CN114349009A - Slag agent for refining and deferrization of iron and titanium outside industrial silicon furnace - Google Patents
Slag agent for refining and deferrization of iron and titanium outside industrial silicon furnace Download PDFInfo
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- CN114349009A CN114349009A CN202210074170.9A CN202210074170A CN114349009A CN 114349009 A CN114349009 A CN 114349009A CN 202210074170 A CN202210074170 A CN 202210074170A CN 114349009 A CN114349009 A CN 114349009A
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- industrial silicon
- iron
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 62
- 239000002893 slag Substances 0.000 title claims abstract description 61
- 229910052710 silicon Inorganic materials 0.000 title claims abstract description 53
- 239000010703 silicon Substances 0.000 title claims abstract description 53
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 title claims abstract description 52
- 238000007670 refining Methods 0.000 title claims abstract description 51
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 title claims abstract description 36
- 229910052719 titanium Inorganic materials 0.000 title claims abstract description 36
- 239000010936 titanium Substances 0.000 title claims abstract description 36
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 34
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 31
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000012535 impurity Substances 0.000 claims abstract description 28
- 229910052681 coesite Inorganic materials 0.000 claims abstract description 20
- 229910052906 cristobalite Inorganic materials 0.000 claims abstract description 20
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 20
- 229910052682 stishovite Inorganic materials 0.000 claims abstract description 20
- 229910052905 tridymite Inorganic materials 0.000 claims abstract description 20
- 229910001635 magnesium fluoride Inorganic materials 0.000 claims abstract description 17
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims abstract description 15
- FUJCRWPEOMXPAD-UHFFFAOYSA-N Li2O Inorganic materials [Li+].[Li+].[O-2] FUJCRWPEOMXPAD-UHFFFAOYSA-N 0.000 claims abstract description 14
- XUCJHNOBJLKZNU-UHFFFAOYSA-M dilithium;hydroxide Chemical compound [Li+].[Li+].[OH-] XUCJHNOBJLKZNU-UHFFFAOYSA-M 0.000 claims abstract description 14
- 229910001634 calcium fluoride Inorganic materials 0.000 claims abstract description 13
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims abstract description 10
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims abstract description 9
- 239000002994 raw material Substances 0.000 claims description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 9
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- 239000003245 coal Substances 0.000 claims description 5
- 229910002804 graphite Inorganic materials 0.000 claims description 5
- 239000010439 graphite Substances 0.000 claims description 5
- 239000000843 powder Substances 0.000 claims description 5
- 239000006229 carbon black Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 10
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 abstract description 8
- 238000007664 blowing Methods 0.000 abstract description 8
- 229910052791 calcium Inorganic materials 0.000 abstract description 8
- 239000011575 calcium Substances 0.000 abstract description 8
- 230000008569 process Effects 0.000 abstract description 8
- 239000000446 fuel Substances 0.000 abstract description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 14
- 239000000126 substance Substances 0.000 description 14
- 239000004408 titanium dioxide Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000002844 melting Methods 0.000 description 5
- 230000008018 melting Effects 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- AYJRCSIUFZENHW-UHFFFAOYSA-L barium carbonate Chemical compound [Ba+2].[O-]C([O-])=O AYJRCSIUFZENHW-UHFFFAOYSA-L 0.000 description 4
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 4
- 239000000292 calcium oxide Substances 0.000 description 4
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 2
- 229910021532 Calcite Inorganic materials 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 1
- UGACIEPFGXRWCH-UHFFFAOYSA-N [Si].[Ti] Chemical compound [Si].[Ti] UGACIEPFGXRWCH-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000000498 ball milling Methods 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000006231 channel black Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000010436 fluorite Substances 0.000 description 1
- 239000007770 graphite material Substances 0.000 description 1
- 150000002500 ions Chemical group 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 description 1
- 229910052808 lithium carbonate Inorganic materials 0.000 description 1
- ORUIBWPALBXDOA-UHFFFAOYSA-L magnesium fluoride Chemical compound [F-].[F-].[Mg+2] ORUIBWPALBXDOA-UHFFFAOYSA-L 0.000 description 1
- 230000010534 mechanism of action Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- -1 nitrides Chemical class 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000006235 reinforcing carbon black Substances 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000012856 weighed raw material Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
- 239000010456 wollastonite Substances 0.000 description 1
- 229910052882 wollastonite Inorganic materials 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
Images
Abstract
The invention relates to a slag agent for refining and deferrization and titanium outside an industrial silicon furnace, which is used for achieving the purpose of refining and deferrization and titanium. The invention relates to a slag agent for refining and deferrization outside an industrial silicon furnace and titanium, which comprises the following characteristic components (mass fraction): 5 percent of<CEO<15％；4％<CaF2<15％；40％<SiO2<60％，Li2O、Na2O、MgF2One or two or three of the three components form a combination, 5%<The combination body<25% and satisfies Li2O<10％，Na2O<17％，MgF2<8％；2％<C<18％；BO<5％；Fe2O3+MNo<1 percent; the balance being impurities. The slag agent is used for refining outside an industrial silicon furnace, is matched with silicon ladle blowing refining, can obviously reduce the content of iron and titanium brought into industrial silicon by raw fuel on the basis of not influencing refining dealumination and calcium, and does not influence the stability of a refining process.
Description
Technical Field
The invention relates to the technical field of external refining in industrial silicon production, in particular to a slag agent for external refining of iron and titanium in industrial silicon, which can remove and reduce impurity elements of iron and titanium in industrial silicon on the basis of not influencing the external refining dealumination and calcium of the industrial silicon, and belongs to the field of industrial silicon production and refining.
Background
In the production process of industrial silicon, part of impurity elements in raw materials and fuels are reduced into the industrial silicon at high temperature, wherein the impurity elements mainly comprise calcium, aluminum, titanium, iron, phosphorus and the like. Some downstream users of industrial silicon have stringent requirements for the levels of these impurities in the finished product. Therefore, at present, active elements such as calcium, aluminum and the like are oxidized and enter slag to be removed in a mode of external refining oxygen blowing after silicon discharging. However, titanium has a very low reducibility and a low content unlike silicon, and thus is currently difficult to remove by conventional oxygen blowing. Also, since silicon is more reducing than iron, it is difficult to remove it by oxidation. Therefore, for iron and titanium impurities, the impurity content of raw materials is generally controlled, or the impurities are removed by wet methods such as crushing and acid leaching of industrial silicon. With the decrease of reserves of ore raw materials and fuels with less impurity content and the occurrence of limiting factors such as cost control, the demands of low-cost and high-efficiency iron and titanium removal are more urgent. The slag agent for the out-of-furnace refining of the industrial silicon to remove the iron and the titanium can accelerate the slagging rate of the air blowing refining of the industrial silicon and the removal rate of the iron and the titanium on the basis of not influencing the normal refining to remove the calcium and the aluminum.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the slag agent for the external refining of the industrial silicon furnace for removing iron and titanium.
The technical solution of the invention for realizing the above purpose is as follows:
a slag agent for refining and deferrizing iron and titanium outside an industrial silicon furnace is characterized in that: the chemical composition weight percentage of the product is 5 percent<CEO<15％；4％<CaF2<15％；40％<SiO2<60％，Li2O、Na2O、MgF2One or two or three of the three components form a combination, 5%<The combination body<25% and satisfies Li2O<10％，Na2O<17％，MgF2<8；2％<C<18％；BO<5％；Fe2O3+M No<1 percent; the balance being impurities.
Further, the CEO/SiO20.1 to 0.6. The carbon (C) in the components is provided by one, two or three of graphite, carbon black and coal powder as raw materials, and the total volatile content of the raw materials is not more than 15%.
The method effectively reduces the contents of iron and titanium in the industrial silicon, does not influence the removal efficiency of impurity elements such as aluminum, calcium and the like in the refining process, is favorable for improving the purity and the grade of the industrial silicon, reduces the loss of simple substance silicon in the blowing refining process, shortens the refining time and improves the refining efficiency. The concrete aspects are as follows:
1) SiO in the refining slag2And F-The weight percentage of the components of the relevant fusing agent is higher and respectively reaches 40 percent<SiO2<60 percent to 4 percent<CaF2<15% and Li is added2O、Na2O、MgF2And the flux is relatively reduced in viscosity and melting point on the basis of ensuring the CEO capacity of the primary slag, and is favorable for rapidly absorbing and assimilating solid-phase impurity particles such as calcium oxide, aluminum oxide and titanium oxide in dynamics.
2) After various alkaline oxides are added, according to the generation principle of inverse glass, although the comprehensive alkalinity of the slag is higher, the crystallization capacity is weakened, the capacity and the speed for absorbing aluminum oxide and titanium oxide are enhanced, the refining efficiency is improved, and the refining time is shortened.
3) Because a large amount of SiO is pre-mixed into the slag2Can replace part of metalOxidation of silicon to form SiO2And the final metal yield is improved.
4) After the titanium dioxide and the iron are directly contacted with the slag, stable compounds such as nitrides, carbonitrides and complex ion groups of impurity elements can be formed with specific components of the slag, so that the activity of the stable compounds in the slag is reduced, the oxidation removal process of the titanium is continuously carried out, and meanwhile, the iron is fixed in the slag phase, so that the content of the iron and the titanium in the metallic silicon can be obviously reduced.
5) The slag is suitable for the silicon ladle blowing refining process of removing iron and titanium in industrial silicon.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a table showing the chemical composition percentages by weight of two examples of slag agent composition production by external refining of titanium-removed slag according to the present invention with the balance being unavoidable impurities;
the table in figure 2 lists the major impurity components before and after refining of two example commercial silicon.
Detailed Description
The invention provides silicon refining slag suitable for reducing the content of iron and titanium in industrial silicon, and the slag agent solves the technical problems that: on the basis of not influencing the external refining dealumination and calcium removal of the industrial silicon, the impurity elements of iron and titanium in the industrial silicon are removed and reduced. Is beneficial to improving the purity and the grade of the industrial silicon, reduces the loss of the simple substance silicon in the blowing refining process, shortens the refining time and improves the refining efficiency
Specifically, the invention realizes the purpose by adding and adjusting the chemical proportion of the slag agent, and the weight percentage of the chemical components of the slag agent meets the following requirements: 5 percent of<CEO<15％；4％<CaF2<15％；40％<SiO2<60％，Li2O、Na2O、MgF2One or two or three of the three components form a combination, 5%<The combination body<25% and satisfies Li2O<10％，Na2O<17％，MgF2<8％；2％<C<18％；BO<5％；Fe2O3+M No<1 percent; the balance being impurities.
The CEO/SiO20.1 to 0.6.
The carbon (C) in the components is provided by one, two or three of graphite, carbon black and coal powder as raw materials, and the total volatile content of the raw materials is not more than 15%.
Further, the preferable weight percentage of the chemical components is as follows:
(1) CEO 8.9%, CaF 211% of SiO 246% of Li2O、Na2O、MgF2One or two or three of the three components constitute 21.7% of the composition, 3.5% of BO, 6.3% of C and Fe2O3+ M No 0.51%, the remainder being impurities.
(2) CEO 11.3%, CaF 28% of SiO 251% of Li2O、Na2O、MgF2One or two or three of the three components constitute a composite of 17.5%, BO of 4.1%, C of 5.2%, Fe2O3+ M No 0.35%, the remainder being impurities.
The mechanism of action of the chemical components of the iron and titanium refining slag agent and the limit of the addition amount thereof are explained as follows:
SiO2: is an acidic oxide and also one of the main components of the slag agent, is a network former in the slag, can generate a low-melting-point substance by combining with a basic oxide such as calcium oxide and can reduce the melting point of the slag agent. High content of SiO in primary slag2Is beneficial to accelerating slagging, reducing the oxidation of metal silicon and promoting the absorption of slag agents to impurities such as calcium oxide and the like. But too high SiO2The invention can also slow down the slagging speed, increase the viscosity of the molten slag and obstruct the absorption of impurities, and through theoretical design and experiments, the invention finally uses SiO2The content is controlled to be 40 percent<SiO2<The 60% range.
CEO: one of the basic oxides in the slag, because CEO is the product of the oxidation removal of calcium in the metallic silicon, the content added in the primary slag cannot be too high, otherwise the removal of calcium oxide by slag agents is affected, but in order to increase the absorption of titanium dioxide and aluminum oxide, a certain amount of CEO needs to be added, and the weight percentage range is determined by design: 5% < CEO < 15%.
CaF2: the additive is an important flux in the slag, and can be added in a certain range, so that the high-temperature viscosity of the slag agent can be obviously reduced, the slagging efficiency of the slag agent is improved, and the kinetic property of dissolving impurities is improved. However, if the amount of the additive is too large, the region where the reverse glass is formed is easily broken, and crystals containing a high melting point are precipitated, which is disadvantageous in the refining process. Through theoretical design and experiments, the invention uses CaF2The content is controlled to be 4%<CaF2<15％。
M No and Fe2O3: having strong oxidizing property, the invention uses Fe2O3The content of + M No is controlled to be less than 1%.
One of BO and basic oxide can replace partial CEO, can weaken the crystallization property of the slag agent, but the excessive content can obviously increase the density of the slag agent, so that the slag-silicon separation is not good, and the invention is controlled by theoretical design and experiments as follows: BO < 5%.
C: so that the slag agent keeps good melting uniformity and air permeability. The invention controls the content of C in the range of 2% < C < 18%.
Li2O、Na2O、MgF2: the invention removes important components of titanium and iron for controlling the slag agent. The key points of the invention are as follows: the slag has low binary alkalinity and high-temperature viscosity, and is not beneficial to effectively removing acidic oxides such as titanium dioxide, and the like, so the titanium dioxide dissolution rate of a slag system is improved by increasing the comprehensive alkalinity and adding the alkaline oxides and fluoride. Meanwhile, the generated titanium dioxide and slag components generate complex and stable compounds, the activity of the titanium dioxide in the slag is reduced, and the titanium removal efficiency is improved. After the components of the slag are adjusted, the solubility of nitrogen in the slag is changed, and the separation of a nitrogen-containing or carbon-containing complex phase of iron in the slag can be promoted, so that the effective removal of iron in the industrial silicon is promoted.
Albeit to Li2O、Na2O and MgF2The three components are controlled separately, butFor the present invention, it is necessary to include at least one to two of these three components, and the mass content of the selected combination of the components is 5% to 25%.
The preparation method of the silicon refining slag suitable for reducing the iron and titanium content in the industrial silicon comprises the following steps:
1) raw materials and requirements: detecting chemical components of the raw materials, and selecting the raw materials with the chemical components in percentage by weight meeting the following requirements:
wollastonite: SiO 2248-54％,CEO 40-45％,Al2O3＜1.5％,S＜0.02％；
Calcite: CEO > 55%;
fluorite: CaF2>90％,SiO2＜6.0％,S＜0.05％；
Cement clinker: CEO>60％，SiO2<24％；
Phosphorus slag: CEO 45-50%, SiO235-45％
Industrial soda: na (Na)2CO3＞95％；
Industrial lithium carbonate: li2CO3＞95％；
Industrial magnesium fluoride: MgF2＞95％；
Industrial barium carbonate: BaCO3＞95％；
And (3) soil-like graphite: c is more than 85 percent;
bulk graphite: c is more than 85 percent;
channel black: c is more than 97 percent;
semi-reinforcing carbon black: c is more than 97 percent;
coal powder: c is more than 90 percent;
2) calculating the weight ratio of each raw material according to the chemical component weight percentage condition of the composition of the refining deferrization and the titanium slag agent outside the industrial silicon furnace;
3) weighing corresponding raw materials (except graphite materials, carbon black materials and coal powder) according to the calculated weight, crushing the weighed raw materials uniformly, granulating, melting uniformly in an electric furnace (keeping the temperature at 1350-1450 ℃ for about 20 minutes), and rapidly cooling after discharging to obtain a pre-melted material;
4) crushing the pre-melted material, adding the weighed carbonaceous material, adding normal-temperature water which is about 1 time of the weight of the dry material and a binder which is 1-2% of the weight of the dry material into a ball mill, and ball-milling for 20 minutes to prepare slurry;
5) and (4) spraying, granulating and drying the slurry into hollow slag balls with certain granularity, drying and packaging for later use.
Table 1 shows the chemical composition weight percentages of two examples produced by the slag agent component for the external refining of titanium removal of industrial silicon according to the invention, and the balance is inevitable impurities. Table 2 lists the major impurity components before and after refining of two example commercial silicon.
TABLE 1 typical chemical composition of slag agent for external refining and titanium removal of industrial silicon furnace according to the invention (weight percent, wt%)
TABLE 2 impurity content before and after refining (weight percent, wt%)
The refining slag agent is used for the refining production of industrial silicon titanium removal in certain industrial silicon plants in China, and the result shows that the iron and titanium removal effect is obvious in the blowing refining process, and under the premise of not changing the refining time, the sample titanium removal efficiency can reach 75.9%, and the iron removal efficiency can reach 70.4%.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (5)
1. The invention relates to a slag agent for refining and deferrization outside an industrial silicon furnace and titanium, which comprises the following characteristic components (mass fraction): 5 percent of<CEO<15％；4％<CaF2<15％；40％<SiO2<60％，Li2O、Na2O、MgF2One or two or three of the three components form a combination, 5%<The combination body<25% and satisfies Li2O<10％，Na2O<17％，MgF2<8；2％<C<18％；BO<5％；Fe2O3+M No<1 percent; the balance being impurities.
2. The slag agent for the external refining of iron and titanium of industrial silicon furnace according to claim 1, characterized in that: CEO/SiO20.1 to 0.6.
3. A slag agent for the out-of-furnace refining of iron and titanium for industrial silicon according to claims 1 and 2, characterized in that: the carbon (C) in the components is provided by one, two or three of graphite, coal powder and carbon black as raw materials, and the total volatile content of the raw materials is not more than 15%.
4. A slag agent for the out-of-furnace refining of iron and titanium for industrial silicon according to claims 1 to 3, characterized in that: CEO 8.9%, CaF211% of SiO246% of Li2O、Na2O、MgF2One or two or three of the three components constitute 21.7% of the composition, 3.5% of BO, 6.3% of C and Fe2O3+ M No 0.51%, the remainder being impurities.
5. A slag agent for the out-of-furnace refining of iron and titanium for industrial silicon according to claims 1 to 3, characterized in that: CEO 11.3%, CaF28% of SiO251% of Li2O、Na2O、MgF2Three groupsOne or two or three of the components are combined into a composition of 17.5%, BO of 4.1%, C of 5.2% and Fe2O3+ M No 0.35%, the remainder being impurities.
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| CN202210074170.9A CN114349009A (en) | 2022-01-21 | 2022-01-21 | Slag agent for refining and deferrization of iron and titanium outside industrial silicon furnace |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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