High Temp Sulfuric resistant materials

• Jun 17, 2003

• #2

kenvlach

Materials

Apr 12, 2000

2,514

US

Due to the abrasive slurry, cannot recommend any coated material.

Metals Handbook, 9th. Edn., Vol. 13, Corrosion, pp. 1152-1153, and the corrosion resistance chart from Astro-Cosmos

http://www.astrocosmos.com/pdf/chart.pdf

both indicate that you can safely use zirconium or tantalum
(unalloyed) at the sulfuric acid boiling point.

 

Upvote 0 Downvote

• Jun 17, 2003

• #3

hacksaw

Mechanical

Dec 7, 2002

2,587

US

what kind of pumps are you using?

 

Upvote 0 Downvote

• Jun 17, 2003

• Thread starter
• #4

twalicia

Chemical

Jun 16, 2003

5

MY

Hacksaw, we don't use a pump. As the vessel is pressurised, we relieve the pressure from 4 bar to about 1.5 - 2 bar, then the slurry is sort of push through into a holding tank where we quench it to lower temp.

However, there is a hast-C valve at the bottom of the vessel.

 

Upvote 0 Downvote

• Jun 18, 2003

• #5

hacksaw

Mechanical

Dec 7, 2002

2,587

US

sounds like a laterite ore digester; that's pretty rough service

if the valve is holding up, then you have a starting point for your materials selection, but you may need some hardfacing. Hast.C(C-276) valves are generally cast and are a slightly different from the plate and bar stock you'd be using to fabricate an agitator.

 

Upvote 0 Downvote

• Jun 25, 2003

• #6

BRT549

Chemical

Dec 27, 2002

115

US

There are a number of coatings you can put on the agitator. Epoxy-based (or vinyl-ester) with silica sand filler might work for both corrosion and erosion.

 

Upvote 0 Downvote