Method of wastes processing from zinc manufacturing

FIELD: metallurgy.

SUBSTANCE: invention relates to geotechnology and hydrometallurgy and is provided for processing of zinc clinker, which is a waste of zinc manufacturing. Processing method of zinc clinker includes clinker crushing, magnetic separation, flotation of non-magnetic fraction and leaching of magnetic fraction. Clinker crushing is implemented up to fineness 1-5 mm. Magnetic fraction without additional crumbling up is subject to heap leaching.

EFFECT: providing of cost saving of processing ensured by expenditures reduction.

1 ex

 

The invention relates to Geotechnology and is intended for the recycling of zinc production in order to extract useful components.

There is a method of recycling zinc production by melting (see Integralov, Basetime, Evelise General metallurgy. M.: metallurgy, 1976, str).

When melting of the waste extract non-ferrous, rare and precious metals, with lower density and viscosity zinc waste, the higher the completeness of extraction of metals and lower costs for smelting. Waste density of zinc production is determined by their content of FeO, in fact, the FeO content in the waste zinc production is (20-40)%, waste density zinc production is quite high, hence the disadvantages described technology requires high energy consumption for recycling zinc production.

There is a method of recycling zinc production zinc Chekov, including the flotation of the zinc Chekov and sulfuric acid leaching of flotation concentrate from getting filtered solid product, which is then leached thiourea, and the pregnant solution is subjected to electrolysis for the recovery of silver (see, patent RF №2192488, a Method of processing zinc Chekov).

The disadvantage of this method is that for about the westline flotation must be pre-shredding of waste mills, because of high material and energy costs, in addition, leaching of wastes is carried out in campaign mode, which causes an increased flow of leaching reagent due to the large surface reactions due to Tonino grinding, and all together leads to a significant increase in the cost of recycling zinc production.

The closest analogue is the method of processing zinc clinker, which is going zinc production, including magnetic separation clinker, after which the magnetic fraction is processed by leaching and non-magnetic fraction was processed by flotation (SU 1836461).

Objective of the claimed invention is to provide a method of processing that reduce the cost of processing and extraction of useful components from zinc clinker.

The problem is solved by creating a method for processing zinc clinker, comprising grinding the clinker, magnetic separation, flotation nonmagnetic fractions and leaching magnetic fraction, and the crushing of clinker lead to a particle size of 1-5 mm, and its magnetic fraction is subjected to heap leaching.

The division of the clinker on the magnetic and nonmagnetic fractions provides a significant reduction of processing costs, in particular for grinding for flotation, as flattie is processed only smaller part of the clinker - the nonmagnetic fraction, from which the flotation method remove carbon, which is used as fuel. When conducting magnetic separation of zinc clinker provide the minimum content of organic matter in the magnetic fraction, which provides an exception resultant deposition rates of heavy metals. Most of the waste - magnetic fraction is processed by leaching, when processing the magnetic fraction containing more than 90% of all metals heap leaching is not required grinding waste, and only their fragmentation, which is associated with lower costs compared to grinding.

Thus, the technical result achieved is to provide the possibility of reducing the proportion of waste clinker, which is then subjected to expensive grinding before processing.

The processing of zinc clinker - waste production is as follows.

Example

Waste zinc production - clinker subjected to crushing to a particle size of 1-5 mm, necessary for carrying out magnetic separation of waste, then it is sent to magnetic separation and separate the waste into magnetic and nonmagnetic fractions, this ensures that the most part of non-ferrous metals in the magnetic fraction and carbon in the non-magnetic fraction. Then the magnetic fraction with a forklift uklady who is in a bunch of pre-prepared waterproofing the Foundation. The most optimal possible heap settings: length - 1000 m, a width of 200 m and a height of 10 meters After the pile is formed, its surface is level, construct the irrigation system and serves leach solution with a density of irrigation, for example, 35 l/m2hour. Leach solution preferably contains H2SO4- 40 g/l active chlorine - 50 g/l, surface active substances (surfactants)with sorption properties. Surfactant at a concentration in the leaching solution at 0.5 g/l improves the filtration properties of the leach solution and does not give useful components to parasagitta, so the pregnant solution after doreplace reagent to the initial concentration now goes back on irrigation. It is advisable to perform 3-5 turns productive solution, up to a maximum drop of double salts in rastvorennye productive solution. Enriched with useful components of a productive solution process and extract useful components.

Periodic doreplace composition of the leach solution allows you to change the equilibrium state of a productive solution at low and safe concentrations of aggressive solvent and extract useful components with high completeness.

Non-magnetic fraction was processed by flotation.

The content of FeO in the magni is Noah faction after heap leaching is reduced to (10-15)%, as a consequence of the reduced density Chekov heap leaching to 1.1-1.2 t/m3due to this, when the heat increases the completeness of extraction of gold and silver, and reduced energy costs for smelting.

The proposed method for processing zinc clinker waste zinc production in comparison with the known reduces the cost of recycling by reducing the costs of preparing waste for recycling, since only a smaller part of the waste is subjected to grinding, and for the most part is quite crushing.

A method of processing zinc clinker, comprising grinding the clinker, magnetic separation, flotation nonmagnetic fractions and leaching magnetic fraction, characterized in that the crushing of clinker lead to a particle size of 1-5 mm, and its magnetic fraction is subjected to heap leaching.



 

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1 tbl

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