Method for producing nano calcium sulfate by using sodium sulfate waste liquid generated in production process of viscose fibers
A technology of nano calcium sulfate and sodium sulfate waste liquid, applied in the direction of calcium/strontium/barium sulfate, etc., can solve the problems of incomplete reaction, poor product quality, uneven mixing of raw materials, etc., to avoid re-agglomeration, reduce impurities, Precise effect of feeding
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Embodiment 1
[0054] A kind of method that utilizes the sodium sulfate waste liquid in viscose fiber production to produce nano-calcium sulfate, sodium sulfate waste liquid and calcium chloride solution are pretreated to obtain pretreated sodium sulfate solution and pretreated calcium chloride solution; pretreated sulfuric acid The sodium solution and the pretreated calcium chloride solution are fed into the microchannel reactor for reaction; the microchannel reactor includes an upper feed layer 1, a lower feed layer 2 and a middle reaction layer 3; the upper feed layer 1 and the lower layer Feeding holes 4 are all arranged on the feeding layer 2; the middle layer reaction layer 3 is a network branch structure, and the calcium chloride feeding channel 5 communicates with the sodium sulfate feeding channel 6 to form a feeding unit. The feeding unit is arranged oppositely, and communicates through the primary channel 7 at the same time, and the feeding unit and the primary channel 7 form a pri...
Embodiment 2
[0057] On the basis of embodiment 1:
[0058] Preferably, the pretreatment is specifically as follows: the sodium sulfate waste liquid and the calcium chloride solution in viscose fiber production are respectively passed through flocculation and sedimentation, and the supernatants of the two raw materials are subjected to coarse filtration respectively, and finally membrane filtration is used Fine filtration, obtain pretreatment sodium sulfate solution and pretreatment calcium chloride solution;
[0059] Further, the flocculation and sedimentation specifically include: injecting the sodium sulfate waste liquid and the calcium chloride solution into the sedimentation tank through the pump respectively, according to 1m 3 Add 10g of flocculant polyvinylamide to sodium sulfate waste liquid or calcium chloride solution, and settle for 12 hours.
[0060] Furthermore, the SS values of the supernatants of the two raw materials after flocculation and sedimentation are both 100 mg / L....
Embodiment 3
[0065] On the basis of embodiment 1:
[0066] Preferably, the pretreatment is specifically as follows: the sodium sulfate waste liquid and the calcium chloride solution in viscose fiber production are respectively passed through flocculation and sedimentation, and the supernatants of the two raw materials are subjected to coarse filtration respectively, and finally membrane filtration is used Fine filtration, obtain pretreatment sodium sulfate solution and pretreatment calcium chloride solution;
[0067] Further, the flocculation and sedimentation specifically include: injecting the sodium sulfate waste liquid and the calcium chloride solution into the sedimentation tank through the pump respectively, according to 1m 3 Add 20g of flocculant polyvinylamide to sodium sulfate waste liquid or calcium chloride solution, and settle for 36 hours.
[0068] Furthermore, the SS values of the supernatants of the two raw materials after flocculation and sedimentation are both 500 mg / L....
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