CN104099469A - Resource utilization method of waste magnesia powder after treating oriented silicon steel - Google Patents
Resource utilization method of waste magnesia powder after treating oriented silicon steel Download PDFInfo
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- CN104099469A CN104099469A CN201410298531.3A CN201410298531A CN104099469A CN 104099469 A CN104099469 A CN 104099469A CN 201410298531 A CN201410298531 A CN 201410298531A CN 104099469 A CN104099469 A CN 104099469A
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Abstract
The invention discloses a resource utilization method of waste magnesia powder after treating oriented silicon steel. The resource utilization method comprises the following steps: (1) the waste magnesia powder after treating the oriented silicon steel is collected, and is evenly mixed with carbon powder and asphalt powder to obtain a mixed raw material by the following weight percentages: the waste magnesia powder is 60-95%, the carbon powder is 0-30%, and the asphalt powder is 5-10%; (2) the mixed raw material is prepared to green pellets with the diameter of 10-15 mm; and then the temperature of the green pellets is kept at 190-210 DEG C for 0.8-1.2 hours to prepare magnesium carbon pellets; and (3) the cooled magnesium carbon pellets are used as a slag splashing furnace protecting material. The resource utilization method uses the waste magnesia powder after treating the oriented silicon steel to replace the magnesium carbon pellets for the slag splashing furnace protection of a caustic-burned magnesia powder production converter; and the magnesium carbon pellets have high mechanical strength, can effectively enhance the viscosity of furnace slag, and can improve the slag splashing effect, so that the waste magnesia powder is effectively used, the stacking place is saved, the groundwater pollution is prevented, and the dual effects of environmental protection and economy are achieved.
Description
Technical field
The present invention relates to solid waste resource recovery technology, refer to particularly the resource utilization method of discarding magnesia powder after a kind of oriented silicon steel thermal treatment.
Background technology
In oriented silicon steel production process, need coat on silicon strip surface excessive silicon steel level magnesium oxide and carry out second annealing with a small amount of other additives, after this thermal treatment, only there is the element silicon in part silicon steel level magnesium oxide and oriented silicon steel react and be retained in silicon strip surface, form Magnesium Silicate q-agent bottom, and all the other unreacted magnesium oxide come off from silicon strip surface in steel band uncoiling process, and be collected in hopper by sack cleaner, the magnesium oxide powder that collection obtains is owing to losing original high reaction activity in heat-processed, cannot again be back to silicon steel produces, can only be stacked at slag field as solid waste at present, properly utilized, occupied ground and contaminate environment.Silicon steel level magnesium oxide, only for the production of oriented silicon steel, has no in document specially and reports for the research of discarded magnesia powder after oriented silicon steel thermal treatment.
Slag splashing is the important technology that improves life of converter, before slag splashing operation, need to use slag splashing furnace protecting material to carry out modification to converter finishing slag, when improving content of magnesia in slag, reduce the content of iron protoxide, make slag there is suitable viscosity and refractoriness, be easy to combine with furnace lining form and spatter slag blanket and possess certain corrosion resistance.
Summary of the invention
Object of the present invention is exactly that the resource utilization method of discarding magnesia powder after a kind of oriented silicon steel thermal treatment will be provided, and realizes the recycling of this discarded magnesia powder, and solves accumulation occupation of land and problem of environmental pollution.
For achieving the above object, the technical solution used in the present invention is: the resource utilization method of discarded magnesia powder after a kind of oriented silicon steel thermal treatment, comprises the following steps:
1) discarded magnesia powder after the thermal treatment of collection oriented silicon steel, by this discarded magnesia powder and carbon dust, and asphalt powder mixes by following weight proportion: discarded magnesia powder, 60～95%; Carbon dust, 0～30%; Asphalt powder, 5～10%, obtain mixing raw material;
2) described mixing raw material being caused to diameter is the green pellets of 10～15mm, then described green pellets is incubated to 0.8～1.2 hour at 190～210 ℃, makes magnesium carbon ball, takes out and naturally cools to room temperature;
3) described cooled magnesium carbon ball is used as to slag splashing furnace protecting material.
Further, described step 3) in, the dosage of described magnesium carbon ball is 10～15% of slag weight.
Further, described step 1) in, in described discarded magnesia powder, composition weight content is characterized as: MgO>=90%, TiO
2≤ 10%, SiO
2≤ 2%, Al
2o
3≤ 2%, TFe≤1%, other impurity≤1%, igloss amount≤1%; The granularity of described discarded magnesia powder is D50≤20 μ m.
Further, described step 1) in, will discard magnesia powder and carbon dust, and asphalt powder adds and in mixer, mixes 5～8min by described proportioning.
Further, described step 2) in, described mixing raw material to be sent in pelletizer and added water pelletizing group, amount of water is 5～10% of described mixing raw material weight.
Further, described step 2) in, described green pellets is incubated 1～1.2 hour at 195～200 ℃, makes ripe pelletizing.
Further, described step 1) in, described carbon dust is breeze, coal dust, or the combination of one or more arbitrary proportions in Graphite Powder 99.
Compared with prior art, the present invention has the following advantages:
One, composition and the granularity feature of the present invention's discarded magnesia powder from oriented silicon steel thermal treatment, use this discarded magnesia powder to replace light-burning magnesium powder to produce magnesium carbon ball for splashing slag in converter, this magnesium carbon ball physical strength is high, can effectively improve slag viscosity, improve and spatter slag effect, thereby after making oriented silicon steel thermal treatment, useless magnesia powder is utilized effectively, also saved slag field and stacked land used, to discard magnesia powder tap density 0.6t/m simultaneously
3, year discarded amount 10000t, on average piles high 3m and calculates, and can save every year approximately 0.6 mu of land used.
They are two years old, magnesium oxide water soluble, permeate the ground local water body hardness is caused to disadvantageous effect, the present invention has avoided discarded magnesium oxide polluted underground water source, recycling to this discarded magnesia powder, can create every year approximately 4,000,000 yuan of pure economic benefits, therefore, the present invention has obvious environmental protection and economic worth double effect.
Its three, this discarded magnesia powder itself has superfine granularity, without ball milling processing, can participate in batch mixing directly, magnesium carbon ball pelletizing method is simple, practical, effectively, the magnesium carbon ball of preparation, result of use is good, with low cost.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, be convenient to more clearly understand the present invention, but they do not form restriction to the present invention.
Embodiment 1:
Discarded magnesia powder after the thermal treatment of on-site collection oriented silicon steel, carries out known this discarded magnesium oxide meal component of chemical composition analysis and content (massfraction) as follows: MgO, 92.3%; TiO
2, 3.2%; SiO
2, 1.6%; Al
2o
3, 1.5%; TFe0.3%, other impurity 0.8%, the granularity D50 that measures this discarded magnesia powder by laser particle size analyzer is 18.6 μ m; Then by this discarded magnesia powder and carbon dust, and asphalt powder 60～95%:0～30%:5～10% by weight ratio, preferred weight proportioning 70%:25%:5% adds in horizontal ribbon mixer and mixes 5～8min, preferably mix 8min, mix rear discharging, obtain mixing raw material, wherein, carbon dust in raw material can be breeze, coal dust, or the combination of one or more arbitrary proportions in Graphite Powder 99, and what in this example, select is coal dust;
Above-mentioned mixing raw material is sent into balling disc and add water to cause diameter be the green pellets of 10～15mm, amount of water is 5～10% of described mixing raw material weight, preferably 10%; Then green pellets is sent in roaster in 190～210 ℃, preferably at 200 ℃, be incubated 0.8～1.2 hour, be preferably incubated 1 hour, make magnesium carbon ball, after taking-up, naturally cool to room temperature;
Described cooled magnesium carbon ball as slag splashing furnace protecting material, is carried out to slag splashing operation with normal running station to being blown into high pressure nitrogen in stove, and the dosage of magnesium carbon ball is 10～15% of slag weight, and preferably dosage is 15%.
Empirical tests, this magnesium carbon ball can effectively increase slag oxidation Mg content and fall low FeO content, spatters slag and finishes rear inspection furnace lining situation, and slag dross is respond well, the results detailed in following table 3.
Embodiment 2:
Discarded magnesia powder after the thermal treatment of on-site collection oriented silicon steel, carries out known this discarded magnesium oxide meal component of chemical composition analysis and content (massfraction) as follows: MgO, 94.3%; TiO
2, 2.3%; SiO
2, 1.2%; Al
2o
3, 0.9%; TFe0.3%, other impurity 0.7%, the granularity D50 that measures this discarded magnesia powder by laser particle size analyzer is 17.4 μ m; Then by this discarded magnesia powder and breeze, and asphalt powder by weight ratio 60%:30%:10% add in horizontal ribbon mixer and mix 5～8min, mix rear discharging, obtain mixing raw material;
Above-mentioned mixing raw material is sent into balling disc and add water to cause diameter be the green pellets of 10～15mm, amount of water is 5% of described mixing raw material weight; Then green pellets is sent in roaster and be incubated 1 hour at 200 ℃, make magnesium carbon ball, after taking-up, naturally cool to room temperature;
Described cooled magnesium carbon ball as slag splashing furnace protecting material, is carried out to slag splashing operation with normal running station to being blown into high pressure nitrogen in stove, and the dosage of magnesium carbon ball is 10% of slag weight.
Empirical tests, this magnesium carbon ball can effectively increase slag oxidation Mg content and fall low FeO content, spatters slag and finishes rear inspection furnace lining situation, and slag dross is respond well.
Embodiment 3:
Discarded magnesia powder after the thermal treatment of on-site collection oriented silicon steel, carries out known this discarded magnesium oxide meal component of chemical composition analysis and content (massfraction) as follows: MgO, 90.7%; TiO
2, 5.1%; SiO
2, 1.9%; Al
2o
3, 1.2%; TFe0.4%, other impurity 0.7%, the granularity D50 that measures this discarded magnesia powder by laser particle size analyzer is 17.7 μ m; Then by this discarded magnesia powder and graphite, and asphalt powder by weight ratio 80%:15%:5% add in horizontal ribbon mixer and mix 5～8min, mix rear discharging, obtain mixing raw material;
Above-mentioned mixing raw material is sent into balling disc and add water to cause diameter be the green pellets of 10～15mm, amount of water is 8% of described mixing raw material weight; Then green pellets is sent in roaster and be incubated 1 hour at 200 ℃, make magnesium carbon ball, after taking-up, naturally cool to room temperature;
Described cooled magnesium carbon ball as slag splashing furnace protecting material, is carried out to slag splashing operation with normal running station to being blown into high pressure nitrogen in stove, and the dosage of magnesium carbon ball is 12% of slag weight.
Empirical tests, this magnesium carbon ball can effectively increase slag oxidation Mg content and fall low FeO content, spatters slag and finishes rear inspection furnace lining situation, and slag dross is respond well.
1) magnesium carbon ball embodiment 1～3 being made carries out chemical composition analysis (weight percentage), and result is as following table 1:
| Embodiment | MgO％ | C％ | SiO 2％ | S％ | Granularity |
| Embodiment 1 | 64.2 | 28.3 | 1.1 | ≤0.02 | 10～15mm |
| Embodiment 2 | 56.1 | 38.5 | 0.72 | ≤0.02 | 10～15mm |
| Embodiment 3 | 72.4 | 19.6 | 1.5 | ≤0.02 | 10～15mm |
Table 1
Table 1 result shows, take to discard its chemical composition of magnesium carbon ball that magnesia powder prepared as raw material and meet slag splashing job requirements.
2) magnesium carbon ball embodiment 1～3 being made carries out shatter test and compressive strength test, and 10, each sample thief ball is tested, and averages, and result is as following table 2:
| Embodiment | Dropping strength (inferior 0.5m -1) | (N of ultimate compression strength -1) |
| Embodiment 1 | 4.8 | 5.3 |
| Embodiment 2 | 6.2 | 7.1 |
| Embodiment 3 | 5.6 | 6.5 |
Table 2
Table 2 result shows, the magnesium carbon ball physical strength that embodiment 1～3 makes is high, is enough to resist the impact of jolting in transportation.
3) magnesium carbon ball embodiment 1 being made is as slag splashing furnace protecting material, bessemer furnace slag is carried out to upgrading, wherein, smelting steel grade is Q345, and converter is 80t, converter tapping is complete, by high hopper, to the magnesium carbon ball that adds embodiment 1 to make in stove, magnesium carbon ball input amount is 10%～15% of slag weight, with normal running station, to being blown into high pressure nitrogen in stove, carries out slag splashing operation, continuous three stove revision tests, before and after upgrading, slag composition sees the following form 3:
Table 3
Table 3 result shows that the magnesium carbon ball of embodiment 1 can effectively increase slag oxidation Mg content and fall low FeO content, thereby has improved slag viscosity, makes slag viscosity moderate, spatters slag and finishes rear inspection furnace lining situation, and slag dross is respond well, has improved and has spattered slag effect.
Claims (7)
1. after oriented silicon steel thermal treatment, discard a resource utilization method for magnesia powder, comprise the following steps:
1) discarded magnesia powder after the thermal treatment of collection oriented silicon steel, by this discarded magnesia powder and carbon dust, and asphalt powder mixes by following weight proportion: discarded magnesia powder, 60～95%; Carbon dust, 0～30%; Asphalt powder, 5～10%, obtain mixing raw material;
2) described mixing raw material being caused to diameter is the green pellets of 10～15mm, then described green pellets is incubated to 0.8～1.2 hour at 190～210 ℃, makes magnesium carbon ball, takes out and naturally cools to room temperature;
3) described cooled magnesium carbon ball is used as to slag splashing furnace protecting material.
2. the resource utilization method of discarded magnesia powder after oriented silicon steel thermal treatment according to claim 1, is characterized in that: described step 3), the dosage of described magnesium carbon ball is 10～15% of slag weight.
3. the resource utilization method of discarded magnesia powder after oriented silicon steel thermal treatment according to claim 1 and 2, is characterized in that: described step 1), in described discarded magnesia powder, composition weight content is characterized as: MgO>=90%, TiO
2≤ 10%, SiO
2≤ 2%, Al
2o
3≤ 2%, TFe≤1%, other impurity≤1%, igloss amount≤1%; The granularity of described discarded magnesia powder is D50≤20 μ m.
4. after oriented silicon steel thermal treatment according to claim 1 and 2, discard the resource utilization method of magnesia powder, it is characterized in that: described step 1), to discard magnesia powder and carbon dust, and asphalt powder adds and in mixer, mixes 5～8min by described proportioning.
5. after oriented silicon steel thermal treatment according to claim 1 and 2, discard the resource utilization method of magnesia powder, it is characterized in that: described step 2), described mixing raw material is sent in pelletizer and added water pelletizing group, and amount of water is 5～10% of described mixing raw material weight.
6. the resource utilization method of discarded magnesia powder after oriented silicon steel thermal treatment according to claim 1 and 2, is characterized in that: described step 2), described green pellets is incubated 1～1.2 hour at 195～200 ℃, makes ripe pelletizing.
7. the resource utilization method of discarded magnesia powder after oriented silicon steel thermal treatment according to claim 1 and 2, is characterized in that: described step 1), described carbon dust is breeze, coal dust, or the combination of one or more arbitrary proportions in Graphite Powder 99.
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| CN104762436A (en) * | 2015-04-23 | 2015-07-08 | 攀钢集团研究院有限公司 | Method for reducing semisteel steel-making final slag total iron content |
| CN104988275A (en) * | 2015-07-14 | 2015-10-21 | 江苏正达炉料有限公司 | High-performance furnace slag regulator for revolving furnace slag sputtering furnace protection |
| CN105984890A (en) * | 2015-02-26 | 2016-10-05 | 宝山钢铁股份有限公司 | Method for producing flame retardant grade magnesium hydrate from oriented silicon steel magnesium oxide waste |
| CN105985533A (en) * | 2015-02-26 | 2016-10-05 | 宝山钢铁股份有限公司 | Method for preparing super high polymer plastic additive from oriented silicon steel magnesium oxide waste |
| CN107285743A (en) * | 2016-03-30 | 2017-10-24 | 宝山钢铁股份有限公司 | A kind of method that discarded magnesia prepares porous ceramics |
| CN114763582A (en) * | 2021-01-15 | 2022-07-19 | 宝山钢铁股份有限公司 | Method for producing magnesium pellets by using oriented silicon steel magnesium oxide waste |
| CN116854492A (en) * | 2023-07-25 | 2023-10-10 | 湖南湘钢瑞泰科技有限公司 | Method for recycling magnesium-containing mixed waste brick slag |
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| CN107285743A (en) * | 2016-03-30 | 2017-10-24 | 宝山钢铁股份有限公司 | A kind of method that discarded magnesia prepares porous ceramics |
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| CN114763582B (en) * | 2021-01-15 | 2023-09-12 | 宝山钢铁股份有限公司 | Method for producing magnesium pellets by using oriented silicon steel magnesia waste |
| CN116854492A (en) * | 2023-07-25 | 2023-10-10 | 湖南湘钢瑞泰科技有限公司 | Method for recycling magnesium-containing mixed waste brick slag |
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