117 results about "Iron sulphur" patented technology

The invention discloses a reduction sulfur-fixing bath smelting method and device of a low-sulfur lead-containing secondary material and iron-rich heavy metal solid waste. The reduction sulfur-fixing bath smelting method comprises the steps of: with iron-rich heavy metal solid waste as a sulphur-fixing agent and smokeless conny as a reducing agent, firstly, fully uniformly mixing raw materials such as the low-sulfur lead-containing secondary material with the sulphur-fixing agent and a solvent, drying and pelleting, then continuously adding a mixed pelleted material and the reducing coal (fuel) into an oxygen side-blowing bath smelting furnace for reduction sulphur-fixing smelting, further producing lead bullion, iron sulphur and sulphur-containing slag in one step under the condition that no sulfur dioxide is generated. According to the method, sulphur in the raw materials is fixed in the sulphur-containing slag and iron sulphur, so that low-concentration sulfur dioxide pollution is thoroughly eliminated, valuable elements such as iron, gold, silver, tin, antimony and bismuth in the sulphur-fixing agent are recycled with high efficiency at low cost, and continuous cleaning smelting of the low-sulfur lead-containing secondary material and continuous harmless treatment of the iron-rich heavy metal solid waste are realized. The reduction sulphur-fixing bath smelting method has the advantages of changing harmful substances into beneficial substances, recycling waste materials, and being simple in process, environmental-friendly, and low in cost, and has important significance for continuous clean smelting of the low-sulfur lead-containing secondary material and the treatment and recycling of the heavy metal solid waste.

The invention discloses an iron diselenide/sulfur-doped graphene anode composite material for a sodium-ion battery and a preparation method of the iron diselenide/sulfur-doped graphene anode composite material. The preparation method comprises the following steps: dissolving a sulfur source, a selenium-containing inorganic matter, an iron-containing inorganic salt and citric acid or sodium citrate into a graphene oxide solution; dropwise adding hydrazine hydrate to form a light black solution, adding the light black solution to a hydrothermal reaction kettle for reaction, and naturally cooling the product after the reaction is ended; and carrying out repeated washing, suction filtration and drying on a reaction sediment with distilled water and absolute ethyl alcohol, so as to obtain the iron diselenide/sulfur-doped graphene composite material. According to the iron diselenide/sulfur-doped graphene composite material prepared by the method, iron diselenide nano-particles are evenly distributed on the surface of the sulfur-doped graphene and the iron diselenide/sulfur-doped graphene composite material has excellent electrochemical properties as a sodium-ion battery anode material. The iron diselenide/sulfur-doped graphene anode composite material is prepared by a simple hydrothermal process; synchronous sulfur doping, graphene oxide reduction and graphene oxide and iron diselenide recombination can be achieved; and the iron diselenide/sulfur-doped graphene anode composite material is simple in preparation technology and low in cost, and has a wide industrial application prospect.

The invention relates to a method for treating high-arsenic gold concentrate, which belongs to the technical field of metallurgy. Arsenic-resistant bacteria of the invention are arsenic-resistant thiobacillus ferrooxidant (CCTCCCNO: M2010072) which are obtained by breeding and domesticating thiobacillus ferrooxidant-containing high-arsenic gold concentrate acid mine pit water. The method for treating the high-arsenic gold concentrate by using the arsenic-resistant bacteria comprises the steps of expanding and culturing the bacteria, performing paste mixing on the high-arsenic gold concentrate, performing bacterial oxidation treatment, acidizing to remove arsenic, cyaniding to extract gold, recovering the arsenic and the like. Compared with the conventional method for pretreating high-arsenic gold ore, the method for treating the high-arsenic gold concentrate has the advantages of efficiently recovering noble metal gold, recycling the side product, namely arsenic, solving the environmental problem of high arsenic content of sewage and waste residues subjected to the bacterial oxidation process treatment, reducing the consumption of a cyaniding medicament, increasing the gold-extracting ratio of the high-arsenic gold concentrate and contributing to the environmental protection and the sustainable development of the huge-reserve high-arsenic gold concentrate in China.

Belonging to the technical field of contaminated soil remediation, the invention particularly relates to an improvement method of extremely acidified mine soil. The method utilizes an improving agentand a microbial agent to change the microbial community structure of soil, especially reduce the relative abundance of iron-sulfur oxidation acid production microorganisms and inhibit metal sulfide from oxidizing and producing acid. The improving agent can be utilized for adsorption, chelation, complexing and immobilization of heavy metal ions and reduction of the biological toxicity, thus reducing the diffusion and leakage of heavy metal ions to surrounding soil or water. The improvement method provided by the invention has the advantages of low investment cost, good acidification control andheavy metal stabilization effect, substantial increase of nutrient content, no destruction of the soil structure, and easy implementation.

The invention provides a denitrification functional filler, which comprises the following components in percentage by mass: 30-50% of an iron-carbon filler, 20-40% of scrap iron, 20-40% of sulfur and5-20% of biological active carbon. According to the invention, by using a novel autotrophic denitrification process of iron and sulfur, sludge production is low, the pH stability of a water body is maintained through a sulfur-iron coupling effect, and the problems of iron-based surface inert film generation and sulfur autotrophy alkalinity consumption in iron autotrophy are reduced; and the oxidation-reduction property of a biological active carbon functional group, and the conductivity, the high specific surface area and the biological activity of the main body are synchronously utilized, sothat the biomass in the system is improved, the denitrification efficiency of the system is improved, and finally the aims of reducing the operation cost and meeting the water quality requirement areachieved.

The invention relates to a method for the preparation of a sodium-based reactive desulphurizing agent for use in molten ferrous materials. The source of sodium in the reactive desulphurizing agent is a glass cullet, a composition comprising of at least Na₂O and SiO₂. In a second embodiment of the invention, the glass cullet reactive desulphurizing agent also comprises of an alkali or an alkaline material or other materials, such as oxides of calcium, aluminum and magnesium. Preferred raw materials for the oxides of calcium, aluminum and magnesium are, respectively, lime, alumina and dolomite. The premixed solid reactive desulphurizing agent is brought in contact with the molten ferrous material, allowing the desulphurization or the double replacement of the iron sulphur to take place and produce a ferrous oxide. The sodium in the reactive desulphurizing agent is rendered resistant to combustion or evaporation on contact with the molten ferrous materials by the flux activity of the silica. A metallic solid, such as aluminum, is introduced into the molten ferrous material to complete the reduction of the ferrous oxide.

The invention discloses a vulcanized nano zero-valent iron-acid activated montmorillonite composite material, and a preparation method and application thereof. The composite material is composed of spherical particles with nano zero-valent iron as a core and ferrous sulfide as a shell, is of a nano long-chain structure, has uniformly distributed and highly dispersed iron and sulfur elements, and has typical structural characteristics of silicate and zero-valent iron. The vulcanized nano zero-valent iron-acid activated montmorillonite composite material prepared by the invention is simple in raw material components, green, pollution-free and low in cost; and the product is convenient to transport and store. The prepared vulcanized nano zero-valent iron-acid activated montmorillonite composite material can be applied to in-situ remediation of soil polluted by various alkaline Cr (VI), the process is simple and rapid, the applicability is good, and the remediation effect is good.

The present invention discloses a method for safe production of rice on soil mildly and moderately polluted by heavy metals. The method includes applying a passivator before transplanting rice seedlings to reduce activity of heavy metals in soil, and then spraying a foliar barrier from the peak tillering stage to the booting stage of rice and at the filling stage of rice; the passivator includes bentonite, gypsum powder, lime, a biochar, an iron-based biochar, a slow-release iron-based biochar, an iron-sulfur-silicon composite biochar, a heavy metal cadmium passivator and a cadmium-arsenic synchronous passivator for activating sulfur reducing bacteria in paddy soil; and the foliar barrier includes an acid silica sol, a selenium-silicon composite sol, a cerium composite silica sol, a ferrous modified selenium sol. The method can also include applying a nitrate nitrogen fertilizer at the seedling stage of rice, and/or applying a phosphorus potassium fertilizer at the tillering stage of rice.

The invention relates to a method for biologically removing hydrogen sulfide and ammonia gas by steel sulfuric acid pickling waste liquor. The method comprises the following steps: filling filler subjected to culture and biofilm hanging by acidithiobacillus ferrooxidan thiobacillus in a biological oxidation tower, and carrying out acid pickling on divalent iron in the acid pickling waste liquor divalent iron so as to oxidize the divalent iron by the acidithiobacillus ferrooxidan thiobacillus to form ferric ion; removing the ammonia gas from a biological oxidation solution in a chemical absorption tower by means of the acidic absorption effect, oxidizing hydrogen sulfite by using the soluble ferric iron, reducing the soluble ferric iron into the divalent iron, converting the hydrogen sulfite into a simple substance, and converting the ammonia gas into ammonium radicals; and regenerating a reducing solution by adding a nutrient solution and recycling the reducing solution to a biological power. The method disclosed by the invention has the advantages that a nitrogen source is provided for microorganisms in the process of removing the ammonia gas and the hydrogen sulfide, the divalent iron is regenerated while the hydrogen sulfide is removed by oxidizing the ferric iron in the acid pickling waste liquor, thus the purposes of treating the wastes with wastes and recycling the wastes are achieved, and remarkable economic benefit and environmental benefit are realized.

The invention relates to a method for the preparation of a sodium-based reactive desulphurizing agent for use in molten ferrous materials. The sodium in the reactive desulphurizing agent is a sodium silicate, a composition comprising of Na₂O and SiO₂. In a second embodiment of the invention, the sodium silicate reactive desulphurizing agent also comprises of an alkali or an alkaline material or other materials, such as oxides of calcium, aluminum and magnesium. Preferred raw materials for the oxides of calcium, aluminum and magnesium are, respectively, lime, alumina and dolomite. The premixed solid reactive desulphurizing agent is brought in contact with the molten ferrous material, allowing the desulphurization or the double replacement of the iron sulphur to take place and produce a ferrous oxide. The sodium in the reactive desulphurizing agent is rendered resistant to combustion or evaporation on contact with the molten ferrous materials by the flux activity of the silica. A metallic solid, such as aluminum, is introduced into the molten ferrous material to complete the reduction of the ferrous oxide.

The invention discloses a passivator for repairing mercury-polluted soil as well as preparation and application thereof. According to an iron-sulfur-selenium loaded biochar material disclosed by the invention, ferrous sulfide and sodium selenite are taken as central substances, shaddock peel biochar subjected to anoxic high-temperature carbonization is taken as a carrier, and a method of loading iron-sulfur-selenium on biochar is adopted, so that the passivator for repairing mercury-polluted soil is prepared. The synthesized passivation material is added into mercury-polluted soil according to a certain proportion, standing is conducted for 30 days, the highest removal rate of TCLP and water leaching mercury in the mercury-polluted soil can reach 99% or above, and the exchangeable state, the carbonate binding state and the amorphous iron-manganese oxidation state in the soil are obviously converted into the organic binding state and the residue state. The iron-sulfur-selenium biochar material disclosed by the invention is simple in preparation process and low in cost, and can effectively reduce the mobility and bioavailability of mercury in soil.

The invention relates to a method for leaching low-grade gold in high-arsenic sulfur concentrate acid-making cinder by microorganism preoxidation, which has the main contents that bacterium preoxidation is utilized to leach the gold in the high-arsenic sulfur concentrate acid-making cinder, and the technology has the core that by taking various microorganisms, such as Thiobacillus ferrooxidans, sulfolobus and the like, under an acid condition, carbonate, sulfide, irony matter and part of silicate packing the gold are unpacked through oxygen in air, and are oxidized into sulfate, subsulphate or arsenate to achieve the goal of exposing the gold. After the gold is exposed, by taking the dilute sulphuric acid solution of thiourea as a leaching agent, under normal temperature and normal pressure, agitation leaching is carried out on pre-oxidized slag under the condition that the pH value is 1.3-1.8; 70-85 percent of gold is leached, and after solid-liquid separation is ended, a gold-contained solution can be extracted by using a traditional gold extraction process. The method of thiourea gold leaching after bacterium preoxidation has the characteristics that the toxicity is low; the solution in which the gold is removed is easy to treat, can be recycled, and can be produced by using a pollution discharge-free process flow; the gold and silver dissolution velocity is high; and the solution is not sensitive to the harmful impurities of base metals (Cu, As, Sb and Pb).

The invention discloses a preparation method of an iron-sulfur negative electrode material for a lithium battery. The method comprises the following steps of preparing a high-performance iron-sulfur compound at a proper vulcanization sintering temperature by adopting ferrite hollow spheres with a special micro-nano structure, so that the iron-sulfur compound with relatively high crystallinity canbe obtained, and a lithium-storage reaction is facilitated; through carbon-nitrogen compounding, the conductivity of the active substance is improved; and in addition, a cavity between a nitrogen-doped carbon layer and the iron-sulfur compound provides an effective space for volume expansion in an active substrate intercalation/de-intercalation lithium process, so that pulverization agglomerationof the iron-sulfur compound is prevented.

The invention discloses a method for promoting biological column leaching of poor chalcocite, particularly discloses a method for synergistically promoting biological column leaching of the poor chalcocite based on foreign intervention of compound sulfur oxidizing bacteria and the pyrite, and belongs to the technical field of bioengineering. 9K-chalcocite composite medium is used as a leaching solution, by adding a certain proportion of the pyrite and introducing a foreign compound sulfur oxidizing bacteria, various biochemical reactions in the leaching process are controlled, iron and sulfurmetabolism are promoted in the leaching process, and formation of an iron/sulfur passivation film is reduced; and the biological effect in the leaching process is strengthened by adding the compound sulfur oxidizing bacteria in batches, so as to make the copper ions leaching rate increase by 33.9%. The method is easy and convenient to operate, economical and reasonable, and is suitable for large-scale application of similar bioleaching processes.

The invention provides a preparation method of a platinum-rhodium alloy. The platinum-rhodium alloy is prepared from the following components in percentage by weight: less than 2.5% of iron, 0.020-0.060% of sulfur, less than or equal to 0.5% of silicon, 28.0-34.0% of platinum and the balance of rhodium; the preparation method of the platinum-rhodium alloy is characterized by comprising the following three steps: firstly, charging and vacuumizing; secondly, after the charged materials are completely melted, controlling the temperature within the range of 1300-1700 DEG C, refining and adding a deoxidizing agent; and finally, adding a sulfide so that the sulfur content in the platinum-rhodium alloy is within the range of 0.050-0.060%. The preparation method of the platinum-rhodium alloy has the advantages that the properties of the platinum-rhodium alloy are improved, and when the platinum-rhodium alloy is applied to the field of temperature sensors as the basic material of a thermocouple, the platinum-rhodium alloy is stable in properties and more advantageous to the accuracy of temperature detection, and therefore, the measurement accuracy can be improved.

The invention provides a preparation method of a phase-change type LiFeSO4F cell material stable at high temperature, an electrode plate, and usage of a lithium ion cell. The preparation method of the cell material comprises the following steps of first, weighing one of the followings according to a stoichiometric ratio of FeSO4: i. iron source and sulfur source, and ii. iron-sulfur source, grinding and mixing, and calcining in an inert gas for 1-2 hours at 380-400 DEG C, so as to obtain FeSO4 pure phase powder; second, preparing LiFeSO4F powder: weighing, according to a stoichiometric ratio of LiFeSO4F, ferrous sulfate powder and lithium fluoride powder prepared in the first step, grinding to obtain Li-Fe-S-O-F precursor powder, wherein the molar mass of the lithium fluoride powder is 1-1.05 times that of the ferrous sulfate; and third, calcining mixed powder obtained in the second step in the inert gas for 0.75-2.25 hours at 450-500 DEG C, so as to obtain LiFeSO4F pure phase powder. In charging and discharging of the cell material prepared by the method, phase change from LiFeSO4F of a Triplite structure to LiFeSO4F(1-x)(OH)x of a Tavorite structure occurs, an obvious -3.2V voltage platform is formed, and cycle stability of charging and discharging at 20-60 DEG C is high.

The invention discloses a reductive iron-sulfur mixed colloid as well as a preparation method and application thereof. The colloid comprises a water-soluble organic polymer compound and a ferrous sulfide compound; the water-soluble organic polymer compound is one or two of polyacrylate and polymethacrylate. The reductive iron-sulfur mixed colloid provided by the invention has high passivation rateon heavy metals in sludge under different pH and organic matter conditions, and the passivation effect is remarkable and long-lasting. The preparation method disclosed by the invention is simple, practical, convenient and easy to implement, simple in process equipment requirement, green in process flow, free of secondary pollution, wide in raw material cost source and low in price, can be used for efficiently passivating polluted heavy metal sludge, and has good market application potential.

Certain embodiments of the present invention relate to methods and products for enhancing the rate of photosynthesis in a plant. In addition, certain embodiments relate to transgenic plants and progeny thereof which comprise an exogenous Rieske Iron Sulphur protein.

The invention discloses an ammonium perchlorate wastewater processing method, and the method comprises the following steps: obtaining an intermediate product hydrogen and volatile fatty acid through akitchen waste anaerobic digestion hydrogen and acid production stage; providing an electron donor and a carbon source for the process of reducing ammonium perchlorate by perchlorate reducing bacteriaby utilizing the intermediate product hydrogen and volatile fatty acid; reducing ammonium perchlor`ate into chloride ions by adopting a three-stage degradation combined process of hydrogen autotrophic reduction, organic acid heterotrophic reduction and iron/sulfur autotrophic reduction to reduce the concentration of the ammonium perchlorate wastewater and complete the processing of the ammonium perchlorate wastewater . According to the method, the removal effect of the ammonium perchlorate wastewater can be remarkably improved, meanwhile, generated biogas is used as clean energy for life andproduction, and the economic rationality and the process operability are remarkably improved.

The invention discloses a method for improving efficiency of leaching chalcopyrite from thiobacillus and belongs to the technical field of bioengineering. According to the method disclosed by the invention, on the basis of an improved Starkey-chalcopyrite composite culture medium, iron ions and ferrous ions are supplemented at the initial stage of culture and elemental sulfur is added at stages inthe bio-leaching process, various biochemical reactions in the leaching environment are regulated, chemical and biological factors in the bio-leaching process are enhanced, iron metabolism is promoted while sulfur metabolism is improved, and production of sulfur passivation films and iron passivation films is reduced, so that the leaching rate is improved. The method is simple and feasible in operation, and is applicable to large-scale popularization and application of similar bio-leaching processes.

The invention discloses an organic microbial fertilizer harmless to the environment. The organic microbial fertilizer is prepared from the following components: a compound microbial agent, straw, sludge, human and animal excreta, calcium oxide, ammonium polyphosphate, urea, calcium superphosphate and water. In order to reduce the content of heavy metals in the fertilizer, the thiobacillus ferrooxidans is used for domesticating the sludge, and bioleaching is combined, so that the obtained sludge is precipitated, and the content of the heavy metals is very low; the added calcium oxide can effectively kill harmful viruses in the fertilizer; organic matters in the fertilizer are converted through an aerobic denitrifying bacteria inoculant, so that organic pollutants in the fertilizer are reduced, and the nitrogen fertilizer content of the fertilizer is increased. The organic microbial fertilizer is harmless to the environment, effectively treats sludge, straws and other organic wastes harmful to the environment, and is environment-friendly and safe.

The invention belongs to the technical field of chemical engineering and particularly relates to an attapulgite clay reduction-magnetic separation coupling continuous iron removal, whitening and purification method. According to the invention, a reduction reaction-magnetic separation coupling method is adopted, the particle size screening, grinding pulping and acid leaching impurity separation arecarried out on natural attapulgite clay; under the condition of controlling the pH value, Fe2+ and Fe 3+ in a solution are reduced and replaced by using a reducing agent, reduced iron elementary substance in an attapulgite clay slurry is continuously removed through magnetic separation, so that the purpose of removing impurities is achieved. Acidic water filtered after magnetic separation can berecycled as raw material water, so that the iron removal efficiency of the attapulgite clay is improved while the discharge of acidic wastewater is avoided. The method can effectively remove free iron, sulfur, phosphorus and other impurity minerals, the original crystal structure is not destroyed, and the method has the advantages of simple process, no waste acid discharge, high process automationand continuity degree and environment friendliness and is convenient for industrial production. The effective and high-value utilization of attapulgite clay resources can be promoted.