196results about How to "Reduce restore time" patented technology

A method for rapidly reducing copper slags to produce iron-copper alloys in a kiln in a reducing atmosphere is characterized by including the steps: proportionally mixing the copper slags, reducing agents and additives, crushing or levigating the mixture to 200 meshes to obtain 20%-40% of residues on sieve; doping agglomerants and water occupying 5-20% of all materials on a dry mass basis, uniformly mixing, producing the uniformly mixed mixture to pellets with the diameters ranging from 15mm to 30mm and small cylindrical briquettes with all the heights ranging from 15mm to 30mm by a pellet press or a briquetting machine, and drying the pellets or small cylindrical briquettes; flatly laying the dried pellets or small cylindrical briquettes at the bottom of the kiln, wherein the material layer thickness ranges from 20mm to 45mm, the material layer reducing temperature ranges from 1250 DEG C to 1450 DEG C, and the reducing time is 10-40min; and subjecting the reduced pellets or the briquettes to cooling, crushing, wet grinding and wet separation so that iron-copper alloy powder with the iron recovery rate of 85%-99% is obtained. According to the method, iron in a great quantity of silicate iron in the copper slags, which cannot be separated out by the traditional technology, is extracted and turns into the iron-copper alloy micro powder with high added value so that iron and copper in the copper slags are extracted and used simultaneously, and physical and chemical heat energy in strong reducing waste gas can be completely recovered during rapid depth reduction.

The present invention relates to olefin processing technology, and is especially double active component Mn-Ag deoxidizer for deoxidizing olefin and its preparation process and application. The Mn-Ag deoxidizer has Mn3O4 as main active component and small amount of Ag2O catalyst capable of lowering the temperature and decreasing the time for reducing Mn3O4 into MnO possessing deoxidizing activity. The Mn-Ag deoxidizer has calcium aluminate carrier and no other adhesive, high active component content and high deoxidizing capacity, and possesses very high compression strength. The Mn-Ag deoxidizer may be regenerated through reduction at 80-160 deg.c, and can reduce oxygen content in ethylene, propylene, etc at room temperature to below 0.05 ppm. The Mn-Ag deoxidizer is applied in industrial polyolefin production, and has long regeneration period, capacity of preventing poisoning of polymerizing catalyst and low production cost.

The invention discloses a preparation process of a palladium electrode ion polymer and metal composite, which is used for preparing a palladium metal electrode IPMC (Ion Polymer Metal Composite) by using immersion reduction plating and chemical plating methods in which an ion exchange membrane is used as a matrix material and [Pd (NH3)4] C12 is used as a main salt. The preparation process comprises the following four main steps of: (1) pretreatment of the matrix membrane: carrying out roughening, surface cleaning, foreign ion removal and full swelling on the matrix membrane; (2) immersion reduction plating including two processes, i.e., ion exchange and ion reduction: subjecting a pretreated Nafion membrane to repeated palladium ion immersion and exchange, and reducing the pretreated Nafion membrane with NaBH4 by adopting ultrasonic waves to form palladium metals on the surface and the internal surface of the ion exchange membrane; (3) chemical plating: wherein the thickening electrodes on the outer surface of a core material to compact internal surface electrodes by using an improved chemical plating method; and (4) postprocessing of the composite. The preparation process has a higher popularization value due to relatively improved efficiency, relatively lower cost and excellent actuation response.

The invention relates to a comprehensive recovery method of iron, vanadium and titanium for vanadium and titanium magnetite concentrated ores, in particular to the comprehensive recovery and utilization of the vanadium and titanium magnetite concentrated ore of which the vanadium content is higher. In particular, the invention is vanadium extraction through water immersion after the vanadium and titanium magnetite concentrated ore is performed with sodium activation and sintered, the vanadium product is made from leach solution, the remaining slag is performed with reduction quickly through a rotary furnace after carbon is added, the reduction product is melted through the electric furnace, to segregate the melted iron and the titanium slag, the melted iron is used to make steel, and the titanium slag is used to produce white titanium pigment through a sulfuric acid method titanium white technology. The method of the invention is applied to the refining technology of the vanadium and titanium magnetite concentrated ore, to ensure that the recovery rate of the vanadium and titanium is greatly enhanced, the recovery rate of the total vanadium in the iron concentrated ore can reach more than 80 percent, titanium is fully recovered, and the production of massive blast furnace slag is avoided.

The invention discloses a method for quickly screening and detecting azo dyes forbidden in textile materials, leathers and dyes using gas chromatography mass spectrometry, which comprises the following steps: 1) preparing a sample, 2) subjecting the sample to reduction reaction, 3) extracting the sample, 4) performing the gas chromatography mass spectrometry on the sample, 5) screening decision: compared with the GC-MS analysis result of a standard solution, if the retention time and the mass spectrum of the aromatic amine in the sample keep with standards, the sample is judged as a suspicious positive sample, otherwise it is a negative sample and directly judged as a qualified sample. The sample pre-treatment time is shortened, the cost is reduced, the detection time is shortened, the operation step is simple, the operation is convenient, the operation time is short, the operation cost is low, the detection efficiency is improved; the aromatic amine in the sample is detected by a gas chromatography mass spectrometer, color interference problem is not existed, the sample matrix is effectively prevented from being infected, and the judgment accuracy is high, thus the method is not only suitable for textile materials, but also suitable for other products such as leathers and dyes.

The invention discloses single-dip pipe silicon iron bath vacuum circulated magnesium-smelting device and method. The device comprises an induction furnace (101), a vacuum reaction chamber (104), a single dip pipe (102) and an argon blowing pipe (110) with a side wall communicated with guided flows; and besides, the device also comprises a magnesium steam condenser (206), a magnesium liquid spray thrower (210), a magnesium liquid storer (202) and magnesium mining powder conveying and spraying devices (111)-(115), wherein the magnesium steam condenser (206), the magnesium liquid spray thrower (210) and the magnesium liquid storer (202) are communicated. The method comprises the following steps of: preparing silicon iron liquid with the silicon content of 30%-65% and the temperature of 1,350-1,600 DEG C, making the mixtures of the silicon iron liquid and magnesium mining powder blown into the silicon iron liquid annularly flow between a vacuum reaction device and the induction furnace at the vacuum degree of 350 Pa-10,000 Pa for reaction to generate magnesium steam, carrying out condensation and magnesium liquid spraying to the magnesium steam to generate magnesium liquid, making the magnesium liquid flow into a storing device, and then pouring magnesium ingots. The device has the advantages of energy saving, low consumption, high productivity and the like.

The invention discloses an artificial rutile preparing method through rock ilmenite concentrate, which comprises the following steps: preheating rock ilmenite concentrate in the rotary kiln to reduce directly; separating the corrosion of reduced ilmenite; immersing material with titanium in the diluted acid to remove impurity to prepare the artificial rutile.

The invention relates to a method in which hematite or limonite are quickly reduced and made into iron powder, which aims to use iron ore difficult to be magnetically separated as a raw material to reduce the cost. The method is characterized in that hematite ore or limonite ore are crushed and then washed and magnetically separated; iron ore powder, coal powder and lime powder are mixed according to the proportion, and calcium fluoride and adhesive are added to be pressed into flans with pores, and the flans are dried; the structure of a kiln car surface is improved, and a sagger is made; the pressed and dried flans are hoisted to the kiln car surface after being put orderly, and the sagger is covered outside the flans; a tunnel kiln is used for calcinating the flans, and two ends of the tunnel kiln are covered with air sealing machines; after the kiln car travels out of the tunnel kiln, a motor hoist is used to hoist the sagger, calcinating blocks are pushed into a water pool to be quickly cooled and automatically ground, and the iron powder and dregs are fished out to directly enter a ball mill to be wetly milled and be pressed into blocks or bagged after the separation of a magnetic separator and the drying.

The invention relates to a method for preparing metallized pellets by utilizing stannum-zinc-arsenic-contained complex iron ore, which comprises the following steps: proportioning stannum-zinc-arsenic-contained iron ore concentrate with a binder, evenly mixing and damp milling and then pelletizing; drying and dehydrating fresh pellets on a chain grating machine through air draft; roasting in a weak reducing atmosphere at low temperature to remove arsenic; roasting in an oxidizing atmosphere to remove sulphur; roasting in the weak reducing atmosphere at high temperature to remove stannum and zinc to obtain pre-reduced pellets; and filling the pre-reduced pellets into a rotary kiln to perform coal-based direct reduction roasting to obtain the metallized pellets (DRI- direct reduced iron). According to the method for preparing the metallized pellets by utilizing the stannum-zinc-arsenic-contained complex iron ore, the technology of thermally filling the pre-reduced pellets into the kiln is adopted, thereby, the reduction speed of the pellets in the rotary kiln is obviously accelerated, and the production rate is increased. Simultaneously, the stannum, the zinc and the arsenic in the stannum-zinc-arsenic-contained complex iron ore are selectively separated, thereby, large-scale processing and utilization on the stannum-zinc-arsenic-contained iron ore concentrate can be realized.

The invention relates to a coal-based direct reduction-melt separation furnace smelting reduction iron-making process using an external heating mode. Equipment used in the process comprises a pellet drying chamber, a distributing device, an external heating type reduction furnace and a melt separation furnace which are arranged from top to bottom. The process includes the steps that S1, carbon-bearing pellets are preheated and dried in the pellet drying chamber; S2, the carbon-bearing pellets in a reduction chamber are continuously and evenly heated, and the carbon-bearing pellets are quickly reduced in the reduction chamber; S3, high-temperature metallized pellets are obtained after the carbon-bearing pellets in the reduction chamber are reduced, and the high-temperature metallized pellets are charged into the melt separation furnace in a hot-delivery and hot-charging mode to be subjected to reduction smelting; S4, after the metallized pellets enter the melt separation furnace, the melting point, the viscosity and the separating effect of slag iron are controlled through the content of added flux and pulverized coal, reduction smelting of the metallized pellets is completed, and accordingly high-quality molten iron and high-temperature furnace slag are obtained. By the adoption of the process, iron ore which is low in grade and difficult to reduce is utilized comprehensively, the technological process is shortened, production cost is lowered, product quality is improved, and production efficiency is effectively improved.

The invention relates to a new technology for extracting high-purity gold by adopting a wet process, which comprises the following steps: melting gold in aqua regia; concentrating and removing nitrate; diluting and filtering; reducing and depositing; filtering and cleaning; and fusing ingot casting. In the step of reducing and depositing, SO2 is taken as a reducing agent; when the electric potential of the solution is 680-730mv, especially when the electric potential of the solution is 700mv, the introduction of reducing gas is stopped, so that the purity of the end product is kept above 99.999% and the once percent reduction of the product is higher. According to the new technology, the optimal reduction temperature is confirmed; when the reduction temperature is at 40-60 DEG C, optimal temperature is at 50 DEG C; and the reduction time is effectively shortened.

Disclosed is an aluminothermic reduction method and technology of giobertite calcination to produce magnesium which comprises using magnesite powder as raw material, aluminum powder as reducing agent, the invention is characterized in that, (1) charging 5-15 wt% calcined limestone powder (CaO) as adjuvant, (2) calcining magnesite powder at 700-1000 deg C for 1 hour to prepare active MgO, (3) mixing magnesite powder, limestone powder and aluminum powder by the weight ratio of 35-80:5-15:15-54, making into blocks under 40-450MPa, (4) loading the block into retort, evacuating and heating in reducing furnace, reducing 4-8 hours at 1050-1170 deg. C to obtain crude magnesium. The invention also discloses the optimum parameter for the process.

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 directly reducing laterite-nickel ore to produce a ferronickel alloy, belonging to the technical field of metallurgy and chemistry. The method comprises the following steps of: (1) mixing the raw laterite-nickel ore with a carbonaceous reducing agent and a compound additive, and grinding in a ball mill; (2) uniformly stirring the mixture obtained by the step (1), and pelletizing; (3) feeding the pellets obtained by the step (2) into a preheater for preheating to remove natural moisture, and directly feeding the preheated pellets into a silicon nitride bonded silicon carbide reducing tank for reduction; and (4) performing water quenching grinding on the reduced product obtained by the step (3), and performing slag-iron separation by use of a magnetic separator to obtain the ferronickel alloy. By adopting the method disclosed by the invention, the reducing time is shortened, the production cost is reduced, the production efficiency is improved, and a new high-quality raw material is provided for smelting high-class nickel alloy particles; meanwhile, the production cost is only 1/3 of that of a traditional technology; and the technology has the advantages of large-scale continuous production, high automation degree and short technological flow.

The invention discloses a reducing roasting method for powdered iron ores in a tunnel kiln, which is designed for solving the problems of low heat transfer efficiency, long reducing time, non-uniform material reduction quality, and the like when powdered iron ores are subjected to reducing roasting in a tunnel kiln. According to the invention, by reasonably selecting the particle size range and distribution of iron ores, iron ores with different particle sizes and reducing coal are mixed and distributed in layers, and then the obtained object is subjected to reducing roasting, so that the iron ores with different particle sizes achieve a same roasting effect, thereby increasing the metal recovery rate of roasted iron ores, improving the quality of roasting, shortening the roasting time, reducing the roasting temperature, and lowering the production cost.

A storage apparatus conducts, in a protection period, data protection processing for protecting, in a third logical volume, data stored in a first logical volume by using backup data stored in a second logical volume, and suspends the data protection processing in a no-protection period, during which backup relative to the second logical volume is suspended, in the protection period. Then, upon receiving an external order for restoring the first logical volume to its state as of at a time not in the no-protection period within the protection period, the storage apparatus restores the first logical volume to its state as of at a time of the order by using the data backed up in the second logical volume and the data protected in the third logical volume.

The invention relates to a QDF (quiescent direct furnace) direct reduction technology which comprises the following steps: uniformly mixing a metal-containing raw material and reducing agent powder, and putting into each reducing chamber, wherein in a reducing process, the reducing chambers and the reduced material are all kept in a stationary state; uniformly heating the materials in the reducing chambers by use of the heat generated by the combustion of the fuel in a combustion chamber and a combustion-supporting gas so as to perform a reduction reaction between the metal-containing raw material and the reducing agent, wherein each reducing chamber is a narrow long one-section reactor. According to the technology provided by the invention, the reducing chambers and the reduced material are all in a stationary state, the requirement on the strength of the granular raw material is reduced, and the production efficiency of a granulation process is improved; and the reducing time can be prolonged, and the metallization ratio of the reduction product is improved. The reducing chamber is not provided with a preheating area or a cooling area, the temperature is uniform, the atmosphere is uniform and consistent, and the overall quality of the reduction product is improved. The direct reduction technology has remarkable advantages of wide application range of raw materials, uniform temperature field, easy control on reduction process, high product metallization ratio, high yield and the like.

The invention provides a method for preparing high-quality reduced graphene through high-energy-pulse microwave rapid recovery. The method comprises the main steps that crystalline flake graphite is added into fuming nitric acid under ice-water bath, hydrogen peroxide is added for a reaction for a certain time, washing and drying are conducted, and expanded graphite is obtained through microwave puffing; the expanded graphite and potassium permanganate are sequentially added in a mixed-acid system of 0-DEG C concentrated sulfuric acid and phosphoric acid, the strong oxidizing performance of the potassium permanganate is used, and the graphene is oxidized into graphene oxide under the low temperature of 0 DEG C; the graphene oxide is placed in a tube furnace to be subjected to insulation treatment, and pre-reduced graphene oxide powder is obtained; and finally, the pre-reduced graphene oxide powder is placed in a high-energy-pulse microwave cavity, microwave is opened, and a high-quality reduced graphene product is obtained. According to the high-quality reduced graphene prepared through the method, the lamellar structure is complete, the reduced graphene finally obtained through high-energy-pulse microwave rapid recovery is high in quality, and a good foundation is provided for preparation of graphene oxide, and graphene-based nanocomposite materials.

The invention provides a method of preparing tungsten-doped superfine yttrium oxide compound powder by freeze drying. The method comprises the following steps: dissolving ammonium metatungstate and ayttrium nitrate hexahydrate in deionized water or distilled water, and carrying out ultrasonic treatment to disperse and dissolve the mixture to prepare a solution; pouring the solution into a surfacevessel or other containers large in surface areas, putting the surface vessel or other containers in a refrigerator, and pre-freezing the same at 40 DEG C below zero and 10 DEG C below zero; openingrefrigeration and a vacuum meter of a freeze drier in advance, and after the temperature of the freeze drier is reduced to the freezing temperature of 58 DEG C below zero and 20 DEG C below zero and is stabilized, putting the pre-frozen surface vessel in the freezer dryer, and opening a vacuum pump to maintain the vacuum degree and carry out freeze drying; putting the freeze-dried compound powderin a tubular furnace, and calculating the compound powder in a nitrogen or an argon air flow to obtain WO3-Y2O3 compound oxide powder; and carrying out two-step reduction with pure hydrogen in the tubular furnace to obtain the tungsten-doped superfine yttrium oxide compound powder. The average grain size is about 10nm, the grain size distribution is extremely narrow, and a bimodal distribution phenomenon is avoided.