Process for the treatment of slimes and waste solids

{
  "publication_number": "US3680698A",
  "country": "US",
  "kind": "A",
  "title": "Process for the treatment of slimes and waste solids",
  "abstract": "Fine solids contained in liquids are more effectively compacted to a handleable state by the addition of a liquid coagulant reaction mass to flocculate the solids followed by settling the flocculated solids with slow agitation to compact the solids and form a clarified liquid. Additional liquid may then be extracted from the compacted solids by slowly agitating the solids while in contact with a sand filter. Alternatively, the addition of sand to the flocculated solids results in the formation of a homogeneous, highly porous aggregate which rapidly compacts, without agitation, to a high solids density.",
  "claims": [
    "2. A process as claimed in claim 1 in which the liquid coagulant reaction mass is added to the liquid suspension with high shear agitation.",
    "3. A process as claimed in claim 1 in which the liquid coagulant reaction mass is added to the liquid suspension in at least two flocculation stages with intermediate settling of the flocculated solids, with agitation, between additions of the liquid coagulant reaction mass.",
    "4. A process as claimed in claim 1 in which the coagulant is added to the liquid suspension in a tOtal amount of from about 10 to about 1,000 parts per million parts particulate solids.",
    "5. A process as claimed in claim 1 in which the water soluble polyelectrolyte coagulant contains an interpolymerized amount of at least one vinyl carboxamide sulfate which undergoes vinyl polymerization.",
    "6. A process as claimed in claim 1 in combination with the steps of: a. passing the partially compacted solids to a porous filter media; b. further compacting the flocculated solids by slowly agitating flocculated solids in contact with the porous filter media.",
    "7. A process as claimed in claim 6 in which the porous filter media is a sand filter.",
    "8. A process as claimed in claim 1 in combination with the steps of: a. admixing sand with the flocculated solids when said flocculated solids are at least at a solids concentration of ten percent by weight; b. passing flocculated solids-sand mixture to a porous filter media; c. further compacting the mixture in contact with the porous filter.",
    "9. A process as claimed in claim 8 in which the porous filter media is sand filter.",
    "10. A process as claimed in claim 8 in which sand is admixed with flocculated solids in an amount of from about 50 to about 150 percent by weight based on the weight of the flocculated solids.",
    "11. A process as claimed in claim 8 in combination with passing the compacted mixture of solids and sand to a settling pond.",
    "12. A process as claimed in claim 11 in which the settling pond is a sand bottom pond.",
    "13. A process as claimed in claim 12 in which the sand bottom pond is equipped with drainage tiles.",
    "14. A process as claimed in claim 1 in which the partially compacted solids are centrifuged to further compact the solids.",
    "15. A process as claimed in claim 1 in combination with the steps of: a. admixing sand with the partially compacted flocculated solids when said partially compacted solids are at least at a solids concentration of at least ten percent by weight; b. passing the mixture of sand and flocculated solids to a settling pond.",
    "16. A process as claimed in claim 15 in which the settling pond is a sand bottom pond.",
    "17. A process as claimed in claim 16 in which the sand bottom pond is equipped with drainage tiles.",
    "18. A process as claimed in claim 15 in which sand is added in an amount of from about 50 to 150 percent by weight based on the weight of the compacted flocculated solids.",
    "19. A process as claimed in claim 6 in combination with the additional steps of: a. mixing the filtered compacted solids with sand; b. passing the combined mixture of compacted filtered solids and sand to a settling pond.",
    "20. A process as claimed in claim 19 in which the settling pond is a sand bottom pond.",
    "21. A process as claimed in claim 20 in which the sand bottom pond is equipped with drainage tiles.",
    "22. A process as claimed in claim 6 in which the compacted solids are scraped from the surface of the porous filter media while compacting solids are agitated.",
    "23. A process as claimed in claim 1 in which the liquid suspension is sewage.",
    "24. A process as claimed in claim 1 in which the liquid suspension is an industrial waste.",
    "25. A process as claimed in claim 1 in which the liquid suspension is a slime.",
    "26. A process as claimed in claim 25 in which the slime is a phosphate slime.",
    "27. A process as claimed in claim 26 in which gypsum is added with the liquid coagulant reaction mass to the phosphate slime in the flocculation stage in an amount of from solution saturation to one percent in excess of solution saturation."
  ],
  "cpc": [
    "C02F 1/54",
    "B01D 21/00",
    "B01D 21/01",
    "B01D 21/02",
    "C02F 1/52",
    "Y10S 210/907"
  ],
  "assignees": [
    "OCCIDENTAL PETROLEUM CORP"
  ],
  "filing_date": "1970-02-25",
  "publication_date": "1972-08-01",
  "grant_date": "1972-08-01",
  "priority_date": "1970-02-25",
  "application_number": "US-3680698D-A",
  "family_id": "21763877",
  "citations": [
    "GB816575A",
    "US2108168A",
    "US2381514A",
    "US2947418A",
    "US3320136A",
    "US3480761A"
  ]
}