Manganese, 66-67 carbonate

Realgar, see di-Arsenic disulfide Red lead, see Lead(II,IV) oxide Rhodochrosite, see Manganese carbonate... 

Synthetic manganese carbonate is made from a water-soluble Mn (IT) salt, usually the sulfate, by precipitation with an alkafl or ammonium carbonate. The desired degree of product purity determines the quaUty of manganese sulfate and the form of carbonate to be used. For electronic-grade material, where the content of K O and Na20 cannot exceed 0.1% each, the MnSO is specially prepared from manganese metal, and ammonium bicarbonate is used (26) (see Electronic materials). After precipitation, the MnCO is filtered, washed free of excess carbonate, and then, to avoid undesirable oxidation by O2, dried carefljlly at a maximum temperature of 120°C. 

Many types of stainless steels are available. The type most widely used in the dairy industry is 18—8 (18% chromium, 8% nickel plus iron). Small amounts of siHcon, molybdenum, manganese, carbon, sulfur, and phosphoms maybe included to obtain characteristics desired for specific appHcations. 

In the nickel—carbon and cobalt—carbon systems, the nickel carbide (3 1) [12012-02-1], Ni C, and cobalt carbide (3 1) [12011-59-5] C03C, are isomorphous with Fe C and exist only at low temperatures. The manganese—carbon system contains manganese carbide (3 1) [12121 -90-3] Mn C, isomorphous with Fe C, and manganese carbide (23 6) [12266-65-8] isomorphous with chromium carbide (23 6) [12105-81 -6] These... 

Manganese. Manganese ore, rhodochrosite, or manganese carbonate (MnCOg) is calcined at about 1525 K to produce the oxide (Mn,304). When the oxide ore is available but is in a finely divided state, the rotaiy kiln is used only for nodulizing. 

There are two major types of household batteries (a) Primary batteries are those that cannot be reused. They include alkaline/manganese, carbon-zinc, mercuric oxide, zinc-air, silver oxide, and other types of button batteries, (b) Secondary batteries are those that can be reused secondary batteries (rechargeable) include lead-acid, nickel-cadmium, and potentially nickel-hydrogen. 

Synthetic lubricating oils, higher olefin polymers in, 20 432 Synthetic macrocyclic compounds chelating agents, 5 713t Synthetic manganese carbonate, 15 573 Synthetic manganese dioxides, 15 586-588 Synthetic marble, 16 283... 

Manganese carbonate (MnCO ) is used in the production of iron ore and as a chemical reagent. 

On calcination at 700PC in air, the manganese carbonate particles are converted to Mn203 (bixbyite) and in nitrogen to MnO (manganosite) (27). 

Under appropriate conditions, manganese carbonate cubes dispersed in NiS04 solutions containing urea were covered with a layer identified as NiCOr Ni(0H)2 H20 (Fig. 7.1.8A) (27), which on calcination transformed into Mn203 cores... 

LET MANGANESE CARBONATE SETTLE. POUR LIQUID OFF PRECIPITATE. ADD HYDROCHLORIC ACID BY THE DROP UNTIL DISSOLVED. RESULT IS MANGANESE CHLORIDE [MnClj). 

Manganese Carbonate(also called Dialozite or Rhodochrosite), MnCOa mw 114.9, rose- colored rhmb crysts, mp dec on heating, d 3 13 (Ref 5,p 512). (See also Spec MIL- M- 13667)... 

T. Curtius and J. Rissom showed that the evaporation of a soln. of manganese carbonate in hydrazoic acid gives a pulverulent, non-crystalline manganese hydroxyazide, Mn(OH)(N3)2, which cannot be purified by re-crystallization. The product is sparingly soluble in water it does not explode by percussion, but does so on a hot plate. L. Wohler and F. Martin gave 203° for the explosion temp, of manganese azide. T. Curtius and J. Rissom obtained a colourless soln. of ferrous azide by the action of sodium azide on a soln. of ferrous ammonium sulphate when boiled, the salt decomposes and when shaken in air, a blood-red soln. of ferric azide is formed. The same salt can also be obtained directly from ferric salts. When the soln. of ferric azide is boiled, ferric hydroxide is precipitated and, added T. Curtius and A. Darapsky, if allowed to stand in... 

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