Mercury , Cinnabar

Protosulphide of Mercury.—Cinnabar, Vermlion.— This is a much more important compound, though, like the former, medicinally inert. The character and composition of the native ore have been already explained. Only a small quantity of that mineral, however,is of suffi-cicntly fine quality to permit of its being employed as a pigment. Chemically, there ia nq difficulty in forming it ... 

Elemental Mercury Reactive Mercury Particulate Mercury Cinnabar... 

Biro L, Klein WP. 1967. Unusual complications of mercurial (cinnabar) tattoo Generalized eczematous eruption following laceration of a tattoo. Arch Dermatol 96(2) 165-167. 

Mercuric sulphide 26B1 HgS Bisulphide of mercury cinnabar protosulphide of mercury red mercuric sulohide red sulphide of mercury sulphide of mercury vermlllion. 

Mercuric Sulfid—ifed sulfld of mercury—Cinnabar— Vermilion —Hydrargyri sulfidum rubrum (XT. S.)—HgS—231.7—exists in nature in amorphous red masses, or in red crystals, and is the chief ore of Hg. If Hg and S be ground up together in the cold, or if a solution of a mercuric salt be completely decomposed by HsS, a black sulfld is obtained, which is the iEthiops mineralis of the older pharmacists. 

Cinnabar is a mineral that is mined in order to produce mercury. Cinnabar is mercury(II) sulfide, HgS. What mass of mercury can be obtained from 50.0 kg of cinnabar ... 

Other recovery methods have been used (10). These include leaching ores and concentrates using sodium sulfide [1313-82-2] and sodium hydroxide [1310-73-2] and subsequentiy precipitating with aluminum [7429-90-3], or by electrolysis (11). In another process, the mercury in the ore is dissolved by a sodium hypochlorite [7681-52-9] solution, the mercury-laden solution is then passed through activated carbon [7440-44-0] to absorb the mercury, and the activated carbon heated to produce mercury metal. Mercury can be extracted from cinnabar by electrooxidation (12,13). 

Ore. The assay of mercury ores is not simple, owing to the difficulties encountered in obtaining representative ore samples. Crystalline cinnabar is extremely brittie causing it to break loose from adjacent rock and fall into the sample being collected. This uncontrollable salting of the sample can give results as much as several hundred percent over the actual mercury content of the sample. 

The toxic effects of mercury and mercury compounds as well as their medicinal properties have been known for many centuries. In the first century AD, Pliny indicated the use of mercuric sulfide (cinnabar or vermilion) in medicine and in cosmetics. This compound was probably known to the Greeks in the time of Aristotle (13). 

Mercury. In recovering mercuiy from cinnabar ores, the ore is crushed to minus 1.5 cm and fed to rotary Idlns, where it is calcined to over 800 K. Since the mercuiy exists as mercuric siilfide (HgS), the sulfur is oxidized to SO9 and the mercuiy vaporized. The gases are passed through cooling chambers, where the mercuiy condenses and is collected. Mercuiy vaporizes at 625 K. 

Mercury from cinnabar ore 225 tons ore/day (95% recovery) (2) 18,0 ft. diam, 8 hearth furnaces Furnaces fired on hearths 3 to 7, inclusive retention time of 1,0 hr, furnaces are oil-fired with low-pressure atomizing air burners all air, both primary and secondary, introduced through the burners draft control by Monel cold-gas fans downstream from mercury condensers. 

The isolation of mercury is comparatively straightforward. The most primitive method consisted simply of heating cinnabar in a fire of brushwood. The latter acted as fuel and condenser, and metallic mercury collected in the ashes. Modem techniques are of course less crude than this but the basic principle is much the same. After being crushed and concentrated by... 

Merkur, m. mercury, -blende, /. Min.) cinnabar. -chlorid, n. mercury chloride, specif, mercuric chloride, mercury(II) chloride, -chloriir, n. mercurous chloride, mercury(I) chloride, -gelb, n. mercury yellow, turpeth mineral. 

Cinnabar and mercury, (a) The mineral cinnabar, from which mercury is obtained, (b) Mercury, an element... 

---