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Technique for alloying steel making directly from tungsten ore

A technology of alloying steelmaking and tungsten ore, which is applied in the field of alloy steel smelting, can solve the problems of large amount of direct alloying slag, low tungsten yield, and low solid-state reduction rate, so as to improve the reduction reaction speed and be easy to operate The effect of running and short recovery period

Inactive Publication Date: 2007-10-10
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of slow solid-state reduction speed of tungsten ore, low solid-state reduction rate, low yield of tungsten and large amount of directly alloyed slag when electric furnace is used for direct alloying of tungsten ore

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1: High-speed tool steel M2 (W6Mo5Cr4V2) is completely smelted by direct alloying of tungsten ore on an electric arc furnace with a charging capacity of 20 tons. The process route adopted is: low-phosphorus P scrap steel and carbon-containing tungsten ore balls are cold-packed in an electric furnace Group, silicon carbide SiC, adding ferromolybdenum → enter the melting period → enter the oxidation period → enter the reduction period → add ferrovanadium → add slag depletion agent silicon carbide SiC → release from the furnace → desulfurize and refine in the LF furnace → perform VD vacuum treatment → carry out pouring. In this process route, the carbon-containing tungsten ore pellets are first prepared, which are composed of 85% tungsten ore, 13% reducing agent, 1% catalyst, and 1% binder. Firstly, the tungsten ore, reducing agent, The catalyst is crushed and ground into a 200-mesh powder, then mixed and added with a binder to form a carbon-tungsten ore pellet. T...

Embodiment 2

[0037] Embodiment 2: fully use tungsten ore direct alloying to smelt high-speed tool steel M2Al (W6Mo5Cr4V2 Al) on the electric arc furnace with charging capacity of 15 tons. Silicon carbide SiC, adding ferromolybdenum → enter the melting period → enter the oxidation period → enter the reduction period → add ferrovanadium → add slag depleting agent SiC → add aluminum ingots, take out the furnace → carry out desulfurization and refining in LF furnace → perform VD vacuum treatment → carry out pouring. The prepared carbon-containing tungsten ore pellets are composed of 82.5% tungsten ore, 15% reducing agent, 1.5% catalyst, and 1% binder. First, the tungsten ore, reducing agent, and catalyst are crushed and ground into 200 Mesh powder, then mix and add binder to make tungsten carbide pellets. The tungsten content of tungsten ore is 49.6%, the reducing agent is 80% coal mixed with 20% coke powder, the fixed carbon content of coal is 82.5%, the fixed carbon content of coke powder i...

Embodiment 3

[0038] Example 3: High-speed tool steel M2Al (W6Mo5Cr4V2 Al) is smelted by direct alloying of tungsten ore on an electric arc furnace with a loading capacity of 10 tons. The process route adopted is: low-phosphorus scrap steel and carbon-containing tungsten ore balls are cold-packed in an electric furnace Group, silicon carbide SiC, adding ferromolybdenum → enter the melting period → enter the oxidation period → enter the reduction period → add ferrovanadium → add slag depleting agent SiC → add aluminum ingots, take out the furnace → carry out desulfurization and refining in LF furnace → carry out VD vacuum treatment → Perform pouring. The prepared carbon-containing tungsten ore pellets are composed of 80% tungsten ore, 16.5% reducing agent, 2% catalyst, and 1.5% binder. First, the tungsten ore, reducing agent, and catalyst are crushed and ground into 200 Mesh powder, then mix and add binder to make tungsten carbide pellets. The tungsten content of tungsten ore is 48.1%, the ...

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Abstract

This invention discloses a process for direct alloying steelmaking from tungsten ore. The tungsten ore pellet is composed of: tungsten ore 80-85.5%, reducer 13-16.5%, catalyst 1-2%, and binder 0.5-1.5%. The process comprises: pulverizing tungsten ore, reducer and catalyst, grinding into 200 mesh powder, mixing uniformly, adding binder, and pressing into tungsten ore pellet, loading into an electric oven, melting, and performing solid-state reduction until the reduction rate is higher than 90%. The tungsten recovery rate is higher than 95%. The process solves the problems of low reduction speed and rate, low tungsten recovery rate, and large slag amount faced by direct alloying of tungsten ore in an electric oven. The process is a single-step process, and has lowered investment and energy consumption.

Description

technical field [0001] The invention relates to the technical field of alloy steel smelting, in particular to a process for directly alloying and smelting tungsten-containing alloy steel by using tungsten ore. Background technique [0002] One of the key technological links in the production of tungsten-containing alloy steel is the alloying process in steel smelting. At present, tungsten-containing alloy steel is alloyed with tungsten by adding ferro-tungsten when charging. The production cost and energy consumption of this process are directly related to the consumption, production cost and energy consumption of ferroalloy. Inspecting the production status of tungsten-ferroalloy, it can be found that the production of ferroalloy consumes a lot of energy, the yield of alloy is low, the environment is polluted seriously, the labor intensity is high, and the economic benefit is poor. The power consumption of one ton of ferro-tungsten (containing 70% tungsten) produced by iro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C22B1/14C21C7/064C21C7/10
CPCY02P10/20
Inventor 李正邦周勇张家雯杨海森
Owner CENT IRON & STEEL RES INST
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