CN103663510A - Method for preparing aluminum oxide by using hydrochloric acid treatment coal ash - Google Patents
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Abstract
The invention discloses a method for preparing aluminum oxide by using hydrochloric acid treatment coal ash. The method comprises the steps: activating coal ash; mixing the activated coal ash with hydrochloric acid with the concentration of 5-10 percent; feeding mixed slurries into a heat exchanger to be heated to be between 90 and 200 DEG C; feeding the heated slurries into a reactor; adding hydrogen chloride gas into the reactor and reacting for 1-8 hours; separating solid from the liquid after reaction is finished and the temperature is reduced to obtain aluminum chloride and ferric chloride solution and high silicon slag; evaporating and condensing or drying to obtain crystallized aluminum chloride and ferric chloride; heating and decomposing the crystallized aluminum chloride to obtain coarse gamma-Al2O3 containing a large number of impurities and hydrogen chloride gas; and treating coarse gamma-Al2O3 by using the Bayer process to prepare metallurgical-level aluminum oxide, wherein residual slag is high iron slag and can be used an iron-making raw material. According to the method, the problem of severe corrosion of the equipment can be avoided, aluminum oxide in the coal ash is effectively leached, and the produced aluminum oxide can meet the industrial requirement of electrolytic aluminum.
Description
Technical field
The present invention relates to a kind of industrial solid castoff processing and utilizing and produce the method for aluminum oxide, relate in particular to a kind of method that hydrochloric acid treated coal ash is prepared aluminum oxide.
Background technology
Flyash is the solid waste that coal-burning power plant discharges.At present, the more than one hundred million tons of China's flyash annual emissions, total volume of cargo in storage of China's flyash has tens00000000 tons.A large amount of soils are are not only occupied in the discharge of a large amount of flyash, and serious environment pollution, have formed the dual destruction to ecosystem environment.Therefore the comprehensive utilization of carrying out flyash has Great significance and long-range strategic importance.Equally, China is a country that bauxite resource is not rich, and the assurance degree of 45 kinds of Prospecting Target of The Main Minerals of China to demand in 2010 that had document announcement have 10 kinds of mineral products to belong to and can not guarantee, comprising bauxite.Waste in exploiting, utilize according to rate of growth and the bauxite of current aluminum oxide output, even if consider prospective reserves, the time limit of the bauxite of China is also difficult to reach 50 years.So the method that solves this crisis of resource has two kinds: the one, rationally utilize existing bauxite resource; The 2nd, actively look for and utilize other to contain bauxite resource.And aluminum oxide is one of main component of flyash, its massfraction is generally 15% ~ 40%, reaches as high as 58%.So, carry out and from flyash, extract the pollution that the research work of aluminum oxide can solve flyash, turn waste into wealth.
At present, from flyash, extract aluminum oxide research comparative maturity have limestone sintering method and a soda-lime sintering process, both are commonly referred to as alkaline process for this.In December, 2004, Inner Mongolia Autonomous Region Science and Technology Department held " flyash extracts aluminum and coproducing cement industrialization technology " project appraisal of scientific and technological achievements meeting of Liao Mengxi new and high technology Group Co.,Ltd research and development, what adopt is exactly improved soda-lime sintering process, this group has independently completed the pilot scale of nearly 5000 tonnes, and obtains multinomial patent.But in alkaline process extract powder coal ash also there are some problems in aluminum oxide, it is mainly the calcium silicate slag that 1. sintering process produces, can only be used as cement raw material, the aluminum oxide that every production is 1 ton will produce the calcium silicate slag that is several times as much as flyash, and cement has its corresponding radius of selling, if local, do not have large-scale Cement industry support will cause secondary pollution; 2. sintering process has only been extracted the aluminum oxide in flyash, and the utility value of its silicon-dioxide is low.3. the facility investment of sintering process treated coal ash is large, and energy consumption is high, and cost is high.
Because the alumina silica ratio of flyash is very low, be generally all less than 1, so adopt acidic process flyash more reasonable in principle.Acid system leaches the aluminum oxide in flyash, can make the aluminium salt generating enter solution, silicon not with acid-respons, completely in solid phase slag.Acidic process flyash can overcome the deficiency of sintering process, can not produce the solid waste more than raw material powder coal ash, and extracts after aluminum oxide, silicon-dioxide meeting enrichment, and in slag, its content can reach 80 ~ 90%, is so more conducive to its utilization.Because flyash is cooling rapidly after high-temp combustion, so glassy phase accounts for significant proportion, its chemically reactive is very low, therefore, improve the extraction yield of aluminum oxide in flyash and will start with from improving the chemically reactive of flyash.The method of document announcement is in acid-leaching reaction, to add fluorochemical hydrotropy at present, silicon is combined with fluorine, reach and discharge the wherein object of aluminum oxide, but may produce the obnoxious flavoures such as HF in the process of hydrotropy, in the process of removing fluorine purifying, can discharge fluorine-containing waste liquid and waste residue again, not only pollute the environment, and can cause the potential safety hazard to operator.
Adopt the aluminum oxide in salt acid system leaching flyash, the mixed serum of hydrochloric acid and flyash need to be heated to 130 ~ 180 ℃, and the necessary concentration of hydrochloric acid is higher to guarantee the leaching yield of aluminum oxide in flyash, under the condition of concentrated hydrochloric acid, heat-processed equipment corrosion is serious, has seriously restricted development and the application of salt acid system.Under this background, the present invention adopts hydrogen chloride gas directly to enter reactor, and does not participate in heat-processed, has both guaranteed the concentration of hydrochloric acid that reaction process is required, by the corrosion harmfulness of avoiding concentrated hydrochloric acid heat-processed to bring.
Summary of the invention
For solving the problems of the technologies described above a kind of method that hydrochloric acid treated coal ash is prepared aluminum oxide that the invention provides, object is to solve the heat-processed equipment heavy corrosion problem that salt acid system brings, and produces the metallurgical-grade aluminum oxide that is applicable to Aluminium Industry.
A kind of hydrochloric acid treated coal ash of the present invention is prepared the method for aluminum oxide for achieving the above object, comprises the steps: that (1) is by flyash activating; (2) by the flyash after activation and the mixed in hydrochloric acid of 5% ~ 10% concentration, mixed slurries are sent in heat exchanger, are heated to 90 ℃ ~ 200 ℃; (3) slip after heating is sent in reactor, in reactor, add hydrogen chloride gas, in overall HCl and flyash, the mol ratio of aluminum oxide and ferric oxide is 4 ~ 9 simultaneously, and a part of HCl adds by step (2), residue HCl adds at this, reaction times 1 h ~ 8h; (4) solid-liquid separation after reaction cooling, obtains aluminum chloride and ferric chloride Solution and high white residue, evaporation concentration or dry after obtain crystal aluminum chloride and iron(ic) chloride; (5) crystal aluminum chloride thermal degradation obtains the thick γ-Al that contains a large amount of impurity
2o
3and hydrogen chloride gas; (6) thick γ-Al
2o
3adopt bayer process to process and prepare metallurgical-grade aluminum oxide, residue is high scum, can be used as iron-smelting raw material.
Described activation is a kind of of mechanical activation or thermal activation.
Described mechanical activation adopts a kind of in vibration mill, vertical mill, planetary mills or high-energy ball milling.
Described thermal activation is that flyash is heated to 230 ℃ ~ 800 ℃.
Described heat exchanger is a kind of in direct heat exchanger or indirect heat exchanger.
Described indirect heat exchanger adds a kind of as thermal source in thermal recovery saturation steam, superheated vapour, thermal oil or fused salt.
Described direct heat exchanger adds a kind of as thermal source in thermal recovery saturation steam or superheated vapour.
The liner of described reactor is a kind of in acid-proof ceramic tile, enamel, glass, fluoroplastics or tetrafluoroethylene.
In step 4, the solid-liquid separation of liquor alumini chloridi and slag adopts a kind of in flocculating settling, pressure filtration or vacuum filtration.
The one or more combination that described liquor alumini chloridi evaporative crystallization adopts multiple-effect falling film evaporation, forced circulation evaporation crystallization, drum dried or sprays in being dried.
Described crystal aluminum chloride decomposition temperature is 400 ℃ ~ 800 ℃, obtains thick γ-Al
2o
3and hydrogen chloride gas.
Hydrogen chloride gas is dried, adopts a kind of of the dry or molecular sieve drying of the vitriol oil.
Described bayer process is processed thick γ-Al
2o
3prepare metallurgical-grade aluminum oxide process and comprise raw pulp allotment, low temperature stripping, high scum separating, washing, essence filter, seminal fluid cooling, seed decomposition, seed preparation, aluminium hydroxide separating, washing, Aluminium hydroxide roasting, aluminum oxide packing and accumulating and mother liquid evaporation operation.
Described high white residue is used for preparing high silicon filler, white carbon black, silica gel or water glass.
Dry hydrogen chloride gas is delivered in reactor.
Advantageous effect of the present invention: the present invention adopts flyash activating technology, does not add any auxiliary agent, can make aluminum oxide in flyash effectively leach, and the leaching yield of aluminum oxide can reach more than 80%.The present invention has realized the circulation of sour circulation and alkali, and whole process does not have the discharge of waste gas, waste liquid, waste residue.The present invention adopts hydrogen chloride gas directly to enter reactor, and does not participate in heat-processed, has both guaranteed the concentration of hydrochloric acid that reaction process is required, by the corrosion harmfulness of avoiding concentrated hydrochloric acid heat-processed to bring, makes whole technique more be beneficial to industrialization.
Accompanying drawing explanation
Fig. 1 is process flow sheet of the present invention.
Embodiment
Raw material powder coal ash consists of: Al
2o
3: 41%, SiO
2: 48%, Fe
2o
3: 3.3%, CaO:3.3%, TiO
2: 1.3%, MgO:0.2%.Flyash in following embodiment is 1000kg.The composition of raw material powder coal ash also can adopt other moiety and concrete consumption, and the flyash of any routine is all passable, and this can not be for limiting protection scope of the present invention.
embodiment 1
Flyash is adopted to the activation of vibration mill machinery, the supplementary hydrochloric acid of 5% concentration and washing lotion and flyash are mixed into slip, in indirect heat exchanger, with after saturation steam indirect heating to 160 ℃, send in the reactor that liner is acid-proof ceramic tile, pass into the hydrogen chloride gas through vitriol oil dried recovered, in hydrogenchloride and above-mentioned supplementary hydrochloric acid, in HCl and flyash, the mol ratio of the summation of aluminum oxide and ferric oxide is 6.5, reaction times 2h, solid-liquid separation after reaction cooling, obtain aluminum chloride liquid, the solid-liquid separation of liquor alumini chloridi and high white residue adopts flocculating settling, aluminum chloride liquid adopts the dry crystal aluminum chloride that obtains of spraying, aluminum chloride crystal decomposes and obtains thick γ-Al at 400 ℃
2o
3and hydrogen chloride gas, hydrogenchloride is realized recycle by vitriol oil dried recovered.Thick γ-Al that calcining obtains
2o
3through bayer process process, obtain standard compliant metallurgical-grade aluminum oxide and high scum.Bayer process is processed thick γ-Al
2o
3prepare metallurgical-grade aluminum oxide process and comprise raw pulp allotment, low temperature stripping, high scum separating, washing, essence filter, seminal fluid cooling, seed decomposition, seed preparation, aluminium hydroxide separating, washing, Aluminium hydroxide roasting, aluminum oxide packing and accumulating and mother liquid evaporation operation.High white residue is used for preparing high silicon filler.High scum is used for smelting iron.
embodiment 2
Raw material powder coal ash in embodiment 1 is adopted to the activation of vertical mill machinery, the supplementary hydrochloric acid of 10% concentration and washing lotion and flyash are mixed into slip, in indirect heat exchanger, with after superheated vapour indirect heating to 190 ℃, send in the reactor that liner is enamel, pass into the hydrogen chloride gas through vitriol oil dried recovered, in hydrogenchloride and above-mentioned supplementary hydrochloric acid, in HCl and flyash, the mol ratio of the summation of aluminum oxide and ferric oxide is 7.5, reaction times 3h, solid-liquid separation after reaction cooling, obtain aluminum chloride liquid, the solid-liquid separation of liquor alumini chloridi and high white residue adopts flocculating settling, aluminum chloride liquid adopts drum dried to obtain crystal aluminum chloride, aluminum chloride crystal decomposes and obtains thick γ-Al at 500 ℃
2o
3and hydrogen chloride gas, hydrogenchloride reclaims and realizes recycle by molecular sieve drying.Thick γ-Al that calcining obtains
2o
3through bayer process process, obtain standard compliant metallurgical-grade aluminum oxide and high scum.Bayer process is processed thick γ-Al
2o
3prepare metallurgical-grade aluminum oxide process and comprise raw pulp allotment, low temperature stripping, high scum separating, washing, essence filter, seminal fluid cooling, seed decomposition, seed preparation, aluminium hydroxide separating, washing, Aluminium hydroxide roasting, aluminum oxide packing and accumulating and mother liquid evaporation operation.High white residue is used for preparing white carbon black.High scum is used for smelting iron.
embodiment 3
Raw material powder coal ash in embodiment 1 is adopted to the activation of planetary mills machinery, 8% concentration is supplemented to hydrochloric acid and washing lotion and flyash and be mixed into slip, in indirect heat exchanger, with after thermal oil indirect heating to 200 ℃, send in the reactor that liner is glass, pass into the hydrogen chloride gas through vitriol oil dried recovered, in hydrogenchloride and above-mentioned supplementary hydrochloric acid, in HCl and flyash, the mol ratio of the summation of aluminum oxide and ferric oxide is 9, reaction times 1h, solid-liquid separation after reaction cooling, obtain aluminum chloride liquid, the solid-liquid separation of liquor alumini chloridi and high white residue adopts flocculating settling, aluminum chloride liquid adopts forced circulation evaporation crystallization to obtain crystal aluminum chloride, aluminum chloride crystal decomposes and obtains thick γ-Al at 600 ℃
2o
3and hydrogen chloride gas, hydrogenchloride is realized recycle by vitriol oil dried recovered.Thick γ-Al that calcining obtains
2o
3through bayer process process, obtain standard compliant metallurgical-grade aluminum oxide and high scum.Bayer process is processed thick γ-Al
2o
3prepare metallurgical-grade aluminum oxide process and comprise raw pulp allotment, low temperature stripping, high scum separating, washing, essence filter, seminal fluid cooling, seed decomposition, seed preparation, aluminium hydroxide separating, washing, Aluminium hydroxide roasting, aluminum oxide packing and accumulating and mother liquid evaporation operation.High white residue is used for preparing high silicon filler or water glass.High scum is used for smelting iron.
embodiment 4
Raw material powder coal ash in embodiment 1 is adopted to the activation of high-energy ball milling machinery, 6% concentration is supplemented to hydrochloric acid and washing lotion and flyash and be mixed into slip, in indirect heat exchanger, with after fused salt indirect heating to 150 ℃, send in the reactor that liner is acidproof fluoroplastics, pass into the hydrogen chloride gas through vitriol oil dried recovered, in hydrogenchloride and above-mentioned supplementary hydrochloric acid, in HCl and flyash, the mol ratio of the summation of aluminum oxide and ferric oxide is 5.5, reaction times 3.5h, solid-liquid separation after reaction cooling, obtain aluminum chloride liquid, the solid-liquid separation of liquor alumini chloridi and high white residue adopts flocculating settling, aluminum chloride liquid adopts multiple-effect falling film evaporation to obtain crystal aluminum chloride, aluminum chloride crystal decomposes and obtains thick γ-Al at 500 ℃
2o
3and hydrogen chloride gas, hydrogenchloride is realized recycle by vitriol oil dried recovered.Thick γ-Al that calcining obtains
2o
3through bayer process process, obtain standard compliant metallurgical-grade aluminum oxide and high scum.Bayer process is processed thick γ-Al
2o
3prepare metallurgical-grade aluminum oxide process and comprise raw pulp allotment, low temperature stripping, high scum separating, washing, essence filter, seminal fluid cooling, seed decomposition, seed preparation, aluminium hydroxide separating, washing, Aluminium hydroxide roasting, aluminum oxide packing and accumulating and mother liquid evaporation operation.High white residue is used for preparing silica gel.High scum is used for smelting iron.
embodiment 5
By the raw material powder coal ash heat-activated in embodiment 1, 800 ℃ of activation temperatures, 7% concentration is supplemented to hydrochloric acid and washing lotion and flyash and be mixed into slip, in direct heat exchanger, with after superheated vapour direct heating to 120 ℃, send in the reactor that liner is tetrafluoroethylene, pass into the hydrogen chloride gas reclaiming through molecular sieve drying, in hydrogenchloride and above-mentioned supplementary hydrochloric acid, in HCl and flyash, the mol ratio of the summation of aluminum oxide and ferric oxide is 6.5, reaction times 4h, solid-liquid separation after reaction cooling, obtain aluminum chloride liquid, the solid-liquid separation of liquor alumini chloridi and high white residue adopts flocculating settling, aluminum chloride liquid adopts the dry crystal aluminum chloride that obtains of spraying, aluminum chloride crystal decomposes and obtains thick γ-Al at 650 ℃
2o
3and hydrogen chloride gas, hydrogenchloride is realized recycle by vitriol oil dried recovered.Thick γ-Al that calcining obtains
2o
3through bayer process process, obtain standard compliant metallurgical-grade aluminum oxide and high scum.Bayer process is processed thick γ-Al
2o
3prepare metallurgical-grade aluminum oxide process and comprise raw pulp allotment, low temperature stripping, high scum separating, washing, essence filter, seminal fluid cooling, seed decomposition, seed preparation, aluminium hydroxide separating, washing, Aluminium hydroxide roasting, aluminum oxide packing and accumulating and mother liquid evaporation operation.High white residue is used for preparing water glass.High scum is used for smelting iron.
embodiment 6
By the raw material powder coal ash heat-activated in embodiment 1, 600 ℃ of activation temperatures, 9% concentration is supplemented to hydrochloric acid and washing lotion and flyash and be mixed into slip, in direct heat exchanger, with after saturation steam direct heating to 90 ℃, send in the reactor that liner is tetrafluoroethylene, pass into the hydrogen chloride gas reclaiming through molecular sieve drying, in hydrogenchloride and above-mentioned supplementary hydrochloric acid, in HCl and flyash, the mol ratio of the summation of aluminum oxide and ferric oxide is 6.5, reaction times 8h, solid-liquid separation after reaction cooling, obtain aluminum chloride liquid, the solid-liquid separation of liquor alumini chloridi and high white residue adopts flocculating settling, aluminum chloride liquid adopts the dry crystal aluminum chloride that obtains of spraying, aluminum chloride crystal decomposes and obtains thick γ-Al at 500 ℃
2o
3and hydrogen chloride gas, hydrogenchloride is realized recycle by vitriol oil dried recovered.Thick γ-Al that calcining obtains
2o
3through bayer process process, obtain standard compliant metallurgical-grade aluminum oxide and high scum.Bayer process is processed thick γ-Al
2o
3prepare metallurgical-grade aluminum oxide process and comprise raw pulp allotment, low temperature stripping, high scum separating, washing, essence filter, seminal fluid cooling, seed decomposition, seed preparation, aluminium hydroxide separating, washing, Aluminium hydroxide roasting, aluminum oxide packing and accumulating and mother liquid evaporation operation.High white residue is used for preparing high silicon filler, white carbon black, silica gel and water glass.High scum is used for smelting iron.
embodiment 7
By the raw material powder coal ash heat-activated in embodiment 1, 230 ℃ of activation temperatures, 7% concentration is supplemented to hydrochloric acid and washing lotion and flyash and be mixed into slip, in direct heat exchanger, with after superheated vapour direct heating to 130 ℃, send in the reactor that liner is tetrafluoroethylene, pass into the hydrogen chloride gas reclaiming through molecular sieve drying, in hydrogenchloride and above-mentioned supplementary hydrochloric acid, in HCl and flyash, the mol ratio of the summation of aluminum oxide and ferric oxide is 6, reaction times 5h, solid-liquid separation after reaction cooling, obtain aluminum chloride liquid, the solid-liquid separation of liquor alumini chloridi and high white residue adopts vacuum filtration, aluminum chloride liquid adopts the dry crystal aluminum chloride that obtains of spraying, aluminum chloride crystal decomposes and obtains thick γ-Al at 650 ℃
2o
3and hydrogen chloride gas, hydrogenchloride is realized recycle by vitriol oil dried recovered.Thick γ-Al that calcining obtains
2o
3through bayer process process, obtain standard compliant metallurgical-grade aluminum oxide and high scum.Bayer process is processed thick γ-Al
2o
3prepare metallurgical-grade aluminum oxide process and comprise raw pulp allotment, low temperature stripping, high scum separating, washing, essence filter, seminal fluid cooling, seed decomposition, seed preparation, aluminium hydroxide separating, washing, Aluminium hydroxide roasting, aluminum oxide packing and accumulating and mother liquid evaporation operation.High white residue is used for preparing high silicon filler.High scum is used for smelting iron.
embodiment 8
By the raw material powder coal ash heat-activated in embodiment 1, 350 ℃ of activation temperatures, to supplement hydrochloric acid and washing lotion and flyash and be mixed into slip, with after superheated vapour direct heating to 110 ℃, send in the reactor that liner is tetrafluoroethylene, pass into the hydrogen chloride gas reclaiming through molecular sieve drying, in hydrogenchloride and above-mentioned supplementary hydrochloric acid, in HCl and flyash, the mol ratio of the summation of aluminum oxide and ferric oxide is 4, reaction times 3.5h, solid-liquid separation after reaction cooling, obtain aluminum chloride liquid, the solid-liquid separation of liquor alumini chloridi and high white residue adopts pressure filtration, aluminum chloride liquid adopts the dry crystal aluminum chloride that obtains of spraying, aluminum chloride crystal decomposes and obtains thick γ-Al at 800 ℃
2o
3and hydrogen chloride gas, hydrogenchloride is realized recycle by vitriol oil dried recovered.Thick γ-Al that calcining obtains
2o
3through bayer process process, obtain standard compliant metallurgical-grade aluminum oxide and high scum.Bayer process is processed thick γ-Al
2o
3prepare metallurgical-grade aluminum oxide process and comprise raw pulp allotment, low temperature stripping, high scum separating, washing, essence filter, seminal fluid cooling, seed decomposition, seed preparation, aluminium hydroxide separating, washing, Aluminium hydroxide roasting, aluminum oxide packing and accumulating and mother liquid evaporation operation.High white residue is used for preparing high silicon filler.High scum is used for smelting iron.
Claims (15)
1. hydrochloric acid treated coal ash is prepared a method for aluminum oxide, it is characterized in that comprising the steps:
(1) by flyash activating;
(2) by the flyash after activation and the mixed in hydrochloric acid of 5% ~ 10% concentration, mixed slurries are sent in heat exchanger, are heated to 90 ℃ ~ 200 ℃;
(3) slip after heating is sent in reactor, in reactor, add hydrogen chloride gas, in overall HCl and flyash, the mol ratio of aluminum oxide and ferric oxide is 4 ~ 9 simultaneously, and a part of HCl adds by step (2), residue HCl adds at this, reaction times 1 h ~ 8h;
(4) solid-liquid separation after reaction cooling, obtains aluminum chloride and ferric chloride Solution and high white residue, evaporation concentration or dry after obtain crystal aluminum chloride and iron(ic) chloride;
(5) crystal aluminum chloride thermal degradation obtains the thick γ-Al that contains a large amount of impurity
2o
3and hydrogen chloride gas;
(6) thick γ-Al
2o
3adopt bayer process to process and prepare metallurgical-grade aluminum oxide, residue is high scum, can be used as iron-smelting raw material.
2. a kind of hydrochloric acid treated coal ash according to claim 1 is prepared the method for aluminum oxide, it is characterized in that described activation is a kind of of mechanical activation or thermal activation.
3. a kind of hydrochloric acid treated coal ash according to claim 1 is prepared the method for aluminum oxide, it is characterized in that described mechanical activation adopts a kind of in vibration mill, vertical mill, planetary mills or high-energy ball milling.
4. a kind of hydrochloric acid treated coal ash according to claim 1 is prepared the method for aluminum oxide, it is characterized in that described thermal activation is that flyash is heated to 230 ℃ ~ 800 ℃.
5. a kind of hydrochloric acid treated coal ash according to claim 1 is prepared the method for aluminum oxide, it is characterized in that described heat exchanger is a kind of in direct heat exchanger or indirect heat exchanger.
6. a kind of hydrochloric acid treated coal ash according to claim 5 is prepared the method for aluminum oxide, it is characterized in that described indirect heat exchanger adds a kind of as thermal source in thermal recovery saturation steam, superheated vapour, thermal oil or fused salt.
7. a kind of hydrochloric acid treated coal ash according to claim 5 is prepared the method for aluminum oxide, it is characterized in that described direct heat exchanger adds a kind of as thermal source in thermal recovery saturation steam or superheated vapour.
8. a kind of hydrochloric acid treated coal ash according to claim 1 is prepared the method for aluminum oxide, and the liner that it is characterized in that described reactor is a kind of in acid-proof ceramic tile, enamel, glass, fluoroplastics or tetrafluoroethylene.
9. a kind of hydrochloric acid treated coal ash according to claim 1 is prepared the method for aluminum oxide, and the solid-liquid separation that it is characterized in that liquor alumini chloridi and slag in step 4 adopts a kind of in flocculating settling, pressure filtration or vacuum filtration.
10. a kind of hydrochloric acid treated coal ash according to claim 1 is prepared the method for aluminum oxide, it is characterized in that the one or more combination that described liquor alumini chloridi evaporative crystallization adopts multiple-effect falling film evaporation, forced circulation evaporation crystallization, drum dried or sprays in being dried.
11. a kind of hydrochloric acid treated coal ashs according to claim 1 are prepared the method for aluminum oxide, it is characterized in that described crystal aluminum chloride decomposition temperature is 400 ℃ ~ 800 ℃, obtain thick γ-Al
2o
3and hydrogen chloride gas.
12. a kind of hydrochloric acid treated coal ashs according to claim 11 are prepared the method for aluminum oxide, it is characterized in that hydrogen chloride gas to be dried, and adopt a kind of of the dry or molecular sieve drying of the vitriol oil.
13. a kind of hydrochloric acid treated coal ashs according to claim 1 are prepared the method for aluminum oxide, and the bayer process described in it is characterized in that is processed thick γ-Al
2o
3prepare metallurgical-grade aluminum oxide process and comprise raw pulp allotment, low temperature stripping, high scum separating, washing, essence filter, seminal fluid cooling, seed decomposition, seed preparation, aluminium hydroxide separating, washing, Aluminium hydroxide roasting, aluminum oxide packing and accumulating and mother liquid evaporation operation.
14. a kind of hydrochloric acid treated coal ashs according to claim 1 are prepared the method for aluminum oxide, it is characterized in that described high white residue is used for preparing high silicon filler, white carbon black, silica gel or water glass.
15. a kind of hydrochloric acid treated coal ashs according to claim 12 are prepared the method for aluminum oxide, it is characterized in that dry hydrogen chloride gas delivers in reactor.
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Cited By (10)
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| CN103936045A (en) * | 2014-04-01 | 2014-07-23 | 孙琦 | Method for extracting aluminum oxide from coal ash |
| CN105712385A (en) * | 2016-04-14 | 2016-06-29 | 王嘉兴 | Preparation method of aluminum hydroxide |
| CN106745129A (en) * | 2016-11-22 | 2017-05-31 | 昆明理工大学 | The separation method of aluminium silicon in a kind of sial slag |
| CN106966415A (en) * | 2017-03-29 | 2017-07-21 | 西安航天动力试验技术研究所 | The process of aluminum oxide in a kind of acidity extraction coal-powder boiler flyash |
| CN106966416A (en) * | 2017-04-11 | 2017-07-21 | 中国神华能源股份有限公司 | A kind of method that high purity aluminium oxide is extracted from coal-powder boiler flyash |
| CN110272299A (en) * | 2018-03-15 | 2019-09-24 | 国家能源投资集团有限责任公司 | Coal ash for manufacturing for siliceous fertilizer method |
| CN110342554A (en) * | 2018-04-03 | 2019-10-18 | 国家能源投资集团有限责任公司 | The method of flyash extraction aluminum and coproducing lithium carbonate |
| CN111498884A (en) * | 2020-06-01 | 2020-08-07 | 江苏泰特联合环保科技有限公司 | Treatment process and device for fluorine-containing waste hydrochloric acid |
| CN113753929A (en) * | 2021-08-26 | 2021-12-07 | 王俊 | Method for preparing high-whiteness aluminum hydroxide and silicon fertilizer from high-alumina fly ash |
| CN114314622A (en) * | 2020-09-30 | 2022-04-12 | 中国科学院过程工程研究所 | Method for producing metallurgical-grade aluminum oxide by roasting-free and strengthened acid leaching coal gangue |
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