Electric furnace smelting process for manganese-rich slag
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A kind of electric furnace smelting, manganese-rich slag technology
Active Publication Date: 2009-07-15
JIAOCHENG YIWANG FERROALLOY
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[0023] The present invention provides a manganese-rich slag circuit smelting process in order to solve the problems of high energy consumption, dangerous operation and waste in the smelting process of manganese-rich slag in the prior art
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Embodiment 1
[0073] Example 1: 6300KVA electric furnace production example:
[0074] From January 10 to January 25, 2008, a total of 1358.8 tons of manganese-rich slag and 807.98 tons of high-carbon ferromanganese were produced.
[0075] Average manganese content in slag: 42.46%, and its range: 40.25~44.79%.
[0076] The average manganese content of the alloy: 72.43%, and the range: 70.11~74.80%.
[0077] All other components of high-carbon ferromanganese meet national standards.
[0078] The ratio of ingredients into the furnace: imported 10# ore: 900kg; imported 2# ore: 100kg; coke: 150kg; silica: 20kg.
[0079] The average composition of manganese ore entering the rotary kiln: Mn 40.01%, Fe 9.47%, P 0.070%, S 0.0199%.
[0080] The secondary voltage used for smelting is 126 volts.
Embodiment 2
[0081] Example 2: 9000KVA electric furnace production example:
[0082] From July 1st to July 25th, 2008, a total of 1,371.12 tons of manganese-rich slag and 680.9 tons of high-carbon ferromanganese were produced.
[0083] Average manganese content in slag: 45.23%, and its range: 43.23~48.42%.
[0084] The average manganese content of the alloy: 66.73%, and the range: 65.03~68.38%.
[0085] All other components of high-carbon ferromanganese meet national standards.
[0086] The ratio of ingredients into the furnace: imported 4# ore: 850kg; imported 1# ore: 150kg; coke: 140kg; sometimes some silica is added to adjust the viscosity of the slag.
[0087] The average composition of manganese ore entering the rotary kiln: Mn 41.32%, Fe 9.14%, P 0.069%; S 0.020%.
[0088] The secondary voltage used for smelting is 138~144 volts.
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Abstract
The invention belongs to the process for smelting manganese-rich slag, and particularly relates to the process for smelting the manganese-rich slag using an electric furnace. The invention, which solves the problems that the process for smelting the manganese-rich slag is energy-intensive, operationally dangerous and consumptive, is characterized in that manganese ore is pre-heated by a rotary kiln, wherein, the temperature, at which the manganese ore is pre-heated in the rotary kiln, is controlled within 900 to 1,100 DEG C; and the charging temperature of the manganese ore to be pre-heated is controlled above 600 DEG C. Compared with the prior art, the invention has the following beneficial effects: the power consumption for smelting is remarkably reduced; the production capacity of the electric furnace is expanded; the operating rate thereof is increased; the working condition is improved; and the labor productivity and the labor safety are improved.
Description
Technical field [0001] The invention belongs to a manganese-rich slag smelting process, and specifically relates to a manganese-rich slag electric furnace smelting process. Background technique [0002] In the past, the old-style electric furnace smelting manganese-rich slag technology generally used small and medium-sized tilting electric arc furnaces and fixed reduction electric furnaces. The former uses magnesia furnace lining and graphite electrodes, and the latter uses graphite furnace linings and self-baking electrodes. The description can refer to the old process flow chart ( figure 1 ). [0003] There are two types of smelting operations: discontinuous and continuous: [0004] 1. Intermittent operation: prepare the required charge for one furnace. After the previous furnace is out of the furnace, in order to prevent damage to the furnace lining, first mix the coke and the refined waste slag of this furnace into the furnace, and then add manganese ore and silica. Graduall...
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