CAJ | 학술논문

研究了包头稀土精矿浓硫酸高温焙砂水浸液经过镁皂化萃取转型产生的镁皂废水的资源化全循环工艺，针对镁皂废水的净化除杂、晶体制备、晶体煅烧等进行了可行性研究。结果表明：控制草酸用量为理论量的2倍，镁皂废水的氧化钙质量浓度＜0．2g／L ；净化后的镁皂废水经陶瓷膜过滤、纳滤膜浓缩得到的透析水可回用于水浸，浓水进入蒸发系统回收硫酸镁和冷凝水；冷凝水回用于水浸，硫酸镁晶体与碳粉在850℃下煅烧8 h可制备氧化镁；所得氧化镁的 CAA 活性值为109 s ，MgO 质量分数为96．84％，CaO 质量分数为0．52％，可用于生产稀土；硫酸镁煅烧产生的二氧化硫在钒触媒催化作用下可转化成70％的硫酸，回用于焙烧。该工艺可实现镁皂废水资源化全循环利用。
연구료포두희토정광농류산고온배사수침액경과미조화췌취전형산생적미조폐수적자원화전순배공예，침대미조폐수적정화제잡、정체제비、정체단소등진행료가행성연구。결과표명：공제초산용량위이론량적2배，미조폐수적양화개질량농도＜0．2g／L ；정화후적미조폐수경도자막과려、납려막농축득도적투석수가회용우수침，농수진입증발계통회수류산미화냉응수；냉응수회용우수침，류산미정체여탄분재850℃하단소8 h가제비양화미；소득양화미적 CAA 활성치위109 s ，MgO 질량분수위96．84％，CaO 질량분수위0．52％，가용우생산희토；류산미단소산생적이양화류재범촉매최화작용하가전화성70％적류산，회용우배소。해공예가실현미조폐수자원화전순배이용。
The resource recovery of magnesium saponification wastewater of leaching solution of sulfuric acid calcining rare earth concentrate was studied mainly involving the progresses of purification ,crystallization ,calcination and so on .T he experiment results show w hen the actual amount of oxalic acid is twice the theoretical amount ,the content of CaO in the magnesium saponification wastewater can be reduced to less than 2% .Then the dialysis water by ceramic membrane and nanofiltration membrane can be used in the process of RE leaching ,and the concentrate water can be used to recover magnesium sulfate and condensate water in evaporation system .The condensate water can used in the process of RE leaching .The magnesium sulfate crystal with carbon powder is calcinated for 8 h at 850 ℃ ,the magnesium oxide can be obtained .The analysis results show that in the magnesium oxide ,the content of MgO and CaO is 96 .84% and 0 .52% ,respectively .The value of CAA for the magnesium oxide is 109 s .Sulfur dioxide produced in the process of calcination can be conversed into 70% sulfuric acid used in the process of sulfuric acid calcinating RE concentrate .