CN1031936C - Techinological recipe of magnesia-chrome sand - Google Patents
Techinological recipe of magnesia-chrome sand Download PDFInfo
- Publication number
- CN1031936C CN1031936C CN 92106296 CN92106296A CN1031936C CN 1031936 C CN1031936 C CN 1031936C CN 92106296 CN92106296 CN 92106296 CN 92106296 A CN92106296 A CN 92106296A CN 1031936 C CN1031936 C CN 1031936C
- Authority
- CN
- China
- Prior art keywords
- magnesia
- millimeter
- particles
- oxide
- chrome sand
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Abstract
The present invention relates to a technical recipe of magnesia-chrome sand, which comprises sintered magnesium oxide (70 to 80%), chromium oxide (3 to 8%), ferric oxide (4 to 10%), calcium oxide (2 to 6%) and silicon dioxide (4.0 to 5.5%). A product of the technical recipe of magnesia-chrome sand is formed by mixing materials, forming a ball, drying, burning, pulverizing, screening, proportioning particle sizes and stirring. Particles comprise (ratios by weight) 40 to 55 of particles with the particle size of 3 to 5 millimeters, 20 to 45 of particles with the particle size of 1 to 3 millimeters, 10 to 20 of particles with the particle size of 0.088 millimeter and smaller than 5 of particles with the particle size of smaller than 0.088 millimeter. The technical recipe of magnesia-chrome sand has the advantages of low price, simple manufacturing technology, no use of binding materials, convenient use, capability of quickly sintering at high temperature and good application effect on an open-hearth furnace and an electric furnace.
Description
The invention belongs to open hearth, electric furnace fettling material development technical field.
Open hearth, electric furnace furnace wall are the significant points of bearing mechanical shock, temperature variation and chemical erosion etc. in smelting process.Particularly the slag lining of 200～350 millimeters of thickness of slag layer is subjected to the complicated each other chemical action of various elements in the high temperature sludge liquid, and is particularly serious to its erosion.Therefore both at home and abroad always the development of open hearth, electric furnace fettling material, be considered as gordian technique.Everybody is research and inquirement constantly, and hope can have a kind of such mending material, and is both high temperature resistant, again chemical resistance of concrete and strong adhesion.To improve operating rate and to reduce materials consumption.
U.S. Pat 4168177 discloses a kind of spray repair furnace charge.This furnace charge is that used basic oxygen furnace backup lining brick is processed into the mgo refractory particle, adds 2～14% binder making again and forms.
Component is as follows:
The best proportioning of material name proportioning (weight %)
(weight %)
Magnesium oxide 78～97 90
Anhydrous sodium metasilicate 1～7 3
Aqueous sodium carbonate 1～7 3 are arranged
Tempering bentonite 1～8 4
The characteristics of this material are that good clinging power is arranged---the recovery of minimum and higher intensity.But its cost height, and need to adopt spray repairing machine, therefore be not suitable for big open hearth.
For many years, fettling adopts fettling machine or trough button always.The fettling material that adopts has following several: (table is seen the literary composition back)
The sintering mechanism of above-mentioned materials is to utilize iron magnesium infinitely to consolidate the generation acceleration of sintering of molten and other eutectic mineral.But its resistivity against fire and slag resistance are relatively poor, and particularly dross is serious, erosion is serious.Whenever go out one heat steel and mend a stove.With since the oxygen, more and more incompatibility has needed above-mentioned mending material at the open hearth electric furnace.
The objective of the invention is, providing a kind of is oikocryst by magnesium oxide, and chromium sesquioxide and ferric oxide resultant are that main matrix, silicate are the technical formula of a kind of magnesia-chrome sand of cementing matter.
It is that oikocryst, chromium trioxide and ferric oxide resultant are that main matrix, calcium silicon ratio are about 1 (CaO/SiO that the present invention has selected under the high temperature with magnesium oxide (2/3 reburned magnesia, 1/3 magnesia unslacked)
2≈ 1, mole ratio), silicate is cementing matter.
The technical formula of this magnesia is:
Material name scope optimum range
(weight ratio) (weight ratio)
Magnesium oxide (MgO) 70～80 75～78
Chromium dioxide (Cr
2O
3) 3～8 4～6
Ferric oxide (Fe
2O
3) 4～10 5～7
Calcium oxide (CaO) 2～6 3～5
Silicon-dioxide (SiO
2) 4.0～5.5＜5.0
The granularity and the grain grade proportion of magnesia-chrome sand are as follows:
The best grain grade proportion of granularity grain grade proportion
(weight) (weight)
3～5 millimeter 40～55 45～50
1～3 millimeter 20～45 25～40
0.088～1 millimeter 10～20 10～15
＜0.088 millimeter＜5＜5
The magnesia-chrome sand of this prescription, add chromite ore fine and steel rolling iron sheet fine powder is pressed proportion ingredient by the magnesium oxide after the calcination and calcium oxide (unslaked lime) fine powder, through batch mixing, balling-up, drying, calcination, be finished product through fragmentation, pulverizing, screening, grain grade proportion, stirring again.The preparation method of preparation method and other mending material is basic identical.
Because chromium sesquioxide (Cr
2O
3) adding, at high temperature generate magnesia chrome spinel and part magnesium-chromium-iron Solid solution and exist, can strengthen anti-slag wetting capacity, also be difficult for dross simultaneously, with its fettling surface-brightening.Can mend a stove every 2～3 stoves.
The advantage of this prescription magnesia-chrome sand is, manufacturing process and fettling are simple to operate and can at high temperature very fast sintering; Double bed top blowing oxygen open hearth and 300t top oxygen uptake open hearth in 100t * 2, and use on the electric furnace, respond well, and product price is cheap.
By the technical formula (containing component and grain grade proportion) of this magnesia, can make the product of the present invention's prescription with the preparation technology of general magnesia-chrome sand.
Claims (3)
1. a magnesia-chrome sand fettling material is characterized in that the chemical constitution weight ratio is,
Magnesium oxide (MgO) 70～80
Chromium sesquioxide (Cr
2O
3) 3～8
Ferric oxide (Fe
2O
3) 4～10
Calcium oxide (CaO) 2～6
Silicon-dioxide (SiO
2) 4.0～5.5
Its granularity and grain grade proportion one weight ratio be,
3～5 millimeter 40～55
1～3 millimeter 20～45
0.088～1 millimeter 10～20
＜0.088 millimeter＜5
2. magnesia-chrome sand fettling material according to claim 1 is characterized in that the good value of amount of each composition weight ratio is,
Magnesium oxide (MgO) 75～78
Chromium sesquioxide (Cr
2O
3) 4～6
Ferric oxide (Fe
2O
2) 5～7
Calcium oxide (CaO) 3～5
Silicon-dioxide (SiO
2)＜5.0
The optimum value of its various granularity grain grade proportions is,
3～5 millimeter 45～50
1～3 millimeter 25～40
0.088～1 millimeter 10～15
＜0.088 millimeter＜5
3. magnesia-chrome sand fettling material according to claim 1 is characterized in that in the magnesium oxide that 2/3 attaches most importance to and burns magnesia, 1/3 and be caustic-calcined magnesite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92106296 CN1031936C (en) | 1992-07-06 | 1992-07-06 | Techinological recipe of magnesia-chrome sand |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92106296 CN1031936C (en) | 1992-07-06 | 1992-07-06 | Techinological recipe of magnesia-chrome sand |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1067642A CN1067642A (en) | 1993-01-06 |
| CN1031936C true CN1031936C (en) | 1996-06-05 |
Family
ID=4941986
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92106296 Expired - Fee Related CN1031936C (en) | 1992-07-06 | 1992-07-06 | Techinological recipe of magnesia-chrome sand |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1031936C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1056129C (en) * | 1996-04-26 | 2000-09-06 | 柳州铁路局工程处第一建筑工程段 | Brickkiln patching material |
| CN1293208C (en) * | 2005-05-18 | 2007-01-03 | 季男 | Steel-smelting converter slag line dry subsidizing method |
| CN102718508A (en) * | 2012-02-23 | 2012-10-10 | 沈恩有 | Application of magnesite composite material preparation method in nickel-iron high carbon ferrochrome production by submerged arc furnace |
-
1992
- 1992-07-06 CN CN 92106296 patent/CN1031936C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1067642A (en) | 1993-01-06 |
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|---|---|---|---|
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| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |