초록 ▼

A method of treating solid containing material derived from effluent or sludge from a plant for deinking paper, the material containing calcium in the form of one or more insoluble calcium compounds, the method including the steps of treating the material with an acid to cause dissolution of the cal

A method of treating solid containing material derived from effluent or sludge from a plant for deinking paper, the material containing calcium in the form of one or more insoluble calcium compounds, the method including the steps of treating the material with an acid to cause dissolution of the calcium thereby forming a calcium ion-containing solution in which insoluble solids are suspended, separating the solution from the insoluble solids and incinerating the separated solids. The solution containing calcium ions may be treated by adding one or more reagents to form a calcium compound precipitate, eg calcium carbonate. The particulate solids produced following the incineration step and following the precipitate formation may be employed as pigments or fillers in paper making or paper coating.

대표청구항 ▼

The invention claimed is: 1. A method for treating solid calcium compound-containing material derived from industrial paper plant effluent or sludge, said method comprising: (a) treating said solid calcium compound-containing material with an acid to cause dissolution of calcium and formation of so

The invention claimed is: 1. A method for treating solid calcium compound-containing material derived from industrial paper plant effluent or sludge, said method comprising: (a) treating said solid calcium compound-containing material with an acid to cause dissolution of calcium and formation of soluble calcium salts, thereby forming a calcium ion and soluble calcium salt-containing solution in which insoluble solids are suspended; (b) separating the suspended insoluble solids from the calcium ion and soluble calcium salt-containing solution in (a); and (c) incinerating the insoluble solids obtained in (b), and wherein fibrous material in said material derived from industrial paper plant effluent or sludge is not subjected to combustion or ignition prior to (a), wherein said solid calcium compound-containing material comprises at least one compound chosen from calcium carbonate, calcium silicate, and calcium phosphate. 2. A method for treating solid fiber-containing and calcium compound-containing material derived from industrial paper plant effluent or sludge, said method comprising: (a) treating said solid fiber-containing and calcium compound-containing material with an acid to cause dissolution of calcium and formation of soluble calcium salts, thereby forming a calcium ion and soluble calcium salt-containing solution in which insoluble solids are suspended; (b) separating the suspended insoluble solids from the calcium ion and soluble calcium salt-containing solution in (a); and (c) incinerating the insoluble solids obtained in (b), wherein said solid calcium compound-containing material comprises at least one compound chosen from calcium carbonate, calcium silicate, and calcium phosphate. 3. A method for treating solid calcium compound-containing material derived from industrial paper plant effluent or sludge, said method comprising: (a) treating said solid calcium compound-containing material with an acid to cause dissolution of calcium and formation of soluble calcium salts, thereby forming a calcium ion-and soluble calcium salt containing solution in which insoluble solids are suspended; (b) separating the suspended insoluble solids from the calcium ion and soluble calcium salt-containing solution in (a); and (c) incinerating the insoluble solids obtained in (b), wherein said solid calcium compound-containing material comprises at least one compound chosen from calcium carbonate, calcium silicate, and calcium phosphate. 4. A method for treating solid fiber-containing and calcium compound-containing material derived from industrial paper plant effluent or sludge, the method including treating the solid fiber-containing and calcium compound-containing material with an acid to cause dissolution of calcium and formation of soluble calcium salts, thereby forming a calcium ion and soluble calcium salt-containing solution in which insoluble solids are suspended, separating the solution from the insoluble solids, and incinerating the insoluble solids, wherein said solid calcium compound-containing material comprises at least one compound chosen from calcium carbonate, calcium silicate, and calcium phosphate. 5. The method of any one of claims 1, 2, 3, or 4, further comprising subjecting the incinerated insoluble solids to at least one additional treatment. 6. The method of claim 5 wherein said at least one additional treatment comprises comminuting the incinerated insoluble solids. 7. The method according to claim 6, wherein said comminuting comprises attrition grinding. 8. The method according to claim 6, wherein said comminuting comprises media grinding. 9. The method according to claim 6, wherein said comminuting is accomplished in dry form. 10. The method according to claim 6, wherein said comminuting is accomplished in an aqueous suspension. 11. The method according to claim 5, wherein said at least one additional treatment is chosen from particle size classification, washing, an additional heat treatment, and the addition of at least one chemical agent. 12. The method according to claim 1, wherein the solid calcium compound-containing material comprises calcium carbonate. 13. The method according to claim 2, wherein the solid calcium compound-containing material comprises calcium carbonate. 14. The method according to claim 3, wherein the solid calcium compound-containing material comprises calcium carbonate. 15. The method according to claim 4, wherein the solid calcium compound-containing material comprises calcium carbonate. 16. A method for processing solid calcium compound-containing material derived from industrial paper plant effluent or sludge, comprising: (a) subjecting said solid calcium compound-containing material to at least one heat treatment process to produce a calcined material, wherein said material derived from industrial paper plant effluent or sludge has previously undergone treatment to remove calcium, said treatment comprising treating said solid calcium compound containing material derived from industrial paper plant effluent or sludge with an acid to cause dissolution of calcium and formation of soluble calcium salts, thereby forming a calcium ion and soluble calcium salt-containing solution in which insoluble solids are suspended, wherein said solid calcium compound-containing material comprises at least one compound chosen from calcium carbonate, calcium silicate, and calcium phosphate. 17. The method of claim 16, further comprising separating the suspended insoluble solids from the calcium ion and soluble calcium salt-containing solution. 18. The method of claim 16, wherein said calcined material comprises kaolin. 19. The method according to claim 16, wherein the solid calcium compound-containing material comprises calcium carbonate. 20. A method for treating solid calcium compound-containing material derived from industrial paper plant effluent or sludge, said method comprising: (a) treating said solid calcium compound-containing material with an acid to cause dissolution of calcium and formation of soluble calcium salts, thereby forming a calcium ion and soluble calcium salt-containing solution in which insoluble solids are suspended; (b) separating said suspended insoluble solids from said calcium ion and soluble calcium salt-containing solution in (a), wherein said separated insoluble solids are capable of being subjected to at least one heat treatment process to incinerate the combustible organic compounds and calcine remaining material, wherein said solid calcium compound-containing material comprises at least one compound chosen from calcium carbonate, calcium silicate, and calcium phosphate. 21. The method according to claim 20, wherein the solid calcium compound-containing material comprises calcium carbonate. 22. A method for treating solid calcium compound-containing material derived from industrial paper plant effluent or sludge, comprising: (a) obtaining industrial paper plant effluent or sludge that has been treated with an acid to cause dissolution of calcium and formation of soluble calcium salts, thereby forming a calcium ion and soluble calcium salt-containing solution in which insoluble solids are suspended; (b) separating said suspended insoluble solids from said calcium ion and soluble calcium salt-containing solution; (c) subjecting said separated insoluble solids to at least one heat treatment process to dry the solids and incinerate combustible organic compounds; and (d) subjecting said dried insoluble solids to at least one heat treatment process to calcine remaining material, wherein said solid calcium compound-containing material comprises at least one compound chosen from calcium carbonate, calcium silicate, and calcium phosphate. 23. The method according to claim 22, wherein the solid calcium compound-containing material comprises calcium carbonate. 24. A method for treating solid calcium compound-containing material derived from industrial paper plant effluent or sludge, comprising: (a) obtaining a composition comprising kaolin and combustible organic compounds, wherein said composition has been attained by treating a solid calcium compound-containing material derived from industrial paper plant effluent or sludge to remove calcium; wherein said calcium has been removed from said solid calcium compound-containing material derived from industrial paper plant effluent or sludge with a composition comprising at least one acid to cause dissolution of calcium and formation of soluble calcium salts; and (b) subjecting said composition to at least one heat treatment process to incinerate said combustible organic compounds and calcine the remaining material, wherein said solid calcium compound-containing material comprises at least one compound chosen from calcium carbonate, calcium silicate, and calcium phosphate. 25. The method according to claim 24, wherein said at least one acid is a dilute acid. 26. The method according to claim 24, wherein said at least one acid is a mineral acid. 27. The method according to claim 26, wherein said mineral acid is hydrochloric acid. 28. The method according to claim 24, wherein said composition is subjected to at least one washing process prior to being subjected to said at least one heat treatment process. 29. The method according to claim 24, wherein said at least one heat treatment process is performed in an incineration device. 30. The method according to claim 29, wherein said incineration device is a fluidized bed furnace. 31. The method according to claim 24, wherein said at least one heat treatment process is performed at a temperature ranging from 800째 C. to 1200째 C. 32. The method according to claim 31, wherein said at least one heat treatment process is performed at a temperature ranging from 950째 C. to 1050째 C. 33. The method according to claim 24, wherein said calcined material is provided to a paper mill. 34. The method according to claim 33, wherein said calcined material is provided to a paper mill in a dry form. 35. The method according to claim 33, wherein said calcined material is provided to a paper mill in an aqueous slurry form. 36. The method of any one of claims 24, 16, or 22, further comprising subjecting the calcined material to at least one additional treatment. 37. The method of claim 36, wherein said at least one additional treatment comprises comminuting the calcined material. 38. The method according to claim 37, wherein said comminuting comprises attrition grinding. 39. The method according to claim 37, wherein said comminuting comprises media grinding. 40. The method according to claim 37, wherein said comminuting is accomplished in dry form. 41. The method according to claim 37, wherein said comminuting is accomplished in an aqueous suspension. 42. The method according to claim 36, wherein said at least one additional treatment is chosen from particle size classification, washing, an additional heat treatment, and the addition of at least one chemical agent. 43. The method according to claim 42, wherein said at least one chemical agent is chosen from optical brightening agents and coagulants. 44. The method according to claim 42, wherein the at least one additional treatment comprises an additional heat treatment, and wherein the additional heat treatment dries the solids and incinerates combustible organic compounds. 45. The method according to claim 24, wherein the solid calcium compound-containing material comprises calcium carbonate.