General industrial requirements for arsenic ore [1] Mainly used for making Elemental arsenic 、 Arsenite and Arsenic compound , used as Insecticide and herbicide 。 realgar 、 Orpiment needing to be done traditional Chinese medicine 。 Also used for metallurgy 、 military And light industry departments. Arsenic acid and arsenate are toxic. [1] The content in the crust is about 2-5mg/kg, which is the 20th place of crustal elements. Trace arsenic can be detected in soil, water, minerals and plants. It also contains trace arsenic in normal human tissues.
Arsenic exists in the crust in different forms: orpiment, realgar, etc. It exists in arsenopyrite.
Arsenic is found everywhere in nature: volcanic eruptions and arsenic bearing ores.
Chinese alchemists call sulfur, realgar and orpiment three yellow, and regard them as important medicines. In the first half of the 4th century AD, Chinese alchemist and ancient pharmacologist Ge Hong (283-363 years) wrote in the "Immortal Medicine", Volume XI of Baopuzi Internal Part, that "realgar...... Bait can be eaten by steaming, or wine bait, or nitration can be used as water, which is coagulated, or black intestines can be steamed under the red earth, or pine resin can be used, or three substances can be used to refine it, which is as white as ice and cloth. This is Ge Hong's way of taking realgar: either steaming it, soaking it in wine, or dissolving it in potassium nitrate (saltpeter) solution. Dissolve it with potassium nitrate to form potassium arsenate K three AsO four , will decompose and generate when heated arsenic trioxide As two O three , arsenic. Or it can be co heated with lard (pig intestines); Or mixed with pine resin (rosin) for heating. Lard and pine resin are carbon containing organic compounds, which will be carbonized to form carbon when heated. Carbon will make arsenic transformed from realgar generate simple arsenic: 2As two S two + 7O two → 2As two O three + 4SO two
2As two O three + 3C → 4As + 3CO two ↑
Or the mixture of arsenic trioxide and arsenic can be obtained by heating the realgar with nitrate, lard and pine resin ("or refining it with three substances"). [Of course, because one of the main components of realgar is sulfur, this operation has a high probability of explosion]
