Process for treating particulate material containing heavy metal and an additive for use in such process

A process for treating and collecting heavy metal contaminated dust generated during a manufacturing process comprising:

• passing particulate material through at least one enclosed area and toward a waste collection device;
• feeding a particulate calcium silicate forming material comprising calcium silicate forming material into the enclosed area to be mixed with the particulate material to create an additive-particulate material, upstream from the waste collection device;
• and
• passing the additive-particulate material mixture into the waste collection device
• wherein the particulate calcium silicate forming material comprises particles having the following size fraction ranges:
• minus 50 to plus 60 mesh:
• 10-20% by weight
• minus 60 to plus 70 mesh:
• 5-15% by weight
• minus 70 to plus 80 mesh:
• 2-10% by weight
• minus 80 to plus 100 mesh:
• 5-15% by weight
• minus 100 to plus 140 mesh:
• 10-20% by weight
• minus 140 to plus 170 mesh:
• 5-15% by weight
• minus 170 to plus 300 mesh:
• 40-50% by weight.

A process for collecting and pre-treating metallic oxide impregnated dust, generated in a manufacturing unit during a manufacturing process, comprising the steps of:

• passing metallic oxide impregnated dust in an air or fluid stream from an industrial process to a waste generation point and a waste collection device;
• injecting a particulate material consisting essentially of calcium silicate forming material into the metallic oxide impregnated dust stream generated by the industrial process at a point upstream from the waste collection device;
• and
• collecting the blended metallic oxide impregnated dust and particulate calcium silicate forming material in a waste collection device
• wherein the particulate calcium silicate forming material comprises particles having the following size fraction ranges:
• minus 50 to plus 60 mesh:
• 10-20% by weight
• minus 60 to plus 70 mesh:
• 5-15% by weight
• minus 70 to plus 80 mesh:
• 2-10% by weight
• minus 80 to plus 100 mesh:
• 5-15% by weight
• minus 100 to plus 140 mesh:
• 10-20% by weight
• minus 140 to plus 170 mesh:
• 5-15% by weight
• minus 170 to plus 300 mesh:
• 40-50% by weight.

A process for collecting and pre-treating metallic oxide impregnated dust, generated in a manufacturing unit during a manufacturing process, comprising the steps of:

• passing metallic oxide impregnated dust in an air or fluid stream from an industrial process to a waste generation point and a waste collection device;
• injecting a particulate material consisting essentially of calcium silicate forming material into the metallic oxide impregnated dust stream generated by the industrial process at a point upstream from the waste collection device;
• and
• collecting the blended metallic oxide impregnated dust and particulate material in a waste collection device
• wherein the particulate calcium silicate forming material comprises particles having the following size fraction ranges:
• minus 50 to plus 60 mesh:
• 10-20% by weight
• minus 60 to plus 70 mesh:
• 5-15% by weight
• minus 70 to plus 80 mesh:
• 2-10% by weight
• minus 80 to plus 100 mesh:
• 5-15% by weight
• minus 100 to plus 140 mesh:
• 10-20% by weight
• minus 140 to plus 170 mesh:
• 5-15% by weight
• minus 170 to plus 300 mesh:
• 40-50% by weight.