39results about How to "Increase the speed of the reduction reaction" patented technology

The invention belongs to the chemical field, in particular to a method for producing vanadium trioxide, aiming at improving the reaction speed of the method for producing vanadium trioxide and providing a solution as follows: A. raw material preparation; B. reduction of the prepared raw material by using reducing gas; and C. obtaining vanadium trioxide after reduction. The improvement of the method in the invention is that the used raw material in step A is composed of binder, carbon powder and vanadium-containing material, wherein the vanadium-containing material is ammonium vanadate or vanadium pentoxide. The invention adopts the technologies of carbon-proportioning and pellet preparation aiming at the raw material to enable the raw material to react in a gas-solid bi-phase reducing agent formed by solid carbon powder and reducing gas, thus improving the reduction reaction speed, enhancing recovery rate of the vanadium, and reducing consumption of the reducing gas. The produced pellet has the advantages of improving reaction speed, avoiding and reducing volatilization of vanadium-containing powder material, protecting environment and being beneficial for labor protection.

The invention relates to a method for reducing granular ferronickel through laterite-nickel ore in a two-stage rotary kiln. The method comprises the steps of adding a drying agent to laterite-nickel ore containing adsorption water, uniformly stirring and mixing, dehydrating and drying; crushing a mixture, adding a reducing agent and a granular ferronickel additive, uniformly mixing, and carrying out reduction roasting in a first stage of rotary kiln; and carrying out smelting reduction on materials subjected to reduction roasting in high temperature in a second stage of rotary kiln, and quenching, cooling, crushing, ball-milling and magnetically separating the materials subjected to reduction roasting to obtain the high-grade granular ferronickel. The method is simple in production, convenient to operate, low in energy consumption, low in cost and high in nickel recovery rate, and the produced ferronickel particle can be directly used as a high-quality raw material for smelting stainless steel. The method is applicable to laterite-nickel ores differing in grade and type.

The invention relates to a coal gasification method, in particular to a coal gasification method in which oxygen enriched air, CO2 smoke and steam are used as gasification agents. In the method, the CO2 smoke is led out from a combustion gas kiln furnace and pressurized and evenly mixed with the oxygen enriched air according to certain ratio to form the mixed gas richly containing O2 and CO2, wherein the O2 content reaches 30 to 50 percent, and the CO2 content reaches 5 to 25 percent; the mixed gas is mixed with vapor to be used as a coal gasification device; and in the coal gasification device, the gasification agents and coal are subjected to oxidation reduction reaction to generate coal gas in which CO and H2 are main combustible components. In the invention, the coal gasification reaction process is completed, and CO2 in the smoke exhausted by the kiln furnace is used as a reactive substance and is reduced to CO, thereby increasing the CO content in the coal gas, improving the calorific power of the coal gas, lowering the consumption of the gasified coal, reducing the emission of CO2 in the smoke exhausted by the combustion gas kiln furnace and achieving the effective composition of energy conservation and emission reduction.

The invention relates to the technical field of metallurgy and mineral engineering, and discloses a self-refluxing composite metallized pellet and a production process thereof. The self-refluxing composite metallized pellet comprises an inner core and an outer shell, wherein the inner core is formed by mixing iron ore concentrate, limestone, coal powder and cement in a proportion of 330:(300-350):(80-120):(6-9); the outer shell is formed by mixing iron core concentrate and bentonite in a mass ratio of 1320:(22-25), the grain size of the inner core is 20-25mm, and the thickness of the outer shell is 5-10mm. The production process for the self-refluxing composite metallized pellet comprises the following steps: preparing the inner core and packaging the outer shell to form a composite metallized pellet; packaging the composite metallized pellet with a reducing layer, distributing and drying the composite metallized pellet, reducing and roasting the composite metallized pellet, cooling and sorting the high-temperature reduced composite metallized pellet. According to the self-refluxing composite metallized pellet and the production process thereof disclosed by the invention, limestone is mixed into the inner core, and CO2 generated by heating and decomposing the limestone in a reducing process of the composite metallized pellet is used as an oxygen producer to participate in gasification reaction of the coal, so that CO concentration inside the pellet is increased, the reducing speed of the pellet is increased, and the energy consumption is reduced.

The invention provides a metallurgical melting reduction production method for titanium containing slag and belongs to the field of non-blast furnace ironmaking and resource comprehensive utilization. The metallurgical melting reduction production method comprises the steps that (1) vanadium containing slag or vanadium-titanium containing steel slag is added into a melting reaction device, reducing agents are sprayed into the melting reaction device while iron containing materials and/or vanadium-titanium containing materials are sprayed into the melting reaction device with oxidizing gas, reaction mixed slag is obtained, heated to be in a molten state and monitored in real time, and the situations that the reaction slag temperature is within the set range, and the reaction slag alkalinity CaO/SiO2 ratio is 0.6-2.0 are ensured at the same time through adjustment and control, so that the reaction slag is fully mixed, and reduced and oxidized slag is obtained; and (2) separating and recycling are conducted. According to the metallurgical melting reduction production method for the titanium containing slag, the recycling rate of metallic iron is 92%-96%; heat compensation is not needed or a small quantity of heat compensation is needed; the operability is high; the production cost is low; no solid waste is produced in the whole process; the reaction conditions are mild; energy saving and emission reduction are achieved; and the metallurgical melting reduction production method is an environment-friendly metallurgical process.

The invention discloses a magnesium smelting technique by microwave heating and relates to the field of magnesium smelting techniques. The upper end of the round wall of a furnace body is connected with an expander by bricklaying through a refractory material, and the lower end of the round wall of the furnace body is fixed with a tray; the expander is movably connected with a support in a sliding manner; the lower end of a microporous ceramic tube is fixed with the tray while the upper end of the microporous ceramic tube is fixed with the support; the furnace body is fixed with a microwave generator and a shell; the shell is fixed with an upper flange and a lower flange; a gaseous magnesium collecting chamber is formed by the wall of the furnace body above the support, an upper convergent section of the shell and the inner side of the upper flange; a gaseous magnesium outlet tube is penetrated from the gaseous magnesium collecting chamber and then is fixed with the furnace body and the shell; a slag chamber is formed by the wall of the furnace body below the tray, a lower convergent section of the shell and the inner side of the lower flange; a magnesium ball is put in the microporous ceramic tube; slag is put in the slag chamber; the power of the microwave generator is 1-500KW, the frequency of the microwave generator is 300-3000MHz, the temperature of the microwave generator is 1200-1350 DEG C, and the smelting time is 15-60 minutes; the magnesium ball is acquired by roasting dolomite to acquire magnesium oxide and calcium oxide and then mixing silicon iron and fluorite with magnesium oxide and calcium oxide. The magnesium smelting technique by microwave heating is used for smelting magnesium, which is a microwave new energy heating technology.

The invention provides a refractory iron ore dry grinding-suspension roasting integration technology and device. The refractory iron ore dry grinding-suspension roasting integration technology comprises the following steps of: breaking powder iron ores by a roller press, carrying out ore grinding by a dry-type ball grinder or the roller press, fluidifying to generate fine powder gas-solid two phase flow, then introducing the fine powder gas-solid two phase flow to a raw material cyclone collector for gas-solid separation in a suspension magnetic roasting technology, introducing middle-temperature flue gas discharged by the suspension magnetic roasting technology to a dry-type ore grinding technology for fluidifying, separating to obtain iron ore powder, carrying out oxidizing roasting on iron ore powder in a suspension magnetizing roasting main furnace, preheating coal gas to 450-500 DEG C by using burnt gas discharged by the oxidizing roasting in the suspension magnetizing roasting main furnace, entering a magnetizing roasting furnace so as to carry out iron ore reducing roasting, carrying out indirect heat exchanger cooling on roasted ore produced after reducing coasting to obtain roasting ore with the relatively high magnetism by using a suspended bed supercharger and a fluidized bed. The refractory iron ore dry grinding-suspension roasting integration technology has short technological process, does not consume water, consumes little coal gas, is low in cost, reduces the carbon emission, improves environments and improves economic benefits.

The invention relates to a pidgeon method magnesium deoxidization catalyst and the magnesium deoxidization method by adopting the catalyst. The catalyst consists of the magnesium fluoride, molybdenum oxide and calcium chloride which are matched according to the mol ratio of 1:( 0.01- 0.5) : ( 0.5- 1.5). The magnesium deoxidization method includes the steps that: 1) the preparation of the catalyst: after uniformly mixed according to the mol ratio, the magnesium fluoride, molybdenum oxide and calcium chloride are heated and melted under the temperature ranging from 850 DEG C to 950 DEG C and are poured, cooled and crushed, less than 200 grids; 2) the calcining-white, ferrosilicon and the catalyst are mixed according to the weight ratio of 100:(19- 21):(2- 5), pressed into bulks and arranged in a deoxidization tank for high-temperature vacuum deoxidization. The process conditions of the vacuum deoxidization are the same as the conditions of the pidgeon method. By adopting the invention, the deoxidization time can be shortened by 3 hours through 5 hours, and the deoxidization efficiency of the magnesium can be improved by 2 percent through 8 percent.

The invention provides a Cu/ZrO2 catalyst as well as a preparation method and use of the Cu/ZrO2 thereof. According to the preparation method, a Cu/ZrO2 precursor is reduced in alkaline and medium temperature environments by virtue of hydrazine hydrate, the alkaline environment is beneficial to the reducibility of hydrazine hydrate, and the medium temperature environment is beneficial to the acceleration of reduction reaction. By controlling the use amount and reduction time of hydrazine hydrate, the reduction degree of the catalyst is controlled; and by adding ice water, the reduction reaction can be rapidly terminated. According to the preparation method, the Cu/ZrO2 catalyst is prepared in the alkaline and medium temperature environments by virtue of hydrazine hydrate, Cu in the catalyst has three valence states including Cu<0>, Cu<+> and Cu<2+> in a molar ratio of 1 to (0.20-0.35) to (0.01-0.06), and the performance of the catalyst is excellent. The preparation method has the beneficial effects that the time is short, the energy consumption is low, and the reduction degree of the catalyst can be effectively controlled; and the yield of iminodiacetic acid salt prepared from diethanol amine through the catalysis Cu/ZrO2 exceeds 98%, the shortest reaction time is 2.3h, and the Cu/ZrO2 catalyst has good industrial application prospects.

The invention discloses a method for producing powdered rock phosphate pellets from low-grade powdered rock phosphate, and the method comprises the following steps: screening, proportioning, mixing, briquetting, drying and cooling; the proportioning procedure comprises the following steps: adding 1-10 parts by mass of phosphoric acid, 0.5-2 parts by mass of silicon phosphate, 5-10 parts by mass ofcarbonaceous reducing agent, 5-10 parts by mass of silica powder and 1-5 parts by mass of rice hull ash into every 100 parts by mass of powdered rock phosphate. The method is simple in process, easily available in raw materials, high in pellet strength and thermal stability and high in utilization rate of low-grade ground phosphate rock, has better economic and social benefits, and is easy to popularize and use.

The invention discloses a pulverized coal fired boiler hearth provided with a variable-section combustor area and adapting to flexible peak shaving and belongs to the field of boilers. The heath section area of different combustor layers is not completely the same, the hearth section in the combustor area is gradually enlarged in the flue gas flowing direction, and the specific value of the section area of a section-variable segment of the hearth and the section area of the part, corresponding to a downstream combustor of the hearth, of the hearth ranges from 0.75 to 0.95. The pulverized coal fired boiler solves the above problem existing in a conventional pulverized coal fired boiler hearth type, especially, the single-mill stable combustion capability is achieved, single-mill stable combustion can be achieved on the boiler, and the 20% BMCR oil-feeding-free stable combustion capability is achieved.

The invention relates to the technical field of organic medicine synthesis, particularly to a preparation method of dihydroartemisinin. According to the invention, sodium borohydride is used as a strong reducing agent to quickly and effectively reduce artemisinin, and a suspension chemical reaction system is established by increasing the stirring speed in a mixing process, so that the heat of thereduction reaction can be quickly dissipated, the reduction reaction speed is increased, the generation of byproducts is effectively inhibited, and the yield and the purity of the product are improved; the preparation method provided by the invention is simple and convenient, saves a large amount of solvents, electricity and heat, shortens the production period and reduces the production cost; andaccording to the embodiments, by adopting the preparation method provided by the invention, the yield of dihydroartemisinin can be up to 110%, and is significantly increased compared with the traditional preparation process, and the preparation method is suitable for large-scale production.

The invention discloses a catalyst, device and method for catalytic reduction treatment of aerospace propellant production sewage, the catalyst comprises an iron base material with an oxidation film removed from the surface and metal copper particles deposited on the surface of the iron base material based on chemical plating, and the iron base material and the metal copper particles on the surface of the iron base material are subjected to surface modification and are partially in an oxidation state. The device comprises a filter bed reactor, a catalyst filled in the filter bed reactor, a water pump for lifting sewage to the filter bed reactor, and a circulating water pump for circularly lifting the sewage in the filter bed reactor. According to the method, the aerospace propellant production sewage is subjected to reduction treatment by using the device. The iron-copper composite catalytic reduction system is formed through chemical plating and oxidation modification, the contact area is large, the adhesive force is high, the copper consumption is small, equipment is simple, operation and management are convenient, other energy consumption is avoided except for power consumption of a water pump, the catalytic activity is higher, the reduction reaction rate is high, and secondary pollution is avoided; the method is very suitable for treatment of aerospace propellant production sewage.

The invention discloses a reduction method of methanol synthesis catalyst. The reduction method comprises the following steps: conveying hydrogen from a gas storage tank of a hydrogen drainage and irrigation vehicle to a hydrogen depressurizing valve of the hydrogen drainage and irrigation vehicle to depressurize; conveying hydrogen after the depressurizing treatment to a synthesis gas compressor through a general hydrogen supplementing pipe to boost; conveying the synthesis circular gas containing hydrogen and nitrogen to a nitrogen inlet of the synthesis gas compressor so as to mix with the hydrogen after the boosting treatment, wherein the volume percent of every component in the synthesis circular gas is: 0.3-0.5% of hydrogen and 99.5-99.7% of nitrogen; conveying the mixed gas to a catalyst bed layer of a methanol synthesis reactor through a gas conveying pipe to participate in the reduction reaction. By adopting the technical scheme of the invention, the reduction reaction speed is accelerated, the reaction time is saved, and working efficiency is improved; the system is completely and stably ran without a series of assistant systems and the gas required by reduction is supplied, and thus cost is saved.