Process for preparing deoxidant used in smelting steel and its composite rare-earth deoxidant

A deoxidizer and preparation method technology, applied in the field of olefin deoxidizer, can solve the problems of low equipment productivity, high raw material price, and high smelting temperature, and achieve the effects of low production cost, improved mechanical properties, and low smelting temperature.

Inactive Publication Date: 2002-01-09
薛国南
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, although the above-mentioned deoxidizers are various in variety and have their own advantages and disadvantages, they are all produced by the submerged arc furnace method.
There are generally two types of deoxidizers produced by the submerged arc furnace method. One is to mix the alloy or elemental substance according to the composition requirements of the prepared deoxidizer, and then melt in the submerged arc furnace. The other method is to mix the deoxidizer containing all The raw ore of the prepared deoxidizer component is proportioned according to the requirements, and the above deoxidizer is produced by adding coke and heating in a submerged arc furnace to produce the above deoxidizer in one step. The raw materials used in the former are high in price and cost, and the latter although The cost of raw materials is reduced, but the smelting temperature of this method is high, generally at 15000-25000°C (see CN99105492.X, CN00101497.X); electric heating requires a large amount of electric energy; the productivity is low, and generally 3 More than one hour, the productivity of the equipment with the same volume is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The horizontal reverberatory furnace used is a single-chord horseshoe-shaped regenerative glass melting furnace with a volume of 4000mm×2300mm×1600mm, and the refractory material is magnesia-aluminum bricks. Use heavy oil as fuel. The raw material formula of the rare earth deoxidizer used in the steelmaking process is:

[0022] Iron Ore 40% Bauxite 15%

[0023] Quartz Sand 10% Manganese Ore 8%

[0024] Carbonite 19% Misch 8%

[0025] Add 8% charcoal of the total weight of the above-mentioned ore, pulverize to 90% and pass through a 20-mesh sieve, and mix evenly. Before starting the furnace, add 1000 kg of the above-mentioned prepared raw materials, spray heavy oil and oxygen-enriched air (24% oxygen ), heated until the temperature in the furnace reached 1350°C, and maintained for 30 minutes, then began to discharge, and at the same time continuously added crushed ore raw materials, the feeding speed was 1000 kg / hour, and the discharging speed was about 700 kg / hour. ...

Embodiment 2

[0027] Equipment method is with embodiment 1, and raw material formula is:

[0028] Iron Ore 38% Bauxite 12%

[0029] Quartz Sand 9% Manganese Ore 14%

[0030] Carbonite 18% Misch 9%

[0031] The allotment of charcoal is with embodiment 1.

[0032] Crush the ore until 90% pass through a 20-mesh sieve and mix well. Spray heavy oil and air (containing 21% oxygen) to heat the furnace to a temperature of 1300°C and keep it for 60 minutes, start discharging and simultaneously add crushed ore raw materials continuously, the feeding speed is 1000 kg / h, and the discharging speed is about 700 kg / h At this time, the molten rare earth composite deoxidizer becomes solid after cooling, and its composition is: Fe: 39.4%; Al: 8.7%; Si: 12.8%; Mn: 14.6%; Ca: 17.9%; RE: 6.2%.

Embodiment 3

[0034] Equipment method is with embodiment 1, and raw material formula is:

[0035] Iron Ore 34% Bauxite 8%

[0036] Quartz Sand 12% Manganese Ore 13%

[0037] Carbonite 17% Barite 10% Mixed Rare Earth 6%

[0038] The input amount of charcoal is 13% of the total weight of ore.

[0039] Crush the ore until 90% pass through a 20-mesh sieve and mix well. Spray heavy oil and oxygen-enriched air (28% oxygen) to heat the furnace to a temperature of 1370-1390°C, and keep it for 60 minutes, then start discharging, and simultaneously add crushed ore raw materials continuously at a feeding speed of 1000 kg / hour, and discharge The speed is about 700 kg / h, and the molten rare earth composite deoxidizer becomes solid after cooling, and its composition is: Fe: 35.4%; Al: 6.8%; Si: 14.6%; Mn: 12.8%; Ca: 18.2%; Ba: 7.1%; RE: 5.0%.

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PUM

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Abstract

A process for prepairng the deoxidant used in steel-smelting procedure includes such steps as proportioning the raw ores, adding carbon as reductor, crushing, continuously loading to horizontal reverberatory furnace, heating to 1300-1450 deg.C by spraying heavy oil and air or oxygen-enriched air into the furnace for 25-100 min, and continuously discharging the finished deoxidant. A composite rare-earth deoxidant prepared by said process contains Fe (20-60%), Al (5-20), Si (2-15), Ca (5-25), Mn (1-15), Ba (0-25) and Re (3-20).

Description

1. Technical field [0001] The invention relates to a preparation method of a deoxidizer used in the steelmaking process and the clay deoxidizer. 2. Background technology [0002] In order to improve the quality of steel, deoxidizers must be added in the steelmaking process to remove impurities and improve the mechanical properties of steel. Although the above-mentioned deoxidizers are of a great variety at present, and each has its own advantages and disadvantages, they are all produced by submerged arc furnace method. There are generally two types of deoxidizers produced by the submerged arc furnace method. One is to mix the alloy or elemental substance according to the composition requirements of the prepared deoxidizer, and then melt in the submerged arc furnace. The other method is to mix the deoxidizer containing all The raw ore of the prepared deoxidizer component is proportioned according to the requirements, and the above deoxidizer is produced by adding coke and he...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/06
Inventor 薛国南乐可襄
Owner 薛国南
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