CN112939050B - Resource utilization process suitable for semi-dry desulfurization waste ash in electrolytic aluminum industry - Google Patents
Resource utilization process suitable for semi-dry desulfurization waste ash in electrolytic aluminum industry Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/46—Sulfates
- C01F11/464—Sulfates of Ca from gases containing sulfur oxides
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B11/00—Calcium sulfate cements
- C04B11/26—Calcium sulfate cements strating from chemical gypsum; starting from phosphogypsum or from waste, e.g. purification products of smoke
- C04B11/262—Calcium sulfate cements strating from chemical gypsum; starting from phosphogypsum or from waste, e.g. purification products of smoke waste gypsum other than phosphogypsum
- C04B11/264—Gypsum from the desulfurisation of flue gases
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- Y02P10/20—Recycling
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Abstract
The invention discloses a recycling process suitable for semi-dry desulfurization waste ash in the electrolytic aluminum industry; the method comprises the following steps: s1, adding an aqueous solution into semi-dry desulfurization waste ash to enable sulfur trioxide to be dissolved; s2, extracting iron and aluminum in the dry desulfurization waste ash under a high-temperature low-oxygen environment; s3, slowly heating the reaction impurities in the S2 through an oxidation kiln to sublimate residual sulfur trioxide in the impurities; s4, conveying the substances after the reaction in the S3 into a cooling roller for cooling; s5, extruding the cooled substance into blocks, so that the cooled substance is convenient to convey; the invention has simple materials, and through three-stage circulation heating and cooling, the temperature is reduced in turn, the resources are saved, the sulfur trioxide and the calcium oxide are converted into calcium sulfide compounds, the reutilization can be realized, and the metal materials in the semi-dry desulfurization waste ash are effectively extracted through a high-temperature low-oxygen environment.
Description
Technical Field
The invention belongs to the technical field of electrolytic aluminum industry, and particularly relates to a recycling process suitable for semi-dry desulfurization waste ash in the electrolytic aluminum industry.
Background
Electrolytic aluminum is aluminum obtained by electrolysis. The modern electrolytic aluminum industrial production adopts cryolite-alumina fused salt electrolysis method. Molten cryolite is solvent, alumina is used as solute, carbon body is used as anode, molten aluminum is used as cathode, strong direct current is introduced, electrochemical reaction is carried out on two poles in an electrolytic tank at 950-970 ℃, namely electrolysis is carried out, and industrial aluminum is produced by adopting an electrolytic method. The biggest obstacle of the prior application prospect of the semi-dry desulfurization process is the treatment of the desulfurization waste ash which is a byproduct of the desulfurization system, especially in some remote areas, no cement plant and other production enterprises capable of digesting the desulfurization waste ash exist around, the desulfurization waste ash is piled up everywhere, a large amount of dust-raising waste ash can appear in windy weather, the surrounding environment of the plant area is greatly influenced, and in the semi-dry desulfurization process, the semi-dry desulfurization ash is a byproduct generated by the semi-dry flue gas desulfurization process, and the main components of the semi-dry desulfurization process are as follows: free calcium oxide, calcium sulfite, calcium carbonate, calcium sulfate, calcium hydroxide, etc. The semi-dry desulfurization ash is unstable in composition, weak in alkalinity and easy to decompose, so that comprehensive utilization of the semi-dry desulfurization ash is very difficult, but various problems still exist in recycling utilization of the semi-dry desulfurization waste ash on the market.
The method for reutilizing the lime semi-dry desulfurization ash disclosed in the authority publication No. CN109865421A, although realizing the reduction of consumption of lime/limestone resources and the production of byproducts of flue gas desulfurization, reducing the flue gas desulfurization cost, avoiding secondary pollution caused by landfill, and being beneficial to improving the recycling level of desulfurization products, has very obvious economic benefit and social benefit, but does not solve the problems that a large amount of sulfur-containing substances remain in the existing waste ash, the sulfur-containing substances are unstable and easily cause secondary pollution, metals in waste liquid cannot be effectively extracted, and resources are wasted, and the like, therefore, the method is suitable for the recycling process of the semi-dry desulfurization waste ash in the electrolytic aluminum industry.
Disclosure of Invention
The invention aims to provide a recycling process suitable for semi-dry desulfurization waste ash in the electrolytic aluminum industry, so as to solve the problems in the background technology.
In order to solve the technical problems, the invention provides a recycling process suitable for semi-dry desulfurization waste ash in the electrolytic aluminum industry, which comprises the following steps:
s1, adding an aqueous solution into semi-dry desulfurization waste ash to enable sulfur trioxide to be dissolved: adding an aqueous solution into the semi-dry desulfurization waste ash, so that sulfur trioxide and water are generated into sulfuric acid, and reacting the sulfuric acid with calcium oxide in the semi-dry desulfurization waste ash at normal temperature to generate calcium sulfate solid;
s2, extracting iron and aluminum in the dry desulfurization waste ash under a high-temperature low-oxygen environment: filtering, compressing and drying the solid-liquid solution in the step S1, adding coking coal into the semi-dry desulfurization waste ash, grinding and crushing the semi-dry desulfurization waste ash and the coking coal, grinding the semi-dry desulfurization waste ash and the coking coal into particles with the diameter of 0.3-0.6mm by a grinding device, spreading the semi-dry desulfurization waste ash and the coking coal powder in a high-temperature reaction furnace, and enabling the high-temperature reaction furnace to react in a low-oxygen high-temperature environment;
s3, slowly heating the reaction impurities in the S2 through an oxidation kiln to sublimate residual sulfur trioxide in the impurities: inputting reaction impurities into an oxidation kiln, heating the oxidation kiln through an external heating furnace and a burner, sublimating sulfur trioxide in the reaction impurities into gas at high temperature, discharging and absorbing the gas, and adsorbing the sulfur trioxide through an adsorption method;
s4, conveying the substances reacted in the step S3 into a cooling roller for cooling: the reaction substances in the step S3 are conveyed into the cooling roller through a conveying auger to be cooled in a rolling way, and cold air and oxygen are conveyed into the cooling roller at one end of the cooling roller to realize cooling and reaction prevention of the substances;
s5, extruding the cooled substance into blocks, so that the conveying is convenient: and (3) pressurizing the cooled substance in the step (S4) to form blocks, so that the substance can be extruded into rectangular bodies with the same size, and the substance can be stored and transported conveniently.
Preferably, the aqueous solution is added in the step S1, the aqueous solution is distilled water cooled by high-temperature distillation, and the ratio of the distilled water to the semi-dry desulfurization waste ash is 2:1.
Preferably, when the distilled water and the semi-dry desulfurization waste ash are mixed, the distilled water and the semi-dry desulfurization waste ash are stirred and mixed by a stirrer, the rotating speed of the stirrer is kept at 300r/min-500r/min, and the stirring time is controlled at 30-40min.
Preferably, the semi-dry desulfurization waste ash in S1 is filtered after the aqueous solution reaction, and the precipitate is compressed and dried after the filtration so that the precipitate can be kept dry.
Preferably, the coking coal in the step S2 produces carbon monoxide in a low-oxygen high-temperature environment, the carbon monoxide reacts with ferric oxide in the semi-dry desulfurization waste ash, so that the ferric oxide can be replaced to produce molten iron, and the aluminum oxide generates liquid in the high-temperature environment and flows out together with the molten iron.
Preferably, the reaction formula of the carbon monoxide and ferric oxide in the semi-dry desulfurization waste ash is as follows:
2C+O2＝＝2CO
and the reactions are all carried out under the high-temperature low-oxygen environment.
Preferably, the high-temperature gas generated by the cooling roller during cooling is conveyed into the oxidation kiln through the induced draft fan, so that heat recycling is realized, the high-temperature gas and dust in the oxidation kiln are conveyed into the high-temperature reaction furnace through the induced draft fan for recycling, and the dust can be collected and reprocessed.
Preferably, the high-temperature gas and dust in the oxidation kiln are recovered and conveyed into the high-temperature reaction furnace through the cyclone blanking device before being conveyed, then the sulfur trioxide is absorbed through the relatively concentrated sulfuric acid, the concentrated sulfuric acid is reserved with crystal water, and the reaction equation is as follows: SO3+ h2o=h2so4.
Preferably, the reaction equation of the sulfuric acid in S1 and the calcium oxide in the semi-dry desulfurization waste ash to generate calcium sulfate solid is as follows:
SO3+H2O＝＝H2SO4
SO3+CaO＝＝CaSO4
SO3+Ca(OH)2＝＝CaSO4+H2O。
preferably, the cold air and the oxygen in the step S4 are respectively conveyed by an external air pump, and the pressurizing and blocking in the step S5 is performed by a 1000mpa hydraulic machine.
The technical scheme of the invention has the following beneficial effects:
the method has the advantages that the used substances are simple, the consumption of resources can be greatly reduced, the temperature is sequentially reduced through three-stage circulating heating and cooling, the resources can be effectively saved, the sulfur trioxide and the calcium oxide are reacted through the reaction and converted into the calcium sulfide compound, the waste ash can be reused, the waste ash is used for preparing cement, bricks and other building products with larger demand, and the metal substances in the semi-dry desulfurization waste ash can be effectively extracted through a high-temperature low-oxygen environment, so that the resource extraction and reuse can be realized, and the consumption of the resources is reduced.
Drawings
FIG. 1 is a schematic diagram of a process flow structure of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages to be solved more apparent, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.
The embodiment of the invention provides a technical scheme that:
as shown in FIG. 1, the recycling process of semi-dry desulfurization waste ash suitable for the electrolytic aluminum industry comprises the following steps:
s1, adding an aqueous solution into semi-dry desulfurization waste ash to enable sulfur trioxide to be dissolved: adding an aqueous solution into the semi-dry desulfurization waste ash, so that sulfur trioxide and water are generated into sulfuric acid, and reacting the sulfuric acid with calcium oxide in the semi-dry desulfurization waste ash at normal temperature to generate calcium sulfate solid;
s2, extracting iron and aluminum in the dry desulfurization waste ash under a high-temperature low-oxygen environment: the solid-liquid solution in the step S1 is filtered, compressed and dried, then coking coal is added into the semi-dry desulfurization waste ash, the semi-dry desulfurization waste ash and the coking coal are ground and crushed, the semi-dry desulfurization waste ash and the coking coal are ground into particles with the diameter of 0.3mm through a grinding device, the semi-dry desulfurization waste ash and the coking coal powder are tiled in a high-temperature reaction furnace, and the high-temperature reaction furnace is enabled to react in a low-oxygen high-temperature environment;
s3, slowly heating the reaction impurities in the S2 through an oxidation kiln to sublimate residual sulfur trioxide in the impurities: inputting reaction impurities into an oxidation kiln, heating the oxidation kiln through an external heating furnace and a burner, sublimating sulfur trioxide in the reaction impurities into gas at high temperature, discharging and absorbing the gas, and adsorbing the sulfur trioxide through an adsorption method;
s4, conveying the substances reacted in the step S3 into a cooling roller for cooling: the reaction substances in the step S3 are conveyed into the cooling roller through a conveying auger to be cooled in a rolling way, and cold air and oxygen are conveyed into the cooling roller at one end of the cooling roller to realize cooling and reaction prevention of the substances;
s5, extruding the cooled substance into blocks, so that the conveying is convenient: and (3) pressurizing the cooled substance in the step (S4) to form blocks, so that the substance can be extruded into rectangular bodies with the same size, and the substance can be stored and transported conveniently.
In order to reduce the resources and reduce the doping of the water substances into the semi-dry desulfurization waste ash, which results in an increase of impurities in the semi-dry desulfurization waste ash, in this embodiment, preferably, an aqueous solution is added in the step S1, and the aqueous solution is distilled water cooled by high-temperature distillation, and the ratio of the distilled water to the semi-dry desulfurization waste ash is listed as 2:1.
In order to improve the reaction rate and accelerate the reaction rate and make the reaction more sufficient, in this embodiment, preferably, when the distilled water and the semi-dry desulfurization waste ash are mixed, the distilled water and the semi-dry desulfurization waste ash are stirred and mixed by a stirrer, the rotation speed of the stirrer is kept at 300r/min, and the stirring duration is controlled at 40min.
In order to enable drying of the semi-dry desulfurization waste ash for convenient treatment, in this embodiment, it is preferable that the semi-dry desulfurization waste ash in S1 is filtered after the aqueous solution reaction, and the precipitate is compressed and dried after the filtration so that the precipitate can be kept dry.
In order to replace the metal iron and extract the metal substances in the semi-dry desulfurization waste ash, in this embodiment, preferably, the coking coal in S2 produces carbon monoxide in a low-oxygen high-temperature environment, the carbon monoxide reacts with the ferric oxide in the semi-dry desulfurization waste ash to enable the ferric oxide to be replaced, so as to produce molten iron, and the generated liquid of the ferric oxide and the molten iron flow out together in the high-temperature environment.
In order to replace the metallic iron, in this embodiment, preferably, the reaction formula of the carbon monoxide and the ferric oxide in the semi-dry desulfurization waste ash is as follows:
2C+O2＝＝2CO
and the reactions are all carried out under the high-temperature low-oxygen environment.
In order to realize recycling of heat of reaction and reduce consumption of resources, in this embodiment, preferably, high-temperature gas generated when the cooling roller cools is conveyed to the oxidation kiln through the induced draft fan, so as to realize recycling of heat, and high-temperature gas and dust in the oxidation kiln are conveyed to the high-temperature reaction furnace through the induced draft fan for recycling, and the dust can be collected and reprocessed.
In order to realize the absorption of the high-temperature sublimated sulfur trioxide and the recovery of the waste ash and prevent the pollution of air, in this embodiment, preferably, the high-temperature gas and the dust in the oxidation kiln are recovered and conveyed into the high-temperature reaction furnace through the cyclone blanking device before being conveyed, then the sulfur trioxide is absorbed through the relatively concentrated sulfuric acid, and the concentrated sulfuric acid has the crystallization water remained therein, and the reaction equation is as follows: SO3+ h2o=h2so4.
In order to enable the production of stable calcium sulfide from sulfur trioxide and calcium oxide, in this embodiment, preferably, the reaction equation of the sulfuric acid in S1 with the calcium oxide in the semi-dry desulfurization waste ash to generate calcium sulfate solid is as follows:
SO3+H2O＝＝H2SO4
SO3+CaO＝＝CaSO4
SO3+Ca(OH)2＝＝CaSO4+H2O。
in order to realize the delivery of the cold air and the oxygen and to enable the waste ash to be stored and transported conveniently, in this embodiment, preferably, the cold air and the oxygen in S4 are respectively delivered by an external air pump, and the pressurizing and blocking in S5 is performed by a 1000mpa hydraulic press.
Embodiment two:
a recycling process suitable for semi-dry desulfurization waste ash in electrolytic aluminum industry comprises the following steps:
s1, adding an aqueous solution into semi-dry desulfurization waste ash to enable sulfur trioxide to be dissolved: adding an aqueous solution into the semi-dry desulfurization waste ash, so that sulfur trioxide and water are generated into sulfuric acid, and reacting the sulfuric acid with calcium oxide in the semi-dry desulfurization waste ash at normal temperature to generate calcium sulfate solid;
s2, extracting iron and aluminum in the dry desulfurization waste ash under a high-temperature low-oxygen environment: the solid-liquid solution in the step S1 is filtered, compressed and dried, then coking coal is added into the semi-dry desulfurization waste ash, the semi-dry desulfurization waste ash and the coking coal are ground and crushed, the semi-dry desulfurization waste ash and the coking coal are ground into particles with the diameter of 0.6mm through a grinding device, the semi-dry desulfurization waste ash and the coking coal powder are tiled in a high-temperature reaction furnace, and the high-temperature reaction furnace is enabled to react in a low-oxygen high-temperature environment;
s3, slowly heating the reaction impurities in the S2 through an oxidation kiln to sublimate residual sulfur trioxide in the impurities: inputting reaction impurities into an oxidation kiln, heating the oxidation kiln through an external heating furnace and a burner, sublimating sulfur trioxide in the reaction impurities into gas at high temperature, discharging and absorbing the gas, and adsorbing the sulfur trioxide through an adsorption method;
s4, conveying the substances reacted in the step S3 into a cooling roller for cooling: the reaction substances in the step S3 are conveyed into the cooling roller through a conveying auger to be cooled in a rolling way, and cold air and oxygen are conveyed into the cooling roller at one end of the cooling roller to realize cooling and reaction prevention of the substances;
s5, extruding the cooled substance into blocks, so that the conveying is convenient: and (3) pressurizing the cooled substance in the step (S4) to form blocks, so that the substance can be extruded into rectangular bodies with the same size, and the substance can be stored and transported conveniently.
In order to reduce the resources and reduce the doping of the water substances into the semi-dry desulfurization waste ash, which results in an increase of impurities in the semi-dry desulfurization waste ash, in this embodiment, preferably, an aqueous solution is added in the step S1, and the aqueous solution is distilled water cooled by high-temperature distillation, and the ratio of the distilled water to the semi-dry desulfurization waste ash is listed as 2:1.
In order to improve the reaction rate and accelerate the reaction rate and make the reaction more sufficient, in this embodiment, preferably, when the distilled water and the semi-dry desulfurization waste ash are mixed, the distilled water and the semi-dry desulfurization waste ash are stirred and mixed by a stirrer, the rotation speed of the stirrer is kept at 500r/min, and the stirring duration is controlled at 30min.
In order to enable drying of the semi-dry desulfurization waste ash for convenient treatment, in this embodiment, it is preferable that the semi-dry desulfurization waste ash in S1 is filtered after the aqueous solution reaction, and the precipitate is compressed and dried after the filtration so that the precipitate can be kept dry.
In order to replace the metal iron and extract the metal substances in the semi-dry desulfurization waste ash, in this embodiment, preferably, the coking coal in S2 produces carbon monoxide in a low-oxygen high-temperature environment, the carbon monoxide reacts with the ferric oxide in the semi-dry desulfurization waste ash to enable the ferric oxide to be replaced, so as to produce molten iron, and the generated liquid of the ferric oxide and the molten iron flow out together in the high-temperature environment.
In order to replace the metallic iron, in this embodiment, preferably, the reaction formula of the carbon monoxide and the ferric oxide in the semi-dry desulfurization waste ash is as follows:
2C+O2＝＝2CO
and the reactions are all carried out under the high-temperature low-oxygen environment.
In order to realize recycling of heat of reaction and reduce consumption of resources, in this embodiment, preferably, high-temperature gas generated when the cooling roller cools is conveyed to the oxidation kiln through the induced draft fan, so as to realize recycling of heat, and high-temperature gas and dust in the oxidation kiln are conveyed to the high-temperature reaction furnace through the induced draft fan for recycling, and the dust can be collected and reprocessed.
In order to realize the absorption of the high-temperature sublimated sulfur trioxide and the recovery of the waste ash and prevent the pollution of air, in this embodiment, preferably, the high-temperature gas and the dust in the oxidation kiln are recovered and conveyed into the high-temperature reaction furnace through the cyclone blanking device before being conveyed, then the sulfur trioxide is absorbed through the relatively concentrated sulfuric acid, and the concentrated sulfuric acid has the crystallization water remained therein, and the reaction equation is as follows: SO3+ h2o=h2so4.
In order to enable the production of stable calcium sulfide from sulfur trioxide and calcium oxide, in this embodiment, preferably, the reaction equation of the sulfuric acid in S1 with the calcium oxide in the semi-dry desulfurization waste ash to generate calcium sulfate solid is as follows:
SO3+H2O＝＝H2SO4
SO3+CaO＝＝CaSO4
SO3+Ca(OH)2＝＝CaSO4+H2O。
in order to realize the delivery of the cold air and the oxygen and to enable the waste ash to be stored and transported conveniently, in this embodiment, preferably, the cold air and the oxygen in S4 are respectively delivered by an external air pump, and the pressurizing and blocking in S5 is performed by a 1000mpa hydraulic press.
Through the technical scheme, substances in the semi-dry desulfurization waste ash can be extracted and converted, the stability of the substances in the semi-dry desulfurization waste ash can be effectively improved, valuable substances in the semi-dry desulfurization waste ash can be effectively improved, harmful substances are removed, the semi-dry desulfurization waste ash can be reused, the utilization rate is improved, and the content of the substances in the semi-dry desulfurization waste ash is as follows:
the working principle and the using flow of the invention are as follows:
the first step, adding an aqueous solution into semi-dry desulfurization waste ash to enable sulfur trioxide to be dissolved: adding an aqueous solution into the semi-dry desulfurization waste ash, so that sulfur trioxide and water are generated into sulfuric acid, and reacting the sulfuric acid with calcium oxide in the semi-dry desulfurization waste ash at normal temperature to generate calcium sulfate solid;
secondly, extracting iron and aluminum in the dry desulfurization waste ash under a high-temperature low-oxygen environment: filtering, compressing and drying the solid-liquid solution in the step S1, adding coking coal into the semi-dry desulfurization waste ash, grinding and crushing the semi-dry desulfurization waste ash and the coking coal, grinding the semi-dry desulfurization waste ash and the coking coal into particles with the diameter of 0.3-0.6mm by a grinding device, spreading the semi-dry desulfurization waste ash and the coking coal powder in a high-temperature reaction furnace, and enabling the high-temperature reaction furnace to react in a low-oxygen high-temperature environment;
thirdly, slowly heating the reaction impurities in the step S2 through an oxidation kiln to sublimate residual sulfur trioxide in the impurities: inputting reaction impurities into an oxidation kiln, heating the oxidation kiln through an external heating furnace and a burner, sublimating sulfur trioxide in the reaction impurities into gas at high temperature, discharging and absorbing the gas, and adsorbing the sulfur trioxide through an adsorption method;
fourthly, conveying the substances reacted in the step S3 into a cooling roller for cooling: the reaction substances in the step S3 are conveyed into the cooling roller through a conveying auger to be cooled in a rolling way, and cold air and oxygen are conveyed into the cooling roller at one end of the cooling roller to realize cooling and reaction prevention of the substances;
and fifthly, extruding the cooled substance into blocks, so that the conveying is convenient: and (3) pressurizing the cooled substance in the step (S4) to form blocks, so that the substance can be extruded into rectangular bodies with the same size, and the substance can be stored and transported conveniently.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the present invention.
Claims (5)
1. The recycling process suitable for the semi-dry desulfurization waste ash in the electrolytic aluminum industry is characterized by comprising the following steps of:
s1, adding an aqueous solution into semi-dry desulfurization waste ash to enable sulfur trioxide to be dissolved: adding an aqueous solution into the semi-dry desulfurization waste ash so as to enable sulfur trioxide and water to react with calcium oxide in the semi-dry desulfurization waste ash to generate calcium sulfate solid at normal temperature, wherein the aqueous solution is distilled water cooled through high-temperature distillation, the ratio of the distilled water to the semi-dry desulfurization waste ash is 2:1, stirring and mixing are carried out through a stirrer, the rotating speed of the stirrer is kept at 300-500r/min, and the stirring time is controlled at 30-40min;
s2, extracting iron and aluminum in the dry desulfurization waste ash under a high-temperature low-oxygen environment: filtering, compressing and drying the solid-liquid solution in the step S1, adding coking coal into the semi-dry desulfurization waste ash, grinding and crushing the semi-dry desulfurization waste ash and the coking coal, grinding the semi-dry desulfurization waste ash and the coking coal into particles with the diameter of 0.3-0.6mm by a grinding device, spreading the semi-dry desulfurization waste ash and the coking coal powder in a high-temperature reaction furnace, reacting the high-temperature reaction furnace in a low-oxygen high-temperature environment, wherein the coking coal produces carbon monoxide in the low-oxygen high-temperature environment, reacting the carbon monoxide with ferric oxide in the semi-dry desulfurization waste ash, displacing the ferric oxide, producing iron liquid, and generating liquid and the iron liquid together from aluminum oxide in the high-temperature environment, and reacting the reactions in the high-temperature low-oxygen environment;
s3, slowly heating the reaction impurities in the step S2 through an oxidation kiln, and sublimating residual sulfur trioxide in the impurities: the method comprises the steps of inputting reaction impurities into an oxidation kiln, heating the oxidation kiln through an external heating furnace and a burner, sublimating sulfur trioxide in the reaction impurities into gas at high temperature, discharging and absorbing the gas, and adsorbing the sulfur trioxide through an adsorption method;
s4, conveying the substances reacted in the step S3 into a cooling roller for cooling: the reaction substances in the step S3 are conveyed into the cooling roller through a conveying auger to be cooled in a rolling way, and cold air and oxygen are conveyed into the cooling roller at one end of the cooling roller to realize cooling and reaction prevention of the substances;
s5, extruding the cooled substance into blocks, so that the conveying is convenient: pressurizing and blocking the cooled substances in the step S4, and pressurizing and blocking by adopting a hydraulic press of 1000MPa, so that the substances can be extruded into rectangular bodies with the same size, and the substances are convenient to store and transport;
the high-temperature gas generated when the cooling roller is cooled is conveyed into the oxidation kiln through the induced draft fan, so that the cyclic utilization of heat is realized, the high-temperature gas and dust in the oxidation kiln are conveyed into the high-temperature reaction furnace through the induced draft fan for cyclic utilization, and the dust is collected and reprocessed;
the high-temperature gas and dust in the oxidation kiln are recovered and conveyed into the high-temperature reaction furnace through the cyclone blanking device before being conveyed, then the sulfur trioxide is absorbed through the concentrated sulfuric acid, the concentrated sulfuric acid is reserved with crystal water, and the reaction equation is as follows: SO (SO) 3 +H 2 O＝H 2 SO 4 。
2. The recycling process for semi-dry desulfurization waste ash in the electrolytic aluminum industry according to claim 1, which is characterized in that: the semi-dry desulfurization waste ash in S1 is filtered after the aqueous solution reaction, and the precipitate is compressed and dried after the filtration so that the precipitate can be kept dry.
3. The recycling process for semi-dry desulfurization waste ash in the electrolytic aluminum industry according to claim 1, which is characterized in that: the reaction formula of the ferric oxide in the carbon monoxide and the semi-dry desulfurization waste ash is as follows:
2C+O 2 ＝＝2CO
。
4. the recycling process for semi-dry desulfurization waste ash in the electrolytic aluminum industry according to claim 1, which is characterized in that: the reaction equation of the sulfuric acid in the S1 and the calcium oxide in the semi-dry desulfurization waste ash to generate calcium sulfate solid is shown as follows:
SO 3 +H 2 O＝＝H 2 SO 4
SO 3 +CaO＝＝CaSO 4
SO 3 +Ca(OH) 2 ＝＝CaSO 4 +H 2 O。
5. the recycling process for semi-dry desulfurization waste ash in the electrolytic aluminum industry according to claim 1, which is characterized in that: and the cold air and the oxygen in the step S4 are respectively conveyed through an external air pump.
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