Put an appropriate amount of mercury into a reaction tank, add nitric acid (specific gravity 1.4) with the weight ratio of 1 .3 ~/kloc-0, and let it react naturally. When there is no mercury, add water with the weight ratio of1,and gradually add/kloc while stirring.
The black mercuric sulfide is repeatedly washed for 3-4 times by dumping method, filtered by a cloth bag, the filtrate is dried, 4% of sublimated sulfur is added, after being evenly mixed, it is heated and sublimated to obtain purple-red massive mercuric sulfide, and then the massive mercuric sulfide is ground into powder to obtain pure cinnabar.
Cinnabar, also known as Cinnabar, Red Cinnabar, Red Cinnabar and Mercury Sand, is a natural ore of mercury sulfide (chemical name: HgS). Bright red, with diamond luster to metallic luster, belonging to ternary crystal system. The main component of cinnabar is mercury sulfide, but it is often mixed with realgar, apatite and asphaltene.
Extended information: Cinnabar, also known as Cinnabar and Cinnabar, is red in powder and can last for a long time. China has a long history of using cinnabar as a pigment. "Painting cinnabar Oracle Bone Inscriptions" refers to grinding cinnabar into red powder and embedding it in the notch of Oracle Bone Inscriptions to show eye-catching. This practice has a history of thousands of years.
Roses and bright colors are also loved by painters. China's paintings and calligraphy are called "Danqing", in which "Dan" refers to cinnabar, which is an indispensable "eight treasures inkpad" in painting and calligraphy pigments, and its main component is also cinnabar. China is also one of the countries that produce the most cinnabar in the world, and the market price of cinnabar has been rising all the way in recent years.
Reference: Baidu Encyclopedia-Cinnabar