CN1676630A - Method for smelting ferro-silicon-aluminium alloy using flyash - Google Patents
Method for smelting ferro-silicon-aluminium alloy using flyash Download PDFInfo
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- CN1676630A CN1676630A CN 200510017519 CN200510017519A CN1676630A CN 1676630 A CN1676630 A CN 1676630A CN 200510017519 CN200510017519 CN 200510017519 CN 200510017519 A CN200510017519 A CN 200510017519A CN 1676630 A CN1676630 A CN 1676630A
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Abstract
This invention is a method that uses coal powder to melt ferro-silicon-aluminium, and the characteristics are: take the coal powder balls 28-32 shares that are pressed after the mixing of coal powder and clay powder according to the weight percentages, the crushed alnico 68-72 shares, the crushed silica 125-139 shares, the coke 98-106 shares, the steel bits 10-12 shares and put them into the melting furnace, and cool them after out of the furnace to get the finished products. The strong points of this invention are: the coal powder of the raw materials is up to 28-32%, which provides a brand space for the comprehensive utilization of cola powder, add the additive =<0.5% during the balling and melting procedure to lower the stickiness of the melting liquid and promote the reaction to the positive direction, and meanwhile prevent the felt phenomenon of the materials, and change the traditional method. The performance of the products is improved, and it avoid the weak points of high cost. The raw materials of this invention are abundant and their prices are low.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a method for smelting an aluminum-silicon-iron alloy by utilizing fly ash. The Al-Si-Fe alloy is used as desulfurizing agent, deoxidant and magnesium reducing agent for smelting steel.
Background
With the rapid development of the power industry, the emission of the fly ash is increased day by day, which becomes a social big problem of environmental pollution and restriction on economic development. Therefore, the strengthening of environmental governance and the comprehensive utilization of the fly ash have attracted great attention from all social circles. At present, the fly ash is mainly used for producing masonry cement, mixed materials, paving, aerated blocks, standard bricks and the like, but the total utilization amount is still small, and the added value is small.
In order to further improve the utilization amount of the fly ash and the additional value of the fly ash, some scientific research units and manufacturers in China propose smelting of the ferro-silicon-aluminum alloy by using the fly ash according to the theoretical basis that the components of the fly ash are similar to those of the ferro-silicon-aluminum alloy, and are subjected to research experiments. However, until now, no report on the success has been found.
Disclosure of Invention
The invention aims to provide a method for smelting an Al-Si-Fe alloy by using fly ash aiming at the problems in the prior art. The technological process can utilize the flyash from coal burning boiler comprehensively to reduce environmental pollution, optimize the performance of ferro-silicon-aluminum product and raise the added value.
The object of the invention can be achieved by the following technical measures:
the method for smelting the ferro-silicon-aluminum alloy by using the fly ash comprises the following steps: 28-32 parts of pulverized fuel ash pellets, 68-72 parts of pulverized bauxite, 125-139 parts of pulverized silica, 98-106 parts of coke and 10-12 parts of steel scraps, which are formed by rolling and stirring pulverized fuel ash and clay powder in parts by weight, are put into a smelting furnace for smelting, and the finished product is obtained after discharging and cooling.
The fly ash pellet is prepared from the following raw materials in percentage by weight, 79-84% of fly ash and 16-21% of clay powder are mixed and stirred in proportion and then rolled into a sphere with the strength of 0.4-0.6 MPa.
The fly ash pellet index requirements in the invention are as follows:
① mixing the fly ash and clay powder, rolling and shaping by a high-pressure double-roll hydraulic ball rolling machine to obtain the shape of 24mm x 34mm x 10mm apricot kernel.
② the pelletizing strength of the fly ash pellets is 0.4-0.6 MPa.
③ the pellets of powdered coal ash should be pre-dried before being put into the furnace, and the water content is controlled at 1-2%.
④ the crushed materials should be controlled between 2-5% in the pelletizing of the fly ash pellets.
The particle sizes of the bauxite and the silica are both 30-35 mm.
Fluorite with the weight ratio less than 0.5 percent is also added into the components.
The invention comprises the following raw materials:
① requirement of fly ash for Al2O321-30％，SiO247-55％，Fe2O32-7％，CaO＜8％；
② Clay powder requires Fe2O3＞1.5％、TiO2＜0.95％、Al2O3＞40％；
③ bauxite requires Al2O3＞68％，Fe2O3Less than 4 percent and other comprehensive components not more than 15 percent;
④ silica SiO2More than 96 percent, and other comprehensive components are not more than 4 percent;
⑤ Fluorite CaF2More than 85 percent, and other comprehensive components not more than 15 percent; the fluorite is used in a very small amount, and the amount is not more than the total weight0.5 percent of the weight ratio (namely the total weight of the fly ash pellets, the bauxite, the silica, the coke and the steel scraps) is used for adjusting the furnace condition, and the fly ash pellets, the bauxite, the silica, the coke and the steel scraps can be added at any time when the viscosity of a melting material is high in the smelting process.
⑥ Coke requires moisture WPLess than 0.5 percent and ash APLess than 6 percent of volatile component VPGreater than 9% and fixed carbon content CP＞75％；
The invention has the following advantages:
(1) the doping amount of the fly ash in the raw materials can reach 28-32%, and a wider space is provided for the comprehensive utilization of the fly ash.
(2) The addition of the additive (fluorite) not more than 0.5 percent (total weight ratio) in the process of ball making and smelting greatly reduces the viscosity of the molten liquid in the smelting furnace, well promotes the forward direction of the reaction and simultaneously prevents the occurrence of the bonding phenomenon of furnace materials.
(3) The traditional metal remill by the aluminum mixing method is changed, the product performance is improved, and the disadvantages and shortcomings of high cost are avoided.
The product of the invention is mainly used as a steel-making desulfurizer, a deoxidizer and a reducing agent for magnesium smelting, and has strong reducing capability and high utilization efficiency. The method of the invention is to reduce AL simultaneously by carbon2O3、SiO2、Fe2O3The obtained aluminum-silicon alloy product has the advantages of rich raw material resources, low price, low production cost, small investment, quick response and obvious economic benefit, and simultaneously, the technology utilizes a large amount of fly ash, so the social and environmental benefits are considerable.
Detailed Description
The present invention will be described in further detail with reference to examples, but the present invention is not limited thereto.
Example 1:
this example was used to produce the national standard 25# sendust (AL 26%, Si 62%, Fe 11%).
The fly ash pellets in the embodiment are prepared from the following raw materials in percentage by weight, 83% of fly ash and 17% of clay powder are mixed and stirred in proportion, and then are rolled and molded by a high-pressure double-roll hydraulic ball rolling machine, wherein the shape of the fly ash pellets is an apricot kernel shape with the size of 24mm multiplied by 34mm multiplied by 10mm, the strength of the fly ash pellets is 0.5MPa, and the water content of the fly ash pellets is 1.5%.
30Kg of fly ash pellets, 70Kg of bauxite with the granularity of 30mm after being crushed, 137.42Kg of silica with the granularity of 32mm after being crushed, 104.82Kg of coke, 11.55Kg of steel scrap and 1.3Kg of fluorite are put into a smelting furnace for smelting according to the weight proportion ratio, and the finished product is obtained after the materials are taken out of the furnace and cooled.
The analysis of the raw materials in this example is as follows:
①, the chemical components of the fly ash are as follows:
| component (A) | Al2O3 | SiO2 | Fe2O3 | CaO | MgO | L (loss on ignition) | Total up to |
| Content (%) | 28.51 | 50.28 | 5.31 | 6.56 | 0.9 9 | 7.12 | 98.77 |
②, the components of the clay powder are as follows:
| component (A) | Al2O3 | SiO2 | Fe2O3 | CaO | K2O | L (loss on ignition) |
| Content (%) | 44.60 | 34.77 | 1.63 | 0.40 | 0.15 | 14.74 |
③, bauxite and silica chemistry:
| Al2O3 | SiO2 | Fe2O3 | CaO | MgO | |
| bauxite | 69.26 | 10.21 | 3.2 | 1.0 | 0.43 |
| Silica | 0.8 | 98.3 | 0.5 |
④, 80 percent of coke fixed carbon
⑤, the Fe content of the steel scrap is 90 percent
The proportion of each raw material is calculated asfollows:
al in fly ash pellet2O3The contents are as follows:
30×83％×28.51％+30×17％×44.60％＝9.37Kg
SiO2the contents are as follows:
30×83％×50.28％+30×17％×34.77％＝14.29Kg
Fe2O3the contents are as follows:
30×83％×5.31％+30×17％×1.63％＝1.41Kg
al in bauxite2O3The content is as follows: 70X 69.26% ═ 48.48Kg
SiO2The content is as follows: 70X 10.21 percent to 7.15Kg
Fe2O3The content is as follows: 70X 3.2 percent to 2.24Kg
Then in 100Kg of material (fly ash pellets + bauxite)
Al2O3The contents are as follows: 57.85Kg of 9.37+48.48
SiO2The contents are as follows: 14.29+ 7.15-21.44 Kg
Fe2O3The contents are as follows: 3.65Kg for 1.41+2.24
Al content: 57.85X 54/102-30.63 Kg
Si content: 21.44X 28/60 Kg 10.00Kg
Fe content: 3.65X 112/160 ═ 2.56Kg
The amount of silica added was:
(30.63×62÷26-10)×60÷28÷98.3％＝137.42Kg
the amount of steel scraps required to be added is as follows:
(30.63×11÷26-2.56)÷90％＝11.55Kg
the required coke amount was calculated as follows:
3654
x130.63Kg
then Al is reduced2O3The coke-required amount is: x is the number of1＝30.63×36÷54÷0.8＝25.53Kg
24 28
x230.63×62÷26
Reduction of SiO2The coke-required amount is:
x2＝24×30.63×62÷26÷28÷0.8＝78.26Kg
36 112
x32.56Kg
reduction of Fe2O3The coke demand is as follows: x is the number of3＝36×2.56÷112÷0.8＝1.03Kg
The total amount of coke required is: x is the number of1+x2+x3＝104.82Kg
Example 2:
this example was used to produce the national standard 25# sendust (AL 28%, Si 61%, Fe 11%).
The fly ash pellets in the embodiment are prepared from the following raw materials in percentage by weight, 83% of fly ash and 17% of clay powder are mixed and stirred in proportion, and then are rolled and molded by a high-pressure double-roller hydraulic ball rolling machine, wherein the shape of the fly ash pellets is an apricot kernel shape with the size of 24mm multiplied by 34mm multiplied by 10mm, the strength of the fly ash pellets is 0.55MPa, and the water content of the fly ash pellets is 1.5%.
Taking 29Kg of fly ash pellets, 71Kg of bauxite with the granularity of 30mm after being crushed, 125.03Kg of silica with the granularity of 32mm after being crushed, 98.67Kg of coke and 10.64Kg of steel scrap according to the weight proportion ratio, putting the mixture into a smelting furnace for smelting, and taking the mixture out of the furnace and cooling the mixture to obtain a finished product.
The analysis of the raw materials in this example is as follows:
①, the chemical components of the fly ash are as follows:
| become intoPortions are | Al2O3 | SiO2 | Fe2O 3 | CaO | MgO | L (loss on ignition) | Total up to |
| Content (%) | 28.51 | 50.28 | 5.31 | 6.56 | 0.99 | 7.12 | 98.7 7 |
②, the components of the clay powder are as follows:
| component (A) | Al2O3 | SiO2 | Fe2O3 | CaO | K2O | L (loss on ignition) |
| Content (%) | 44.60 | 34.77 | 1.63 | 0.40 | 0.15 | 14.74 |
③, bauxite and silica chemistry:
| Al2O3 | SiO2 | Fe2O3 | CaO | MgO | |
| bauxite | 69.26 | 10.21 | 3.2 | 1.0 | 0.43 |
| Silica | 0.8 | 98.3 | 0.5 |
④, 80 percent of coke fixed carbon
⑤, the Fe content of the steel scrap is 90 percent
The proportion of each raw material is calculated as follows:
al in fly ash pellet2O3The contents are as follows:
29×83％×28.51％+29×17％×44.60％＝9.06Kg
SiO2the contents are as follows:
29×83％×50.28％+29×17％×34.77％＝13.81Kg
Fe2O3the contents are as follows:
29×83％×5.31％+29×17％×1.63％＝1.36Kg
al in bauxite2O3The content is as follows: 71X 69.26% ═ 49.17Kg
SiO2The content is as follows: 71X 10.21 percent to 7.25Kg
Fe2O3The content is as follows: 71X 3.2 percent to 2.27Kg
Then in 100Kg of the material (fly ash pellets + bauxite)
Al2O3The contents are as follows: 58.23Kg for 9.06+49.17
SiO2The contents are as follows: 13.81+7.25 ═ 21.06Kg
Fe2O3The contents are as follows: 3.63Kg for 1.36+2.27
Al content: 58.23 × 54 ÷ 102 ═ 30.83Kg
Si content: 21.06 × 28 ÷ 60 ═ 9.83Kg
Fe content: 3.63X 112/160 ═ 2.54Kg
The amount of silica added was:
(30.83×61÷28-9.83)×60÷28÷98.3％＝125.03Kg
the amount of steel scraps required to be added is as follows:
(30.83×11÷28-2.54)÷90％＝10.64Kg
the required coke amount was calculated as follows:
36 54
x130.83Kg
then Al is reduced2O3The coke demand is as follows: x is the number of1＝30.83×36÷54÷0.8＝25.69Kg
24 28
x230.83×61÷28
Reduction of SiO2The coke demand is as follows:
x2＝24×30.83×61÷28÷28÷0.8＝71.96Kg
36 112
x32.54Kg
reduction of Fe2O3The coke demand is as follows: x is the number of3＝36×2.54÷112÷0.8＝1.02Kg
The total amount of coke required is: x is the number of1+x2+x3＝98.67Kg
The chemical compositions of 25# sendust alloy produced according to the method of the present invention and meeting the national standard are as follows:
Claims (4)
1. a method for smelting an aluminum silicon iron alloy by utilizing fly ash is characterized by comprising the following steps: 28-32 parts of pulverized fuel ash pellets, 68-72 parts of pulverized bauxite, 125-139 parts of pulverized silica, 98-106 parts of coke and 10-12 parts of steel scraps, which are formed by rolling pulverized fuel ash and clay powder after mixing and stirring, are put into a smelting furnace for smelting, and the finished product is obtained after discharging and cooling.
2. The method for smelting the alundum alloy by using the fly ash as claimed in claim 1, wherein the method comprises the following steps: the fly ash pellet is prepared from 79-84% of fly ash and 16-21% of clay powder by weight ratio, and is rolled into a sphere with the strength of 0.4-0.6MPa after being mixed and stirred in proportion.
3. The method for smelting the alundum alloy by using the fly ash as claimed in claim1, wherein the method comprises the following steps: the particle sizes of the bauxite and the silica are both 30-35 mm.
4. The method for smelting the alundum alloy by using the fly ash as claimed in claim 1, wherein the method comprises the following steps: fluorite which accounts for less than 0.5 percent of the total weight is added into the components.
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| CNB2005100175191A CN1316046C (en) | 2005-04-18 | 2005-04-18 | Method for smelting ferro-silicon-aluminium alloy using flyash |
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| CNB2005100175191A CN1316046C (en) | 2005-04-18 | 2005-04-18 | Method for smelting ferro-silicon-aluminium alloy using flyash |
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| CN1316046C CN1316046C (en) | 2007-05-16 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101469378B (en) * | 2007-12-24 | 2010-12-15 | 同方环境股份有限公司 | Method for preparing alsifer from high-alumina fly ash and magnetic beads |
| CN101020960B (en) * | 2007-03-12 | 2011-04-27 | 无锡雪浪输送机械有限公司 | Pellet for smelting Al-Si alloy and its preparation method |
| CN102826776A (en) * | 2012-08-02 | 2012-12-19 | 亿利资源集团有限公司 | Method for simultaneously extracting glass microbeads from fly ash and coproducing aluminum-silicon-iron alloy and white carbon black |
| CN109536727A (en) * | 2019-01-18 | 2019-03-29 | 东北大学 | A method of ferrosilicon aluminium is prepared with flyash carbon thermal reduction |
| CN111167831A (en) * | 2020-01-03 | 2020-05-19 | 武翠莲 | Method for catalytically decomposing aluminosilicate |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1167814C (en) * | 1999-02-12 | 2004-09-22 | 吴赞贤 | Rare earth composite deoxidation material and its technological process |
-
2005
- 2005-04-18 CN CNB2005100175191A patent/CN1316046C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101020960B (en) * | 2007-03-12 | 2011-04-27 | 无锡雪浪输送机械有限公司 | Pellet for smelting Al-Si alloy and its preparation method |
| CN101469378B (en) * | 2007-12-24 | 2010-12-15 | 同方环境股份有限公司 | Method for preparing alsifer from high-alumina fly ash and magnetic beads |
| CN102826776A (en) * | 2012-08-02 | 2012-12-19 | 亿利资源集团有限公司 | Method for simultaneously extracting glass microbeads from fly ash and coproducing aluminum-silicon-iron alloy and white carbon black |
| CN102826776B (en) * | 2012-08-02 | 2014-07-09 | 亿利资源集团有限公司 | Method for simultaneously extracting glass microbeads from fly ash and coproducing aluminum-silicon-iron alloy and white carbon black |
| CN109536727A (en) * | 2019-01-18 | 2019-03-29 | 东北大学 | A method of ferrosilicon aluminium is prepared with flyash carbon thermal reduction |
| CN109536727B (en) * | 2019-01-18 | 2020-05-22 | 东北大学 | Method for preparing silicon-iron-aluminum alloy by using coal ash carbon thermal reduction |
| CN111167831A (en) * | 2020-01-03 | 2020-05-19 | 武翠莲 | Method for catalytically decomposing aluminosilicate |
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Effective date of registration: 20090403 Address after: Yangcheng District, Henan City, Dengfeng province area list Patentee after: Aluminium Alloy Co., Ltd., of Dengfeng Power Plant Group Address before: Yangcheng District, Henan City, Dengfeng province area list Patentee before: Dengfeng Power Plant Group Co., Ltd. |
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Granted publication date: 20070516 Termination date: 20120418 |