147 results about "Iron sulphur" patented technology

The invention discloses a modified ceramsite filler based on iron-sulfur autotrophic denitrification as well as a preparation method and application thereof, and belongs to the technical field of sewage treatment. The modified ceramsite filler based on iron-sulfur autotrophic denitrification is ceramsite loaded with a modifier; the modifier comprises the following components: iron powder, pyrite powder and biochar; the mass ratio of the iron powder to the pyrite powder to the charcoal is 3: 6: 1; the mass ratio of the modifier to the ceramsite is 1.5: 1. The iron powder (zero-valent iron), the pyrite powder and the biochar are combined to modify the common ceramsite, the denitrification effect of the biofilter on low C / N wastewater is greatly improved, and under typical experimental conditions, the denitrification rate of the biofilter containing the modified ceramsite filler on low-carbon-nitrogen-ratio wastewater is improved by 90% or above compared with that of a common ceramsite biofilter. And the modified ceramsite filler prepared by the invention can obviously improve the phosphorus removal effect of the biological filter on wastewater with low carbon nitrogen ratio.

The invention relates to the technical field of metallurgy, in particular to an efficient-utilization copper-cobalt ore dump leaching treatment method which comprises the steps that after copper-cobalt sulfide ore and copper-cobalt oxide ore are subjected to crushing treatment respectively, heap building is conducted; a solution of acidithiobacillus ferrooxidans is added into a sulfuric acid solution to serve as spraying liquid, heap leaching treatment is conducted on the heap-built copper-cobalt ore through a spraying device, and the spraying flow of the spraying device is controlled in the heap leaching treatment process according to changes of the environment temperature and humidity and changes of the pH value of heap leaching liquid; the obtained dump leaching liquid is subjected to extraction-electrodeposition treatment, and cathode metal copper, sediment and raffinate are obtained; and the raffinate serves as spraying liquid to be subjected to spraying circulation, precipitation is neutralized, and metal cobalt is recycled. The spraying flow of the spraying device is accurately controlled and adjusted, and the leaching effect of copper and cobalt metal in the copper-cobalt ore is improved.

The invention discloses a carbon dioxide injection and production well cementation cement paste and a preparation method and application thereof, the well cementation cement paste comprises the following components by weight: 95-105 parts of oil well cement, 44-48 parts of water, 4-6 parts of a polymer emulsion, 4-6 parts of a self-repairing material, 1.5-2.5 parts of a drag reducer, 0.5-1.5 parts of a fluid loss agent and 0.2-0.8 part of an antifoaming agent; wherein the polymer emulsion is an emulsion which is formed by taking methyl methacrylate, vinyl trimethoxy silane and propylene carbonate as monomers through polymerization; the self-repairing material is a microcapsule in which thiobacillus ferrooxidans thalli and bacillus amyloliquefaciens thalli are embedded. The well cementation cement paste keeps good strength and relatively low permeability in a carbon dioxide environment, is good in corrosion resistance and has self-repairing capability.

The invention relates to the technical field of water pollution control and treatment, and particularly discloses a method for deeply treating wastewater based on an adsorbent, which comprises the following steps of: firstly, introducing a mixed gas of carbon dioxide and air into fly ash water washing liquid, and removing calcium ions in the water washing liquid in a calcium carbonate precipitation form in a continuous introducing process; interference of calcium ions on adsorption and electrodialysis processes in the subsequent treatment process is avoided, heavy metals in the water washing liquid are accurately adsorbed and removed while the iron-sulfur loaded magnetic mesoporous biochar is used for activating efficient oxidation of persulfate, finally, electrodialysis treatment is performed on the water washing liquid by using a self-made bipolar membrane, chlorine in water is taken out, and the heavy metals in the water washing liquid are removed. And the washing liquid can meet the requirement of wastewater discharge.

The invention discloses a sludge carbon loaded Schwertmannite immobilized iron-sulfur reducing bacteria composite material as well as a preparation method and application thereof. The method comprises the following steps: performing high-temperature pyrolysis on sludge to obtain sludge carbon; mixing the sludge carbon with a ferrous sulfate solution, then adding a hydrogen peroxide solution to carry out oxidation reaction, and carrying out solid-liquid separation to obtain a sludge carbon loaded Schwertmannite material; and adding the sludge carbon-loaded Schwertmannite material into a culture medium containing iron-sulfur reducing bacteria, carrying out bacterial culture until the culture medium is black, and carrying out solid-liquid separation to obtain the sludge carbon-loaded Schwertmannite material. The obtained mineral microorganism composite material is excellent in adsorption performance, large in adsorption capacity and high in stability, can efficiently remove heavy metal ions such as Sb (V), Cd (II) and Pb (II), and is particularly suitable for repairing heavy metal pollution in mining areas.

The invention provides an extreme acidophilic bacterium flora. The extreme acidophilic bacterium flora comprises acidophilic thiobacillus with the preservation number of CGMCC (China General Microbiological Culture Collection Center) No.14839 and iron-sulfur oxidizing bacteria with the preservation number of CGMCC No.26454. According to the invention, two strains of extreme acidophilic bacteria obtained by screening are compounded to construct a double-bacteria mineral leaching system. The compounded flora can realize metabolism cooperation of autotrophic bacteria and abnormal bacteria, can realize coupling of iron-sulfur oxidation, can be applied to efficient leaching of pyrite, and has a more efficient ore leaching effect compared with a single strain. And the artificial mixed flora has definite microbial composition, so that the controllability in the bioleaching process is improved.

The invention discloses a high-temperature-resistant fine-grain high-conductivity copper material, which belongs to the technical field of high-performance copper materials for electronic communication and comprises the following raw materials in percentage by mass: 8 to 50 ppm of iron, 15 to 20 ppm of sulfur, 10 to 15 ppm of manganese, 20 to 25 ppm of titanium, 10 to 20 ppm of aluminum, 5 to 10 ppm of chromium and the balance of copper and inevitable impurities. The invention further discloses a preparation method of the high-temperature-resistant fine-grain high-conductivity copper material. Nitrogen is introduced in the smelting process, a proper hot rolling structure is obtained by controlling the hot rolling deformation amount and the finish rolling temperature, grains with the small size can be obtained at the high temperature by combining the copper material prepared through the set cold rolling and annealing technology, and the conductivity and the high-temperature structure stability are well considered. According to the high-temperature-resistant fine-grain high-conductivity copper material, the conductivity is 100% IACS or above, and the average grain size is smaller than 150 micrometers after heat preservation treatment is conducted for 10 min at the temperature of 1065 DEG C.

The invention discloses a remediation agent for high-concentration hexavalent chromium polluted soil and a preparation method and a remediation method thereof, and belongs to the technical field of soil pollution remediation. The remediation agent for the high-concentration hexavalent chromium contaminated soil comprises an acidic precursor, an iron-sulfur reducing agent and a synergist, the acidic precursor comprises organic acid and propylene glycol alginate; the iron-sulfur reducing agent comprises an iron-based reducing agent and a sulfur-based reducing agent; the synergist is prepared from sophorolipid and alkyl glucoside. The remediation agent can be used for high-concentration hexavalent chromium contaminated soil, hexavalent chromium in the soil is exposed in a Cr < 6 + > ion form as much as possible by replacing the hexavalent chromium in the soil, then the hexavalent chromium is converted into trivalent chromium by using a reducing agent, and the removal efficiency of the hexavalent chromium reaches up to 99.6%. In addition, the soil remediation agent is simple in use mode, rapid and thorough in reaction and lasting in effect.

The invention discloses an organic wastewater advanced treatment method and device with low agent input. The method comprises the following steps: an anaerobic biological iron-sulfur reduction reaction process: fully mixing elemental sulfur, ferric iron, iron-sulfur reduction sludge and wastewater containing organic carbon and organic pollutants with electronegative groups, carrying out anaerobic biological elemental sulfur reduction and iron reduction reactions, and directionally generating polysulfide and ferrous sulfide in situ; a nucleophilic substitution reaction process: carrying out nucleophilic substitution reaction on the organic pollutants with the electronegative groups and the polysulfide, and removing the electronegative groups to generate a reduced organic product; in the oxidation reaction process, ferrous sulfide reacts with dissolved oxygen to generate hydroxyl free radicals, the reduction state organic product is oxidized and degraded, and elemental sulfur and ferric iron are generated; and a sludge precipitation process: refluxing the precipitate to the anaerobic biological iron-sulfur reduction reaction zone, and discharging clarified water. The method provided by the invention realizes deep degradation and detoxification of refractory organic pollutants, and has the advantages of low agent investment, low cost and no secondary pollution.

The invention relates to iron-rich-belite sulphoaluminate cement prepared from iron tailings and fluorgypsum and a method. The iron-rich-belite sulphoaluminate cement is prepared from iron-rich-belite sulphoaluminate cement clinker and natural gypsum in a mass ratio of 100: (6-18), the iron-rich type-belite sulphoaluminate cement clinker is prepared from the following raw materials in percentage by mass: 15 to 18 percent of iron tailings, 6 to 10 percent of fluorgypsum, 20 to 23 percent of steel slag, 12 to 14 percent of aluminum ash and 39 to 43 percent of limestone. The iron tailings, the fluorgypsum, the steel slag, the aluminum ash and the limestone synergistically provide required calcium, silicon, aluminum, iron and sulfur, hydration of the iron-rich belite sulphoaluminate cement clinker is facilitated to generate a target hydration product by supplementing a certain amount of natural gypsum, and the ratio of the raw materials is controlled, so that the mechanical property of the obtained cement is excellent; the consumption of natural raw materials is reduced, the cost of the raw materials is reduced, and the preparation method is simple and beneficial to industrialization.

The invention discloses a method for enhancing biological leaching of copper in a waste circuit board by utilizing magnetite. The method comprises the following steps: adding the pre-crushed waste circuit board and magnetite into a 9K culture medium with the pH value of 1.8-2.0 according to a certain mass ratio, inoculating Acidithiobacillus ferrooxidans as a leaching strain, and carrying out a leaching reaction under a constant-temperature oscillation condition. The magnetite is added, so that the leaching of copper in the circuit board is remarkably enhanced, the leaching rate is remarkably improved, and the leaching period is shortened. And compared with the microbiological leaching result without magnetite, the copper leaching rate is improved by 12-32%. By utilizing the difference between the circuit board and the magnetite in particle size, the magnetite can be recycled from the leaching residues through a physical separation means for a new round of leaching. The method is simple in process, the strain is easy to culture, and the method has good environmental friendliness and is suitable for green and efficient recovery of copper in the waste circuit board.

The present invention relates to the field of sodium ion batteries, and discloses a caged cobalt iron sulfide carbon nanofiber composite material and a preparation method and application thereof, the method comprising: obtaining a caged cobalt iron Prussian blue analog by a coprecipitation method, and preparing a spinning solution with a high molecular polymer as the main raw material; obtaining a beaded fiber precursor by electrostatic spinning, and after pre-oxidation in air and pyrolysis in an inert protective atmosphere, heat-treating it together with a sulfur source or a selenium source to obtain a caged cobalt iron sulfide (CoS2 / FeS2 or CoSe2 / FeSe2) carbon nanofiber composite material. The cage structure in the present invention can increase the contact area between the electrode active material and the electrolyte, and the carbon fiber skeleton can effectively improve the conductivity and alleviate the volume change of the electrode material during the charge and discharge process. When the prepared composite material is used as the negative electrode material of the sodium ion battery, it exhibits excellent long cycle performance and rate performance.

The invention belongs to the technical field of heavy metal contaminated soil bioremediation, and particularly relates to a method for remediating heavy metal contaminated soil through a Fe3C-N-S composite modified electrode enhanced bioelectrochemical system. Graphene oxide, an iron source, a nitrogen source and a sulfur source serve as raw materials, a Fe3C-N-S composite material is prepared through high-temperature calcination, then the Fe3C-N-S composite material is compounded with sodium alginate (SA) hydrogel, the surface of a graphite rod is coated with the composite material, a Fe3C-N-S composite modified electrode is constructed through a CaCl2 cross-linking and freeze-drying technology, then the modified electrode is coupled with a graphite cathode, and the composite material is obtained. And the acidophilic thiobacillus ferrooxidans is combined to construct a bioelectrochemical system, so that the synergistic and efficient leaching of the heavy metals in the soil is realized. The conductivity, biocompatibility and corrosion resistance of the electrode can be remarkably improved, the problems that mass transfer is difficult and microorganism loading is unstable in BES remediation are solved, and a breakthrough technical scheme is provided for green and efficient remediation of heavy metal contaminated soil.

Disclosed is an eye drop composition for treating and preventing eye diseases. The eye drop composition for treating and preventing eye diseases contains, as active ingredients, minerals that have lost at least one electron, selected from germanium (Ge), silver (Ag), iridium (Ir), nickel (Ni), palladium (Pd), tantalum (Ta), antimony (Sb), zinc (Zn), indium (In), boron (B), astatine (At), thallium (Tl), magnesium carbonate (MgCO3), tin (Sn), iron (Fe), calcium sulfide (CaS), molybdenum (Mo), chromium (Cr), sodium (Na), tungsten (W), gallium (Ga), strontium (Sr), potassium (K), beryllium (Be), barium (Ba), magnesium (Mg), scandium (Sc), yttrium (Y), calcium (Ca), titanium (Ti), vanadium (V), hafnium (Hf), bromine (Br), zirconium (Zr), copper (Cu), manganese (Mn), rubidium (Rb), technetium (Tc), platinum (Pt), niobium (Nb), gold (Au), phosphate (Pi), rhenium (Re), ruthenium (Ru), cobalt (Co), zinc oxide (ZnO), aluminum (Al), selenium (Se), bismuth (Bi), phosphorus (P), rhodium (Rh), silicon (Si), iodine (I), tellurium (Te), sulfur (S), lithium (Li), osmium (Os), magnesium hydroxide (Mg(OH)2), and cesium (Cs), wherein the minerals are at least five types of minerals. The eye drop composition is very safe for the human body, and thus can be very effectively used as an eye drop agent for treating and preventing eye diseases, as well as for completely curing cataracts.

The invention discloses a method for passivating trivalent arsenic in farmland soil by using iron-sulfur minerals, and belongs to the technical field of soil pollution remediation. The method is applied to farmland soil, iron-sulfur minerals, hyposulfate and the like commonly existing in the soil are added, and the conversion and passivation mechanism of trivalent arsenic (As (III)) after the components are coupled is studied. The hyposulfate can generate a series of free radicals after being easily coupled and activated by metal minerals in a water body, the free radicals are main driving force for oxidizing As (III), the iron-sulfur minerals and the hyposulfate serve as electron donors in the reaction, and oxygen serves as an electron acceptor. Meanwhile, the efficiency of fixing pentavalent arsenic (As (V)) can be remarkably improved by a coupling substance generated after oxidation. Therefore, the invention provides a new thought for prevention and control of arsenic pollution of farmland soil, and shows a wide application prospect.

The invention discloses an iron-sulfur-carbon-based composite filler for removing florfenicol in tail water, and belongs to the technical field of water treatment materials. The composite filler is composed of charcoal, pyrite, a calcium base, a binder and zeolite in proportion, through the synergistic effect of all the components, an adsorption-reduction-degradation combined mechanism is achieved, and florfenicol in municipal tail water and aquaculture tail water is efficiently removed. The preparation method comprises the steps of ingredient mixing, roller granulation, maintenance forming and the like, is simple in process and low in cost, and can be used for recycling preparation of agricultural and mine wastes. The filler is suitable for constructed wetlands and other water treatment scenes, the removal rate of florfenicol reaches 80% or above, meanwhile, the filler has the removal effect on nitrate nitrogen and other pollutants, and wide application prospects are achieved.

The invention relates to a metal leaching agent and a method for leaching and recovering metal from a retired photovoltaic module step by step. The metal leaching agent comprises an acidophilic thiobacillus ferrooxidans solution, a hidden acidophilic bacteria solution and a thiobacillus thiooxidans solution, the volume ratio of the acidophilic thiobacillus ferrooxidans liquid to the hidden acidophilic bacteria liquid to the thiobacillus thiooxidans liquid is (0.5-1.5): (0.5-1.5): (0.5-1.5); wherein the concentration of the acidophilic thiobacillus ferrooxidans, the acidophilic hidden bacteria and the thiobacillus thiooxidans is (1-9) * 10 < 8 > cells / mL. Furthermore, the invention provides a method for leaching and recovering metal from the retired photovoltaic module step by step. According to the method, the metal leaching agent is utilized, mild and green recovery of aluminum and silver in the decommissioned photovoltaic cell piece and full-process recovery of the decommissioned photovoltaic module can be achieved through step-by-step biological leaching, and the method has the excellent leaching effect on aluminum and silver.

The present invention provides a biological filler, a preparation method, and its application in sewage treatment. The method involves biologically treating slag produced during the beneficiation of low-grade sulfide ore, followed by drying and screening to obtain a target filler required for the sulfur autotrophic denitrification process. Since the target filler primarily comprises pyrite, pyrrhotite, and metal-deficient polysulfides, it can provide the energy required for the growth and metabolism of iron-sulfur autotrophic denitrification bacteria, thereby achieving efficient removal of ammonia nitrogen, COD, total phosphorus, and a small amount of heavy metals, effectively reducing pollutant emissions from industrial and domestic wastewater. The method also produces virtually no sludge, avoiding sludge bulking and subsequent disposal. Furthermore, the method effectively utilizes waste rock and tailings generated by mining activities as resources, reducing land use and the generation of solid waste.

The invention discloses a preparation method of a water-soluble copper-iron-sulfur colloidal quantum dot with near-infrared absorption characteristic, hexamethyldisilazane is used as a sulfur precursor, an organic sulfur source and an n-octadecene solvent can rapidly form a colloidal quantum dot nucleation site, and the nucleation and growth process of the quantum dot is controlled in stages. Therefore, the CuFeS2 colloidal quantum dot has a tetrahedral morphology and has a determined exposed crystal face. The CuFeS2 colloidal quantum dots prepared by the method are uniform in morphology, uniform in size and narrow in particle size distribution; the process is simple and easy to implement, synthesis equipment is low in price, molecular beam epitaxy equipment and the like required by a traditional semiconductor are not involved, and the method is very suitable for high-productivity preparation of colloidal quantum dots for photoelectric detection and photovoltaic devices.

This invention discloses a slow-release sulfurizing agent Fe x S y Its preparation method and application as a rhenium extraction material: Step 1: The pyrite-doped metal roasting product is subjected to an oxidation-reduction reaction, and the raw material is dried and roasted to obtain the product; Step 2: The product is ground and screened to obtain the slow-release sulfiding agent Fe. x S y The slow-release sulfurizing agent Fe x S y Its application, as a slow-release sulfide material, is used in metal corrosion protection, heavy metal-containing wastewater treatment, and soil sulfide replenishment; this invention achieves S 2 The slow release of the substance controls the local effective concentration and forms highly active iron-sulfur chemical bonds. At the same time, the crystal structure is a low-stability crystal system, thus exhibiting high chemical reactivity, which has obvious technical advantages over existing rhenium extraction materials.

The invention provides an iron-sulfur isotope equilibrium fractionation factor calculation method based on a density functional theory. The iron-sulfur isotope equilibrium fractionation factor calculation method comprises the following steps: firstly, constructing initial mineral models of amorphous FeS, cubic FeS, maquinol ore, hematite, hematite and pyrite; the model is optimized through a spin polarization DFT + U method, GGA-PBE functional, OTFG ultra-soft pseudo potential, 400 eV plane wave cutoff energy and 5.0 * 10 <-7 > Hartree self-consistent field convergence standards are selected as calculation parameters, and the optimal Hubbar Ueff value and magnetic sequence arrangement of each mineral are determined; and finally, calculating the simple harmonic vibration frequency of the mineral, and deducing equilibrium fractionation factors (1000ln beta value) of Fe and S isotopes at a specific temperature. According to the method, the theoretical blank of isotope fractionation of the conversion path from amorphous FeS to pyrite is filled up, the data can be used for judging the isotope balance of minerals and tracing the mineralization process, and an important theoretical basis is provided for research on sedimentary diagenesis and ancient ocean redox.

The invention belongs to the technical field of metallurgy, and particularly discloses a method for extracting gold from refractory iron-sulfur-gold concentrate by a wet process, which comprises the following steps: smelting the refractory iron-sulfur-gold concentrate by a pyrogenic process to obtain iron matte slag rich in gold and silver; the method comprises the following steps: crushing, ball-milling and slurrying the iron matte slag, introducing rich oxygen, carrying out pressure leaching under an acidic condition, and carrying out liquid-solid separation to obtain oxygen pressure leaching liquid and oxygen pressure leaching slag; cooling and crystallizing the oxygen pressure leachate to recover ferrous sulfate heptahydrate, and periodically vulcanizing, precipitating and recovering other valuable metals through crystallization mother liquor; sulfur, sulfur concentrate slag and gold and silver slag are separated from oxygen pressure leaching slag through conventional flotation, the sulfur concentrate slag is returned to the pyrogenic smelting process, and gold and silver products can be obtained by dissolving the gold and silver slag through aqua regia and selective reduction.

The invention discloses a magnetic FeS2 / biochar material for activating peracetic acid to degrade antibiotics and a preparation method of the magnetic FeS2 / biochar material. Mixing and stirring the biochar raw material and the iron-sulfur source under a nitrogen atmosphere condition; transferring the obtained solution into a reaction kettle, heating at a fixed temperature, after the reaction is finished, filtering and separating a solid-phase substance, washing the solid-phase substance with ultrapure water for multiple times, drying and cooling, and grinding with a mortar; and dispersing the solid in a crucible, heating at a fixed temperature, naturally cooling, and grinding by using a mortar to obtain the magnetic FeS2 / biochar material. By accurately regulating and controlling the concentration and the temperature of an iron-sulfur source, compared with a common modification method, the method is simpler and easier to regulate and control, and compared with an original biochar material, the method has more efficient PAA degradation activation capacity, the preparation process is simpler, parameters are easy to control, complex post-treatment steps are not needed, efficient pollutant degradation performance and cycle stability are achieved, and the method is suitable for industrial production. And after use, the device can be quickly recovered through magnetic attraction.

The invention belongs to the technical field of constructed wetlands, and discloses a siphon constructed wetland system and a method for synchronously removing antibiotics and nitrogen, a bed body of the siphon constructed wetland system is sequentially provided with a supporting bottom layer, an iron-sulfur layer and a surface layer from bottom to top, and a flow guide partition plate is vertically arranged in the middle of the bed body and divides the bed body into a water inlet side area and a water outlet side area; the flow guide partition plate penetrates through the bottom layer and the iron-sulfur layer and is located on the supporting bottom layer, and the flow guide partition plate is made of biochar; the water inlet pipe is connected with the top of the water inlet side area, the water outlet pipe is a siphon pipe, the siphon pipe is of an inverted U-shaped pipe structure, the communicating position of an inlet of the siphon pipe and the water outlet side area is located at the set height of the constructed wetland, and the height is 1 / 5-1 / 2 of the total height of the constructed wetland. The height of the bottom end of the water outlet pipe of the siphon wetland is increased, so that the problem that the actual retention time of sewage near the water inlet of the siphon wetland does not accord with the preset time is solved.

The invention discloses a process for firing sulfuric acid and co-producing calcium ferrite from ardealite, which specifically comprises the following steps: uniformly mixing ardealite with auxiliary materials such as sulfuric-acid residue, high-silicon material, pulverized coal and the like, preparing into a block mass, distributing, drying, roasting and cooling, the drying is divided into an air draft drying section and a forced air drying section, the drying hot air comes from circulating flue gas of different cooling sections, and the air draft drying section and the forced air drying section are communicated with the air draft drying section; the comprehensive energy consumption is effectively reduced, flue gas of a roasting section is derived from waste gas of a forced air drying section, SO2 in the flue gas can be enriched while flue gas circulation is achieved, high-sulfur flue gas is obtained, sulfuric acid is prepared through purification, conversion and absorption of the obtained high-sulfur flue gas, and calcium ferrite is obtained after an obtained solid roasted product is cooled. And resource recycling of calcium and sulfur in the phosphogypsum and iron and sulfur in the sulfuric-acid slag is realized with relatively low energy consumption.

The application discloses a kind of low reagent input's organic wastewater advanced treatment method and device.The method includes the following steps: anaerobic biological iron sulfur reduction reaction process: elemental sulfur, ferric iron, iron sulfur reduction sludge, organic carbon-containing and electrically negative group organic pollutant wastewater is mixed sufficiently, anaerobic biological elemental sulfur reduction and iron reduction reaction are carried out, in situ directional generation polysulfide and ferrous sulfide;Nucleophilic substitution reaction process: electrically negative group organic pollutant and polysulfide carry out nucleophilic substitution reaction, and remove electronegativity group to generate reduced state organic product;Oxidation reaction process: ferrous sulfide and dissolved oxygen reaction produce hydroxyl radical, and oxidize degradation reduced state organic product, produce elemental sulfur and ferric iron;Sludge sedimentation process: sediment flows back to anaerobic biological iron sulfur reduction reaction zone, and clarified water is discharged.The application realizes the advanced degradation and detoxification of refractory organic pollution, with the advantages of low reagent input, low cost, no secondary pollution.

The invention relates to the technical field of microorganism in-situ leaching uranium mining, and particularly discloses a device and a method for flow culture of thiobacillus ferrooxidans under the condition of low iron concentration. The device comprises a culture medium tank, an oxidation tank module and a liquid injection tank, the culture medium tank is arranged at the leftmost end of the device, and the top is provided with a lower injection pipeline and a concentrated sulfuric acid pipeline; a first oxidation tank, a second oxidation tank, a third oxidation tank, a fourth oxidation tank, a fifth oxidation tank, a sixth oxidation tank, a seventh oxidation tank and an eighth oxidation tank of the oxidation tank module are sequentially connected in series through oxidation tank pipelines; the first oxidation tank and the eighth oxidation tank are connected through a mature bacterial liquid return pipe; the first oxidation tank and the fourth oxidation tank are respectively matched with a glasses tube and a culture medium tank; and a liquid injection tank is arranged at the right end of the oxidation tank module and is connected with an eighth oxidation tank through a connecting pump. The device improves the living environment of the thiobacillus ferrooxidans, increases the activity of the thiobacillus ferrooxidans, shortens the adjustment period and logarithmic phase in the growth cycle of bacteria, and improves the production quantity of bacteria liquid.

A system comprising a chlorination reactor with three reaction zones and methods using the reactor for the extraction and separation of iron, sulphur, copper and manganese from a feed material containing sulphides of iron, nickel, cobalt, copper, silver, gold and platinum group metals (PGM) and further for separation of these metals in the form of volatile chloride complexes from nickel, cobalt, silver, gold and platinum group metals. In the method, sulphur and iron are converted to volatile chlorides by the treatment of the feed material with gaseous chlorine at elevated temperature and pressure and extracted. Metal chlorides of manganese and copper are reacted in situ with ferric chloride vapours to form volatile complexes. These volatile complexes are removed from the reactor together with disulphur dichloride and ferric chloride and are separated by distillation and fractional desublimation. Disulphur dichloride is recycled to the reactor and removed as sulphur.

The invention belongs to the field of comprehensive utilization of non-ferrous metal resources, and particularly discloses a method for comprehensively utilizing cobalt-sulfur concentrate, which comprises the following steps of: aiming at the cobalt-sulfur concentrate which is a byproduct comprehensively utilized by vanadium titano-magnetite, mixing ferrous sulfate according to a specific proportion, performing microwave drying and grinding, and performing two-stage fluidized bed roasting to obtain the cobalt-sulfur concentrate. The cobalt calcine is subjected to ore dressing and cobalt concentrate enrichment through jigging reselection and low intensity magnetic separation, the cobalt concentrate is subjected to pressure leaching to efficiently separate iron and cobalt, cobalt, nickel and copper are recycled from cobalt leaching liquid in a wet extraction metallurgy mode, and cobalt leaching residues are subjected to tempering, drying and magnetic separation to prepare fine iron powder. According to the process, the resource utilization rate of iron, sulfur and cobalt is increased, comprehensive energy consumption is low, economic and environmental benefits are achieved, and a new path is provided for comprehensive utilization of vanadium titano-magnetite associated cobalt resources.

The invention belongs to the technical field of composite material photocatalysis, and provides a preparation method and application of an iron titanate / sulfur indium zinc composite material. According to the preparation method, in-situ growth is carried out through a two-step hydrothermal method, firstly, an iron source, a titanium source and the like are subjected to stirring, hydrothermal reaction and calcination to prepare ferric titanate, then the ferric titanate is mixed with a zinc source, an indium source, a sulfur source and the like, ultrasonic dispersion is carried out, hydrothermal reaction is carried out, and the composite material is obtained. The method has the advantages of abundant raw material sources, simple operation, no need of complex equipment and process, preparation cost reduction, and facilitation of large-scale industrial production. The prepared composite material has a good crystal structure, the recombination probability of photon-generated carriers can be reduced, and the photocatalytic activity is remarkably improved. The iron titanate / indium zinc sulfide composite material has good visible light degradation performance on various dye wastewater.