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Ferromolybdenum: Molybdic Oxide Smelted with Coke and Lime into Molten Steel in an Electric Arc Furnace (Brigham, US 4,160,661)

أنشأه

Charlie

1. نوفمبر 2026

Ferromolybdenum: Molybdic Oxide Smelted with Coke and Lime into Molten Steel in an Electric Arc Furnace (Brigham, US 4,160,661)

Technical molybdic oxide is fed in cans, with coke and lime, into a bath of molten steel in a 3000 kVA arc furnace. The electrodes stay in the slag, and the coke is trimmed after every charge unit so the metal keeps under 0.1 % carbon. Ferrosilicon and lime strip the slag, and the metal is shotted in running water. Result: from 5000 lb oxide, 3110 lb shot and pig of 54.1 % molybdenum, 0.06 % carbon, 43.1 % iron (Heat 4), using 1.94 kWh per lb of molybdenum. Source: Brigham, Sirianni and Garner, US patent 4,160,661 (1979), Example 2, Heat 4. Not given: how the shot was heated while drying overnight. Picture drawn by Youblob.

متقدم

1 day

التعليمات

Melt the steel

In a three-phase 3000 kVA arc furnace with 8 in graphite electrodes, lined with magnesia brick and rammed basic refractory (about 60 % MgO), 5 ft 6 in across and 26 in deep below the tap hole, melt 812 lb steel plate with 80 lb burnt lime under full power. Lead the fume to a bag house.

المواد لهذه الخطوة:

لوح صلب طري812 رطل

الأدوات المطلوبة:

الجير الحي

فرن القوس الكهربائي

قطب غرافيتي

غرفة المرشحات الكيسية

Make up the charge units

While it melts, weigh out five charge units, each 1000 lb molybdic oxide (in cans of 37 lb oxide in a 2 lb steel can), 250 lb coke and 320 lb lime. For Heat 4 that was 5000 lb oxide, 1150 lb coke, 1600 lb lime and 1488 lb steel in plate and cans. Ours: metallurgical coke for the dried breeze coke.

المواد لهذه الخطوة:

أكسيد الموليبدنوم التقني5000 رطل

لوح صلب طري1488 رطل

الأدوات المطلوبة:

فحم كوك معدني

الجير الحي

ميزان منصّة صناعي

Smelt in the bath

When the bath is molten at about 1450 °C, add one can of oxide with equal shovels of coke and lime every 2 minutes, about 1 hour per unit. Use the 205 V tap so the electrodes dip only into the slag; hold the bath at most 1760 °C. About 1 kWh per lb of oxide.

الأدوات المطلوبة:

مجرفة

فرن القوس الكهربائي

Keep the carbon down

After every charge unit, dip a steel spoon into the bath and analyse the carbon (about 15 minutes); cut the coke so the metal stays below 0.1 % carbon.

الأدوات المطلوبة:

فحم كوك معدني

Strip the slag and tap

Add 200 lb ferrosilicon and 560 lb lime to strip the slag. Tip the furnace into a preheated 5000 lb ladle: the first ladle is mostly slag, the second mostly metal. Back-pour the slag into slag pots.

الأدوات المطلوبة:

فيروسيليكون

الجير الحي

مِغرفة صبّ المعدن

Shot the metal

Pour the metal from the ladle into a second unlined 5000 lb ladle filled with running water from a 2 1/4 in fire hose, about 3000 lb a minute, from about 4 ft up; 2000 lb shots in 10 to 15 minutes. Dry the shot overnight at about 300 °F in 40 gallon drums. Ours: a drying oven.

الأدوات المطلوبة:

مِغرفة صبّ المعدن