34results about How to "Realize enrichment recovery" patented technology

The invention provides a method for treating dust containing zinc and iron through cooperation of a blast furnace and a rotary kiln. According to the method, the rotary kiln is used and cooperates with the blast furnace; and the dust containing zinc and iron is treated by an open-loop circulation mode. The rotary kiln is used for taking the dust containing zinc and iron of the blast furnace as a main raw material and preparing zinc-containing dust particles through processes of mixing, granulating, drying and preheating; hot air used in the drying process is from hot air obtained by high-temperature flue gas of the rotary kiln through heat exchange equipment; then the dried zinc-containing dust particles are added into the rotary kiln and are reduced and roasted at high temperature; the reduced metal zinc is volatilized at the temperature about 907 DEG C and is changed into zinc vapor; the zinc vapor leaves the rotary kiln along with the flue gas; zinc oxide is formed in a recycling system, so that zinc can be enriched and recycled; high-temperature dust particles after dezincification are instantly changed into directly reduced iron; then the directly reduced iron is prepared intodezincification hot-pressing blocks through a hot block pressing process; the dezincification hot-pressing blocks are returned to an iron recycling system and then enter the blast furnace for high-temperature melting treatment; and the metal iron can be fully recycled.

The invention belongs to the field of chelate resin materials and provides a salicyhydroximic acid type chelate resin and a preparation method thereof for solving the problem that the existing hydroximic acid can not be repeatedly used in sewage treatment. The preparation method comprises that a ligand salicyhydroximic acid is bonded to the surface of a chloromethylated polystyrene microsphere to obtain the salicyhydroximic acid type chelate resin, and bonding quantity of the ligand salicyhydroximic acid is 0.38-0.43g/g. The salicyhydroximic acid type chelate resin has strong coordination complexing power to metal ions, can realize enrichment recycling of multiple precious metal ions, especially has excellent adsorbability and selectivity to heavy metal ions such as copper, nickel, lead, iron, zinc and chromium and can be effectively applied to treatment of sewage in the industries such as electroplating, electronics and heavy metals and extraction of rare earth minerals; besides, the bonding quantity of salicyhydroximic acid is high, a synthetic process is simple, conditions are mild, time is short, and synthesis is easy to control; and the chelate resin provided by the invention is convenient to use and easy to separate and recycle and can be recycled for 10 times while the adsorbability is basically constant.

The invention discloses a method for enriching and recovering thallium from a lead smelting system. The method comprises the following steps of: collecting thallium-cadmium soot from a lead concentrate smelting system; leaching the obtained thallium-cadmium soot in water or dilute sulfuric acid, and collecting a leaching solution; carrying out primary replacement and secondary replacement on the collected leaching solution by using a metal monomer; carrying out standing oxidation on thallium-containing sponge cadmium obtained after secondary replacement, leaching by using a sodium carbonate solution after oxidation, and obtaining a thallium-rich leaching solution after leaching; and adjusting the pH value of the obtained thallium-rich leaching solution, and then carrying out replacement toobtain sponge thallium, thereby completing the enrichment of thallium. According to the method for enriching and recovering thallium from the lead smelting system, thallium in the lead concentrate smelting system is well enriched and recovered by using a simple and easy-to-operate method, no toxic or harmful reagent is used in the whole treatment process, the used reagent is non-toxic and low incost, the materials in the whole treatment process are well recycled and recovered, no waste is generated, and the production cost is further reduced. Moreover, thallium is well enriched and recovered. The method has outstanding social and economic benefits.

The invention provides a method for reduction and detoxification of stainless steel acid pickling sludge, and belongs to the field of metallurgy and environmental protection. The method comprises the following steps that 1, after the stainless steel acid pickling sludge is produced, water can be reduced to 50% after stockpiling and natural drying; 2, the sludge, coke and an adhesive are added into a vertical curing furnace after batching, mixing and pelleting, meanwhile, a proper amount of air is blown in for high-temperature reducing roasting curing, reduction is achieved through the water reduced by 50%, Cr6+ is reduced, decomposed and converted into Cr3+, thorough detoxification is carried out, and a nichrome basic material is obtained and conveyed to a smelting plant for producing nichrome; and 3, smoke generated in the roasting process is subjected to bag dedusting and then is discharged after wet desulphurization and defluorination are carried out to meet the standard, and a small quantity of desulphurization and defluorination byproducts are used as common solid waste to be used as backfill materials of building roadbeds and the like or abandoned. Reduction, detoxification and efficient resource recycling of the stainless steel acid pickling sludge are achieved, and remarkable economic, environmental and social benefits are achieved.

The invention discloses a method for copper slag tailings pulp smoke desulfurization cooperating with copper resource efficient recovery. Copper slag tailings are adopted as a smoke desulfurizer. Firstly, the slag tailings and water are added into a pulp mixing tank according to a ratio, stirring and mixing are conducted, the mixture is evenly added into a desulfurization tower, smoke reacts withan absorbent through the desulfurization tower, Fe and Cu leached out from pulp liquid can significantly promote the smoke desulfurization effect, the purified smoke is discharged through a chimney, and acid desulfurization liquid is introduced into a zinc production section. Pulp liquid entering a zinc sulfate or electrolytic zinc purification section can be subjected to iron precipitation undercertain pH through iron leached out from the slag tailings, afterwards, cadmium is removed through replacement, zinc sulfate is prepared with copper, and copper can be recovered from filter residues.According to the method, the removal rate of 95% or above is achieved for low-concentration SO2 through the copper slag tailings of smelting tailings, and valuable metal copper with high additional value in the copper slag tailings is leached out and recovered. The method is simple in process, the used desulfurization absorbent is low in cost, energy consumption is low, benefits of an enterprise can be increased, and the method is an efficient utilization method integrating smoke desulfurization and slag tailings recycling comprehensive recovery.

The application discloses a treatment method of Cu-EDTA heavy metal complex wastewater. The treatment method comprises the following steps: firstly, synthesizing a piezoelectric composite of barium titanate/graphene by a hydrothermal method; under pressure provided by ultrasonication, breaking down heavy metal complexation and degrading organic matter obtained after breakdown by virtue of the piezoelectric chemical effect of piezoelectric material; and further adsorbing and recovering free Cu<2+> or weak complex Cu<2+> by graphene in a solution obtained by breakdown and degradation, so as to effectively remove Cu-EDTA heavy metal complex wastewater. According to the application, by coupling the piezoelectric effect and the chemical process as well as the adsorption and electric desorptioneffects, the situation of high cost, cumbersome process, serious secondary pollution and secondary recovery of a traditional heavy metal wastewater treatment method is broken through, the effective removal of EDTA and the efficient recovery of Cu<2+> are implemented, the shortcomings of traditional technology are overcome, and as a green and efficient processing technology, the treatment method provides a new development direction for novel water treatment technology.

The invention relates to the technical field of hydrometallurgy, and in particular to a method of recovering manganese, lead and silver from electrolytic zinc anode mud. Manganese in the electrolytic zinc anode mud of a cathode region is reduced and leached by means of a diaphragm electrolysis method, and hydrogen is generated on a cathode. Under the stirring action of the cathode region, reduction leaching of manganese dioxide can be enhanced, so that the leaching efficiency of manganese dioxide reaches 95% above; lead sulfate and a compound of silver enter cathode leaching residues to be enriched. In an anode region of a diaphragm electrolyzer, almost leached manganese sulfate is electrolytically oxidized to manganese dioxide and is deposited on an anode plate or in the bottom of the anode region, and a small part of manganese sulfate residues are left in the electrolyte and are returned to an electrolytic zinc system to supplement manganese ions. In the electrolytic process, graphite is taken as the anode, so that the purity of manganese dioxide reaches 80% above.

The invention discloses a beneficiation method for recovering molybdenum from a tungsten tin associated sulfide ore bulk concentrate. The beneficiation method is characterized by comprising the following steps: after the heating reagent removal is performed for a sulfide ore bulk concentrate obtained from a tungsten tin associated sulfide ore; water is added for mixing pulp; quicklime is added for stirring to adjust the pulp; an inhibitor and a collecting agent are added for primary roughing to obtain a primary roughing concentrate and a primary roughing tailing; the collecting agent is added in the primary roughing tailing for secondary selection to obtain a secondary selection concentrate and a secondary selection tailing; and three times of blank selection are performed for the secondary selection concentrate to obtain a molybdenum concentrate. The method obtains the molybdenum concentrate with a molybdenum grade of 48-52% and a molybdenum recovery rate of 87-93%, reduces the molybdenum selection cost, generates no waste water and other substances harmful to the environment, and is an environment-friendly beneficiation method. The method is suitable for recovering molybdenum from the tungsten tin associated sulfide ore bulk concentrate.

The invention discloses a method for selective flotation separation of molybdenum and rhenium acid radicals in an alkaline leaching liquid. The method comprises the following steps that a pH value ofthe alkaline leaching liquid containing molybdate acid radicals and rhenium acid radicals is adjusted to 7.1-12, then an organic matter modified activated carbon collecting agent composed of triethylenetetramine, tetraethylenepentamine, methyl violet 10B and cocamidopropyl betaine and a surface active agent are added into the alkaline leaching liquid, pneumatic flotation is carried out, a foam product is a rhenium-rich component, and a liquid core is a molybdenum-rich solution. The method has the advantages that the selective separation effect is good on molybdenum and rhenium, the technological process is simple, and the cost is low, and is especially suitable for separation between the rhenium and the molybdenum in the alkaline leaching liquid with low rhenium content and high molybdenumcontent.

A contaminated soil in-situ circulation leaching treatment method adopting an electrochemical treatment leacheate comprises the following steps that firstly, an electrochemical reactor is arranged on a contaminated soil ground, the upper portion of the chemical reactor is open, the leacheate enters from the upper portion, and the upper portion of the chemical reactor is open; the bottom of the electrochemical reactor is communicated with a leacheate discharge pipe network arranged in the polluted soil through a discharge pipe; 2, after entering the contaminated soil, the leacheate absorbs pollutants in the soil and then is enriched in a water collecting well, and then the leacheate in the water collecting well is sent back into the electrochemical reactor through a sewage pump, so that circulation of the leacheate is achieved; and step 3, after the leacheate is circulated stably, electrifying the positive electrode plate and the negative electrode plate to enrich heavy metal ions in the leacheate and degrade organic pollutants so as to realize efficient circulating operation of the leacheate. The leacheate subjected to electrochemical treatment enters the leacheate discharge pipe network system below again, so that efficient cyclic utilization of the leacheate is realized.

The invention provides a method and system for treating solid waste through a smelting reduction process. The method comprises the following steps of mixing and batching iron-containing solid waste to prepare an iron-containing material; preheating and pre-oxidizing the iron-containing material; spraying the preheated and pre-oxidized iron-containing material into an oxidation-reduction furnace by taking compressed air as carrier gas; spraying carbon-containing solid waste into the oxidation-reduction furnace by taking recycled coal gas as carrier gas, and reacting the carbon-containing solid waste with the iron-containing material to generate molten iron, carbon monoxide and furnace slag; and spraying high-temperature oxygen into the oxidation-reduction furnace, carrying out a secondary combustion reaction on the high-temperature oxygen and combustible components in ascending gas flow, and recycling coal gas generated by the secondary combustion reaction and coal gas which does not participate in the secondary combustion reaction. According to the method, traditional fuel, lime, dolomite and other fluxing agents do not need to be added, compressed air and recycled coal gas are adopted as carrier gas to convey materials, high-temperature oxygen is adopted as a combustion improver, and solid waste recycling and large-scale comprehensive utilization are achieved.

The invention belongs to the technical field of weathered crust rare earth enrichment, and particularly relates to a method for enriching rare earth elements in a weathered crust by using pteridophytes. The method comprises the following steps of 1) soil pretreatment; and 2) pteridophyte planting, wherein the pteridophytes are planted on the weathered crust, and the pteridophytes comprise one or more of blechnum orientale, dicranopteris pedata, athyrium filix-femina, dryopteris filix-mas, asplenium trichomanes, diplopterygium glaucum, lindsaea odorata, woodwardia japonica, stenoloma chusana, adiantum flabellulatum, cibotium barometz, microlepia strigosa and diplazium donianum. Different pteridophytes are planted on different structural layers of the weathered crust in different modes to be used for adsorbing rare earth elements in soil, so that the rare earth resources can be effectively utilized; and the effect of improving the surrounding ecological environment can be achieved by planting the pteridophytes in the weathered crust soil. Compared with an existing rare earth mining technology, the method cannot cause secondary pollution. The method provides an economical and effective solution way for realizing ecological management of rare earth polluted land and rare earth reclamation.

The invention discloses a recovery device for a volatile organic solvent gaseous membrane of an electrophoresis tank; the recovery device comprises an air suction assembly, a degassing membrane assembly and a recovery assembly; one end of the degassing membrane assembly is fixedly communicated with the air suction assembly, a vacuum pump is fixedly communicated between the recovery assembly and the degassing membrane assembly, and the air suction assembly comprises an air suction cover and an air suction fan; and the air suction cover and an air inlet of the air suction fan are fixedly communicated through an air pipe; the degassing film assembly comprises a shell and a degassing film air bag arranged in the shell, an air inlet pipe is fixedly mounted at one end of the shell, two sets of air outlet pipes are symmetrically mounted on one side of the degassing film air bag, and the two sets of air outlet pipes extend out of the shell. The air suction assembly, the degassing membrane assembly and the recovery assembly are sequentially arranged, gas is collected and filtered, the device is simple and high in practicability, and the treatment cost is reduced.

The invention belongs to the technical field of the treatment of heavy metal ions in industrial waste water and the extraction of rare earth ions in rare earth mines, and aims to solve the problem that existing hydroxamic acid materials cannot produce polymer effects, such as high adsorption characteristics, separable, reusable and other characteristics, and The invention does not have the advantages of good physical and chemical stability and simple operation of chelating resins, and provides a hydroxamic acid functionalized polymer/inorganic composite chelating adsorption material and a preparation method thereof. It is composed of carrier micron-level silica and hydroxamic acid functionalized polymer that selectively recognizes and adsorbs heavy metal ions and rare earth ions. The particle size of the micron-level silica is 90-125 μm. The adsorption material of the present invention can effectively remove heavy metal ions in industrial wastewater and extract rare earth ions from rare earth ores. The preparation method is simple, the performance is stable, and it has strong selective recognition and adsorption capabilities for heavy metal ions and rare earth ions. It is fast and easy to regenerate, so it can be used repeatedly.

The invention provides a method for comprehensively treating electroplating comprehensive wastewater, and belongs to the technical field of sewage treatment. The electroplating comprehensive wastewater is treated by comprehensively applying various treatment methods such as electrochemical sedimentation treatment, metal enrichment, oxidation, filtration, salt concentration and separation, reverse osmosis and the like, so that enrichment and recovery of valuable metal ions in the comprehensive electroplating wastewater, reduction of mud and deep purification treatment of chemical pollutants are realized; and the recycling of water resources is effectively ensured, and meanwhile, industrial salt, valuable metal products and mud are separated, so that zero discharge of wastewater and recycling of resources are achieved.