CN1227270A - Smelting method for silicon-calcium alloy - Google Patents
Smelting method for silicon-calcium alloy Download PDFInfo
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- CN1227270A CN1227270A CN 98100575 CN98100575A CN1227270A CN 1227270 A CN1227270 A CN 1227270A CN 98100575 CN98100575 CN 98100575 CN 98100575 A CN98100575 A CN 98100575A CN 1227270 A CN1227270 A CN 1227270A
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Abstract
The present invention includes the improvement of smelting furnace equipment and the smelting of silicon-calcium alloy. The key of the improvement is the special graphite crucible in the MF electric furnace, which is made of industrial graphite and through the sintering under natural fire, may be used for over 100 times in the high temperature of 1400-2100 deg.C and results in stable prorduct quality, high product output and reduced product cost. The smelting process adopts one step burdening and simultaneous throwing into furnace, and this ensures full reaction, smooth deoxidation, fewer steps and calcium content in the silicon-calcium alloy over 30%.
Description
The invention relates to a smelting method of a calcium-silicon alloy, in particular to a method suitable for smelting the calcium-silicon alloy by using a medium-frequency electric furnace.
At present, the production methods of the silicon-calcium alloy in China have two types: the first method is to produce by an electric arc furnace, and the silicon-calcium alloy produced by the electric arc furnace has high power consumption and unstable product quality; the second method is to use a medium-frequency electric furnace, but the production method and the production technology often have damage to a furnace lining and a crucible, lagged operation and complicated working procedures.
With the development of special steel in the steel industry at present, the silicon-calcium alloy with high quality and stability, the yield meetingthe requirements of users and the cost reduction can be produced by an advanced production technical method, and is eager for alloy production enterprises.
The invention aims to provide a smelting method of silicon-calcium alloy with calcium content of more than 30%, which has stable production quality and reduced cost, and the smelting method comprises equipment improvement of a smelting furnace and a smelting method of silicon-calcium alloy.
The present invention is thus achieved.
The smelting method of the silicon-calcium alloy comprises the working procedures of material preparation, smelting and furnace discharge, and is characterized in that: the raw materials comprise limestone, quartz stone, fluorite, soda ash and coke powder, the proportion (weight percentage) is 60: 30: 6: 1: 3, the raw materials are crushed together and put into a furnace once. A smelting method of a silicon-calcium alloy comprises the following steps:
the smelting method comprises the following steps: 1. selecting raw materials 2, preparing materials 3, smelting 4 and discharging. 1. Raw materials are selected: the raw materials comprise: limestone, quartz stone, fluorite, soda ash and coke powder.
When the five raw materials are selected: the calcium content of limestone should reach more than 94 percent, the silicon content of quartz stone should reach more than 97 percent, and fluorite, soda ash and coke powder have no special requirements.
2. Preparing materials: in units of kilograms, the percentage is taken as a material mixing method, 100 kilograms of raw materials are taken as an example, and the table A-1
| Name (R) | Limestone | Quartz stone | Fluorite (Fluorite) | Soda ash | Coke powder |
| Dosing | |||||
| 100 kg of | 60 | 30 | 6 | 1 | 3 |
Table a-1 ingredient description: 1. after the mixture ratio is finished, putting the mixture into a common stirring type stirrer, and stirring for 1.5 hours for standby. 2. Crushing the stirred raw materials into powder with the granularity of 80-200 meshes by using a common crusher for later use.
3. Smelting: the raw material with the granularity of 80-200 meshes is put into a furnace mouth and is leveled, then the furnace temperature is increased from 800 ℃ for about 0.5 hour to 1200 ℃ for about 0.5 hour and then to 1400 ℃, and the smelting is carried out for 1.5 hours at the furnace temperature of 1400 ℃.
4. Discharging: and (3) putting the silicon-calcium alloy liquid inclined by the medium-frequency electric furnace into a steel die.
The chemical reaction formula in the smelting process is as follows:
secondly, equipment improvement of the smelting furnace:
the improvement of the silicon-calcium alloy smelting equipment is as follows: specially making graphite crucible. The method is that industrial graphite electrode is crushed into 30-100 mesh, mixed with quartz sand and clay in the ratio of 10 to 1, stirred with water, and the stirred material is set inside crucible mold to be tamped and sintered fast with natural fire, demolded and set inside medium frequency electric furnace, and the space between the outer diameter of the special graphite crucible and the inner diameter of the medium frequency electric furnace is filled with refractory earth to be tamped. The service life of the crucible can reach 100-130 heats when being continuously used at the temperature of 1400-2100 ℃, and the heats ensure the stable quality and yield of the silicon-calcium alloy.
The smelting method has the advantages that: all furnace raw materials are stirred and crushed at one time according to an accurate raw material ratio and are fed into the furnace at the same time, so that the full reaction is easy to occur, the deoxidation is smooth, the product quality is stable, unnecessary processes are simplified, and a prediction basis is provided for the product test and inspection after the furnace is taken out. Example (b):
it is required to produce a silico-calcium alloy containing more than 30% of calcium.
Firstly, mixing limestone containing more than 94% of calcium, quartz containing more than 97% of silicon, fluorite, soda ash and coke powder by the weight of 60 kg, 30 kg, 6 kg, 1 kg and 3 kg respectively to obtain 100 kg of raw materials, stirring and crushing the raw materials into 80-200 meshes of powder, putting the powder into an intermediate frequency electric furnace, and sintering the powder at the temperature of 800-1200 ℃ for half an hour, 1200-1400 ℃ for half an hour and 1400 ℃ for 1.5 hours for 2.5 hours in total by adopting a special graphite crucible which is prepared from graphite electric powder, quartz sand and clay in a ratio of 10: 1.
After cooling, the smelted silicon-calcium alloy is analyzed by test, and the calcium content in the silicon-calcium alloy is 34%.
Claims (2)
1. The smelting method of the silicon-calcium alloy comprises the working procedures of material preparation, smelting and furnace discharge, and is characterized in that: the raw materials comprise limestone, quartz stone, fluorite, soda ash and coke powder, the proportion (weight percentage) is 60: 30: 6: 1: 3, the raw materials are crushed together and put into a furnace once.
2. The special graphite crucible material of the medium frequency electric furnace is prepared according to the proportion of 10: 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98100575 CN1060220C (en) | 1998-02-26 | 1998-02-26 | Smelting method for silicon-calcium alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98100575 CN1060220C (en) | 1998-02-26 | 1998-02-26 | Smelting method for silicon-calcium alloy |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1227270A true CN1227270A (en) | 1999-09-01 |
| CN1060220C CN1060220C (en) | 2001-01-03 |
Family
ID=5216107
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98100575 Ceased CN1060220C (en) | 1998-02-26 | 1998-02-26 | Smelting method for silicon-calcium alloy |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1060220C (en) |
Cited By (2)
| 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 |
| CN108588528A (en) * | 2018-04-19 | 2018-09-28 | 陕西科技大学 | A kind of hydrogen manufacturing alloy and preparation method thereof |
-
1998
- 1998-02-26 CN CN 98100575 patent/CN1060220C/en not_active Ceased
Cited By (2)
| 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 |
| CN108588528A (en) * | 2018-04-19 | 2018-09-28 | 陕西科技大学 | A kind of hydrogen manufacturing alloy and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1060220C (en) | 2001-01-03 |
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Decision date of declaring invalidation: 20030219 Decision number of declaring invalidation: 4796 |