Lime-based compositions, method for making them and their use in treating water and sludge
AssigneesS.A. Lhoist Recherche et Developpement, Snf S.A.S.
InventorsLaurent Biotteau, Gaetan Blandin
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Abstract
A composition based on lime comprising at least one mineral agent consisting of slaked lime in the solid phase and of an organic polymer incorporated into said solid phase, a method for its making and the use for its application in the treatment of water and sludge, in particular for conditioning sludge before dewatering.
Claims22
A composition comprising at least a mineral agent and at least one organic polymer, characterized in that said composition is a lime based composition, wherein said mineral agent comprises at least a solid phase of slaked lime and in that said at least one organic polymer is incorporated into said solid phase of the slaked lime, and wherein the composition comprises between 2 grams and 100 grams of said at least one organic polymer for 1 kilogram of lime expressed as slaked lime, Ca(OH)2, equivalents.
A composition comprising at least a mineral agent and at least one organic polymer, characterized in that said composition is a lime based composition, wherein said mineral agent comprises at least a solid phase of slaked lime and in that said at least one organic polymer is incorporated into said solid phase of the slaked lime;
- wherein said mineral agent further comprises quick lime;
- wherein the slaked lime is present in an amount ranging from 0.5 to 99.8% by weight based on the weight of the composition;
- wherein said organic polymer is present in am amount from 0.2 to 10% by weight based on the weight of the composition;
- wherein said quick lime is present in an amount ranging from 0.1% to 99.3% by weight based on the weight of the composition;
- wherein said organic polymer is a linear, branched or cross-linked hydrophilic polymer of a non-ionic, anionic, cationic or amphoteric nature;
- wherein said polymer consists of a resin of polyamine based on epichlorohydrin, of dicyanodiamide, of melamine formaldehyde, or of polyalkyleneimine;
- wherein said organic polymer is a non-ionic, anionic, cationic, or amphoteric flocculent having an average molecular weight comprised between 5×106 g/mol and 40×106 g/mol.
A composition comprising at least a mineral agent and at least one organic polymer, characterized in that said composition is a lime based composition, wherein said mineral agent comprises at least a solid phase of slaked lime and in that said at least one organic polymer is incorporated into said solid phase of the slaked lime;
- wherein said mineral agent further comprises quick lime;
- wherein the slaked lime is present in an amount ranging from 0.5 to 99.8% by weight based on the weight of the composition;
- wherein said organic polymer is present in an amount from 0.2 to 10% by weight based on the weight of the composition;
- wherein said quick lime is present in an amount ranging from 0.1% to 99.3% by weight based on the weight of the composition;
- wherein said organic polymer is selected from the group consisting of organic polymers and of organic copolymers and comprises one or more monomers selected from the group consisting of anionic monomers having a carboxylic or sulfonic function and cationic monomers;
- wherein said organic polymer has associated therewith one or more hydrophobic monomers selected from the group consisting of esters of (methyl)acrylic acid, with an alkyl, arylalkyl and/or ethoxylated chain, derivatives of (meth)acrylamide with an alkyl, arylalkyl or dialkyl chain, cationic allylic derivatives, anionic or cationic hydrophobic (meth)acryloyl derivatives, or in association with one or more anionic and/or cationic monomers derived from (meth)acrylamide bearing a hydrophobic chain.
Dependencies are inferred from the claim text.