Method for continuously recovering sulfur from sulfur foam

Abstract

The invention relates to a method for continuously recovering sulfur from sulfur foam. The prior method has poor recovering effect and large energy consumption. The method of the invention comprises the following steps: firstly, mixing sulfur foam with desalted water in a liquid mixer, depositing the mixture in a sulfur foam tank, conveying the mixture into a centrifugal machine for secondary separation of desulfurized liquid and sulfur, mixing the separated sulfur paste and desalted water in a continuous mixing machine, and then, conveying the mixture into a continuous sulfur melting kettle;melting sulfur suspended particles in the mixed liquid in the continuous sulfur melting kettle, enabling the overflowing mother liquid to enter in the liquid mixer and the continuous mixing machine, and stopping adding the desalted water when the mother liquid enters in the liquid mixer and the continuous mixing machine; and using the mother liquid for replacing the desalted water, and repeating the operation. The method of the invention can continuously recycle solid sulfur, eliminate the influence of temperature rise of the desulfurized liquid to the absorption of hydrogen sulfide and the influence of sulfur secondary salt generated at high temperature to a desulfurization system; and The method of the invention has the advantages of simple and easy implementation, good energy recovery,stable product quality and no discharge of the three wastes.

Description

technical field [0001] The invention belongs to the technical field of chemical industry and relates to a method for continuously recovering sulfur from sulfur foam. Background technique [0002] In chemical fertilizer, coking, town gas and other industries, wet desulfurization technology is mostly used to remove hydrogen sulfide in raw gas. The process is to use an alkaline solution added with a catalyst to absorb the hydrogen sulfide gas contained in the raw material gas in a specific tower. Then, the foam containing sulfur elemental particles is generated and separated by catalytic regeneration with air, usually referred to as sulfur foam. At present, there are roughly two processes for the treatment of sulfur foam. One process is to use a continuous sulfur melting tank to separate and recover the sulfur in the sulfur foam to produce solid sulfur. Specifically: the sulfur foam containing about 1% to 2% of suspended sulfur from the desulfurization regeneration tank first...

AI Technical Summary

Problems solved by technology

For the former process, there are the following disadvantages: the desulfurization liquid contained in the sulfur foam undergoes a long-term high-temperature process in the continuous sulfur melting kettle to generate a large amount of secondary sulfur salts, and the high-temperature desulfurization liquid is directly brought back into the desulfurization system Afterwards, the secondary sulfur salts will accumulate and precipitate in the desulfurization device, causing blockage of the desulfurization device, affecting the desulfurization efficiency and the normal operation of the system; at the same time, the increase in the temperature of the desulfurization liquid will affect the absorption of hydrogen sulfide, and the quality of the produced sulfur products Not good, the color is black or dark green, and the purity is not up to the national standard; the recovery effect is poor, and the desulfurization liquid returned to the desulfurization system has high impurity content; the energy consumption is large, and the sulfur foam tank needs to be heated with steam, and at the same time, it is continuously melted. The heat contained in the desulfurization liquid returned from the sulfur kettle to the system cannot be recovered due to the high content of impurities

However, because the water content of the sulfur paste produced by the second process is relatively high (50%), it cannot be directly used as a finished product to process other products, and it is easy to cause a backlog

When secondary processing is carried out to produce solid sulfur, sulfur-containing gas will be produced to cause environmental pollution, and there are also fatal flaws