Process for producing brown fused alumina through combination of rotary kiln and electric arc furnace
A joint production and electric arc furnace technology, applied in the direction of rotary drum furnace, process efficiency improvement, furnace, etc., can solve the problems of slow reaction speed, energy saving and consumption reduction, the effect of reducing raw material cost is not obvious, and cannot reduce raw material cost, etc., to achieve Reduce the cost of raw materials, shorten the smelting time, and the effect of fine raw material particles
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Embodiment 1
[0043] Raw materials: raw bauxite 1000t, hematite 207.5t, coal powder 138t.
[0044] Among them, Al in raw bauxite 2 o 3 The content is 70.2%, SiO 2 6.52%, TiO 2 3.2%, Fe 2 o 3 2.3%, CaO content is 0.42%; Fe content in hematite is 65.1%, SiO 2 7.52%; the fixed carbon of pulverized coal is 61%, and the ash content is 7.3%.
[0045] Production method: Add 0.5% pregelatinized starch of the raw material weight to the above three raw materials, mix and pulverize it into a powder of <3mm, then add 6% water, stir it into a dry mud, put it into a ball press machine and press the raw material into a diameter It is a 3cm oblate ball, and finally enters the rotary kiln for calcination at 1300°C. Out of the kiln, it enters the semi-closed kiln head insulation silo, and evenly adds 1% coal powder by weight of raw materials through the chute through the small opening of the insulation silo to protect the raw materials from being oxidized by air.
[0046] Finally, according to the prod...
Embodiment 2
[0049] Raw materials: raw bauxite 1000t, oxide scale (iron oxide scale that falls off when the iron and steel plant processes various steel materials and castings at high temperature, the main component is Fe 2 o 3 ) 153t, pulverized coal 112.9t.
[0050] Among them, Al in raw bauxite 2 o 3 The content is 71.3%, SiO 2 6.2%, TiO 2 3.0%, Fe 2 o 3 2.8%, CaO content is 0.42%; Fe in scale 2 o 3 The content is 90.2%, SiO 2 1.8%, TiO 2 1.3%; the fixed carbon of pulverized coal is 62%, and the ash content is 7.8%.
[0051] Production method: add 0.5% sodium silicate by weight to the above three raw materials, mix and pulverize it into a powder of <3mm, then add 7% water by weight of raw materials, stir into dry mud, and press the raw materials into a ball briquetting machine. Flat balls with a diameter of 3cm are then put into a rotary kiln for calcination at 1350°C, and then exit the kiln into a semi-closed kiln head insulation silo, and evenly add 1% of the raw material w...
Embodiment 3
[0055] Raw materials: raw bauxite 1000t, magnetite 198t, blue carbon powder 121t.
[0056] Among them, Al in raw bauxite 2 o 3 The content is 70.3%, SiO 2 5.1%, Fe 2 o 3 3.1%, TiO 2 2.8%, CaO content is 0.38%; Fe3O4 content in magnetite is 90%, SiO 2 It is 3.2%; the fixed carbon of blue carbon powder is 80.2%, and the ash content is 7.2%.
[0057] Production method: Add 0.8% sodium lignosulfonate of raw material weight to the above three raw materials, mix and pulverize it into a powder of <3mm, then add 8% raw material water, stir into dry mud, put it into a ball press machine The raw material is pressed into a flat ball with a diameter of 3.0cm, then put into a rotary kiln for calcination at 1400°C, and exits the kiln into a semi-closed kiln head insulation bin, and evenly adds 1% of the raw material weight of coal powder from the chute through the small opening of the insulation bin to protect Raw materials are not oxidized by air.
[0058] Finally, according to the...
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