CN104099469B - The resource utilization method of discarded magnesia powder after orientation silicon steel heat treatment - Google Patents
The resource utilization method of discarded magnesia powder after orientation silicon steel heat treatment Download PDFInfo
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Abstract
The resource utilization method of discarded magnesia powder after the invention discloses a kind of orientation silicon steel heat treatment, comprise the following steps: 1) collect discarded magnesia powder after orientation silicon steel heat treatment, by this discarded magnesia powder and carbon dust, and asphalt powder carries out mix homogeneously by following weight proportion: discarded magnesia powder, 60～95%; Carbon dust, 0～30%; Asphalt powder, 5～10%, obtain mixed material; 2) green pellets causing diameter to be 10～15mm described mixed material, is then incubated 0.8～1.2 hour by described green pellets at 190～210 DEG C, prepares magnesium carbon ball; 3) the magnesium carbon ball after cooling is used as slag splashing furnace protecting material. The present invention is useless magnesia powder replacement light-burning magnesium powder production splashing slag in converter magnesium carbon ball after using orientation silicon steel heat treatment, this magnesium carbon ball mechanical strength is high, slag viscosity can be effectively improved, improve and spatter slag effect, so that discarded magnesia powder is utilized effectively, save stacking land used, it is to avoid underground water pollution, there is environmental protection and economic double effect.
Description
Technical field
The present invention relates to solid waste resource recovery technology, in particular to the resource utilization method of magnesia powder discarded after a kind of orientation silicon steel heat treatment.
Background technology
In orientation silicon steel production process, excessive silicon-steel grade magnesium oxide need to be coated on silicon strip surface and other additives a small amount of carry out double annealing, only have part silicon-steel grade magnesium oxide after this heat treatment react with the element silicon in orientation silicon steel and be retained in silicon strip surface, form magnesium silicate bottom, and all the other unreacted magnesium oxide come off from silicon strip surface in steel band uncoiling process, and it is collected in hopper by sack cleaner, collect the magnesium oxide powder obtained owing to losing original high reaction activity in heating process, cannot again be back to silicon steel to produce, it is stacked at slag field at present only as solid waste, properly utilized, occupied ground and contaminated environment. silicon-steel grade magnesium oxide only for the production of orientation silicon steel, has no the research report of discarded magnesia powder after being specifically designed for orientation silicon steel heat treatment in document.
Slag splashing is the important technology improving life of converter, before slag splashing operates, need to use slag splashing furnace protecting material that converter finishing slag is modified, improve the content reducing ferrous oxide in slag while content of magnesia, slag is made to have suitable viscosity and refractoriness, it is easy to the formation that combines with furnace lining is spattered slag blanket and possesses certain corrosion resistance.
Summary of the invention
The resource utilization method of discarded magnesia powder after present invention aim to provide a kind of orientation silicon steel heat treatment, it is achieved the recycling of this discarded magnesia powder, and solve to pile up and take up an area 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 orientation silicon steel heat treatment, comprises the following steps:
1) discarded magnesia powder after collecting orientation silicon steel heat treatment, by this discarded magnesia powder and carbon dust, and asphalt powder carries out mix homogeneously by following weight proportion: discarded magnesia powder, and 60～95%; Carbon dust, 0～30%; Asphalt powder, 5～10%, obtain mixed material;
2) green pellets causing diameter to be 10～15mm described mixed material, is then incubated 0.8～1.2 hour by described green pellets at 190～210 DEG C, prepares magnesium carbon ball, takes out and naturally cools to room temperature;
3) the magnesium carbon ball after described cooling is used as slag splashing furnace protecting material.
Further, described step 3) in, dosage is slag weight the 10～15% of described magnesium carbon ball.
Further, described step 1) in, in described discarded magnesia powder, Ingredients Weight content characteristics is: MgO >=90%, TiO2≤ 10%, SiO2≤ 2%, Al2O3≤ 2%, TFe≤1%, other impurity≤1%, igloss amount≤1%; The granularity of described discarded magnesia powder is D50≤20 μm.
Further, described step 1) in, by discarded magnesia powder and carbon dust, and asphalt powder adds mixing 5～8min in batch mixer by described proportioning.
Further, described step 2) in, described mixed material is sent in pelletizer the pelletizing group that adds water, amount of water is the 5～10% of described mixed material weight.
Further, described step 2) in, described green pellets is incubated 1～1.2 hour at 195～200 DEG C, 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.
Compared with prior art, the invention have the advantages that
One, the composition of the present invention discarded magnesia powder after orientation silicon steel heat treatment and granularity feature, this discarded magnesia powder is used to replace light-burning magnesium powder to produce splashing slag in converter magnesium carbon ball, this magnesium carbon ball mechanical strength is high, slag viscosity can be effectively improved, improve and spatter slag effect, so that useless magnesia powder is utilized effectively after orientation silicon steel heat treatment, also save slag field simultaneously and stack land used, with discarded magnesia powder bulk density 0.6t/m3, in year discarded amount 10000t, the average high 3m of heap calculates, and can save land used about 0.6 mu every year.
They are two years old, magnesium oxide water soluble, permeate the ground and local water body hardness is adversely affected, present invention, avoiding discarded magnesium oxide polluted underground water source, recycling to this discarded magnesia powder, can creating pure economic benefit about 4,000,000 yuan every year, therefore, the present invention has obvious environmental protection and economic worth double effect.
Its three, this discarded magnesia powder itself has superfine granularity, it is not necessary to ball milling processing can directly participate in batch mixing, and magnesium carbon ball pelletizing method is simple, practical, effectively, and the magnesium carbon ball of preparation, result of use is excellent, with low cost.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described in further detail, it is simple to more clearly understand the present invention, but the present invention is not constituted restriction by them.
Embodiment 1:
After on-site collection orientation silicon steel heat treatment, discarded magnesia powder, carries out chemical composition analysis this discarded magnesia powder composition known and content (mass fraction) is as follows: MgO, and 92.3%; TiO2, 3.2%; SiO2, 1.6%; Al2O3, 1.5%;TFe0.3%, other impurity 0.8%, the granularity D50 being measured this discarded magnesia powder by laser particle size analyzer is 18.6 μm; Then by this discarded magnesia powder and carbon dust, and asphalt powder 60～95%:0 by weight ratio～30%:5～10%, preferred weight proportioning 70%:25%:5% adds mixing 5～8min in horizontal ribbon batch mixer, preferably mix 8min, discharging after mix homogeneously, obtain mixed material, wherein, carbon dust in raw material can be breeze, coal dust, or the combination of one or more arbitrary proportions in graphite powder, and what select in this example is coal dust;
Add water the green pellets causing diameter to be 10～15mm by above-mentioned mixed material feeding disc balling machine, and amount of water is the 5～10% of described mixed material weight, it is preferable that 10%; Then green pellets is sent in oven in 190～210 DEG C, it is preferable that at 200 DEG C, be incubated 0.8～1.2 hour, it is preferable that be incubated 1 hour, prepare magnesium carbon ball, after taking-up, naturally cool to room temperature;
Magnesium carbon ball after described cooling is used as slag splashing furnace protecting material, carries out slag splashing operation with normal operating station to being blown into high pressure nitrogen in stove, dosage is slag weight the 10～15% of magnesium carbon ball, it is preferable that dosage is 15%.
Empirical tests, this magnesium carbon ball can be effectively increased slag oxidation content of magnesium and drop low FeO content, spatters inspection furnace lining situation after slag terminates, and slag dross is respond well, the results detailed in table 3 below.
Embodiment 2:
After on-site collection orientation silicon steel heat treatment, discarded magnesia powder, carries out chemical composition analysis this discarded magnesia powder composition known and content (mass fraction) is as follows: MgO, and 94.3%; TiO2, 2.3%; SiO2, 1.2%; Al2O3, 0.9%; TFe0.3%, other impurity 0.7%, the granularity D50 being measured this discarded magnesia powder by laser particle size analyzer is 17.4 μm; Then by this discarded magnesia powder and breeze, and asphalt powder 60%:30%:10% by weight ratio adds mixing 5～8min, discharging after mix homogeneously in horizontal ribbon batch mixer, obtains mixed material;
Add water the green pellets causing diameter to be 10～15mm by above-mentioned mixed material feeding disc balling machine, and amount of water is the 5% of described mixed material weight; Then green pellets is sent in oven and be incubated 1 hour at 200 DEG C, prepare magnesium carbon ball, after taking-up, naturally cool to room temperature;
Magnesium carbon ball after described cooling is used as slag splashing furnace protecting material, carries out slag splashing operation with normal operating station to being blown into high pressure nitrogen in stove, dosage is slag weight the 10% of magnesium carbon ball.
Empirical tests, this magnesium carbon ball can be effectively increased slag oxidation content of magnesium and drop low FeO content, spatters inspection furnace lining situation after slag terminates, and slag dross is respond well.
Embodiment 3:
After on-site collection orientation silicon steel heat treatment, discarded magnesia powder, carries out chemical composition analysis this discarded magnesia powder composition known and content (mass fraction) is as follows: MgO, and 90.7%; TiO2, 5.1%; SiO2, 1.9%; Al2O3, 1.2%; TFe0.4%, other impurity 0.7%, the granularity D50 being measured this discarded magnesia powder by laser particle size analyzer is 17.7 μm; Then by this discarded magnesia powder and graphite, and asphalt powder 80%:15%:5% by weight ratio adds mixing 5～8min, discharging after mix homogeneously in horizontal ribbon batch mixer, obtains mixed material;
Add water the green pellets causing diameter to be 10～15mm by above-mentioned mixed material feeding disc balling machine, and amount of water is the 8% of described mixed material weight;Then green pellets is sent in oven and be incubated 1 hour at 200 DEG C, prepare magnesium carbon ball, after taking-up, naturally cool to room temperature;
Magnesium carbon ball after described cooling is used as slag splashing furnace protecting material, carries out slag splashing operation with normal operating station to being blown into high pressure nitrogen in stove, dosage is slag weight the 12% of magnesium carbon ball.
Empirical tests, this magnesium carbon ball can be effectively increased slag oxidation content of magnesium and drop low FeO content, spatters inspection furnace lining situation after slag terminates, and slag dross is respond well.
1) the magnesium carbon ball that embodiment 1～3 is prepared carries out chemical composition analysis (weight percentage), and result is table 1 below such as:
| Embodiment | MgO% | C% | SiO2% | 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 is it is shown that magnesium its chemical composition of carbon ball prepared for raw material with discarded magnesia powder meets slag splashing job requirements.
2) the magnesium carbon ball that embodiment 1～3 is prepared carries out shatter test and compressive strength test, respectively takes 10, sample ball and tests, averages, and result is table 2 below such as:
| Embodiment | Drop strength (secondary 0.5m-1) | Comprcssive strength (N-1) |
| Embodiment 1 | 4.8 | 5.3 |
| Embodiment 2 | 6.2 | 7.1 |
| Embodiment 3 | 5.6 | 6.5 |
Table 2
Table 2 is it is shown that the magnesium carbon ball mechanical strength for preparing of embodiment 1～3 is high, it is sufficient to the impact of jolting in opposing transportation.
3) the magnesium carbon ball that embodiment 1 prepares is used as slag splashing furnace protecting material, converter slag is carried out upgrading, wherein, smelting steel grade is Q345, and converter is 80t, converter tapping is complete, by high hopper to adding the magnesium carbon ball that embodiment 1 prepares in stove, magnesium carbon ball input amount is the 10%～15% of slag weight, carries out slag splashing operation with normal operating station to being blown into high pressure nitrogen in stove, continuous three stove repeated trials, before and after upgrading, slag composition is shown in table 3 below:
Table 3
Table 3 result shows that the magnesium carbon ball of embodiment 1 can be effectively increased slag oxidation content of magnesium and drop low FeO content, thus improve slag viscosity so that slag viscosity is moderate, spatters inspection furnace lining situation after slag terminates, and slag dross is respond well, improves and spatters slag effect.
Claims (6)
1. a resource utilization method for discarded magnesia powder after orientation silicon steel heat treatment, comprises the following steps:
1) discarded magnesia powder after collecting orientation silicon steel heat treatment, by this discarded magnesia powder and carbon dust, and asphalt powder carries out mix homogeneously by following weight proportion: discarded magnesia powder, and 60～95%; Carbon dust, 0～30%; Asphalt powder, 5～10%, obtain mixed material; In described discarded magnesia powder, Ingredients Weight content characteristics is: MgO >=90%, TiO2≤ 10%, SiO2≤ 2%, Al2O3≤ 2%, TFe≤1%, other impurity≤1%, igloss amount≤1%; The granularity of described discarded magnesia powder is D50≤20 μm;
2) green pellets causing diameter to be 10～15mm described mixed material, is then incubated 0.8～1.2 hour by described green pellets at 190～210 DEG C, prepares magnesium carbon ball, takes out and naturally cools to room temperature;
3) the magnesium carbon ball after described cooling is used as slag splashing furnace protecting material.
2. the resource utilization method of discarded magnesia powder after orientation silicon steel heat treatment according to claim 1, it is characterised in that: described step 3) in, dosage is slag weight the 10～15% of described magnesium carbon ball.
3. the resource utilization method of discarded magnesia powder after orientation silicon steel heat treatment according to claim 1 and 2, it is characterized in that: described step 1) in, by discarded magnesia powder and carbon dust, and asphalt powder adds mixing 5～8min in batch mixer by described proportioning.
4. the resource utilization method of discarded magnesia powder after orientation silicon steel heat treatment according to claim 1 and 2, it is characterized in that: described step 2) in, described mixed material is sent in pelletizer the pelletizing group that adds water, and amount of water is the 5～10% of described mixed material weight.
5. the resource utilization method of discarded magnesia powder after orientation silicon steel heat treatment according to claim 1 and 2, it is characterised in that: described step 2) in, described green pellets is incubated 1～1.2 hour at 195～200 DEG C, makes ripe pelletizing.
6. the resource utilization method of discarded magnesia powder after orientation silicon steel heat treatment according to claim 1 and 2, it is characterised in that: described step 1) in, described carbon dust is breeze, coal dust, or the combination of one or more arbitrary proportions in graphite powder.
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| CN105984890B (en) * | 2015-02-26 | 2017-11-28 | 宝山钢铁股份有限公司 | The method that orientation silicon steel magnesia discarded object produces flame-proof magnesium hydroxide |
| CN105985533B (en) * | 2015-02-26 | 2018-10-02 | 宝山钢铁股份有限公司 | The method that orientation silicon steel magnesia waste manufactures supra polymer plastic additive |
| CN104762436B (en) * | 2015-04-23 | 2016-10-05 | 攀钢集团研究院有限公司 | The method reducing semi-steel making finishing slag all 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 |
| CN107285743B (en) * | 2016-03-30 | 2021-02-19 | 宝山钢铁股份有限公司 | Method for preparing porous ceramic from waste magnesium oxide |
| 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 |
| CN116854492B (en) * | 2023-07-25 | 2024-10-15 | 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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