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Method for extending initiation time of nodulizer, environment-friendly nodulizer and preparation method thereof

A spheroidizing agent and time technology, applied in the field of metal casting, can solve the problems of segregation, affect the use effect, and unsatisfactory effect, and achieve the effects of preventing oxidation, improving productivity, and improving the ability to resist heat packs.

Inactive Publication Date: 2012-03-14
SHENZHEN FORAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the different particle sizes of nodulizers and other additives, other additives may be segregated and affect the use effect
[0008] Whether it is to use a slender spheroidizing bag, build a dam at the bottom of the spheroidizing bag, compact the spheroidizing agent, or add a flame retardant to the spheroidizing agent, these measures can reduce magnesium light and smoke to varying degrees and improve Magnesium absorption rate, but in actual production, due to the limitation of production conditions, the quality of operators, etc., sometimes the effect is not satisfactory, it is necessary to further optimize the nodulizer to produce easy-to-use, safe and effective nodulizer agent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1: Use 90 kilograms of conventional 8-5 spheroidizing agent, nominal composition of magnesium 8%, rare earth 5%, lumpness 5-40 mm; use 12 kilograms of garnet ore powder, particle size -60 mesh. Choose 8 kilograms of wollastonite ore powder with a particle size of -60 mesh. Pour the spheroidizing agent, garnet ore powder and wollastonite ore powder into a cement mixer, start the mixer to mix for 20 minutes, and then discharge the material, and sift off the excess powder to obtain a spheroidizing agent with a longer initiation time.

Embodiment 2

[0035] Example 2: Use 90 kilograms of conventional 8-5 spheroidizing agent, nominal composition is 8% magnesium, rare earth 5%, lumpness 5-40 mm; use 2 kilograms of water glass; use 8 kilograms of silicon carbide powder, particle size -60 mesh . Pour the spheroidizing agent into a cement mixer first, then pour the water glass on the spheroidizing agent, start the mixer and stir for 3 minutes, so that the water glass is evenly coated on the surface of the spheroidizing agent. Then pour the silicon carbide powder into the mixer, start the mixer to mix for 5 minutes, and then discharge the material to make the silicon carbide powder adhere to the surface of the spheroidizing agent. Finally, the spheroidizing agent coated with silicon carbide powder is sent to a drying furnace, and baked at 300 degrees for 3 hours. After the temperature of the baked spheroidizing agent is cooled down, it is divided into a ready product.

Embodiment 3

[0036] Example 3: Use 90 kg of conventional 8-5 spheroidizing agent, nominal composition of 8% magnesium, 5% rare earth, 5-40 mm block size; use 2 kg of water glass; use Tieshen No. 1 purification on the market The inoculant is 8 kilograms. First, pour the spheroidizing agent into a cement mixer, then pour the water glass on the spheroidizing agent, start the mixer and stir for 3 minutes, so that the water glass is evenly coated on the surface of the spheroidizing agent. Then pour the Tieshen No. 1 Purifying Inoculant into the mixer, start the mixer to mix for 5 minutes, and then discharge the material, so that the Tieshen No. 1 Purifying Inoculant will adhere to the surface of the nodulizer. Finally, the spheroidizing agent coated with Tieshen No. 1 Purifying Inoculant is sent to a drying furnace, and baked at 300 degrees for 3 hours. After the temperature of the baked spheroidizing agent is cooled down, the product is divided and packaged.

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Abstract

The invention discloses a method for extending initiation time of a nodulizer and a nodulizer with long initiation time (the environment-friendly nodulizer ). The method is characterized by coating a layer of heat insulating materials on the surface of the nodulizer. The nodulizer is protected by the layer of heat insulating materials, the temperature cannot be risen promptly, and detonation cannot occur promptly, thus the initiation time of the nodulizer is extended. The heat insulating material powder is coated on the surface of the nodulizer by mixing with the nodulizer with completely stirring, or by using a binder, or by mixing with a binder to form slurry.

Description

Technical field [0001] The present invention relates to the casting of metals, and more specifically, to the molten iron spheroidizing agent used in the casting process of ductile iron. The invention relates to a method for prolonging the detonation time of a spheroidizing agent, an environmentally-friendly spheroidizing agent (a spheroidizing agent with a long detonation time) and a preparation method thereof. technical background [0002] Spheroidizing treatment is a key link in the production of ductile iron. The process is to add a spheroidizing agent to the high temperature molten iron to promote the carbon in the cast iron to form nodular graphite. At present, the widely used spheroidizing agent is mainly rare earth magnesium ferrosilicon alloy, and the widely used spheroidizing method is the in-pack rushing method. [0003] The main components of rare earth magnesium ferrosilicon alloy spheroidizing agent include rare earth, magnesium, silicon and iron. According to diffe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/10C21C1/10
Inventor 刘玉林
Owner SHENZHEN FORAL TECH
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