CN1056715A

CN1056715A - Waste iron chip smelting direct casting piece technology

Info

Publication number: CN1056715A
Application number: CN90107272A
Authority: CN
Inventors: 田志兴; 吴君旺
Original assignee: Individual
Current assignee: Individual
Priority date: 1990-08-24
Filing date: 1990-08-24
Publication date: 1991-12-04

Abstract

The present invention relates to the technology of the direct pouring cast part of a kind of using melted waste iron filings.Smelt in the pig iron process at waste iron filing, steel cuttings, corner blanking throwing stove in bulk, utilize ironmaking base iron, overheated without secondary, only when molten iron is come out of the stove, purify rotten the processing through the stokehold, change the graphite form and the matrix of cast iron, improve the castability of ironmaking base iron, directly successfully water and outpour ironcasting.This Technology advanced person, technology is reasonable, less investment, instant effect can transform waste material on the spot, reduces environmental pollution, and effectively save energy reduces labor intensity, and shortens the production cycle, is beneficial to and develops production, and lid is imitated significantly in economic, society, is suitable for and applies.

Description

Waste iron chip smelting direct casting piece technology

The present invention relates to the technology of the direct pouring cast part of a kind of using melted waste iron filings, belong to and smelt and Foundry Production.

Utilize using melted waste iron filings, development was particularly rapid in recent years.Mostly its production process is to utilize waste iron filing, steel cuttings, corner blanking etc., through cold pressing, tie up, sintering processing, or direct throwing stove smelting molten iron in bulk, foundry iron piece.Produce foundry goods, the cupola furnace secondary smelting of also will packing into.This production process, both waste material expended man-hour again, and efficient is low, the energy consumption height, labour intensity is big, deficiency in economic performance.And utilize base iron (overheated) directly to pour into a mould gray iron casting without secondary, still there is not sophisticated method.Its reason has two, one, and the ironmaking starting material are assorted, the chemical ingredients instability, and fluctuation is big; The 2nd, ironmaking base iron is overheated without secondary, contains a large amount of gases and nonmetal oxide in the molten iron, and the molten iron viscosity is big, and mobile poor, castability worsens, and qualified casting generally is lower than 10%.

The objective of the invention is to change the backward situation of prior art,, take corresponding effective measure at the disadvantage that using melted waste iron filings base iron exists, proposes a kind of when molten iron is come out of the stove, through the stokehold purify, after rotten the processing, the technology of just direct pouring cast part.

This technology mainly is to utilize using melted waste iron filings base iron, and is overheated without the cupola furnace secondary, when molten iron is come out of the stove, handles by scavenging agent, overcomes the viscosity of base iron, increases its flowability, improves the ability that molten iron is full of casting mold; Handle by alterant, change the matrix and the graphite form of cast iron effectively, improved the metallographic structure of cast iron, guarantee that every performance index reach the GB requirement.In fact, through purification, molten iron after rotten the processing, can compare favourably with the molten iron of cupola melting, acquisition inner quality that can be successful reliably, exterior contour foundry goods clearly.

Purify rotten treatment process

1), material and proportioning

A, scavenging agent 0.2-0.4%(fluoaluminate are as potassium fluoroaluminate, sodium fluoroaluminate etc.);

B, alterant 0.2-0.6%(rare earth ferrosilicon alloy are as 1 ^#Rare earth ferrosilicon alloy);

C, nucleating agent should be added ferrosilicon (as 75 ferrosilicon) at any time according to the required amount of foundry goods to chemical ingredients.

2), purify the rotten condition of handling

A, molten iron tapping temperature are at 1380-1450 ℃;

B, stokehold test wedge, the spoken parts in traditional operas width is at 0-3mm;

C, base iron carbon and silicon equivalent close on eutectic composition.

3), purify the rotten method of handling

When the molten iron temperature of waiting to come out of the stove is stablized (is optimum with 1400 ℃), the scavenging agent and the alterant mixing that prepare in advance are divided into two equal portions, portion is put into the hot metal ladle of prior oven dry and preheating, portion is poured in the hot metal ladle by the iron notch following current, when treating that molten iron puts in place, fully stirring reaction 1-2 minute, after skim, topped again scavenging agent 0.1-0.2% can the subpackage pouring cast part.

This technology possess skills advanced person, technology rationally, the characteristics of less investment, instant effect.Can transform waste material on the spot, reduce shipping charges usefulness, reduce environmental pollution, effectively save energy reduces labor intensity, and shortens the production cycle, is beneficial to and develops production.Utilizing this explained hereafter foundry goods ton profit is former 7.5 times with cupola furnace production foundry goods, less investment, and output is many, and economical, societal benefits are remarkable, are suitable for and apply.

On the basis that utilizes waste iron filing, steel cuttings, the normal fusing ironmaking of corner blanking (without colding pressing or sintering processing), desire to produce the ironcasting of HT15-33, the rotten treatment process of its purification is:

1), treatment condition

Before not purifying rotten the processing, should note in advance grasping:

The tapping temperature of a, molten iron is about 1400 ℃;

The stokehold test wedge is observed in b, attention, and the spoken parts in traditional operas width is at 0-3mm;

C, from chemical analysis, the carbon and silicon equivalent ≈ 4.3% of base iron closes on eutectic composition;

D, molten iron should accurately be metered to bag, and permissible error 2%(handles iron water amount and should decide on the workpiece size).

2), purify rotten method

The fresh baked first bag base iron is not got, and when molten iron temperature to be come out of the stove is stabilized in 1400 ℃ of left and right sides, the potassium fluoroaluminate scavenging agent 0.3% for preparing is in advance added 1 ^#After mixing, rare earth ferrosilicon alloy alterant 0.3% is divided into two equal portions, portion is put into the good hot metal ladle of prior oven dry, another part poured in the hot metal ladle by the iron notch following current, when treating that molten iron puts in place, fully skim after stirring reaction 1-2 minute, topped again potassium fluoroaluminate scavenging agent 0.1-0.2% gets final product the subpackage pouring cast part, gets the cast iron flexure test bar simultaneously and makes performance test, metallographic examination and chemical analysis etc.

If when producing HT20-40 cast iron, the material and the proportioning that purify rotten processing are: scavenging agent 0.3% is with alterant 0.4%; If when producing HT10-26 cast iron, the material of processing and proportioning are: scavenging agent 0.3% adds nucleating agent 75 ferrosilicon 0.3%.

Claims

1, a kind of directly pouring casting technique using melted waste iron filings is characterized in that, utilizes ironmaking base iron, and is overheated without secondary, only when molten iron is come out of the stove, purifies rotten the processing through the stokehold, direct pouring cast part just,

Purifying rotten treatment process is:

1), material and proportioning

A, scavenging agent 0.2-0.4% (fluoaluminate)

B, alterant 0.2-0.6% (rare earth ferrosilicon alloy)

C, nucleating agent should be added ferrosilicon at any time according to the required amount of foundry goods to chemical ingredients

2), purify the rotten condition of handling

A, molten iron tapping temperature are at 1380-1450 ℃

B, stokehold test wedge, the spoken parts in traditional operas width is at 0-3mm

C, base iron carbon and silicon equivalent close on eutectic composition

3), purify the rotten method of handling

When the molten iron temperature of waiting to come out of the stove is stablized, the scavenging agent and the alterant mixing that prepare in advance are divided into two equal portions, portion is put into the hot metal ladle of prior oven dry and preheating, portion is poured in the hot metal ladle by the iron notch following current, when treating that molten iron puts in place, fully stirring reaction 1-2 minute, after skim, topped again scavenging agent 0.1-0.2% can the subpackage pouring cast part.

2,, it is characterized in that purifying the rotten scavenging agent of handling usefulness and can adopt potassium fluoroaluminate, sodium fluoroaluminate etc. by the described directly pouring casting technique using melted waste iron filings of claim 1.

3,, it is characterized in that purifying the rotten alterant of handling usefulness and can adopt 1 by the described directly pouring casting technique using melted waste iron filings of claim 1 ^#Rare earth ferrosilicon alloy.

4,, it is characterized in that the nucleating agent that is adopted can adopt 75 ferrosilicon by the described directly pouring casting technique using melted waste iron filings of claim 1.

5,, it is characterized in that purifying treatment molten iron tapping temperature is optimum for 1400 ℃ by the described directly pouring casting technique using melted waste iron filings of claim 1.