I need to know a few online marketplaces where businesses can sell industrial goods.
There are quite some marketplaces online like industrykart or Tolexo. Also I believe Indiamart also have a section of Industry goods. You may try exploring them. Depending on what you buy or sell you may try some relevant blogs and try doing affiliate programs with them via hosting the products on your own website, if you are able to crack this, you may create a marketplace of your own!
There are many online marketplaces over the Internet, some are fraud while some deliver good quality products and I have experienced both, after getting fake products many times I found a website called Coupon Codest which was offering voucher codes so I tried that too, and eventually, it turned out to be the best online shopping experience for me.