CN1322597A

CN1322597A - Pre-molten protective particle sludge and its production process

Info

Publication number: CN1322597A
Application number: CN 01115451
Authority: CN
Inventors: 刘长福
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-04-26
Filing date: 2001-04-26
Publication date: 2001-11-21
Anticipated expiration: 2021-04-26
Also published as: CN1151902C

Abstract

The protective sludge for continuous casting is produced by using natural mineral material and industry waste as base material and through premelting, grinding, mixing with water into pulp and spray drying. Compared with available protective sludge, the product of the present invention has the features of homogeneous component, good smelting and heat insulating performance, homogeneous smelting, high lubricant effect, etc. and its use can raise the quality of cast product greatly.

Description

Pre-molten protective particle sludge and production technology thereof

The invention belongs to the continuous casting covering slag field, relate to a kind of continuous crystallizer protecting slag product and production technology thereof.

Existing continuous crystallizer protecting slag production method adopts mechanical mixing more; mechanical forming method; semi-molten method etc.; with the mechanical forming method is that its basic working procedure of example is: will prepare burden according to the scheme ratio after the raw material fragmentation; pouring system ball dish behind the confected materials ball milling into; under system ball dish rotation situation, add binder solution, make pulverulent material in conjunction with balling-up.Oven dry then, sub-sieve, packing warehouse-in.

Because this production method production cycle is long, difficult quality guarantee, and labor strength is big, is not suitable for big industrial needs.Slag sand is substantially without the sintering fritting, the covering slag of the production deliquescence that easily absorbs water, and the term of validity is short; be rich in the crystallization water, the composition instability is behind the adding crystallizer; form unstable melting layer and non-homogeneous slag film, easily produce harmful slag circle and bleed-out takes place easily, be unfavorable for continuous casting steel machine.

The objective of the invention is provides a kind of new continuous crystallizer protecting slag and production technology thereof at some weak point of prior continuous casting protective slag.

The present invention relates to a kind of continuous casting covering slag product and production technology thereof; this top product adopts natural minerals; the industry waste product is as basic slag charge; through fritting; water distribution is sized mixing behind the grinding; make granule product with spray drying tower; compare with existing continuous casting covering slag; this product composition is even; melting behaviour and good heat insulating; fusing evenly; high lubricating effect; cost is low; there is not the phase-splitting fusing when being heated; be difficult for crystallization during cooling; be difficult for the moisture absorption; do not produce subcutaneous blowhole; characteristics such as the term of validity is long; can improve the strand qualification rate greatly when using as continuous crystallizer protecting slag; reduce crackle; give full play to the advantage of large-scale continuous casting machine, produce high-quality strand.

Realize that production technology of the present invention is made up of fritting base-material production technology and spray-drying process production technology two big production technologies.Its concrete production process is:

1. according to technical scheme and various each component of required raw material, basic material is mixed in proportion.

2. compound is dropped in the premelt furnace and melt.The duration of heat of raw material in stove is 1-3 hour, and the furnace temperature condition is 1000-1500 ℃.Carry out the nature cooling after coming out of the stove.

3. cooled pre-melt is become the graininess of granularity less than 3mm with crusher in crushing.

4. with the ball mill grinding of the base-material after the fragmentation, surmise requirement 0-200 order 〉=90%.

5. the water that base-material is allocated into 10%-30% grinds to form mud in stirring water mill.

6. granulate with the spray-drying process tower, the product of a material 0-2mm who makes accounts for more than 90%.

7. the packing of product is put in storage.

The embodiment of pre-molten protective particle sludge of the present invention and production technology:

1. the chemical analysis of pre-melted type material covering slag

CaO Sio ₂ C Al ₂O ₃ BaO Mgo

32 35 2 3 4 5

K ₂O+Na ₂O CaF ₂

11 8

2. after above material being prepared, send into continuously in the premelt furnace and under 1000-1500 ℃ condition, be incubated 1-3 hour, it is cooled off naturally, be broken into the particle of granularity with common jaw crusher less than 15mm, then with kibbler roll once more fragmentation make the base-material granularity less than 3mm, make granularity reach 0-200 order 〉=90% with the ball mill grinding above base-material, add the water of 10-30%, in stirring water mill, grind to form mud, packing warehouse-in after spray-dried tower is granulated.

The present invention compares with existing continuous crystallizer protecting slag production technology, and the output height is consuming time Few, pollute littlely, reduced workman's labour intensity.

This product uses as continuous crystallizer protecting slag following advantage:

1. high insulating effect prevents that molten steel heat radiation and molten steel face from solidifying crust;

2. spreadability is good, and liquid level is active, prevents secondary oxidation of steel;

3. fusing evenly makes Billet stable;

4. the dross inclusion adsorption ability is strong, and the strand zero defect rate reaches more than 95%;

5. in the situation of liquid level stabilizing, do not produce harmful slag circle;

6. chemical analysis is stable, and water absorption rate is low, and the term of validity is long;

7. molten state is reasonable, is applicable to different casting, the continuous casting production of various steels;

8. basicity is suitable, and there is not short knot effect in molten steel, generally speaking, and dross bar not, Need not drag for slag, saving of work and time brings convenience to operation;

9. this product no dust pollution helps operator's physical and mental health;

10. reduction steel-making cost, the slag consumption is low, and ton steel consumption is about 0.5Kg-0.7Kg

Claims

1. a pre-melted type material covering slag is characterized in that consisting of of this covering slag:

CaO:20-45％； SiO ₂:20-50％； C:0-25％；

Al ₂O ₃:0-15％； BaO:0-15％ MgO:0-15％；

SrO:0-15％； CaF ₂:0-15％； B ₂O ₃:0-10％

Na ₂O+K ₂O:0-15％

2. being characterized as of pre-melted type material its technology of covering slag: basic slag charge is sent into fritting under 1000-1500 ℃ temperature in the premelt furnace continuously after preparing.

3. pre-molten protective particle sludge according to claim 2, the product that it is characterized in that the covering slag 0-2mm after spraying granulation is handled is greater than 90%.