CN1257131A - Technology for producing rare earth barium silicide alloy by carbon thermal reduction method - Google Patents
Technology for producing rare earth barium silicide alloy by carbon thermal reduction method Download PDFInfo
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- CN1257131A CN1257131A CN 98121072 CN98121072A CN1257131A CN 1257131 A CN1257131 A CN 1257131A CN 98121072 CN98121072 CN 98121072 CN 98121072 A CN98121072 A CN 98121072A CN 1257131 A CN1257131 A CN 1257131A
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- rare earth
- barium
- coke
- coal
- reducing agent
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Abstract
A technological process for preparing rare earth-barium-silicon compound alloy by using carbothermic reduction method includes the following steps: using raw material containing rare earth and barium to make pelletization under the condition of carbonaceous reducing agent; using rare earth-barium pellet, silica and carbonanceous reducing agent to prepare charging material according to the following raw material ratio: the ratio of rare earth metal and barium and silicon is 0.3-0.8, the quantity of carbonaceous reducing agent is 0.9-1.0 time theoretical value, then they are uniformly fed into ore-smelting furnace to make smelting. It can implement slag-free smelting, its furnace bottom has no obvious rise, its rare earth and barium yields are high, and it is suitable for ore-smelting furnace to produce rare earth-barium-silicon compound alloy containing 10-35% RE, 5-15% Ba and 45-60% Si.
Description
The raw material that the present invention relates to use carbothermic reduction to contain rare earth, silicon and barium is produced the technology of rare earth barium silicide alloy, belongs to smelting technology.Be suitable in the hot stove in ore deposit, contain the raw material of rare earth, silicon and barium, produce and contain 10～35% rare earth metals (REM) and 5～15% barium (B with carbon reduction
a) rare earth barium silicide alloy.
The baric rare earth ferrosilicon alloy has been widely used as steel making deoxidant, properties-correcting agent, and as spheroidal graphite cast iron nodulizing agent and vermicular cast iron vermiculizer, also can directly be used as the nucleating agent of high-strength gray cast iron.The baric rare earth ferrosilicon has in use been brought into play the effect of rare earth on the one hand, and the synergy of barium is arranged again simultaneously, and its use properties ratio can be more superior with rare earth ferrosilicon alloy." rare earth barium is compound modifier research and uses " and " rare earth barium is the ferro-silicon product innovation " have obtained industrial application.Be in electric arc furnace, use raw materials such as rare earth, barite, carry out the two-stage reduction with ferrosilicon as reductive agent and make.This method has solved the loaded down with trivial details technology with rare earth ferrosilicon alloy and Si-Ba alloy secondary mix-melting method synthesizing rare-earth ferrous alloy containing barium and silicon, once makes the baric rare earth ferrosilicon alloy.But rare earth and the barium yield is low, the quantity of slag is big, composite technology power consumption height.U.S. Ford mineral company uses higher-grade hamartite, barium carbonate, Strontium carbonate powder, iron and silica to make raw material, the rare earth silicide alloy that contains calcium, strontium and barium is produced in carbon reduction in the hot stove in ore deposit, batching in this technology adopts carbonaceous reducing agent to cross theoretical amount up to 50%, must cause the furnace bottom dross and have dry slag from stove, to discharge, the working of a furnace worsens and shortens the continuous production cycle of stove, and causes the product alloy pulverization.
The object of the present invention is to provide a kind of novel process of producing rare earth barium silicide alloy in the hot stove in ore deposit, the rare earth barium silicide alloy composition of this explained hereafter is even, not the rate of recovery height of slag inclusion, not efflorescence, rare earth and barium.Furnace bottom does not have obvious rise in the production process, no slag melting; And can reduce the technology power consumption of alloy production.
Ultimate principle of the present invention is to make the compound of rare earth and barium at first to generate carbide, the slag making reaction of having avoided rare earth and barium compound to contact with silicon-dioxide, and the carbide of rare earth and barium is reduced by silicon monoxide and generates rare earth barium silicide alloy.
Processing step of the present invention is:
1. the powder raw material that will contain rare earth and barium is (85um) with carbonaceous reducing agent (granularity＜0.5mm), binding agent thorough mixing, be higher than the group of making in the briquetting machine of 17MPa at pressure, the fixed carbon add-on of the carbonaceous reducing agent of allocating into is for all to be transformed into REC with rare earth and barium
2And B
aC
2The 1-3 of required theoretical carbon amount times, pelletizing diameter 30～50mm.
2. smelt batching
To contain rare earth and barium raw material pelletizing, silica, carbonaceous reducing agent by following principle preparation batch of material, the ratio of its rare earth metal and barium and silicon is 0.3～0.8, and the amount of allocating into of carbonaceous reducing agent is 0.9～1.0 times that rare earth, barium and silicon compound are reduced to the theoretical metal requirement.
3. the batch of material for preparing is evenly added in the hot stove in ore deposit and smelt.Emitted an alloy every 2 hours and enter tundish, after leaving standstill 5 minutes, pour in the cast iron mold.
The described rare earths material that contains is fluoro-carbon-cerium ore concentrate (REFCO
3), rare earth oxide (RE
xO
y), rare-earth hydroxide (RE (OH)
3), rare earth carbonate (RE
2(CO
3)
3) etc.
Described baric raw material is barite (barium sulfate B
aSO
4), witherite (barium carbonate B
aCO
3) or process white and precipitated barium carbonate.The fluorine carbon cerium type rare earth ore concentrate that contains barium should belong to preferred raw materials.
Described carbonaceous reducing agent is charcoal (wooden unit), coke, coal.The fixed carbon ratio of charcoal and coke (or coal) is 0.1～0.4, also can be only with coke (or coal).
Described coke is metallurgical coke, gas coke, refinery coke, blue carbon (soil is burnt) etc.
Described coal is the raw coal of hard coal, bituminous coal or other pattern.
Described binding agent is spent pulping liquor, water glass or other binding agents.
The present invention adopts the carbonization process of preferential reinforced rare earth and barium, lose the carbon operation in the smelting, show that alloying constituent is even, no slag inclusion through the mine heat furnace smelting test, not efflorescence, the yield that rare earth and barium enter alloy is higher than 95%, and the technology power consumption of rare earth barium silicide alloy per ton is lower than 9500kwh, and no slag is smelted continuously, furnace bottom does not have obvious rise, and the present invention provides reliable process for industrial implementation.
The technology contents that the invention is further illustrated by the following examples.
Example 1: use main chemical compositions to be ∑ REO61.5%, B
aThe baric fluorine carbon cerium type rare earth ore concentrate of O9.6%, 550-750 ℃ of roasting temperature 1～1.5 hour, adopt 200 kilograms of roasted ores, 21 kilograms of wood charcoal powders, 32 kilograms of batchings of low ash coal powder add 27 kilograms of spent pulping liquors, fully stir, mix, then in the pair roller type pelletizer, with greater than 17MP
aPressure is made ball, and drying obtains rare earth barium pelletizing.According to 200 kilograms in silica, 125 kilograms of rare earth barium pelletizings, gas coke 69Kg, metallurgical coke 37Kg, the batching charge that charcoal is 15 kilograms, the ratio of batching middle-weight rare earths metal and barium and silicon is 0.61.Add in the hot stove in 7000KVA ore deposit and smelt, the utmost point heart garden diameter of phi 2000mm of this hot stove in ore deposit, self baking electrode diameter of phi 740mm, primary side voltage 10000V, operating voltage 105V, electrode insert the furnace charge degree of depth 1200～1500mm.Furnace charge is loose, burns with anger evenly, the material that collapses, smashes material easily, emits alloy once in 2 hours at interval, and the inflow tundish leaves standstill and poured in the cast iron mold in 5 minutes.Smelt the typical chemical ingredients RE 25～27% of the alloy that, S
i53～57%, B
a6～8%.
Example 2: use main chemical compositions to be ∑ REO44%, B
a200 kilograms in rare earth barium concentrate is adopted in the baric fluorine carbon cerium mischmetal ore deposit of O21.2%, 46 kilograms in coke powder, and (40%) 26 kilogram of water glass mixes, makes ball, drying by example 1 method, makes rare earth barium pelletizing.Adopt 200 kilograms in silica, rare earth barium pelletizing 120 kg, 95 kilograms in coal, 10 kilograms of batchings of charcoal charges add in the hot stove in ore deposit identical with example 1 and smelt, and making the typical chemical ingredients of rare earth barium silicide alloy is RE19～21%, B
a7～8%, S
i55～60%.
Example 3: adopt rare earth oxide (∑ REO 95%), barite powder (B
aSO
494%), according to 100 kilograms of rare earth oxides, 117 kilograms of barite powders, 53 kilograms in coke powder, 25 kilograms of spent pulping liquors mix, make ball, drying by example 1 way, make rare earth barium pelletizing.Adopt 200 kilograms in silica, 84 kilograms of rare earth barium pelletizings, 97 kilograms of blue charcoals, 11 kilograms of batchings of charcoal charge, add in the hot stove in 3000KVA ore deposit and smelt hot stove utmost point heart garden, this ore deposit diameter of phi 1520mm, self baking electrode diameter of phi 630mm, primary side voltage 10000V, operation secondary voltage 84V, electrode inserts the furnace charge degree of depth 900～1000mm, and charge level is ventilative good, collapse material evenly, at interval emitted an alloy in 2 hours and go into tundish, leave standstill 5 minutes after, pour in the cast iron mold.Producing the alloy typical composition is: RE15～17%, B
a13～15%, S
i50～57%.
Technology of the present invention is smelted the rare earth barium silicide alloy that, through chemico-analytic chemical ingredients is: RE10～35%, B
a5～15%, S
i45～60%, C
a＜3%, Al＜1.5%, T
i＜0.2%, surplus is an iron.
Claims (5)
1. a carbothermic reduction rare earth, barium and silicon raw material are produced rare earth barium silicide alloy technology, it is characterized in that processing step is:
1) will contain the powder raw material of rare earth and barium and carbonaceous reducing agent powder, binding agent thorough mixing, pressure greater than the group's of making machine of 17MPa in the group of making, make rare earth barium pelletizing.The fixed carbon add-on of the carbonaceous reducing agent of allocating into is that rare earth and barium all change REC into
2, B
aC
2The 1-3 of required theoretical carbon amount times, pelletizing diameter 30～50mm.
2) batching
By following principle batching, the ratio of its rare earth metal and barium and silicon is 0.3～0.8 with rare earth barium pelletizing, silica, carbonaceous reducing agent, and the amount of allocating into of carbonaceous reducing agent is 0.9～1.0 times that rare earth, barium and silicon compound are reduced to the required theoretical carbon amount of metal.
3) batch of material for preparing is evenly gone in the hot stove in ore deposit to smelt, every about two hours, emit alloy and once go into tundish, leave standstill and poured in the cast iron mold in 5 minutes.
2. technology according to claim 1 is characterized in that described rare earths material is a bastnaesite concentrate, rare earth oxide, rare-earth hydroxide and rare earth carbonate etc.; Described baric raw material is barite, witherite or precipitated barium carbonate and process white; Hamartite and barite mineral intergrowth concentrate should belong to preferred raw materials.
3. technology according to claim 1 is characterized in that described carbonaceous reducing agent is coke, coal and charcoal (wooden unit), and the fixed carbon ratio of its charcoal and coke (or coal) is 0.1～0.4, also can be only with coke or coal.
4. according to the described technology of claim 3, it is characterized in that described coke is metallurgical coke, gas coke, refinery coke, blue charcoal (soil is burnt) etc., described coal is the raw coal of hard coal, bituminous coal or other pattern.
5. according to the described technology of claim 1, it is characterized in that described binding agent is spent pulping liquor, water glass etc.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98121072A CN1093564C (en) | 1998-12-16 | 1998-12-16 | Technology for producing rare earth barium silicide alloy by carbon thermal reduction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98121072A CN1093564C (en) | 1998-12-16 | 1998-12-16 | Technology for producing rare earth barium silicide alloy by carbon thermal reduction method |
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| Publication Number | Publication Date |
|---|---|
| CN1257131A true CN1257131A (en) | 2000-06-21 |
| CN1093564C CN1093564C (en) | 2002-10-30 |
Family
ID=5226985
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN98121072A Expired - Fee Related CN1093564C (en) | 1998-12-16 | 1998-12-16 | Technology for producing rare earth barium silicide alloy by carbon thermal reduction method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101298642B (en) * | 2008-06-16 | 2010-04-14 | 东北大学 | Method for preparing titanium-aluminum-silicon alloy by carbothermal reduction method |
| CN1511966B (en) * | 2002-12-30 | 2011-06-08 | 北京有色金属研究总院 | Ore dressing process for rare earth crude ore with high iron content |
| CN104894033A (en) * | 2015-06-25 | 2015-09-09 | 湖北凌卓生物工程有限公司 | Compound microbial inoculant for degrading COD (chemical oxygen demand) and preparation method of compound microbial inoculant |
| CN107002169A (en) * | 2014-12-09 | 2017-08-01 | 埃尔凯姆有限公司 | For the integrated approach for the Energy Efficient for producing metal or alloy |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1025052C (en) * | 1992-10-27 | 1994-06-15 | 东北工学院 | Process for preparation of rareearth ferro-silicon alloy by carbon thermal reduction to ore bearing O,C and Ce |
-
1998
- 1998-12-16 CN CN98121072A patent/CN1093564C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1511966B (en) * | 2002-12-30 | 2011-06-08 | 北京有色金属研究总院 | Ore dressing process for rare earth crude ore with high iron content |
| CN101298642B (en) * | 2008-06-16 | 2010-04-14 | 东北大学 | Method for preparing titanium-aluminum-silicon alloy by carbothermal reduction method |
| CN107002169A (en) * | 2014-12-09 | 2017-08-01 | 埃尔凯姆有限公司 | For the integrated approach for the Energy Efficient for producing metal or alloy |
| US10392678B2 (en) | 2014-12-09 | 2019-08-27 | Elkem Asa | Energy efficient integrated process for production of metals or alloys |
| CN104894033A (en) * | 2015-06-25 | 2015-09-09 | 湖北凌卓生物工程有限公司 | Compound microbial inoculant for degrading COD (chemical oxygen demand) and preparation method of compound microbial inoculant |
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| Publication number | Publication date |
|---|---|
| CN1093564C (en) | 2002-10-30 |
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