CN106542530A

CN106542530A - 500 Φ of extrusion molding production major diameter Φ, 800 fine grained graphite manufacturing process

Info

Publication number: CN106542530A
Application number: CN201611114170.8A
Authority: CN
Inventors: 蒋莉
Original assignee: Baoshan Fengcheng Carbon Co Ltd
Current assignee: Baoshan Fengcheng Carbon Co Ltd
Priority date: 2016-12-07
Filing date: 2016-12-07
Publication date: 2017-03-29

Abstract

A kind of 500 Φ of extrusion molding production major diameter Φ of the present invention, 800 fine grained graphite manufacturing process, processing step are as follows：1) it is burnt with the mixing of pitch coke with petroleum coke or petroleum coke, bonding agent is done with modified coal tar pitch, carry out extrusion molding using 3500 tons of hydraulic presses；2), after the precompressed of kneading thickener evacuation, extruding becomes the green compact of 500 Φ 800mm of diameter of phi；3) by step 2) in green compact carry out a roasting, a roasting product density reaches 1.68g/cm³More than；4) a roasting product do impregnating agent using the high coking value impregnating pitch of low quinoline；5) become finished product Jing after graphitization process after fine vacuum high-pressure impregnation.The present invention adopts squash type processing technique, and the product length of production is unrestricted, and production efficiency is high；Finished product density is big, and conductivity is high.Improve the service efficiency of graphite electrode and increase the service life.

Description

800 fine grained graphite manufacturing process of extrusion molding production major diameter Φ 500-- Φ

Technical field

The present invention relates to New graphite material field, a kind of big straight with what is manufactured using new technology using new molding mode Footpath high-performance fine grained graphite material.

Background technology

With the field such as metallurgy, machinery, chemical industry to the increase of major diameter fine grained graphite materials demand with to material property The lifting of requirement, the fine grained graphite mechanical strength that original employing vibration moulding mode or compression molding mode are produced are low, conductive Poor-performing, when making heat exchanger, punching rate is relatively low, heat exchange area be limited, heat transfer rate with it is less efficient, service life also compared with Short, it is shorter to do rare metal smelting pot life, and it is short to do high temperature thermal field heater use time, does spark machined When loss it is big, when making machinery mould, wearability is poor, and service life is shorter, and these applications wish fine grained graphite material Material can improve service efficiency and increase the service life.

The content of the invention

It is an object of the invention to provide a kind of 800 fine grained graphite manufacture works of extrusion molding production major diameter Φ 500-- Φ Skill.

The technical solution used in the present invention is：

A kind of 800 fine grained graphite manufacturing process of extrusion molding production major diameter Φ 500-- Φ, processing step are as follows：

1) it is burnt with the mixing of pitch coke with petroleum coke or petroleum coke, bonding agent is done with high coking value modified coal tar pitch, adopt 3500 tons of hydraulic presses carry out extrusion molding；

2) after the precompressed of kneading thickener evacuation, extruding becomes the green compact of diameter of phi 500-- Φ 800mm, and green compact length reaches 3000mm, green density reach 1.77g/cm³More than；

3) by step 2) in green compact carry out a roasting, a roasting adopts car type furnace malleation roasting, a roasting product density Reach 1.68g/cm³More than；

4) a roasting product do impregnating agent using the high coking value impregnating pitch of low quinoline, through fine vacuum high-pressure impregnation, make once Product after roasting is further closely knit；Fine vacuum refers to the vacuum in the range of 1 × 10^-3 to 1 × 10^-6 millimetress of mercury；High pressure Refer to 50MPa≤p ＜ 100MPa；

5) become finished product Jing after graphitization process after fine vacuum high-pressure impregnation, finished product density reaches 1.75g/cm³More than, electricity Resistance rate is controlled 4.14-8.07 according to purposes, and intensity reaches more than 20MPa；Product granularity is regulated and controled according to purposes, granularity ≤0.8mm。

It is an advantage of the invention that：

The present invention adopts squash type processing technique, and the product length of production is unrestricted, and production efficiency is high；Finished product density Greatly, conductivity is high.Improve the service efficiency of graphite electrode and increase the service life.

Description of the drawings

Fig. 1 is the flow chart of the present invention.

Specific embodiment

With reference to accompanying drawing 1, the present invention is described in more detail.

1) it is burnt with the mixing of pitch coke with petroleum coke or petroleum coke, make of high coking value (coking value >=58%) modified coal tar pitch Bonding agent, carries out extrusion molding using 3500 tons of hydraulic presses；

3) by step 2) in green compact carry out a roasting, using car type furnace malleation roasting, (car type furnace is for a roasting Car type furnace in another patent of invention of the applicant's application), a roasting product density reaches 1.68g/cm³More than；

4) a roasting product do impregnating agent using low quinoline high coking value (coking value >=51%) impregnating pitch, high through fine vacuum Pressure dipping, makes the product after a roasting further closely knit；Fine vacuum refers to 1 × 10^-3 to 1 × 10^-6 millimetres of mercury scopes Interior vacuum；High pressure refers to 50MPa≤p ＜ 100MPa；

The step 1) in extrusion forming process manufacture major diameter fine grained graphite, product strength greatly improves, and relatively passes The vibro-moulding process product rupture strength of system improves 40%；Extrusion molding improves product electric conductivity in the longitudinal direction, More traditional vibration moulding or die press technology for forming product resistivity reduce by 35%；The thermal coefficient of expansion of length direction is reduced, compared with Traditional vibration moulding or die press technology for forming product resistivity are reduced, and 35%, and product length is unrestricted.

The step 3) bonding agent is done with the modified coal tar pitch of coking value >=58%, compared with the middle temperature of traditional mode of production fine grained graphite Colophonium greatly improves coking value, yield, density and intensity, and coking value is high by more than 7%, high income more than 5%, and density is high 0.025g/cm³More than.

The step 4) in a roasting adopt car type furnace malleation roasting, the uniformity of temperature is substantially improved, a roasting Qualification rate up to more than 99.8%, while a roasting yield reaches more than 94%.

The step 2) in using technique manufacture major diameter Φ 500-- Φ 800mm extruding fine grained graphite products Can be substantially improved, when product makees heat exchanger, heat exchange efficiency improves 20%, and service life improves 25%；Do the heating of high temperature thermal field Device use time extends 20%；When making machinery mould, service life extends 20%.

Claims

1. a kind of extrusion molding produces 800 fine grained graphite manufacturing process of major diameter Φ 500-- Φ, it is characterised in that：

Processing step is as follows：

1) it is burnt with the mixing of pitch coke with petroleum coke or petroleum coke, bonding agent is done with high coking value modified coal tar pitch, using 3500 tons Hydraulic press carries out extrusion molding；

3) by step 2) in green compact carry out a roasting, a roasting adopts car type furnace malleation roasting, a roasting product density to reach 1.68g/cm³More than；

4) a roasting product do impregnating agent using the high coking value impregnating pitch of low quinoline, through fine vacuum high-pressure impregnation, make a roasting Product afterwards is further closely knit；

5) become finished product Jing after graphitization process after fine vacuum high-pressure impregnation, finished product density reaches 1.75g/cm³More than, resistivity 4.14-8.07 is controlled according to purposes, intensity reaches more than 20MPa；Product granularity is regulated and controled according to purposes, and granularity≤ 0.8mm。

2. a kind of 800 fine grained graphites of extrusion molding production major diameter Φ 500-- Φ according to claim 1 manufacture work Skill, it is characterised in that：

The step 1) in extrusion forming process manufacture major diameter fine grained graphite, product strength is greatly improved, more traditional Vibro-moulding process product rupture strength improves 40%；Extrusion molding improves product electric conductivity in the longitudinal direction, relatively passes The vibration moulding of system or die press technology for forming product resistivity reduce by 35%；The thermal coefficient of expansion of length direction is reduced, more traditional Vibration moulding or die press technology for forming product resistivity reduce, 35%, and product length is unrestricted.

3. a kind of 800 fine grained graphites of extrusion molding production major diameter Φ 500-- Φ according to claim 1 manufacture work Skill, it is characterised in that：

The step 3) bonding agent is done with the modified coal tar pitch of coking value >=58%, compared with traditional mode of production fine grained graphite mid temperature pitch Coking value, yield, density and intensity are greatly improved, coking value is high by more than 7%, high income more than 5%, the high 0.025g/cm of density³ More than.

4. a kind of 800 fine grained graphites of extrusion molding production major diameter Φ 500-- Φ according to claim 1 manufacture work Skill, it is characterised in that：

The step 4) in a roasting adopt car type furnace malleation roasting, the uniformity of temperature is substantially improved, and a roasting is qualified Rate up to more than 99.8%, while a roasting yield reaches more than 94%.

5. a kind of 800 fine grained graphites of extrusion molding production major diameter Φ 500-- Φ according to claim 1 manufacture work Skill, it is characterised in that：

The step 2) in it is big using the major diameter Φ 500-- Φ 800mm extruding fine grained graphite properties of product of technique manufacture Width is lifted, and when product makees heat exchanger, heat exchange efficiency improves 20%, and service life improves 25%；Doing high temperature thermal field is made with heater With time lengthening 20%；When making machinery mould, service life extends 20%.