53 results about "Thiosulfate salt" patented technology

The invention discloses a carlin type gold concentrate in-situ self-excitation and enhanced gold leaching method which comprises the following steps: adding an oxidizing agent and an alkaline reagent into a carlin type gold concentrate ore pulp system in a continuous, slow and proper adding manner at normal temperature and normal pressure, maintaining the oxidation potential of the ore pulp system to be-600 to-15.3 mV and the pH value to be 7 to 11, and carrying out in-situ self-excitation and enhanced gold leaching on the carlin type gold concentrate; and gold-loaded sulfide minerals in the gold concentrate are subjected to in-situ oxidation in a leaching system to generate stable thiosulfate as a gold leaching agent, so that in-situ self-excitation and enhanced gold leaching of the Carlin type gold concentrate are realized. According to the method, thiosulfate is formed through in-situ self-excitation, meanwhile, gold is extracted through in-situ complexing, consumption of external thiosulfate is reduced, pretreatment is not needed in the gold leaching process, the technology is simpler, the production cost is lower, the good gold extraction rate is guaranteed, meanwhile, no special requirement for equipment is needed, and the system is more controllable.

The invention discloses a device and a method for recycling gold ions in copper ammonia thiosulfate leachate, and belongs to the technical field of hydrometallurgy and precious metal recycling. An anode chamber and a cathode chamber which are physically and spatially isolated are built, so that the reduction reaction of the gold ions is only carried out in the cathode chamber, and only the oxidation reaction of metal zinc is carried out in the anode chamber. In order to avoid deposition of copper ions in the gold ion reduction process, before gold deposition, the existence form of the copper ions is regulated and controlled, Cu (NH3) 4 < 2 + > in a solution is converted into Cu (S2O3) 35 <-> which is difficult to deposit, then gold deposition is carried out, and after gold deposition is completed, the Cu (S2O3) 35 <-> in the solution is recovered to Cu (NH3) 4 < 2 + > by means of regulation and control of an electrochemical method. And the solution after gold ion deposition can be returned to the leaching stage for recycling under the condition that the copper ion concentration is not interfered.

The invention provides a clean gold leaching agent system for treating gold-bearing minerals and a gold leaching process, and belongs to the technical field of hydrometallurgy. According to the clean gold leaching agent system for treating the gold-bearing minerals, on the basis that thiosulfate serves as a gold leaching agent main body and metal cupric salt serves as a catalyst, a leaching auxiliary agent replacing ammonia, amine and ammonium is designed. In the gold leaching process, the leaching auxiliary agent and bivalent copper ions are subjected to chelation reaction at first, a copper-chelation product has moderate dissolving performance under the alkaline condition, the gain catalysis effect on gold leaching of thiosulfate is achieved, meanwhile, overflow of ammonia gas is avoided, and the leaching efficiency is improved. Clean extraction of gold in the gold-bearing minerals by the thiosulfate leaching system is achieved, a series of problems that in the prior art, the gold leaching effect is poor, ammonia gas overflows in the gold leaching process and the like due to the fact that copper ions of a copper ammonium system are converted into precipitates are solved, and a potential alternative scheme is provided for the field of hydrometallurgy of gold ores in the gold industry.

The invention discloses a selective gold extraction process by a thiosulfate method, which comprises the following steps of: adding gold ore and anion exchange resin into an aqueous solution of a leaching agent, and stirring and leaching to obtain ore pulp containing gold-loaded resin; the leaching agent comprises thiosulfate, copper salt and ammonia water; separating the gold-loaded resin from the ore pulp, and desorbing the gold-loaded resin by adopting a desorption agent to obtain a gold-rich desorption solution; and adding dithionite into the gold-rich desorption solution for reduction to obtain an elemental gold product. According to the process disclosed by the invention, resin adsorption and recovery are synchronously realized during gold leaching, and coadsorption of copper is avoided, so that gold can be enriched by adopting the gold-loaded resin through one-section desorption, and the gold extraction process flow is greatly simplified. In addition, the process is high in gold leaching rate, short in leaching time, low in agent consumption and low in leaching cost. In addition, the resin can be directly and circularly used for gold leaching without regeneration, the reduction barren solution can be circularly used for desorption of the gold-loaded resin by supplementing a small amount of desorption agent, and the recovery cost is low.

The invention discloses a short process method for extracting precious metals by integrating thiosulfate electrochemical leaching and recovery, which includes: dissolving thiosulfate and an electrolyte, adding an alkaline solution, stirring evenly to obtain an electrolytic solution; adjusting the pH of the electrolytic solution to 7-13, then placing the electrolytic solution and materials containing precious metals in the electrolytic cell, and using an electrode system set in an electrolytic cell for electrolysis reaction, so that precious metals are leached at the anode and deposited at the cathode; collecting precious metals deposited on the cathode. This invention can simultaneously achieve the integrated extraction of anode precious metal leaching and cathode precious metal ion electrolytic deposition, as well as precious metal leaching and recovery in one reaction device; It has the advantages of high extraction efficiency, short process flow, low reagent consumption, low energy consumption, and no pollution.

The invention discloses a method for green and efficient recovery of gold from refractory gold ore. The green and efficient gold recovery method for the refractory gold ore comprises the following steps that biological oxidation pretreatment is conducted on the refractory gold ore, and biological oxidation ore pulp is obtained; adjusting the pH value of the biological oxidation ore pulp, standing for 1-3 days to carry out bacterial inactivation on the biological oxidation ore pulp, then adding a proper amount of iron-based ligand to adjust the potential of the biological oxidation ore pulp to a proper range, and then adding a proper amount of thiosulfate to carry out in-situ leaching to obtain leached ore pulp; and the leaching ore pulp is filtered and separated, and gold leaching liquid and leaching residues are obtained. According to the method for green and efficient gold recovery from the refractory gold ore, a biological oxidation pretreatment method and a weakly acidic iron-based thiosulfate in-situ leaching process are combined, acid-base conversion of ore pulp is not needed, and green and efficient leaching of gold in the refractory gold ore can be achieved with the low production cost and the short process.

A process for removing a heavy metal, such as mercury (Hg), from thturboe surface of a component used in the oil and gas industry, such as a sampling bottle or piece of equipment, is provided. The process includes applying an organic solvent, which includes iodine, to the surface of the component and then applying an aqueous solution to the surface. The organic solvent can also include toluene, xylene, a mixture thereof, or suitable organic solvents. The aqueous solution can consist of anions that form a soluble complex with the heavy metal, such as thiosulfate (S2O3)2-, iodide (I-), or a thiosulfate salt. According to another embodiment, the aqueous solution includes I2 and I-, and the process further includes applying an acid having a pKa ranging from -14 to 2 to the surface followed by deionized water.

The application discloses a gold leaching method for pyrite-containing gold ore, and comprises the following steps: after the pyrite-containing gold ore is finely ground, water is added to obtain a slurry; a gold leaching reagent solution is added into the slurry to obtain a mixed leaching solution; the pH value of the mixed leaching solution is adjusted to alkaline, and leaching treatment is performed; and after filtration, a gold-containing leaching solution is obtained; the gold leaching reagent solution comprises polyphosphate, copper salt and thiosulfate; in the gold leaching reagent, polyphosphate is added; under alkaline conditions, polyphosphate ions can be selectively adsorbed or complexed on the surface active sites of pyrite to form a physical or chemical masking layer, thereby effectively blocking the direct contact of pyrite with dissolved oxygen and thiosulfate in the solution, inhibiting the catalytic decomposition of pyrite, significantly reducing the invalid consumption of thiosulfate, stabilizing the pH value and potential of the leaching system, and guaranteeing the efficient leaching of gold.

The invention provides a flow battery containing a thiosulfate and potassium sulfide mixed electrolyte, a negative electrode electrolyte is a mixed solution formed by dissolving thiosulfate and potassium sulfide in a supporting electrolyte solution, the concentration of thiosulfate ions (S2O3 < 2->) is 0.1-2 mol / L, and the molar ratio of potassium sulfide (K2S) to potassium thiosulfate (K2S2O3) ranges from 1: 0.2 to 1: 2; and the supporting electrolyte is an alkaline or neutral electrolyte solution with the concentration of 1-3 mol / L. By introducing thiosulfate radical (S2O3 < 2->), the thiosulfate radical and elemental sulfur form a soluble polythiosulfate complex in a negative electrode electrolyte, solid sulfur deposition is effectively inhibited, and the problems of electrode pore blockage, flow channel blockage, active substance loss and the like caused by solid sulfur deposition in an existing polysulfide or sulfide system flow battery are solved.

The present invention discloses a method for eliminating the influence of associated calcium iron pyroxene in thiosulfate leaching process, and belongs to the field of hydrometallurgy. The specific process of the present invention is to first place the associated calcium iron pyroxene gold mine in a pretreatment solution containing sodium hydroxide, ammonium bifluoride or a mixture of the two and a mixture of sodium fluoride and acid for stirring pretreatment. Then, the treated mineral is placed in a copper ammonia thiosulfate solution for leaching, so as to reduce the consumption of thiosulfate and improve the leaching rate of gold in the associated calcium iron pyroxene gold mine; the present invention effectively solves the problem that thiosulfate leaching of the associated calcium iron pyroxene contained in the gold mine causes high thiosulfate consumption and low leaching rate of gold; it has the advantages of simple process, easy control, efficient gold leaching, etc.

The present invention relates to a hydrogel comprising at least one hyaluronic acid or a salt thereof, crosslinked and / or non-crosslinked, at least one anesthetic and at least one thiosulfate salt. The invention also relates to the use of the hydrogel according to the invention in the prevention and / or cosmetic treatment of an alteration of the surface appearance of the skin.

The invention provides a novel lithium, rubidium and cesium co-extraction method for reducing and roasting lepidolite at low temperature by compounding calcium salt with thiosulfate, and belongs to the technical field of extraction of lithium, rubidium and cesium from lepidolite concentrate. Based on the problems of high energy consumption, large slag yield, serious tail gas pollution and the like of a traditional sulfate roasting method, the following changes are made: a roasting aid is changed into a mixture of sodium salt and calcium salt, so that the cost of the roasting aid is reduced by 10-30%; wherein the sodium salt destroys the lattice structure of lepidolite concentrate through a reduction reaction, the leaching rate of lithium, rubidium and cesium is increased by 3%-5%, the calcium salt realizes fluorine fixation through the reaction of calcium ions and fluorine ions, the amount of tailings generated by roasting is reduced by 30%-50%, and tail gas purification is not needed; on the basis of a traditional roasting method, a novel tubular furnace roasting temperature rising procedure is fused, and the roasting heat efficiency is improved by 30% through different reactions in different time zones. In conclusion, the method has high research value and application prospect in improvement of the leaching rate of lithium, rubidium and cesium and treatment of tailings.

A thiosulfate sensor having an electrode assembly including a sensing electrode including electrochemically deposited metal, a counter electrode, and a reference electrode is described. The thiosulfate sensor further includes an electrolyte chamber including an electrolyte solution therein, the electrolyte chamber receiving the electrode assembly through a first opening to immerse the electrode in the electrolyte and an electrolyte chamber porous membrane covering a second opening, where the porous membrane is configured to receive a flowing fluid therethrough to allow the detection of thiosulfate in the flowing fluid.

The invention belongs to the technical field of coal-fired flue gas demercuration, and particularly discloses a demercuration adsorbent as well as a preparation method and application thereof. The method provided by the invention comprises the following steps: mixing an organic heavy liquid with alcohol solvents in different proportions to obtain a first mixed solution, a second mixed solution and a third mixed solution with different densities; respectively adding fly ash into the first mixed solution, the second mixed solution and the third mixed solution, centrifuging, respectively taking upper-layer mixtures, uniformly mixing, and carrying out solid-liquid separation to obtain a mixed material; adding the mixed material into a mixed saline solution for dipping, and carrying out solid-liquid separation to obtain a mercury removal adsorbent; the mixed salt in the mixed salt aqueous solution is a mixture of halide and thiosulfate. The maximum adsorption capacity of the demercuration adsorbent prepared by the preparation method of the demercuration adsorbent provided by the invention can reach 15.68 mu g / g, and the mercury removal rate can reach 99.53%.

The present invention discloses a sulfide-nitrate collaborative purification method, comprising: Ru / WO supported on carbon paper 3‑x The catalyst is the cathode, and the nitrate solution with a pH value of 0 to 7 is used as the cathode electrolyte. x The catalyst serves as the anode, a sulfide solution with a pH of 12 to 14 serves as the anolyte, and a proton exchange membrane is placed between the cathode and anode to construct a flow battery that performs a catalytic redox reaction to purify sulfide and nitrate. The present invention also discloses a sulfide-nitrate coordinated purification device corresponding to the flow battery structure. This device utilizes a catalytic redox reaction to simultaneously convert sulfide and nitrate into thiosulfate and ammonia, while also generating electrical output.

The present invention relates to methods for the production of a solid urea-thiosulfate fertilizer wherein the method comprises preparing a liquid urea-thiosulfate blend comprising 70-90 wt. % urea and 10-30 wt. % thiosulfate salt and processing this blend in liquid form. Various process steps such as evaporation and / or transport to the solidification apparatus can be performed with decreased energy usage and decreased thiosulfate decomposition since the melting point of the blend is significantly lower than the melting point of a regular urea melt.

The invention discloses a device and a method for preparing a thiosulfate solution at normal temperature based on elemental sulfur, the device and the method are characterized in that two sections of sulfur packed beds are arranged, an alkali source and water are pumped into the two sections of sulfur packed beds, the first section of sulfur packed bed maintains anaerobic conditions, and the smooth proceeding of a sulfur biological disproportionation reaction is ensured; then, the second-section sulfur packed bed is aerated, so that generation of thiosulfate is promoted, and the high-concentration thiosulfate solution can be efficiently prepared through the process.

The invention relates to the technical field of irrigation, and discloses a coastal wetland plant maintenance system and method.The method comprises the steps that firstly, concentration spatial distribution of thiosulfate and tetrathiosulfate in a root domain is obtained, the spatial position and the peak shape curvature of a concentration ratio peak are determined based on the concentration spatial distribution, and meanwhile the outer edge spatial position of a root surface iron plaque is determined; calculating position deviation and curvature deviation between the two; further measuring the root domain volume and the ion strength and sulfate radical concentration of pore water; then, a small amount of fresh water and brackish water are injected into the root domain, the spatial position of a concentration ratio peak and the change rate of curvature are observed, and the hydrochemistry and root domain reaction relation is established; according to the deviation and the change rate, the required ion strength and the sulfate radical concentration adjustment amount are solved, the volume of fresh water and the volume of brackish water required by single-time maintenance are accurately converted according to the root domain volume and the ion characteristics of different water sources, and therefore scientific regulation and control over the coastal wetland plant root domain environment are achieved.

The invention relates to a reinforced product based on at least one metallic reinforcing element and a rubber composition based on at least one diene elastomer, a reinforcing filler and a sulfur-based crosslinking system, the rubber composition comprising at least one ascorbate derivative of general formula (I): (I) in which n is an integer equal to 1 or 2, represents an ascorbate compound and B represents a hydrogen atom or an alkali or alkaline earth metal, said rubber composition comprising a thiosulfate salt and at most 0.1 pc of a transition metal salt.

The invention discloses a quantitative analysis method for sulfur-containing ions in a thiosulfate leaching system. The quantitative analysis method for the sulfur-containing ions in the thiosulfate leaching system comprises the following steps: obtaining a plurality of isopyknic solutions to be detected; carrying out pretreatment and iodine titration on each part of the to-be-detected solution to obtain the titration volume of each part of the to-be-detected solution; and calculating the concentration of each sulfur-containing ion in the to-be-detected liquid according to the titration volume of each part of the to-be-detected liquid. The quantitative analysis method for the sulfur-containing ions in the thiosulfate leaching system provided by the invention is simple and convenient to operate, has wide applicability and can be used in laboratories and industrial sites; the method is accurate in determination and small in error (+ / -0.2%).

This application provides a gold leaching reagent system and its heap leaching process for treating low-grade gold ore, belonging to the field of hydrometallurgy. The gold leaching reagent system includes a main leaching agent, a catalytic leaching agent, and a stabilizer; wherein the main leaching agent is glycine, the catalytic leaching agent is anhydrous sodium thiosulfate, and the stabilizer is an organic ammonium salt. This application constructs a ternary stable and synergistic system of sodium thiosulfate-glycine-organic ammonium salt by introducing an organic ammonium salt with a specific structure. This optimizes the traditional thiosulfate gold leaching process from both thermodynamic and kinetic perspectives. The organic ammonium salt cations can dynamically adsorb around the thiosulfate ions in solution through intermolecular interactions, forming an effective shielding layer. This significantly inhibits the side reaction of sodium thiosulfate being oxidized and decomposed into sulfate and other ineffective products by dissolved oxygen, maintaining the long-term stability of the effective components in the leachate. This gold leaching reagent system has comprehensive advantages such as high leaching efficiency, good reagent stability, environmental friendliness, and low operating costs.

Disclosed in the present invention is a method for thiosulfate-based electrochemical leaching-recycling integrated short-process extraction of a precious metal. The method comprises: dissolving a thiosulfate and an electrolyte, then adding an alkali liquor thereto, and stirring same until uniform to obtain an electrolyte solution, wherein the electrolyte is a salt which does not contain a thiosulfate; adjusting the pH value of the electrolyte solution to 7-13, then placing the electrolyte solution and a material containing a precious metal into an electrolytic bath, and performing an electrolysis operation using an electrode system arranged in the electrolytic bath so as to achieve the leaching of the precious metal at an anode and the deposition thereof at a cathode, the voltage of the electrolysis operation being 0.1-3 V; and collecting the elemental precious metal deposited on the cathode. The present invention can achieve both the leaching of a precious metal at an anode and the electrolytic deposition of precious metal ions at a cathode in one reaction device, realizes integrated extraction of a precious metal by means of synchronous leaching and recycling, and has the advantages of high extraction efficiency, a short technological process, low reagent consumption, low energy consumption, no pollution, etc.

To provide a bicarbonate bath additive that allows reduction of chemical stress to sustain a parasympathetic-dominant condition, and causes capillaries to dilate to double their size so as to quickly enhance blood circulation; and its production method.SOLUTION: The bicarbonate bath additive is produced by using materials comprising a bicarbonate salt (sodium hydrogen carbonate), an organic acid (citric acid), a lubricant (sodium alkanesulfonates having 14 to 18 carbon atoms, sodium tetradecenesulfonate, sodium n-octanesulfonate), and chlorine-neutralizing compounds (L-ascorbate, thiosulfate, sulfite, tea catechin, erythorbate), wherein a weight ratio of the organic acid (citric acid) to the bicarbonate salt (sodium hydrogen carbonate) is 1 / 8 to 2 / 7.SELECTED DRAWING: Figure 3

The invention provides a cobalt-doped cadmium sulfide aerogel material and a preparation method and application thereof, and belongs to the technical field of precious metal recovery, the cobalt-doped cadmium sulfide aerogel material comprises chitosan aerogel and cobalt-doped cadmium sulfide loaded on the chitosan aerogel, and the mass ratio of the chitosan aerogel to the cobalt-doped cadmium sulfide is 0.16: (0.1-0.15); the mass ratio of cobalt to cadmium sulfide in the cobalt-doped cadmium sulfide is 0.5: (2-3). According to the method, Co atoms are anchored on the surface of CdS, so that the electron density of active sites on the surface of the material is remarkably improved, the coordination adsorption capacity on gold ions is enhanced, and enrichment and reduction of the gold ions are promoted. And the three-dimensional structure material aerogel is combined, so that the contact efficiency of the material and the gold ions is remarkably improved, and efficient recovery of the gold ions is promoted. The adopted chemical reduction adsorption technology has a good recovery effect on gold in the thiosulfate gold leaching liquid, and the gold recovery rate close to 100% can be achieved.

The application belongs to the technical field of rubber auxiliaries, and specifically provides a composite anti-reversion agent for vulcanization and a preparation method thereof. The composite anti-reversion agent for vulcanization comprises thiosulfate, bismaleimide, organic sulfur stabilizer, polyethylene wax, stearic acid, fatty acid ester, zinc stearate, antioxidant and pentaerythritol stearate. The preparation method of the composite anti-reversion agent for vulcanization is as follows: after high-speed blending of the components, melt extrusion and granulation are performed. The composite anti-reversion agent for vulcanization can form short sulfur bonds or carbon-carbon bonds with good thermal stability, thereby greatly inhibiting the reversion of vulcanization. The bismaleimide is modified by a furan derivative, thereby further improving the anti-reversion effect of vulcanization. The thiosulfate is treated by zinc oxide, thereby further improving the anti-reversion effect of vulcanization.

This invention discloses a deep-sea bacterium capable of heterotrophic aerobic growth and autotrophic sulfur oxidation and denitrification, and its applications. The bacterium is *Lihuangiaoceani*, strain number D14, registered at the China General Microbiological Culture Collection Center (CGMCC) No. 1.13774. This *Lihuangiaoceani* possesses facultative sulfur oxidation and denitrification capabilities, enabling heterotrophic growth under aerobic conditions and denitrification using organic matter and / or sodium thiosulfate under anaerobic conditions. It can utilize nitrate as an electron acceptor for sulfur oxidation under anaerobic conditions and oxygen as an electron acceptor for sulfur oxidation under aerobic conditions. It can be used to remove nitrates and thiosulfates from polluted water bodies or sediments, or for wastewater treatment in landscape water, urban rivers, and aquaculture, as well as for the remediation of eutrophic rivers and lakes.

The present invention relates to the use of a hydrogel in the prevention and / or cosmetic treatment of alterations in the skin's surface appearance, said hydrogel comprising at least one functionalized hyaluronic acid, optionally cross-linked, and at least one thiosulfate salt. The invention also relates to a hydrogel comprising at least one functionalized and cross-linked hyaluronic acid, and at least one thiosulfate salt. Figure for the abstract: None

This invention provides a control system and method for the generation of thiosulfate from sulfides. The system includes: a microchannel reactor, used to perform operations corresponding to the preset requirements on the internal airflow and sulfide waste alkali solution when the reaction conditions reach the preset requirements, and to transport the generated reaction products to a gas-liquid separation unit; the gas-liquid separation unit, connected to the microchannel reactor via pipeline, is used to separate the reaction products into gas and liquid phases, and, based on triggering different reaction conditions, controls a circulating pump to deliver sulfide waste alkali solution and / or separated liquid to the microchannel reactor. This embodiment of the system, by setting up a microchannel reactor, not only accelerates the mass transfer rate from air to the liquid phase, thereby accelerating the oxidation reaction of sulfides and effectively shortening the reaction time; but also, by combining the microchannel reactor and the gas-liquid separation unit, it can achieve automated preparation of thiosulfate, improving the conversion efficiency of sulfides.

The invention provides a combined membrane method resourceful treatment device and process for a desulfurization solution, and belongs to the technical field of industrial wastewater treatment. The device comprises a plate-and-frame filter press, a homogeneous membrane / reverse osmosis membrane, a nanofiltration membrane, an activated carbon decoloration tank, an evaporator, a first cooling pelleter, an ultrasonic-assisted ozone centrifugal reactor, a sulfur melting kettle, a second cooling pelleter, an ultrafiltration membrane and a bipolar membrane. By means of the synergistic effect of ultrasonic cavitation and ozone oxidation, thiosulfate is efficiently decomposed, elemental sulfur is directionally generated, and a high-quality sulfur product is obtained by matching with refining of the sulfur melting kettle; meanwhile, thiocyanate and sulfate / thiosulfate are accurately separated through a nanofiltration device, a high-purity thiocyanate product is produced through activated carbon decoloration and evaporation concentration, then bipolar membrane electrodialysis is used for directly converting sulfate into recyclable acid and alkali, various high-value resources are systematically recycled, and the method is suitable for industrial production. The problems of low resource recovery rate and insufficient product purity of the traditional process are solved.

Disclosed in the present invention is a precious metal leaching method based on electrochemical oxidation and a thiosulfate salt, comprising: by using a thiosulfate salt-electrolyte-alkali liquor system as an electrolyte solution, adding a precious metal material into an anode chamber of an electrolytic cell, and connecting a cathode and an anode provided in the electrolytic cell to an external power supply, to leach a precious metal by electrochemical oxidation, wherein the electrolyte is a salt other than a thiosulfate salt. In the present invention, precious metals are extracted by an electrochemical thiosulfate salt method, the leaching effect is superior to that of existing copper-ammonia technology, and efficient and green extraction of precious metals (such as gold and silver) can be achieved; the present invention avoids the addition of large amounts of oxidants such as copper, and significantly reduces the consumption of thiosulfate while improving the leaching rate of precious metals, thereby reducing the cost of leaching agents, promoting green and sustainable development of the precious metal industry, and facilitating industrial application.