CN104889322A - Preparation method of inner-layer plate of nodular cast iron ball mill - Google Patents
Preparation method of inner-layer plate of nodular cast iron ball mill Download PDFInfo
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- CN104889322A CN104889322A CN201510301654.2A CN201510301654A CN104889322A CN 104889322 A CN104889322 A CN 104889322A CN 201510301654 A CN201510301654 A CN 201510301654A CN 104889322 A CN104889322 A CN 104889322A
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Abstract
The invention provides a preparation method of an inner-layer plate of a nodular cast iron ball mill. The method comprises the steps of burdening, weighing, smelting of molten iron, tapping, nodulizing, slagging-off, casting, quenching and low-temperature tempering; in the molten iron smelting process, molybdenum oxide powder added in a molybdenum alloying ball form is adopted to reduce in high-temperature molten iron for alloying molybdenum; a V-EPC vacuum evanescent mold is adopted to cast; and the casting afterheat is used for quenching. The preparation method of the inner-layer plate of the nodular cast iron ball mill uses the molybdenum alloying of direct reduction of molybdenum oxide in the high-temperature molten iron and the quenching of the casting afterheat, so that a lining plate of the ball mill has high hardness and excellent toughness, the production process is convenient, and the production cost is lower.
Description
Technical field
The present invention relates to a kind of preparation method of spheroidal graphite cast-iron ball mill inner plating, belong to field of mechanical technique.
Background technology
V-EPC founding casing with vacuum easily realizes mass production, provides advantage for reducing production cost; After testing: the hardness HRC50-52 of the nodular cast iron lining plate for ball mill of thickness 80mm, impact flexibility ak18-22J/cm after employing quench using casting waste heat+220oC temper
2, wearability is 1.5-2 times of High Manganese Steel Lining of Ball Mill of the same type; Therefore, quench using casting waste heat wearable ductile iron ball grinding machine lining board has that hardness is high, toughness is moderate, anti-wear performance is excellent, production technology is easy and the distinguishing feature such as production cost is lower.
Summary of the invention
The invention provides a kind of preparation method of spheroidal graphite cast-iron ball mill inner plating, carry out the alloying of molybdenum with molybdenum oxide direct-reduction in high temperature liquid iron and quench using casting waste heat not only makes ball grinding machine lining board have high rigidity and good toughness, production technology is easy and production cost is lower.
For solving above technical problem, the invention provides following technical scheme: a kind of preparation method of spheroidal graphite cast-iron ball mill inner plating, described ball mill inner plating is adapted at diameter and uses in the middle-size and small-size ball mill of below 2.5m, comprise batching, weighing, cast iron melting, tap a blast furnace, nodularization, skim, pour into a mould, quench and the step of lonneal, in cast iron melting process, adopt the molybdenum oxide powder added with molybdenum alloy pellet form in high temperature liquid iron, reduce the alloying of carrying out molybdenum, adopt V-EPC lost foam to pour into a mould, and utilize quench using casting waste heat.
Further, described batching and weighing refer to: supply molybdenum agent to be the technical pure molybdenum oxide MoO3 powder that market is sold, Mo content 48-52wt%; Before using, granularity need be crushed to and be less than 2mm; Reducing agent is coke powder particle, and granularity is less than 1mm; According to coke powder particle during use: the weight ratio of molybdenum oxide powder 0.6-0.8:1 carries out weighing and mixing; Adding water glass solution in mixed powder after mixed mixes wet, and is pressed into the molybdenum alloy bead of Ф 15-20mm in a mold.
Further, the chemical composition of the spheroidal graphite cast-iron of described ball mill inner plating is: 2.8-3.3wt%C, 2.5-3.3wt%Si, 0.8-1.2wt%Mn, 0.5-0.6wt%Mo, 0.6-0.8wt%Cu, 0.02-0.04wt%R, remaining, 0.03-0.05wt%Mg is remaining, P≤0.05wt%, S≤0.03wt%.
Further, described cast iron melting, tap a blast furnace, nodularization, the step of skimming be:
Molten iron carries out melting or melting in medium-frequency induction furnace in furnace cupola; If with cupola melting, molybdenum alloy bead should directly join in furnace cupola; If use medium-frequency induction furnace melting, molybdenum alloy bead should join crucible bottom when starting to smelt; The addition of molybdenum alloy bead calculates according to the molybdenum content in molybdenum oxide and the target content in spheroidal graphite cast-iron, and the rate of recovery of molybdenum calculates according to 95%; Prepare when molten iron temperature reaches 1450oC-1480oC to tap a blast furnace; Employing is specifically designed to the dam-type ladle of carrying out spheroidising and connects molten iron, and before tapping a blast furnace, nodulizer is joined dam base, the addition of nodulizer is the 1.0-1.8wt% of weight of molten iron;
After tapping a blast furnace, in ladle, carry out spheroidising, inovulant joined molten iron surface and stir, the addition of inovulant is the 1.0-1.5% of weight of molten iron.
Further, the step of described cast, quenching and lonneal is: will add inovulant and molten iron after stirring pours in the sandbox being embedded with ball mill inner plating EPS sectional pattern in advance, before molten iron pours into, V-EPC founding casing with vacuum system has been among normal duty; After cast terminates, continue to keep V-EPC to turn off vavuum pump after system works 12-15 minute; Taken out from sandbox by foundry goods and together quench together with dead head after carrying out removing surface simply and carry out Quenching Treatment in quenching bath, quenching medium is water glass solution; After foundry goods is cooled to room temperature, it is taken out from quenching bath; Spruing and carry out the temper of 220oC/4 hour after carrying out removing surface.
Further, selecting the trade mark to be the hi-quality foundry pig irons of Q16 or Q18 is raw material; 6# RE-Mg-ferrosilicon alloy (4-6wt%RE, 8-10wt%Mg) is nodulizer, and granularity is less than 10mm; 75Fe-Si is inovulant, and granularity is less than 10mm.
The preparation method of this spheroidal graphite cast-iron ball mill inner plating that the present invention relates to, utilize molybdenum oxide direct-reduction in high temperature liquid iron to carry out the alloying of molybdenum and quench using casting waste heat not only makes ball grinding machine lining board have high rigidity and good toughness, production technology is easy and production cost is lower.
Detailed description of the invention
A kind of preparation method of spheroidal graphite cast-iron ball mill inner plating, described ball mill inner plating is adapted at diameter and uses in the middle-size and small-size ball mill of below 2.5m, comprise batching, weighing, cast iron melting, tap a blast furnace, nodularization, skim, pour into a mould, quench and the step of lonneal, in cast iron melting process, adopt the molybdenum oxide powder added with molybdenum alloy pellet form in high temperature liquid iron, reduce the alloying of carrying out molybdenum, adopt V-EPC lost foam to pour into a mould, and utilize quench using casting waste heat.
Described batching and weighing refer to: supply molybdenum agent to be the technical pure molybdenum oxide MoO3 powder that market is sold, Mo content 48-52wt%; Before using, granularity need be crushed to and be less than 2mm; Reducing agent is coke powder particle, and granularity is less than 1mm; According to coke powder particle during use: the weight ratio of molybdenum oxide powder 0.6-0.8:1 carries out weighing and mixing; Adding water glass solution in mixed powder after mixed mixes wet, and is pressed into the molybdenum alloy bead of Ф 15-20mm in a mold.
The chemical composition of the spheroidal graphite cast-iron of described ball mill inner plating is: 2.8-3.3wt%C, 2.5-3.3wt%Si, 0.8-1.2wt%Mn, 0.5-0.6wt%Mo, 0.6-0.8wt%Cu, 0.02-0.04wt%R, remaining, 0.03-0.05wt%Mg is remaining, P≤0.05wt%, S≤0.03wt%.
Described cast iron melting, tap a blast furnace, nodularization, the step of skimming be:
Molten iron carries out melting or melting in medium-frequency induction furnace in furnace cupola; If with cupola melting, molybdenum alloy bead should directly join in furnace cupola; If use medium-frequency induction furnace melting, molybdenum alloy bead should join crucible bottom when starting to smelt; The addition of molybdenum alloy bead calculates according to the molybdenum content in molybdenum oxide and the target content in spheroidal graphite cast-iron, and the rate of recovery of molybdenum calculates according to 95%; Prepare when molten iron temperature reaches 1450oC-1480oC to tap a blast furnace; Employing is specifically designed to the dam-type ladle of carrying out spheroidising and connects molten iron, and before tapping a blast furnace, nodulizer is joined dam base, the addition of nodulizer is the 1.0-1.8wt% of weight of molten iron;
After tapping a blast furnace, in ladle, carry out spheroidising, inovulant joined molten iron surface and stir, the addition of inovulant is the 1.0-1.5% of weight of molten iron.
The step of described cast, quenching and lonneal is: will add inovulant and molten iron after stirring pours in the sandbox being embedded with ball mill inner plating EPS sectional pattern in advance, before molten iron pours into, V-EPC founding casing with vacuum system has been among normal duty; After cast terminates, continue to keep V-EPC to turn off vavuum pump after system works 12-15 minute; Taken out from sandbox by foundry goods and together quench together with dead head after carrying out removing surface simply and carry out Quenching Treatment in quenching bath, quenching medium is water glass solution; After foundry goods is cooled to room temperature, it is taken out from quenching bath; Spruing and carry out the temper of 220oC/4 hour after carrying out removing surface.
Selecting the trade mark to be the hi-quality foundry pig irons of Q16 or Q18 is raw material; 6# RE-Mg-ferrosilicon alloy (4-6wt%RE, 8-10wt%Mg) is nodulizer, and granularity is less than 10mm; 75Fe-Si is inovulant, and granularity is less than 10mm.
The preparation method of this spheroidal graphite cast-iron ball mill inner plating that the present invention relates to, utilize molybdenum oxide direct-reduction in high temperature liquid iron to carry out the alloying of molybdenum and quench using casting waste heat not only makes ball grinding machine lining board have high rigidity and good toughness, production technology is easy and production cost is lower.
Detailed description of the invention of the present invention does not form the restriction to the application's scope; within every spirit in the present invention's design and principle, any amendment that one of skill in the art can make, equivalent to replace and improvement etc. all should be included within protection scope of the present invention.
Claims (6)
1. the preparation method of a spheroidal graphite cast-iron ball mill inner plating, it is characterized in that: comprise batching, weighing, cast iron melting, tap a blast furnace, nodularization, skim, pour into a mould, quench and the step of lonneal, in cast iron melting process, adopt the molybdenum oxide powder added with molybdenum alloy pellet form in high temperature liquid iron, reduce the alloying of carrying out molybdenum, adopt V-EPC lost foam to pour into a mould, and utilize quench using casting waste heat.
2. the preparation method of a kind of spheroidal graphite cast-iron ball mill inner plating as claimed in claim 1, it is characterized in that, described batching and weighing refer to: supply molybdenum agent to be the technical pure molybdenum oxide MoO3 powder that market is sold, Mo content 48-52wt%; Before using, granularity need be crushed to and be less than 2mm; Reducing agent is coke powder particle, and granularity is less than 1mm; According to coke powder particle during use: the weight ratio of molybdenum oxide powder 0.6-0.8:1 carries out weighing and mixing; Adding water glass solution in mixed powder after mixed mixes wet, and is pressed into the molybdenum alloy bead of Ф 15-20mm in a mold.
3. the preparation method of a kind of spheroidal graphite cast-iron ball mill inner plating as claimed in claim 1, it is characterized in that, the chemical composition of the spheroidal graphite cast-iron of described ball mill inner plating is: 2.8-3.3wt%C, 2.5-3.3wt%Si, 0.8-1.2wt%Mn, 0.5-0.6wt%Mo, 0.6-0.8wt%Cu, 0.02-0.04wt%R, remaining, 0.03-0.05wt%Mg is remaining, P≤0.05wt%, S≤0.03wt%.
4. the preparation method of a kind of spheroidal graphite cast-iron ball mill inner plating as claimed in claim 1, is characterized in that, described cast iron melting, tap a blast furnace, nodularization, the step of skimming be:
Molten iron carries out melting or melting in medium-frequency induction furnace in furnace cupola; If with cupola melting, molybdenum alloy bead should directly join in furnace cupola; If use medium-frequency induction furnace melting, molybdenum alloy bead should join crucible bottom when starting to smelt; The addition of molybdenum alloy bead calculates according to the molybdenum content in molybdenum oxide and the target content in spheroidal graphite cast-iron, and the rate of recovery of molybdenum calculates according to 95%; Prepare when molten iron temperature reaches 1450oC-1480oC to tap a blast furnace; Employing is specifically designed to the dam-type ladle of carrying out spheroidising and connects molten iron, and before tapping a blast furnace, nodulizer is joined dam base, the addition of nodulizer is the 1.0-1.8wt% of weight of molten iron;
After tapping a blast furnace, in ladle, carry out spheroidising, inovulant joined molten iron surface and stir, the addition of inovulant is the 1.0-1.5% of weight of molten iron.
5. the preparation method of a kind of spheroidal graphite cast-iron ball mill inner plating as claimed in claim 1, it is characterized in that, the step of described cast, quenching and lonneal is: will add inovulant and molten iron after stirring pours in the sandbox being embedded with ball mill inner plating EPS sectional pattern in advance, before molten iron pours into, V-EPC founding casing with vacuum system has been among normal duty; After cast terminates, continue to keep V-EPC to turn off vavuum pump after system works 12-15 minute; Taken out from sandbox by foundry goods and together quench together with dead head after carrying out removing surface simply and carry out Quenching Treatment in quenching bath, quenching medium is water glass solution; After foundry goods is cooled to room temperature, it is taken out from quenching bath; Spruing and carry out the temper of 220oC/4 hour after carrying out removing surface.
6. the preparation method of a kind of spheroidal graphite cast-iron ball mill inner plating as claimed in claim 4, is characterized in that: selecting the trade mark to be the hi-quality foundry pig irons of Q16 or Q18 is raw material; 6# RE-Mg-ferrosilicon alloy (4-6wt%RE, 8-10wt%Mg) is nodulizer, and granularity is less than 10mm; 75Fe-Si is inovulant, and granularity is less than 10mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510301654.2A CN104889322A (en) | 2015-06-05 | 2015-06-05 | Preparation method of inner-layer plate of nodular cast iron ball mill |
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| CN201510301654.2A CN104889322A (en) | 2015-06-05 | 2015-06-05 | Preparation method of inner-layer plate of nodular cast iron ball mill |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105821287A (en) * | 2016-05-26 | 2016-08-03 | 山东汇丰铸造科技股份有限公司 | High-performance spheroidal graphite cast iron and preparation method thereof |
| CN108746508A (en) * | 2018-07-03 | 2018-11-06 | 宁波力古机械制造有限公司 | A kind of production technology of more alloy cylinder caps |
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| US5034069A (en) * | 1988-07-15 | 1991-07-23 | Norcast Corporation | Low white cast iron grinding slug |
| CN103014482A (en) * | 2012-12-28 | 2013-04-03 | 山东省源通机械股份有限公司 | Metal material produced from heat-resistant and corrosion-resistant austenite nodular cast iron and manufacturing method thereof |
| CN103436772A (en) * | 2013-09-05 | 2013-12-11 | 常州华德机械有限公司 | Low-temperature tough ferrite nodular cast iron of 60 DEG C below zero and preparation method thereof |
| CN103586440A (en) * | 2013-10-29 | 2014-02-19 | 青岛高校重工机械制造有限公司 | Preparation method of steel base surface composite |
| CN104152789A (en) * | 2014-08-06 | 2014-11-19 | 江苏大学 | Preparation method of wear-resistant ductile cast iron ball mill lining board quenched by residual heat |
-
2015
- 2015-06-05 CN CN201510301654.2A patent/CN104889322A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5034069A (en) * | 1988-07-15 | 1991-07-23 | Norcast Corporation | Low white cast iron grinding slug |
| CN103014482A (en) * | 2012-12-28 | 2013-04-03 | 山东省源通机械股份有限公司 | Metal material produced from heat-resistant and corrosion-resistant austenite nodular cast iron and manufacturing method thereof |
| CN103436772A (en) * | 2013-09-05 | 2013-12-11 | 常州华德机械有限公司 | Low-temperature tough ferrite nodular cast iron of 60 DEG C below zero and preparation method thereof |
| CN103586440A (en) * | 2013-10-29 | 2014-02-19 | 青岛高校重工机械制造有限公司 | Preparation method of steel base surface composite |
| CN104152789A (en) * | 2014-08-06 | 2014-11-19 | 江苏大学 | Preparation method of wear-resistant ductile cast iron ball mill lining board quenched by residual heat |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105821287A (en) * | 2016-05-26 | 2016-08-03 | 山东汇丰铸造科技股份有限公司 | High-performance spheroidal graphite cast iron and preparation method thereof |
| CN105821287B (en) * | 2016-05-26 | 2017-10-03 | 山东汇丰铸造科技股份有限公司 | A kind of high performance spheroidal graphite cast-iron and preparation method thereof |
| CN108746508A (en) * | 2018-07-03 | 2018-11-06 | 宁波力古机械制造有限公司 | A kind of production technology of more alloy cylinder caps |
| CN108746508B (en) * | 2018-07-03 | 2020-10-16 | 宁波力古机械制造有限公司 | Production process of multi-alloy cylinder cover |
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Application publication date: 20150909 |