High solids lime as a caustic replacement

Details High solids lime as a caustic replacement High solids lime as a caustic replacement

C - Chemistry, Metallurgy

02

F

C02F 1/66 (2006.01)

Patent

CA 2229020

A composition for a pumpable lime slurry which is adapted for use as a replacement for caustic solutions is formed by combining a dispersing agent in lime and water to form an aqueous slurry. The amount of lime used is between 35 to 55 % by weight of the slurry. The dispersing agent, which is an anionic polyelectrolyte, such as polyacrylic, polycarboxylic acids and alkali metal salts thereof, is added in an amount between 0.1 to 3 % by weight of the lime. To this is added an alkali metal hydroxide of 0.1 to 1.5 % by weight of lime. The order of addition of the alkali metal hydroxide is important. The later addition of the alkali metal hydroxide results in a decreased viscosity so that a lower amount of dispersing agent is required.

L'invention concerne une pâte épaisse de chaux qui peut être pompée, utilisable à la place de solutions caustiques. La pâte épaisse s'obtient en combinant un agent dispersant avec de la chaux et de l'eau pour former une pâte épaisse aqueuse. La chaux représente entre 35 et 55 % en poids de la pâte. L'agent dispersant est un polyélectrolyte anionique, tel que des acides polyacryliques ou polycarboxyliques ou leur sel de métal alcalin, utilisé à raison de 0,1 - 3 % en poids de la chaux. A cette préparation, on ajoute un hydroxyde de métal alcalin, à raison de 0,1 - 1,5 % en poids de la chaux. L'ordre d'addition de l'hydroxyde de métal alcalin est important. L'addition de l'hydroxyde de métal alcalin provoque une diminution de la viscosité, ce qui permet d'utiliser moins d'agent dispersant.

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