CN105314661A - Comprehensive utilization method for high-iron bauxite - Google Patents
Comprehensive utilization method for high-iron bauxite Download PDFInfo
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- CN105314661A CN105314661A CN201410372083.7A CN201410372083A CN105314661A CN 105314661 A CN105314661 A CN 105314661A CN 201410372083 A CN201410372083 A CN 201410372083A CN 105314661 A CN105314661 A CN 105314661A
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Abstract
The invention discloses a comprehensive utilization method for high-iron bauxite and relates to the technical field of nonferrous metallurgy and ferrous metallurgy, particularly a comprehensive utilization method for producing iron and aluminum from iron and aluminum paragenic ores. The method disclosed by the invention can effectively treat bauxitic ores, wherein the iron grade is 15-30% and the aluminum grade is 30-65%. The invention provides the comprehensive utilization method for high-iron bauxite, wherein the method is wide in application range, efficient and environmental-friendly. The method comprises the following steps of: S1, drying, crushing and grinding high-iron bauxitic ores; S2, dissolving the bauxitic ores, S3, carrying out desilicication and then pumping the ores into a separating subside to be settled and separated to obtain a dissolved liquid and red mud; S4, preparing aluminum oxide; S5, feeding aired red mud into a proportioning bin, mixing the red mud with coal and iron powder, pre-reducing the mixture by high-temperature coal gas in a rotary kiln, and then adding coal powder and lime in an electric furnace for melting and reduction; and S6, magnetically screening, sieving and grinding electronic furnace slag to prepare mud blanks, and firing the mud blanks into brick bodies in the kiln.
Description
Technical field
The present invention relates to Non-ferrous Metallurgy and technical field of ferrous metallurgy, particularly relate to a kind of method of comprehensive utilization of producing iron and aluminium from iron aluminium mineral intergrowth.The method effectively can process Iron grade in 15%-30%, aluminium grade at the bauxitic ore of 30%-65%.
Background technology
China's bauxite resource enriches, but high-grade gibbsitic bauxite is less, mostly is diaspore type bauxite and symbiosis bauxite.But along with the development of China, the demand of aluminium is multiplied, and facilitates the development of aluminium industrial chain.Through exploitation for many years, simple bauxite resource is fewer and feweri, causes the many Alumina Enterprises of China to have to high price from external import bauxite to continue production.In the face of the rate of growth that aluminum i ndustry is so fast, and China's bauxite resource shortage obviously, and the contradiction between resource and demand is placed in front of us.
In fact high-iron bauxite refers to that all iron content is more than 25%, simultaneously containing iron-bearing minerals such as rhombohedral iron ore, magnetite, rhombohedral iron ore, limonites, with the general designation of the aluminum-containing mineral ores such as gibbsite, boehmite or diaspore.More concentrated in the distribution of China, be mainly distributed in the provinces such as Shanxi, Henan, Guizhou and Guangxi.China's high-iron bauxite reserves are very large, but the method for this type of bauxite of process mostly is alkaline process at present, can only aluminium in single recovery ore, and in ore, other valuable constituents become waste residue, and the rate of recovery of aluminium is low.Therefore, adopt advanced alumina producing technology, develop new bauxite resource, the available resources scope expanding aluminum ore is one of China's aluminum oxide industry effective way realizing Sustainable development.
The method of Chinese invention patent application number a kind of ore concentration of bauxite that has been the disclosure of the invention of 201310701746.0, the method comprises carries out ore grinding, floatation desulphurization process to ore, it is characterized in that: its treating processes is that ore is carried out ore grinding, sedimentation and filtration, bauxite stripping and floatation desulphurization; Described ore carries out ore grinding and synchronously washes.Its deficiency existed is: ore dressing effect is undesirable.Flow process is complicated, and required main equipment is many, costly.
The method of Chinese invention patent application number a kind of comprehensive treating process bauxite that has been the disclosure of the invention of 201210599324.2, it is characterized in that, bauxite is ground under the condition using circulation chelate solution, heat the suspension extraction iron obtained and form iron chelate and a small amount of aluminum chelate, suspension is separated into the higher-grade bauxite eliminating spathic iron ore after extraction iron and the solid phase that can be processed into alumina according to currently known methods and the liquid phase making it decompose by the pH value of twice change solution, circulation sodium bicarbonate is used to be neutralized to pH value for 7-8, again extract aluminum precipitation and go out dawsonite throw out, it is separated from solution, again extract iron be greater than the condition of 12 in the pH value of solution under and be settled out ironic hydroxide, be separated as commercial grade essence iron ore, evaporation concentration represents the liquid phase of inner complex mother liquor, make it cool down, gaseous carbon dioxide is used to make its carbonating under stress, crystallization sodium bicarbonate, then be separated from chelate solution, described chelate solution and sodium bicarbonate are circulation products.Its deficiency existed is: the required condition of reaction is harsh, really cannot be applied to actual production.And production process is loaded down with trivial details, lose larger in each operation at actual production process aluminium.
Summary of the invention
The present invention is exactly for the problems referred to above, makes up the deficiencies in the prior art, provides a kind of method of comprehensive utilization of high-iron bauxite of applied widely, efficient, environmental protection.
For realizing above-mentioned purpose of the present invention, the present invention adopts following technical scheme.
The present invention includes following steps:
Step one: high-iron bauxite stone, wherein the content of aluminium be 30%-55%, iron content at 15%-30%, drying, fragmentation, be finely ground to 60 orders.
Step 2: in the high-iron bauxite stone flour after step one processes, add the lime of 20%-30%, with circulating mother liquor (severe alkali concn is at the 200g/l-260g/l) stripping under the condition of 260 DEG C-300 DEG C in aluminum oxide production process, dissolution time is 60min-120min.
Step 3: dissolved mineral slurry is through dilution, and atmospheric silicon removing in groove, desiliconization time 4-8 hour, is pumped into separation tank afterwards and carries out settlement separate, obtain dissolution fluid and red mud.
Step 4: add aluminium hydroxide crystal seed in dissolution fluid, obtains aluminium hydroxide and circulating mother liquor, and circulating mother liquor can be used for the process in leaching of step 2; Aluminium hydroxide through the high-temperature roasting of about 1000 DEG C, removes moisture in rotary kiln, and transforming crystalline becomes aluminum oxide.
Step 5: red mud is dried rear feeding batch bin, mix with coal and iron powder, red mud: coal: iron powder=9:10:5, prereduction is carried out with coal gas of high temperature (temperature is 900-1050 DEG C) in rotary kiln, then in electric furnace, add coal dust and lime carry out molten point of reduction, obtain molten iron, tail gas and slag, tail gas can be used as prereduction coal gas after treatment, also can be used in Aluminium hydroxide roasting operation.
Step 6: by electric-furnace slag after magnetic separation, screening, fine grinding, makes moulded pottery not yet put in a kiln to bake burnt brick body in kiln; The vitrified brick body made is put into the mixed solution of sodium silicate solution and barium sulfate; In 200 DEG C of dryers, dry 15min, the brick surface obtained can cover one deck barium sulfate protective membrane, shields its radioactivity; Sodium silicate solution is commonly called as water glass, barium sulfate is made the powdery that granularity is 200-400, by weight, obtains mixed solution after fully being mixed by 10-30 part barium sulfate with 70-90 part sodium silicate solution; Slag directly can prepare vitrified brick, prepares vitrified brick again after also can adding construction waste.
Compared with prior art beneficial effect of the present invention.
(1) applied widely: to adopt the method for comprehensive utilization of high-iron bauxite of the present invention can maximally utilise efficient resource in iron aluminium mineral intergrowth.May be used for the existing most of high-iron bauxite of process China.
(2) efficient: to reduce red mud alkalinity by adding superfluous lime, improving red-mud settlement performance.High temperature stripping is conducive to Reaction time shorten and improves solubility rate.
(3) environmental protection: be separated the low alkali red mud that obtains and be applicable to reduce iron processed completely, and circulating mother liquor and coal gas can recycles in whole operation, the slag of last electric furnace institute output can be made into brick.Whole technical process can accomplish emission-free, without waste residue.
Accompanying drawing explanation
Fig. 1 is the production scheme of high-iron bauxite of the present invention.
Fig. 2 is the preparation flow figure of the vitrified brick utilized.
Embodiment
Choose the high-iron bauxite of three kinds of different grades, use the inventive method process respectively.
Embodiment 1: Guangxi high-iron bauxite is tested by the inventive method, Al in these mineral
2o
3content is 63.55%, SiO
2content is 12.88%, and alumina silica ratio is 4.93, Fe
2o
3content is 15.83%.
Step one: by above-mentioned high-iron bauxite stone, drying, fragmentation, is finely ground to 60 orders.
Step 2: in the high-iron bauxite stone flour after step one processes, add the CaO of 20% in ore, with the stripping at 260 DEG C of temperature of industrial circulating mother liquor, dissolution time is 90min, obtains Al
2o
3solubility rate is 87.86%, and red mud alkalinity is 0.98%.
Step 3: dissolved mineral slurry is through dilution, and atmospheric silicon removing in groove, desiliconization time 4 hours, is pumped into separation tank afterwards and carries out settlement separate, obtain dissolution fluid and red mud.
Step 4: add aluminium hydroxide crystal seed in dissolution fluid, obtains aluminium hydroxide and circulating mother liquor, and circulating mother liquor can be used for the process in leaching of step 2; Aluminium hydroxide through the high-temperature roasting of about 1000 DEG C, removes moisture in rotary kiln, and transforming crystalline becomes aluminum oxide.
Step 5: red mud is dried rear feeding batch bin, mix with coal and iron powder, red mud: coal: iron powder=9:10:5, prereduction is carried out with coal gas of high temperature (temperature is 1050 DEG C) in rotary kiln, then in electric furnace, add coal dust and lime carry out molten point of reduction, obtain molten iron, tail gas and slag, tail gas can be used as prereduction coal gas after treatment, also can be used in Aluminium hydroxide roasting operation.
Step 6: by electric-furnace slag after magnetic separation, screening, fine grinding, makes moulded pottery not yet put in a kiln to bake burnt brick body in kiln; The vitrified brick body made is put into the mixed solution of sodium silicate solution and barium sulfate; In 200 DEG C of dryers, dry 15min, the brick surface obtained can cover one deck barium sulfate protective membrane, shields its radioactivity; Sodium silicate solution is commonly called as water glass, barium sulfate is made the powdery that granularity is 200, by weight, obtains mixed solution, make brick body soak post-drying in mixed solution, obtain finished bricks with 80 parts of sodium silicate solutions after fully being mixed by 15 parts of barium sulfate.
Embodiment 2: Guizhou high-iron bauxite is tested by the inventive method, Al in these mineral
2o
3content is 50.33%, SiO
2content is 7.96%, and alumina silica ratio is 6.32, Fe
2o
3content is 25.77%.
Step one: by above-mentioned high-iron bauxite stone, drying, fragmentation, is finely ground to 60 orders.
Step 2: in the high-iron bauxite stone flour after step one processes, add the CaO of 25% in ore, with the stripping at 280 DEG C of temperature of industrial circulating mother liquor, dissolution time is 60min, obtains Al
2o
3solubility rate is 84.35%, and red mud alkalinity is 0.73%.
Step 3: dissolved mineral slurry is through dilution, and atmospheric silicon removing in groove, desiliconization time 8 hours, is pumped into separation tank afterwards and carries out settlement separate, obtain dissolution fluid and red mud.
Step 4: add aluminium hydroxide crystal seed in dissolution fluid, obtains aluminium hydroxide and circulating mother liquor, and circulating mother liquor can be used for the process in leaching of step 2; Aluminium hydroxide through the high-temperature roasting of about 1000 DEG C, removes moisture in rotary kiln, and transforming crystalline becomes aluminum oxide.
Step 5: red mud is dried rear feeding batch bin, mix with coal and iron powder, red mud: coal: iron powder=9:10:5, prereduction is carried out with coal gas of high temperature (temperature is 900 DEG C) in rotary kiln, then in electric furnace, add coal dust and lime carry out molten point of reduction, obtain molten iron, tail gas and slag, tail gas can be used as prereduction coal gas after treatment, also can be used in Aluminium hydroxide roasting operation.
Step 6: allocate 60 parts of building wastes and 0.05 part of fluoride salt mix and blend in electric-furnace slag after, make adobe by brick press, reburn and obtain brick body; Barium sulfate is made the powdery that granularity is 300, by weight, after fully being mixed with 70 parts of sodium silicate solutions by 25 parts of barium sulfate, obtain mixed solution; Make brick body soak post-drying in mixed solution, obtain finished bricks.
Embodiment 3: Henan high-iron bauxite is tested by the inventive method, Al in these mineral
2o
3content is 37.58%, SiO
2content is 6.34%, and alumina silica ratio is 5.93, Fe
2o
3content is 29.36%.
Step one: by above-mentioned high-iron bauxite stone, drying, fragmentation, is finely ground to 60 orders;
Step 2: in the high-iron bauxite stone flour after step one processes, add the CaO of 30% in ore, with the stripping at 300 DEG C of temperature of industrial circulating mother liquor, dissolution time is 120min, obtains Al
2o
3solubility rate is 81.66%, and red mud alkalinity is 0.53%.
Step 3: dissolved mineral slurry is through dilution, and atmospheric silicon removing in groove, desiliconization time 5 hours, is pumped into separation tank afterwards and carries out settlement separate, obtain dissolution fluid and red mud.
Step 4: add aluminium hydroxide crystal seed in dissolution fluid, obtains aluminium hydroxide and circulating mother liquor, and circulating mother liquor can be used for the process in leaching of step 2; Aluminium hydroxide through the high-temperature roasting of about 1000 DEG C, removes moisture in rotary kiln, and transforming crystalline becomes aluminum oxide.
Step 5: red mud is dried rear feeding batch bin, mix with coal and iron powder, red mud: coal: iron powder=9:10:5, prereduction is carried out with coal gas of high temperature (temperature is 1000 DEG C) in rotary kiln, then in electric furnace, add coal dust and lime carry out molten point of reduction, obtain molten iron, tail gas and slag, tail gas can be used as prereduction coal gas after treatment, also can be used in Aluminium hydroxide roasting operation.
Step 6: allocate 80 parts of building wastes and 0.3 part of fluoride salt mix and blend in electric-furnace slag after, make adobe by brick press, reburn and obtain brick body.Barium sulfate is made the powdery that granularity is 250, by weight, after fully being mixed with 70 parts of sodium silicate solutions by 30 parts of barium sulfate, obtain mixed solution.Make brick body soak post-drying in mixed solution, obtain finished bricks.
Claims (4)
1. a method of comprehensive utilization for high-iron bauxite, is characterized in that,
Step one: high-iron bauxite stone, wherein the content of aluminium be 30%-55%, iron content at 15%-30%, drying, fragmentation, be finely ground to 60 orders;
Step 2: in the high-iron bauxite stone flour after step one processes, add the lime of 20%-30%, with circulating mother liquor (severe alkali concn is at the 200g/l-260g/l) stripping under the condition of 260 DEG C-300 DEG C in aluminum oxide production process, dissolution time is 60min-120min;
Step 3: dissolved mineral slurry passes through dilution, atmospheric silicon removing in groove, and desiliconization time 4-8 hour, is pumped into separation tank afterwards and carries out settlement separate, obtain dissolution fluid and red mud;
Step 4: add aluminium hydroxide crystal seed in dissolution fluid, obtains aluminium hydroxide and circulating mother liquor, and circulating mother liquor can be used for the process in leaching of step 2; Aluminium hydroxide through the high-temperature roasting of about 1000 DEG C, removes moisture in rotary kiln, and transforming crystalline becomes aluminum oxide;
Step 5: red mud is dried rear feeding batch bin, mix with coal and iron powder, red mud: coal: iron powder=9:10:5, prereduction is carried out with coal gas of high temperature (temperature is 900-1050 DEG C) in rotary kiln, then in electric furnace, add coal dust and lime carry out molten point of reduction, obtain molten iron, tail gas and slag, tail gas can be used as prereduction coal gas after treatment, also can be used in Aluminium hydroxide roasting operation;
Step 6: by electric-furnace slag after magnetic separation, screening, fine grinding, makes moulded pottery not yet put in a kiln to bake burnt brick body in kiln; The vitrified brick body made is put into the mixed solution of sodium silicate solution and barium sulfate; In 200 DEG C of dryers, dry 15min, the brick surface obtained can cover one deck barium sulfate protective membrane, shields its radioactivity; Sodium silicate solution is commonly called as water glass, barium sulfate is made the powdery that granularity is 200-400, by weight, obtains mixed solution after fully being mixed by 10-30 part barium sulfate with 70-90 part sodium silicate solution; Slag directly can prepare vitrified brick, prepares vitrified brick again after also can adding construction waste.
2. the method for comprehensive utilization of high-iron bauxite as claimed in claim 1, is characterized in that: test Guangxi high-iron bauxite by the inventive method, Al in these mineral
2o
3content is 63.55%, SiO
2content is 12.88%, and alumina silica ratio is 4.93, Fe
2o
3content is 15.83%;
Step one: by above-mentioned high-iron bauxite stone, drying, fragmentation, is finely ground to 60 orders;
Step 2: in the high-iron bauxite stone flour after step one processes, add the CaO of 20% in ore, with the stripping at 260 DEG C of temperature of industrial circulating mother liquor, dissolution time is 90min, obtains Al
2o
3solubility rate is 87.86%, and red mud alkalinity is 0.98%;
Step 3: dissolved mineral slurry passes through dilution, atmospheric silicon removing in groove, and desiliconization time 4 hours, is pumped into separation tank afterwards and carries out settlement separate, obtain dissolution fluid and red mud;
Step 4: add aluminium hydroxide crystal seed in dissolution fluid, obtains aluminium hydroxide and circulating mother liquor, and circulating mother liquor can be used for the process in leaching of step 2; Aluminium hydroxide through the high-temperature roasting of about 1000 DEG C, removes moisture in rotary kiln, and transforming crystalline becomes aluminum oxide;
Step 5: red mud is dried rear feeding batch bin, mix with coal and iron powder, red mud: coal: iron powder=9:10:5, prereduction is carried out with coal gas of high temperature (temperature is 1050 DEG C) in rotary kiln, then in electric furnace, add coal dust and lime carry out molten point of reduction, obtain molten iron, tail gas and slag, tail gas can be used as prereduction coal gas after treatment, also can be used in Aluminium hydroxide roasting operation;
Step 6: by electric-furnace slag after magnetic separation, screening, fine grinding, makes moulded pottery not yet put in a kiln to bake burnt brick body in kiln; The vitrified brick body made is put into the mixed solution of sodium silicate solution and barium sulfate; In 200 DEG C of dryers, dry 15min, the brick surface obtained can cover one deck barium sulfate protective membrane, shields its radioactivity; Sodium silicate solution is commonly called as water glass, barium sulfate is made the powdery that granularity is 200, by weight, obtains mixed solution, make brick body soak post-drying in mixed solution, obtain finished bricks with 80 parts of sodium silicate solutions after fully being mixed by 15 parts of barium sulfate.
3. the method for comprehensive utilization of high-iron bauxite as claimed in claim 2, is characterized in that: test Guizhou high-iron bauxite by the inventive method, Al in these mineral
2o
3content is 50.33%, SiO
2content is 7.96%, and alumina silica ratio is 6.32, Fe
2o
3content is 25.77%;
Step one: by above-mentioned high-iron bauxite stone, drying, fragmentation, is finely ground to 60 orders;
Step 2: in the high-iron bauxite stone flour after step one processes, add the CaO of 25% in ore, with the stripping at 280 DEG C of temperature of industrial circulating mother liquor, dissolution time is 60min, obtains Al
2o
3solubility rate is 84.35%, and red mud alkalinity is 0.73%;
Step 3: dissolved mineral slurry passes through dilution, atmospheric silicon removing in groove, and desiliconization time 8 hours, is pumped into separation tank afterwards and carries out settlement separate, obtain dissolution fluid and red mud;
Step 4: add aluminium hydroxide crystal seed in dissolution fluid, obtains aluminium hydroxide and circulating mother liquor, and circulating mother liquor can be used for the process in leaching of step 2; Aluminium hydroxide through the high-temperature roasting of about 1000 DEG C, removes moisture in rotary kiln, and transforming crystalline becomes aluminum oxide;
Step 5: red mud is dried rear feeding batch bin, mix with coal and iron powder, red mud: coal: iron powder=9:10:5, prereduction is carried out with coal gas of high temperature (temperature is 900 DEG C) in rotary kiln, then in electric furnace, add coal dust and lime carry out molten point of reduction, obtain molten iron, tail gas and slag, tail gas can be used as prereduction coal gas after treatment, also can be used in Aluminium hydroxide roasting operation;
Step 6: allocate 60 parts of building wastes and 0.05 part of fluoride salt mix and blend in electric-furnace slag after, make adobe by brick press, reburn and obtain brick body; Barium sulfate is made the powdery that granularity is 300, by weight, after fully being mixed with 70 parts of sodium silicate solutions by 25 parts of barium sulfate, obtain mixed solution; Make brick body soak post-drying in mixed solution, obtain finished bricks.
4. the method for comprehensive utilization of high-iron bauxite as claimed in claim 1, is characterized in that: test Henan high-iron bauxite by the inventive method, Al in these mineral
2o
3content is 37.58%, SiO
2content is 6.34%, and alumina silica ratio is 5.93, Fe
2o
3content is 29.36%;
Step one: by above-mentioned high-iron bauxite stone, drying, fragmentation, is finely ground to 60 orders;
Step 2: in the high-iron bauxite stone flour after step one processes, add the CaO of 30% in ore, with the stripping at 300 DEG C of temperature of industrial circulating mother liquor, dissolution time is 120min, obtains Al
2o
3solubility rate is 81.66%, and red mud alkalinity is 0.53%;
Step 3: dissolved mineral slurry passes through dilution, atmospheric silicon removing in groove, and desiliconization time 5 hours, is pumped into separation tank afterwards and carries out settlement separate, obtain dissolution fluid and red mud;
Step 4: add aluminium hydroxide crystal seed in dissolution fluid, obtains aluminium hydroxide and circulating mother liquor, and circulating mother liquor can be used for the process in leaching of step 2; Aluminium hydroxide through the high-temperature roasting of about 1000 DEG C, removes moisture in rotary kiln, and transforming crystalline becomes aluminum oxide;
Step 5: red mud is dried rear feeding batch bin, mix with coal and iron powder, red mud: coal: iron powder=9:10:5, prereduction is carried out with coal gas of high temperature (temperature is 1000 DEG C) in rotary kiln, then in electric furnace, add coal dust and lime carry out molten point of reduction, obtain molten iron, tail gas and slag, tail gas can be used as prereduction coal gas after treatment, also can be used in Aluminium hydroxide roasting operation;
Step 6: allocate 80 parts of building wastes and 0.3 part of fluoride salt mix and blend in electric-furnace slag after, make adobe by brick press, reburn and obtain brick body;
Barium sulfate is made the powdery that granularity is 250, by weight, after fully being mixed with 70 parts of sodium silicate solutions by 30 parts of barium sulfate, obtain mixed solution; Make brick body soak post-drying in mixed solution, obtain finished bricks.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107200340A (en) * | 2017-07-12 | 2017-09-26 | 长沙紫宸科技开发有限公司 | A kind of alumina producing alkali hydrazine joint reduction dissolving-out method |
| CN113649523A (en) * | 2021-08-18 | 2021-11-16 | 贵州黄平富城实业有限公司 | Raw material ore pretreatment process for bauxite processing |
-
2014
- 2014-07-31 CN CN201410372083.7A patent/CN105314661A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107200340A (en) * | 2017-07-12 | 2017-09-26 | 长沙紫宸科技开发有限公司 | A kind of alumina producing alkali hydrazine joint reduction dissolving-out method |
| CN113649523A (en) * | 2021-08-18 | 2021-11-16 | 贵州黄平富城实业有限公司 | Raw material ore pretreatment process for bauxite processing |
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