Deinking a cellulosic substrate using magnesium hydroxide
A composition and method for deinking is disclosed. The composition and method contain an activated magnesium hydroxide or a magnesium hydroxide.
1. A method of removing ink from a cellulosic containing substance comprising:
(a) blending a composition comprising: (1) magnesium hydroxide, (2) a suspending agent for said magnesium hydroxide, (3) an emulsifier, (4) water, and (5) tall oil fatty acid;
wherein the composition contains from about 5% to about 70% by weight magnesium hydroxide;
(b) adding the composition to the cellulosic containing substance;
(c) optionally excluding the addition of caustic soda to the cellulosic containing substance; and
(d) optionally excluding the addition of hydrogen peroxide to the cellulosic containing substance.
2. The method of claim 1 , wherein said cellulosic containing substance is located anywhere in a recycling process up through at least one flotation accept.
3. The method of claim 1 , wherein the composition is added to a paper recycling process in at least one of the following locations: a pulper; dilution stage; flotation cell thickening stage; and a kneader.