Cast Steel Filtration Trials Using Ceramic-Carbon Filters

B. Lipowska; J. Witek; T. Wala; A. Karwiński; P. Wieliczko; M. Asłanowicz; A. Ościłowski

doi:10.2478/afe-2014-0087

Cast Steel Filtration Trials Using Ceramic-Carbon Filters

Archives of Foundry Engineering ◽

10.2478/afe-2014-0087 ◽

2014 ◽

Vol 14 (4) ◽

pp. 61-66 ◽

Cited By ~ 1

Author(s):

B. Lipowska ◽

J. Witek ◽

T. Wala ◽

A. Karwiński ◽

P. Wieliczko ◽

...

Keyword(s):

Surface Reaction ◽

Cast Steel ◽

Coal Tar ◽

The Other ◽

Coal Tar Pitch ◽

Carbon Precursor ◽

Flake Graphite ◽

Before And After ◽

Lower Temperature ◽

Secondary Contamination

Abstract Trials of cast steel filtration using two types of newly-developed foam filters in which carbon was the phase binding ceramic particles have been conducted. In one of the filters the source of carbon was flake graphite and coal-tar pitch, while in the other one graphite was replaced by a cheaper carbon precursor. The newly-developed filters are fired at 1000°C, i.e. at a much lower temperature than the currently applied ZrO2-based filters. During filtration trials the filters were subjected to the attack of a flowing metal stream having a temperature of 1650°C for 30 seconds. Characteristic of the filters’ properties before and after the filtration trial were done. It was found, that the surface reaction of the filter walls with molten metal, which resulted in local changes of the microstructure and phase composition, did not affect on expected filter lifetime and filtration did not cause secondary contamination of cast steel.

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Study on Preparation of Activated Carbon Precursor from Medium Temperature Coal Tar Pitch

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.726-731.712 ◽

2013 ◽

Vol 726-731 ◽

pp. 712-715 ◽

Cited By ~ 1

Author(s):

Shu Guang Ouyang ◽

Rong Guang Xu

Keyword(s):

Activated Carbon ◽

High Performance ◽

Coal Tar ◽

Absorption Capacity ◽

Carbonization Temperature ◽

Coal Tar Pitch ◽

Carbon Precursor ◽

Optimal Method ◽

Medium Temperature ◽

Adsorption Capacities

In order to explore the optimal method to prepare high performance activated carbon precursors from medium temperature coal tar pitch, orthogonal tests are adopted to study the effects of oxygen-blowing time in the pretreatment process as well as carbonization temperature and carbonization time in activation and carbonization processes on the adsorption capacities of activated carbon. Moreover, the effects of additives (coke powder and anionic surfactant) on the adsorption capacities of activated carbon are examined. The results show that the factors affecting the adsorption capacities of pitch-based activated carbon, in order of importance, are carbonization temperature, oxygen-blowing time, carbonization time and additives. The optimal conditions for preparation of activated carbon precursor from medium temperature pitch are: 4h for oxygen-blowing time, 400°C for carbonization temperature, 60 minutes for carbonization time and no additives. The iodine absorption capacity of the prepared activated carbon precursor which is activated for 100 min at 800°C is 1739mg/g.

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A New Type of Road Material Prepared from Coal Tar Pitch

Advanced Engineering Forum ◽

10.4028/www.scientific.net/aef.20.51 ◽

2017 ◽

Vol 20 ◽

pp. 51-56

Author(s):

Zhe Liu ◽

Peng Fei Liu ◽

Chong Liang Sun

Keyword(s):

Coal Tar ◽

Test Methods ◽

Standard Test ◽

Bending Test ◽

Coal Tar Pitch ◽

Temperature Property ◽

Technical Standards ◽

Before And After ◽

New Type ◽

Wheel Tracking

A new type of road material was made by modifying coal tar pitch with a kind of self-made compound modifier. According to technical standards “Standard Test Methods of Bitument and Bituminous Mixture for Highway Engineering” JTG E20-2011, the properties of modified coal-tar pitch (M-CTP) and its mixture were studied, the softening point, ductility and penetration of M-CTP were all up to standard. Moreover, the properties of M-CTP mixture were also investigated, the wheel tracking test showed the M-CTP mixture has a dynamic stability of 1511n/mm, which was higher than the requirement of ≥800n/mm. The beam bending test results indicated the low-temperature property of M-CTP mixture reach the standard of AH-70 mixture. The Freeze-thaw split test demonstated the water stability of M-CTP mixture meet the standard for using in asphalt pavement. In all, a new type of road material by modifying coal tar pitch was obtained and its properties meet the standard of AH-70. The additive amount of modifier was 15% and the optimum effect was attained. Moreover, the ultraviolet and visible spectrophotometer was used to test the content of benzopyrene (BaP) in CTP before and after modified by M. And the content decreased from 1.92% to 1.62%.

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Processes of Reclaiming Rubber and Their Relative Merits

Rubber Chemistry and Technology ◽

10.5254/1.3546675 ◽

1944 ◽

Vol 17 (2) ◽

pp. 544-550 ◽

Cited By ~ 3

Author(s):

E. W. B. Owen

Keyword(s):

Tensile Strength ◽

Surface Finish ◽

Thermal Process ◽

Large Scale ◽

New Products ◽

The Other ◽

Permanent Set ◽

Before And After ◽

Higher Temperature ◽

Lower Temperature

Abstract 1. A more complete reclamation is possible by the thermal and pan process than with the alkali process, and both the former effect a saving in time. 2. The thermal process calls for a higher temperature, but the after-treatment consumes less power for grinding. The pan process makes use of a lower temperature; but the expenditure of more power for grinding before and after treatment, as well as a drying period, are entailed. 3. The new products are neutral, and softer than alkali reclaim. 4. Accelerated with BA, stocks with these new types of reclaim give poor results. On the other hand, MBT offers good prospects, both for aging and acceleration. 5. Whether refined or not, the pan reclaim produced a tensile strength 95 per cent of alkali reclaim, and the thermal reclaim 80 per cent, in MBT stocks. 6. With modified acceleration, thermal reclaim stock can be made to give improved tensile properties. 7. Laboratory abrasion resistance of both new types was superior to the standard, the losses being 92 per cent and 74 per cent for thermal and pan reclaims, respectively. 8. The permanent set was lower despite the softener in the pan reclaim. 9. Despite the lack of refining, articles formed by extrusion from stocks containing thermal and pan reclaims compared favorably with those from alkali reclaim with regard to surface finish. 10. Thermal reclaim ages extremely well. Independent workers in the field of thermal reclaim have been able to exercise a finer control of the process, and a large scale plant is in course of erection as a result of the improvements effected. Further work is proceeding, and it is hoped that a product superior in all respects to alkali reclaim will be obtained.

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