Hey bro, I understand your pride in your job and I have a lot of respect for you and that.
Work Comp insurance for these kind of work absences suck because you don't get your full salary, normally.
It's not my business, but your employer is liable for your pain and suffering, and probably lost wages also awarded in a court.
I'm not a lawyer, but the company is responsible for your safety while you are working for them, and it sounds like you were sent in there to clean up the spill with obviously inadequate safety gear--the burns are the proof of that, and you suffered massive exposure.
I wish you well my friend. You think about getting yourself a good lawyer? Seems like there'd be plenty to go to bat for you, you're gonna have some scars there I guess. Normally, I think the employer is responsible for your safety, sounds like they tested those boundaries.
Of course, you go after them and you probably get cut out of the job at some point, they'll hate that, so you have to consider that as well, but it sounds like *&%# to me.
More than anything, just wish you well, bro and to your family as well. If you can seek other work, I'd seek a lawyer too, I guess a work comp type one. They'd probably slather their mouths over you because they are going to take home the lion's share.
Again, just an armchair phone-a-friend from here, and not really my business but wish you the best
Kindly,