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Method for producing phosphorus weathering resistant steel from limonitic laterite ore

A technology using limonite and laterite, which is applied in the field of iron and steel metallurgy, can solve problems such as poor fluidity of molten iron, low nickel content, and low iron content, and achieve the effects of saving resources, reducing environmental pollution, and improving production efficiency

Active Publication Date: 2014-05-14
前海索新发展科技(深圳)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, limonite-type lateritic nickel ore is a low-grade symbiotic mineral containing nickel, iron, chromium, and aluminum. It has low iron content, low nickel content, and high phosphorus content. When smelting in a blast furnace, the amount of slag is large and the viscosity is large, and the fluidity of molten iron is poor. , difficult to smelt
In addition, in order to produce high-quality weathering steel, AOD refining method (argon oxygen decarburization) and LF (Ladle Furnace) refining technology are usually used after the electric furnace or converter process, that is, first Using blast furnace, subsequent electric furnace or converter, and subsequent AOD furnace and / or LF to produce high-quality weathering steel, although this process realizes the comprehensive utilization of limonite laterite ore, it still does not break away from electric furnace and converter, and the cost is still high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The method of using limonite-type laterite to produce phosphorus-containing weathering steel of the present embodiment comprises the following steps:

[0023] Step 1: prepare ore: the main component of the limonite type laterite ore containing nickel and phosphorus used is as follows: by weight percent content: TFe30%, Ni0.4%, Cr0.8%, P0.015%, CaO0. 5%, SiO2 1%, MgO1%, Al2O3 2%;

[0024] Step 2: Preparation of sintered ore: After the above-mentioned ore is crushed, screened and dried for pretreatment, mineral powder and lump ore with a certain particle size range are obtained. Coal powder or coke powder is used as fuel, and 0.3% limestone is used as flux, and then sintered ore is made in the sintering machine. The weight percentage content of the main components of the sintered ore is: TFe35.8%, Ni0.8% , Cr0.8%, CaO9.05%, SiO2 7.22%, MgO1.36%;

[0025] Step 3: Blast furnace ironmaking: adding sintered ore, coke, coal powder and limestone to the blast furnace for smelt...

Embodiment 2

[0032] The method for smelting low-phosphorus weathering steel with limonite-type lateritic ore containing nickel and phosphorus used in this embodiment includes the same steps as in Example 1, but the ore raw material components, sintered ore fuel, main components of flux, blast furnace ironmaking Raw materials, process parameters and molten iron composition, weathering steel composition after AOD and LF refining are different.

[0033] The method of using limonite-type laterite to produce phosphorus-containing weathering steel of the present embodiment comprises the following steps:

[0034] Step 1: Prepare the ore: the main components of the limonite-type laterite ore containing nickel and phosphorus used are as follows: in terms of weight percentage content: TFe52%, Ni1.8%, Cr2.0%, CaO2.0%, SiO2 15 %, MgO15%, Al2O3 10%;

[0035] Step 2: Preparation of sintered ore: After the above-mentioned ore powder is crushed, screened and dried for pretreatment, the ore powder and lum...

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PUM

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Abstract

The invention provides a method for producing phosphorus weathering resistant steel from limonitic laterite ore. The method comprises steps of preparing ore; preparing sinter; carrying out blast furnace iron making; implementing argon oxygen decarburization (AOD) refining; performing LF (Ladle Furnace) refining; after obtaining molten weathering resistant steel, continuously casting the molten steel into a slab or a billet through a slab or billet continuous casting machine, or furthermore, implementing controlled rolling to the obtained slab or billet through a continuous mill group, so as to produce weathering resistant steel profile or slab. The method has the beneficial effects that the adopted raw material, namely limonitic laterite ore containing nickel and phosphor, is abundant in source and cheap in price, thus saving resource, relieving environmental pollution, recycling waste material and realizing comprehensive utilization; a blast furnace greater than 300m<3> can be used for melting the limonitic laterite ore containing nickel and phosphor, so as to realize long-term large-scale production and improve the production efficiency; the production process of the weathering resistant steel omits a process of converter or electric steel making, thus greatly reducing the production cost of the weathering resistant steel.

Description

technical field [0001] The invention relates to the field of iron and steel metallurgy, in particular to a method for producing phosphorus-containing weathering steel by using limonite-type laterite ore. Background technique [0002] Weathering steel, that is, atmospheric corrosion-resistant steel, is a low-alloy steel between ordinary steel and stainless steel. Weathering steel is widely used as a steel structure exposed to the atmosphere for a long time. In recent years, new production methods have been continuously developed. In the existing technology, there are mainly two kinds of raw materials used in the smelting of weathering steel. The first type: blast furnace molten iron, clean weathering steel return steel, high-carbon ferrophosphorus and high-purity ferronickel; the second type: clean weathering steel return Steel, ordinary steel scrap, high-carbon ferrophosphorus and high-purity ferronickel are smelted in electric furnace or converter. The biggest disadvantage...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/40C21B5/00
CPCY02P10/20
Inventor 董书通
Owner 前海索新发展科技(深圳)有限公司
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