CN1281905A - Production method of high-grade silicon-calcium alloy and its ore-smelting electric furnace - Google Patents
Production method of high-grade silicon-calcium alloy and its ore-smelting electric furnace Download PDFInfo
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- CN1281905A CN1281905A CN 99110872 CN99110872A CN1281905A CN 1281905 A CN1281905 A CN 1281905A CN 99110872 CN99110872 CN 99110872 CN 99110872 A CN99110872 A CN 99110872A CN 1281905 A CN1281905 A CN 1281905A
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Abstract
The present invention relates to a production method of high-grade calcium silicon alloy and its ore-smelting electric furnace. It is mainly characterized by cultivating crucible production process and normal smelting production process of high-grade calcium silicon alloy, utilizing change of raw materials mixing ratio and fully considering characteristics of every raw material, and can effectively reduce contact of CaO and SiO2 at high temp. and reduce generation of low melting-point slag so as to make calcium content in the alloy high and cost low. Said invention is low in electric consumption, the calcium content can be up to 31-45% and the electrode arrangement of said ore-smelting furnace is reasonable, and its furnace life can be up to about one year.
Description
The invention belongs to field of metallurgy, the hot stove in especially a kind of production method of high grade silica-calcium alloy and ore deposit thereof.
Silicocalcium (CaSi) is composite deoxidant, a sweetening agent of smelting high-quality steel, Special Alloy Steel and specific alloy material ideal, also be as nucleating agent and additive in cast iron and the spheroidal graphite cast iron production, become indispensable metallurgical material in high quality steel, high-quality smelting steel and the Foundry Production.The at present external the highest production of silicocalcium contains Ca 25-35%, and China produces silicocalcium and contains Ca 24-31%.Along with the continuous development of metallurgy industry, demand silicocalcium amount constantly increases both at home and abroad, especially to high grade silica-calcium alloy (containing Ca more than 31%).There are a lot of shortcomings in existing silicocalcium production, and first production technique is science not very, and crucible is cultivated unreasonable; The mode that raw material add to adopt " cauldron is braised " or alternately adds is not considered every kind of raw material self characteristics, causes production cost height, product grade low; It two is unreasonable structure of its hot stove in production unit-ore deposit, causes furnace life short, and furnace life generally is one month to three months, and the time of coming out of the stove is 6-8 hour, yields poorly the energy consumption height.
The objective of the invention is to overcome the deficiency of prior art, the processing method of a kind of high grade silica-calcium alloy (calcic is more than 31%) is provided, and a kind of hot stove in ore deposit with furnace life length, the time weak point of coming out of the stove.
The object of the present invention is achieved like this:
The raw material weight proportioning of cultivating the high grade silica-calcium alloy crucible is:
Silica: 56-60%
Lime: 20-24%
Coke: 17-19%
Charcoal: 2-4%
The processing step of cultivating crucible is:
1. add silica bed material 60-80kg,, fire box temperature is risen between 1000-1400 ℃ to the electrodes in mine hot stove energising;
2. add lime and coke compound along three electrode perimeter, add 23-26kg at every turn, added once, and added in 4 hours in every interval 15-20 minute;
3. add silica and coke compound along three electrode perimeter, add 28-32kg at every turn, added once, and added in 4 hours in every interval 15-20 minute;
4. add silica and charcoal compound along three electrode perimeter, add 21-26kg at every turn, added once, and added in 4 hours in every interval 15-20 minute;
Above-mentioned 2., 3., 4. in the processing step, after compound adds each time, promptly slowly fall three electrode 20-40mm, time spent 15-20 minute, and then add compound next time.
5. after three kinds of compounds add, open water outlet, emit the liquation discharging, close water outlet then, crucible was cultivated and was finished this moment.
The raw material weight proportioning of high grade silica-calcium alloy ordinary production is:
Silica: 52-56%
Lime: 20-24%
Coke: 18-22%
Charcoal: 2-5%
The processing step of high grade silica-calcium alloy ordinary production is:
1. after crucible is made, should guarantee that fire box temperature should be between 1900-2300 ℃ this moment, add lime and coke compound 48-51kg along three electrode perimeter this moment, time spent 15-20 minute, falls electrode 20-40mm then, time spent 15-20 minute;
2. add silica and coke compound 52-56kg along three electrode perimeter, time spent 15-20 minute, fall electrode 20-40mm then, time spent 15-20 minute;
3. add silica and charcoal compound 43-45kg along three electrode perimeter, time spent 15-20 minute, fall electrode 20-40mm then, time spent 15-20 minute;
Repeat 1., 2., 3. in the processing step, add all compounds in 4 hours, the liquid in this moment burner hearth is the high grade silica-calcium alloy calcic.
The lime in the described cultivation crucible processing step and the weight proportion of coke compound are: lime is 68-69%, and coke is 30-32%; The weight proportion of silica and coke compound is: silica is 72-75%, and coke is 24-27%; The weight proportion of silica and charcoal compound is: silica is 88-90%, and charcoal is 9-11%.
The lime in the described high grade silica-calcium alloy ordinary production processing step and the weight proportion of coke compound are: lime is 75-77%, and coke is 23-25%; The weight proportion of silica and coke compound is: silica is 76-78%, and coke is 23-25%; The weight proportion of silica and charcoal compound is: silica is 92-94%, and charcoal is 6-8%.
In employed three electrodes of the hot stove in ore deposit, have its secondary phase current of an electrode to be better than other two other, the depth ratio of the close water outlet of this electrode and its insertion burner hearth is two dark 30-50mm of electrode in addition.
Advantage of the present invention and positively effect are:
1. cultivate crucible and smelting high-grade silicocalcium and adopt the reinforced method of layering,, take into full account every kind of raw material self characteristics, can effectively reduce CaO, SiO by the variation of proportioning raw materials
2At high temperature Jie Chu chance has reduced the generation chance of low melting point slag, and need not add excess carbon, it is less that carbide is generated, furnace bottom rising is slow, and the production cycle prolongs greatly, and the time of coming out of the stove reduced to 4 hours, the rate of recovery of silicon, calcium significantly improves, alloy calcium content height, cost is lower, and power consumption reduces, the silicocalcium content of producing has reached the level of high grade silica-calcium alloy fully at Ca 31-45%.
2. the hot furnace body project organization in ore deposit uniqueness, parameters such as the transformer capacity of selecting for use, operating voltage, electrode diameter, electrode pitch circle diameter, burner hearth internal diameter, furnace depth are very accurate, make crucible cultivate novel structure and be suitable for that the hot stove in ore deposit furnace life reached about 1 year.
Description of drawings:
Fig. 1 is a body of heater front section view of the present invention;
Fig. 2 is that Fig. 1 A-A is to sectional view;
Fig. 3 is the diagrammatic cross-section of crucible in the burner hearth of the present invention;
Fig. 4 is electrode power supply figure.
Embodiment:
Present embodiment is that example is elaborated with the hot stove in 1000KVA ore deposit, and the hot furnace structure of the hot stove in the ore deposit of other capacity and this ore deposit is basic identical.
The smelting high-grade silicocalcium need select to have the hot stove in ore deposit of correct processing parameter, and following parameter all draws through theoretical calculate.
1. transformer capacity: 1000KVA transformer
2. operating voltage: 50-70V
3. electrode diameter: 380mm
4. electrode pitch circle diameter: 1050mm
5. burner hearth internal diameter: 2800mm
6. furnace depth: 1070mm.
(Fig. 1, Fig. 2, Fig. 4) illustrates the furnace binding of the hot stove in ore deposit at first in conjunction with the accompanying drawings.
In circular body of heater 2, be that the distribution of electrodes circle at center is evenly equipped with three electrodes 4 (a), 5 (b, c) with burner hearth 3, wherein electrode a is over against the eye 1 that taps a blast furnace, and the degree of depth that electrode a inserts burner hearth is greater than the degree of depth that electrode b, c insert, the concrete distance of inserting is: electrode a bottom is 80mm apart from furnace bottom, and electrode b, c are 120mm.Power supply figure according to electrode can find out in addition: A, B, C triphasic potential are after transformer 12 transformations, the secondary phase current is greater than the electric current of electrode b, c at the electric current of electrode a, the temperature of electrode a bottom is higher so, thereby the raw material of its bottom melts than very fast, and its viscosity is less, velocity of flow is very fast soon, can drive the liquid-flow of electrode b, c bottom, just smooth and easy when liquid flows out, reduced the furnace bottom settling, shortened the time of coming out of the stove, and furnace life is prolonged.The lifting device of electrode is the lifting of conventional mechanical formula, and present embodiment is no longer narrated.
The production technique of high grade silica-calcium alloy is described in detail in detail below again.
Production technique of the present invention comprises two steps: cultivate crucible production technique and silicocalcium ordinary production technology.
The calcium content of the described high grade silica-calcium alloy of present embodiment is 36%.
Ingredient requirement:
The chemical ingredients of high grade silica-calcium alloy raw material of the present invention and physicals requirement
| Material name | SiO ％ | CaO ％ | C ％ | ％ | S ％ | Ash % | Fugitive constituent % | Moisture % | Viscosity |
| Silica | ≤98 | ?20-45 | |||||||
| Lime | ≤85 | ≥1 | |||||||
| Coke | ≤82 | ≥1 | ≥15 | ≥2 | ≤8 | ?2-6 | |||
| Charcoal | ≤76 | ＜6 | ?15-25 | ≤3 | ?20-80 |
One, cultivates crucible
1. former material assembly:
1. the compound of lime (210kg) and coke (95kg): 305kg altogether;
2. the compound of silica (260kg) and coke (95kg): 355kg altogether;
3. the compound of silica (260kg) and charcoal (30kg): 290kg altogether;
2. processing step:
1. add silica bed material 60kg, to the electrodes in mine hot stove energising, the high arc temperature of electrode makes the fusing of silica bed material and burner hearth is heated up, when fire box temperature rises to 1000-1400 ℃;
2. add lime and coke compound with the filler shovel along three electrode perimeter, add about 25kg at every turn, added once, and added in 4 hours in every interval 15-20 minute;
3. add silica and coke compound with the filler shovel along three electrode perimeter, add about 30kg at every turn, added once, and added in 4 hours in every interval 15-20 minute;
4. add silica and charcoal compound with the filler shovel along three electrode perimeter, add about 24kg at every turn, added once, and added in 4 hours in every interval 15-20 minute;
Above-mentioned 2., 3., 4. in the processing step, after compound adds each time, promptly slowly fall three electrode 20-40mm, time spent 15-20 minute, and then add compound next time.
5. after three kinds of compounds add, open water outlet, emit the liquation discharging, close water outlet then.
The crucible that form this moment as shown in Figure 3.
Water outlet 1, body of heater 2, electrode 4 (a), electrode 5 (b, c), filler shovel 6, sidewall are piled up material 7, compound 8, interior sidewall of crucible 9, liquation 10, outer crucible wall 11.
Two, high grade silica-calcium alloy ordinary production technology:
1. former material assembly:
1. the compound of lime (230kg) and coke (75kg): 305kg altogether;
2. the compound of silica (260kg) and coke (75kg): 335kg altogether;
3. the compound of silica (260kg) and charcoal (20kg): 280kg altogether;
2. processing step:
After crucible was made, should guarantee that fire box temperature should be between 1900-2300 ℃ this moment.
1. add about lime and coke compound 50kg along three electrode perimeter with the filler shovel, time spent 15-20 minute, fall electrode 20-40mm then, time spent 15-20 minute;
2. add about silica and coke compound 55kg along three electrode perimeter with the filler shovel, time spent 15-20 minute, fall electrode 20-40mm then, time spent 15-20 minute;
3. add about silica and charcoal compound 45kg along three electrode perimeter with the filler shovel, time spent 15-20 minute, fall electrode 20-40mm then, time spent 15-20 minute;
Repeat 1., 2., 3. in the processing step, add all compounds in 4 hours.Open water outlet then, collect liquation.The liquation of this moment is the liquid water of high grade silica-calcium alloy calcic 36%.
Close water outlet, carry out the production of the second stove silicocalcium.
Claims (4)
1. the processing method of a high grade silica-calcium alloy, it uses raw material to be silica, lime, coke, charcoal, it is characterized in that:
The raw material weight proportioning of cultivating the high grade silica-calcium alloy crucible is:
Silica: 56-60%
Lime: 20-24%
Coke: 17-19%
Charcoal: 2-4%
The processing step of cultivating crucible is:
1. add silica bed material 60-80kg,, fire box temperature is risen between 1000-1400 ℃ to the electrodes in mine hot stove energising;
2. add lime and coke compound along three electrode perimeter, add 23-26kg at every turn, added once, and added in 4 hours in every interval 15-20 minute;
3. add silica and coke compound along three electrode perimeter, add 28-32kg at every turn, added once, and added in 4 hours in every interval 15-2 minute;
4. add silica and charcoal compound along three electrode perimeter, add 21-26kg at every turn, added once, and added in 4 hours in every interval 15-20 minute;
Above-mentioned 2., 3., 4. in the processing step, after compound adds each time, promptly slowly fall three electrode 20-40mm, time spent 15-20 minute, and then add compound next time.
5. after three kinds of compounds add, open water outlet, emit the liquation discharging, close water outlet then, crucible was cultivated and was finished this moment.
The raw material weight proportioning of high grade silica-calcium alloy ordinary production is:
Silica: 52-56%
Lime: 20-24%
Coke: 18-22%
Charcoal: 2-5%
The processing step of high grade silica-calcium alloy ordinary production is:
1. after crucible is made, should guarantee that fire box temperature should be between 1900-2300 ℃ this moment, add lime and coke compound 48-51kg along three electrode perimeter this moment, time spent 15-20 minute, falls electrode 20-40mm then, time spent 15-20 minute;
2. add silica and coke compound 52-56kg along three electrode perimeter, time spent 15-20 minute, fall electrode 20-40mm then, time spent 15-20 minute;
3. add silica and charcoal compound 43-45kg along three electrode perimeter, time spent 15-20 minute, fall electrode 20-40mm then, time spent 15-20 minute;
Repeat 1., 2., 3. in the processing step, add all compounds in 4 hours, the liquation in this moment burner hearth is the high grade silica-calcium alloy calcic.
2. the processing method of high grade silica-calcium alloy according to claim 1, it is characterized in that: the lime in the described cultivation crucible processing step and the weight proportion of coke compound are: lime is 68-69%, and coke is 30-32%; The weight proportion of silica and coke compound is: silica is 72-75%, and coke is 24-27%; The weight proportion of silica and charcoal compound is: silica is 88-90%, and charcoal is 9-11%.
3. the processing method of high grade silica-calcium alloy according to claim 1, it is characterized in that: the lime in the described high grade silica-calcium alloy ordinary production processing step and the weight proportion of coke compound are: lime is 75-77%, and coke is 23-25%; The weight proportion of silica and coke compound is: silica is 76～78%, and coke is 23-25%; The weight proportion of silica and charcoal compound is: silica is 92-94%, and charcoal is 6-8%.
4. realize the hot stove in the employed ore deposit of the described high grade silica-calcium alloy of claim 1 for one kind, constitute by burner hearth, body of heater, electrode, electrode lifting device is a mechanical elevating, it is characterized in that: in employed three electrodes of the hot stove in ore deposit, have its secondary phase current of an electrode to be better than other two other, the depth ratio of the close water outlet of this electrode and its insertion burner hearth is two dark 30-50mm of electrode in addition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99110872A CN1086209C (en) | 1999-07-23 | 1999-07-23 | Production method of high-grade silicon-calcium alloy and its ore-smelting electric furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99110872A CN1086209C (en) | 1999-07-23 | 1999-07-23 | Production method of high-grade silicon-calcium alloy and its ore-smelting electric furnace |
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| CN1281905A true CN1281905A (en) | 2001-01-31 |
| CN1086209C CN1086209C (en) | 2002-06-12 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102121069A (en) * | 2010-12-28 | 2011-07-13 | 陕西盛华冶化有限公司 | Raw material of high purity silicon-calcium alloy and production equipment and production process thereof |
| CN109338128A (en) * | 2018-10-31 | 2019-02-15 | 宁夏科通新材料科技有限公司 | A kind of calcium-silicon production technology |
| CN111676370A (en) * | 2020-06-17 | 2020-09-18 | 宁夏科通新材料科技有限公司 | Process for producing high-silicon low-aluminum-silicon-calcium alloy by novel submerged arc furnace |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1118379A (en) * | 1994-09-05 | 1996-03-13 | 甘肃省城市集体经济工商公司 | Melting process and special furnace for high grade silica-calcium alloy |
| CN1106465A (en) * | 1994-11-28 | 1995-08-09 | 西安建筑科技大学 | Method for smelting Si-Ca alloy |
-
1999
- 1999-07-23 CN CN99110872A patent/CN1086209C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102121069A (en) * | 2010-12-28 | 2011-07-13 | 陕西盛华冶化有限公司 | Raw material of high purity silicon-calcium alloy and production equipment and production process thereof |
| CN109338128A (en) * | 2018-10-31 | 2019-02-15 | 宁夏科通新材料科技有限公司 | A kind of calcium-silicon production technology |
| CN111676370A (en) * | 2020-06-17 | 2020-09-18 | 宁夏科通新材料科技有限公司 | Process for producing high-silicon low-aluminum-silicon-calcium alloy by novel submerged arc furnace |
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| Publication number | Publication date |
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| CN1086209C (en) | 2002-06-12 |
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