Guide
1
Lead is a good absorber of gamma radiation, but it is a poor conductor of electricity and heat.To lead is characterized by the oxidation state of 2 (most likely), and 4.
2
There are about 80 minerals that contain lead.The most famous of them - galena, it is called galena.The highest value for the industry and have cerussite anglesite.In the waters of the oceans of lead contained 0.03 g / l, a total of about 41.1 million tons in the river waters - 0,2-8,7 mg / l.
3
Lead is a low-melting metal, at the same time it is considered heavy nonferrous metals.It is soft and malleable, from it you can easily make the thinnest sheets.Copper increases the corrosion resistance, and adding the antimony increases the hardness and acid resistance of lead with respect to sulfuric acid.
4
Lead relatively inert chemically, in dry air
, it does not oxidize, but tarnishes in moist and covered with an oxide film.Upon reaction with oxygen forms a number of oxides.Lead does not react with dilute hydrochloric acid and sulfuric acid at room temperature, as formed on its surface sparingly soluble films which prevent further dissolution of the metal.
5
With respect to the aqueous ammonia and alkali resistant lead, his best solvent - diluted acetic acid or nitric acid.This produces acetate and lead nitrate, the metal is also significantly soluble in formic acid, tartaric acid and citric acid.
6
Lead reacts with halogens when heated, when it interacts with hydrazoic acid formed lead azide, when heated with sulfur - sulfide.For lead hydrides not characterized, but in some reactions, can be found tetragidrid lead - colorless gas that is easily decomposed to lead and hydrogen.
7
main source of lead sulfide ores are.Of these recovered lead concentrates by selective flotation.Typically, lead concentrate comprises 40-75% lead, 5% copper, 5 to 10% zinc and precious metals.About 90% of the lead prepared by methods agglomerating roasting of sulfide concentrates mine reducing smelting and refining lead bullion.
8
In terms of consumption and production of non-ferrous metals lead in fourth place.Up to 45% is used to produce electrodes for batteries, and about 20% - to manufacture cables, wires and coating them.Lead is widely used to build the equipment in the chemical industry, as well as screens for protecting against x-ray or radioactive radiation.