CN101913892B - Method for producing homogenized alumina - Google Patents
Method for producing homogenized alumina Download PDFInfo
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- CN101913892B CN101913892B CN 201010272788 CN201010272788A CN101913892B CN 101913892 B CN101913892 B CN 101913892B CN 201010272788 CN201010272788 CN 201010272788 CN 201010272788 A CN201010272788 A CN 201010272788A CN 101913892 B CN101913892 B CN 101913892B
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- alumina
- pug
- homogenized alumina
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- deironing
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Abstract
The invention discloses a method for producing a homogenized alumina material, and belongs to the technical field of ceramic and refractory materials. The homogenized alumina is prepared from high bauxite raw ore serving as a raw material by the steps of crushing, wet pulverizing, deironing, spray drying, molding, firing and the like; the method has the characteristics of simple process, easy operation, low cost, good mouldability and difficult bursting of the homogenized alumina after entering a kiln, and the like; and the homogenized alumina has the main crystalline phase of corundum and mullite, livid fracture, compact texture and regular crystal grain growth.
Description
Technical field
The invention belongs to pottery, technical field of refractory materials, relate to a kind of method of producing homogenized alumina.
Background technology
At present, the working method of bauxite chamotte mainly takes the raw ore behind the pick is directly carried out the method for sintering, is about to raw material and directly puts into the kilns such as down-draft kiln, tunnel furnace, square kiln and carry out sintering; Also have raw ore is crushed to certain granularity through behind the pick, in rotary kiln, carry out sintering.Although these methods are through the pick of raw material, because Al in the raw material piece
2O
3Content unstable, cause sintering after clinker quality still inhomogeneous.For higher-grade bauxitic clay (Al
2O
3, greater than 85%), the homogeneity of bauxitic clay grog is quite a lot of after burning.
Be accompanied by decades to application and the outlet of higher-grade bauxitic clay, present higher-grade alumina is fewer and feweri, utilizable substantially be in, low-grade resource, and the homogeneity of the alumina of these grades differs larger.For the inhomogeneous adverse effect of reduction quality, take full advantage of these resources, the domestic research of carrying out homogenization material.
So-called alumina homogenization material namely is take natural raw bauxite as raw material, by explained hereafter refractory raw materials out such as homogenizing, moulding, calcinings, alumina homogenization material compare with raw ore calcining material have properity and quality evenly, the advantage such as stable.
A kind of production method of producing homogenization material is disclosed in the patent No. is 200810053036.0 document, it is to adopt the kiln firing process take alumine as raw material, through 1. homogenizing broken process, 2. the dry method powder-grinding process, 3. 6. wet-milling pulping process, 4. flotation operation, 5. press filtration, old operation squeeze mud, drying process and the 7. multiple tracks treatment process such as calcination process.The described method of this patent, although the quality product of producing is better, complex procedures, cost are higher, have limited application.
The method of another kind of production alumina homogenization material is disclosed in the patent documentation of publication number CN101108776A, it is to adopt the kiln firing process take alumine as raw material, through 1. homogenizing broken process, 2. wet-milling, 3. ageing mixture, 4. drying, 5. bolting, 6. moulding and the 7. operation such as calcining.Wherein sieve and limited granularity in the operation at 0.5-1.0mm, this production for alumina homogenization material not only is difficult to realize, and will greatly increases cost.
Summary of the invention
For the production technique of simplifying alumina homogenization material, be convenient to implement, reduce production costs, the present invention proposes novel process, novel method based on the production alumina homogenization material of spraying drying and dry-press process base substrate.Described method is: after the bauxitic clay rawore is broken into fritter, the water and the admixture that add 30-40%, with its wet grinding to the 300-500 order, the pug that obtains enters the ageing mixture pond, utilize tramp iron separator that pug is carried out deironing and process, the recycling spray-drying tower carries out spraying drying, obtains dry method straight forming behind the particulate state alumina, base substrate after the moulding burns till in high temperature kiln, can make alumina homogenization material.
After the fragmentation of described alumina rawore basically particle diameter be convenient to follow-up wet grinding not greater than the fragment of 10mm.
Add the purpose of admixture during described wet grinding for suppressing powder reuniting, be preferably organic dispersing agent, such as polyvinyl alcohol etc., add-on must not surpass 0.5%.
After described pug carried out spraying drying, moisture content was less than 4%.
The described false particulate state powder direct voltage that utilizes spraying drying to form that is shaped to is pressed into suitable base substrate, in order to burning till.
Described high temperature kiln is that firing temperature is 1500-1600 ℃ take tunnel furnace as best.
Technique scheme of the present invention compared with prior art has the following advantages:
(1) operation is simple, easy handling, and cost is lower;
(2) spraying drying brings up a large amount of false particles, and the venting quality of the moment of false particle when moulding is very good, the slabbing when having avoided moulding, simultaneously, because moisture content is lower, so, through the molding of this operation not drying greatly improved efficient directly into kiln;
(3) avoided the base substrate of existing wet moulding to enter explosion problem in the kiln;
Embodiment
Embodiment 1
Method take the bauxitic clay rawore of aluminium content as 73% as raw material production bauxitic clay homogenization material may further comprise the steps:
(1) be that the piece footpath is less than the fragment of 10mm with alumina raw material bulk crushing.
(2) the raw material piece that fragmentation is good joins in the ball mill, adds simultaneously the water of 30-40% and 0.2% polyvinyl alcohol and grinds; Be ground to discharging behind the 300-500 order.
(3) ground pug is got to carried out deironing in the ageing mixture pond, it is 10000-12000 Gauss's wet method magnetic deironing device that magnetic intensity is adopted in deironing.
(4) the wet type pug after the deironing is got to carried out drying in the spray-dryer, dried pug moisture is less than 4%.
(5) utilize the powder direct voltage after the spraying drying to be shaped to base substrate.
(6) the base substrate code is directly pushed in the tunnel furnace on kiln car both can burn till, firing temperature is controlled at 1550-1600 ℃.
Embodiment 2
Method take the bauxitic clay rawore of aluminium content as 67% as raw material production bauxitic clay homogenization material may further comprise the steps:
(1) be that the piece footpath is less than the fragment of 10mm with alumina raw material bulk crushing.
(2) the raw material piece that fragmentation is good joins in the ball mill, adds simultaneously the water of 30-40% and 0.2% polyvinyl alcohol and grinds; Be ground to discharging behind the 300-500 order.
(3) ground pug is got to carried out deironing in the ageing mixture pond, it is 10000-12000 Gauss's wet method magnetic deironing device that magnetic intensity is adopted in deironing.
(4) the wet type pug after the deironing is got to carried out drying in the spray-dryer, dried pug moisture is less than 4%.
(5) utilize the powder direct voltage after the spraying drying to be shaped to base substrate.
(6) the base substrate code is directly pushed in the tunnel furnace on kiln car both can burn till, firing temperature is controlled at 1500-1550 ℃.
The product that adopts the present invention to produce, principal crystalline phase is corundum and mullite, and fracture is lividity, and quality is fine and close, and crystal grain is grown rule, reaches domestic homogenization material level of producing.
Claims (1)
1. method of producing homogenized alumina, it is characterized in that: after the bauxitic clay rawore is broken into fritter, add the water of 30-40% and be no more than 0.5% polyvinyl alcohol, with its wet grinding to the 300-500 order, the pug that obtains enters the ageing mixture pond, utilizing tramp iron separator that pug is carried out deironing processes, the recycling spray-drying tower carries out spraying drying, obtain moisture content less than 4% particulate state alumina after the dry method straight forming, base substrate after the moulding carries out 1500-1600 ℃ and burns till in high temperature kiln, can make alumina homogenization material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010272788 CN101913892B (en) | 2010-09-06 | 2010-09-06 | Method for producing homogenized alumina |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010272788 CN101913892B (en) | 2010-09-06 | 2010-09-06 | Method for producing homogenized alumina |
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| Publication Number | Publication Date |
|---|---|
| CN101913892A CN101913892A (en) | 2010-12-15 |
| CN101913892B true CN101913892B (en) | 2013-02-13 |
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| CN 201010272788 Active CN101913892B (en) | 2010-09-06 | 2010-09-06 | Method for producing homogenized alumina |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102583470B (en) * | 2012-03-15 | 2014-03-19 | 龚亚云 | Preparation method of homogeneous bauxite applicable to smelting of brown fused alumina |
| CN102826862A (en) * | 2012-09-04 | 2012-12-19 | 山西新型炉业集团有限公司 | Raw material proportion and producing method for bauxite-based dense homogenized grog |
| CN105503219A (en) * | 2015-12-29 | 2016-04-20 | 通达耐火技术股份有限公司 | Alumina-base sintered corundum mullite and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1199033A (en) * | 1998-05-18 | 1998-11-18 | 武汉工业大学 | Fine alumina ceramic preparation process using natural bauxite |
| CN101108776A (en) * | 2007-08-18 | 2008-01-23 | 欧阳可成 | Technique of producing shaped aluminum basis equalized flame-proof raw material with wet process flouring-semidry process |
| CN101121604A (en) * | 2007-07-25 | 2008-02-13 | 濮阳濮耐高温材料（集团）股份有限公司 | Method for producing alumina homogenization material |
-
2010
- 2010-09-06 CN CN 201010272788 patent/CN101913892B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1199033A (en) * | 1998-05-18 | 1998-11-18 | 武汉工业大学 | Fine alumina ceramic preparation process using natural bauxite |
| CN101121604A (en) * | 2007-07-25 | 2008-02-13 | 濮阳濮耐高温材料（集团）股份有限公司 | Method for producing alumina homogenization material |
| CN101108776A (en) * | 2007-08-18 | 2008-01-23 | 欧阳可成 | Technique of producing shaped aluminum basis equalized flame-proof raw material with wet process flouring-semidry process |
Non-Patent Citations (1)
| Title |
|---|
| 钟余发等.利用离心喷雾干燥制备球形粉体的工艺因素研究.《材料导报》.2009,第23卷147页至150页. * |
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| CN101913892A (en) | 2010-12-15 |
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Address after: 030100 Yangqu County, Shanxi province finance street, No., No. 5 Patentee after: Shanxi Gaoke Refractories Co., Ltd. Address before: 030006 No. 280, Changzhi Road, hi tech Zone, Shanxi, Taiyuan Patentee before: Shanxi Gaoke Refractories Co., Ltd. |
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