CN1026404C - Producing method for sub-whit-corundum and its product - Google Patents
Producing method for sub-whit-corundum and its product Download PDFInfo
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- CN1026404C CN1026404C CN 91100999 CN91100999A CN1026404C CN 1026404 C CN1026404 C CN 1026404C CN 91100999 CN91100999 CN 91100999 CN 91100999 A CN91100999 A CN 91100999A CN 1026404 C CN1026404 C CN 1026404C
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Abstract
The present invention relates to a producing method for sub-white-corundum and sub-white-corundum, which belongs to the corundum raw material of a fire resisting material. In the producing method for sub-white-corundum, bauxite, iron dust and carbon materials which having Al/Si higher than 16 and CaO+MgO lower than 0.5% are used as main raw materials and are melted and reduced in an arc furnace, impurities are removed by enhancing the quantity of the added carbon, adding an additive agent and lowering secondary voltage in the later stage of a smelting process, and the sub-white-corundum for the production of the advanced fire resisting material is obtained. Compared with the production cost of white-corundum, the production cost of the sub-white-corundum is lowered by 1/3 to 1/2, and the sub-white-corundum can be used for abrasive fillers.
Description
The present invention relates to a kind ofly produce Al with bauxitic clay
2O
3Content is higher than the production method of 98.5% fused corundom, and its product mainly is used as raw material for refractory, also can do the raw material of abrasive material.
In general, the normal diamantine raw material that uses of refractory materials production has white fused alumina and brown corundum.White fused alumina is to make raw material with commercial alumina, in electric arc furnace, and the very high white corundum crystal of making through the high temperature melting recrystallize of a kind of purity, its main chemical Al
2O
3Content more than 98.5%.Because white fused alumina is to make with commercial alumina, its cost height, price are expensive, certainly will increase the production cost and the price of refractory materials.Influence its application.The palm fibre corundum is the brown corundum of producing through fusing in electric arc furnace with bauxitic clay, iron filings, three kinds of raw materials of carbon materials, its main chemical Al
2O
3Content be in 94.5%～97% scope, its price is more cheap than white fused alumina, but owing to limited by existing smelting technology, purity is not high, and the desirable feedstock of nonproductive high grade refractory.As everyone knows, the fast development of industrial technologies such as modern metallurgy, chemical industry has become everybody to ask to the physicochemical property requirement refractory raw material more and more high, inexpensive, that matter is pure of refractory materials.Therefore, seeking a kind of new smelting process, produce starting material cheap than white fused alumina, that quality approaches white fused alumina, has been corundum manufacturer and the common serious hope of using producer.
The objective of the invention is to select for use the bauxitic clay low than the commercial alumina price is main raw material, improves existing brown corundum production method, proposes a kind ofly to improve refining effect, removes impurity, produces Al inexpensive, of fine quality
2O
3Content is higher than the method for 98.5% fused corundom.
The object of the present invention is achieved like this:
Describedly directly smelt Al with bauxitic clay
2O
3The production method that content is higher than 98.5% fused corundom is to make main raw material with bauxitic clay, iron filings, carbon materials, adds in the electric arc furnace through mixing, and after pyrotic smelting and impurity reduction, crystallisation by cooling becomes frit, and is broken through beating again, sorting and obtain said corundum.
Characteristics of the present invention are:
1, bauxitic clay is alumine, wherein Al
2O
3/ SiO
2＞16, CaO+MgO＜0.5%;
2, add into 30～40% than calculated value as the add-on of the carbon materials of reductive agent, based on 100 weight part bauxitic clays, its calculated value is tried to achieve by following formula:
Carbon materials Theoretical Calculation add-on=
(100(0.4SiO
2%+0.225Fe
2O
3%+0.3TiO
2%))/(C%)
3, iron filings and bauxitic clay, carbon materials mixing add, and based on 100 weight part bauxitic clays, its add-on is tried to achieve by following formula:
Iron filings add-on=(100 (0.467SiO
2%R-0.7Fe
2O
3%))/(Fe%)
4, add additive in refining period, this additive is selected from aluminum chloride, one of chlorine and aluminium bits;
5, turn down operating voltage in refining period.
Positively effect of the present invention is can produce its main chemical Al with the price bauxitic clay more much lower than commercial alumina
2O
3Content is higher than the corundum more than 98.5%, and its production cost reduces by 1/3～1/2 than white fused alumina, can replace white fused alumina with said corundum and do high grade refractory and abrasive material.
Accompanying drawing 1 is the technological process of production figure of said corundum.
Now in conjunction with the accompanying drawings method of the present invention is further described.
Raw material:
Bauxitic clay: bauxitic clay system adopts alumine, wherein Al
2O
3/ SiO
2＞16, CaO+MgO＜0.5% is crushed to and is suitable for formula d
Bauxitic clay=5d
CarbonGranularity
In the formula: d
Bauxitic clayThe granularity of-bauxitic clay (millimeter)
d
CarbonThe granularity of-carbon materials (millimeter)
Iron filings: require Fe 〉=88%, Si≤2.5% will sieve or chooses inclusion is removed.
Carbon materials: as the reductive agent of smelting corundum, be used for reducing impurity in the bauxitic clay, can select refinery coke, coke, hard coal for use.Carbon content 〉=75%, present embodiment adopts hard coal, is 5～10 millimeters through being crushed to granularity.
Batching: based on 100 weight part bauxitic clays.
1, carbon materials Theoretical Calculation add-on is calculated as follows:
The carbon materials add-on=
(100(0.4SiO
2%+0.225Fe
2O
3%+0.3TiO
2%))/(C%)
SiO in the formula
2%, Fe
2O
3%, TiO
2% represents SiO in the bauxitic clay respectively
2, Fe
2O
3And TiO
2Content, C% is a fixed carbon content in the carbon materials;
The present invention adds into 30～40% than Theoretical Calculation add-on as the carbon materials add-on of reductive agent.
2, the iron filings add-on is tried to achieve by following formula:
Iron filings add-on=(100 (0.467SiO
2%R-0.7Fe
2O
3))/(Fe%)
SiO in the formula
2%, Fe
2O
3% is SiO in the bauxitic clay
2, Fe
2O
3Content, Fe% are iron content in the iron filings.
R is the ratio of iron, silicon in the ferrosilicon that promptly generates of iron silicon ratio, and R of the present invention is 6.
The raw material of getting ready (bauxitic clay, carbon materials, iron filings) is packed into behind the batch mixing in the stove through batching, smelts, in order to improve the purified effect, the present invention adds additive in refining period, and this additive is selected from one of aluminum chloride, chlorine and aluminium bits, and turn down operating voltage, in order to the SiO of remnants
2, Fe
2O
3, TiO
2Further reduction, reach the purpose that impurity elimination is purified.
Additive that adds such as aluminum chloride, chlorine and aluminium bits, its add-on are calculated by following formula:
Aluminum chloride add-on=(t (1.654Fe
2O
3%+2.941SiO
2%+5.515TiO
2%))/(AlCl
3%)
Chlorine add-on=(t (1.331Fe
2O
3%+1.183SiO
2%+1.919TiO
2%))/(Cl
2%)
Aluminium bits add-on=(t (0.338Fe
2O
3%+0.6SiO
2%+1.125TiO
2%))/(Al%)
In the formula: t is the gross weight of corundum solution, Fe
2O
3%, SiO
2%, TiO
2% is respectively the Fe that remains in after the reduction in the corundum solution
2O
3, SiO
2, TiO
2Content, AlCl
3% is AlCl in the industrial aluminum chloride
3Content, Cl
2% is the Cl in the chlorine
2Content, Al% is the Al content in the aluminium bits.
Chlorine feeds in the corundum solution with graphite guide tube.
Turn down operating voltage in refining period, should meet following formula:
In the formula: V is an operating voltage
K is a coefficient, gets 8～11, and k value of the present invention is 9, and KVA is an electric arc furnace power.
Smelt good corundum, first naturally cooling, treat that liquation solidifies substantially after, the quick cooling of watering, cooling back gained frit through beating broken sorting, obtains crystal block, promptly said corundum.Its Chemical Composition (%) is:
Al
2O
3≥98.5
SiO
2<1.0
TiO
2<0.6
Fe
2O
3<0.4
C≤0.15
Its physicals is:
Apparent porosity (%)＜4,
Refractoriness (℃) 〉=1790
True specific gravity (g/cm
3) 〉=3.9
Because the product colour of being produced is canescence, physical and chemical index and white fused alumina are comparatively approaching, and therefore, the industry also has the people that the fused corundom of smelting with bauxitic clay with above-mentioned physicochemical characteristics is called " sub-white corundum ".
Claims (6)
1, a kind of Al
2O
3Content is higher than the production method of 98.5% fused corundom, it is characterized in that with bauxitic clay, iron filings, carbon materials as main raw material smelting reduction in electric arc furnace, wherein:
(1) bauxitic clay is an alumine, wherein:
Al
2O
3/SiO
2＞16 CaO+MgO＜0.5%；
(2) add into 30-40% than calculated value as the carbon materials add-on of reductive agent, based on 100 weight part bauxitic clays, its calculated value is tried to achieve by following formula:
Carbon materials Theoretical Calculation add-on=(100 (0.1SiO
2%+0.225Fe
2O
3%+0.3TiO
2%))/(C%)
SiO in the formula
2%, Fe
2O
3%, TiO
2% represents SiO in the bauxitic clay respectively
2, Fe
2O
3And TiO
2Content, C% is a fixed carbon content in the carbon materials;
(3) iron filings and bauxitic clay, carbon materials mixing add, and based on 100 weight part bauxitic clays, its add-on is tried to achieve by following formula:
Iron filings add-on=(100 (0.467SiO
2%R-0.7Fe
2O
3))/(Fe%)
SiO in the formula
2%, Fe
2O
3% is SiO in the bauxitic clay
2, Fe
2O
3Content, Fe% are iron content in the iron filings, and R is an iron silicon ratio, and R gets 6;
(4) add additive in refining period, this additive is selected from one of aluminum chloride, chlorine and aluminium bits;
(5) turn down operating voltage in refining period.
2, method according to claim 1, it is characterized in that: additive is selected aluminum chloride for use, and its add-on should meet following formula:
Aluminum chloride add-on=(t (1.654Fe
2O
3%+2.941SiO
2%+5.515TiO
2%))/(AlCl
3%)
T is the gross weight of corundum solution in the formula, Fe
2O
3%, SiO
2%, TiO
2% is respectively the Fe that remains in after the reduction in the corundum solution
2O
3, SiO
2, TiO
2Content, AlCl
3% is AlCl in the industrial aluminum chloride
3Content.
3, method according to claim 1 is characterized in that: additive also can be selected chlorine for use, and its add-on should meet following formula:
Chlorine add-on=(t (1.331Fe
2O
3%+1.183SiO
2%+1.919TiO
2%))/(Cl
2%)
T is the gross weight of corundum solution, wherein Fe in the formula
2O
3%, SiO
2%, TiO
2% is respectively the Fe that remains in after the reduction in the corundum melt
2O
3, SiO
2, TiO
2Content, Cl
2% is the Cl in the chlorine
2Content.
4, method according to claim 3 is characterized in that: with graphite guide tube chlorine is fed in the corundum melt.
5, method according to claim 1 is characterized in that: additive can also aluminium be considered to be worth doing, and its add-on should meet following formula:
Aluminium bits add-on=(t (0.338Fe
2O
3%+0.6SiO
2%+1.125TiO
2%))/(Al%)
T is the gross weight of corundum solution in the formula, Fe
2O
3%, SiO
2%, TiO
2% is respectively the Fe that remains in after the reduction in the corundum solution
2O
3, SiO
2, TiO
2Content, the Al content in the Al% aluminium bits.
6, according to the described method of one of claim 1～5, it is characterized in that: turn down operating voltage in refining period, should meet following formula:
V is an operating voltage in the formula, and k is that coefficient gets 9, and KVA is an electric arc furnace power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91100999 CN1026404C (en) | 1991-02-13 | 1991-02-13 | Producing method for sub-whit-corundum and its product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91100999 CN1026404C (en) | 1991-02-13 | 1991-02-13 | Producing method for sub-whit-corundum and its product |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1064259A CN1064259A (en) | 1992-09-09 |
| CN1026404C true CN1026404C (en) | 1994-11-02 |
Family
ID=4904912
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91100999 Revoked CN1026404C (en) | 1991-02-13 | 1991-02-13 | Producing method for sub-whit-corundum and its product |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1026404C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101544389B (en) * | 2009-04-24 | 2011-06-15 | 西安易升电子有限公司 | Method for preparing high-purity electro-melting corundum aluminum oxide epoxy casting filler |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1319903C (en) * | 2003-04-02 | 2007-06-06 | 谢正富 | Method for making slag brick |
| CN100360411C (en) * | 2005-03-10 | 2008-01-09 | 沈兰英 | Method of smelting bauxite corundum |
| CN102199041B (en) * | 2011-03-21 | 2013-03-27 | 焦作市山阳亚白刚玉厂 | Sub-white corundum and production method thereof |
| DE102011087147B4 (en) | 2011-11-25 | 2015-02-26 | C.A.R.R.D. Gmbh | Titanium oxide-containing aluminum oxide particles based on alumina melted in calcined alumina in an electric arc furnace, and a process for their production and their use |
| CN104445319B (en) * | 2014-11-25 | 2018-08-24 | 巩义市时创新材料孵化器有限公司 | A kind of smelting process for the corundum being suitble to do Sialon material feedstocks |
| CN108585882A (en) * | 2018-05-15 | 2018-09-28 | 李明建 | A kind of raw material and its production method of function alundum |
| CN108996997B (en) * | 2018-10-08 | 2021-03-26 | 贵州银星新材料科技有限公司 | Bauxite smelting method |
-
1991
- 1991-02-13 CN CN 91100999 patent/CN1026404C/en not_active Revoked
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101544389B (en) * | 2009-04-24 | 2011-06-15 | 西安易升电子有限公司 | Method for preparing high-purity electro-melting corundum aluminum oxide epoxy casting filler |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1064259A (en) | 1992-09-09 |
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