Secured creditors are those who have security interest over some or all of the company assets, they are usually the first to get paid.
Fixed charge holders include banks and other asset-based lenders holding title over a company asset.
In a business Chapter 7 bankruptcy, the business is closed, all assets are liquidated by the bankruptcy trustee, and the proceeds from the business assets are paid out to the business's creditors.
Secured creditors are paid first as they are usually those who have security over some or all of the company assets.
The secured creditor will take back the property they've secured, or will be entitled to the proceeds from the liquidation of that specific property.