Method for processing ash-slag waste

 

(57) Abstract:

The invention relates to ferrous and nonferrous metallurgy, in particular to the field of processing of toxins and can be used to extract metals and sand from the waste. The technical effect is to create a new method for processing ash waste, allowing to extract additional non-ferrous metals. For this ash wastes subjected to magnetic separation to separate the iron concentrate from ash, then ash fractionary screening emitting quicklime, fly ash gravel, coarse and fine sand, then produce the separation of heavy metals from sand by dividing the density and subsequent separation of sand and coal conductivity.

The invention relates to ferrous and nonferrous metallurgy, in particular to the field of processing toxins, and can be used to extract metals and sand from the slag.

The authors proposed not previously described method for processing ash waste with electrostatic precipitators and flue pipes of power plants, coal-fired.

There are ways to recycle decaying metallurgical slag, processing mixtures metallurgical about 2145361, 2156315, MKI 22 IN 7/04).

These methods are aimed at recycling steel production and is not acceptable for processing slag waste power plants.

The closest way to the claimed is a method for processing ash waste, for example, contains germanium, including fractionation and subsequent processing for the extraction of metals (Tannaim Century. And. and other Chemistry, Germany, M., "Chemistry", 1967, S. 373, para.4).

The disadvantage of this method is that this method is also aimed at the recycling of metallurgical production.

The invention solves the problem of disposal of waste from power plants running on coal, reduce pollution and increase efficiency of production due to the reduction in its volume, as well as the possibility of using the resulting secondary raw materials in production.

The technical result is to create a new integrated method for processing ash waste from power plants, allowing to extract non-ferrous metals.

This technical result is achieved in the method for processing ash wastes to retrieve the accurate separation for separation of iron ore concentrate from ash, fractionation of ash lead screening emitting quicklime, fly ash gravel, coarse and fine sand containing non-ferrous metals and coal, and subsequent separation of non-ferrous metals from sand lead by separation by density, with subsequent separation of sand and coal conductivity.

The essence of the proposed method for processing ash waste is as follows.

Ash wastes subjected to magnetic separation to separate the iron oxides from the ashes, and then produce a fractionation of ash screening emitting lime, coarse and fine sand containing non-ferrous metals and coal, ash gravel, then produce separation density on concentration tables of sand and separation of heavy metals from sand and subsequent separation of sand and coal conductivity electroseparation.

The proposed technology involves the use of magnetic separation for separation of iron concentrate. Screening ash residue contributes to the disintegration of the slag into fractions by mechanical impact. Gravity separation of the sand provides the separation of heavy metals. Subsequent Kovich waste with electrostatic precipitators and flue pipes Berezovskaya power plant comes to magnetic separation. After separation of iron oxides from ash received 20 kg of iron concentrate containing 4 kg FeO, 7 kg Fe2ABOUT3, 9 kg Fe3O4and ash 80 kg of the Obtained iron-containing concentrate is delivered to the warehouse of finished products. Ash 80 kg arrives at the screening.

Under the influence of the mechanical movement and rolling is the separation of ash particles into fractions, and the Department Cao (quicklime) from the other components. In bunkers settle lime, gravel and sand containing non-ferrous metals and coal. Lime and gravel from the bunkers delivered to the warehouse. After fractionation received 20 kg of Cao, 5 kg of gravel, 35 kg of fine sand (fraction 0-0,63 mm) and 20 kg of coarse sand (fraction 0,63-2 mm). Further fractionated sand is fed to the concentration tables, where the separation of the sand containing charcoal, and concentrate non-ferrous metals. Concentrate non-ferrous metals enters the hopper, and then for further processing. When the separation are selected from a small fraction (0-0,63 mm): 2 kg of non-ferrous metals, containing 0.22 kg AND2ABOUT3, 0.1 kg CuO, 0.1 kg of gallium, 0.05 kg of vanadium, 0.1 kg of silver, 0,005 kg of gold, 0.05 kg of chromium, 0.1 kg of manganese, 0.1 to cobalt, 0.4 kg of iron (hematite) and 0.217 kg beryllium, nd, Yb, d'itria, lanthanum, niobium, tin, scandium, thorium, uranium) and 33 kg of sand containing charcoal. From large fraction (0,63-22 mm) is obtained: 2 kg of non-ferrous metals containing 0.27 kg AND2ABOUT3, 0.11 kg SIO, 0.09 kg of gallium, 0.06 kg of vanadium, and 0.09 kg of silver, 0,006 kg of gold, 0.04 kg of chromium, 0.08 kg of manganese, 0.1 kg of titanium, 0.06 kg of barium, 0,005 kg Germany, 0,002 kg molybdenum, 0.08 kg of Nickel, 0.06 kg of lead, and 0.09 kg strontium, 0.11 kg of zinc, 0.06 kg of cobalt, 0.5 kg of iron (hematite) and 0,187 kg beryllium, nd, Yb, d'itria, lanthanum, niobium, tin, scandium, thorium, uranium) and 18 kg of sand containing charcoal. Next, each faction sand containing charcoal, enters electroseparation, where the separation of sand and coal. After the separation obtained respectively 5 kg of coal and 28 kg of sand from the first fraction and 2 kg of coal and 16 kg of sand from the second fraction. Divided coal and building sand delivered to the warehouse.

The use of the claimed method allows you to dispose of ash and slag waste, reduce pollution, improve efficiency, create waste-free technology.

Method for processing ash wastes for recovery of metals, including fractionation, different T ash, fractionation of ash lead screening emitting quicklime, fly ash gravel, coarse and fine sand containing non-ferrous metals and coal, and subsequent separation of non-ferrous metals from sand lead by separation by density, with subsequent separation of sand and coal conductivity.

 

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