| 摘要 |
PROBLEM TO BE SOLVED: To provide a flocculating agent which is manufactured using an iron containing raw material, a silica-containing raw material and mineral acid and has the best flocculating performance and best preservation stability by adjusting the concentration of the mineral acid corresponding to the ratio of an iron concentration and a silica concentration in the flocculating agent when the ratio is fixed. SOLUTION: In the flocculating agent, the mineral acid concentration [%] in the flocculating agent is within the range of "the mineral acid concentration = 4×[the silica concentration%]/[the iron concentration%]×(0.4±0.1)[%]" with the ratio A (the silica concentration%/the iron concentration%) of the iron concentration% and the silica concentration% in the flocculating agent as a reference, and especially the mineral acid concentration [%] is about 0.4 time or 0.5 time of a numerical value [4×A]. COPYRIGHT: (C)2008,JPO&INPIT
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