CN1718818A - Technology of producing low magnesium oxide rare earth calcium magnesium silicon iron alloy by thermo liquid joint production and thread feeding method - Google Patents
Technology of producing low magnesium oxide rare earth calcium magnesium silicon iron alloy by thermo liquid joint production and thread feeding method Download PDFInfo
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- CN1718818A CN1718818A CN 200510012718 CN200510012718A CN1718818A CN 1718818 A CN1718818 A CN 1718818A CN 200510012718 CN200510012718 CN 200510012718 CN 200510012718 A CN200510012718 A CN 200510012718A CN 1718818 A CN1718818 A CN 1718818A
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Abstract
A process for preparing a low-MgO RECaMgSiFe alloy by wire feeding method includes such steps as proportionally mixing silicon rock, RE ore concentrate, coke and steel filings, smelting in ore-heating furnace, proportionally mixing RESiFe alloy, SiCa alloy and SiFe alloy, smelting in MF induction furnace, pouring the molten alloy from ore-heating furnace into Mg-reducing ladle, uniformly feeding the cored wire containing leftover or SiCa, RE and trace elements, pouring the molten alloy from MF induction furnace into the ladle, adding Mg ingot and broken steel, and aerating for stirring.
Description
Technical field
The invention belongs to alloy smelting technology, be specifically related to a kind of technology that adopts the hydrothermal solution coproduction to add injection feeding technology production low magnesium oxide rare earth calcium magnesium ferro-silicon.
Background technology
Low magnesium oxide rare earth calcium magnesium ferro-silicon is one of nodulizing agent of producing in spheroidal graphite cast iron.Produce low magnesium oxide rare earth calcium magnesium ferro-silicon, need behind the product ingot casting to carry out the fragmentation screening according to the granularity of customer requirement, remaining tankage directly melt down smelting.Because it is Powdered melting down the tankage of smelting, melting process is easily lumpd, floating, slagging, and scaling loss is serious, and utilization ratio is low; Tankage remelting meeting simultaneously increases magnesian content, influences the nodularization effect of nodulizing agent.Need to add trace element in some nodulizing agent, when adding volatile trace element such as barium, bismuth, strontium loss bigger, production cost is increased.
In addition, calcium, content of rare earth are had relatively high expectations in some nodulizing agent, replenish being limited in scope of calcium and rare earth if directly adopt intermediate frequency furnace to adjust in the hydrothermal solution joint process.
Summary of the invention
The purpose of this invention is to provide a kind of technology that adopts the hydrothermal solution coproduction to add injection feeding technology production low magnesium oxide rare earth calcium magnesium ferro-silicon.In the technology of hot stove in ore deposit and intermediate frequency furnace hydrothermal solution coproduction low magnesium oxide rare earth calcium magnesium ferro-silicon, adopt injection feeding technology to add the tankage of alloy product, phenomenons such as the caking that occurs when avoiding melting process directly to add tankage, floating, volatilization, slagging also can improve the utilization ratio of these tankage simultaneously; The fusing of employing injection feeding technology interpolation trace element is fast, loss is little; Adopt injection feeding technology can adjust additional calcium, content of rare earth very easily, satisfy the production technique needs.
The technology that hydrothermal solution coproduction of the present invention adds injection feeding technology production low magnesium oxide rare earth calcium magnesium ferro-silicon is as follows:
With material silex, rare earth ore concentrate, coke, steel cuttings according to weight proportion 0.8-1.5: 0.01-0.4: 0.4-0.8: 0.4-0.8 mixes, add in the hot stove in ore deposit continuously, by self baking electrode electric current is imported melting batch and smelt, tapping temperature is controlled at 1500～1600 ℃; Rare earth ferrosilicon alloy, silicocalcium and ferro-silicon are mixed the back according to weight proportion 30-80: 40-90: 20-70 melt in medium-frequency induction furnace, tapping temperature is controlled at 1500～1700 ℃; Earlier the alloy liquation in the hot stove in ore deposit is added and press the magnesium bag, the cored-wire head that low magnesium oxide rare earth calcium magnesium ferro-silicon tankage or raw material silico-calcium, rare earth or micro-barium, bismuth, strontium, manganese will be housed is again sent at the uniform velocity line feeding in the pressure magnesium bag, and wire-feeding velocity is controlled at 0.2～1m/s; Rare earth silicon-calcium alloy with the medium-frequency induction furnace fusing in line feeding adds pressure magnesium bag according to 10～30% of ore deposit hot stove liquid alloy weight; at last according to pressing magnesium technology to be pressed into magnesium ingot; alloy per ton adds MAGNESIUM METAL 40～100kg; alloy in MAGNESIUM METAL and the bag reacts under nitrogen protection; temperature of reaction is controlled at 1250～1450 ℃; time is controlled at 150～200s; after pressing the magnesium operation to finish; add broken bloom according to 1～5% of total weight alloy as required; after continuing inflation 100-150s; with alloy liquation injection molding; cooling; broken; screening promptly gets low magnesium oxide rare earth calcium magnesium ferro-silicon.
The present invention is crushed to low magnesium oxide rare earth calcium magnesium ferro-silicon tankage, raw material silico-calcium and rare earth and micro-barium, bismuth, strontium, manganese below 5 millimeters, adopts bag core machine to be rolled into cored-wire respectively, and cored-wire is 50～100kg/100m.Based on interpolation low magnesium oxide rare earth calcium magnesium ferro-silicon tankage, during as if interpolation silico-calcium, rare earth and trace element, need calculate the back adding in the production according to customer requirement and starting material chemical composition analysis result.
The present invention in the technology of producing low magnesium oxide rare earth calcium magnesium ferro-silicon, adopt based on the hot stove in ore deposit, intermediate frequency furnace be assist, novel process that injection feeding technology is additional, can effectively utilize the tankage of alloy, significantly reduce production costs; Having overcome intermediate frequency furnace adjusts in the hydrothermal solution joint process and to replenish calcium, the rare earth cost is higher and setting range is limited deficiency; Trace element can be adopted cored-wire directly to feed in the alloy liquation of pressing in the magnesium bag in the production, reduce micro-loss.
Embodiment
Embodiment 1:
Adopt the hot stove in 3200KVA ore deposit, 0.5T medium-frequency induction furnace and feeding wire machine combination producing low magnesium oxide rare earth calcium magnesium ferro-silicon product.
Low magnesium oxide rare earth calcium magnesium ferro-silicon product main component requires: Mg5.5-5.9%, Ca2.7-2.9%, RE2.0-2.2%, Si44.0-48.0%, Al≤1.0%, Fe surplus.
Smelting technology:
1, with 1.1T silica, 0.040T rare earth ore concentrate, 0.70T coke, 0.52T steel cuttings, mix according to weight proportion, add in the hot stove in ore deposit continuously, with voltage control at 80-90V, current control is at 24000-26000A, through the smelting of about 100min, to prepare to come out of the stove, tapping temperature is controlled at 1500～1600 ℃.
2, behind the about 20min of the hot stove energising in ore deposit, 30kg rare earth ferrosilicon alloy, 50kg silicocalcium, 80kg ferro-silicon are mixed the adding medium-frequency induction furnace, power transfers to 180KW and carries out melting.In the melting process, furnace charge constantly be depressed, to accelerate burn-off rate.When 70min, furnace charge all melts approximately, when the alloy melt temperature reaches 1500-1700 ℃ in the stove, prepares to come out of the stove.
When adopting medium-frequency induction furnace fusing rare earth silicon-calcium alloy, according to the capacity of medium-frequency induction furnace, add rare earth alloy and silicocalcium in proportion after, surplus can be replenished ferro-silicon, silicone content is controlled at 47～50% in the rare earth silicon-calcium alloy.
3, the alloy liquation in the hot stove in ore deposit is put into pressure magnesium bag, skimmed, the back temperature of skimming is controlled at 1450-1550 ℃, and alloy liquation weight is about 1.0T; To press the magnesium bag to hang in and press in the magnesium hole; at this moment adopt feeding wire machine will low magnesium oxide rare earth calcium magnesium ferro-silicon tankage and raw material silico-calcium be housed respectively; the cored-wire head of rare earth is sent into and is pressed beginning line feeding in the magnesium bag; wire-feeding velocity is controlled at 0.5m/s; feed quantity low magnesium oxide rare earth calcium magnesium ferro-silicon tankage 130kg; raw material silico-calcium 10kg; raw material rare earth 10kg; simultaneously the about 160kg of alloy liquation in the medium-frequency induction furnace is put into and press the magnesium bag; inflated with nitrogen stirs 1min; liquation is mixed; metal magnesium ingot with 85kg is pressed in the bag then; MAGNESIUM METAL is reacted under nitrogen protection with the interior alloy of bag; temperature of reaction is controlled at 1250-1450 ℃; after pressing the magnesium operation to finish; rustless dry broken bloom is added in the pressure magnesium bag according to 3% of total weight alloy; after continuing inflation 100-150s; with alloy liquation injection molding; cooling; broken; screening promptly gets low magnesium oxide rare earth calcium magnesium ferro-silicon.
Through check, every technical indicator all meets the quality product technical requirements.
Embodiment 2
Adopt the hot stove in 3200KVA ore deposit, 0.5T medium-frequency induction furnace and feeding wire machine combination producing low magnesium oxide rare earth calcium magnesium ferro-silicon product.
Low magnesium oxide rare earth calcium magnesium ferro-silicon product main component requires: Mg5.5-6.5%, Ca2.0-2.5%, RE2.3-2.8%, Si44.0-48.0%, Ba0.2-0.3%, Al≤1.0%, Fe surplus.
Smelting technology:
1, with 1.1T silica, 0.024T rare earth ore concentrate, 0.68T coke, 0.55T steel cuttings, mix according to weight proportion, add in the hot stove in ore deposit continuously, with voltage control at 80-90V, current control is at 24000-26000A, through the smelting of about 100min, to prepare to come out of the stove, tapping temperature is controlled at 1500～1600 ℃.
2, behind the about 20min of the hot stove energising in ore deposit, 55kg rare earth ferrosilicon alloy, 50kg silicocalcium, 55kg ferro-silicon are mixed the adding medium-frequency induction furnace, power transfers to 180KW and carries out melting.In the melting process, furnace charge constantly be depressed, to accelerate burn-off rate.When 70min, furnace charge all melts approximately, when the alloy melt temperature reaches 1500-1700 ℃ in the stove, prepares to come out of the stove.
When adopting medium-frequency induction furnace fusing rare earth silicon-calcium alloy, according to the capacity of medium-frequency induction furnace, add rare earth alloy and silicocalcium in proportion after, surplus can be replenished ferro-silicon, silicone content is controlled at 47～50% in the rare earth silicon-calcium alloy.
3, the alloy liquation in the hot stove in ore deposit is put into pressure magnesium bag, skimmed, the back temperature of skimming is controlled at 1450-1550 ℃, and alloy liquation weight is about 1.0T; To press the magnesium bag to hang in and press in the magnesium hole; adopt feeding wire machine that the cored-wire head is sent into to press in the magnesium bag and begin line feeding; wire-feeding velocity is controlled at 0.8m/s; feed quantity silicon barium 14kg; low magnesium oxide rare earth calcium magnesium ferro-silicon tankage 136kg; simultaneously the about 160kg of the alloy in the intermediate frequency furnace is put into and press the magnesium bag; inflated with nitrogen stir about 1min; the alloy liquation is mixed; then 90kg metal magnesium ingot is pressed in the bag; alloy in MAGNESIUM METAL and the bag reacts under nitrogen protection; temperature of reaction is controlled at 1250-1450 ℃; after pressing the magnesium operation to finish, rustless dry broken bloom is added in the pressure magnesium bag according to 1.5% of total weight alloy, after continuing to inflate 100-150s; with alloy liquation injection molding; cooling; broken; screening promptly gets low magnesium oxide rare earth calcium magnesium ferro-silicon.
Through check, every technical indicator all meets the quality product technical requirements.
Claims (4)
1, a kind of hydrothermal solution coproduction adds the technology that injection feeding technology is produced low magnesium oxide rare earth calcium magnesium ferro-silicon, it is characterized in that technology is as follows:
With material silex, rare earth ore concentrate, coke, steel cuttings according to weight proportion 0.8-1.5: 0.01-0.4: 0.4-0.8: 0.4-0.8 mixes, add in the hot stove in ore deposit continuously, by self baking electrode electric current is imported melting batch and smelt, tapping temperature is controlled at 1500～1600 ℃; Rare earth ferrosilicon alloy, silicocalcium and ferro-silicon are mixed the back according to weight proportion 30-80: 40-90: 20-70 melt in medium-frequency induction furnace, tapping temperature is controlled at 1500～1700 ℃; Earlier the alloy liquation in the hot stove in ore deposit is added and press the magnesium bag, the cored-wire head that low magnesium oxide rare earth calcium magnesium ferro-silicon tankage or raw material silico-calcium, rare earth or micro-barium, bismuth, strontium, manganese will be housed is again sent at the uniform velocity line feeding in the pressure magnesium bag, and wire-feeding velocity is controlled at 0.2～1m/s; Rare earth silicon-calcium alloy with the medium-frequency induction furnace fusing in line feeding adds pressure magnesium bag according to 10～30% of ore deposit hot stove liquid alloy weight; at last according to pressing magnesium technology to be pressed into magnesium ingot; alloy per ton adds MAGNESIUM METAL 40～100kg; alloy in MAGNESIUM METAL and the bag reacts under nitrogen protection; temperature of reaction is controlled at 1250～1450 ℃; time is controlled at 150～200s; after pressing the magnesium operation to finish; add broken bloom according to 1～5% of total weight alloy as required; after continuing inflation 100～150s; with alloy liquation injection molding; cooling; broken; screening promptly gets low magnesium oxide rare earth calcium magnesium ferro-silicon.
2, hydrothermal solution coproduction according to claim 1 adds the technology that injection feeding technology is produced low magnesium oxide rare earth calcium magnesium ferro-silicon, it is characterized in that low magnesium oxide rare earth calcium magnesium ferro-silicon tankage, raw material silico-calcium and rare earth and micro-barium, bismuth, strontium, manganese are crushed to below 5 millimeters, adopt bag core machine to be rolled into cored-wire respectively.
3, add the technology that injection feeding technology is produced low magnesium oxide rare earth calcium magnesium ferro-silicon according to claim 1,2 described hydrothermal solution coproduction, it is characterized in that above-mentioned cored-wire is 50～100kg/100m.
4, hydrothermal solution coproduction according to claim 1 adds the technology that injection feeding technology is produced low magnesium oxide rare earth calcium magnesium ferro-silicon, when it is characterized in that adopting medium-frequency induction furnace fusing rare earth silicon-calcium alloy, capacity according to medium-frequency induction furnace, after adding rare earth alloy and silicocalcium in proportion, surplus can be replenished ferro-silicon, and silicone content is controlled at 47～50% in the rare earth silicon-calcium alloy.
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| CNB2005100127183A CN100363520C (en) | 2005-08-04 | 2005-08-04 | Technology of producing low magnesium oxide rare earth calcium magnesium silicon iron alloy by thermo liquid joint production and thread feeding method |
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| CNB2005100127183A CN100363520C (en) | 2005-08-04 | 2005-08-04 | Technology of producing low magnesium oxide rare earth calcium magnesium silicon iron alloy by thermo liquid joint production and thread feeding method |
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| CN1718818A true CN1718818A (en) | 2006-01-11 |
| CN100363520C CN100363520C (en) | 2008-01-23 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103757518A (en) * | 2014-01-03 | 2014-04-30 | 天津市万路科技有限公司 | Production method of high-quality spheroidizing agent |
| CN103866084A (en) * | 2012-12-10 | 2014-06-18 | 于跃华 | Method for adding volatile material into alloy |
| CN110438352A (en) * | 2019-09-07 | 2019-11-12 | 包头市华商稀土合金有限公司 | A kind of method of rare earth yield in raising rare earth ferrosilicon alloy |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1021060C (en) * | 1991-12-23 | 1993-06-02 | 无锡市江南合金研究所 | Nodularizing additive for casting high strength nodular graphite cast iron |
| RU2124566C1 (en) * | 1997-12-10 | 1999-01-10 | Открытое акционерное общество "КАМАЗ" | Briquetted mixture for inoculation of gray iron |
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2005
- 2005-08-04 CN CNB2005100127183A patent/CN100363520C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103866084A (en) * | 2012-12-10 | 2014-06-18 | 于跃华 | Method for adding volatile material into alloy |
| CN103757518A (en) * | 2014-01-03 | 2014-04-30 | 天津市万路科技有限公司 | Production method of high-quality spheroidizing agent |
| CN103757518B (en) * | 2014-01-03 | 2016-03-16 | 天津市万路科技有限公司 | The production method of high-quality nodulizing agent |
| CN110438352A (en) * | 2019-09-07 | 2019-11-12 | 包头市华商稀土合金有限公司 | A kind of method of rare earth yield in raising rare earth ferrosilicon alloy |
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