Cobalt arsenate

Tin hold the record with 10 stable isotopes. There are 19 so-called "pure elements" of which there is only one isotope. These anisotopic elements are beryllium, fluorine, sodium, aluminum, phosphorus, scandium, manganese, cobalt, arsenic, yttrium, niobium, rhodium, iodine, cesium, praseodymium, terbium, holmium, thulium, gold, and bismuth. 

Selenium is one of the better decolorizers in tank melting. The iron is neutralized by the pink tint of the selenium. Since a yellow shade is still present, the decolorizing is completed with the addition of a small amount of cobalt. Arsenic helps to stabilize the decolorizing with selenium but as the arsenic content increases more selenium is required. 

Many chemists in Sweden and in other parts of the world immediately accepted Cronstedt s claim to the discovery of a new element, but B.-G. Sage (22) and A.-G. Monnet in France believed that his nickel was merely a mixture of cobalt, arsenic, iron, and copper (7). As a matter of fact, it was somewhat contaminated with iron, cobalt, and arsenic, and there-... 

Some Famous Nickel Mines and Smelters. The nickel smelting works near Schneeberg in the Saxon Erzgebiige date from 1642. They produced nickel, cobalt, arsenic, and bismuth from the local ores, and refined the nickel-cobalt regulus imported from the Modum works in southern Norway (129). 

Erythrite. A natural hydrated cobalt arsenate which is found in USA.and in Canada. Not to be confused with Erythritol which is also called Erythrite... 

Colloidal cobalt arsenate has been obtained in the form of an opalescent jelly either by mixing in the cold a solution of a cobalt salt of a strong acid with potassium dihydrogen orthoarsenate,8 or by successively treating an aqueous solution of a cobaltous salt with ammonium sulphate, acetic acid and an excess of sodium orthoarsenate.9... 

Colloidal manganese arsenate may be obtained in an analogous way to that described for cadmium and cobalt arsenates.7 If concentrated solutions of manganous chloride and potassium dihydrogen arsenate are mixed at the ordinary temperature, a solid jelly is formed, which remains stable for weeks but finally, rose-coloured crystals separate and the jelly partly liquefies.8 The essential constituent of the jelly appears to be the monohydrogen arsenate, MnHAs04, and the crystals are the monohydrate, MnHAs04.Ha0. 

Tri-cobalt Di-arsenide, Co3As2, may be prepared by the action of arsenic chloride on metallic cobalt at 800-1400° C. or by heating mixtures of arsenic and cobalt in hydrogen or carbon monoxide at this temperature. It is also formed when powdered cobalt is heated in hydrogen containing arsenic vapour, and when cobalt arsenate or arsenite is reduced by hydrogen at 900° C. Its density is 7-82, and it loses arsenic when strongly heated.1... 

Cobalt Arsenates.—The ortho-arsenate, Co3(As04)2.8IT20, occurs in nature as erythrite or cobalt bloom in the form of monoclinic crystals isomorphous with vivianite, Fes(P04)2.8lI20, and perhaps with nickel ochre, Ni3(As04)z.8H20. Its crystallographic elements are ... 

AS2CO3O8 (s) 3CoO AS2O5 (s) Cobalt Arsenate AsaCogOg (s) 3CoO AS2O5 (s)... 

Arsenic is a metallic element (symbol As atomic no. 33), which exists in several allotropic forms. Various ores contain crystalline forms of arsenic salts cobaltite contains cobalt arsenic sulfide mispickel (arsenopyrite) iron arsenic sulfide orpiment arsenic trisulfide proustite (ruby silver ore) silver arsenic sulfide realgar arsenic sulfide and tennantite copper arsenic sulfide. 

A geological survey of India recently discovered three major deposits at Nallakonda, the lead-copper belt in Andhra Pradesh. The total reserves of all three are about 60.7 million tons. The interesting part of the investigation was that the samples indicated the presence of significant amounts of silver, cobalt, arsenic, and nickel, recovery of which was considered economically possible. 

Derivation By heating alumina with (1) cobaltous oxide, or a material yielding this oxide on calcination (2) cobalt phosphate (3) cobalt arsenate. Greenish shades may be made by incorporating zinc oxide. 

Cobalt bloom. Co3(As)4)2 8H20. A natural hydrated cobalt arsenate. 

Cobalt is extracted from an ore called cobaltite, which is a compound of cobalt, arsenic, and sulfur. This element is often used in compounds and alloys that are added to steel to increase its strength. In addition, cobalt is often mixed with tungsten and copper to form an alloy known as stellite, which is a popular product because it retains its durability and hardness even at high temperatures. 

The alkaline earth group as a whole stands in marked contrast to transition metals and post-transition metals. For example, most of the metals in the periodic table form insoluble precipitates with the sulfide ion (S2), with the result that sulfide ores of transition and post-transition metals are very common in Earths crust. Common examples of metal sulfides include galena (lead sulfide), cinnabar (mercury sulfide), gree-nockite (cadmium sulfide), acanthite (silver sulfide), cobaltite (cobalt arsenic sulfide), sphalerite (ZnS), stibnite (antimony sulfide), several copper sulfides, orpiment and realgar (both forms of arsenic sulfide), and pyrite (iron sulfide). None of the alkaline earths, however, are found as sulfides. 

At first chemists were disinclined to accept the view that nickel was a new element. Cronstedt s specimen was impure and many believed that it was merely a more or less unholy mixture of cobalt, arsenic, iron, and possibly copper. But in 1775 Torbern Bergman, Cronstedt s famous Swedish contemporary, confirmed the existence of nickel, of which he prepared a fairly pure sample, and showed that no alloy of copper, iron, cobalt, and arsenic would behave like it. 

Co3(As04)2 COBALT ARSENATE 533 Cr2N DICHROMIUM NITRIDE 567... 

Cobalt arsenic sulfide CoAsS 12264-82-9 166.920 silv-wh solid -6.1 ... 

Lecture 1, Introduction 2-4, Fire 5, Fire and Air 6-7, Air 8, Water 9-10, Mineral Waters 11, Earth 12, Salts, acid salts in particular 13-15, Salts neutral salts 16, sulphur 17, Oils and Vegetable Matters 18, On the analysis of Animals and Vegetables 19, Temperature 20, Animal Juices 21, Metals gold ( lead, platinum), silver 22, metals copper, tin 23, Metals antimony 24, Metals bismuth, zinc, cobalt, arsenic 25, Colours, prisms 26, On fermentation 27, Artificial gums 28, On Docinay and some mercurials 29, Poisons 30, Phosphors 31, [Incomplete]... 

Synonyms erythritol cobalt bloom cobalt arsenate... 

The average trace-element concentrations of seven xtl MMs from the Cap Prudhomme collection are listed in Table 18.14 based on data published by Kurat et al. (1994). The enrichment or depletion of trace elements in the MMs relative to average rocks of the continental crust (Taylor and McLennan 1985) was expressed as the logarithm to the base 10 of the MM crustal-rock ratios. The resulting distribution of data points in Fig. 18.31 indicates that the MMs are strongly enriched in iridium and gold as well as in nickel, chromium, selenium, iron, cobalt, arsenic, and antimony relative to crustal rocks. 

Cobalt arsenate. See Cobalt arsenate (ous) Cobalt arsenate (ous)... 

Cobaltous arsenate. See Cobalt arsenate (ous) Cobaltous bromide. See Cobalt bromide (ous), Cobaltous carbonate. See Cobalt carbonate (ous)... 

Cobalt ammonium phosphate (ous) Cobalt arsenate (ous) Cobalt oxide (ous) Cobalt phosphate (ous) Cobalt potassium nitrite Ferrous oxide Nickel oxide (ous) Selenium Tellurium... 

Cobalt chloride (ous) Nickel oxide (ous) porcelain painting, light blue colors Cobalt arsenate (ous) porcelain, decorating Sodium selenite porcelains Zinc carbonate... 

Bunsenite [1313-99-1] [Named after the German chemist and spectroscopist Robert Wilhelm Bunsen(1811-1899)] (ICSD 9866 and PDF 4-835) NiO M = 74.6928 78.58 wt.%Ni 21.42 wt.% 0 (Oxides and hydroxides) Coordinence Ni(6) Cubic a = 417.69 pm Bl,cF8 (Z=4) S.G. Fm3m P.G. 432 Rock salt type Periclase group Isotropic = 2.37 5.5 6898 (6806) Habit octahedral crystals. Color dark pistachio green. Luster vitreous. Diaphaneity transparent. Streak brownie black Clivage unknown. Fracture unevea Chemical soluble with difficulty in strong mineral acids. Occurrence found in the oxidized zone of hydrothermal nickel-uranium veins along with nickel and cobalt arsenates. 

Brandt classed mercury, antimony, bismuth, cobalt, arsenic and zinc as semi-metals, rejecting cinnabar, vitriols, etc., from this class. He considered that true metals solidify from fusion with a convex surface. The semi-metals have a metallic appearance but are brittle under the hammer. He describes metallic zinc spiauter, conterfeth) from the East Indies, Rammelsberg, and Dalecarlia and Rattwick in Sweden, as a semi-metal. Blende is an ore of zinc and white vitriol is a compound of zinc, since it can be prepared by dissolving zinc in sulphuric acid, and if the solution of white vitriol is precipitated with alkali and the precipitate (zinc carbonate) heated with copper and charcoal, brass is produced. 

A cobalt-arsenic ore is known in the Cobalt Belt in Idaho, USA, but the mine in Blackbird was closed in 1959. Plans for new mining and cobalt production in Idaho have been reported. 

Metals can be found at levels ranging from 1 to 1200 ppm, the main being iron, zinc, copper, lead, molybdenum, cobalt, arsenic, manganese, chromium, sodium, nickel and vanadium, the latter two with the highest incidence. 

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