Method of treating vacuum potassium carbonate desulfurization waste liquid through acidic separation-out/oxidization process

Abstract

The invention discloses a method of treating a vacuum potassium carbonate desulfurization waste liquid through an acidic separation-out / oxidization process. In the invention, the vacuum potassium carbonate desulfurization waste liquid is added by an acid to perform acid-out, wherein the separated hydrogen sulfide and hydrogen cyanide gases are mixed with acidic gas come out from a vacuum potassium carbonate desulfurization and regeneration column. The mixed gas is fed into a Claus furnace to recycle sulfur. The waste liquid after the acidic separation is added with an oxidizing agent to remove the residual sulfides and cyanides in the waste liquid. The treated waste liquid, after pH regulation, is discharged into a coking phenolic and cyanide wastewater bio-chemical treatment system to perform bio-chemical treatment. The method utilizes a vacuum system arranged on the top of the original vacuum potassium carbonate desulfurization and regeneration column. The method is short in technical process and less in equipment. By means of the process of firstly acid-out and then oxidization, the consumption of the oxidizing agent is less, so that the method is low in operation cost.

Description

technical field [0001] The invention belongs to the technical field of desulfurization waste liquid treatment, and in particular relates to a method for treating vacuum potassium carbonate desulfurization waste liquid by an acid analysis-oxidation process. Background technique [0002] Vacuum potassium carbonate desulfurization is a widely used wet desulfurization technology developed by Anshan Jiao Nai Institute. Due to its high desulfurization efficiency, in addition to Wuhan Iron and Steel Coking Company, there are also domestic coking plants such as Angang New District (Bayuquan) Coking Plant, Baosteel Meishan Coking Plant, Shaogang Coking Plant, Handan Iron and Steel New District and other coking plants. The vacuum potassium carbonate desulfurization process has become a large-scale in recent years. A desulfurization process widely used by coking companies. Although the vacuum potassium carbonate desulfurization situation of each coking plant is not the same, in the ac...

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Problems solved by technology

Due to the complex composition of coke oven gas desulfurization waste liquid, the purity of the obtained yellow blood salt product is not high, and it is difficult to realize resource utilization, which affects the practical application of this technology; CN103395910A proposes a vacuum potassium carbonate desulfurization waste liquid treatment process and device. The method is also to add ferrous salt to the desulfurization waste liquid, and at the same time, cyanide and sulfide are precipitated at the same time, and the mud and water are separated, and the clear liquid is added with an inorganic / organic compound coagulant for a deep decyanation, and the waste after decyanation is refined. The liquid is discharged into the coking biochemical treatment system. This method is an improvement of the previous process, but its treatment process is complicated, the process is cumbersome, and the operating cost is high.

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