Method for smelting ferro-tungsten by using scheelite headings

A ferro-tungsten and concentrate technology, which is applied in the field of smelting ferro-tungsten, can solve the problems of excessive inert slag in the slag, production efficiency of ferro-tungsten that cannot be taken out of the furnace, and difficulties in the source of raw materials for ferro-tungsten smelting.

Inactive Publication Date: 2006-06-14
郴州市金龙铁合金有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0035] The purpose of the present invention is to provide a method for smelting ferro-tungsten with scheelite concentrate, which can overcome the reduction reaction in the process of smelting ferro-tungsten with scheelite concentrate, which reduces the amount of ferro-tungsten and is enriched in furnace bottom and slag due to high tungsten grade. A series of problems such as excessive inert slag, insufficient heat, high alkalinity in the furnace charge reactants, inability to take out ferro-tungsten from the furnace, and low production efficiency have solved the long-standing problem of difficult sources of raw materials for ferro-tungsten smelting, reducing production costs and simplifying the production process. Purpose of process operating procedures

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  • Method for smelting ferro-tungsten by using scheelite headings
  • Method for smelting ferro-tungsten by using scheelite headings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The product that this embodiment produces is iron tungsten FeW80-A

[0048] 1. Production site

[0049] The factory site of this embodiment is located in Maqiao Township, Rucheng County, Hunan Province, and the factory covers an area of ​​8000m 2 .

[0050] 2. Production equipment

[0051]The main equipment includes: a tiltable three-phase open electric furnace, a transformer with a capacity of 3500kVA, the electrodes are self-baking electrodes, and the electrodes are fixed with pneumatic spring clamping grippers. The shell is welded by 20mm thick steel plate. The whole furnace is placed on two semicircular rollers, and the tilt of the furnace is controlled by the lifting of the hydraulic cylinder to release the depleted slag. There is a feeding bin above the exhaust hood of the furnace, and the scheelite concentrate charge is fed into the furnace by three screw feeders. There is a 1500mm×1500mm×500mm water pool on both sides of the furnace. The hot iron tungsten is...

Embodiment 2

[0065] 1. Production site

[0066] The factory site of this embodiment is located in Sanxing Township, Rucheng County, Hunan Province, and the factory covers an area of ​​5000m 2 .

[0067] 2. Production equipment

[0068] The main equipment includes: a tiltable three-phase open electric furnace, a transformer with a capacity of 3000kVA, the electrode is a self-baking electrode, and the electrode is fixed with a pneumatic spring clamping gripper. The shell is welded by 20mm thick steel plate. The whole furnace is placed on two semicircular rollers, and the tilt of the furnace is controlled by the lifting of the hydraulic cylinder to release the depleted slag. There is a feeding bin above the exhaust hood of the furnace, and the scheelite concentrate charge is fed into the furnace by three screw feeders. There is a 1500mm×1800mm×500mm water pool on the side of the furnace. The hot tungsten iron is dug out from the furnace and immediately put into the water pool for rapid coo...

Embodiment 3

[0082] 1. Production site

[0083] The factory site of this embodiment is located in Shijiao Township, Beihu District, Chenzhou City, Hunan Province, and the factory covers an area of ​​6400m 2 .

[0084] 2. Production equipment

[0085] The main equipment includes: a tiltable three-phase open electric furnace, a transformer with a capacity of 4000kVA, the electrode is a self-baking electrode, and the electrode is fixed with a pneumatic spring clamping gripper. The shell is welded by 20mm thick steel plate. The whole furnace is placed on two semicircular rollers, and the tilt of the furnace is controlled by the lifting of the hydraulic cylinder to release the depleted slag. There is a feeding bin above the exhaust hood of the furnace, and the scheelite concentrate charge is fed into the furnace by three screw feeders. There is a 2000mm×2000mm×800mm water pool on both sides of the furnace. The hot tungsten iron is dug out from the furnace and immediately put into the water p...

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Abstract

The invention relates to a method for smelting ferrotungsten with scheelite concentrate. It uses a special three-phase electric arc furnace to smelt ferro-tungsten. The steps are: a. First, the electric arc furnace is preheated, and the electric arc furnace is heated to a temperature of 1540-1590 ° C; b. Add steel chips and continue heating to make The temperature of the furnace rises to 1800-2000°C; c. Use the charge prepared outside the furnace and put it into the furnace in batches for smelting, take two-thirds of the total batch of charge and one-third of the total amount of pitch coke and put it into the furnace to heat to Refining in a certain temperature area; after refining for 1 hour, the furnace temperature rises to 2500-3000°C, so that the WO of the melt in the furnace 3 There is more than 80% reduction; d. Dig iron before the end of scouring. When digging iron, add one-third of the total batch of charge and one-third of the total amount of pitch coke according to the steps of digging iron while refining and adding materials; e .After excavating ferro-tungsten, add one-third of pitch coke to carry out poor slag and slag dumping. After the ferro-tungsten product is cooled by water, it is finished and packaged in the warehouse; For: scheelite concentrate 70%~80%, FeO4%~9%, SiO 2 3% to 7%, FeSi 4% to 9%, and FeSi 1% to 5% with a content of 98%; the above formula components can be fully mixed evenly. The invention is mainly used for scheelite concentrate raw material to replace black tungsten concentrate raw material to realize smelting ferrotungsten by electric furnace method, which can achieve the purpose of reducing production cost and simplifying process operation procedure.

Description

field of invention [0001] The present invention relates to a method for smelting ferro-tungsten, in particular to a method for smelting ferro-tungsten with scheelite concentrate Background technique [0002] Ferro-tungsten is an important raw material in industry. It is mainly used as an alloy additive of tungsten in steelmaking. Traditional ferro-tungsten uses black tungsten concentrate as raw material, and additives are mixed in a certain proportion and then smelted in an electric furnace. become. This smelting method has problems such as difficult sources of raw materials, high requirements for raw materials, high cost, and complicated process operation procedures. [0003] Patent application number 94111809.6 also discloses "a method for smelting ferro-tungsten alloy". The mixture of tungsten concentrate, aluminum pellets and sodium nitrate is mixed at 70-119 kg / min·m 2 Add in the tank at a high speed, continue heating while feeding, so that the furnace temperature ri...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C22C1/02C22B4/06C22B5/10C22B34/36
Inventor胡帝生
Owner郴州市金龙铁合金有限公司