270 results about "Iron reduction" patented technology

The invention discloses an advanced treatment process of paper-making wastewater. The process comprises the following steps: introducing the paper-making wastewater after being subjected to secondary biochemical treatment into a micro-aeration iron reduction bed, backfilling iron chips in the micro-aeration iron reduction bed, and carrying out reducing reaction to the paper-making wastewater in the micro-aeration iron reduction bed; introducing effluent water after being processed according to step one into a coagulation basin, and adding a coagulating agent and a coagulant aid to the coagulation basin, so as to promote grains in the water to be agglomerated; introducing effluent water after being processed according to step two to a sedimentation tank for sludge separation; introducing the effluent water in the sedimentation tank into a filter basin for being filtered; introducing the effluent water filtered after being sterilized and disinfected into a reusing water pipe network; introducing sludge in the sedimentation tank and back washing blow-off water in the filter basin into a sewage thicker, and outwardly transporting the sludge and the back washing blow-off water after being dehydrated for disposal; and meanwhile, introducing dehydrate filtrate solution and overflowing liquid in the sewage thicker into the coagulation basin for re-treatment. The process has the advantages of simple process, good decoloration effect and cheap cost.

The invention belongs to the technical field of environmental organisms, and relates to paracoccus denitrifican with heterotrophic denitrification, autotrophic denitrification and iron reduction functions and a culturing method and an application thereof. The bacterium is paracoccus denitrifican ZGL1 with the collection number CCTCC M2012158, and can be used for completing heterotrophic denitrification and autotrophic denitrification processes (including sulfur autotrophic denitrification and iron autotrophic denitrification) and effectively reducing ferric iron. During waste gas treatment, reduction of Fe(II)EDTA-NO and regeneration of Fe(II)EDTA are realized simultaneously for the same strain in a BioDeNOX denitration process, the aim of continuously denitrating is fulfilled, and low energy consumption, small investment and low running cost are realized. During waste water treatment, the strain can be used for removing nitrate and nitrite from waste water in a heterotrophic denitrification process, can be applied to waste water denitrification through sulfur autotrophic denitrification and iron autotrophic denitrification processes, is low in cost, and has a simple process.

The present invention relates to a method of producing direct reduction iron with self-produced reduction gas of iron ore-coal pellet. With the coal in the iron ore-coal pellet as the whole reducing agent, the gas generated by self-pyrolysis of the coal in the iron ore-coal pellet as the self-produced reduction gas and the low heat value gas as the fuel heating the reduction gas, the self-produced reduction gas is recycled and reduces the iron ore into direct reduction iron in reducing atmosphere at high temperature. The present invention replaces the external reduction gas with the self-produced reduction gas facilitating zero release of greenhouse gases in the production of direct reduction iron and the realization of clean production.

The invention discloses a method for repairing heavy metal contaminated soil by combination of biochar and an iron-reducing bacteria agent. Adsorption of the biochar and oxidation-reduction of iron-reducing bacteria are fully exerted, and the bioremediation process of the heavy metal contaminated soil is greatly accelerated by the synergistic effect. An organic waste for preparing the biochar disclosed by the invention is wide in source, and low in cost; the iron-reducing bacteria agent is simple in preparation method, aeration facilities do not need to be added in the soil repairing process by the anaerobic metabolism ability, and operation is facilitated. The method for repairing the heavy metal contaminated soil by combination of the biochar and the iron-reducing bacteria agent has the advantages of a bioremediation technology, is outstanding in heavy metal fixing, passivating and ageing effects, and has a good application prospect.

The invention discloses the preparation method of 2,6-dichlorofluorobenzene, which comprises the following steps: preparing 3,5-dichloro-4-fluoroaniline from 3,5-dichloro-4-fluorobenzonitrile by iron reduction or catalytic hydrogenation; and replacing diazo group in 3,5-dichloro-4-fluoroaniline by hydrogen in the presence of a reducing agent to obtain 2,6-dichlorofluorobenzene. The method can prepare 2,6-dichlorofluorobenzene by a reasonable process, and has the advantages of simple and easy reaction process and high yield of the product. Additionally, 3,5-dichloro-4-fluoroaniline can be selected from (1) 3,4-dichloronitrobenzene rectification residues from combined production or byproduct of 3,4-dichloronitrobenzene; (2) rectification tailings of 2,3,4-trifluoronitrobenzene; and (3) rectification residues of 3-chloro-4-fluoronitrobenzene. Accordingly, the materials can be easily obtained to fully utilize the resources and reduce the production cost.

The invention relates to the field of metallurgy waste residue treatment, particularly relates to a modification technology of iron reduction and component reconstruction for molten slag, comprising the following steps: adding a modified material in molten slag, wherein the modified material comprises coke and SiO2, the weight ratio of coke to SiO2 to the molten slag is 0.08-0.12:0.10-0.12:1; heating up the molten slag after mixing to 1500-1700 DEG C; after fully reaction of the modified material and the molten slag, separating molten iron from the molten slag, and then discharging the molten iron. The technology has simple process, is a short flow technology of modification and regeneration of resources, has no need for new devices, can be used directly in on line production, is a supplement for existing steel smelting technology, and only needs auxiliary production technologies.

The invention relates to a system device and method for modifying coke oven gas to directly reduce iron ore, and belongs to the technical field of non-blast furnace iron-making process. The invention provides a new process, the coke oven gas produced in the coking process is modified and reformed as hydrogen-enriched reducing gas (H2 and CO), and the hydrogen-enriched reducing gas is introduced into a shaft furnace to directly reduce the iron ore. The large quantity of hydrogen-enriched reducing gas required for direct iron reduction technology is provided by the invention, the obtained hydrogen-enriched reducing gas obtained by modifying is used for the direct reduction of the iron ore so as to effectively reduce the emission of carbon dioxide in the iron ore reduction process, the direct reduction is completely different from the path of directly reducing iron from the natural gas and suitable for the energy resource feature of China.

The invention discloses a ternary composite repairing agent, containing iron oxide, humus and reducing bacteria thereof, for in-situ remediation of organic pollution in soil and sediment. The repairing agent of the invention is prepared by carrying out fermentation enlarge culture on ferric reducing microorganism and mixing with iron oxide and humus uniformly. The microbial repairing agent of the invention can accelerate degradation of organic pollutants under an anaerobic condition and has good in-situ remediation effect on organic pollution soil and black and stink sediment. Raw materials are all natural substances and environment-friendly, and cause no secondary pollution. The microbial repairing agent of the invention is simply applied without excavating or disturbing original environment or oxygen, requires low work amount and small cost, and is apt to large-scale usage. The preparation method of the repairing agent of the invention can obtain a microbial repairing agent product simply and fast.

A method for simultaneously removing ammonia nitrogen and nitrate nitrogen from a water body is disclosed. The method includes subjecting the water body containing ammonia nitrogen and nitrate nitrogen to oxidation-reduction treatment by adopting an iron catalyst under functions of anaerobic ammoxidation microbes, iron autotrophic denitrification microbes and iron-reduction ammoxidation microbes.The iron catalyst includes one or a plurality of elementary iron, a ferrous compound and a ferric compound. The catalytic treatment is performed in an anaerobic environment. The anaerobic ammoxidationmicrobes, iron autotrophic denitrification microbes and iron-reduction ammoxidation microbes provide reaction functional microbes for anaerobic ammoxidation, iron autotrophic denitrification and iron-reduction ammoxidation, allow oxidation-reduction treatment of the ammonia nitrogen and nitrate nitrogen to be performed stably and continuously under the premise of not continuously adding the catalyst, and can completely convert the ammonia nitrogen and nitrate nitrogen into nitrogen without a byproduct. The method is free of secondary pollution.

The invention discloses a method for treating a cobalt intermediate product. The method for treating the cobalt intermediate product comprises the steps that S1, acid dissolution leaching is carried out, specifically, water is added to the cobalt intermediate product to prepare pulp, and sulfuric acid is added to the pulp during stirring for leaching, the cobalt intermediate product contains the following components: 26.90% of cobalt, 1.58% of copper, 3.99% of manganese, 1.62% of calcium, 4.09% of manganese and 5.09% of iron; S2, reduction leaching is carried out, specifically, hydrogen peroxide is added as a reducing agent for further leaching, and then filtering is carried out to obtain leaching liquid and leaching residue; and S3, iron removal is carried out, specifically, carbonate isadded to the leaching liquid to adjust the pulp, and then solid-liquid separation is carried out to obtain iron removal slag and iron removal liquid. The method for treating the cobalt intermediate product is simple in process and is realized through three steps of acid dissolution leaching, reduction leaching and iron removal. The hydrogen peroxide is adopted to reduce Co3+ which is difficult toleach in the leaching process, and the leaching of cobalt and the removal of iron can be quickly and effectively achieved without any environmental pollution, and the method for treating the cobalt intermediate product belongs to clean production. Compared with other commonly used reducing agents, the reagent cost of the hydrogen peroxide is lower in price, and the production cost is reduced.

The invention relates to reduction kiln equipment and a method for directly reducing iron and belongs to the technical field of direct iron reduction. The kiln equipment for directly reducing iron comprises a kiln roof, a combustion-supporting air pipeline, a gas pipeline, a burning nozzle, a material disc, a support seat, a bent seal, a kiln car, a combustion chamber, a material pool and a heat accumulation radiation chamber, wherein the combustion chamber is arranged between the kiln roof and the material pool, the side wall of the combustion chamber is provided with the burning nozzle, the combustion-supporting air pipeline, the gas pipeline and the burning nozzle are connected, the upper end of the kiln car is provided with the support seat for supporting the material disc, the space formed among the material disc, the support seat and the kiln car is the heat accumulation radiation chamber, and the kiln car is connected with a kiln through the bent seal. The method for directly reducing iron provided by the invention is carried out according to the following steps that: the kiln equipment is preheated, reduction agents of reduced materials are mixed and filled into the material disc of the kiln car, covering agents are flatly paved on the mixed materials through a material distribution machine, the kiln car is pushed into the kiln for reduction, and reduced iron products are obtained. The kiln equipment and the method have the advantages that energy sources are saved, the reduction time is saved, and the recovery rate of the reduced iron is high.

The invention discloses a method for synchronously separating iron, vanadium and manganese in vanadium extracting tailings. According to the method, the vanadium can be converted into soluble vanadate in the iron reduction process by adding sodium salt, and in other words, vanadium conversion and iron reduction are performed at the same time. Calcined ore is processed through water quenching, not only can heat of the calcined ore be fully utilized to reach needed leaching temperature, but also crushing and ore grinding loads can be reduced, and electric consumption is reduced. Then, the vanium enters a solution through ore grinding leaching; the iron and the manganese are separated through weak magnetic separation according to magnetic differences, and therefore the iron, the vanadium and the manganese can be synchronously separated. The method has the beneficial effects of being simple in technology, low in energy consumption and high in metal recovery rate; the vanadium extracting tailings can be efficiently utilized; and the method plays an important role in increasing the resource utilization rate of vanadium titano-magnetite.

The invention belongs to the technical field of environmental protection and especially relates to a method for pretreatment on industrial wastewater by nascent state ferrous iron reduction. The method is characterized in that acidic wastewater and zero-valent iron undergo a reaction in the presence of a catalyst to produce a large amount of high-activity nascent state ferrous iron and the acidity of the acidic wastewater is eliminated and a pH value of the acidic wastewater is improved; the high-activity nascent state ferrous iron and alkaline wastewater are mixed according to a certain ratio so that nascent state ferrous iron ions form a high-activity structural-state ferrous complex under alkaline conditions; through negative and positive ions and the catalyst in the wastewater, reduction performances of structural-state ferrous iron are improved; and through addition of a trace amount of an oxidizing agent, catalytic oxidation effects of residual ferrous iron are performed so that a ferrous iron structural form is changed and coagulating precipitation effects of ferrous iron are improved. The method realizes preparation of nascent state ferrous iron from acidic waste water, utilizes reduction effects of zero-valent iron and ferrous iron, realizes synchronous treatment on acidic wastewater and alkaline wastewater, realizes treatment of wastes with processes of wastes against one another and saves a treatment cost.

The invention discloses a high-concentration nitrobenzene wastewater pretreatment device and treatment method, belonging to the field of organic chemical industry wastewater treatment. The device and method solve the problems of high pretreatment difficulty, low treatment efficiency, high treatment cost, complex operation and the like in the existing high-concentration nitrobenzene wastewater treatment method. The pretreatment device is sequentially composed of a pH regulating tank, an integrated complete-mixing zero-valent iron reaction tank, a Fenton-like reaction tank and a flocculating settling tank. The integrated complete-mixing zero-valent iron reaction tank has high reduction treatment capacity for nondegradable organic matters, can not harden after long-term operation, and has the advantages of wide pH value range, low iron powder consumption, lower operating cost and simple operation. The Fenton-like reaction tank performs Fenton oxidation by utilizing Fe<2+> and H2O2 which are dissolved out by the integrated complete-mixing catalytic zero-valent iron reduction reaction, thereby lowering the pollutant concentration under economical conditions. Thus, the high-concentration nitrobenzene wastewater pretreatment method has the advantages of favorable treatment effect and lower operating cost, is simple to operate, and can stably satisfy the subsequent biochemical treatment requirements.

The invention belongs to the field of metallurgy and metallurgical equipment, and relates to a gas-based direct reduction iron method device and a method for rapidly reducing iron. The device of the present invention uses reducing gases such as H2, water gas, and coke oven gas as reducing agents for 140-325-mesh powdered iron ore to perform deep reduction deoxidation, decarburization, and desulfurization to realize gas-based reduction of iron. The invention can be used for deoxidation, decarburization, desulfurization and other treatments of copper powder, cobalt powder, nickel powder, tungsten powder, molybdenum powder and other metal powder materials. In addition to the deep reduction of ordinary iron ore powder, the device and method can also directly reduce ultra-pure iron concentrate powder or iron oxide scale into secondary reduced iron powder for powder metallurgy without the need for secondary reduction. The hot powder metallurgy powder after reduction is directly hot loaded and sent to the hydraulic press mold, and various mechanical parts and components are produced by hot rolling. This device is also suitable for coal-based direct reduction of DRI products.

The invention discloses an ozone-anaerobic iron reduction combined Fenton oxidation technology for sludge reduction. The technology comprises the following steps: part of iron-containing sludge produced by Fenton oxidation firstly undergoes ozone oxidation treatment so as to preliminarily decompose refractory organic matter in the iron-containing sludge into small molecular easily biodegradable organic matter; then, the small molecular easily biodegradable organic matter enters an anaerobic iron reduction reactor; degradability of organic components in the sludge is further improved in the anaerobic iron reduction reactor, and simultaneously under the action of anaerobic iron-reducing bacteria, the process of converting Fe<3+> in the Fenton iron-containing sludge to Fe<2+> is completed; and finally, solid-liquid products containing Fe<2+> after the reaction all return to the front end of the Fenton oxidation process so as to partially replace Fe<2+> added in the Fenton oxidation process. Sludge reduction of the system is realized, so as to save construction investment and operating cost.

This invention opens a hair iron reduction Cong Aeromonas and its applications. After a lot of inventors experimental study, and selected a hair iron reduction Aeromonas Cong, a reduction of humus and iron reduction activity. This reduction of citric acid to iron, ferric hydroxide, water iron ore, goethite three-valent iron; can restore humus and humus model of AQDS (anthraquinone 2 ,6 - disulfonic acid). Iron reducing gross Cong Aeromonas facultative anaerobic, the electronic spectrum for the broader use of this bacterium in the anaerobic oxidation conditions to the electronic donor: glycerol, glucose and sucrose.

The invention provides a sewage treatment method. The sewage treatment method comprises the following steps of filtering sewage by a first filter screen, reducing the filtered sewage by an iron reduction tank, carrying out acid-base neutralization by an acid-base neutralization tank, carrying out MRM molecular resonance, carrying out biodegradation purification, and standing for 24 hours in an after-treatment tank. The sewage treatment method realizes zero discharge of sewage. The sewage treatment method has a low cost, can be operated simply, does not adopt any chemical reagents in after-treatment, does not produce secondary pollution on the environment, and solves the problem that heavy metals and microbes in specialized laboratory sewage produced by the existing scientific research institutions and hospitals pollute and damage the environment.

The invention relates to a method for intensifying zero-valent iron reduction to remove pollutants. The method includes that an electric field is formed by applying direct current at an anode end and a cathode end respectively, and the zero-valent iron is fed into a reactor and reacts with the pollutants in water under a sufficiently mixed hydraulic condition, so that water purification is achieved. The method has the advantages that water purifying effects are effectively improved through coupling between electrochemical action and the zero-valent iron action, so that the defects of activity declining and zero-valent iron packed bed hardening due to corrosion and passivation of traditional zero-valent iron surfaces are overcome, and zero-valent iron utilization efficiency is improved substantially; the technical principle includes that the zero-valent iron is disposed in the direct-current electric field, and on the basis of conventional chemical corrosion of the zero-valent iron, the electric field intensifies electrochemical corrosion effect of the zero-valent iron, so that the electron donating ability of the zero-valent iron is enhanced, and the problems of corrosion layer deposition and treatment effect declining are effectively avoided. The invention further provides the reactor for implementing the method.

The extraction method of iron-vanadium-titanium ore, firstly, roasting is carried out to separate iron and titanium, titanium and vanadium are leached, iron is reduced and roasted, and the vanadium in the raw ore is extracted by adding industrial chemical additives, and processed into vanadium dioxide; , by adding industrial chemical additives, then extracting the titanium element, and processing it into titanium dioxide; finally, the raw materials are processed again, and chemical additives and reducing agents are added to increase the content of reduced iron powder to more than 95% (TFe). The beneficial effect of the present invention is that by adding industrial chemical additives and reducing agents, and then heating and processing, the grade of iron can be increased to more than 95% (TFe), which greatly improves economic benefits and reduces production energy consumption Cost, to achieve resource reuse, effective utilization, environmental protection and other technological leaps, greatly beneficial to human health and environmental protection.

The invention discloses a slow-release composite repairing reagent for treating persistant halohydrocarbons in soil and a preparation method of same. The preparation method includes steps of: 1) preparing microbial liquid saturated black charcoal; 2) preparing a colloidal solution A containing locust bean gum and an organic carbon source; 3) preparing a colloidal turbid liquid B containing the locust bean gum, organic carbon source, nano zero-valent metal, and the microbial liquid saturated black charcoal; 4) performing a crosslinking reaction for 2-6 h; 5) performing a delayed crosslinking reaction for 2-6 h to obtain the slow-release composite repairing reagent. By means of excellent adsorption performance of the black charcoal, high-effective chemical reduction effect of the nano zero-valent metal and dissimilatory iron reduction dehalogenation capability of functional microorganisms, the repairing reagent can achieve physical-chemical-biological synergistic reinforced repairing effect to the soil polluted by the persistant halohydrocarbons, and has advantages of long action period, stable structure, low cost and environment-friendly property.

The invention discloses a preparation method of red mud iron reduction furnace slag light foamed ceramic and an iron reduction furnace. A red mud iron reduction furnace is characterized by comprising an iron reduction furnace 1, a melting bath 2, a furnace slag melting bath 3, a molten iron melting bath 4, a feeding machine 5, a molten iron channel 6, a molten iron inlet 7, a furnace slag melt outlet 8, a furnace slag melt channel 9, a furnace slag melt feeding hole 10, a foaming agent inlet 11, a stirring machine 12, a float glass kiln body 13, a foaming section 14, a foam stabilizing section 15 and an annealing section 16; red mud is taken as a main material, and green coke precious stone, waste glass dust, quartz sand, coal gangue and titanium dioxide are added; and the ceramic consists of the following components in percentage by weight: 35-82.5 percent of red mud, 3-15 percent of green coke precious stone, 3-10 percent of waste glass dust, 1-15 percent of quartz sand, 10-20 percent of coal gangue and 0.5-5 percent of titanium dioxide. Industrial waste is taken as a major raw material, so that production cost is reduced, environmental pollution is lowered, and economic efficiency and environmental friendliness are realized; waste can be recycled; and a prepared red mud iron reduction furnace slag light foamed ceramic tile has high strength, high heat preserving property and high decorating characteristic.

The invention relates to the technical field of materials and discloses a method for alleviating nano zero-valent iron passivation. The method comprises the following steps: selecting at least one iron reduction microbe, culturing by selecting a proper culture medium, and ending culture while reaching the stable phase of the microbes; and adding the at least one iron reduction microbe screened in the step (1) into a reaction system of zero-valent iron reduced organic pollutants when the reduction activity of the nano zero-valent iron is less than or equal to 50% of the original activity. Compared with the existing method for alleviating zero-valent iron passivation, the method disclosed by the invention is environment-friendly, adopts ubiquitous iron reduction microbes in the environment and is simple in operation. In addition, the method disclosed by the invention is low in energy consumption, does not need extra energy and is capable of simultaneously achieving the effects of alleviating nano zero-valent iron passivation and promoting degradation of the pollutants.