Technology for producing ladle furnace (LF) submerged arc refining agent by utilizing electrolytic aluminum overhaul slag

Abstract

The invention discloses a technology for producing a ladle furnace (LF) submerged arc refining agent by utilizing electrolytic aluminum overhaul slag. The technology for producing the LF submerged arcrefining agent by utilizing electrolytic aluminum overhaul slag comprises the steps that carbon blocks and electrolytes in overhaul slag of an electrolytic aluminum factory are sorted and crushed, with carbon block particle size being smaller than 1mm and electrolytes crushed to 5 + / - 0.53mm; magnesium oxide powder with magnesium oxide content larger than 80% is purchased and transported to a ball-pressing production line, waiting to be used; the adding amount of carbon block powder and electrolyte powder is determined according to the carbon content, and the carbon content in the middle ofa submerged arc agent is guaranteed to be controlled below 35%; according to the fluorine ion content, it is determined that the adding amount of magnesium oxide is 10% of the fluorine ion concentration; various raw materials are mixed uniformly; and a spheric submerged arc refining agent with diameter being 30-50 mm is manufactured through dry type ball pressing, wherein main components of the refining agent comprises, by weight, 15-35% of carbon, less than 35% of fluorine ion, 5-9 % of magnesium oxide and no requirements for sodium ion and aluminum oxide. In the smelting process of a LF refining furnace, the adding amount of the refining agent is 2-5 kilograms per ton of steel, and the specific usage amount is determined according to the situation of refined molten steel.

Description

Technical field [0001] The invention relates to a process for producing LF submerged arc refining agent by using electrolytic aluminum overhaul slag. Background technique [0002] The aluminum electrolysis cell needs to be overhauled after 4 to 7 years of operation. The removed waste is called overhaul slag, which is mainly waste cathode carbon blocks, waste refractory materials, waste insulation materials, etc. At the same time, a certain amount is generated during the electrolysis process. Of anode carbon particles. Due to the large differences in current capacity, inner village structure, lining material types, electrolysis process conditions, operating systems, and cell life of various electrolytic aluminum plants, the specific composition of waste also varies greatly, but the main components are basically the same. According to the existing research, the mineral structure in the middle of the overhaul slag is mainly: NaF 12.7, Na 3 AlF 6 65.7, Al 2 O 3 5.6, NaAl 11 O 17 ...

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Problems solved by technology

[0004] According to the above literature introduction, it can be seen that there is no process technology for treating electrolytic aluminum overhaul slag by using LF refining furnace