CN101082072A

CN101082072A - New melting agent for steelmaking furnace slag

Info

Publication number: CN101082072A
Application number: CN 200610084905
Authority: CN
Inventors: 马云普; 范素珍
Original assignee: YANGQUAN TAIHANG FUSED MAGNESITE CO Ltd
Current assignee: YANGQUAN TAIHANG FUSED MAGNESITE CO Ltd
Priority date: 2006-05-31
Filing date: 2006-05-31
Publication date: 2007-12-05

Abstract

The new cinder smelting agent for steelmaking is one kind of alkaline oxide comprising lime in 15-37 wt%, iron oxide ore powder 60-85 wt%, and has smelting point lower than 1200 deg.c. It may be applied to replace fluorite, and possesses the advantages of reduced environmental pollution, raised iron yield, decreased steelmaking cost, capacity of stabilizing steel quality, etc.

Description

A kind of novel dissolving agent of copper smelter slag

Technical field:

The invention belongs to the technical field of smelting of electric smelting synthetic materials, be specifically related to a kind of novel dissolving agent of copper smelter slag.

Background technology;

Known to the contriver, at present in smelting, having made slag is link very important in the process for making, smelted furnace cinder contains a large amount of multiple oxide compounds and a small amount of sulfide, the melt that also contains a spot of fluorochemical and carbide in some cases, the for example physico-chemical property of converter steelmaking slag and the quantity of slag, the removal speed and the removal degree that are related to impurity in the steel, be related to the absorption of the non-metallic inclusion that from metal, floats, the recovery rate of splash size and metal, copper smelter slag is alkaline, calcium oxide is that content is maximum in the common top blown converter slag, the oxide compound that alkalescence is the strongest again, especially in top blown converter is smelted, tap to tap time is very short, therefore must accomplish quick slagging, make slag have suitable basicity as early as possible, oxidisability and flowability, so that rapidly phosphorus in the slag, sulphur, impurity such as silicon are all eliminated below the requirement of institute's steelmaking kind regulation, avoid slag to overflow and splash, the method that adopts is often to need to add fluorite in smelting at present, to promote the fusing of slag, the main component of fluorite is a Calcium Fluoride (Fluorspan), and its fusing point is lower, at high temperature is that explosion becomes fragment, fusing rapidly, energy rapid permeability lime (calcium oxide) surface forms low melting point eutectic, or forms CaOCaF ₂SiO ₂, the calcium oxide fusing point is reduced, thereby play the effect of rapidization slag, but the fluorite consumption is excessive, can obviously reduce lining life, and cause the environment fluoride pollution, the slag that does not add fluorite can also be made phosphate fertilizer, and fluorine-containing mistake just can not be made phosphate fertilizer.

Summary of the invention:

Purpose of the present invention is exactly for overcoming above deficiency, what provide does not a kind ofly need to add fluorite in steel-making, just can effectively promote slag fusing not contain too much acidic oxide, can improve the slag making situation novel dissolving agent of a kind of copper smelter slag of fluoride ion not again.

The present invention realizes like this, a kind of novel dissolving agent of copper smelter slag is a kind of basic oxide, and fusing point is lower than 1200 ℃, mainly is made up of lime and powdered iron ore, it is characterized in that it is mainly made by the following weight proportion raw material, (with weight amount part) lime is 20-37%; Powdered iron ore is 67-80%; Mainly containing calcium oxide is 15-37%; Containing ferric oxide is 60-85%; Finished product is pulverized and is desired particle size, molten iron mixes the novel dissolving agent that iron flask, torpedo jar and steel-making converter add copper smelter slag of the present invention, relies on the low melting point of self, the slag of not only having fluxed, and contained calcium oxide, ferric oxide help molten iron dephosphorization, silica removal, increased the recovery rate of iron of molten steel.

The present invention has and has reduced molten steel ton consumption cost, has stablized steel, the advantage of extending furnace lining life.

Description of drawings:

Accompanying drawing is: a kind of novel dissolving agent technological process of production figure of copper smelter slag

Embodiment:

Main with 20% lime and 68% powdered iron ore mixing, adopt the electric smelting method to smelt, finished powder is broken into the novel dissolving agent of a kind of copper smelter slag of user's desired particle size 5-40mm or 0-1mm, certain 210T of Iron And Steel Company, 24T, 35T, top-blown oxygen converter use in producing at home, add this dissolving agent 2-5kg (contained calcium oxide 22%, ferric oxide 64%, fusing point are lower than 1170 ℃) by molten iron per ton, chemically examine the chemical ingredients of its slag, characteristics are as follows:

1. the novel dissolving agent fusing point of a copper smelter slag is lower, and it is rapid to change slag, and slagization is saturating, can replace fluorite fully, eliminate the pollution of fluorochemical to environment, the novel dissolving agent afterreaction that adds copper smelter slag is steady, it is fierce not add the fluorite reaction, produces the splash phenomenon.

2. the average result of laboratory test that adds the novel dissolving agent slag of copper smelter slag is compared with the slag that similar steel grade, molten iron, auxiliary material add, ferric oxide has reduced by 1.51% in the slag, iron protoxide has reduced by 2.04%, full iron has reduced by 2.67%, silicon-dioxide has improved 1.37%, Vanadium Pentoxide in FLAKES has improved 0.24%, and calcium oxide has improved 2.81%;

3. explanation: the novel dissolving agent of copper smelter slag is the good dissolving agent of slag, has replaced fluorite fully, and it makes T in the slag _FeContent reduces, increase the recovery rate of iron of molten steel, the steel-making ton steel cost reduces, and has improved the effect of silica removal and dephosphorization in the smelting steel, simultaneously, the novel dissolving agent of copper smelter slag contains a certain amount of calcium oxide, basicity height, extending furnace lining life highly significant, the novel dissolving agent composition of copper smelter slag is even, stable, have certain intensity, can be according to the requirement of different user, the processing desired particle size.

Claims

1. the novel dissolving agent of a copper smelter slag is a kind of basic oxide, and fusing point is lower than 1200 ℃, mainly is made up of lime and powdered iron ore, it is characterized in that it is mainly made by the following weight proportion raw material, and (with weight amount part) lime is 20-37%; Powdered iron ore is 67-80%; Mainly containing calcium oxide is 15-37%; Containing ferric oxide is 60-85%; Molten iron mixes iron flask, torpedo jar and steel-making converter and adds

2. the novel dissolving agent of a kind of copper smelter slag shown in claim 1 is characterized in that adopting capacitance method production, and finished product is pulverized and is desired particle size.

3. the novel dissolving agent of a kind of copper smelter slag shown in claim 1 is characterized in that adding in the torpedo jar of molten iron or hot metal mixer, or adds in the smelting steel oxygen blast.

4. the novel dissolving agent of a kind of copper smelter slag shown in claim 1 is characterized in that being mainly used in the change slag in the smelting iron and steel and removes impurity (sulphur, phosphorus, silicon etc.).