Cu / ZIF is obtained through centrifugation, washing and freeze drying; 2, carrying out a replacement reaction on the thiosulfate and a calcium salt to obtain CaS2O3; and 3, fully mixing the Cu / ZIF solution obtained in the step 1 and the CaS2O3 solution obtained in the step 2, adding polyethylene glycol PEG, and fully mixing and reacting to obtain the required nano composite catalyst. According to the invention, Cu / ZIF is wrapped by PEG and CaS2O3 is loaded, Cu / ZIF / Ca / P is obtained, bimetallic zinc and copper are utilized to construct an organic metal framework, CaS2O3 is loaded, and the organic metal framework and CaS2O3 are used for enhancing chemokinetic therapy and calcium death synergistic treatment.

The invention relates to the technical field of precious metal recovery and water treatment, in particular to application of cobalt catalytic activation persulfate in recovery of gold in thiosulfate leachate. The invention provides application of cobalt catalytic activation persulfate in recovery of gold in thiosulfate leachate. The method comprises the following steps: blending a cobalt catalyst, persulfate and a thiosulfate leaching solution containing Au (S2O3) 2 < 3->, and carrying out complex breaking reduction to obtain a gold elementary substance. The CoNC / persulfate technology provided by the invention is proved to be a catalytic system based on singlet oxygen species, has high oxidation capacity and strong complex breaking selectivity, shows remarkable solution acid-base property adaptation and coexisting cation / anion interference resistance, and has ultrahigh recovery selectivity.

A process for recovering dissolved precious metal from an aqueous solution containing thiosulfate and precious metal. The process includes contacting the precious metal- thiosulfate solution with amino acid (or derivative thereof) and activated carbon to adsorb precious metal onto the activated carbon and form loaded activated carbon. The process also includes recovering precious metal from the loaded activated carbon.

The invention provides an environment-friendly gold beneficiation aid and a preparation method thereof. The aid comprises 30-60 parts of a modified thiosulfate complexing component, 15-30 parts of a catalytic stable oxidation component, 8-20 parts of an interface functional component, 10-25 parts of a buffer component and 5-15 parts of a permeation aid. The preparation method comprises the following steps: performing high-shear mixing on the raw materials to obtain a homogeneous mixture; curing and stabilizing the homogeneous mixture to obtain a cured material; and carrying out air jet pulverization on the cured material until D90 is 20-40 microns, so as to obtain the additive product. According to the additive, by innovatively compounding a modified thiosulfate complexing component and a catalytic oxidation system, cyanide pollution is completely eradicated while efficient leaching of gold is achieved, and the additive has the advantages of environmental protection breakthrough and leaching efficiency.

The present invention provides a method for enhancing the anaerobic degradation of chlorinated organophosphates in sludge by using thiosulfate, which comprises the following steps: placing the concentrated sludge containing chlorinated organophosphates in a fermentation tank, adding a thiosulfate solution, sealing it for pretreatment, adding inoculated sludge, purging oxygen by nitrogen bubbling, and sealing the fermentation tank for anaerobic reaction. The thiosulfate accelerates the anaerobic reductive dechlorination process of chlorinated organophosphates in the sludge, promotes the degradation and removal of chlorinated organophosphate pollutants in the sludge, and provides a technical reference for the safe treatment of sludge.

A method of extracting metal values from a starting material using thiosulfate as a lixiviant. Metal values can be recovered from solution using a precipitant. The solution remaining after recovering metal values can be treated with a calcium containing material to remove sulfates. A portion of the solution remaining after recovering metal values can be treated with a water treatment step either before or after the addition of the calcium containing material.

The invention discloses a wastewater autotrophic denitrification method using desulfurization waste liquid as an electron donor, and belongs to the field of coking desulfurization waste liquid resource utilization and wastewater denitrification. It uses thiosulfate and thiocyanate in the desulfurization waste liquid as electron donors to carry out sulfur autotrophic denitrification to remove nitrate nitrogen in the wastewater. The invention uses reduced sulfur in the desulfurization waste liquid as an electron donor for sulfur autotrophic denitrification to remove nitrate nitrogen in the wastewater so that the effluent meets the discharge standard or improves the purity of product salt in zero discharge of wastewater (such as coking wastewater). It has the characteristics of not requiring an external organic carbon source, being able to use a variety of sulfur sources, having low operating costs, high denitrification efficiency, and low sludge production, and realizes waste treatment with waste, and reduces the cost of pollutant disposal and wastewater denitrification.

The present invention relates to the use of thiosulfate to potentiate the anti-pathogenic effect of lactobacilli bacteria, the thiosulfate being in a quantity of at least 100 mg for 107 to 1010 CFU of lactobacilli. The invention also relates to a pharmaceutical composition including at least 100 mg of thiosulfate per gram, in combination with a Lactobacillus crispatus strain, and to its use in the treatment of urogenital infections such as vaginosis, candidosis and urinary tract infections.

Provided in the invention is a stabilized fertilizer composition (I) suitable for use in fertilizers and comprising: Urea (a), One or more compounds (b), One or more urease inhibitors (c1) and / or one or more nitrification inhibitors (c2), optionally provided in one or more carriers (d), said compounds (c) being different from compounds (b), Optionally one or more additives (e) different from any of the above, and Water (f) in an amount less than about 10 wt % and preferably less than about 5 wt %; wherein compounds (b) are selected from thiosulfates (b1) and / or from polysulfides (b2) and / or from (bi)sulfites (b3); and wherein the ratio of urea (a) to compounds (b) is from 1:99 to 99:1, preferably from 2:98 to 98:2. Products of the invention can be made in various forms and in different ways. All of the materials of the invention are suitable for use in fertilizers and blend well with solid and liquid fertilizers standardly used. They have excellent shelf life and provide good urea-N protection.

The invention discloses a method for extracting gold through leaching after preoxidation of sulfide gold ore, and aims to solve the problems of low recovery rate, serious environmental pollution and the like of a traditional gold extraction method. The method comprises the following steps: firstly, mixing and finely grinding the gold sulfide ore and caustic soda flakes to 325 meshes, and adjusting the concentration of ore pulp to 33%; then, oxygen-enriched air is introduced into the reaction kettle and heated to 90 DEG C, pre-oxidation treatment is carried out for 18 hours, sulfide minerals are oxidized and decomposed, and gold particles are exposed; then, adding a golden cicada environment-friendly gold extraction agent and activated carbon for leaching, continuously reacting for 18 hours to form a thiosulfate complex of gold, and adsorbing the thiosulfate complex by the activated carbon; and finally, recovering gold by filtering and analyzing electrolytic activated carbon, and performing dry discharge on tailings to prepare bricks. By implementing the method, the leaching recovery rate of gold can be remarkably increased to 97%, meanwhile, cyanide is prevented from being used, environmental pollution is reduced, comprehensive utilization of resources is achieved, and the method has the multiple advantages of being efficient, environmentally friendly, economical and the like.

The invention provides a method for improving the anaerobic fermentation acid production effect of oxytetracycline-containing sludge by using thiosulfate pretreatment, which comprises the following steps: adding anaerobic sludge of a sewage plant into a fermentation tank as inoculated sludge, adding oxytetracycline and thiosulfate, then blowing nitrogen to drive oxygen, sealing the fermentation tank to degrade oxytetracycline through constant-temperature anaerobic fermentation, and carrying out centrifugal separation to obtain the oxytetracycline-containing sludge. The supernatant is fermentation liquor rich in volatile fatty acid; wherein the total suspended solid concentration of the inoculated sludge is 20-27 g / L, the mass concentration of the thiosulfate in the sludge is 900 mgS / L in terms of S, and the adding concentration of the oxytetracycline is 5-25 mg / L. According to the method, sludge hydrolysis is promoted, a microbial community structure is adjusted and electron transfer is accelerated by utilizing the reducibility of thiosulfate, so that the conversion rate of organic matters to VFA is increased, oxytetracycline is synchronously and efficiently removed, and a new solution is provided for antibiotic pollution control and sludge resource utilization.

The present invention relates method for the production of a thiosulfate comprising the steps ofproviding a thiosulfate A represented by formula (X)n(S2O3)m;providing a compound B represented by formula (Y)o(Z)p;contacting the thiosulfate A of step (i) with the compound B of step (ii) in the presence of a solvent, thereby obtaining a reaction mixture comprising a compound C represented by formula (X)q(Z)r and a thiosulfate D represented by formula (Y)s(S2O3)t;wherein the ratio of the solubility of the thiosulfate D in the solvent at a predetermined temperature to the solubility of the compound C in the solvent at the same predetermined temperature is at least 5:1 or less than 1:5. The invention also relates to liquid fertilizers obtainable by the method of the invention.

The invention relates to the technical field of biological sewage treatment, in particular to an autotrophic flora coupling denitrification method by taking desulfurization waste liquid in the coking industry as electron donors, which comprises the following steps: taking thiocyanate and thiosulfate in the desulfurization waste liquid in the coking industry as the electron donors; efficient removal of nitrate nitrogen in the wastewater is achieved through the coupling effect of the sulfur autotrophic denitrification process and the anaerobic ammonia oxidation process, and meanwhile resource utilization of the desulfurization waste liquid is achieved. In the sulfur autotrophic denitrification process, reducing state sulfur is used as an electron donor to reduce nitrate nitrogen into nitrogen and nitrite nitrogen, meanwhile, thiocyanate is converted into ammonia nitrogen and sulfate, and thiosulfate is converted into sulfate; ammonia nitrogen and nitrite nitrogen are converted into nitrogen in the anaerobic ammonia oxidation process, and a small amount of generated nitrate nitrogen can be continuously used as a substrate in the sulfur autotrophic denitrification process. The method does not need additional organic carbon sources, is low in operation cost, low in sludge yield and environment-friendly, realizes treatment of wastes with wastes, and has economic benefits and environmental protection values.

This invention belongs to the field of hydrometallurgical technology, specifically relating to a method for enhanced gold extraction from cyanide tailings based on magnetically controlled hydrothermal magnetization activation and manganese doping treatment. The method includes: providing cyanide tailings particles; adding the cyanide tailings particles and a biomass reducing donor to an aqueous medium to form a slurry; adjusting the pH of the slurry to obtain an alkaline reaction system; adding a magnetothermal medium of ferric oxide or ferric chloride to the slurry and stirring with MnSO4 to obtain a reaction slurry; placing the reaction slurry in a closed magnetically controlled hydrothermal reactor and conducting a hydrothermal reaction under an external magnetic field; after cooling the reaction product, performing solid-liquid separation; performing graded magnetic separation on the solid phase; leaching the non-magnetic product using a thiosulfate-ammonia system to allow gold to enter the leaching solution; adding a recyclable magnetic gold-capturing carrier to the leaching solution for adsorption and enrichment; recovering the carrier through magnetic separation and regenerating it through analysis to obtain a gold-rich solution; and recovering gold from the gold-rich solution. The above method can stably achieve a synergistic gain in gold extraction and harm reduction under low-temperature hydrometallurgical conditions.

The present application relates to a method for purifying citalopram or S-citalopram or their salts. The method comprises treating citalopram or S-citalopram with a water-soluble solution containing sulfite or thiosulfate, and then taking the organic layer, and further separating to obtain citalopram or S-citalopram free base; or adding acid to form a salt, and separating to obtain citalopram or S-citalopram acid salt. The purification method provided by the present application is simple in operation and high in impurity removal rate.

The invention relates to the technical field of stainless steel surface treatment, and discloses a chromium-free stainless steel passivator and a passivating treatment method.The passivator is prepared from, by mass, 5-10 parts of urea and inorganic ceramic graphene oxide mixture; 2-5 parts of a silane coupling agent; 3 to 7 parts of iron doped nano titanium dioxide Fe-TiO2; 2-6 parts of a mixture of molybdenum disulfide and titanium dioxide; 5 to 10 parts of poly (ethylene 2, 5-furandicarboxylate); 2 to 5 parts of thiosulfate; 3-8 parts of a water-soluble derivative of alginic acid; 1-3 parts of hydrogen peroxide; the passivating agent is prepared from the raw materials, the surface of a stainless steel workpiece is cleaned, electrophoresis passivating treatment is conducted, the passivated stainless steel workpiece is washed with deionized water and put into a drying box to be dried, and quality detection is conducted on the stainless steel workpiece subjected to post-treatment. And it is detected that the formed passive film has the advantages of ideal thickness, excellent corrosion resistance, high hardness and good adhesive force and chemical stability.

The disclosure relates to a method for opening arteries that are occluded with calcium in a subject in need thereof, the method comprising applying a topical thiosulfate composition comprising a therapeutically effective amount of thiosulfate to an area of the subject's body comprising an artery occluded with calcium.

The present application relates to a kind of sulfur autotrophic denitrification fillings and its preparation method, belong to the sulfur autotrophic denitrification technical field of river and lake ecological management field, including mass ratio 1:1.2:0.2:0.1:0.01 of A component, B component, C component, D component, E component, the A component includes mass ratio 5:3:1:1 of sulfur powder, siderite powder, thiosulfate and active clay;The B component is alginic acid propylene glycol ester aqueous solution;The C component is the mixture of binder and volatile agent with mass ratio 5:2;The D component is hydrogen sulfide remover, neutralizing agent and digestion agent with mass ratio 5:3:2;The E component is denitrifying sulfur bacteria.The present application is a kind of low-cost treatment technology for sulfur autotrophic denitrification, and biological can use sulfate in water to complete denitrification by itself, without the support of external energy, can significantly reduce cost.

The invention discloses a denitrification method utilizing thiosulfate autotrophic short-cut denitrification and anaerobic ammonia oxidation coupling, and belongs to the field of sewage treatment. The invention aims to solve the problems of strong carbon source dependence, incomplete removal of NH4 < + > and NO3 <->, easy accumulation of NO2 <-> and poor system stability in the existing low C / N ratio wastewater denitrification process. The method comprises the following steps: 1, preparing inoculated sludge; 2, setting operation conditions of the reactor; and 3, operating the reactor. The method is used for denitrification by utilizing thiosulfate autotrophic short-cut denitrification and anaerobic ammonia oxidation coupling.

Methods of preparing lyophilized lipid nanoparticle-nucleic acid compositions are provided. The methods comprise preparing a suspension of lipid nanoparticles with a monosaccharide and one or more excipients selected from thiosulfate, potassium sorbate, sodium benzoate, and iodixanol. Lyophilized lipid nanoparticle-nucleic acid compositions and methods of reconstituting and administering the same are further provided.

The present invention relates to the field of pesticide preparation, and discloses a method for preparing a sulfentrazone intermediate and its application. The structure of the sulfentrazone intermediate is shown in Formula 1. The method includes: mixing a chloro-isoxazole, a metal sulfide and a thiosulfate for reaction to obtain the sulfentrazone intermediate. By using the thiosulfate and the metal sulfide to react with the chloro-isoxazole, the method effectively inhibits the generation of by-products, and at the same time greatly improves the product yield of sulfentrazone, having greater industrial application prospects.