869 results about "Arsenic" patented technology

A method for recovering heavy metals and soluble chlorine salts from fly ash generated by incineration of domestic waste. The method comprises the following steps: first, mixing fly ash with water and an acid, performing a leaching reaction when a pH value is controlled, improving the leaching efficiency of lead and zinc by means of air agitation, and measuring dissolved oxygen or redox potential to determine a leaching reaction endpoint; second, using a vulcanizing agent to recover leached heavy metals, and adjusting and monitoring the pH value of a leachate so as to control the adding amount of the vulcanizing agent; third, adding an alkali to adjust the pH value of the leachate so as to precipitate impurities such as aluminum and iron, and using an excessive amount of the vulcanizing agent to further remove heavy metals; and finally, adding an oxidizing agent and an iron salt coagulant into the leachate from which the heavy metals and impurities are removed, so as to remove divalent sulfur and arsenic, wherein the finally purified leachate can be used for recovering soluble chlorine salts. The method has a simple and efficient process, can significantly increase the recovery rate of heavy metals, and recovers heavy metals in the form of metal sulfides, thus facilitating subsequent separation treatment. The treated fly ash can be used as a raw material of cement, thus achieving efficient utilization of resources.

The invention discloses a smelting wastewater trace arsenic real-time monitoring method based on an electrochemical sensing array, and relates to the technical field of electrochemical detection.The method comprises the steps that bypass sample flow is established through a peristaltic pump and pre-filtered, and stable sample flow is obtained; the sample flow is divided into a first passage and a second passage, and a form distinguishing sample flow is obtained after oxidation setting and medium equalization; performing short-time adsorption equilibrium to obtain an interface state parameter set, executing multi-segment coded deposition control based on the parameter set, and collecting a dissolution current curve; a dissolution signal set is obtained by applying single-frequency perturbation signals, characteristic peak parameters are extracted and subjected to correlation calculation with a multi-section response matrix, the total arsenic concentration and the pentavalent arsenic concentration are calculated through a weighted inversion algorithm, and a confidence interval is obtained; and calculating the concentration of the trivalent arsenic and determining an uncertainty range according to the two. According to the method, the quality judgment result is linked with the dynamic adjustment of the sampling flow, the potential amplitude and the deposition duration, so that the self-adaptive optimization control of the detection process is realized.

The invention discloses a method for recovering metal from high-nickel copper fire refining slag and application of the method, and relates to the technical field of metal metallurgy. Comprising the following steps: carrying out weak acid arsenic leaching on the copper fire refining slag to obtain arsenic-removed leaching slag and arsenic-containing copper liquid; copper removal is carried out on the arsenic-containing copper liquid to obtain a copper-containing material and copper-removed liquid, and arsenic precipitation is carried out on the copper-removed liquid; the arsenic-removed leaching residues are subjected to oxidation copper leaching to obtain copper leaching residues and a copper sulfate solution, and the copper leaching residues are subjected to reduction vulcanization smelting to obtain nickel matte, tin-antimony smoke dust and smelting residues. According to the method, the cost of separation of copper and arsenic in the raw materials can be reduced, the problem of furnace caking caused in the reduction smelting process is avoided, the obtained copper sulfate solution serves as electrolyte replenishing liquid to be applied to the copper electrolysis process, and the influence on the self-purification process of electrolyte is small. According to the method, nickel and copper are enriched in matte nickel through reduction vulcanization smelting, then copper-nickel separation is conducted through the post-treatment process, the post-treatment process is shorter, nickel recovery is achieved while copper recovery is guaranteed, and better economic benefits are achieved.

The invention relates to the technical field of acidic wastewater titrimetric analysis, and discloses an automatic sampling titrimetric analysis method based on a copper smelting acidic wastewater treatment link, which comprises the following steps: collecting waste acid to obtain a waste acid sample; carrying out titration treatment on the waste acid sample to obtain a waste acid sample image after the titration reaction is finished, and carrying out sediment outline extraction on the waste acid sample image to generate sediment coagulation complexity; according to the method, automatic sampling titration is combined with image analysis, precipitation coagulation complexity and arsenic specific hue separation degree are extracted, a precipitation effectiveness index and an arsenic residue risk coefficient are generated through dynamic fusion, arsenic precipitates and other precipitates in similar forms are accurately distinguished by utilizing precipitate contour features and arsenic specific hue in an HSV color space, and the arsenic content is accurately determined. The method has the advantages that spectral signal superposition interference is avoided, and the arsenic residual state can be accurately reflected, so that whether arsenic removal is qualified or not is reliably judged, the accuracy and safety of waste acid treatment are improved, and the quality of water reuse is guaranteed.

The invention discloses a step-by-step removal method for thallium and arsenic in lead-zinc smelting waste acid, which comprises the following steps: adding a calcium-containing precipitant into the lead-zinc smelting waste acid for neutralization and precipitation to obtain a neutralization and precipitation filtrate and a neutralization and precipitation filter residue; adding a calcium remover into the neutralized and precipitated filtrate to carry out calcium removal reaction to obtain calcium-removed filtrate and calcium-removed slag; adding an oxidizing agent I and a catalyst into the calcium-removed filtrate, controlling the pH value of the oxidation process to be 9.0-11.5 by using alkali liquor, carrying out selective oxidation thallium removal, and filtering to obtain thallium-removed filtrate and thallium-removed slag; and adding iron salt into the thallium-removed filtrate for deep arsenic removal to obtain effluent and arsenic-removed slag. According to the method, thallium and arsenic in the contaminated acid can be removed step by step, so that the concentration of arsenic and thallium in effluent stably reaches the standard for a long time while thallium slag and arsenic slag are separated.

The invention belongs to the technical field of metallurgy, and particularly relates to a method for recovering valuable metals from smelting electric dust. The method comprises the following steps: S1, adding sulfuric acid, ferric sulfate and hydrogen peroxide into the smelting electric dust, and after reaction, carrying out solid-liquid separation to obtain an acidic leaching solution and acidic leaching residues; s2, sodium hydroxide is added into the acid leaching residues obtained in the step S1, the pH value of the acid leaching residues is adjusted to 13.5 or above, and alkaline leaching liquid and alkaline leaching residues are obtained after reaction; s3, sulfuric acid is added into the alkaline leachate obtained in the step S2, the pH value of the alkaline leachate is adjusted to 10.0-12.5, and neutralization liquid and lead slag are obtained after reaction; and S4, roasting the lead slag obtained in the step S3 to obtain lead oxide. According to the method, ferric sulfate is added in the acid leaching process of the smelting electric dust, leaching of arsenic can be effectively inhibited, and efficient separation and recovery of valuable metal can be effectively achieved by subsequently changing the acid-base environment of the reaction.

The present application belongs to the technical field of gaseous arsenic adsorption, and particularly relates to a sulfur-tolerant gaseous arsenic adsorption material, a preparation method and application thereof. Manganese oxide and an iron source are mixed and placed in a ball mill jar, then the ball mill jar is sealed, argon is filled into the jar, and the iron-modified manganese oxide adsorption material is obtained by ball milling. The addition of iron improves the sulfur tolerance of manganese oxide, so that the adsorbent still has high gaseous arsenic adsorption capacity under high-concentration SO2 conditions, and is suitable for the removal of gaseous arsenic in typical high-SO2 flue gas, i.e. non-ferrous smelting flue gas. The preparation method is simple, the cost is low, the gaseous arsenic adsorption capacity is large, and the present application has a wide application prospect.

The invention discloses a composition for deeply removing trivalent arsenic in wastewater from an iron-based mineral aggregate and application of the composition. The composition comprises an iron-oxidizing bacteria solution and an iron-based mineral aggregate, the iron-based mineral aggregate comprises red mud and pyrite, and the mass ratio of the red mud to the pyrite is 1: (0.9-1.1). When the composition is used for deeply removing trivalent arsenic in wastewater, the process comprises the following steps: culturing iron-oxidizing bacteria to a logarithmic phase, centrifuging, washing and resuspending to obtain an iron-oxidizing bacteria solution; the method comprises the following steps: adding a composition containing an iron-oxidizing bacteria solution and an iron-based mineral aggregate into wastewater containing trivalent arsenic to carry out arsenic removal reaction, and separating after the reaction is finished. According to the composition, the synergistic effect of all the components is utilized, the oxidation-adsorption-precipitation process of trivalent arsenic in wastewater is achieved through a one-step method, no strong oxidizing agent needs to be added for pre-oxidation treatment, especially when the arsenic concentration in the wastewater is 20-200 mg / L, the excellent removal effect is achieved, and the trivalent arsenic removal efficiency can reach 90%.

The present invention relates to layered multi-metal-oxide-based magnetic biochar and a preparation method and use thereof. The preparation method includes: S1. mixing biomass and an iron salt solution for impregnation, and then adjusting a first pH value of a solid phase material after solid-liquid separation to obtain pretreated biomass; and S2. pyrolyzing the pretreated biomass to obtain magnetic biochar, then mixing the magnetic biochar with a solution containing at least two metal salts and adjusting a second pH value, and then performing hydrothermal treatment to obtain the layered multi-metal-oxide-based magnetic biochar. The obtained layered multi-metal-oxide-based magnetic biochar has a large specific surface area, magnetic properties, a layered morphology, and strong adsorption capacity, and can be applied to the treatment of arsenic- and cadmium-containing composite contaminated water bodies, and also to arsenic and cadmium passivation in farmland soil, thereby reducing health risks of crops in the food chains, and ensuring food safety.

A method of producing a carbonate bonded article includes preparing a reactive mixture having a particulate mineral source and an aqueous source, and reacting the reactive mixture with carbon dioxide to form a mineral matrix including carbonates. The particulate mineral source includes a leachable compound, the leachable compound including one or more elements selected from: As, Ba, Cd, Cr, Co, Cu, F, Hg, Mo, Mn, Ni, Pb, Sb, Se, V, and Zn. The reactive mixture includes a reducing agent, where the reducing agent includes one or more of a sulfide, disulfide, and polysulfide compound that reacts with the particulate mineral source. The pH of the reactive mixture is at least 10.

The present invention provides a soil conditioner and a preparation method and application thereof, belonging to the technical field of soil conditioners. The soil conditioner of the present invention comprises the following raw materials in parts by weight: 70 to 90 parts of modified pig manure biochar, 8 to 15 parts of polyaspartic acid, 5 to 10 parts of potassium titanium oxalate, 1 to 3 parts of ammonium molybdate, 40 to 60 parts of calcium silicate, and 20 to 30 parts of lime. The present invention uses a mixed modifier to modify pig manure biochar, which can greatly reduce the content of cadmium and arsenic in edible parts. In addition, the raw materials in the soil conditioner cooperate with each other to reduce the content of heavy metals in the edible parts to the greatest extent.

The invention discloses a method for reducing the grade of lead in crude bismuth. The method comprises the following steps: 1) melting the crude bismuth; 2) oxidizing and refining to remove arsenic and antimony; 3) adding alkali to remove tellurium; and 4) removing lead by using quartz sand, namely controlling the temperature of the bismuth pot to be 350-400 DEG C, introducing compressed air, positively and negatively stirring for 8-9 hours in different directions by using a stirrer, adding the quartz sand while stirring to enable the generated lead silicate to float on the surface, and removing slag manually to obtain the lead-removed bismuth. According to the method, no waste gas is produced in the lead removal process, the field operation environment is friendly, the energy consumption is greatly reduced, and the lead removal cost is greatly reduced; according to the method, quartz sand is adopted to remove lead, and a proper reaction temperature is matched, so that not only can the formation of lead silicate be effectively promoted, but also the formation of bismuth silicate can be effectively inhibited, further the lead removal effect can be effectively improved, the lead grade is reduced, and the bismuth grade is improved; the quartz sand is not easy to decompose in the reaction process, the utilization rate of the quartz sand is high, the cost of removing lead from crude bismuth is reduced, and the method is suitable for large-scale production.

The invention belongs to the technical field of heavy metal treatment, and particularly relates to a synthesis method and application of a sludge biochar Schwertmannite composite material capable of synchronously mineralizing cadmium and arsenic. Municipal or industrial sludge is used as a raw material, sludge biochar rich in Ca, Fe and alkaline functional groups is prepared through pyrolysis, then the sludge biochar is deeply compounded with Schwertmannite through a high-energy ball milling technology, a core-shell-like nested structure is formed through induction, and a large number of reaction sites are exposed. Under the condition that As / Cd coexists, the surface of the composite material can be induced to generate stable minerals, a synchronous precipitation mechanism is formed, and As and Cd have an adsorption synergistic enhancement effect. The process is wide in raw material source, clean and efficient in preparation process and free of high-temperature hydrothermal or organic reagents, has cation exchangeability, alkali energy storage and carbon immobilization value, provides a new theory and material support for long-term environment immobilization of multi-metal pollutants, and has large-scale application potential.

The invention discloses a pretreatment method and system for sulfur-containing and arsenic-containing ore. The method comprises the steps of crushing, alkaline wet ore grinding, strong alkaline pre-oxidation, cyanidation leaching, cyanogen removal treatment and high alkaline flotation. In the pretreatment process, liquid caustic soda is added into an ore grinding system, and oxygen is introduced into a cyanidation serial stirring tank for pre-oxidation treatment, so that the oxidation activation effect of the arsenic-sulfur minerals is remarkably enhanced, and the gold release efficiency and the cyanidation leaching rate are improved. The same group of serially connected stirring tanks is adopted for pre-oxidation and cyanidation leaching, and the first three stirring tanks are used for pre-oxidation and subsequently communicated with the stirring tanks for cyanidation reaction, so that process integration and equipment reuse are realized. Experimental results show that the comprehensive recovery rate of gold can be remarkably increased, the agent consumption can be reduced, and the method has good industrial application value.

The invention relates to the technical field of industrial wastewater pollution treatment, in particular to a graded recovery method for copper and arsenic in wastewater. According to the method, the copper ions and the trivalent arsenic ions in the wastewater are respectively recovered by adopting sodium hydrosulfite under the condition of different pH values, so that the elementary substance copper and the elementary substance arsenic are obtained. According to the method, efficient graded recovery of copper and arsenic can be realized without introducing excessive substances; the treated wastewater can also reach the discharge standard, so that the effective treatment of the wastewater is realized; the method is simple to operate, high in efficiency, low in cost and wide in applicability.

The invention discloses an iron-based layered silicate material for efficiently removing variable-valence heavy metals and water treatment application of the iron-based layered silicate material, and belongs to the technical field of water treatment.The preparation method of iron-containing layered silicate minerals comprises the following steps that ferrous sulfate heptahydrate is dissolved in water, sodium dithionite and sodium orthosilicate are sequentially added, stirring is conducted, and a mixture is obtained; stirring, homogenizing and aging for two hours; the hydrothermal reaction kettle is used for reacting in a high-temperature and high-pressure environment; according to the iron-containing layered silicate mineral material, a unique layered structure similar to natural iron-containing layered silicate minerals and high adsorption performance are reserved, variable-valence heavy metal arsenic in a wastewater solution is synergistically and efficiently removed by means of the oxidation-reduction activity of the iron-containing layered silicate mineral material and induction of generation of Fenton-like reaction, and the iron-containing layered silicate mineral material is obtained. The method disclosed by the invention shows high treatment efficiency, environmental friendliness and remarkable economic benefits, and is expected to exert remarkable environmental benefits in the field of water treatment.

The invention discloses a method for resourceful treatment of heavy metal gypsum sludge and secondary zinc oxide smoke dust, and belongs to the technical field of solid waste resourceful utilization. Grinding and mixing the heavy metal gypsum sludge, the secondary zinc oxide smoke dust and a carbonaceous reducing agent, and roasting to obtain a roasted material containing ZnS and CaO; the roasted material is leached through hydrochloric acid, and zinc sulfide enriched slag and leachate are obtained; according to the method, the volatilization rates of toxic elements fluorine, chlorine and arsenic in the solid waste raw materials reach 97.22%, 97.28% and 98.41% respectively, the vulcanization rate of zinc reaches 96.89%, the recovery rates of zinc sulfide and calcium oxide can reach 98% or above, and the technical problems that a vulcanizing agent needs to be added in the vulcanization roasting process, and the recovery rate of valuable metal is low are solved.

The invention belongs to the technical field of hydrometallurgy, and particularly relates to a pretreatment method for enhancing peroxide to improve the leaching rate of high-sulfur-arsenic gold ore. Comprising the following steps that the high-sulfur-arsenic gold ore is ground and then prepared into ore pulp; an oxidizing agent is added into the ore pulp, oxidation pretreatment is conducted on the high-sulfur-arsenic gold ore under the catalytic action of ultraviolet light, and ore pulp activation liquid is formed; and the pH of the ore pulp activating solution is adjusted to 9-12, a gold leaching agent is added into the ore pulp complexing solution, and stirring gold leaching treatment is conducted. According to the method, efficient oxidation of sulfide and arsenide is achieved under the mild condition through the synergistic effect of photocatalysis and chemical oxidation, the leaching rate of gold is remarkably increased, compared with a conventional peroxide oxidation method for pretreatment, the leaching rate can be increased by 10%-35%, and meanwhile the agent use amount and environmental pollution are reduced.

The present invention relates to the field of sludge treatment technology, and more specifically, to a method for solidifying arsenic in high-arsenic sludge using clay and copper slag. The method involves drying the high-arsenic sludge at 105°C for 12 hours and grinding it to a particle size of less than 0.5 mm to obtain a dry material. The dry material is then mixed evenly with clay powder, copper slag, and coal powder. Water is then added, stirred at room temperature for a pre-reaction of 6 hours, and poured into a crucible to obtain a paste-like mixture A. The dry mixture A is then calcined at 850-900°C for 20-40 minutes under a protective atmosphere. The reaction product, after natural cooling, is then used as a roadbed material, for example. This method utilizes clay and copper slag calcination to treat high-arsenic sludge, resulting in low arsenic and other heavy metal leaching toxicity and excellent stability, while also fully utilizing metallurgical solid waste.

The invention belongs to the technical field of gold smelting wastewater treatment and resource utilization, and relates to a method for recycling gold by cooperatively treating tailings with acid wastewater, which comprises the following steps of: (1) concentrating the acid wastewater; (2) controlling the fineness of the roasting cyanidation gold extraction tailings; (3) removing impurities by acid; (4) adsorbing and recovering gold and silver by using thiourea leaching carbon; and (5) vulcanizing the acidolysis solution to recover copper and arsenic in a targeted manner. According to the method, efficient treatment is carried out through a five-stage treatment process, so that sulfuric acid in the acid wastewater is efficiently recycled, the roasting and cyaniding gold extraction tailings are comprehensively and efficiently utilized, resource high-value utilization and clean production of the acid wastewater and the roasting and cyaniding gold extraction tailings are achieved, and harm of the acid wastewater and the roasting and cyaniding gold extraction tailings to the environment is eliminated; the technological process is smooth, operability is high, the environment is excellent, and remarkable economic benefits, social benefits and environmental benefits are achieved.

The invention provides a method for comprehensively recovering valuable metals from liquid purified by an antimony-based adsorbent, and belongs to the field of hydrometallurgy. The method comprises the following steps: (1) primary electrodeposition copper removal; (2) primary purification and impurity removal; (3) secondary electrodeposition copper removal; (4) secondary purification and impurity removal; (5) diffusion dialysis; (6) neutralizing to remove iron; (7) nickel precipitation by oxalic acid; and (8) roasting to obtain the high-purity nickel oxide powder. The treated object is the copper electrolyte subjected to purification and impurity removal through the antimony-based adsorbent, and the content of arsenic, antimony and bismuth impurities is remarkably reduced. By means of the method, it can be guaranteed that the quality of electric copper reaches the A-level copper standard, meanwhile, generation of highly toxic H3As gas is avoided, the comprehensive utilization efficiency of valuable metal resources in purified liquid is high, and the method is suitable for industrial application of copper electrolyte purification.

The invention discloses a preparation method and application of an iron-manganese modified biochar material for remediation of cadmium and arsenic contaminated soil, and relates to the field of new materials.According to the material, rice hull biochar serves as a carrier, and the specific surface area and surface active sites are increased through programmed intermittent ball milling; and the Fe-O / Mn-O bonding modification complex is formed through gradient loading of iron and manganese oxides. The maximum adsorption capacity of the material to Cd < 2 + > and As (V) reaches 71.54 mg.g <-1 > and 49.30 mg.g <-1 > and is 1.65 / 2.53 times that of original biochar, the content of available Cd and As in soil is reduced by 8.98% and 25.2% under the condition that the addition amount is 0.4%, and the passivation efficiency is improved by 1.05 times (Cd) and 9.08 times (As) compared with that of non-ball-milled iron-manganese modified biochar; the material prepared by the method is applied to cadmium and arsenic polluted soil, pollution can be controlled by waste, and the soil can be effectively repaired.

The present application belongs to the technical field of rare metal metallurgy, and particularly relates to a method and device for removing arsenic in germanium tetrachloride by hydrogen peroxide oxidation. The arsenic removal device comprises GeCl4, H2O2 and HCl storage containers, the storage containers are connected with a first reactor and a second reactor through pipelines, fourth, fifth, sixth, seventh and eighth valves are arranged on the pipelines, a first constant temperature heater is arranged at the lower part of the first reactor, a first mechanical stirrer is arranged at the top of the first reactor, a first residual liquid collector is connected with the bottom of the first reactor through a pipeline, and ninth and eleventh valves are arranged between the first reactor and the first residual liquid collector. Compared with the traditional chlorine arsenic removal method, the present application uses hydrogen peroxide to remove arsenic in germanium tetrachloride, is more environmentally friendly, safe, low-cost and does not bring new impurity elements, and the arsenic removal effect is very significant.

The invention relates to the technical field of geological exploration, in particular to an X-ray fluorescence spectrometer and geological radar combined gold vein rapid positioning method, which comprises the following steps: S1, arranging an exploration survey line in a pre-selected exploration area; s2, along the same measuring line, measuring the content of the gold mineralization indication element in the earth surface or the shallow medium by using an X-ray fluorescence spectrometer, synchronously recording the position information of a measuring point, and generating element content spatial distribution data; the gold mineralization indicating element comprises at least one of arsenic As, antimony Sb and mercury Hg; s3, carrying out detection by using a geological radar along the same measuring line, obtaining a reflected wave signal of an underground medium, synchronously recording position information of a detection point, identifying fault zone and joint zone geological structure anomalous bodies through data processing, and generating geological radar space distribution data; through XRF and GPR data fusion, a CAI quantitative model is established to precisely delineate an ore prospecting target area, a hidden ore body is effectively identified, the exploration precision and efficiency are greatly improved, and the exploration cost is reduced.

The invention discloses an efficient and energy-saving purification method for a copper electrolyte. The purification method comprises the following steps: performing MVR (Mechanical Vapor Recompression) concentration; cooling and crystallizing; filtering and separating; electrodeposition copper and impurity removal by a circulation method; freezing and crystallizing; performing centrifugal separation; according to the method, in the MVR concentration process, a high-energy-efficiency steam compressor is used for compressing secondary steam generated by evaporation of the copper electrolyte, the enthalpy of the secondary steam is improved, and the secondary steam with improved heat energy is pumped into a plate heat exchanger to exchange heat with the copper electrolyte, so that the existing heat energy of the secondary steam is recycled; therefore, the consumption of external steam can be reduced to realize evaporation and concentration of the copper electrolyte to produce crude copper sulfate; in the circulation method electrodeposition copper removal and impurity removal process, the crystallization mother liquor is supplemented into the impurity removal circulation liquid, so that copper ions can be kept in an efficient impurity removal concentration range, and the removal efficiency of impurities such as arsenic is improved; a refrigerator is adopted to cool the electrolyte after electrodeposition copper removal and impurity removal, and then a centrifugal machine is adopted to realize solid-liquid separation of nickel sulfate crystals.

The invention discloses a method for predicting spatial distribution of heavy metal arsenic in soil based on Bayesian maximum entropy, and relates to a method for predicting spatial distribution of heavy metal arsenic in soil based on multi-source environment variables and a Bayesian maximum entropy-geographically weighted regression-common Kriging model. According to the method, multi-source environment variables such as terrains, natural conditions and remote sensing images are combined, uncertainty of soft and hard data is integrated by using a BME model, and prediction precision is improved; processing a spatial heterogeneity relationship between variables through a GWR model; and optimizing local interpolation by using an OK model. According to the method, the precision of heavy metal arsenic distribution prediction is remarkably improved, meanwhile, the regional soil heavy metal pollution spatial distribution diagram can be drawn, and a scientific basis is provided for soil environment risk assessment and pollution abatement.

A light emitting device comprising a germanium first layer; a nucleation layer; a buffer layer comprising a III-V composition; and an active layer. The sum product of As concentration and layer thickness in each of the layers is less than 20%. This enables the devices to be fabricated in an environment which must be free, or substantially free, of arsenic.

The invention provides a method for preferentially extracting gold and silver from lead anode slime, and relates to the technical field of precious metal recovery, firstly, silver, antimony and other valuable metals in the lead anode slime are leached into a solution through catalytic oxidation leaching in the presence of a protective agent, and gold is enriched in residues; then, silver is selectively precipitated from the leachate, and silver precipitation residues and a valuable metal solution are obtained; and finally, valuable metals in the solution are recovered by adding a neutralizer and a precipitator, the obtained leaching mother liquor can be returned for leaching after being supplemented with hydrochloric acid, and the valuable metal precipitates are used for recovering antimony and bismuth. The method changes the traditional lead anode slime treatment thinking of first impurity removal and second refining, has the characteristics of high gold and silver direct recovery rate (greater than 99.5%), high reaction speed (total consumed time is less than 1 h), low cost and no generation of waste residue and wastewater, and is expected to solve the problems of long gold and silver recovery process, low direct recovery rate, capital overstock and difficult treatment of arsenic and antimony-containing smoke in the existing lead anode slime treatment method. The method has remarkable economic and environmental benefits and a good application prospect.

The invention discloses a novel process for separating tin and lead from low-grade tin-lead-zinc smoke dust produced by a fuming furnace. Low-grade tin-lead-zinc smoke dust produced by treating a low-tin material through a fuming furnace vulcanization volatilization method is used as a raw material, and the method comprises the processes of impurity removal and dezincification, desulfurization by adding a desulfurizing agent, desulfurization and dearsenification by roasting, reduction and precipitation of crude lead, strong reduction smelting treatment in an electric furnace and the like. The invention provides a novel smelting process aiming at a low-grade tin high-lead zinc smoke dust raw material produced by a low-tin material treated by a fuming furnace vulcanization volatilization method, so that the energy consumption cost is greatly reduced, the lead is thoroughly removed, the lead and tin separation effect is good, the technical and economic indexes are further improved, and the smelting efficiency and the economic benefits are improved.

The invention relates to the technical field of environmental protection, in particular to an arsenic and selenium online removal system and method for a waste incineration power plant. In the working process, the system obtains fly ash on line from a dust remover of a waste incineration power plant, the fly ash is modified through the on-site chemical and ball-milling integrated modification device to prepare an efficient arsenic-selenium adsorbent, and then the efficient arsenic-selenium adsorbent is conveyed and sprayed into a flue to adsorb pollutants such as arsenic and selenium in flue gas. The adsorbent raw materials are obtained on site in the waste incineration power plant, online modification and further injection adsorption can reduce emission of pollutants such as arsenic and selenium to the atmosphere, the situation that the adsorbent raw materials are obtained from the outside of the waste incineration power plant is avoided, the pollutant control cost is reduced, and the automatic operation level is improved. Namely, the system can realize integrated operation of on-site feeding, modification, injection and adsorption, and can meet the requirement of adsorbing and removing discharged pollutants such as arsenic and selenium in flue gas of coal-fired power plants of units with different capacities.