Method for producing a granular material and product obtained
AssigneeSem Stone
InventorsJean-Pierre Camp, Serge Bensaid
Life of this patent
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Abstract
A method for producing a free-flowing granular material includes screening pumice and mixing it with sludge issuing from the biological treatment of municipal or industrial wastewater.
Claims8
A method for producing a free-flowing granular material comprising the steps of providing a pumice having a size in the range of from about 500 mu to about 15 mm, mixing the pumice with water, separating the water from the pumice and drying the pumice to form dried pumice, combining one part by weight of sludge from a biological treatment of municipal or industrial waste water with from about 0.5 to about 0.9 part by weight of the dried pumice to form the free-flowing granular material comprising granules of the combined sludge and dried pumice.
A method for producing a free-flowing granular material comprising the steps of providing a pumice having a size in the range of from about 500 mu to about 15 mm and a porous structure including pores, cleaning said pumice to remove debris contained in said pores, combining one part by weight of sludge from a biological treatment of municipal or industrial waste water with from about 0.5 to about 0.9 part by weight of the pumice to form the free-flowing granular material comprising granules of the combined sludge and dried pumice.
A granular free-flowing material having a maximum dimension between about 0.5 mm and 15 mm and the following elemental analysis by weight:
- H2O, 45% to 60%;
- Si, expressed as SiO2, 22% to 25%;
- Al, expressed as Al2O3, 6% to 9%;
- C, 4% to 5%;
- and
- Organic matter (loss on ignition), 1% to 3%.
Dependencies are inferred from the claim text.