Evaporative treatment method for aqueous solution
AssigneeSasakura Engineering Co., Ltd.
InventorsJunji Mizutani, Yo Fujimoto, Tatsuya Taguchi, Yoshiyuki Hatano
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Abstract
The present invention provides an aqueous solution evaporative treatment method that makes it possible to efficiently perform evaporative treatment of an aqueous solution containing calcium, magnesium, and silica. The aqueous solution evaporative treatment method comprises a seed crystal mixing step of adding to and mixing with an aqueous solution containing calcium, magnesium, and silica at least any one of magnesium salt and silicate together with calcium salt as seed crystals, and an evaporative concentration step of evaporatively concentrating the aqueous solution together with the seed crystals.
Claims9
A method of treating an aqueous solution, comprising:
- adding seed crystals comprising a calcium salt and at least one of a magnesium salt or silicate to an aqueous solution comprising calcium, magnesium, and silica;
- mixing the seed crystals with the aqueous solution comprising calcium, magnesium, and silica;
- supplying the aqueous solution comprising calcium, magnesium, and silica that has been mixed with the seed crystals to an evaporative concentration device comprising a heat exchanger having a plurality of heat exchanger tubes, wherein the plurality of heat exchanger tubes are horizontally positioned;
- and
- evaporatively concentrating the aqueous solution comprising calcium, magnesium and silica together with the seed crystals to form a concentrated liquid,
- wherein the aqueous solution before the seed crystals are added has a silica concentration of between 20 ppm and 125 ppm, and
- wherein the step of evaporatively concentrating the aqueous solution is performed until the silica concentration of the aqueous solution reaches 200 to 500 ppm.
Dependencies are inferred from the claim text.