738 results about "Cyanide" patented technology

The invention discloses a cyanide-free cadmium-iron alloy plating process for high-strength structural steel. The cyanide-free cadmium-iron alloy plating process comprises the step that a nickel-titanium alloy plating layer, a cyanide-free cadmium-iron alloy plating layer and a hexavalent chromium passivation film are sequentially prepared on a high-strength structural steel substrate from inside to outside. The prepared sample piece is subjected to a hydrogen brittleness test according to HB 5067.1-2005 Part 1 of hydrogen brittleness test of plating process: Mechanical Method, and the test result meets the standard requirement; the surface of a plated part is free of white rust after being subjected to an acetate mist test for 400h according to GB / T 10125-2021 Artificial Atmosphere Corrosion Test Salt Spray Test, and a plating layer of the plated part has excellent corrosion resistance; according to GB / T 5270-2005 < GB / T 5270-2005 < GB / T > 5270-2005 < GB / T > 5270-2005 > < GB / T > 5270-2005 > < GB / T > 5270-2005 > < GB / T > 5270-2005 > < GB /

The invention provides a cyanide breaking agent and method for treating alkaline cyanide-containing wastewater. The cyanide breaking agent is a combination of an oxidizing agent, a Fe3O4 ZIF-8 core-shell magnetic catalyst and PDMS-hydrophobic silicon dioxide composite liquid. Through a catalytic oxidation-adsorption integrated method, the reaction path is shortened, efficient removal of cyanide is realized, the effluent is far lower than 0.5 mg / L specified by the national standard, a recyclable product is obtained, and the risk of secondary pollution caused by HCN or heavy metal precipitation is reduced; non-photocatalytic nanoscale Fe3O4-ZIF-8 core-shell magnetic catalyst particles are combined with PDMS-hydrophobic silicon dioxide composite liquid to cooperate with an oxidizing agent, the process that cyanide is converted into non-toxic products through integrated two-stage oxidation is promoted, and meanwhile the content of ammonia nitrogen in wastewater is further reduced by combining modified activated carbon.

The invention relates to the technical field of sewage treatment, in particular to a wastewater recycling method which comprises the following steps: cyanide breaking: in an alkaline environment, adding an oxidizing agent to oxidize wastewater; first monitoring: monitoring the oxidation reduction potential and the free cyanide concentration in real time, and adjusting the adding proportion of sodium hypochlorite based on the ORP dynamic range and the cyanide concentration attenuation rate; precipitation: adding hydroxide, and carrying out heavy metal precipitation; second monitoring: acquiring component information in the sewage, and adding sodium hydroxide and sodium sulfide in a gradient compensation manner after triggering judgment; membrane treatment: performing filtration and degradation treatment through a biological membrane; 3, monitoring: dynamically adjusting the aeration intensity and the backwashing period according to the coupling relationship between the pressure difference slope and the sludge concentration; and 4, monitoring: calculating a process capability index, judging whether the process capability index is smaller than a third threshold value, and if so, adjusting the sodium sulfide dosage in the precipitation stage. The method has the effect of reducing resource waste in the wastewater treatment process.

The invention belongs to the technical field of solid pollutant treatment, and particularly relates to a method for removing cyanide in cyanidation tailings through metal activated persulfate oxidation. The problems that different cyanide removal mechanisms are different, the removal efficiency is low, the cost is high, secondary pollution is easily caused and the like exist in treatment of the cyanidation tailings. The tailings are subjected to cyanogen reduction treatment by adopting a stage treatment method. The method comprises the following steps: firstly, crushing the tailings to prepare a charcoal-loaded metal composite material Me / BC; when free cyanide in the tailings is smaller than or equal to 50 mg / kg, Me / BC activated persulfate is used for conducting cyanide reduction treatment on the tailings; when the tailings contain free cyanide gt; when the concentration is 50 mg / kg, free cyanides in the tailings are removed through leaching, and then Me / BC is used for activating persulfate to degrade strong complex state cyanides in the tailings. By adopting the method, the problems that complex cyanide is difficult to remove by a single leaching method and persulfate is large in dosage and high in cost in a single oxidation method can be solved, and the cascade cyanogen removal method is efficient, low in cost and free of secondary pollution.

The utility model discloses a thermal hydrolysis cyanide breaking device, which relates to the technical field of wastewater treatment and comprises a cyanide breaking reactor, a wastewater heat exchanger, a pipeline mixer, a steam mixer, an instrument control valve and the like. After being heated by the wastewater heat exchanger, the wastewater enters a cyanide breaking reactor, and steam enters a steam mixer to heat the wastewater to a specified temperature and then enters the cyanide breaking reactor. The characteristic that the cyanide aqueous solution is easy to hydrolyze is utilized, so that the cyanide aqueous solution is hydrolyzed at the temperature of higher than 140 DEG C to produce sodium formate and ammonia, the toxicity of cyanide is eliminated, high-temperature wastewater discharged from the cyanide breaking reactor enters the wastewater heat exchanger to exchange heat with wastewater to be treated, and heat is recovered; the pressure of the reactor is controlled through a wastewater heat exchanger outlet wastewater outlet pipeline pressure regulating valve. The cyanide wastewater treatment device is reasonable in design, only a small amount of sodium hydroxide is needed for adjusting the pH of wastewater, no chemical agent needs to be added in other procedures, the cyanide wastewater treatment efficiency is improved, and the cost is saved.

The invention discloses a track kiln for preparing high-strength basalt aggregate from cyanidation tailings, and relates to the technical field of solid waste recycling, the track kiln comprises a base, a track and a kiln car, the track is fixedly mounted at the top of the base, and the kiln car is internally provided with a self-propelled structure and can travel along the track; the device further comprises a side frame fixedly connected to the top of the kiln car, hollow shafts are symmetrically and fixedly connected to the inner side of the side frame, and the sides, close to each other, of the two hollow shafts are fixedly connected with center gears. Raw materials are conveyed in the form of arranging the tunnel kiln, the raw materials are contained in the trays in the conveying process, the materials move in a static mode along with the kiln car, no relative rolling exists between particles, large friction does not exist between the raw materials and between the raw materials and the conveying system, and particle shape damage caused by friction is reduced; the problems that irregular-structure raw material particles outside the raw materials are crushed or rubbed flat due to mutual friction of the raw materials, irregular forms cannot be reserved, and the mechanical property of the aggregate is affected are solved.

The invention relates to a flow battery carbon-based electrode and a preparation method and application thereof, and the preparation method comprises the following steps: respectively dissolving cobalt salt and alkali in a polar organic solvent, and uniformly mixing to form a precursor solution; placing a carbon-based material in the precursor solution, and carrying out a hydrothermal reaction to obtain a carbon-based electrode precursor; and performing high-temperature carbonization on the carbon-based electrode precursor in an inert atmosphere, cooling to room temperature after the reaction is completed, and then cleaning and removing impurities from a product to obtain the carbon-based electrode, the polar organic solvent is at least one of formamide, acetonitrile and N, N-dimethylformamide; after cobalt cyanide is deposited on the surface of the carbon-based material, surface etching and nitrogen doping are carried out on the carbon-based material under the high-temperature condition, surface modification of the carbon-based material is achieved, the contact area of the surface of the carbon-based electrode and electrolyte is increased, and the electrochemical performance of the carbon-based electrode is improved.

The invention discloses an electrolyte based on a fluorine-containing polynitrile compound and a high-voltage supercapacitor, and belongs to the field of energy storage materials. The electrolyte comprises a fluorine-containing polynitrile compound, an organic solvent and electrolyte salt; the structure of the fluorine polynitrile compound is as follows: Fm-A-(CN) n, wherein A is C1-C10 alkyl, C6-C14 aryl or a heteroatom-containing linking group, m is greater than or equal to 1, and n is greater than or equal to 2. By introducing the Fm-A-(CN) n structure compound and utilizing the synergistic effect of fluorine atoms and cyano groups, a stable interfacial film is formed on the surface of an electrode, so that the working voltage of the electrolyte is increased to 3-3.2 V. The capacitance decay rate of the electrolyte in the range of 60-80 DEG C is lt; the method is suitable for the fields of vehicle-mounted energy storage, power grid frequency modulation and the like.

The embodiment of the invention relates to the photovoltaic field, and provides a cyanide-free electroplating silver-coated copper conductive material, a preparation method thereof and a crystalline silicon solar cell. The silver-coated copper electrode provided by the embodiment of the invention comprises a copper core and a copper-tin alloy electroplated layer coated on the surface of the copper core, the surface of the pre-plating material is coated with the silver electroplating layer; the surface of the silver-coated copper material is coated with the self-repairing layer; wherein the self-repairing layer comprises a resin film and a pH response type microcapsule, the microcapsule is embedded in the resin film, and the microcapsule is filled with an ammonium molybdate corrosion inhibitor. The copper-silver interface bonding force can be improved through the copper-tin alloy electroplated layer, and the silver layer material does not contain cyanogen and is environmentally friendly; the corrosion inhibitor in the pH response type microcapsule in the self-repairing film layer on the surface of the silver layer is released under a specific pH condition to form a protection film on the silver layer again, so that the self-repairing purpose is achieved, and the dynamic protection effect is achieved.

According to the harmless filling method and system for the cyanide-containing tailings, cyanide-containing tailing slurry is directly subjected to filter pressing and dehydration, and rapid and efficient solid-liquid separation is achieved under the vacuum effect by adopting a ceramic filter press and utilizing a special microporous ceramic filter plate of the ceramic filter press. Furthermore, cyanide-containing wastewater is recycled and treated, and recycled water is used for washing and / or slurry preparation, so that the cyclic utilization of water resources is realized, the consumption of fresh water is reduced, and the production cost is reduced. By utilizing the belt conveyor with an accurate metering function, accurate control of the adding amount of the tailing filter cake is realized, and the consistency of the raw material proportion and the target value during subsequent stirring is ensured. Moreover, through automatic adjustment of online concentration monitoring and a central control system, real-time water supplementing adjustment can be achieved, it is ensured that the slurry concentration is always close to a set value, and therefore the uniformity and quality of filling materials are improved. In the filling process, the accuracy and the high efficiency of filling operation are ensured through the application of real-time monitoring and automatic control technologies.

The invention relates to the technical field of catalysts, and provides a catalyst and a preparation method thereof, and an application of the catalyst in carbon dioxide-based degradable plastics, the catalyst is a supported catalyst, and comprises a carrier and an active component; the carrier comprises ternary hydrotalcite, and the active component comprises double metal cyanide and a rare earth yttrium complex; the raw material of the double metal cyanide comprises a cyano coordination compound; the cyano coordination compound comprises potassium hexacyanomanganate and / or potassium hexacyanocobaltate. According to the technical scheme, the problems of low yield and more byproducts when the catalyst is used for catalyzing and preparing the carbon dioxide-based degradable plastic in the related technology are solved.

The invention belongs to the technical field of surface treatment, and particularly relates to a method for predicting the thickness of a cyanide-free electrogalvanizing coating. Comprising the following steps: step 1, preparing a cyanide-free electrogalvanizing solution; 2, cyanide-free electrogalvanizing test parameters are designed, and a test is conducted; 3, the thickness of a cyanide-free electrogalvanizing coating is obtained according to a cyanide-free electrogalvanizing test; step 4, establishing a cyanide-free electrogalvanizing coating thickness model; and 5, performing parameter optimization on the cyanide-free electrogalvanizing coating thickness model, thereby predicting the cyanide-free electrogalvanizing coating thickness according to the parameter-optimized cyanide-free electrogalvanizing coating thickness model.

The invention provides a cyanide generation and absorption efficiency monitoring method based on double-color indicator gradient change, and belongs to the technical field of cyanide monitoring, the absorption process is visually reflected through the double-color indicator gradient change, the absorption efficiency can be rapidly judged through color change without a complex instrument, the operation is simple and convenient, and the cost is low. And gradient color development and spectral analysis are combined, so that the detection limit can reach a mu g / L level, the trace detection requirement is met, and the absorption condition of the low-concentration cyanide can be accurately monitored. Through real-time change of the color gradient, the concentration distribution and the reaction process of the cyanide in the absorption process can be dynamically reflected, real-time data support is provided for industrial process control and environmental emergency monitoring, expensive detection equipment is not needed, the reagent cost is low, and the method is suitable for large-scale popularization and application.

The invention discloses a method for quantitatively testing the content of organic carbon and disseminated particle size in gold ore, and belongs to the technical field of gold ore detection. The method comprises the steps of sample preparation and quantitative testing, wherein palm wax serves as a cementing agent, barite serves as a standard sample, and a to-be-tested sample is prepared through melting, mixing, consolidation, polishing and carbon spraying; the quantitative test is based on an automatic process mineralogy test system, palm wax backgrounds are removed through backgrounds deduction, an energy spectrum library is established to recognize organic carbon and barite particles, the area ratio of the organic carbon and the barite particles is measured, the mass ratio is converted by combining the density ratio, the organic carbon content of raw ore is inversely calculated, and meanwhile, the particle size distribution of the organic carbon is counted. The method solves the problem that the content and granularity of organic carbon cannot be accurately quantified at the same time in the prior art, has the advantages of high test precision, high efficiency, comprehensive parameters and simplicity and convenience in operation, and can provide key data for optimization of a gold ore cyanidation leaching process.

The invention discloses a coking wastewater treatment system. The coking wastewater treatment system comprises a biochemical pretreatment system, a biochemical treatment system, a deep pretreatment system, a deep treatment system, a concentrated water treatment system, a matched dosing system and a sludge treatment system which are connected in sequence, the coking wastewater is used for blast furnace smelting slag flushing after being treated by the coking wastewater treatment system. According to the coking wastewater treatment system, a two-stage A / O process is adopted, meanwhile, an ozone advanced oxidation process is used for oxidizing part of pollutants and decolorizing a water body, the removal effect on COD, ammonia nitrogen, cyanide and other pollutants and chromaticity is enhanced, after ozone is decomposed, a decomposition product is oxygen, secondary pollution is not caused, and no sludge is generated. The coking wastewater treated by the treatment system disclosed by the invention meets the water standard for blast furnace slag flushing.

The invention discloses a high-voltage chloride solid electrolyte with a stable in-situ polyacrylonitrile flexible ion transmission interface layer and a preparation method and application thereof, and belongs to the technical field of solid electrolytes. According to the invention, an in-situ polymerization reaction is initiated by using polyvalent central metal ions contained in a specific chloride solid electrolyte to generate an electrophilic induction effect on a nitrile monomer, so that a uniform and complete polyacrylonitrile artificial organic flexible ionic conductor interface layer is formed on the surface of the chloride solid electrolyte; and the crystal structure and the ionic conductivity of the chloride solid electrolyte are not damaged. The lossless interface layer can effectively enhance the electrochemical stability of the solid electrolyte, can be matched with a high-voltage lithium ion positive electrode material, can enhance the air stability of the electrolyte and the mechanical stability of an electrode-electrolyte interface, and can remarkably inhibit the generation of pores and electrode cracks at the interface; the rate capability and the cycle life of the lithium ion solid-state battery are improved.

The invention discloses a phenol-cyanogen wastewater tail gas deodorization treatment process which comprises the following steps: firstly, intensively collecting tail gas through a system consisting of a sealing cover, a collecting pipeline and an induced draft fan aiming at normal-temperature odor containing ammonia gas, hydrogen sulfide and organic waste gas generated by structures such as an adjusting tank and a floatation tank in a phenol-cyanogen wastewater system of a coking plant; the chemical washing tower is used for removing alkaline substances and the like by using a phosphoric acid solution, the biological filter prewashing section is used for absorbing impurities and humidifying gas by using clear water, the biological section is used for degrading pollutants by using microorganisms, the activated carbon is used for adsorbing residual organic waste gas, and finally, the gas reaches the standard and is discharged through a chimney. The process can effectively reduce the concentration of each pollutant in the waste gas, improves the environment quality, provides treatment demonstration for the industry, and has remarkable environmental and economic benefits.

The invention provides a beneficiation method for copper-zinc associated gold ore, and relates to the field of beneficiation. The raw ore is subjected to pulping, copper, zinc and other floatable roughing, and copper, zinc and other floatable rough concentrate and copper, zinc and other floatable roughing tailings are obtained; performing copper separation roughing on the iso-floatable rough concentrate to obtain copper rough concentrate and separation roughing tailings, performing concentration on the copper rough concentrate to obtain copper concentrate, and performing scavenging on the separation roughing tailings to obtain zinc scavenging concentrate; zinc-sulfur mixed roughing is carried out on floatable roughing tailings such as copper and zinc to obtain zinc-sulfur roughing concentrate and zinc-sulfur roughing tailings, zinc-sulfur concentration is carried out on the zinc-sulfur roughing concentrate to obtain zinc-sulfur concentrate, zinc-sulfur separation roughing is carried out on the zinc scavenging concentrate and the zinc-sulfur concentrate to obtain zinc rough concentrate and sulfur rough concentrate, and scavenging is carried out on the sulfur rough concentrate to obtain sulfur concentrate; zinc concentration is carried out on the zinc rough concentrate to obtain gold-containing zinc concentrate, carbon leaching is carried out on the gold-containing zinc concentrate to obtain leached ore pulp and gold-loaded carbon, filter pressing is carried out on the leached ore pulp to obtain zinc concentrate and cyanogen-containing barren liquor, and the gold-loaded carbon is analyzed to obtain regenerated carbon and pregnant solution. According to the method, efficient comprehensive recovery of raw ore is achieved.

The invention discloses a method for reducing cyanide in the grain moistening process of Maotai-flavor liquor, and belongs to the technical field of liquor brewing. The brewing raw material sorghum is subjected to gamma-ray irradiation pretreatment, and an abscisic acid solution is applied for multiple times in the grain moistening step in the brewing process. According to the method, 60Co-gamma ray irradiation and abscisic acid solution treatment are combined, the content of cyanogenic glycoside in baijiu brewing is controlled from the source, the content of cyanogenic glycoside in baijiu is remarkably reduced on the premise of not changing indexes such as moisture, crude protein, crude fat, total ash content, amylose and reducing sugar related to the quality of sorghum, and the quality of the baijiu is improved. And 105221.56 [mu] g / kg of a blank control group is reduced to 1395.32 + / -164.29 [mu] g / kg.

The invention discloses a carbamoyl-substituted diarylethene derivative as well as a preparation method and application thereof, and the preparation method comprises the following steps: reacting R-substituted 3-bromo-2-hydroxybenzaldehyde with an arylmethyl triphenylphosphonium bromide compound or an aryl acetic acid compound to obtain an intermediate A; then the intermediate A and cuprous cyanide are subjected to a heating reaction in N, N-dimethylformamide and nitrogen atmosphere, and an intermediate B is obtained; and finally, heating the intermediate B, acetaldoxime and indium trichloride in toluene for reaction to obtain the carbamoyl-substituted diarylethene derivative. The carbamoyl-substituted diarylethene derivative disclosed by the invention has a remarkable effect in an in-vitro anti-tumor activity test, particularly has excellent anti-proliferation ability to human BRCA mutant tumor cells, and can be used for preparing medicines for treating PARP-1 activity abnormity related diseases. The synthesis route is simple, the cost is low, and large-scale implementation is facilitated.

The present invention provides a paroxysmal hemoglobinuria indication drug ipropam key intermediate synthesis method, and relates to the technical field of ipropam, the method comprises: taking p-bromobenzaldehyde as an initial raw material, adopting an S-configuration catalyst to obtain an intermediate 03, carrying out protection group removal on the intermediate 03, carrying out automatic ring closing to obtain an intermediate 04, and carrying out post-treatment to obtain the paroxysmal hemoglobinuria indication drug ipropam key intermediate. Reducing the intermediate 04 with sodium borohydride to obtain a single cis-configuration intermediate 05, then carrying out a chiral flip reaction and hydrolysis to remove p-nitrobenzoic acid, then carrying out an etherification reaction with diethyl sulfate to obtain an intermediate 08, reducing amide of the intermediate 08 with sodium borohydride and boron trifluoride diethyl etherate to obtain an intermediate 09, then carrying out an acetylation reaction to protect amino, and finally carrying out a reaction to obtain the chiral cis-configuration intermediate 03. Cuprous cyanide is subjected to a cyanation reaction and a hydrolytic esterification reaction to obtain the ipropam key intermediate TM. The method is low in raw material price, high in chiral control selectivity, easy in reaction condition control and low in equipment requirement, avoids column chromatography and other operations, and is more suitable for industrial production.

The invention provides a rapid detection method for cyanide in industrial wastewater, belongs to the technical field of wastewater detection, and solves the technical problems of non-uniform sampling, low detection accuracy and the like in the prior art. The rapid detection method for the cyanide in the industrial wastewater comprises the following steps: putting 2-(2-toluidine) and hydrochloric acid into a reaction kettle, stirring and mixing, and then feeding into a liquid storage tank of detection equipment for storage; the detection equipment is placed in a wastewater pool, a plurality of sampling assemblies of the detection equipment extend into the bottom of the wastewater pool, part of wastewater is separated in a closed space by the sampling assemblies, and then the wastewater is stirred and crushed; after stirring and crushing are completed, pumping part of wastewater into a detection box by using a water pump; the mixed liquid in the liquid storage tank is fed into the detection tank by using a quantitative liquid discharge mechanism and is mixed with the wastewater; and after standing for 2-5 minutes, observing the color of the liquid in the detection box. The method has the advantages that cyanide is uniformly distributed during sampling, and the detection accuracy is improved.

One form of the present invention provides a double metal cyanide catalyst having excellent catalytic activity and a preparation method thereof. Specifically, the double metal cyanide catalyst according to one form of the present invention is characterized in that it is prepared using a complexing agent comprising tertiary butanol, a linear or cyclic (C2-C12) aliphatic polyol, and a polyalkylene glycol.

The invention relates to the technical field of environmental analytical chemistry, and discloses a thymol phenolphthalein-TBPE double indicator-based cyanide titration detection method and system, and the method comprises the following steps: adjusting a water sample to be detected to an alkaline pH interval to construct a detection matrix; the method comprises the following steps: introducing a double-indicator system composed of thymol phenolphthalein and tetrabromo phenolphthalein ethyl ester according to a specific ratio into a detection matrix, and constructing a spectrum background for masking yellow interference of sulfide by utilizing the blue color development characteristic of thymol phenolphthalein; dropwise adding a silver nitrate standard solution into the mixed system to execute a complex reaction; according to the method, a spectrum background shielding field is constructed, chromaticity response of a system in a specific wave band is monitored in real time, and when a chromaticity mutation signal from green to bluish violet is captured, a titration end point is judged, and the cyanide concentration is calculated. High-precision anti-interference detection on cyanide in a complex high-turbidity matrix is realized, and the sensitivity and accuracy of end point recognition are improved.

The utility model discloses a low-cost device for treating high-concentration cyanide-containing wastewater, which comprises a first wastewater delivery pump (1), a primary reaction tank (4), a secondary reaction tank (6), a regulating tank (7) and a second wastewater delivery pump (8) which are sequentially connected, the primary reaction tank (4) is connected with a special cyanide breaking device (2) through a pipeline, and the regulating tank (7) is connected with a NaOH solution storage tank (3) through a pipeline. According to the method disclosed by the utility model, the oxidizing agent is prepared by adopting the special cyanide breaking device, the strong oxidizing property of the oxidizing agent is utilized, the cyanide breaking reaction is carried out on the high-concentration cyanide-containing wastewater treatment device, and the wastewater can stably reach the standard without adjusting the pH value of the wastewater on the basis of not changing the original treatment device.

High resiliency polyurethane foams are made by reacting a polyisocyanate with a mixture of polyols and water. The polyols include a cell opener. The cell opener is a random copolymer of 60 to 80 wt.-% ethylene oxide and correspondingly 40 to 20 wt.-% propylene oxide having a nominal functionality of 2 to 4 and a hydroxyl number of 25 to 50, wherein 50 to 75% of the hydroxyl groups of polyether polyol are primary hydroxyl groups, which is made using a modified double metal cyanide catalyst.

The invention discloses a method for enriching valuable elements by collaborative smelting of magnesium slag and desulfurized gold concentrate, which comprises the following steps: uniformly mixing desulfurized gold concentrate, magnesium slag and solvent powder, granulating and drying to obtain mixed granules; the mixed granules are added into a reduction furnace, a reducing agent is added for reduction smelting, and slag and precious iron alloy are obtained; the method comprises the following steps: crushing the precious iron alloy, and leaching to obtain leaching residues and a leaching solution 1; acid is added into the leaching residues for gold dissolving, leaching liquid 2 is obtained, then sodium sulfite is added into the leaching liquid 2, and gold powder is obtained; adding hydrochloric acid into the leachate 1 to obtain a silver chloride solid and a leachate 3; and heating and pressurizing the leachate 3, and adjusting the pH value to obtain the hematite-form precipitate. According to the method, calcium oxide, silicon oxide and magnesium oxide in the magnesium slag serve as slag formers for reduction smelting of the desulfurized gold concentrate in the high-temperature process, iron alloy is obtained through synergistic reduction smelting, meanwhile, valuable elements such as gold, silver and copper in raw materials are captured, the gold recovery rate is increased to 98% or above under the cyanidation-free condition, the silver recovery rate is increased to 95%, and the iron recovery rate reaches 92%.

The invention discloses a method for selectively dissolving precious metals based on a haloid aqueous solution, which comprises the following steps: dispersing a to-be-dissolved precious metal-containing material into an aqueous solution containing haloid and potassium peroxymonosulfate (PMS), stirring to react for a certain time without adding a catalyst, and dissolving the precious metals in the material. The method for green recovery of precious metals from electronic wastes has the advantages of mild process, energy saving, environmental protection, low cost, convenient operation and the like, does not use strong acids, toxic cyanides and volatile organic solvents in the whole reaction process, has huge potential in the fields of environmental protection, resource reutilization and the like, and is suitable for industrial production. And a great contribution can be made to transition to low-carbon environment-friendly and resource-saving green economy.

The invention relates to the technical field of chemical catalysis, in particular to a polyether polymerization catalyst which comprises the following components: double metal cyanide (DMC) of which the average particle size is 20-50nm, a cocatalyst of which the addition amount is 3-5% of the total mass of the catalyst, a Lewis acid-alkali pair catalyst of which the addition amount is 3-5% of the total mass of the catalyst, and a dispersing aid of which the addition amount is 1-2% of the total mass of the catalyst, the preparation method comprises the following steps: preparing a granular catalyst suitable for an industrial scale through a spray drying molding technology, improving the catalytic efficiency by 20% or more and reducing side reactions by 30% or more under the condition of 60-80 DEG C, and the generated polyether has narrow molecular weight distribution (PDilt, PDIt, PDIt, PDIt, PDIt, PDIt, PDIt, PDIt, PDIt, PDIt, PDIt, PDIt, PDIt, PDIt, PDIt and PDIt); 1.2) and a low degree of unsaturation (lt; the quality of the product is obviously improved, and the product is suitable for high-end application of polyurethane, lubricating oil and green chemicals.

The invention discloses a rare earth element doping modification process of an optical module electroplated layer, which belongs to the technical field of optical module manufacturing, and comprises the following steps: sequentially carrying out oil removal, acid pickling and activation treatment on an optical module matrix to form a clean active surface; the preparation method comprises the following steps: taking nickel aminosulfonate or potassium gold cyanide as main salt, adding 0.5-5g / L of rare earth salt which is at least one of cerium chloride, lanthanum nitrate or yttrium sulfate, and adding 5-15g / L of sodium citrate complexing agent and lauryl sodium sulfate surfactant; under the conditions that the pH is 3.5-4.5 and the temperature is 45-55 DEG C, pulse current with the density being 2-5 A / dm < 2 > is adopted for electroplating, the pulse frequency is 100-500 Hz, and the duty ratio is 30-50%; when electroplating deposition is carried out, hydrogen bubbles on the outer side of the optical module are removed through a hydrogen removal device, the hydrogen bubbles are prevented from being attached to the surface of a cathode, and the uniformity of codeposition of rare earth and metal is ensured; and after electroplating is completed, deionized water cleaning and vacuum drying are carried out on the optical module. The high temperature resistance of the surface of the optical module obtained through the technology is improved.