In the UK alone, 152 workers were killed in 2009-2010  according to the Health and Safety Executive (HSE).

I take road traffic deaths during work, in particular lorry and taxi drivers, and deaths from chemicals or radiation aren't even included, only accidents at fixed workplaces. TUC refers to "around the world" but didn't include the international news release, which includes these details:

World Day for Safety and Health at Work 2011 - Worldwide events to focus on safety and health management systems for prevention and control of risks at work

According to ILO data, an estimated 337 million workplace accidents and 2.3 million deaths occur every year, with some 6,300 deaths per day.

This leads further to this pdf from 2009, which says:

The ILO estimates that each year about 2.3 million men and women die from work-related accidents and diseases including close to 360,000 fatal accidents and an estimated 1.95 million fatal workrelated diseases.

...Hazardous substances cause an estimated 651,000 deaths, mostly in the developing world. These numbers may be greatly under-estimated due to inadequate reporting and notification systems in many countries.