36results about How to "Reduce roasting energy consumption" patented technology

The invention discloses a system for oxidizing roasting-reducing roasting of titaniferous iron concentrate and a roasting process. A fluidized bed oxidation reactor is adopted for the oxidizing roasting of the titaniferous iron concentrate; the oxidized titaniferous iron concentrate enters a fluidized bed reduction reactor for reducing roasting; the reduced titaniferous iron concentrate is sequentially and spirally cooled by a cyclone cooler and water cooling and then enters a downstream section; and reduced coal gas is firstly subjected to heat exchange by the cyclone cooler, then preheated by a coal gas preheater, and enters a reducing furnace, latent heat of unreacted reducing gas in tail gas exhausted from the fluidized bed reduction reactor is firstly released through combustion in a combustion chamber, and hot flue gas generated by the combustion is mixed with the tail gas exhausted by the fluidized bed oxidation reactor and then enters a multi-stage cyclone preheater to exchange heat with the titaniferous iron concentrate for heat recovery. The system disclosed by the invention has the advantages of high reaction efficiency, full heat utilization, good economical efficiency in the roasting process and the like, and is suitable for large-scale continuous industrial production.

The invention discloses a method for producing alumina by curing fly ash with sulphuric acid, belonging to the technical field of comprehensive utilization of the fly ash. The method comprises the following steps: uniformly mixing a proper amount of concentrated sulfuric acid and the fly ash, then carrying out curing so as to obtain a sulfated clinker, then leaching the clinker with an aluminum sulfate crystallized mother liquor or water so as to obtain an aluminum sulfate and high-silicon slag, subjecting the aluminum sulfate solution to evaporation, concentration, crystallization, drying and dehydration so as to obtain aluminum sulfate, subjecting obtained aluminum sulfate and a proper amount of a reducing agent to rapid reduction and calcination so as to obtain crude alumina, then treating the crude alumina by adopting a low-temperature Bayer process so as to produce metallurgical-grade alumina, wherein the obtained high-silicon slag can be leached by sodium hydroxide to produce white carbon black or active calcium silicate. The method provided by the invention has the advantages of high aluminum recovery rate, easily-available equipment and materials, good alumina product quality, etc.; and the slag obtained by leaching of aluminum is the high-silicon slag with good alkali-soluble activity, and can be used for further production of a variety of high-value-added silicon products.

The invention belongs to the technical field of gangue sintered brick production, in particular to an energy-saving tunnel kiln used for gangue sintered brick production. The energy-saving tunnel kiln comprises a drying kiln and a calcining kiln, wherein the calcining kiln comprises a kiln body extending along the horizontal direction, and a light kiln car, the kiln body comprises a kiln top, a kiln wall and a working passage, the working passage comprises a preheating section, a calcining section, a holding section and a cooling section in sequence along the extending direction, the cooling section at a kiln tail is provided with a cooling system, an under-kiln balance cooling system and a bootstrap system, a kiln temperature and kiln pressure monitoring and controlling system is also arranged on the kiln body, and the kiln temperature and kiln pressure monitoring and controlling system is provided with a computer automatic control system in a connected way. The energy-saving tunnel kiln has the beneficial effects that above-thermal calcining and fast calcining are realized, the calcining period is shortened, the calcining energy consumption is reduced, and the heat utilization rate is improved, so that the goal of energy saving is achieved.

The invention relates to a method for producing polishing powder used for a liquid crystal display device. The method comprises the following steps: at the room temperature, 30 to 40 percent of fluorosilicic acid is added into rare earth chloride solution with REO of between 80 and 100 gram/litre and CeO2/REO of more than or equal to 70 percent under the stirring; after five minutes, an additive A is added into the mixture, is heated to the temperature of between 70 and 80 DEG C, is kept at the temperature and is added with mixed precipitant solution till the reaction ends; the PH value of the mixture is 7; the mixture is stirred for 10 minutes, is kept stand for 3 to 5 hours and supernatant fluid of the mixture is removed through siphonage; under the stirring, cold water is added to nearly fill a groove fully; before the stirring is stopped, flocculant solution is added till appearing the flocculating effect; the mixture is kept stand, is deposited and the supernatant fluid of the mixture is removed through siphonage for three times; the mixture is washed, is heated up to 98 DEG C, is kept at the temperature for 10 minutes and is discharged to a stainless steel sieve with 120 meshes; the mixture is subjected to solid-liquid separation, vacuum extraction and filtering and dewatering by a centrifuge; a filter cake is transferred to a quartz material sagger; the charging thickness is less than or equal to 9 centimeters; the filter cake is transported to a muffle tunnel kiln at the temperature of 900 DEG C, is subjected to dehydration in a preheating section and decomposition and transformation at certain degree, is roasted for 3 to 4 hours at high temperature of 900 DEG C, is cooled to the temperature of less than 400 DEG C in a cooling section and comes out from the kiln; a roasted material is cooled to the room temperature and is subjected to stage treatment; and a quality part is the product.

The invention relates to a method for recycling gold for gold-bearing washing mud of a gold ore cyaniding system. The method includes the following wet process-pyrogenic process combined technologicalsteps of crushing and grinding, acid leaching, solid-liquid separation, roasting, size mixing, alkali adjusting, gold extraction with a carbon-in-leach process and screening for solid-liquid separation b; and according to conditions, conventional sulfuric acid is replaced with hydrochloric acid for acid leaching, the weight of samples entering the roasting step can be reduced, the roasting energyconsumption is reduced, the problem of secondary gold wrapping caused by generation of calcium sulfate can be solved, the gold leaching efficiency is improved, the beneficial effects of being simplein process, low in production cost, high in gold leaching efficiency, capable turning waste into wealth, environment-friendly and the like are achieved, efficient recycling of gold-bearing washing mudvaluable resources can be achieved, and the method is suitable for recycling and application of the gold in the washing mud of the gold ore cyaniding system.

The present invention discloses a ring-type baking furnace for carbon production. According to the ring-type baking furnace, a plurality of furnace chambers are subjected to head-tail connection combination to form a ring; a material box (4) and a fire channel (5) are separately arranged; the upper portion of the preheat furnace chamber material box (4) is provided with a furnace cover (1); a volatilization component pipeline (3) is arranged between the two rows of the furnace chambers; the upper portion of a heat furnace chamber is provided with volatilization component combustion frames (2); the furnace cover (1) and the volatilization component combustion frames (2) are connected with the volatilization component pipeline (3); the volatilization component combustion frame (2) is connected with the fire channel (5) of the heat furnace chamber; the furnace cover (1) is provided with asphalt volatilization component discharge ports; and furnace cover volatilization component discharge ports and inlets of the volatilization component combustion frames (2) are connected through the volatilization component pipeline (3). With the present invention, the condition that harmful asphalt volatilization components enter baking flue gas so as to cause pollution can be avoided, baking energy consumption can be reduced, benzopyrene can be effectively treated, a clean production purpose can be achieved, and the condition that the too high temperature at the preheat stage causes the baking product to generate cracks can further be avoided.

The invention discloses a carbonate/silicon oxide compound gel adsorbent and a preparation method thereof, which belong to the technical field of preparation of chemical adsorbents. The method comprises the following steps of: adding carbonate at a condensation polymerization reaction phase according to the process characteristic of a porous adsorbent prepared with a sol-gel method for accelerating a reaction and introducing active ingredients specific to a target pollutant, i.e., SO2; and under the action of an acid catalyst, performing a hydrolysis reaction on a silicon source precursor to generate silicon oxide sol, adding a carbonate solution into the sol, stirring for gelling, aging, and drying under the normal pressure to obtain carbonate/SiO2 compound dry gel which can be taken as a chemical adsorbent for removing harmful gases such as SO2 and H2S. The preparation method has the advantages of wide source, low cost, simple process, easiness for operating, no need of baking at a high temperature and low energy consumption; and the prepared compound gel adsorbent has the advantages of high specific surface area, uniform dispersion of active ingredients and high removing efficiency on harmful gases.

The invention discloses a continuous pre-baked anode carbon block with a split type independent carbon bowl and ultra-long filling block structure. The continuous pre-baked anode carbon block comprises a carbon block body, wherein carbon bowl assembly connecting pits are formed in the carbon block body, carbon bowl assemblies are arranged in the carbon bowl assembly connecting pits, carbon bowls are arranged on the carbon bowl assemblies, mechanical steel claw connecting ring grooves are formed in the positions, at the bottoms of the carbon bowls, of the charcoal bowl assemblies, and ultra-long carbon bowl filling blocks are movably arranged in the parts, on the carbon bowl assemblies, of the carbon bowls. The continuous pre-baked anode carbon block cooperates with casting-mechanical steelclaws so that the continuous use of a pre-baked anode can be realized, the time for connecting a new anode carbon block is short, the labor intensity is low, the use is convenient, the filling rate of the continuous pre-baked anode carbon block is improved, the connection strength of the carbon block is improved, the whole resistance of the anode carbon block is reduced, the service life of the single carbon block is prolonged, the production cost is low, moreover, manufacturing, roasting, transportation and use of the carbon block body, the split type independent carbon bowls, and the ultra-long filling blocks are all simple, and the characteristics of being high in manufacturing finished product rate, low in expense is low, low in cost and the like are achieved.

The invention discloses a method for reducing baking energy consumption of prebaked carbon anodes for aluminum electrolysis, and relates to an improved method for baking prebaked carbon anodes for aluminum electrolysis. The method is characterized in that in the baking process, the smoke exhaust frame total negative pressure is controlled to be 1,600-2,600 Pa; baking curve is controlled to be 26-48 h (250-620 DEG C, 7.5-14 DEG C,/h; 800-1,000 DEG C, 4-8 DEG C/h; 1,000-1,180 DEG C, 3.5-7 DEG C/h); temperature difference between different fire passages at 300-800 DEG C is controlled to be (-30)-30 DEG C; temperature difference between different fire passages at 1,000-1,180 DEG C is controlled to be (-5)-5 DEG C; and upper-lower temperature difference for the same fire passage is controlled to be 0-150 DEG C. The inventive method reasonably establishes baking curve, and reasonably controls exhaust frame total negative pressure to lower practical energy consumption; and effectively controls temperature difference of high-temperature zones and low-temperature zones between different fire passages, and upper-lower temperature difference for the same fire passage, so as to improve qualification rate of prebaked blocks, effectively lower baking energy consumption and reduce carbon anode cost.

The invention provides a semi-internal combustion type red mud sintered brick and a production process and application thereof, and relates to the technical field of building materials, the semi-internal combustion type red mud sintered brick comprises the following components in parts by mass: 20-60 parts of Bayer process red mud, 5-15 parts of plastic clay, 15-20 parts of coal gangue, 10-40 parts of aggregate, 5-10 parts of a fluxing agent, 3-10 parts of a binder and 1-5 parts of a radioactivity shielding agent, wherein the sum of the parts by weight of the components is 100. According to the semi-internal combustion type red mud sintered brick provided by the invention, the doping amount of Bayer process red mud is greatly increased, through the synergistic cooperation of the components, the compressive strength reaches the MU30 standard, the problems of heavy metal dissolution pollution risk, scumming and the like are avoided in the use process, the radioactivity level is also greatly reduced, the national building main body material standard can be met, meanwhile, coal gangue is added into the raw materials, internal combustion and external combustion can be achieved in the production process, roasting energy consumption is remarkably reduced, and the production cost is effectively reduced.

The invention discloses a rotary kiln roasting structure and a roasting process thereof. The rotary kiln roasting structure comprises a bottom plate, wherein a rotary kiln body which is obliquely arranged is arranged above the bottom plate; a first motor is arranged at one side below the rotary kiln body; the output end of the first motor is fixedly connected with a drive gear; the middle part ofthe rotary kiln body is fixedly connected with a driven gear; one end of the rotary kiln body is connected with a coal injection mechanism; the coal injection mechanism comprises a combustor; one endof the rotary kiln body is rotatably connected with the middle part of the combustor; one end, far away from the rotary kiln body, of the combustor is fixedly connected with a connecting tube; the drive gear is engaged with the driven gear, the driven gear rotates, and the rotary kiln body fixedly connected with the driven gear rotates; the rotary kiln body is obliquely arranged, and the rotary kiln body rotates, so that materials move from the head end of the rotary kiln body to one end of the combustor while rotating; the closer the materials are to the combustor, the higher the temperatureis; and the materials are gradually roasted by flame sprayed out from a burner uniformly, so that the roasting effect is better, and roasting energy consumption is reduced.

The invention discloses a coal tar bimodal pore structure hydrogenation pretreatment catalyst and a preparation method thereof. The pore volume of a coal tar bimodal pore structure hydrogenation pretreatment catalyst aluminum oxide carrier is 0.8-1.5 mL/g, the specific surface area is 120-350m < 2 >/g, the most probable pore size of mesopores is 15-30nm, the most probable pore size of macropores is 2000-4000nm, and the pore volume of macropores with the pore size of 2400nm or above accounts for 5-25% of the total pore volume. Aluminum oxide is used as a carrier, VIB and VIII metal elements areused as active components, a phosphorus element is used as an auxiliary agent, the weight content of the active components in the hydrogenation pretreatment catalyst is 0.4%-10% by metal, and the weight content of the auxiliary agent phosphorus in the hydrogenation pretreatment catalyst is 0.1%-10% by element. The coal tar bimodal pore structure hydrogenation pretreatment catalyst provided by theinvention has the advantages of large pore volume, large pore diameter, excellent diffusivity, and high demetallization and hydrogenolysis asphaltene activity.

The invention relates to a forming process in production of a carbon material, and particularly relates to a forming process for a cathode carbon block with a bottom groove for an aluminum electrolytic cell. The forming process is characterized by comprising the steps of: vibrating and pre-slotting the cathode carbon block to shape and generate a block; roasting; and finally, machining a grooved milling face. The forming process provided by the invention is special; the cost is reduced; and the carbon block yield is improved.