Sulfur Impregnation

I'm no expert but I would be surprised if you can find any liquid that sulphur will dissolve in, let alone one that could evaporate at a low temperature. You would most certainly need some product with catalysing ability to accomplish that I would think, but have not been able to find that either. I routinely try to dissolve sulphur in water for nutrient solutions for a biological process that we use and find it to be a very difficult task - it is even difficult forming a colloid as the particle size is critical.

The only method I have found that works is to use a fairly aggressive vortex type centrifugal mixer, and even then it will separate after it has been at rest for awhile. This may be an answer to you however - perhaps you could use water with a little surfactant added and mix the sulphur in with a vortex mixer, then apply to your application and use gentle radiant heat to evaporate the water off.

Pete.

Thanks Mr Pete for U'r concirn, I have found a method to dissolve Sulfur, it can be dissolved in Carbon Sulfide, but again its a bit dengerous to handle Carbon sulfide, why not studied in detail. If it can be help to your process somehow.

Regards

Rohit Anand-Goa-India

Your problem may not be with the sulfur at all. What I suspect is the surface tension of the stone. I suspect if you prep the stone with a surface modification agent (sufactant, titanates, silanes) you may have better results.

Thanks for the reply - You may be right since the sulfur do penetrate but is not able to retain itself in the pores , if some binding agent as you said are used for treatment before sulfur treatment, it may give better penetration. Pl help me if you can with some Surfactant/Silanes/titanates that can be used safely to treat the stones before sulfur dipping. The temprature on which we operate is 150-165 D Centigrade.

Regards

Rohit Anand

Hi,

sulfur is completely and readily dissoluble in carbon-disulfide.

Also in many other organic solvents - I have no list but I played with CS2.

Also in asphalt or in heavy mineral oil (from which it crystallises in beautiful submerged crystals in some deposits (Sicilia, Italy).

But this will not solve your problem as the evaporation of the solvent will create voids that you may not want - if not intended to act as chip reservoirs.

If your impregnation by vacuum and pressure is not complete you may have the wrong temperature at which sulfur is polymerising to a rubber-like non-liquid material or you may have blocked the capillarity of your rough stones by whatever material or contamination.

Have a microscopic look at the pores in a broken sample: are the pores open to the next ones? Measure gas or water penetration as indicator of open porosity.

RHABE

Thanks RHABE

Cs2, can be used to dissolve Sulfur, Pl suggest a safe method to do so. Is it dengerous as understood to use CS2 & at what temp does it evaporate or can be removed or seprated.

Rohit Anand.