CN1049138A - The method of hard coal and quartz sand smelting green silicon carbide - Google Patents
The method of hard coal and quartz sand smelting green silicon carbide Download PDFInfo
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- CN1049138A CN1049138A CN 89105337 CN89105337A CN1049138A CN 1049138 A CN1049138 A CN 1049138A CN 89105337 CN89105337 CN 89105337 CN 89105337 A CN89105337 A CN 89105337A CN 1049138 A CN1049138 A CN 1049138A
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- hard coal
- silicon carbide
- green silicon
- quartz sand
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Abstract
The present invention's hard coal is the method for carbonaceous material and quartz sand smelting green silicon carbide.
Description
The invention belongs to the method field of silicon carbide smelting, especially belong to the method field of hard coal and quartz sand silicon carbide smelting.
Usually the method for smelting green silicon carbide, its carbonaceous material all adopts petroleum coke, is a kind of of many uses by the what petroleum coke, and therefore the industrial chemicals that price is expensive again, greatly develops the production of silicon carbide to what, has been subjected to influence.
Task of the present invention is sought a kind of ample supply and prompt delivery exactly, and cheap carbonaceous material replaces the oil coke to come smelting green silicon carbide.
In order to realize task of the present invention, the inventor utilizes hard coal to replace the petroleum coke smelting green silicon carbide to obtain satisfactory result.
Anthracitic composition of the present invention be carbon content greater than 85%, ash content is less than 3.5%, moisture is less than 4%, volatile matter is less than 3%, sulphur content is greater than 1.25% hard coal.Subsidiary material are sodium-chlor wood chips.The content of sodium-chlor is greater than 97%, and ash content is less than 2%, and moisture is less than 3%, and the composition of wood chip is that volatile matter is not more than 76.8%, and ash content is not more than 6.24%, and fixed carbon is not less than 16.9%.Method of the present invention is to adopt known electric heating process, be exactly silicon-dioxide by the method for carbon reduction silicon carbide smelting, resistance furnace of the present invention is the intermittent type resistance furnace of using always.Uncovered above the resistance furnace, the stove both sides are provided with the furnace wall that can load and unload refractory brick, and two ends are headwalls, Graphite Electrodes is inserted at center at headwall, and the heating element combustion chamber is that Graphite Powder 99 is made, and is connected with two end electrodes, the reaction material of packing into around the combustion chamber is adorned insulation material at a distance from combustion chamber.Further specify the present invention below in conjunction with accompanying drawing:
Fig. 1 is the layout of furnace charge.The 4th, bottom insulation material, the 9th, bottom material, the 7th, furnace core body, the 5th, insulation material, 8 tops material, the 6th, middle part material.The batching at each position is the ratio of carbon to silicon-dioxide in the stove, is called modulus, by shown in the table 1:
The modulus at each position in table 1 stove
| The position | End China ink | The bottom | The middle part | Top | Insulation material |
| Modulus C: SiO | 1.7 | 1.68 | 1.58 | 1.55 | 1.5 |
Method with hard coal and quartz sand smelting green silicon carbide of the present invention comprises following several steps:
A. raw material hard coal and quartz sand difference crushing and screening, get anthracitic granularity for being not more than 2 millimeters, the screening of quartz sand is 6 to 18 orders.
B. respectively hard coal and quartz sand are prepared burden by the modulus at each position in the stove.
C. batch mixing: the required quartz sand of each position modulus in the stove for preparing and hard coal mixing in stirrer respectively, the time of batch mixing is 2 to 3 minutes, will in time unload clean behind the mixing of every position.
D. shove charge: shove charge is undertaken by following order: the shove charge wallboard, and shop fixtures layer wood chip, dress bottom insulation material loads portion's reaction material, the separated material case is installed, and dress middle part reaction material is made furnace core body with Graphite Powder 99, extracts the separated material case, reaction material above the shove charge core body, the portion's of loading onto material, dress top insulation material.
E. electric heating is synthetic, and resistance furnace is switched on behind the charged, switches on and manually lights the carbon monoxide that reaction is emitted in 10 to 30 minutes, the temperature of stove is controlled at 1800 to 2600C, the highest 2600C that is no more than of the temperature at stove center, exospheric temperature are at 1800C, and power-on time is 20 to 22 hours.
F. cool off and take off stove, after stopping power supply, naturally cooling 8 to 12 hours is pulled down the insulation material of upper of furnace body, and water pipe is aimed at carborundum crystals and watered, and waters to sidepiece or furnace bottom and drips, and moves to another place whole stove that waters again and waters the 3-4 place and get final product.
G. come out of the stove and classification, after stove cools off fully, take out carborundum crystals and furnace core body graphite block, get carborundum crystals analysis, classify by the State Standard of the People's Republic of China.
Enumerate the embodiment of a hard coal and quartz sand smelting green silicon carbide below, lift a comparison example with petroleum coke and quartz sand smelting green silicon carbide.
Embodiment
7230 kilograms of 6 to the 8 purpose quartz sands of claim pulverizing claim to pulverize granularity less than 4922 kilograms in 2 millimeters hard coal.The materials at each position are provided by table 2 in the stove:
Table 2 each position materials in hard coal and the quartz sand smelting green silicon carbide stove
| The raw material position | The hard coal kilogram | The quartz sand kilogram | The wood chip kilogram | The salt kilogram |
| The bottom | 1065 | 1662 | 180 | 200 |
| The middle part | 3107 | 4503 | 680 | 680 |
| Top | 750 | 1065 | 120 | 110 |
| Add up to | 4922 | 7230 | 980 | 990 |
The hard coal that each position is weighed up by table 2 quantity, quartz sand, wood chip, salt mix respectively, carry out shove charge by the method for introducing previously.Electric heating is synthetic, and stove is taken off in cooling, and all steps of the classification of coming out of the stove are carried out, and obtains 3250 kilograms of green silicon carbides, wherein meets 2275 kilograms in the first grade silicon carbide of People's Republic of China's GB, 975 kilograms of seconds green silicon carbides.
Comparative Examples:
Claim to pulverize 7054 kilograms of 6 to 8 purpose quartz sands, claim to pulverize granularity less than 4752 kilograms of 1.5 millimeters petroleum cokes, the materials at each position are provided by table 3 in the stove:
Table 3 each position materials in petroleum coke and the quartz sand smelting green silicon carbide stove
| The raw material position | The petroleum coke kilogram | The quartz sand kilogram | The wood chip kilogram | The salt kilogram |
| The bottom | 1026 | 1623 | 180 | 190 |
| The middle part | 3001 | 4393 | 680 | 660 |
| Top | 725 | 1038 | 120 | 110 |
| Add up to | 4725 | 7054 | 980 | 960 |
Respectively the petroleum coke, quartz sand, wood chip, the salt that weigh up by table 3 quantity at each position are mixed, carrying out the synthetic cooling of shove charge electric heating by the method for introducing previously takes off the stove all steps of classification of coming out of the stove and obtains 3100 kilograms of green silicon carbides, the first grade that wherein meets People's Republic of China's GB is 2170 kilograms, and seconds is 930 kilograms.
The working parameter contrast table of table 4 hard coal and petroleum coke smelting green silicon carbide:
| Project material class | Input amount (kilogram) | Quartz sand (kilogram) | Send electric power (kilowatt) | Electric power feeding time (hour) | Total consumption (degree) | Silicon carbide output (kilogram) | The rank ratio | |
| One-level | Secondary | |||||||
| Refinery coke | 4752 | 7054 | 1600－ 1620 | 19－20 | 30800 | 3100 | 70 | 30 |
| Hard coal | 4922 | 7230 | 1560－ 1600 | 20－21 | 32000 | 3250 | 70 | 30 |
By top embodiment, as can be seen, can replace the oil coke to do the carbonaceous material of smelting green silicon carbide with hard coal, the hard coal abundant raw material, cheap.Under square one, increase output 3-5%, reduce production costs 10%.Have tangible economic benefit and social benefit.
Claims (2)
1, a kind of siliceous material of quartz sand, the raw material of the smelting green silicon carbide that the subsidiary material of wood chip, salt and carbonaceous material are formed, by fragmentation, screening, batching, batch mixing, shove charge, electric heating are synthetic, black furnace is taken off stove, the method for all step smelting green silicon carbides of the classification of coming out of the stove, it is characterized in that carbonaceous material is a hard coal.
2, the method for smelting green silicon carbide according to claim 1, it is characterized in that said carbonaceous material hard coal be consist of carbon content greater than 85% ash content less than 3.5% moisture less than 4%, volatile matter is less than 3%, sulphur content is less than 1.25% hard coal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89105337 CN1049138A (en) | 1989-08-02 | 1989-08-02 | The method of hard coal and quartz sand smelting green silicon carbide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89105337 CN1049138A (en) | 1989-08-02 | 1989-08-02 | The method of hard coal and quartz sand smelting green silicon carbide |
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| Publication Number | Publication Date |
|---|---|
| CN1049138A true CN1049138A (en) | 1991-02-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 89105337 Pending CN1049138A (en) | 1989-08-02 | 1989-08-02 | The method of hard coal and quartz sand smelting green silicon carbide |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101254912B (en) * | 2008-04-07 | 2011-03-16 | 河南醒狮高新技术股份有限公司 | Carbon-based materials for in-situ synthesis of high-pure green 6H-SiC |
| CN102351181A (en) * | 2011-06-30 | 2012-02-15 | 神华集团有限责任公司 | Method for melting green silicon carbide from smokeless ultra low-ash pure coal and green silicon carbide prepared therefrom |
| CN101343062B (en) * | 2007-07-13 | 2012-02-29 | 贾玉东 | Method for smelting green silicon carbide abrasive material |
| CN102633260A (en) * | 2012-03-15 | 2012-08-15 | 新疆豫丰光伏材料科技有限公司 | Silicon carbide synthesis method |
| CN107697918A (en) * | 2017-03-22 | 2018-02-16 | 常州润达铁合金有限公司 | A kind of low aluminium silicon carbide and preparation method thereof |
-
1989
- 1989-08-02 CN CN 89105337 patent/CN1049138A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101343062B (en) * | 2007-07-13 | 2012-02-29 | 贾玉东 | Method for smelting green silicon carbide abrasive material |
| CN101254912B (en) * | 2008-04-07 | 2011-03-16 | 河南醒狮高新技术股份有限公司 | Carbon-based materials for in-situ synthesis of high-pure green 6H-SiC |
| CN102351181A (en) * | 2011-06-30 | 2012-02-15 | 神华集团有限责任公司 | Method for melting green silicon carbide from smokeless ultra low-ash pure coal and green silicon carbide prepared therefrom |
| CN102633260A (en) * | 2012-03-15 | 2012-08-15 | 新疆豫丰光伏材料科技有限公司 | Silicon carbide synthesis method |
| CN102633260B (en) * | 2012-03-15 | 2014-01-08 | 新疆益丰西部陶瓷材料科技有限公司 | Silicon carbide synthesis method |
| CN107697918A (en) * | 2017-03-22 | 2018-02-16 | 常州润达铁合金有限公司 | A kind of low aluminium silicon carbide and preparation method thereof |
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