Low brightness magnesium silicate SLR filler low brightness paper containing the filler and methods to produce the filler and use it in low brightness papers
作者： Leif B. Martensson , Kaarina Heikkila
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摘要: A method for producing a low-structure magnesium silicate SLR product useful to lower the strike through of low brightness paper products comprises adding raw mineral source soluble ions and sulfuric acid in proportion under conditions effective form slurry comprising sulfate silica leach residue (SLR), solution an alkali metal molar equivalent MgO:SiO 2 1:2.0-4.0 precipitate having SiO :MgO:SLR 50-75%:5-12%:10-50% by weight product. filler 50 75 wt % , 5 12 MgO, 10 SLR, 0 6 Fe O 3 7 Al wherein is 1:2.0-4.0. at least amount invention. reducing 0.001 8 described above low-brightness, low-strike
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