ources of selenium and tellurium
Selenium and tellurium are extremely rare elements, and the crust contains 10B-10% selenium by weight and 10b-60% Terulla. Selenium and tellurium are natural minerals, mainly selenium and sulfide, among which selenium is less related to copper, silver, silver, nickel, nickel, cobalt, bismuth, silver and gold, and less related to copper, lead, lead, mercury, nickel and platinum. In the dispersed state, selenium and tellurium occur as isomorphic mixtures in coltan (iron sulfide, copper, zinc, lead) and natural sulfur. Selenium and tellurium levels in Colchedam and sulphur can be as high as one thousandth or even one hundredth.
At the same time, selenium as an element closer to sulfur is more likely to replace it in sulfur compounds. The latter are more likely to produce their own minerals.
When selenium and tellur are processed, they accumulate in the waste: in the dust of the roasting furnace, in the anode slag of the electrolytic copper, in the silt of the sulfuric acid plant.
These products are a major source of selenium. Self-sufficiency in minerals doesn't matter. Possible sources are selenium, especially iron ore.
The main sources of selenium and tellurium are electrolytic refined copper anode slime.
The electrolysis of copper sulfate accumulates anode silt in an electrolyte of sulfuric acid, which contains many valuable metals: gold, silver, selenium, tellurium, arsenic, antimony, and bismuth. The following is the general composition of anode slag (%):
Selena and Trulla's source
Selena and Trure extract gold and silver from the slag.
The second important source (mainly selenium) is dust accumulated in the gas cooling and purification systems of stoves, or contact with natural sulphur in the production of sulphuric acid and sulphide cellulose. Depending on the composition of the raw material and the mode of gas purification, dust contains between one-tenth and 80% Se.
The most abundant selenium dust is captured by the hydroelectric filter. They burn up to 45 to 55 percent selenium and up to 80 percent sulfur selenide.
The thermoelectric filter contains a small amount of selenium (dust 0.1-0.2% Se).
In cooling towers and flushing towers (which are installed prior to the hydro-electric filter), lower slag is produced. From the tank for washing acid sludge contains 3 to 15% Se с е р н о seem и с л о т н factory. In addition, a portion of selenium is present in the rinse solution in the form of selenic acid. At a certain concentration, the solution rotates and exits the process. A solution of selenium is easily released by a solution of sulfide gas.
In sulfuric acid production, selenium and tellurium accumulate in lead chamber walls and glover tower silt in addition to cinder treatment systems. Lead sulphate or mainly in its basic form is found in selenium and tellurium at 0.5 to 3%.
Indoor or primary source of selenium. However, this source is now secondary.