CN1303233C - Iron-extraction process ferro-tungsten production using schellite, tungsten waste and iron ore as raw material - Google Patents
Iron-extraction process ferro-tungsten production using schellite, tungsten waste and iron ore as raw material Download PDFInfo
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- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 title claims abstract description 78
- 229910052721 tungsten Inorganic materials 0.000 title claims abstract description 76
- 239000010937 tungsten Substances 0.000 title claims abstract description 76
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 51
- 239000002994 raw material Substances 0.000 title claims abstract description 47
- 229910001145 Ferrotungsten Inorganic materials 0.000 title claims abstract description 42
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 31
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 25
- 239000002699 waste material Substances 0.000 title claims abstract description 19
- 238000000605 extraction Methods 0.000 title claims description 4
- 239000002893 slag Substances 0.000 claims abstract description 31
- 238000007670 refining Methods 0.000 claims abstract description 24
- 229910045601 alloy Inorganic materials 0.000 claims description 11
- 239000000956 alloy Substances 0.000 claims description 11
- 229910052698 phosphorus Inorganic materials 0.000 claims description 7
- 229910052785 arsenic Inorganic materials 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 5
- 238000007865 diluting Methods 0.000 claims description 4
- 229910052717 sulfur Inorganic materials 0.000 claims description 4
- 230000000779 depleting effect Effects 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 239000012535 impurity Substances 0.000 abstract description 13
- 239000000571 coke Substances 0.000 abstract description 10
- 239000000463 material Substances 0.000 abstract description 9
- 230000008901 benefit Effects 0.000 abstract description 6
- 229910000519 Ferrosilicon Inorganic materials 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 238000009412 basement excavation Methods 0.000 abstract description 2
- 239000004575 stone Substances 0.000 abstract 2
- 238000000034 method Methods 0.000 description 28
- 230000008569 process Effects 0.000 description 22
- 239000010426 asphalt Substances 0.000 description 8
- 239000012141 concentrate Substances 0.000 description 7
- 239000007788 liquid Substances 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 5
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- ZXOKVTWPEIAYAB-UHFFFAOYSA-N dioxido(oxo)tungsten Chemical compound [O-][W]([O-])=O ZXOKVTWPEIAYAB-UHFFFAOYSA-N 0.000 description 4
- 239000011574 phosphorus Substances 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- AHIVCQLQCIBVOS-UHFFFAOYSA-N [Fe].[W] Chemical compound [Fe].[W] AHIVCQLQCIBVOS-UHFFFAOYSA-N 0.000 description 3
- 239000001506 calcium phosphate Substances 0.000 description 3
- 229910000389 calcium phosphate Inorganic materials 0.000 description 3
- 235000011010 calcium phosphates Nutrition 0.000 description 3
- 238000010891 electric arc Methods 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000005485 electric heating Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
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- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 235000012255 calcium oxide Nutrition 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- 235000012241 calcium silicate Nutrition 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
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- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
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- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The present invention discloses an iron-extracting method for producing ferrotungsten by using scheelite, tungstenic waste materials and iron stone as raw materials. Circulating production is carrying out from furnace material grouping, electric stove preheating, material feeding, fine refining, ferrotungsten excavation, slag depletion, deslagging, electric pole discharge to material feeding and fine refining. 70 to 80% of scheelite and 20 to 30% of tungstenic waste material are mixed with the iron stone to form a furnace feeding material containing 50 to 66% of WO3 and 10 to 18% FeO, and the putting amount of the furnace feeding material is controlled in segments. Thus, tungsten resources can be widely used, ore dressing cost and production cost are obviously reduced, and the present invention has good social and economic benefits. Wolfram sub ores and wolfram materials are added after the ferrotungsten is excavated and coke ferrosilicon is added to carry out depletion, which enables a large quantity of impurity elements to be discharged by following slag before the ferrotungsten is excavated through circulating production. Thus, the optimum impurity removing effect is achieved.
Description
The technical field is as follows:
the invention relates to a ferrotungsten production process, in particular to a process for producing ferrotungsten by taking scheelite, tungsten-containing waste and iron ore as raw materials through an iron taking method.
Background art:
since the introduction of the original Su-Union electric heating furnace iron-taking process in the fifty years of the twentieth century, the production of ferrotungsten in China can only use black tungsten concentrate of the first class of national standard as a raw material all the time. With the gradual depletion of black tungsten resources accounting for less than 30 percent of the total proportion in China, white tungsten resources accounting for more than 70 percent are not fully utilized, and how to fully and effectively utilize most of the white tungsten resources is a necessary way for the exploration and development of the tungsten industry. Scheelite has been partially used in the acid decomposition process of hydrometallurgy in recent years, but has overlarge corrosion to equipment and environmental pollution in the production process. The scheelite is used for producing ferrotungsten by pyrometallurgy, and research has been carried out on ferrotungsten production units; the scheelite is tried out as a raw material, and the ferro-tungsten is produced by adopting an iron taking method, so that no successful case exists; the tungsten produced by the agglomeration method and the tungsten produced by the out-of-furnace method can only be mixed with a small amount of particularly good white tungsten concentrate and black tungsten concentrate, and in the various methods for producing ferrotungsten by using the white tungsten ore, the recovery rate of tungsten is low, the content of impurities in the product is high, various energy consumptions are high, and the product quality is very unstable.
The invention content is as follows:
the technical problem to be solved by the invention is as follows: aiming at the defects of the prior art, the iron extraction method for producing the ferrotungsten by taking the scheelite, the tungsten-containing waste and the iron ore as raw materials can be used for widely expanding the utilization rate of tungsten resources and obviously reducing the mineral separation cost and the smelting production cost.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the iron-taking method for producing ferrotungsten by using scheelite, tungsten-containing waste and iron ore as raw material includes charging material batch, electric furnace preheating,The production method comprises the following cyclic production steps of feeding and refining, digging ferrotungsten, diluting slag, deslagging and discharging electrodes, and feeding and refining, and is characterized in that: the charge material batch is prepared by mixing 70-80 wt% of scheelite and 20-30 wt% of tungsten-containing waste and iron ore to obtain a mixture containing WO350-66% of tungsten raw material and 10-18% of FeO; the input amount of the tungsten raw material in the feeding refining is 30-50% of the tungsten raw material which is added in a production period, the distance from the slag surface in the furnace to the ferrotungsten alloy layer is kept at 30-60cm, the temperature during refining is 3000-5500 ℃, and the refining time is 120-150 minutes; between the steps of digging ferro-tungsten and depleting slag, 50-70% of the tungsten raw material to be added in a production period is put into the furnace.
And between the step of digging ferro-tungsten and the step of diluting slag, non-standard tungsten ore is put into the furnace.
The tungsten raw material contains less than or equal to 0.9 percent of S, less than or equal to 0.05 percent of P, less than or equal to 0.12 percent of Cu and less than or equal to 0.15 percent of As.
Compared with the prior art, the invention has the advantages that: on the basis of the traditional process equipment, beneficial element components of the wolframite concentrate are imitated, the raw materials entering the furnace are prepared into artificial wolframite by mixing scheelite, tungsten-containing waste and iron ore, and the artificial wolframite is smelted, the recovery rate of tungsten is more than 96.5 percent and is not lower than that of the traditional process, the process flow is short, the production is easy to master, the tungsten resources can be widely utilized, the mineral separation cost and the production cost are obviously reduced, and good social benefit and economic benefit are achieved; before the ferrotungsten is dug and extracted in the refining process, partial tungsten raw materials are put into the production cycle, the slag surface depth is controlled, the electrode arc is effectively close to the ferrotungsten alloy layer, the refining time can be shortened, the electric energy consumption is reduced, and the using amount of the ferrotungsten scooping spoon can be saved; after the ferrotungsten is dug, non-standard tungsten ore and the rest tungsten raw material are added, and after the ferrosilicon coke is added and diluted, a large amount of impurity elements can be discharged along with slag before the ferrotungsten is dug and extracted in the circulating production, so that the optimal impurity removal effect is achieved; meanwhile, the melting point of calcium phosphate generated by the interaction of calcium in the scheelite and phosphorus in the tungsten raw material is lower than that of ferrotungsten, so that the phosphorus impurities which are difficult to treat are discharged along with slag liquid in a calcium phosphate liquid state.
The technological process and the reaction principle of the invention are as follows:
the invention is based on the conventional electric heating furnace iron-taking method which takes the black tungsten concentrate as the raw material to produce the ferrotungsten, and takes the scheelite, the tungsten-containing waste and the iron ore as the raw materials. The capacity of a common electric arc furnace is generally 1500KAV-3600 KAV. The capacity of an electric arc furnace used in the following process is 3600KAV, 8 hours is a production period, and the total tungsten raw material fed into the furnace is 10 tons.
1. Furnace charge batching:
mixing 70-80% of scheelite, including concentrate and non-standard ore, 20-30% of tungsten-containing waste material, including waste tungsten carbide and waste alloy, and other tungsten-containing waste material, with iron ore mechanically to obtain WO350-66 percent of tungsten raw material, 10-18 percent of FeO, less than or equal to 0.05 percent of P, less than or equal to 0.12 percent of Cu, less than or equal to 0.15 percent of As, less than or equal to 0.9 percent of S and unlimited content of other impurity elements, and packaging the tungsten raw material into a bag of 50 kg.
2. Preheating an electric furnace:
in order to avoid that the tungsten raw material is not completely decomposed and difficult to form alloy due to low furnace temperature, an electric furnace is preheated before the tungsten raw material is added, the temperature of the furnace body is increased, considering that a furnace lining expands after the furnace body is heated, intermittent power transmission is adopted in the early stage in the heating process, the voltage is 190 volts, the current is gradually increased from 3000 amperes of 2000 + and 170 volts, the continuous power transmission is carried out in the later stage, the voltage is 150 + and 170 volts, the current is gradually increased from 8500 amperes to full-load operation, meanwhile, the temperature of a furnace bottom shell is observed, and when the temperature of the shell at the bottom of the furnace body reaches 80 ℃, the tungsten raw material adding process can be carried out.
The electric furnace preheating is a process when the ignition is performed for the first time after the furnace shutdown. And (4) entering a normal cycle production stage, directly feeding and refining after diluting and deslagging, and not needing to preheat an electric furnace.
3. Feeding and refining:
when the preheating temperature of the electric furnace reaches the standard or after the electric furnace is depleted and deslagging, 190V voltage is used for power transmission, the current is gradually increased from small to large in stability to rated full load. In order to facilitate power transmission, 200-400 Kg of cold burden can be added firstly, after the current is stable and the electrode is exposed, the tungsten raw material is thrown into the furnace for each time and cannot exceed 250Kg, and a small amount of steel scraps and iron-containing substances are combined and uniformly added into the furnace on the principle that the material is thrown into the furnace for a small amount of times. The feeding is not suitable to be too fast in the refining period, the slag surface in the furnace is required to be boiled every time of feeding, and sometimes the slag liquid in the furnace is found to be boiling, which is the point of melting and dissolving of cold and hard substances in the furnace, the feeding is required to be carried out after the slag liquid is turned over and falls back. The tungsten raw material input in the stage is 3-5 tons; meanwhile, the depth of a proper amount of slag surface is controlled, and the slag surface is preferably 30-60cm to the ferrotungsten alloy layer.
After the charging is finished and when the electrode is exposed to the arc, the voltage of 150 plus 170V is changed, and the rated full-load power transmission is used for refining. The refining can remove harmful impurities such as silicon, manganese, sulfur, arsenic, phosphorus and the like in the alloy, so that the quality of the ferrotungsten alloy reaches the standard, a proper amount of asphalt coke is used for covering an electric arc during the refining, the semi-arc-shaped electrode is kept in an arc-shaped exposed state, and the ferrotungsten digging process is carried out, wherein the asphalt coke amount is 30 percent of the total asphalt coke addition amount, and the total asphalt coke addition amount is as follows: 5-7 kg of asphalt coke is added into each 100 kg of tungsten raw material.
4. Digging tungsten iron:
when the refining time reaches more than 120 minutes and the slag surface in the furnace is in a fluctuating boiling state, the ferrotungsten alloy is tried to be excavated, and is firstly soaked in water to emit green flame, then the surface is corrugated, the back surface is provided with pits, the section is made of steel gray, the section structure is columnar and crystalline, and the fracture is smooth. The tungsten iron is qualified and can be dug. Otherwise, refining is continued, and the furnace condition is adjusted in time. After the iron digging is normal, the current can be properly reduced by 20-30%, and the ferro-tungsten is dug according to the proportion that the added tungsten raw material is 1.5: 1 in the production cycle. And sending the dug ferrotungsten to a finishing workshop for grinding and polishing, and crushing the ferrotungsten into particles meeting the specification according to the requirements of customers. Packaging and leaving factory after comprehensive analysis is qualified.
5. Throwing non-standard ore:
in order to exert the best impurity removal effect and expand the range of tungsten raw materials, non-standard tungsten ore can be added into the furnace, the rest part of the tungsten raw materials, namely 5 to 7 tons, is added in the production period, and meanwhile, the tungsten raw material dust collected in the process and the feeding refining process is added into the furnace after arsenic, copper and phosphorus are removed. The impurities contained in the slag canbe discharged with the slag through depletion so as to reduce the content of the tungsten iron entering the next excavation.
6. Slag depletion:
by depletion is meant that the charge in the furnace, tungsten and slag, are largely separated, WO in the slag being stipulated by the relevant standards3The content should be less than 0.5%. Except for tungsten and iron, the tungsten raw material can also contain silicon, calcium, manganese, oxygen and other impurities in different equal parts, and the tungsten and the slag are separated by lifting and sinking in the smelting process under the action of high temperature according to different melting points and different densities of the tungsten and the iron. In order to accelerate the separation speed and improve the separation effect, a proper amount of asphalt coke is alternately added during the period, and the ferrosilicon helps the reduction reaction:
(1)
(2)
(3)
(4)
(5)
(6)
when the furnace temperature reaches 3000 ℃, impurities such as silicon dioxide, calcium silicate, calcium oxide, calcium phosphate and the like are all in a liquid state in the furnace, tungsten and iron form an alloy which sinks to the bottom of the furnace with high specific gravity, and an analysis layer is formed in the furnace. And sampling, cooling and observing, wherein when the surface of the slag is glossy and is yellow brown, green or white, and the illumination is transparent so as to meet the depletion requirement.
Wherein the addition amount of the ferrosilicon is as follows: adding 8-10 kg ferrosilicon into 100 kg tungsten raw material; the addition amount of the asphalt coke is 70 percent of the total addition amount of the asphalt coke.
7. Deslagging and discharging electrodes:
when the slag is depleted and qualified, the furnace is poured out and the slag is poured out, the upper liquid body is poured out of the furnace, and the lower layer of ferrotungsten alloy is left at the bottom of the furnace, so that the aim of separating tungsten from the slag is fulfilled. And after the furnace is turned over and slag is removed, the furnace is placed to an electrode with the length of 1.8 to 2 meters below a copper tile, and then the furnace is placed to a feeding refining stage for circular production.
Description of the drawings:
FIG. 1 is a process flow diagram of an embodiment of the invention.
The specific implementation mode is as follows:
1. requirements for tungsten feedstock: the wolframite concentrate used in the conventional process, the scheelite used in the present invention, the tungsten-containing waste and the iron ore, are shown in Table 1:
TABLE 1 requirements of conventional Process and invention on tungsten feedstock (unit:%)
Therefore, the tungsten raw material used in the invention has low grade and wide impurity element range, can not only widely utilize tungsten resources, but also remarkably reduce the beneficiation cost and the production cost, and has good social benefit and economic benefit.
2. The contents of tungsten raw materials selected by the conventional process and the embodiment of the invention are as follows, and are shown in table 2:
TABLE 2 content of tungsten raw material selected in the present invention (unit:%)
3. The content of the raw materials used in the conventional process is compared with the product produced by the present invention using the above raw materials, and is shown in Table 3:
TABLE 3 comparison of the content of the product produced by the conventional process and the present invention (unit:%)
The comprehensive recovery rate of tungsten in the ferrotungsten production process is 96.5 percent, which is about 0.5 percent higher than that of the traditional process.
Claims (3)
1. The iron-taking method for producing the ferrotungsten by taking the scheelite, the tungsten-containing waste and the iron ore as raw materials comprises the steps of furnace charge batching, electric furnace preheating, feeding refining, ferrotungsten digging, slag depletion, slag dumping discharge electrode and feeding refining circulation production, and is characterized in that: in the furnace charge batch, 70-80% of scheelite and 20-30% of tungsten-containing waste material and iron ore are mixed to form the mixture containing WO350-66% of tungsten raw material and 10-18% of FeO; the input amount of the tungsten raw material in the feeding refining is 30-50% of the tungsten raw material which is added in a production period, the distance from the slag surface in the furnace to the ferrotungsten alloy layer is kept at 30-60cm, the temperature during refining is 3000-5500 ℃, and the refining time is 120-150 minutes; between the steps of digging ferro-tungsten and depleting slag, 50-70% of the tungsten raw material to be added in a production period is put into the furnace.
2. The iron-taking method for producing ferrotungsten by taking scheelite, tungsten-containing waste and iron ore as raw materials according to claim 1, which is characterized in that: and between the step of digging ferro-tungsten and the step of diluting slag, non-standard tungsten ore is put into the furnace.
3. The iron extraction method for producing ferrotungsten by using scheelite, tungsten-containing waste and iron ore as raw materials according to claim 1 or 2, which is characterized in that: the tungsten raw material contains less than or equal to 0.9 percent of S, less than or equal to 0.05 percent of P, less than or equal to 0.12 percent of Cu and less than or equal to 0.15 percent of As.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU550429A1 (en) * | 1975-11-12 | 1977-03-15 | Уральский научно-исследовательский институт черных металлов | The method of smelting ferroalloys |
| CN1113962A (en) * | 1994-06-24 | 1995-12-27 | 攀枝花钢铁（集团）公司钢铁研究院 | Method for smelting ferrotungsten |
| CN1483844A (en) * | 2002-09-16 | 2004-03-24 | 郴州市金龙铁合金有限公司 | Method for smelting ferro-tungsten by using scheelite preparation concentrate |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU550429A1 (en) * | 1975-11-12 | 1977-03-15 | Уральский научно-исследовательский институт черных металлов | The method of smelting ferroalloys |
| CN1113962A (en) * | 1994-06-24 | 1995-12-27 | 攀枝花钢铁（集团）公司钢铁研究院 | Method for smelting ferrotungsten |
| CN1483844A (en) * | 2002-09-16 | 2004-03-24 | 郴州市金龙铁合金有限公司 | Method for smelting ferro-tungsten by using scheelite preparation concentrate |
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| CN1710120A (en) | 2005-12-21 |
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