Can I work in Belgium with a Shenzhen family visa

I have a 6 months Shenzhen family visa given by the Spanish embassy. My ex is Spanish that's how I was able to obtain the visa. Unfortunately we are no longer together. I wish to ask if I can still use the visa to travel to Belgium and if it is possible to obtain a job with this visa. I still have 4 months left before it expires.

A visa is permission to enter the country (or Schengen area), it is not permission to work, especially in another country than the country that issued the visa.  To be able to work, you would need to have a residence permit after arrival, and if you are no longer a spouse of an EU citizen, you would not qualify for residency as a family member.