CN1173548A - Process for directly producing rare-earth ferrosilicon (containing Ba) alloy by 1000-5000 KVA ferrosilicon furnace - Google Patents
Process for directly producing rare-earth ferrosilicon (containing Ba) alloy by 1000-5000 KVA ferrosilicon furnace Download PDFInfo
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- CN1173548A CN1173548A CN 97106958 CN97106958A CN1173548A CN 1173548 A CN1173548 A CN 1173548A CN 97106958 CN97106958 CN 97106958 CN 97106958 A CN97106958 A CN 97106958A CN 1173548 A CN1173548 A CN 1173548A
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Abstract
A technology for direct production of rare-earth ferrosilicon alloy containing barium with 1000-5000 KVA ferrosilicon furnace includes calcining F-C-Ce-La (REFCO3) containing REO (46-60%) in reverberatory furnace at 800-910 deg. C for one hr, natural cooling (weight decreasing rate is 18-20%), addition of blue carbon powder (150-200 meshes) and adhesive, granulating at pressure higher than 20 MPa and smelting. The power density of furnace body is 75% of that for smelting ferrosilicon and the diameter of liniting circle is 90-95% of that for smelting ferrosilicon.
Description
The invention belongs to electric heating process and adopt the pre-treatment ore to refine alloy type, is the technology of a kind of 1000-5000KVA ferrosilicon stove direct production rare earth ferrosilicon (baric) alloy specifically.
The production method of rare earth ferrosilicon alloy mainly is electricity consumption silicothermic process (electric arc furnace production) at present, promptly make reductive agent with 75% ferrosilicon, produce as raw material with rich slag of rare earth and rare earth ore concentrate, this method is owing to its power consumption height, and bed drain purge is big, contaminate environment, rare earth yield is low, waste a large amount of rare earth resources, the production cost height, thereby restricted the development of producing.In order to change existing production method, some enterprises have made many good tries both at home and abroad, utilize conventional carbonaceous reductive agent, in the hot stove in ore deposit, carried out the production test of rare earth ferrosilicon alloy, these attempt producing aspect the rare earth ferrosilicon alloy exploring carbothermy, have opened up new way in this field to people.These tests are because the reductive agent reactive behavior that adopts is relatively poor, caused greying tendency increase in the reaction process, thereby more easily cause accretion to generate, production cycle is shorter, also needs to make false furnace lining aborning, transforms body of heater, make production cost increase, limited suitability for industrialized production, for these reasons, the smelting process of rare earth ferrosilicon alloy must be done further improvement.
The objective of the invention is to avoid above-mentioned weak point of the prior art and providing a kind of is reductive agent with blue charcoal, adopt the technology of 1000-5000KVA ferrosilicon stove direct production rare earth ferrosilicon (baric) alloy, thereby it is stable to have established the working of a furnace, no furnace bottom dross, furnace life is long, energy consumption is low, no slag melting, but produce the purpose of rare earth ferrosilicon (baric) alloy to reach continuity.
Purpose of the present invention can reach by following measure:
A kind of technology with 1000-5000KVA ferrosilicon stove direct production rare earth ferrosilicon (baric) alloy, wherein theoretical carbon and actual carbon ratio example is 0.87-0.93 in this technology, the ratio of rare earth metal and silicon is 0.54-0.56, the uniform stove hall of the furnace charge for preparing is also smelted, went out an alloy in tundish every 2-3 hour, after waiting to leave standstill 3-5 minute, pour into and cast iron ingot, it is characterized in that and to contain the f_c_ce_la concentrate powder (REFCO of 46-60%REO
3) placed in 800-91 ℃ the down-draft kiln roasting 1 hour, lower the temperature naturally, making the calcination loss rate is 18-20%; Rare earth ore concentrate powder after the calcination adds blue powdered carbon (granularity 150-200 order), caking agent, at pressure greater than 20MP
aApparatus for making pearl ball in make ball; Adopting blue charcoal to make reductive agent smelts; The body of heater power density adopts the smelting parameter of 75% ferrosilicon, and electrode circle diameter is the 90-95% of 75% ferrosilicon smelting parameter.
Purpose of the present invention can also reach by following measure:
Blue carbon granule degree is 5-20mm;
Caking agent adopts poly-propionic acid amide or water glass;
The add-on of powdered carbon all is converted into REC by rare earth
2The 1-6 of required theoretical carbon amount times, making sphere diameter is 20-55mm.
With f_c_ce_la concentrate powder (gravity ore or flotation ore deposit) REO46-60%, B
aSO4-15%, F5-8% places down-draft kiln, and 800-900 ℃ of following roasting 1 hour, the concentrate rate of weight loss was 18-20%, and the concentrate after the roasting contains REO55-70%, and roasted ore is carried out briquetting according to the following steps:
Roasted ore 100kg, blue powdered carbon 40kg, water glass 17kg puts into mixer and stirred 15 minutes, and the pressure of packing into is greater than 20MP
aRoller mill in be rolled into pelletizing, drying, pelletizing granularity 25-55mm, REO amount is 64-66% in the pelletizing, the oven dry back is standby.Its medium blue powdered carbon fixed carbon is greater than 80%, and granularity is greater than 150 orders, join carbon and be theoretical carbon amount 1.5 times.
Embodiment 1:
Get the good rare earth pelletizing 58kg (REO64-66%) of roasting, silica 100kg (SiO
2＞98.5%), lumpiness 25-60mm, wherein greater than 40mm be not less than 80%, blue charcoal 38kg, granularity 5-15mm, fixed carbon is greater than 80%.Above furnace charge accurately measures the back and fully mixes thoroughly on table, equably furnace charge added in the 1800KVA ferrosilicon stove, and this stove electrode circle diameter 1350mm, electrode diameter 500mm, and keep former power supply parameter constant, change electrode circle diameter according to counterweight.Secondary side voltage 70-75V, primary side current 140-160A, by above data manipulation, working of a furnace fortune is waken up good, and furnace charge is non-caked, and furnace charge sinks evenly, taps a blast furnace once in per 2 hours, and molten iron is through 1000mm chute direct pouring ingot mould, and alloy thickness is no more than 100mm.
Embodiment 2:
Get the good rare earth pelletizing 115kg (REO64-66%) of roasting, silica 200kg (SiO
2＞98.5%), lumpiness 25-70mm, wherein greater than 40mm be not less than 80%, blue charcoal 78kg, granularity 8-20mm, fixed carbon is greater than 80%.Above furnace charge accurately measures the back and fully mixes thoroughly on table, evenly furnace charge added in the 3600KVA ferrosilicon stove, and this stove electrode circle diameter 1620mm, electrode diameter 600mm, and keep former power supply parameter constant, change electrode circle diameter according to counterweight.Secondary side voltage 76-82V, primary side current 190-210A, by above data manipulation, working of a furnace operational excellence, furnace charge is non-caked, and furnace charge sinks evenly, taps a blast furnace once in per 2 hours, and molten iron is through 1300mm chute direct pouring ingot mould, and alloy thickness is no more than 100mm.
With technology smelting RE-Si of the present invention (baric) alloy, its Chemical Composition is as follows:
REM27-35%, Si48-60%, B
a1-8%, C
a＜1%, Al＜1.5%, Ti＜0.3%, F
eSurplus.
The present invention has following advantage compared to existing technology:
The present invention is owing to adopted high activity, and the high-quality reducing agent of high resistivity---blue charcoal is so that reaction speed Accelerate, electrode is dark inserting (general insertion depth 500-1000mm) easily, and the adjustment of utmost point heart circle makes Power density is improved, and the needed high temperature of molten alloy can guarantee, such as embodiment 1 1800 The KVA Fesi Furnace directly turns to refining rare earth ferrosilicon (baric) alloy, by the test of tapping a blast furnace for 750 times, its Ton surplus product rare earth ferrosilicon (baric) the REM30% alloy 260, furnace condition anterograde, furnace bottom does not have rise, Turn to refining rare earth ferrosilicon (baric) alloy transition phase weak point, generally just can steady production REM after 48 hours 30% rare earth ferrosilicon (baric) product. This alloy physics better performances, section is silvery white in color, not powder Change, segregation is little, and rare earth yield is smelted greater than 96% (take the REM30% alloy as the benchmark ton) The technology power consumption of one benchmark ton is generally at 9000-9800KWh. Using the present invention can make domestic Numerous Fesi Furnaces need not transformed, and just can directly turn to refining rare earth ferrosilicon (baric) alloy, because its rare earth is received The rate height, integrated cost is low, and energy savings can be brought good economic benefit to enterprise, fully effectively land productivity Use rare earth resources, carry out large-scale industrial production.
Claims (4)
1, a kind of technology with 1000-5000KVA ferrosilicon stove direct production rare earth ferrosilicon (baric) alloy, wherein theoretical carbon and actual carbon ratio example is 0.87-0.93 in this technology, the ratio of rare earth metal and silicon is 0.54-0.56, the uniform stove hall of the furnace charge for preparing is also smelted, went out an alloy in tundish every 2-3 hour, after waiting to leave standstill 3-5 minute, pour into and cast iron ingot, it is characterized in that and to contain the f_c_ce_la concentrate powder (REFCO of 46-60%REO
3) placed in 800-910 ℃ the down-draft kiln roasting 1 hour, lower the temperature naturally, making the calcination loss rate is 18-20%; Rare earth ore concentrate powder after the calcination adds blue powdered carbon (granularity 150-200 order), caking agent, at pressure greater than 20MP
aApparatus for making pearl ball in make ball; Adopting blue charcoal to make reductive agent smelts; The body of heater power density adopts the smelting parameter of 75% ferrosilicon, and electrode circle diameter is the 90-95% of 75% ferrosilicon smelting parameter.
2, the technology of 1000-5000KVA ferrosilicon stove direct production rare earth ferrosilicon according to claim 1 (baric) alloy is characterized in that blue carbon granule degree is 5-20mm.
3,, it is characterized in that caking agent adopts poly-propionic acid amide or water glass according to the technology of weighing and require 1 described 1000-5000KVA ferrosilicon stove direct production rare earth ferrosilicon (baric) alloy.
4, the technology of 1000-5000KVA ferrosilicon stove direct production rare earth ferrosilicon according to claim 1 (baric) alloy is characterized in that the add-on of powdered carbon all is converted into REC by rare earth
2The 1-6 of required theoretical carbon amount times, making sphere diameter is 20-55mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97106958 CN1173548A (en) | 1997-05-06 | 1997-05-06 | Process for directly producing rare-earth ferrosilicon (containing Ba) alloy by 1000-5000 KVA ferrosilicon furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97106958 CN1173548A (en) | 1997-05-06 | 1997-05-06 | Process for directly producing rare-earth ferrosilicon (containing Ba) alloy by 1000-5000 KVA ferrosilicon furnace |
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| CN1173548A true CN1173548A (en) | 1998-02-18 |
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| CN 97106958 Pending CN1173548A (en) | 1997-05-06 | 1997-05-06 | Process for directly producing rare-earth ferrosilicon (containing Ba) alloy by 1000-5000 KVA ferrosilicon furnace |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104878289A (en) * | 2015-06-29 | 2015-09-02 | 理县岷江稀土新材料开发有限公司 | Ceric rare earth ferrosilicon alloy and production method thereof |
| CN108456773A (en) * | 2018-05-03 | 2018-08-28 | 包头市华商稀土合金有限公司 | A method of producing rare earth ferrosilicon alloy |
| CN108611543A (en) * | 2018-05-12 | 2018-10-02 | 包头市华商稀土合金有限公司 | A method of producing rare earth magnesium ferrosilicon alloy based on comprehensive utilization of resources means |
| CN110684896A (en) * | 2018-10-19 | 2020-01-14 | 华卫国 | High-temperature smelting method for decomposing bastnaesite |
-
1997
- 1997-05-06 CN CN 97106958 patent/CN1173548A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104878289A (en) * | 2015-06-29 | 2015-09-02 | 理县岷江稀土新材料开发有限公司 | Ceric rare earth ferrosilicon alloy and production method thereof |
| CN108456773A (en) * | 2018-05-03 | 2018-08-28 | 包头市华商稀土合金有限公司 | A method of producing rare earth ferrosilicon alloy |
| CN108456773B (en) * | 2018-05-03 | 2019-06-28 | 包头市华商稀土合金有限公司 | A method of producing rare earth ferrosilicon alloy |
| CN108611543A (en) * | 2018-05-12 | 2018-10-02 | 包头市华商稀土合金有限公司 | A method of producing rare earth magnesium ferrosilicon alloy based on comprehensive utilization of resources means |
| CN108611543B (en) * | 2018-05-12 | 2019-11-12 | 包头市华商稀土合金有限公司 | A method of rare earth magnesium ferrosilicon alloy is produced based on comprehensive utilization of resources means |
| CN110684896A (en) * | 2018-10-19 | 2020-01-14 | 华卫国 | High-temperature smelting method for decomposing bastnaesite |
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