×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Hi-Chrome Iron and Caustic Soda

Hi-Chrome Iron and Caustic Soda

Hi-Chrome Iron and Caustic Soda

(OP)
There is 2% caustic soda and some cyanide in the ore slurry (up to 25% solids). Slurry temperature can be up to 150F. I need to find right pump material to pump it. Alloy 2205 may be ok except cost is to high. Does anyone know if Hi-Chrome (Hardness 600)is good for this service? Or any other material? Checked rubber lining, CD4MCu, not good.
Thanks in advance.

RE: Hi-Chrome Iron and Caustic Soda

High chrome iron pumo offers a cost effective solution for your requirement. We have been manufacturing these pump parts which are used in the mining industry regularly.

RE: Hi-Chrome Iron and Caustic Soda

White Cr Cast Iron should work, as long as there is no shock or impact.  The stuff is brittle.
I can't imagine that it is less expensive than 2205, CrI isn't cheap.
You could also look at lean duplex stainless grades.  I haven't kept up on the cast grades but on the sheet and plate side there are a number of newer, lower Ni alloys that are less expensive.  One of the high Mn alloys may also offer better wear resistance.

= = = = = = = = = = = = = = = = = = = =
Corrosion never sleeps, but it can be managed.
http://www.trenttube.com/Trent/tech_form.htm

RE: Hi-Chrome Iron and Caustic Soda

bulkhandling;
I agree with arunmrao. IF you are handling an ore slurry, your biggest problem will be erosion/abrasion damage to pump internals. If this is a pulverized ore slurry, I don't think 2205 is going to last.

We handle boiler bottom ash slurry (75% suspended solids) using Ni-Hard pump components. Ni-Hard castings are extremely resistant to abrasion and flow erosion damage from suspended solids. The Ni-Hard casting grades are readily available, exhibit excellent corrosion resistance (due to nickel and silicon additions), and are cost effective to use for pump slurry impellers. The only down sides to using certain grades of Ni-Hard castings is very poor toughness (as EdStainless mentioned), and it is not conducive to weld repairs. You must eventually replace worn or cracked pump components.


RE: Hi-Chrome Iron and Caustic Soda

(OP)
Thank you all for the information. We use Hi-Chrome (similar to Ni-Hard as mentioned by metengr as I can remember) a lot to handle regular slurries. Now I know that hi-chrome can also be used for the condition I mentioned above. Hi-chrome can be much cheaper than Alloy 2205 (about 50 to 80% lower in price as I checked with a few vendors).

But still I may have to use Alloy 2205 in one of the services where besides the conditions I mentioned above, nitric acid (2%) will also be pumped accasionally. Fortunately the pump will run intermittently. Since Alloy 2205 has Brinell hardness of 260 (?), I think it will be ok.
Any thought?

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources