Flotation cell anti-corrosion method in sulfur flotation technology

Abstract

The invention discloses a flotation cell anti-corrosion method in a sulfur flotation technology. Stainless steel bolts are uniformly distributed in and welded with the interior of a stainless steel cell body and extend outside from the inner surface of the stainless steel cell body inward; drilled PP plates are fixed on the stainless steel bolts of the stainless steel cell body respectively and are compressed by screw caps respectively, and a gap between each PP plate and the inner wall of the stainless steel cell body is eliminated; a plastic cover cap sleeves the extension end of each stainless steel bolt and is welded with the PP plate to ensure that each stainless steel bolt is completely isolated from liquid in a flotation cell; and a gap between two adjacent PP plates is welded by adopting a double-wire PP welding bar to form a sealing structure. According to the flotation cell anti-corrosion method in the sulfur flotation technology, the PP plates are adopted to transform the original 316L stainless steel flotation cell to be of a double-layer structure, and liquid in the cell is in contact with the PP plates only, so that the stainless steel cell body can be completely avoided from being corroded by chloride ions and the like in the liquid, the service life of the flotation cell is greatly prolonged, the maintenance frequency is lowered, and the whole method for realizing corrosion resistance is simple and is very low in cost.

Description

technical field [0001] The invention relates to the technical field of mineral flotation equipment, in particular to an anti-corrosion treatment method for a flotation tank used in a sulfur flotation process. Background technique [0002] The flotation cell is a tank container used to realize the flotation process in the flotation equipment. In the flotation tank, during the flotation process of sulfur residue, the sulfur residue contains acidic substances after leaching, especially CL - The corrosion of the tank seriously affects the safe use of the equipment, and the stirring of the impeller will cause wear to the tank. In short, the combined effect of wear and flotation in the flotation process is more destructive than single wear or corrosion, which seriously affects the normal operation of the enterprise. [0003] The raw sulfur recovery flotation cell is welded by 316L stainless steel plate, 316L stainless steel is a single-phase austenitic structure, and its materia...

AI Technical Summary

Problems solved by technology

In the flotation tank, during the flotation process of sulfur residue, the sulfur residue contains acidic substances after leaching, especially CL - The corrosion of the tank seriously affects the safe use of the equipment, and the stirring of the impeller will cause wear to the tank

In short, the combined effect of wear and flotation in the flotation process is more destructive than single wear or corrosion, seriously affecting the normal operation of enterprises

[0003] The raw sulfur recovery flotation cell is welded by 316L stainless steel plate, 316L stainless steel is a single-phase austenitic structure, and its material composition is 022Cr17Ni12Mo2, which has corrosion resistance, wear resistance and high temperature resistance. However, due to the special material of stainless steel Multiple factors such as resistance, welding process and use environment will cause performance degradation

[0004] CL during production - Continuous enrichment, while the concentration limit of 316L stainless steel being corroded by chloride ions is 250mg / L, the CL in the liquid of the raw sulfur recovery flotation production system - When the concentration reaches 3000mg / L, at this time, the corrosion resistance of 316L stainless steel will show a downward trend, resulting in severe corrosion and large-scale leakage in the case of continuous production of the flotation cell for less than one year. A large number of green crystals appeared, and Cr and Ni elements in the stainless steel material were precipitated, resulting in forced interruption of production

However, the complete replacement of the new flotation cell plus on-site construction costs such as production and installation costs is quite expensive, which will greatly increase the burden on the enterprise

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