The melting point of sulfur is 115 degrees C, so it will tend to solidify, but it rather depends on how much is spilt. The latent heat of fusion has to leak away for solidification to take place. If the atmosphere around it is normal (i.e. oxidising) I would not expect H2S. If it were to catch fire, you would get highly toxic sulfur dioxide. What is lying about in the bund?

As Jane says your problem is sulphur oxides rather than H2S - this latter is the product of organic decomposition rather than combustion. Generally speaking you can cool it rapidly with cold water and you then get an unusual form of sulphur - much like chewing gum in consistency and red brown in colour. This will revert to the normal yellow suphur in a matter of hours. In the solid form sulphur is relatively innocuous, subject to dust control if needed. Bob