the largest Sodium Nitrite manufactory in China close

In the end of October ,the largest factory which produce Sodium Nitrite and Sodium Nitrate  in China was close.It would cut about 20% output of China every year.Meanwhile ,it is a peak period in winter in North of China because it used in the achitective .So the price incresed from 2750 Yuan to 3800 Yuan since October.At present,the price is slight falling down.