chemical purification

基本解释

Nuclear pure natural flake graphite has been obtained by chemical purification process.
用化學提純工藝制出了核純天然石墨粉；
Answer: want first choice, remaking sand, through the magnetic separation, flotation or chemical purification, silica be 95 percent.
答：先要精選，再制砂後，經磁選、浮選或化學提純後，二氧化矽能達到95%。
The investment and purification cost of chemical purification method is considered lower in producing feed grade, industrial grade, food grade phosphate by using WPA;
認爲，用溼法磷酸制飼料級、工業級和食品級磷酸鹽産品，採用新化學淨化溼法磷酸投資少，淨化成本低；