Tungsten Direct Alloying Steelmaking Process

The present invention provides a direct alloying tungsten ore steelmaking process. Specific steps are as follows:

1) First, the preparation of carbon-containing tungsten ore of tungsten ore pellets

a. carbon-containing tungsten ore pellets, including 80% to 85.5% of tungsten ore, 13% ~ 16.5% of the reducing agent, 1 to 2% of the catalyst, 0.5% ~ 1.5% binder ;

b. tungsten ore, reducing agents, catalysts were crushed and ground to a powder;

c. above powder mixed;

d. adding a binder to the powder compacts made ​​of the carbon bonded tungsten ore pellets;

2) The direct alloying steel tungsten mine, process as follows:

a. scrap, tungsten ore pellets containing carbon, silicon carbide or ferrosilicon smelting furnace loading, and smelting;

b. on Oxygen flux control, blowing late in the melting of choice;

c. melting and oxidation of low alkalinity of slag process;

d. later. baked desulfurization refining + vacuum degassing, the final casting.

The present invention is an enhanced solid state reduction process, at the end of the melting of the reduced rate of tungsten ore reached more than 90%, plus a reducing agent by reduction of further depleted, can yield more than 95% tungsten, solved when the furnace with direct alloying tungsten ore, tungsten ore reduction slow solid, solid-state reduction rate, low tungsten collected directly alloying slag large problem; present invention is equivalent to a single-step process that can save the investment and energy consumption.


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