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.
Thanks in advance.





RE: Hi-Chrome Iron and Caustic Soda
RE: Hi-Chrome Iron and Caustic Soda
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.
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Corrosion never sleeps, but it can be managed.
http://www.trenttube.com/Trent/tech_form.htm
RE: Hi-Chrome Iron and Caustic Soda
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
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?