CN1209459A - Multifunctional synthesized slag for refining furnace - Google Patents

Abstract

The multifunction synthetic slag for refining furnace comprises the following ingredients (wt%): lime 55-65%. limestone 3-10%, fluorite 3-10%, caustic soda 3-9%, raw dolomite 4-8%, aluminium grain with diameter of 3-5 mm 3-5%, silicon carbide (silicon content is 45-55%) 5-10%, silicon-calcium alloy 2-3% and aluminium dust (aluminium content is 10-15%) 1-3%. Said invented product posseses several functions of desulphurization, deoxidation and foaming and smothering arc. As compared with existent synthetic slag, its desulphurization capacity is raised by above 30%, refining time can be shortened by above 15 min, and can be up to below 30 min, and can make ladle life prolonged by 8-10 times.

Description

Multifunctional synthesized slag for refining furnace

The present invention relates to electric furnace slag free tapping reduction period refining slag system material.

The refining of electric furnace slag free tapping reduction period on function or have only deoxidation, desulfurization, or has only the effect of foaming submerged arc with slag system, adds long reaction time respectively, weak effect, and labour intensity, operation easier are big, and energy consumption is big.

The purpose of this invention is to provide a kind of multifunctional synthesized slag that has deoxidation, desulfurization, foaming submerged arc concurrently, improve slag steel speed of response.

Multifunctional synthesized slag for refining furnace of the present invention, its weight consists of:

Lime 55～65%, Wingdale 3～10%, fluorite 3～10%, caustic soda 3～9%, unprocessed dolomite 4～8%, the aluminum shot 3～5% of Φ 3～5mm, silicon carbide (siliceous 45～50%) 5～10%, silicocalcium 2～3%

Above-mentioned synthetic slag also comprises aluminium ash (containing aluminium 10～15%) 1～3%.

With raw material drying, be processed into the granularity of Φ 2～3cm, proportion together.

Reasonably the set of dispense ratio is a key of the present invention, it has directly determined synthetic slag desulfurization, deoxidizing capacity and foaming degree, the present invention has the multi-function action of desulfurization, deoxidation and foaming submerged arc, speed of response is fast, compares sweetening power with synthetic slag in the past and improves more than 30%, and the refining furnace refining time shortens more than 15 minutes, reach below 30 minutes, refining furnace is smelted the ton consumption and is reduced 22kwh, ton steel joint aluminium 1kg, and ladle life improves 8～10 times.

Shandong Laiwu Iron and Steel General Works, Shandong Prov. special steel plant is used for the low basicity synthetic slag of high-carbon-chromium bearing steel, and oxygen content in steel is reduced to below the 20ppm, smelts qualification rate (comprehensive test) and reaches 100%; The synthetic slag sweetening power that is used to produce steel alloy has improved 31%, and power consumption has reduced the 22.3kwh/t steel, and ladle life has improved 9 times, and a ton steel production cost has reduced by 32.48 yuan, and year benefit is more than 5,000,000 yuan.

Embodiment 1: lime 60%, Wingdale 8%, fluorite 6%, caustic soda 6%, unprocessed dolomite 4%, the aluminum shot 4% of Φ 3～5mm, silicon carbide (siliceous 45～50%) 7%, silicocalcium 2% aluminium ash (containing aluminium 10～15%) 3%.

Embodiment 2: lime 55%, Wingdale 10%, fluorite 3%, caustic soda 9%, unprocessed dolomite 6%, the aluminum shot 3% of Φ 3～5mm, silicon carbide (siliceous 45～50%) 10%, silicocalcium 2% aluminium ash (containing aluminium 10～15%) 2%.

Embodiment 3: lime 65%, Wingdale 3%, fluorite 8%, caustic soda 3%, unprocessed dolomite 8%, the aluminum shot 5% of Φ 3～5mm, silicon carbide (siliceous 45～50%) 5%, silicocalcium 2% aluminium ash (containing aluminium 10～15%) 1%.

Claims (2)

1, a kind of multifunctional synthesized slag for refining furnace is characterized in that its weight consists of:

Lime 55～65%, Wingdale 3～10%, fluorite 3～10%, caustic soda 3～9%, unprocessed dolomite 4～8%, the aluminum shot 3～5% of Φ 3～5mm, silicon carbide (siliceous 45～50%) 5～10%, silicocalcium 2～3%

2, synthetic slag according to claim 1 is characterised in that also to comprise aluminium ash (containing aluminium 10～15%) 1～3%.