Homogenizer/subsampler for tar sand process streams

A homogenizer/subsampler comprising:

• a discrete open-topped vessel for collecting a bulk sample from which it is required to take one or more representative analysis-size subsamples, said vessel having mounted therein a substantially coaxial draft tube spaced from the vessel side and base walls, thereby forming an annular passage;
• support means comprising means for supporting the vessel;
• a head element carried by the support means and operative to seal the top opening of the vessel;
• means for bringing the vessel and head element together in sealing and closing engagement;
• said draft tube, head element and vessel combining to form a substantially elliptical flow path extending through the draft tube bore and annular passage;
• an impellor having a propellor and shaft, said shaft extending through the head element, whereby the propellor is positioned for operation in the draft tube, said shaft being in sealing engagement with the head element;
• means for driving the impellor to circulate the bulk sample along the flow path;
• a subsampling port extending through the side wall of the vessel and communicating with the flow path;
• mechanical means for opening and closing the port for withdrawal of a subsample;
• and
• means for pressurizing the bulk sample to cause the subsample to be expelled through the port when said port is in the open position.