2074 results about "Roasting" patented technology

The invention relates to a method for recycling vanadium and molybdenum from a waste petroleum catalyst, and belongs to the technical field of petrochemical industry. The method comprises air-burning and ball-removing, ball-milling, soda roasting-water leaching, aluminum removing, molybdenum precipitating and enriching molybdenum by ion exchange. The method specifically comprises the following steps: firstly, igniting sticky oil in the waste catalyst in air to burn carbon and oils in the waste catalyst; then, oxidizing the vanadium and nickel in the forms of porphyrin compounds in the waste catalyst into vanadium oxide and nickel oxide, converting most of the molybdenum into molybdenum oxide, wherein the waste catalyst subjected to air-burning and oil-removing is more beneficial for crushing, and the crushed waste catalyst and a certain proportion of sodium carbonate are mixed, and are roasted at a high temperature; leaching roasted materials by hot water, dissolving sodium salts of the vanadium and the molybdenum into water to obtain a solution, filtering the solution, introducing the filtered solution into a leaching solution, introducing a little aluminum into the leaching solution, regulating the pH value of the solution to remove aluminum; regulating the pH value of the solution to 8-9, adding ammonium chloride, precipitating and separating out the vanadium in the form of ammonium vanadate; and concentrating vanadium-precipitated solution by adopting an ion exchange process and enriching an ammonium molybdate solution.

The invention relates to an environmental-friendly comprehensive utilization method for a laterite-nickel ore, which comprises the following steps of: (1) grinding the laterite-nickel ore, mixing with sulfuric acid, roasting, dissolving out roasted clinker and filtering to obtain silicon dioxide and dissolution liquid; (2) deironing the dissolution liquid to obtain liquid No.2 and filter residue (iron compounds), wherein the liquid No.2 comprises aluminum, nickel and magnesium and can be treated by the step (3) or (4); (3) precipitating the aluminum in the liquid No.2 by using alkali, filtering, precipitating the nickel in filtrate by using sodium sulfide, filtering, precipitating the magnesium by using the alkali, and treating filter residue to obtain aluminum oxide, nickel hydroxide, nickel sulfide and magnesium oxide respectively; and (4) precipitating the aluminum and the nickel in the liquid No.2 by using the alkali, treating mixed slag containing the aluminum and the nickel by using the alkali to obtain aluminum hydroxide and nickel hydroxide products, and precipitating the magnesium in filtrate subjected to aluminum and nickel precipitation by using ammonia or ammonium saltto obtain a magnesium oxide product. The method is suitable for treating various laterite-nickel ores, three wastes (waste gas, waste water and waste residue) are not generated, and valuable components magnesium, nickel, iron, aluminum and silicon in the laterite-nickel ore are separated and extracted.

The invention relates to a method for extracting aluminum oxide from fly ash based on an ammonium sulfate activation process. By adopting roasting of the fly ash and ammonium sulfate, combined impurity removal and a two-section fluidized roasting system, the problem of high corrosion of equipment in the background technology is solved; a process chain of a main flow is shortened; through the roasting system, the roasting process is low in energy consumption, economic and low in cost by using methods such as two-section cyclic fluidized roasting and dense phase transportation; and the technical problem of material melting, wall sticking, caking or ring forming is solved.

The invention relates to an ultra-deep absorption desulfurizer for light oil and an application thereof. The desulfurizer comprises 10.0-80.0% of zinc oxide, 5.0-75.0% of VIII metal oxide, 1.0-50.0% of adsorption assistant, 1.0-10.0% of pore-expanding agent and 10.0-35.0% of adhesive. The method for making the desulfurizer comprises the following steps: uniformly mixing, pressing to obtain sheets or squeezing to obtain strips, drying and roasting. The absorption desulfurizer does not use noble metals, thereby having the advantage of low price; the invention adopts mixed roasting technique, thereby having the advantages of simple preparation method and easy operation; the desulfurizer has the advantages of high desulfurization activity and favorable regeneration effect, and can be used for processing low-sulfur light oil; the content of sulfides in the processed light oil can be reduced to below 0.5 ppm; and the desulfurizer is suitable to be used in the low-temperature fine desulfurization process of naphtha, gasoline, diesel, aviation kerosene and the like.

The invention relates to an Mg/Al hydrotalcite modified charcoal composite material and a preparation method and application thereof. According to the composite material, charcoal is used as a substrate, and roasted Mg/Al hydrotalcite is loaded on the surface of the substrate. The preparation method comprises the specific steps that biomass powder is soaked with an Mg/Al water solution at first, then, a composite of Mg/Al hydrotalcite and biomass is prepared, and finally the composite of Mg/Al hydrotalcite and biomass is pyrolyzed through a tubular atmosphere furnace in N2 atmosphere to obtain the product. In the preparation process of the Mg/Al hydrotalcite modified charcoal composite material, biomass pyrolysis and hydrotalcite roasting are carried out in one heat treatment process, the preparation cost is reduced, and the preparation time is shortened. The structure of the roasted Mg/Al hydrotalcite can be partially recovered to be hydrotalcite of an orderly stratified structure after the roasted Mg/Al hydrotalcite makes contact with the water. The Mg/Al hydrotalcite modified charcoal composite material has the good adsorption effect on dye in waste water.

The invention provides a difficult-separation iron ore tailing pelletizing rotary kiln magnetic roasting treatment technology. The technology mainly comprises the following technological steps: 1, carrying out magnetic separation enrichment of iron ore tailing by a strongly-magnetic magnet separator having a field intensity of 0.6-1.2T; 2, uniformly mixing an obtained enriched tailing with coal dust and a binder according to a ratio of 100:0.5-2:1-3, drying, carrying out damp milling treatment, and pelletizing; 3, drying pellets obtained in step 2; 4, carrying out the magnetic roasting of dried pellets by adopting a rotary kiln; 5, cooling the magnetically-roasted pellets in a water quenching mode; 6, milling the cooled pellets; and 7, carrying out magnetic separation of ground ore powder to obtain iron ore concentrate. The technology allows the iron ore concentrate having a TF2 grade of about 56% can be obtained, increases the metal recovery rate to above 75% from original 65-70%, improves the resource utilization rate and reduces the environmental pollution.

The invention discloses a method for preventing pellets from high temperature reduction bonding in a high phosphorus oolitic hematite treatment shaft furnace, belonging to the technical field of direct-reduction ironmaking. High phosphorus oolitic hematite powder, pulverized coal, a dephosphorization agent and a bonding agent are mixed together according to a proper ratio, the mixture is milled and pressed into balls so as to prepare cold bound pellets, and the bound pellets are dried or maintained and are further conveyed into a direct-reduction shaft furnace; in the direct-reduction shaft furnace, the pellets are subjected to hot coal gas roasting, gas-based prereduction, coal-based direct reduction and cooling process from top to bottom, temperature range of gas-based prereduction and coal-based direct reduction for the bound pellets is 850-1200 DEG C, and standing time in the shaft furnace is 1-5 hours; the reduction gas comprises H2 and CO in a ratio of 1.2-4; the reduced pellets are sealed and cooled, at the outlet of a cooling section, temperature of the bound pellets is controlled to be 100-200 DEG C, and the bound pellets are further smashed, magnetically separated and briquetted, wherein TFe in the obtained iron product is not less than 88%, and phosphorus content is less than 0.3%. The method has the advantages of decreasing energy consumption of reduction process of the shaft furnace.

The invention belongs to recovery treatment on lead plaster of a waste lead-acid storage battery. The method comprises the following steps of: mixing the lead plaster of the waste lead-acid storage battery with waste sulfuric acid in the waste lead-acid storage battery according to the design requirement and roasting; adding roasting sand in a stirring kettle; adding tap water to a water level line of the device and stirring the roasting sand; adding a proper amount of calcium acetate, acetic acid and nitric acid; starting a solution circulating system pump, leaching out the roasting sand and maintaining the concentration of lead acetate to be saturated; adding a proper amount of bone glue and beta-naphthol, electrolyzing immersion liquid, recovering the metallic lead at the cathode and recovering lead dioxide at the anode; press filtering residues to obtain lead-off slag and filtrate; and adding calcium carbonate in the filtrate and recycling. The device mainly comprises a leaching part, a press filtration part, a circulating part and an electrolysis part, and concretely includes eight key components of the stirring kettle, a press filter, an overflow port, an electrolysis direct current power supply, an electrolytic cell, a cathode titanium basket, a corrosion resistant pump and a heating element.

The present invention belongs to the field of chemical technology, and especially one kind of copper base catalyst with nanometer carbon material as co-catalyst for vapor reformation of methanol to prepare hydrogen and its preparation process. The catalyst is prepared through the process including the steps of: compounding 0.1 M solution of Cu/Zn/Al nitrate; compounding 0.1 M solution of sodium carbonate, dropping the 0.1 M solution of Cu/Zn/Al nitrate and 0.1 M solution of sodium carbonate in the same rate into reactor with nanometer carbon material for co-precipitation under strong stirring and 60 deg.c to obtain carbonate coprecipitate containing nanometer carbon material; washing, drying, roasting, etc. The prepared catalyst has unique porous structure of great specific surface area, high low temperature activity and high hydrogen selectivity, and may be used in preparing reformed product with hydrogen content up to 75 % and CO content lower than 0.1 %.

The invention discloses a method for processing copper anode slime in a total wet manner, relating to a total wet production process for recycling rare and precious metals from the copper anode slime in nonferrous metallurgy. The method comprises the steps of pressurizing the copper anode slime by a chloride medium at a high temperature and leaching to directly separate out valuable metals such as copper, stibium, bismuth, tellurium, and tin; and recycling tellurium, stibium, tin, bismuth, copper and the like from a pressurized lixivium in stages. The method is further characterized in that a selective extraction method is adopted to separate gold in a gold selenium chloride solution and the selenium is recycled from a gold raffinate. According to the method, the sulfating roasting with serious pollution and huge investment is avoided, but the sulfating roasting is carried out firstly for the copper anode slime in the conventional wet method or (pyrometallurgical process); the separation recovery rate of the metals is high, but the separation effect of tellurium, stibium, tin and bismuth in the conventional process is far from ideal; by adopting the method, the leaching problems of above metals can be solved in a single process and above metals can be recycled respectively from the lixivium; the recovery rate of the metals is 90-99% respectively; the copper separation and the tellurium separation can be simplified; and the operation flow is optimized in a better manner.

The invention relates to a method for preparing ultralow-metallic-element ultrahigh-purity quartz through mixed acid hot-pressing leaching reaction. The method is characterized by comprising the following steps of crushing and classifying; performing magnetic separation; performing three-section preferential reverse flotation; performing roasting and water quenching; performing hot-pressing leaching, namely putting a product of roasting and water quenching in a reaction kettle, and performing hot-pressing acid leaching reaction in a mixed acid system while stirring, wherein the reaction temperature is 120-400 DEG C, the reaction pressure is 0.5-15.0MPa, the reaction time is 0.5-8h, and the mixed acid system for the hot-pressing leaching chemical reaction is a mixed solution of HF, HNO3 and HCl; after hot-pressing acid leaching, filtering and washing the product until the product is neutral, and drying to obtain the ultralow-metallic-element ultrahigh-purity quartz. The purification method is simple in process and easy to operate; the ultralow-metallic-element ultrahigh-purity quartz of which the SiO2 content reaches 99.995wt%, preferably 99.999wt%, can be prepared by the method.

The invention relates to a process and a device for preparing chromium iron by using chromium ore powder, which belongs to metallurgical industry steel-making raw material. The process comprises the following steps: mixing chromium iron containing raw materials with reducing agent, solvent and catalyst to prepare ultra fine powder, mixing to make pelletizing materials, sending the pelletizing materials into a reducing furnace, drying and roasting, and obtaining chromium irons after the reduction reaction. The reducing device is connected with an upper furnace above a furnace base, a lower furnace body is connected to the downside of the furnace base, the upper end of the upper furnace body is connected with an upper furnace mantle, a drying bed grate is positioned at the upper end in the upper furnace body, a purifying device is connected with the upper furnace body and the lower furnace body through pipelines, and a residual heat circulating device is connected with the lower furnace body. The invention has the advantages that: firstly, the reduction temperature is low, the reduction speed is high, the energy consumption is reduced, the production cost is lowered, the production efficiency is high, and the uniformity of the quality is ensured; secondly, the device is simple with less investment, the degree of mechanization is high, the procedure is simple, the yield is large, the mass production can be performed; thirdly, the waste of raw materials is reduced, the environment pollution is lowered; fourthly, the cost is low because the chromium ore powder and chromium-containing waste are adopted as raw materials; and fifthly, the waste resource can be recycled so as to save the resource consumption.

The invention belongs to the field of reutilization of heavy metal sludge, and particularly relates to a heavy metal sludge recycling and comprehensive utilization method. The method comprises the following steps: mixing stainless steel sludge, electroplating sludge, chromium sludge, dedusting ash generated in the chromium-nickel-iron alloy production process, and additive scales, predrying, carrying out reduction roasting, smelting to obtain a chromium-nickel-iron alloy, and using the byproduct smelting slag in preparing the cement additive. The dedusting ash and smelting slag generated in the whole technical process can be recycled, and thus, the method does not generate secondary pollution, maximally saves the resources and energy, lowers the production cost, and has obvious economic benefits.

The invention relates to a ceramic core, in particular to a water-soluble ceramic core and a preparation method thereof, which can be used in investment casting of a casting with a complex cavity structure or a hollow casting with casting temperature of not greater than 900 DEG C. The water-soluble ceramic core is obtained by specifically taking fused corundum powder, zircon sand and sodium chloride particles as main body materials and NaCl solution and polyethylene glycol as adhesives through a specific mixing process by using low-temperature drying and a high-temperature roasting process. According to the water-soluble ceramic core, not only is the strength of the core guaranteed, but also the core has good moldability; and the water-soluble ceramic core has the advantages of convenience and quickness in operation (the core is only required to be washed with clear water and can be easily removed in a short time), no pollution, no need of special equipment, no damage to the casting and the like.

A production technology of a large-specification extraordinary isotropic graphite material comprises the following steps: preparing coke powder with the average particle size of 6-20mum through utilizing airflow crushing, carrying out kneading, rolling and extrusion molding on the coke powder, rapidly charring, carrying out secondary kneading and rolling after charring, pre-molding the material subjected to the secondary kneading and rolling, and carrying out sequent processes of isopressing molding, dipping, roasting, graphitization and the like on pre-molded green body to prepare isopressed graphite; and carrying out cold molding and pressure holding stripping, and roasting and dipping many times to prepare the extraordinary isotropic graphite material. The extraordinary isotropic graphite material prepared through the method of the invention has the advantages of high mechanical strength, low porosity and excellent surface processing characteristic.

The invention provides a process of separating iron and titanium in seaside titanomagnetite via direct reduction roasting by using coal. According to the process, seaside titanomagnetite is employed as a raw material, a reducing agent, a binder, and an additive are added for briquetting, and then a selective direct reduction roasting - magnetic separation method is employed for respectively recovering iron and titanium. The process of the invention is simpler compared with other methods, wherein cost-effective coal is directly used as the reducing agent, additives added in the process is a mixture of sodium carbonate and sodium borate, and by adding the reducing agent and the additive, and controlling roasting temperature and time, selective reduction of iron and separation of iron and titanium can be achieved, ensuring the grade and recovery rate of direct reduced iron while reducing the titanium content in the direct reduced iron. The finally obtained direct reduction iron powder has a grade above 93%, the recovery rate of iron is generally greater than 85%, the titanium dioxide content is less than 0.5%, while the titanium dioxide content in obtained high titanium magnetic separation tailings is higher than 20%, and the recovery rate of titanium is greater than 90%.

The invention discloses a nuclear graphite material preparation method including the following steps: (1) mixing and kneading; (2) grinding; (3) isostatic compaction; (4) roasting, to be more specific, baking treatment of the product obtained by the step (3) in an atmosphere furnace introduced with halogen or halogenated hydrocarbon at the treatment temperature of 800 to 1100 DEG C; (5) dipping; and (6) roasting; according to the method, in the roasting process, a halogen or halogenated hydrocarbon purified gas is introduced, a purification procedure is inserted in without reduction of the common preparation step, the cost of purification can be greatly reduced, in the roasting process, asphalt volatile components may cause many holes in graphite blocks, the holes greatly facilitate the purified gas to enter into the graphite blocks for purification so as to facilitate further purification of nuclear graphite blocks and great reduction of impurities and boron equivalent; the nuclear graphite material preparation method has the advantages of simple process, convenient operation, less production equipment, can further reduce the cost, and is convenient in popularization and application, and suitable for mass production.

The invention relates to a manufacturing method of sludge shale bricks; wherein, the sludge is precipitated and dehydrated and is aged and fermented with shale powders and raw coal powder; after the treatment of uniformization and stirring, vacuum is used for extrusion molding and cutting; architecture bricks are obtained by drying and the high temperature roasting of green bricks; the temperature left from the high temperature roasting can be taken as drying heat source for the green bricks, which saves the energy resources; by adopting reasonable ratio and optimized production process, the manufacturing method consumes a great deal of abandoned sludge, manufactures bricks with good quality and has low production cost; furthermore, the whole production process realizes the automatic production, which greatly reduces the labor intensity, improves the working environment of operators and improves the production efficiency; the manufacturing method is a brick manufacturing method which is good for the nation and people and is economic and environment friendly.