Method for reducing voltage drop of aluminum cell stop

Oxygen-enriched combustion-supporting method of pulverized coal fired boilers

The invention provides an oxygen-enriched combustion-supporting method of pulverized coal fired boilers, and relates to an oxygen-enriched combustion method of coal-fired boilers. The oxygen-enriched combustion-supporting method is characterized in that: the oxygen-enriched combustion process of a coal-fired boiler firstly adopts an enriched oxygen generator to oxygenize air and prepare oxygenized gas after filtering and purifying the air; and then the prepared oxygenized gas enters a hearth for oxygen enriched combustion after drying and preheating. The oxygen-enriched combustion-supporting method has the advantages that: (1) oxygenized air is dry gas; (2) no soft water consumption is generated; (3) a gas-water separator, a dehumidifier, a draining pump, a water ring vacuum pump water-inlet pressure-stabilizing tank, a water level control device, and the like are omitted, so the device is simplified; and (4) floor occupation is reduced. After improvement, the moisture can be reduced by ...

Technique for producing aluminum oxide by alkali dissolving carbonation method

A novel technique process which combines an alkali dissolution process, a carbon dioxide decomposition process and an electrolytic regeneration cycling process is employed in a producing process of alumina. The steps comprise employing sodium hydroxide solution to dissolve alumina in alumyte in form of sodium aluminate, adding sodium bicarbonate solution or carbon dioxide to completely decompose sodium aluminate, then transforming into aluminum hydroxide to separate out to obtain alumina products after roasting, employing electrolytic method to electrolyze sodium carbonate mother liquor and respectively obtaining NaOH solution and NaHCO3 solution in cathode region and anode region. And regenerating and recycling NaOH solution and NaHCO3 solution is realized.

不停产修复铝电解槽侧壁的方法

A technology for repairing the side wall of aluminium electrolyzer without stopping production includes cutting open the internal edge plate at the position where the side wall is damaged, opening the alumina shell, filling and compacting the isolating dam between said damaged side wall and anode, removing the residual substance from said side wall, mounting new side wall, welding the internal edge plate, blocking by cryolite and alumina powder, and natural calcining. Its advantages are high speed and low cost.

Method and equipment for filtering smoke of asphalt

The method for filtering asphalt smoke is characterized by that it uses large-granule calcined coke as adsorbing agent, and makes the asphalt smoke pass through the adsorption bed formed from large-granule calcined coke to make filtration. Said invented equipment for filtering asphalt smoke is a fixed bed adsorber formed from shell, smove inlet, smoke outlet and calcined coke layer, and its efficiency is up to above 94%.

Technical method and electrobath for reducing electricity consumption during alumina production by using method of alkali-dissolution and carbonization-precipitation

The invention relates to a technical method and an electrobath for reducing electricity consumption during alumina production by using the method of alkali-dissolution and carbonization-precipitation.The method is an energy-saving technical method based on electrolysis of sodium carbonate by means of oxygen cycle, respectively prepares sodium hydroxide and sodium bicarbonate in a cathode chamberand an anode chamber, and can obviously reduce the electricity consumption during the alumina production by using the method of alkali-dissolution and carbonization-precipitation. The energy-saving electrobath comprises an oxygen cathode, an oxygen chamber or an oxygenized air chamber, a cathode chamber, a cation-exchange membrane, an anode chamber and an anode, and is characterized in that the oxygen chamber or the oxygenized air chamber is specially arranged; the cathode adopts a gas electrode with an activity of catalyzing oxygen reduction; the cathode reaction is a reduction reaction for absorbing ...

Environmental protection based red mud combination modification synergism fire-retardant polyethylene

The invention relates to an environmental protection based red mud combination modification synergism fire-retardant polyethylene, and belongs to the technical field of compressive utilization and fire-retardant plastics. The fire-retardant polyethylene is suitable for fire safety protection in important public places in the fields of electric products, building materials and transportation. The fire-retardant polyethylene consists of the following components in percentage by weight: 30 to 35 percent of polyethylene, 34 to 39 percent of red mud, 6 to 13 percent of red phosphorus, 5 to 17 percent of zinc borate, 3 to 8 percent of ethylene-vinyl acetate copolymer, 2 to 7 percent of grafted polyethylene, and 2 to 8 percent of silicone oil. The preparation process comprises the following steps of: grinding and drying the red mud; blending the ground red mud with other raw materials according to the blending ratio; mixing the mixture with polyethylene resin by fully stirring at a high speed; ...

Method for producing alumina by using sodium bicarbonate to decompose sodium aluminate solution

The invention discloses a method for producing alumina by using sodium bicarbonate to decompose sodium aluminate solution. The method uses sodium bicarbonate or mixed solution of sodium bicarbonate and sodium carbonate as neutralizing agent to decompose and separate out aluminum hydroxide from alumina dissolving solution, namely sodium aluminate solution. The decomposition is carried out by two steps: a first step, controlling the ratio of the total equivalents of the added sodium bicarbonate to caustic alkali of the alumina dissolving solution to be not more than 0.9 so as to ensure that the obtained aluminum hydroxide and a roasted alumina product have high quality; and a second step, controlling the ratio of the total equivalents of the added sodium bicarbonate to the residual caustic alkali to be not less than 1.0 so as to ensure that the residual sodium aluminate is totally separated out in a form of mixed sediment of aluminum hydroxide and dawsonite and the product can be used as ...

Detection method for carbon block density during the forming process of aluminium electrolyse electrode

Method for dissolving out alumina in bauxite by using sodium hydroxide

The invention discloses a method for dissolving out bauxite to produce alumina by using sodium hydroxide solution as dissolving agent. Compared with a Bayer's method using seed separation mother liquor as dissolving agent, the method of the invention can greatly improve the dissolving capacity of unit alkali liquor, and can be used for the dissolution of the alumina in the low-grade bauxite after pre-desilication treatment. The method reduces futile cycle of materials, and remarkably improves the production efficiency of equipment. The sodium hydroxide solution used by the method can be recycled by using film electrolytic sodium aluminate to decompose mother liquor, namely sodium carbonate solution.

Method for removing iron from solution of aluminum chloride

The invention relates to a method for removing iron from solution of aluminum chloride. The method comprises the following steps of: introducing iron-containing solution of aluminum chloride into a resin column; and removing iron by using the iron-adsorbing capacity of the resin to obtain refined solution of aluminum chloride, wherein the pH value of the solution of aluminum chloride is 1.0 to 3.0, the processing temperature is between the room temperature and 90 DEG C, and the flow velocity of the solution of aluminum chloride is 1 to 4-time resin volume per hour. The method has the characteristics of simple process, easily controlled production process and stable product quality; and by adopting the method, the source of raw materials of the solution of aluminum chloride and the following products is widened, and the production cost is lowered.

Technical method and electrobath for reducing electricity consumption during alumina production by using method of alkali-dissolution and carbonization-precipitation

The invention relates to a technical method and an electrobath for reducing electricity consumption during alumina production by using the method of alkali-dissolution and carbonization-precipitation. The method is an energy-saving technical method based on electrolysis of sodium carbonate by means of oxygen cycle, respectively prepares sodium hydroxide and sodium bicarbonate in a cathode chamber and an anode chamber, and can obviously reduce the electricity consumption during the alumina production by using the method of alkali-dissolution and carbonization-precipitation. The energy-saving electrobath comprises an oxygen cathode, an oxygen chamber or an oxygenized air chamber, a cathode chamber, a cation-exchange membrane, an anode chamber and an anode, and is characterized in that the oxygen chamber or the oxygenized air chamber is specially arranged; the cathode adopts a gas electrode with an activity of catalyzing oxygen reduction; the cathode reaction is a reduction reaction for absorbing ...

Method for collecting asphalt smog in vibration formation process of prebaked anode

The method for collecting usphalt smog in the course of vibration forming process of precalcined anode is characterized by that a jet gas flow with plane distribution is blown into the upper portion of vibration forming die bucket for precalcined anode, and a gas curtain is formed over the die bucket, a gas cuaking cover is placed on another side to suck and collect the gas flow. Said jet gas flow can be jetted out from a flat jet nozzle whose width is identical to that of forming die bucket, its gas flow speed is 5-10 m/s, and the jet gas flow is 0-10 deg. below horizontal level, its one side is used for sucking gas and another side is used for blowing gas so as to form gas curtain so as to remove harmful substances.

Environmental protection based red mud combination modification synergism fire-retardant polyethylene

The invention relates to an environmental protection based red mud combination modification synergism fire-retardant polyethylene, and belongs to the technical field of compressive utilization and fire-retardant plastics. The fire-retardant polyethylene is suitable for fire safety protection in important public places in the fields of electric products, building materials and transportation. The fire-retardant polyethylene consists of the following components in percentage by weight: 30 to 35 percent of polyethylene, 34 to 39 percent of red mud, 6 to 13 percent of red phosphorus, 5 to 17 percent of zinc borate, 3 to 8 percent of ethylene-vinyl acetate copolymer, 2 to 7 percent of grafted polyethylene, and 2 to 8 percent of silicone oil. The preparation process comprises the following steps of: grinding and drying the red mud; blending the ground red mud with other raw materials according to the blending ratio; mixing the mixture with polyethylene resin by fully stirring at a high speed; ...

Dissipated metal indium chloride/chloridization 1-methyl-3-butyl imidazole system plating solution

Dissipated metal indium chloride/chlorination 1- methyl-3-butyl-imidazole system plating liquid (g.kg<-1>) is formed by the following materials: 80 to 100 portions of the metal indium (In), 230 to 430portions of anhydrous InCl3, 180 to 360 portions of the chlorination 1- methyl-3-butyl-imidazole (MBIC), 200 to 300 portions of glycol, 1 to 3 portions of isinglass, 20 to 40 portions of dextrine aswell as 30 to 50 portions of sodium chloride(NaCl). Ion liquid is a novel green solvent and the indium-plated liquid researched by utilizing the room temperature ion liquid of the dissipated metal hasa plurality of specific properties like lower melting point, adjustable Lewis acidity, excellent conductive property, negligible steam pressure, wider using temperature, special solubility, etc. theindium-plated liquor does not have the problems of hydrating, hydrolyzing and hydrogen evolution and has the properties of no corrosion and low pollution that should be prepared by a green solvent. The fine ...

Preparation for alpha-type nanometer aluminium oxide powder by combustion synthetic method

A process for preparing nano-class alpha-Al2O3 powder by combustion synthesis method includes such steps as preparing aqueous solution of aluminium nitrate and aqueous solution of urea, proportionally adding them to reactor in heater, and reacting at 200-1200 deg.C for 5-100 min. Its advantages are high productivity and reaction speed, low energy consumption, high product performance and no environmental pollution.

Aluminum electrolytic tank calcining method

An aluminum electrolytic tank baking method relates to the technology method for electrolytic preparation of the metal aluminum with alumina as raw material, especially a novel electrolytic tank current-carrying baking method in the process of electrolytic preparation. The preparing process comprises: pouring the molten liquid aluminium into the novel electrolytic tank, covering the liquid aluminum with the cryolite, and current-carrying baking until the voltage is down to 1.5í½2.0V from 3V naturally, characterized by : when the tank voltage is less than 2.0V, employing the gradually lifting anode method for improving the voltage, keeping the voltage of 2.0í½2.1V, improving the voltage to 3V again at the 24 hours before starting, and finishing the electrolytic tank baking when the temperature reaches 850í½900íµ.

Detection method for carbon block density during the forming process of aluminium electrolyse electrode

The invention relates to a kind of method to check the density of the carbon on line when making vibrating to shape it during production. The character of the invention is use move sensor that is on the fixed orienting flat to send move message of heavy hammer to PC controlling system, and measure the density through the counting process set by the PC. The invention can judge the carbon quality directly on line. It is simple to install the device which has high precision and simple stead structure.

Self-control device for blowing balloon

The invention relates to a self-control device for blowing balloon. The device is characterized by comprising a tube. When in use, a balloon mouth is sleeved on the tube; and the mouth of a person is contacted with the tube but not the balloon, so that mouths of people are contacted with the tube instead of a balloon, thereby avoiding the occurrence of insanitation conditions such as bacterium spreading and the like due to that multiple people contact with one balloon at the same time. The device is simple in manufacturing, and can blow the balloon in a clear and relax mode.

预焙阳极的振动成型过程沥青烟的收集方法

... 预焙阳极的振动成型过程中沥青烟的收集方法，其特征在于在预焙阳极的振动成型模具斗上方吹入呈平面分布的喷射气流，在模具斗上方形成气幕，在另一侧设置一吸气罩，气流经吸气罩吸收而收集。其喷射气流由一与成型模具斗宽度相当的扁平喷气嘴喷出，气流速度为5-10m/s，喷出低于水平0-10°；本发明的方法在一侧吸气的同时在另一侧吹气，形成气幕，并利用射流作为动力，把有害物送至排风口再由其排除，在相同的控制效果时，排风量比单纯吸气罩的少，能耗低。 ...

一种滤清沥青烟气介质的再生方法

A process for regenerating the medium used to filter the fume of asphalt features that the hot airflow at 300-600 deg.C under 0.5-3 MPa is reversely blown into the filtering apparatus of asphalt fume to increase the flowability of volatile condensed substance adsorbed on said medium and impact said condensed substance to separate it from said medium. Its regeneration rate reaches more than 95%.

Method for producing alumina by using sodium bicarbonate to decompose sodium aluminate solution

The invention discloses a method for producing alumina by using sodium bicarbonate to decompose sodium aluminate solution. The method uses sodium bicarbonate or mixed solution of sodium bicarbonate and sodium carbonate as neutralizing agent to decompose and separate out aluminum hydroxide from alumina dissolving solution, namely sodium aluminate solution. The decomposition is carried out by two steps: a first step, controlling the ratio of the total equivalents of the added sodium bicarbonate to caustic alkali of the alumina dissolving solution to be not more than 0.9 so as to ensure that the obtained aluminum hydroxide and a roasted alumina product have high quality; and a second step, controlling the ratio of the total equivalents of the added sodium bicarbonate to the residual caustic alkali to be not less than 1.0 so as to ensure that the residual sodium aluminate is totally separated out in a form of mixed sediment of aluminum hydroxide and dawsonite and the product can be used as ...

Dissipated metal indium chloride/chloridization 1-methyl-3-butyl imidazole system plating solution

Dissipated metal indium chloride/chlorination 1- methyl-3-butyl-imidazole system plating liquid (g.kg<-1>) is formed by the following materials: 80 to 100 portions of the metal indium (In), 230 to 430 portions of anhydrous InCl3, 180 to 360 portions of the chlorination 1- methyl-3-butyl-imidazole (MBIC), 200 to 300 portions of glycol, 1 to 3 portions of isinglass, 20 to 40 portions of dextrine as well as 30 to 50 portions of sodium chloride(NaCl). Ion liquid is a novel green solvent and the indium-plated liquid researched by utilizing the room temperature ion liquid of the dissipated metal has a plurality of specific properties like lower melting point, adjustable Lewis acidity, excellent conductive property, negligible steam pressure, wider using temperature, special solubility, etc. the indium-plated liquor does not have the problems of hydrating, hydrolyzing and hydrogen evolution and has the properties of no corrosion and low pollution that should be prepared by a green solvent. The ...

Technique for producing aluminum oxide by alkali dissolving carbonation method

A novel technique process which combines an alkali dissolution process, a carbon dioxide decomposition process and an electrolytic regeneration cycling process is employed in a producing process of alumina. The steps comprise employing sodium hydroxide solution to dissolve alumina in alumyte in form of sodium aluminate, adding sodium bicarbonate solution or carbon dioxide to completely decompose sodium aluminate, then transforming into aluminum hydroxide to separate out to obtain alumina products after roasting, employing electrolytic method to electrolyze sodium carbonate mother liquor and respectively obtaining NaOH solution and NaHCO3 solution in cathode region and anode region. And regenerating and recycling NaOH solution and NaHCO3 solution is realized.

Manufacturing method of wall surface polishing antifouling wax

An anti-fouling polishing wax for wall surface treated by coating or emulsion paint is disclosed. Its advantages are high effect and safety, no poison and soft lustre.

Solvent suction process for separation of hydrocarbon mixture

Method for dissolving out alumina in bauxite by using sodium hydroxide

The invention discloses a method for dissolving out bauxite to produce alumina by using sodium hydroxide solution as dissolving agent. Compared with a Bayer's method using seed separation mother liquor as dissolving agent, the method of the invention can greatly improve the dissolving capacity of unit alkali liquor, and can be used for the dissolution of the alumina in the low-grade bauxite afterpre-desilication treatment. The method reduces futile cycle of materials, and remarkably improves the production efficiency of equipment. The sodium hydroxide solution used by the method can be recycled by using film electrolytic sodium aluminate to decompose mother liquor, namely sodium carbonate solution.