CN1003865B - Smelting of rare earth fine ore briquettes (or lumps) to prepare rare earth fine slag and niobium ferric phosphorate - Google Patents
Smelting of rare earth fine ore briquettes (or lumps) to prepare rare earth fine slag and niobium ferric phosphorate Download PDFInfo
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- CN1003865B CN1003865B CN85103967.7A CN85103967A CN1003865B CN 1003865 B CN1003865 B CN 1003865B CN 85103967 A CN85103967 A CN 85103967A CN 1003865 B CN1003865 B CN 1003865B
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Abstract
The present invention relates to an ore furnace of rare earth concentrate briquettes (or lumps) for preparing rare earth concentrate slag and ferro-phosphorus with niobium. The present invention belongs to the raw material pretreatment. The present invention provides an ore furnace for rare earth concentrate briquettes (or lumps) in order to solve the problem for preparing the raw material of rare earth master alloy with high rare earth and low titanium. Coke is used as a reducing agent, silica is used as a slagging agent for reducing smelting. Rare earth concentrate slag is economically and reasonably prepared, and the byproduct of ferro-phosphorus with niobium is simultaneously produced. The present invention provides ideal raw material for preparing the rare earth master alloy with a silicothermic method.
Description
The present invention relates to the smelting process of a kind of rare earth concentrate pellet (or piece) ore heat furnace preparation rare-earth extract slag and ferrophosphorus.
The external raw material of generally producing rare earth intermediate alloy is rare earth oxide (" chemical abstracts " " CA ", on January 10th, 1972,76 2 phases of volume, 7703 pages) and rare earth oxide (" changing the number digest " " CA ", on January 24th, 1972,76 4 phases of volume, 16887 pages).But because these raw material costlinesses account for 80% of product cost, so cause cost of alloy to improve.
Baotou, domestic Inner Mongol east wind Steel Plant and Baotou Iron and Steel Company's rare earth two factories now adopt and contain rare earth oxide (RE
2O
3) poor iron ore in 9～12%, adding coke and lime stone and go into the blast furnace reducing and smelting, deferrization dephosphorization gained rare earth slag is raw material (its composition is listed in table 1).This kind rare earth slag raw material is domestic does not formulate standard as yet, only requires slag middle-weight rare earths oxide compound (RE
2O
3) content can use greater than 12%.Again because this slag contains the lower (RE of rare earth oxide
2O
310～13%), can only produce the rare earth intermediate alloy that contains rare earth metal (RE) 20～30% with silicothermic process.Want to produce that to contain the rare earth intermediate alloy of rare earth metal (RE) more than 30% be very difficult, and contain titanium in the alloy (Ti) content height.
Applicant of the present invention one iron clad rare earth-factory once adopted the rare earth ore concentrate powder really to insert electric arc furnace to add coke and ferrosilicon smelting, deferrization dephosphorization gained refined re ore slag is that the hot legal system of raw material (its one-tenth is respectively in table 2) available silicon is got the low titanium master alloy (contain rare earth metal (RE) greater than 30%, titanium (Ti) is less than 1%) of high rare earth (belonging to our unit's restricted data).But this method electric arc furnace is naked arc operation, the serious etch of furnace lining material under the high temperature, and lining life has only 3～4 days, and production efficiency is low, and technico-economical comparison is unreasonable.
Purpose of the present invention is exactly the weak point at above-mentioned existence, proposition is that raw material is gone into the hot stove in ore deposit with rare earth concentrate pellet (or piece), is reductive agent with the coke, and silica is a slag former, iron in the rare earth ore concentrate is separated with phosphorus as far as possible, prepare qualified refined re ore slag and ferrophosphorus economically.
The present invention is achieved in that to contain rare earth oxide (RE
2O
3) 30～60% rare earth concentrate pellet (or piece) is raw material, coke is a reductive agent, and silica is a slag former, and reducing and smelting is produced the high-quality refined re ore slag in the hot stove in ore deposit, pays the product ferrophosphorus simultaneously.
The furnace charge technical qualification are:
1. rare earth concentrate pellet (or piece) main chemical compositions (%); Rare earth oxide (RE
2O
3) 30～60; Vanadium Pentoxide in FLAKES (P
2O
5) 6～8; Full iron (TFe) 10～4; Fluorine (F) 12～6.
Granularity φ 10～25mm,
Fine ore is greater than 10%
30～50 kilograms/ball of intensity.
2. also refer to agent-coke
Fixed carbon C is greater than 82%; Ashes is less than or equal to 17%,
Granularity 3～15mm, moisture is less than 5%.
3. slag former-silica
Silicon-dioxide (SiO
2) greater than 97%, granularity 5～30mm.
Batching is 100 with rare earth concentrate pellet (or piece), decomposites the needs of Vanadium Pentoxide in FLAKES with addition of silica according to phosphatic content in the mineral composition and promotion; The add-on of coke is pressed in the concentrate and can be calculated by charcoal reductive oxide compound.Content according to full iron and Vanadium Pentoxide in FLAKES in the refined re ore slag is adjusted proportioning with Theoretical Calculation and rule of thumb data combination, and charge composition is:
Rare earth concentrate pellet (or piece): coke: silica=100: 9～10: 5～7
Of the present invention is the common worn-out mouthful of hot stove in formula ore deposit, and furnace lining is a carbon refractories, molten certainly electrode.Select the power supply system that suits according to used ore heat furnace transformer amount of capacity.Furnace charge is pressed the proportion speed weighing, and uniform mixing is in the stove of packing into.Little charge, multiple batches of continuous charging mode are adopted in smelting operation, furnace charge reaches the stove central melting and sinks around the hot stove three-phase electrode in the ore deposit, for preventing the furnace lining high temperature oxidation and making full use of electrothermal efficiency, adopt high charge level arc-covering slag operation, it is the three-phase electrode that furnace charge buries the hot stove in ore deposit all the time in the smelting process, and make that the furnace charge face keeps certain cone to become the steamed bun type around the electrode, and forbid naked arc, will give the furnace charge of heat at any time and push to flux around the electrode.Smelting temperature is 1400～1650 ℃, 3～4 hours tap to tap time, regularly comes out of the stove to such an extent that refined re ore slag produces ferrophosphorus with paying.
Slag tap and put iron and carry out simultaneously, slag iron mouth is left in hot stove bottom, ore deposit, the outflow chute, and baking is arranged at the chute bottom, and good slag ladle places on the tank car.When opening slag iron mouth, slag and iron enter in the jar simultaneously in the stove, the back obstruction slag iron mouth that finishes of coming out of the stove, continuous charging, continuous production.Slag car are with the past concentrate workshop of fused slag Railway transportation.Naturally cooling.Because slag, iron proportion great disparity, the iron in the slag sinks complete product rapidly at the bottom of jar.Turn over jar after the cooling, slag iron separates.
The present invention adopts ore deposit hot stove deferrization dephosphorization, and is simple for process, but stable and reliable product quality industrialization continuous production.Arc-covering slag operation prevents the etch of fire proof material of furnace lining, prolongs furnace lining work-ing life more than 1 year.And use electric arc furnace deferrization dephosphorization is naked arc operation, because fierce oxidation of high temperature and chemical etching are serious, causes lining life to have only 3～4 days, consumes a large amount of refractory materialss, often repaiies stove, and production operational availability is very low.Replace the electric arc furnace silicothermic process with the hot method of the hot stove charcoal in ore deposit, produce refined re ore slag and ferrophosphorus, reduced product cost, improved economic benefit with cheap silica.Especially silica dephosphorization effect in the hot stove in ore deposit is better, can make in the refined re ore slag that phosphorus pentoxide content is stable reduces to below 0.5%, makes raw material with this slag and can satisfy the requirement of producing rare earth intermediate alloy.
Embodiment (1):
To contain rare earth oxide (RE
2O
3) 100 kilograms of 32.5% rare earth concentrate pellets (or piece), 9 kilograms in coke, 5 kilograms in silica, evenly batch mixing in worn-out mouthful of hot stove in formula ore deposit of the 400KVA that in batches packs into, send electric smelting, and voltage is 60 volts; The beginning current control is 3000 amperes; With the furnace charge fusing, electric current is enlarged to 3600 amperes gradually.Smelting temperature is about 1500 ℃.The working of a furnace normally back adopts little charge, and multiple batches of continuous charging will give the furnace charge of heat at any time and push to around the electrode, make furnace charge keep certain cone to become the steamed bun type around three-phase electrode, forbid naked arc to be operated.3.5 hours tap to tap time, the back slag iron of coming out of the stove is because of the proportion difference, natural separation, sampling analysis, finishing packing.
Embodiment (2):
To contain rare earth oxide (RE
2O
3) 100 kilograms of 40.0% rare earth concentrate pellets (or piece), 10 kilograms in coke, 7 kilograms in silica, evenly batch mixing divides in example (1) used smelting equipment, by above-mentioned same program with same operational condition obtains refined re ore slag and the ferrophosphorus chemical ingredients is listed in table 3 and table 4.
In poor iron ore go into the main chemical constitution of blast furnace rare earth slag table 1
The rare earth ore concentrate powder is directly into the main chemical constitution of electric arc furnace rare earth slag table 2
Rare earth concentrate pellet (or piece) is gone into the main chemical constitution of the hot stove refined re ore slag in ore deposit table 3
The main chemistry of ferrophosphorus becomes table 4
Claims (3)
1, a kind of smelting process of producing the refined re ore slag that rare earth intermediate alloy uses that provides is characterized in that to contain rare earth oxide (RE
2O
3) 30～60% rare earth concentrate pellet (or piece) is raw material, adds coke and silica directly into the hot stove in ore deposit, reducing and smelting, its charge composition is:
Rare earth concentrate pellet (or piece): coke: little charge, multiple batches of continuous charging mode are adopted in silica=100: 9～10: 5～7, high charge level arc-covering slag operation, smelting temperature: 1400～1650 ℃, tap to tap time: 3～4 hours, regularly come out of the stove refined re ore slag, pay the product ferrophosphorus simultaneously.
2, smelting process according to claim 1 is characterized in that said high charge level arc-covering slag operation is furnace charge to be buried all the time the three-phase electrode of the hot stove in ore deposit in smelting process, and makes that the furnace charge face keeps certain cone to become the steamed bun type around the electrode, forbids naked arc.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85103967.7A CN1003865B (en) | 1985-05-21 | 1985-05-21 | Smelting of rare earth fine ore briquettes (or lumps) to prepare rare earth fine slag and niobium ferric phosphorate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85103967.7A CN1003865B (en) | 1985-05-21 | 1985-05-21 | Smelting of rare earth fine ore briquettes (or lumps) to prepare rare earth fine slag and niobium ferric phosphorate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85103967A CN85103967A (en) | 1986-09-03 |
| CN1003865B true CN1003865B (en) | 1989-04-12 |
Family
ID=4793557
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN85103967.7A Expired CN1003865B (en) | 1985-05-21 | 1985-05-21 | Smelting of rare earth fine ore briquettes (or lumps) to prepare rare earth fine slag and niobium ferric phosphorate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1003865B (en) |
Families Citing this family (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 |
| KR101450658B1 (en) * | 2012-11-20 | 2014-10-21 | 한국지질자원연구원 | Enrichment of rare earth oxide with smelting reduction process |
| AU2017257514B2 (en) * | 2016-04-26 | 2021-11-04 | Mintek | Processing of iron-rich rare earth bearing ores |
| CN109837385A (en) * | 2019-04-15 | 2019-06-04 | 李洪明 | A kind of method that Rare Earth Mine is decomposed in heating melting conversion |
| CN111041332A (en) * | 2019-12-23 | 2020-04-21 | 包头稀土研究院 | Rare earth niobium-titanium-iron alloy and production method and use method thereof |
-
1985
- 1985-05-21 CN CN85103967.7A patent/CN1003865B/en not_active Expired
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| Publication number | Publication date |
|---|---|
| CN85103967A (en) | 1986-09-03 |
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