CN1032410C

CN1032410C - Synthetic skim agent

Info

Publication number: CN1032410C
Application number: CN 92105897
Authority: CN
Inventors: 李新合
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-07-17
Filing date: 1992-07-17
Publication date: 1996-07-31
Anticipated expiration: 2007-07-17
Also published as: CN1081130A

Abstract

The present invention relates to a synthetic slag-collecting agent which is particularly suitable for pouring cast-iron, is composed of perlite (tuff), silica glass powder and sodium bicarbonate, and can also be added with rice-straw ash. The slag-collecting agent is granular, collects slag into blocks without dust, bag sticking and slag sticking, can not shrink when covered on the surface of an iron bag for a long time, and is easy to remove after cooled into brittle glass bodies.

Description

Synthetic skim agent

The invention belongs to metallurgical melting with the collection residue material, be particularly suitable for cast iron collection slag.

Present national cast iron industry has part producer to limit because of being subjected to resource, still adopt ancient wooden stick pushing off the slag casting process, do not add insulation, collection residue material, can cause the molten iron heat loss in the iron bag fast so on the one hand, make the foundry goods edge produce group's shape hole, also may rupture along cold shut, sometimes often make foundry goods the slag inclusion waste product occur because of pushing off the slag is bad, can not guarantee product quality, influence economic benefit of enterprises, the heat radiation height worsens production environment on the other hand.What also some producer used is collection residue material---the rice-straw ash of using always, from using field condition, there is dust to fly upward, pollute shortcoming bigger, inconvenient accumulating, the source of goods is relatively more nervous, relatively poor from result of use collection slag effect, sticking bag, dross phenomenon are arranged, to turn over bag unclean.

R﹠D institution, universities and colleges and part enterprise had done a large amount of work in recent years, seek comparatively ideal collection residue material, found the graininess perlite to be the collection residue material at last, this nonmetallic mineral preliminary test collection slag is effective, viscosity is big, be better than rice-straw ash, also solved the inconvenience that dust flies upward inconvenient accumulating simultaneously.But by a large amount of uses of long-term different condition, come out fully in bad place, on the one hand is that sticking bag is serious, dross severity, and it is unclean to turn over bag, and bad cleaning influences service life of iron bag, has increased working strength of workers; Be clinker when at high temperature the time is long on the other hand, clinker shrinks very fast, makes iron liquid be exposed to oxidation by air in the air.In addition, more slightly just being not easy of bits melted, and the collection slag is bad, accidentally can cause waste products such as foundry goods slag inclusion, pockmark, influences product quality, and adaptive surface is narrow, can not satisfy the needs of casting industry.

The objective of the invention is to overcome the deficiency of existing collection residue material, a kind of desirable synthesis type skim agent is provided, it has uniform particles, viscosity is suitable, easy to use, good heat preservation performance, the collection slag becomes piece, purifying molten iron, do not pollute not sticking bag, not dross, turn over and be responsible for a task until it is completed only, be used for set of surfaces slag, the insulation of various cast irons and various non-ferrous metals.And can improve the access times of iron bag, and reduce labor intensity, be convenient to accumulating, not limited by resource, can satisfy pressing for of growing cast iron industry.

Synthetic cast iron skim agent of the present invention is a kind of graininess (column type, ball-type and unformed particle) mineral composition, and wherein composition has perlite (or tufa stone), fused silica powder, sodium bicarbonate, and the parts by weight proportioning of various compositions is as follows:

Perlite (or tufa stone) 60-80

Fused silica powder 7-25

Sodium bicarbonate 5-20

Perlite (or coagulating outstanding rock) plays skeleton function, mainly provides higher viscosity, plays the effect of collection slag.Consumption is higher than that in limited time viscosity is excessive, sticking easily bag, dross, and it is unclean to turn over bag, influence iron bag access times, and consumption is lower than that viscosity is too small down in limited time, does not have the slag effect that collects.

Fused silica powder mainly play collection during slag long-time high temperature do not shrink, the cooling back forms vitreum, makes the clinker cleaning of enbrittling.Consumption is lower than the contraction problem that can not solve skim agent down in limited time, and cooled fragility is also not enough, and it is too high that consumption is higher than the fusing point of prescribing a time limit, influence collection slag.

Sodium bicarbonate plays a part to adjust fusing point, molten speed, and being that skim agent is sticking wraps not dross, and activity is good, is convenient to turn over be responsible for a task until it is completed only, improves the access times of iron bag.Consumption is higher than in limited time, and viscosity is little, and skim agent is rarer not to have an effect of collection slag, and consumption is lower than down that the fusing point of skim agent is higher in limited time, melt badly, and influence collects the slag effect.

The present invention can also add rice-straw ash except that the skim agent that adopts said ratio, form skim agent by following parts by weight proportioning:

Perlite (or tufa stone) 60-80

Fused silica powder 7-25

Sodium bicarbonate 5-20

Rice-straw ash 8-15

Rice-straw ash also is the collection residue material, mainly is to utilize its light specific gravity, bulky advantage in this prescription, and the overall proportion of skim agent is reduced, and makes its Unit Weight that bigger volume be arranged, and to reduce the consumption that first three plants material, reaches the purpose that totle drilling cost descends.Simultaneously, it has the effect of adjusting viscosity concurrently.Consumption is higher than that in limited time viscosity is too small, and the collection slag is bad when casting fast, and consumption is in proportion is bigger in limited time down, the use cost height, and viscosity is bigger, sticking easily bag, bad cleaning.

The physical and chemical performance of synthesis type skim agent is as follows:

Physical property

Granularity (mm) 1-3

Moisture content (%) 0.7-1.5

Unit weight (g/cm ²) 0.8-1.0

Fusing point (℃) 900-1200

Molten speed (S) 30-70

Viscosity (NS/m ²) 180-240

Chemical composition

SiO ₂ 58-68

Al ₂O ₃ 6-14

Fe ₂O ₃ 1-3

MgO 1-3

CaO 1-4

Na ₂O 3-12

K ₂O (when rice-straw ash is arranged) 0.5-1.5 embodiments of the invention are as follows: 1

Perlite (or tufa stone) 70 80 60

Fused silica powder 10 7 25

Sodium bicarbonate 10 5 20 adds rice-straw ash

Rice-straw ash 10 8 15

The prescription of the synthesis type skim agent of embodiment one is reasonable, viscosity is suitable, the collection slag is good, the synthetic skim agent prescription fusing point viscosity higher that adapts to face width: embodiment two is big, the collection slag is good, adapts to big iron bag, higher temperature, the long period cast, use on the surface of little iron bag of incompatibility low temperature and non-ferrous alloy; The prescription fusing point of the synthesis type skim agent of embodiment three is lower, and viscosity is less, and use on the surface that adapts to little iron bag, fast cast, low temperature and non-ferrous alloy.

The synthesis type skim agent prepares by following technological process:

Ball milling-prepare burden-stir-granulate-dry-pack-put in storage-dispatch from the factory

The cast iron producer of the various conditions of this product adaptation and non-ferrous casting producer adapt to the molten iron in the casting, the surface coverage of non-ferrous alloy, insulation, collection slag, and the ton consumption is about 1.5KG.Molten iron surface melt cinder does not need to skim after a little while, drops into this product and can play good collection slag, insulation effect equally.Main performance has following several aspect:

1 collection slag becomes piece, do not shrink, and secluding air, anti-oxidation, purifying molten iron alleviates molten iron and rocks, and prevents outer spattering;

Can form glass rapidly and melt shell after 2 fusings, be convenient to after the cooling remove, sticking bag, dross is not turned over and is responsible for a task until it is completed only, prolongs iron bag service life;

3 covering and heat insulatings are good, prevent heat radiation, alleviate heat leakage;

4 do not have dust pollution, improve environmental condition, reduce labor strength;

5 rates of reducing the number of rejects and seconds improve casting quality, increase enterprise's overall economic efficiency.

Claims

1. synthesis type collection agent is characterized in that it has perlite (or tufa stone), fused silica powder and sodium bicarbonate, and its parts by weight proportioning is as follows:

Perlite (or tufa stone) 60-80

Fused silica powder 7-25

Sodium bicarbonate 5-20

2. synthetic skim agent as claimed in claim 1 is characterized in that also adding rice-straw ash, and the parts by weight proportioning is as follows;

Rice-straw ash 8-15