27 results about "Gibbsite" patented technology

The invention discloses a preparation device of pseudo-boehmite, which relates to the technical field of chemical equipment and comprises a reaction kettle, an electrode column, a grating and a stirring shaft. The invention also discloses a preparation method of the pseudo-boehmite preparation device. The preparation method comprises the following steps: material addition, colloid generation, aging, gibbsite conversion and repeated charging. The inner kettle and the outer kettle are arranged, a sodium aluminate solution and carbon dioxide are subjected to a neutralization reaction in the inner kettle to generate pseudo-boehmite colloid, part of gibbsite generated due to slow reduction of the pH value in the reaction process is precipitated at the bottom end of the inner kettle, and the pseudo-boehmite colloid can directly enter the outer kettle to be subjected to aging treatment after being generated; gibbsite can be heated at the bottom end of the inner-layer kettle to be converted into monohydrate gibbsite, and the monohydrate gibbsite can enter the outer-layer kettle along with subsequent pseudo-boehmite to be aged, so that the gibbsite can be directly converted and recycled in the preparation process of the pseudo-boehmite.

A thermostabilizing agent is used in the production of olefinic hydrocarbons. A carrier for a thermostabilizing agent is obtained by mixing a product of rapid partial dehydration of gibbsite having the formula Al2O3·nH2O, where 0.43≤n≤1.5, and calcium compounds, and forming, drying and sintering granules at a temperature of 900-1400°С. The carrier contains, in terms of oxides: 10-36 wt% calcium oxide, and the remainder aluminium oxide. The percentage of pores having an effective radius of 60-70 nm is 70-78%. The thermostabilizing agent has a specific surface area of 8.0-35.0 m2 / g and a crush strength of 15-33 MPa. The technical result is the creation of a thermostabilizing agent that has a high specific surface area, high thermal stability, a constant phase composition, and high strength.

The invention relates to the technical field of aluminum oxide clean production, in particular to a method for treating gibbsite through high-temperature calcification transformation based on source blocking, which comprises the following steps: mixing high-iron bauxite, a calcium compound and Bayer mother liquor, and then carrying out pulpifying to obtain ore pulp; conveying the ore pulp to a high-pressure dissolution reactor to obtain transformed red mud; separating and washing the transformed red mud by using a vortex rapid settling tank; and adding a binder into the washed and dried transformed red mud to prepare small balls, and roasting, hardening and solidifying to obtain ironmaking pellets. According to the method, Bayer process flow equipment can be directly adopted, the method has the characteristics of simple process and equipment, high production efficiency and the like, the transformed slag serves as a pellet raw material to be directly used for producing pellets, no solid waste is generated in the whole process, and finally harmless, high-valued and full-quantized consumption of the red mud is achieved; and the worldwide problem that a large amount of red mud is discharged in the aluminum oxide production process is thoroughly solved.

The invention relates to a treatment method for red mud dissolved out of gibbsite, the red mud dissolved out of gibbsite contains sodium-silicon slag and ferric oxide, the method comprises the following steps: under the condition of set temperature, mixing the red mud dissolved out of gibbsite with alkali liquor with set concentration and degassed carbide slag for chemical reaction, the red mud is dissolved out from the gibbsite to be converted into molten garnet, and dissolved-out slurry is obtained. According to the method, sodium oxide and aluminum oxide in the red mud dissolved out of gibbsite are effectively recycled.

The invention belongs to the technical field of alumina ceramic preparation, and particularly relates to microcrystalline wear-resistant alumina ceramic and a preparation method thereof. The microcrystal wear-resistant aluminum oxide ceramic is prepared from the following raw materials: fused corundum powder, gibbsite, diopside, calcium fluosilicate, neodymium oxide, nickel aluminate, strontium oxide and sodium tripolyphosphate. According to the microcrystal wear-resistant aluminum oxide ceramic disclosed by the invention, the fused corundum powder and the gibbsite are used as main raw materials, so that the mechanical property of the prepared aluminum oxide ceramic is fundamentally ensured; diopside and calcium fluosilicate are used as fluxing agents, so that the firing temperature of the aluminum oxide ceramic is reduced, and the compactness is improved; neodymium trioxide, nickel aluminate and strontium oxide are used as wear-resistant assistants, and the wear resistance of the aluminum oxide ceramic is improved by improving the microstructure of the aluminum oxide ceramic, avoiding stress concentration at a grain boundary and generating a second reinforcement phase under the synergistic effect of the three assistants. Therefore, it is ensured that the prepared aluminum oxide ceramic has excellent wear resistance.

The application discloses a pseudo-boehmite preparation device and relates to the technical field of chemical equipment. The device comprises a reaction kettle, an electrode column, a grid and a stirring shaft. The application further discloses a preparation method of the pseudo-boehmite preparation device, which comprises the following steps: material adding, colloid generating, aging, gibbsite converting and repeated material adding. The sodium aluminate solution and carbon dioxide are neutralized in the inner layer kettle to generate pseudo-boehmite colloid. Part of the gibbsite generated due to the slow decrease of pH value is precipitated at the bottom end of the inner layer kettle during the reaction process. The pseudo-boehmite colloid can directly enter the outer layer kettle for aging treatment after being generated. The gibbsite can be heated at the bottom end of the inner layer kettle to be converted into bayerite. The bayerite can enter the outer layer kettle for aging with the subsequent pseudo-boehmite, so that the gibbsite can be directly converted and recovered in the pseudo-boehmite preparation process.

The utility model discloses a gibbsite flash-evaporation-free dissolution system which comprises a heat exchanger A1, a cold source outlet of the heat exchanger A1 is connected with a cold source inlet of a heat exchanger B2 through a pipeline, a cold source outlet of the heat exchanger B2 is connected with a cold source inlet of a heat exchanger C3 through a pipeline, and a cold source outlet of the heat exchanger C3 is connected with an inlet of a heat preservation staying system through a pipeline. An outlet of the heat preservation staying system is connected with a heat source inlet of the heat exchanger A1 through a pipeline, and heat source inlets of the heat exchanger B2 and the heat exchanger C3 are further connected with a heat source. According to the flash-free system disclosed by the utility model, a multi-stage flash evaporator, a secondary steam condensate water tank, a water cooler, a matched vacuum system and the like as well as related pipelines and accessories for connecting the equipment and the system are omitted, so that the power consumption of the equipment and the corresponding investment and operation and maintenance cost are reduced, and meanwhile, the heat dissipation loss of the system caused by the links is also eliminated. Therefore, the energy utilization efficiency is improved, the consumption of fresh steam is reduced, and the economic benefits and environmental protection benefits of the whole dissolution process are improved to a certain extent.

The application relates to a gibbsite-type bauxite processing method and belongs to the technical field of mineral processing, which comprises the following steps: crushing and grading gibbsite-type bauxite to obtain coarse-grained material and fine-grained material; removing impurities from the coarse-grained material by gravity separation to obtain gravity separation concentrate and gravity separation tailings; removing impurities from the fine-grained material by centrifugal mineral separation to obtain centrifugal concentrate and centrifugal tailings; wherein the separation density of the gravity separation is 1.7-3.0 g / cm 3 ; the separation density of the centrifugal mineral separation is 1.7-3.2 g / cm 3 ; the aluminum concentrate with high alumina content, high aluminum-silicon ratio and relatively low impurity content is obtained, the tailings with high silicon dioxide content, iron content and titanium content are obtained, the method has the characteristics of short mineral separation process, low mineral separation cost, low investment, high mineral separation efficiency, the concentrate is suitable for producing alumina by the Bayer method, and the tailings are applied to the building material industry.

The invention provides short-process high-decomposition-rate coarse-grained low-alkali aluminum hydroxide and a preparation method thereof, and relates to the technical field of sodium aluminate solution seed precipitation. The method specifically comprises the following steps: taking a small amount of circulating seed crystals and activating through a high-temperature refined sodium aluminate solution to obtain active seed crystals 1; adding an additive into the sodium aluminate solution to prepare an active seed crystal 2; the method comprises the following steps: adding an active seed crystal 1 and an active seed crystal 2 into a refined sodium aluminate solution for seed precipitation, then adding a large amount of circulating seed crystals for seed precipitation, regulating aluminate ions in the solution and selectively nucleating on the gibbsite crystal face through a specific seed precipitation temperature system and a stirring system, and strengthening particle agglomeration and growth, thereby obtaining the gibbsite crystal face nucleation-enhanced aluminum oxide crystal face nucleation-enhanced aluminum oxide crystal face nucleation-enhanced aluminum oxide crystal face nucleation-enhanced aluminum oxide crystal face nucleation-enhanced aluminum oxide crystal face. Gibbsite with large particle size and low alkali content is prepared under high decomposition rate, the decomposition rate is greater than 56%, and the alkali content of the product is (Na2O) lt; 0.16%, d50gt; and 60 [mu] m. The method has the advantages of short flow, high decomposition rate, low alkali content of the product, sand formation, and facilitation of stabilization of aluminum electrolyte components and promotion of the development of the fine alumina industry.

The invention relates to the technical field of preparation of water-permeable bricks, in particular to a heavy metal / saline-alkali retardation slow-release fertilizer solid waste water-permeable brick for arbor planting pits and a preparation method of the water-permeable brick. The composite brick comprises the following components in parts by mass: 20-30 parts of spherical-fibrous composite unit bodies, 50-60 parts of a high-calcium-sulfur-aluminum system multiphase composite brick body binder, 5-8 parts of zeolite powder, 5-10 parts of calcium bentonite, 3-5 parts of a gibbsite-biochar composite material and 40-45 parts of water. The soil conditioner has the effects of salt ion adsorption, heavy metal retardation and alkali neutralization, and the soil aggregate structure is improved through cooperation of the biochar and humic acid substances. The strong dependence of a traditional salt-tolerant arbor planting technology on original soil conditions is broken through. Cold-resistant, drought-resistant, alkali-resistant and stain-resistant arbors are planted in the polluted land of the mining area, so that soil can be stabilized, water and soil loss is prevented, and pollution diffusion is reduced. And meanwhile, vegetation coverage inhibits flying dust, purifies air, beautifies the environment and reconstructs ecology, low-cost restoration and potential economic benefits are achieved, and sustainable treatment and ecological restoration of the mining area are assisted.

The invention relates to the technical field of refractory materials, in particular to a method for calcining high-alumina clinker in one step by utilizing a gibbsite homogenized material, which comprises the following steps: carrying out raw material pre-homogenization, crushing, screening and grinding on a gibbsite raw material subjected to coarse crushing by using a dust collection system matched with each process, and carrying out ball pressing on the powder and dust collection ash in a high-pressure forming process, the pellets enter a thermotechnical kiln through a feeding system to be calcined, and high-aluminum clinker obtained through calcination is cooled and then enters subsequent finished product transportation, finished product processing and finished product storage. The method has the beneficial effects that the high-alumina clinker product with high volume density can be effectively prepared, the method has the characteristics of simple process and low energy consumption, and the raw material utilization rate and the environmental protection requirement can be considered.

The invention discloses a method for producing aluminum oxide by extracting iron from high-iron gibbsite, which comprises the following steps: S10, carrying out crushing treatment on pre-homogenized high-iron gibbsite to obtain high-iron gibbsite crushed ore; s20, the high-iron bauxite trihydrate crushed ore is subjected to high-pressure roller milling, and high-iron raw ore powder is obtained; s30, the high-iron raw ore powder is converted into magnetic high-iron clinker ore powder through suspension magnetization roasting; s40, the magnetic high-iron clinker ore powder is subjected to aluminum-iron separation through a dry magnetic separator, and high-aluminum low-iron clinker ore powder and high-iron low-aluminum clinker ore powder are obtained through separation; s50, the high-aluminum low-iron clinker mineral powder is fed into a Bayer process system for aluminum oxide production; and S60, the high-iron low-aluminum clinker ore powder is prepared into refined iron ore powder. According to the method, after the high-iron gibbsite is subjected to dry-method pulverizing, magnetizing roasting and aluminum-iron separation, comprehensive utilization of powdery weak-magnetism iron ore materials is achieved; the process is high in operation rate and stable in product quality, and can be perfectly linked with upstream and downstream selection and ironmaking sections.

The utility model relates to the technical field of filters, and provides an anti-blocking filter which comprises a filter cartridge, a circular groove is formed in the center of the inner wall of the filter cartridge, a discharge port is formed in the center of the bottom of the filter cartridge and communicated with the circular groove, a screen is arranged on one side of the discharge port, fixing rods are connected to the four corners of the screen in a screwed mode, and the fixing rods are connected with the filter cartridge in a screwed mode. The other ends of the fixing rods are screwed and fixed with the inner wall of the filter cartridge, a bracket is welded among the four fixing rods, and the center of the bracket is screwed with a speed reducing motor; according to the anti-blocking filter, gibbsite crystals in alkaline liquid can be filtered out through the screen, the speed reducing motor drives the scraper to rotate, the gibbsite crystals filtered out through the screen can be pushed to the discharging opening, the cleaning effect is achieved, meanwhile, the arc-shaped scraper structure is matched with the circular groove, and the cleaning effect is improved. The crystals can be better guided to move to the discharging opening, the supporting and fixing effect on the gear motor can be improved through the X-shaped support, and the stability of the filter cartridge is improved.

The present application belongs to the technical field of nonferrous metallurgy, and particularly relates to a method for strengthening bayer process dissolution of high-iron gibbsite-type bauxite by a reducing agent. The method comprises the following steps: (1) preparing a mixed ore slurry by mixing high-iron gibbsite-type bauxite, sodium aluminate circulating mother liquor and an organic acid reducing agent containing an alpha-hydroxy acid structure; (2) heating the mixed ore slurry to 210-250 DEG C to perform a dissolution reaction, obtaining a dissolution slurry and a dissolution residue, and washing the dissolution residue with hot water to obtain an iron concentrate. The method can realize conversion of aluminum goethite at a lower temperature in the bayer process dissolution process, improve the dissolution rate of aluminum, directly produce red mud with high iron grade and low aluminum content for iron resource recovery, shorten the process flow and reduce the process energy consumption.

The application discloses a high-strength firebrick and a preparation method thereof. The preparation method of the high-strength firebrick is as follows: first, spinel powder, active alumina, silicon powder, sillimanite, fly ash, gibbsite, aluminum phosphate-spinel ceramic ball, zirconium-cerium doped silicon carbide / boron nitride fiber and potassium feldspar are uniformly mixed to obtain a mixture; the mixture is uniformly mixed with water to obtain a slurry; the slurry is pressed into a brick blank, dried, calcined and cooled to obtain the high-strength firebrick. The obtained firebrick has rich pore structure and excellent mechanical properties, and has a wide application prospect.

The invention belongs to the technical field of inorganic material preparation, and discloses a method for preparing porous alumina. The method comprises the following steps: mixing gibbsite serving as a raw material with an organic solvent, then carrying out high-temperature solvothermal reaction, and carrying out filtering, drying and high-temperature calcination on the obtained product to obtain porous alumina with different structures, including sponge-like pores, slit pores, accumulation pores and the like. Different from most pore-forming technologies at present, the preparation method has the advantages that an intermediate product does not need to be treated and additional materials such as a pore-forming agent do not need to be added in the preparation process, the cost is low, the operation steps are simple and convenient, and other impurities are not introduced in the preparation process.

A process for preparing crystalline boehmite includes combining a stoichiometric amount of flash calcined gibbsite (AI2O3) and gibbsite (Al(OH)3) in a pressurizable reaction vessel; heating the flash calcined gibbsite and gibbsite in the reaction vessel to a temperature of about 200° C. to about 280° C. and for a time sufficient to form crystalline boehmite. A crystalline boehmite exhibiting a crystallite from about 600 Å to about 850 Å when measured in the 120 direction of the crystallographic space group Cmcm.

The present invention relates to the technical field of the preparation of permeable bricks, and specifically relates to a heavy metal / saline-alkali retardation and slow-release fertilizer solid waste permeable brick for arbor planting soil pits and a preparation method thereof. The components thereof by mass parts include: 20-30 parts of a spherical-fibrous composite unit body, 50-60 parts of a high-calcium sulphoaluminate system multiphase composite brick body binder, 5-8 parts of zeolite powder, 5-10 parts of calcium-based bentonite, 3-5 parts of a gibbsite-biochar composite material, and 40-45 parts of water. The present invention has the functions of adsorbing salt ions, retarding heavy metals and neutralizing alkali, and the biochar cooperates with humic acid substances to improve the soil aggregate structure. It breaks through the strong dependence of traditional salt-tolerant arbor planting technology on the original soil conditions. When planting cold-resistant, drought-resistant, alkali-resistant and pollution-resistant arbors in polluted mining areas, it can stabilize the soil, prevent soil erosion and reduce the spread of pollution. At the same time, the vegetation coverage can inhibit dust, purify the air, beautify the environment and reconstruct the ecosystem, and has both low-cost restoration and potential economic benefits, helping the sustainable treatment and ecological restoration of mining areas.

This application relates to a bauxite flotation iron removal collector, its preparation method, and its application. The collector's molecular structure incorporates both phosphonic acid groups and tertiary amine groups. During flotation, the phosphonate groups dissociate to form phosphonate ions, which then bond with Al atoms on the surface of gibbsite via their own phosphorus-oxygen double bonds. 3+ Formation of chelates enhances adsorption stability; simultaneously, it affects Al 3+ It exhibits excellent selectivity; the tertiary amine group gives the collector an isomerically charged distribution, blocking electrostatic attraction with negatively charged hematite and enhancing ion selectivity; the terminal carbon chain hydroxyl group of the tertiary amine group improves the collector's solubility and dispersibility at room temperature; this collector, by introducing phosphonic acid groups and tertiary amine groups into the carbonyl group, has a mild process and low industrialization cost. When applied to high-iron gibbsite bauxite, this collector can simultaneously achieve technical advantages such as high selectivity, low reagent consumption, resistance to low-temperature conditions, and excellent foam stability.

The invention relates to the technical field of organic matter removal, and provides a gibbsite organic matter roasting removal process which comprises the following steps: step 1, mixing foreign gibbsite and domestic diasporic bauxite according to a certain mass ratio; step 2, preparing mineral powder from the mixed ore in final grinding equipment by adopting a dry-method powder preparation process; 3, roasting treatment is conducted in a desulfurization furnace, and the temperature and the retention time of a main furnace reaction area are controlled; and 4, synchronously removing organic matters and inorganic carbon through high-temperature roasting. A nano ceramic anti-sticking coating with a certain thickness is adopted for a discharging port of the final grinding equipment, and the inclination angle of the mineral powder conveying equipment is optimized. The roasting desulfurization process is adopted. A nano ceramic anti-sticking coating with a certain thickness is used on a final grinding device, the inclination angle of a belt mineral powder conveying device is optimized, and a wear-resistant ceramic lining plate is used, so that the productivity is improved; dry-method powder preparation and roasting desulfurization equipment is used; organic matters and inorganic carbon are removed through high-temperature roasting, so that the salt discharge load is reduced by 30%, and the adaptability of mineral types is improved.

The invention discloses a high-strength refractory brick and a preparation method thereof. A preparation method of a high-strength refractory brick comprises the following specific steps: firstly, uniformly mixing spinel powder, activated aluminum oxide, silica powder, sillimanite, fly ash, gibbsite, aluminum phosphate-spinel ceramic balls, zirconium-cerium doped silicon carbide / boron nitride fibers and potassium feldspar in parts by weight to obtain a mixture; uniformly mixing the mixture with water to obtain slurry; and pressing the slurry into a green brick, drying, calcining and cooling to obtain the high-strength refractory brick. The obtained refractory brick is rich in pore structure, excellent in mechanical property and wide in application prospect.

The invention relates to a nanometer lignin-based direct flotation desilicication collecting agent and a preparation method and application thereof, and belongs to the technical field of mineral flotation. The novel collecting agent with excellent selectivity and efficient collecting capacity is successfully prepared by loading high-selectivity carboxyl / hydroximic acid functional groups on the surfaces of nano lignin particles in a chemical grafting manner and assisting with a stable and controllable synthesis process. The collecting agent can accurately capture diaspore through selective chemical adsorption of functional groups in the low-grade bauxite direct flotation desilicication operation, diaspore is effectively floated out through the hydrophobic effect of the nano-carrier, meanwhile, entrainment of silicon-containing gangue minerals is reduced, and therefore the aluminum-silicon separation efficiency is remarkably improved, and the collecting agent has the advantages of being simple in process, low in cost and good in application prospect in the direct flotation desilicication operation of the low-grade bauxite. The problems that in the prior art, selectivity is poor, and adaptability to micro-fine ore is poor are effectively solved.

The invention belongs to the technical field of rotary kilns, and particularly relates to a high-temperature rotary kiln for calcining gibbsite, which is characterized in that the diameter of a rotary kiln cylinder is 3.8-4.5 m, the length of the kiln is 105-120 m, and the inclination is 35: 1000; the transmission device is a bilaterally symmetrical dual-driving mechanism, each group of driving mechanism is meshed with the gear ring through a gear, and the rotating speed of the rotary kiln barrel is 1.2-1.5 r / min; and the gear and the gear ring form a helical gear pair. The rotary kiln has the beneficial effects that (1) the stability of the rotary kiln barrel in the rotating process can be guaranteed through the double-thrust bearing; the double-catch-wheel device can prevent the barrel from moving downwards along the axis, and the equipment safety is good; the heat transfer efficiency can be improved through the material raising section, meanwhile, the effect of partially crushing the raw materials is achieved, calcination of the follow-up high-temperature section can be improved, the perfect sintering effect is achieved, high-quality high-aluminum clinker is obtained, and the requirement for processing the high-quality gibbsite raw materials is fully met.

The invention relates to the technical field of screening and separation of bauxite, in particular to a separation method of gibbsite bauxite with high silicon content. The separation method comprises the following steps: performing primary grading treatment on gibbsite bauxite to obtain coarse-fraction raw ore and fine-fraction raw ore; carrying out photoelectric separation pretreatment on the coarse-fraction raw ore to obtain pre-selected concentrate and pre-selected tailings; the pre-selected tailings are crushed, pre-selected tailing crushed objects and the fine-fraction raw ore are sequentially combined and subjected to secondary grading treatment, and coarse-fraction treated ore and fine-fraction treated ore are obtained; the coarse-fraction treated ore is subjected to first separation, and coarse-fraction concentrate is obtained; the fine-fraction treated ore is subjected to secondary separation, and fine-fraction concentrate is obtained; the pre-selected concentrate, the coarse-fraction concentrate and the fine-fraction concentrate are combined, and aluminum concentrate is obtained; and the coarse-fraction tailings are combined, and separated tailings are obtained. The separation method can obviously improve the grade of the aluminum concentrate.

The invention discloses an efficient flotation method for medium-low-grade and co-associated hard-to-utilize bauxite. The efficient flotation method is characterized by comprising the following steps: (1) selecting medium-low-grade co-associated bauxite; (2) crushing the selected bauxite through a crusher; (3) grinding the crushed bauxite through an autogenous mill and a ball mill, checking and screening; (4) mixing and grading the slurry subjected to ore grinding treatment; (5) adding a flotation reagent into the qualified slurry, carrying out flotation through a flotation machine, and carrying out flotation separation to obtain concentrate slurry after the flotation reagent is added; according to the method, bauxite resources are fully and reasonably recycled to the maximum extent, and diaspore, gibbsite, boehmite and soil in the accumulated bauxite are mainly mixed together. In terms of 70% recovery, the ore with the fine fraction smaller than 1 mm can be recovered through flotation, so that the industrial index of the accumulated bauxite and the content of beneficial minerals in the fine fraction slime with the fine fraction smaller than 1 mm of the mud-containing bauxite are comprehensively considered, the boundary ore content can be at least reduced to be below 100 kg / m < 3 >, and the resource reserve of the accumulated bauxite in Guangxi province can be reduced to be below 100 kg / m < 3 >. The number can be multiplied without inputting a large number of exploration projects; the method provided by the invention can reduce the tailing discharge amount, thereby occupying less cultivated land and reducing the tailing discharge cost, can improve the A / S of the wash concentrate, and has obvious economic benefits for improving the productivity, alkali consumption and other indexes of alumina factories.

The invention relates to the technical field of mesoporous alumina materials, and innovatively provides a novel raw material path, i.e., synthesis of an alumina precursor from gibbsite and preparation of high-performance mesoporous alumina through a pyrolysis process: gibbsite is used as an aluminum source, and amorphous alumina is prepared through activation roasting under specific conditions; a precursor is generated through a liquid phase reaction, and the mesoporous alumina material is obtained after roasting. A unique path for converting gibbsite into basic ammonium aluminum carbonate through an activation step is disclosed and reported for the first time. The production cost is greatly reduced by adopting the gibbsite, the synthesis process is pollution-free, and the repeated cyclic utilization of the filtrate is realized. The method ingeniously breaks through the limitation of poor pore structure of the gibbsite, the gibbsite is successfully converted into the mesoporous material with an excellent pore structure, and the specific expression is that the original pore volume of the gibbsite is 0.07 cm < 3 > / g, the aluminum oxide with the pore volume of 0.62 cm < 3 > / g is obtained after conversion, and a new research direction and industrial application prospects are developed for the field of mesoporous aluminum oxide.

The invention discloses a gibbsite flash evaporation-free dissolving-out method which comprises the following steps: pre-desiliconized ore pulp at 92-95 DEG C enters a heat exchanger A, in the heat exchanger A, high-temperature dissolved-out slurry and the pre-desiliconized ore pulp are subjected to heat exchange, so that the temperature of the pre-desiliconized ore pulp is gradually increased to 110-115 DEG C, then the pre-desiliconized ore pulp enters a heat exchanger B, in the heat exchanger B, through new steam condensate water, the temperature of the pre-desiliconized ore pulp is increased to 110-115 DEG C; the pre-desiliconized ore pulp is continuously heated, the temperature of the pre-desiliconized ore pulp is increased to about 120 DEG C, then the pre-desiliconized ore pulp enters a heat exchanger C, in the heat exchanger C, the pre-desiliconized ore pulp is further heated through new steam till the temperature of the pre-desiliconized ore pulp reaches the dissolution temperature of 155-160 DEG C, then the pre-desiliconized ore pulp enters a heat preservation staying system to stay for 30-60 min, and a dissolution reaction is conducted; the slurry subjected to heat preservation dissolution enters a heat exchanger A to be subjected to liquid-liquid phase-free heat exchange, and the temperature of the slurry subjected to heat exchange is reduced to 109 DEG C or below. The method simplifies the process flow, saves the investment and land occupation, and improves the economic benefit of alumina production.