Thallium - Wikipedia

Thallium is a chemical element with the symbol Tl and atomic number 81. It is a gray post-transition metal that is not found free in nature. When isolated, thallium resembles tin, but discolors when exposed to air.Chemists William Crookes and Claude-Auguste Lamy discovered thallium independently in 1861, in residues of sulfuric acid production. Both used the newly developed method of flame ...

Thallium - Element information, properties and uses ...

In particular, the conductivity of thallium sulphide alters on exposure to infrared light, making it an important compound in photocells. Thallium bromide-iodide crystals have also been used in infrared detectors. The addition of metals like thallium to glass can also reduce its melting point to as low as 150 degrees centigrade.

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The invention concerns a process for treating thalium-containing waste water produced in particular in the oxidation leaching of the fine dusts produced in the metallurgical processing of sulphide ores, and also containing several other metals such as zinc, lead, cadmium, copper, arsenic, selenium and tellurium. The process involves the addition to the effluent of a solution of alkali ...

Thallium Telluride | AMERICAN ELEMENTS

Thallium Telluride (Tl 2 Te) is a crystal grown product generally immediately available in most volumes. Technical, research and safety (MSDS) information is available as is a Reference Calculator for converting relevant units of measurement.

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Thallium - United States Court of Appeals for the Ninth ...

Thallium is found in the minerals crookesite TlCu7Se4, hutchinsonite TlPbAs5S9, and lorandite TlAsS2.[23] Thallium also occurs as a trace element in iron pyrite, and thallium is extracted as a by-product of roasting this mineral for the production of sulfuric acid.[2][24] Thallium can also be obtained from the smelting of lead and zinc ores.

Thallium - Wikipedia

Thallium is a chemical element with the symbol Tl and atomic number 81. It is a gray post-transition metal that is not found free in nature. When isolated, thallium resembles tin, but discolors when exposed to air. Chemists William Crookes and Claude-Auguste Lamy discovered thallium independently in 1861, in residues of sulfuric acid production.

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The Mineral Commodity Summaries publication is part of the core function of the minerals information activities transferred from the U.S. Bureau of Mines to the USGS in 1996. These publications are now the responsibility of the Minerals Information Team (MIT). These publications cover mineral commodities and are published annually.

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Thallium - Periodic table

Thallium can also be obtained from the smelting of lead and zinc ores. Isotopes: Thallium has 31 isotopes whose half-lives are known, with mass numbers from 179 to 210. Naturally occurring thallium is a mixture of its two stable isotopes, 203 Tl and 205 Tl with natural abundances of …

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Thallium (Tl) - Chemical properties, Health and ...

Thallium in the environment. Thallium is not a rare element; it is 10 times more abundant than silver. The element is widely dispersed, mainly in potassium minerals such as sylvite and pollucite. Thallium minerals are rare, but a few are known, such as crookesirte and lorandite. World production of thallium compound is around 30 tonnes per year.

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Tellurium (Te) | AMERICAN ELEMENTS

Tellurium is a p-type semiconductor, and shows greater conductivity in certain directions, depending on alignment of the atoms. Many tellurium compounds exhibit photoconductivity--their conductivity increases slightly with exposure to light--which makes many tellurides candidates for …

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Tellurium - Wikipedia

Tellurium is a chemical element with the symbol Te and atomic number 52. It is a brittle, mildly toxic, rare, silver-white metalloid. Tellurium is chemically related to selenium and sulfur, all three of which are chalcogens. It is occasionally found in native form as elemental crystals.

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Thallium: What Are the Symptoms of Poisoning?

Thallium enters the environment primarily from coal-burning and smelting, in which it is a trace contaminant of the raw materials. It stays in the air, water, and soil for a long time and is not broken down. Some thallium compounds are removed from the atmosphere in rain and snow. It's absorbed by plants and enters the food chain.