A device for treating hydrogen sulfide tail gas after cadmium removal in a wet-process phosphoric acid process

By using a multi-stage absorption tower series connection and a circulating pump system, the problem of low efficiency in treating hydrogen sulfide tail gas during the cadmium removal process of phosphoric acid was solved, achieving efficient absorption and reuse, reducing production costs and environmental pollution.

CN224506675UActive Publication Date: 2026-07-17HUBEI FORBON TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
HUBEI FORBON TECH
Filing Date
2025-08-08
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing technologies for treating hydrogen sulfide tail gas generated during cadmium removal with phosphoric acid have low absorption efficiency, unreasonable structural design, and low utilization rate of absorbent, making it difficult to meet the special requirements of the cadmium removal process with phosphoric acid. Furthermore, they lack flexible absorbent ratio and flow control.

Method used

A multi-stage absorption tower structure is adopted, in which multiple absorption towers are connected in series, combined with circulation pumps and transfer pumps, to achieve the step-by-step absorption of hydrogen sulfide tail gas. Sodium hydroxide solution is used as the absorbent to ensure the full absorption and reuse of hydrogen sulfide gas.

Benefits of technology

It improves the absorption efficiency of hydrogen sulfide tail gas, reduces production costs, reduces environmental pollution, and achieves efficient resource utilization and a safe production environment.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to a kind of hydrogen sulfide tail gas's processing device after cadmium removal of wet-process phosphoric acid process, including absorption tower, circulating pump, pipeline, delivery pump, fan, absorbent storage tank, hydrogen sulfide tail gas is connected to the bottom of first absorption tower by pipeline, the top exhaust port of first absorption tower is connected by pipeline with the bottom of second absorption tower, the top exhaust port of second absorption tower is connected by pipeline with the bottom of third absorption tower, until the bottom of last absorption tower is connected, the top exhaust port of last absorption tower is connected to chimney by fan;Delivery pump is connected between absorbent storage tank and the upper spray layer of one of absorption tower, to provide absorbent for absorption tower;The bottom of each absorption tower is connected with a circulating pump, and the other end of circulating pump is connected with the upper spray layer of adjacent absorption tower or absorbent storage tank.The utility model device realizes the absorption of hydrogen sulfide gas, which is conducive to reducing the emission of toxic tail gas in the process of cadmium removal of wet-process phosphoric acid.
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Claims

1. A device for treating hydrogen sulfide tail gas after cadmium removal in a wet-process phosphoric acid process, comprising a plurality of absorption towers, a plurality of circulating pumps, a plurality of pipelines, a delivery pump, a fan, and an absorbent storage tank, characterized in that: Hydrogen sulfide tail gas is connected to the bottom of the first absorption tower via a pipeline. The top exhaust port of the first absorption tower is connected to the bottom of the second absorption tower via a pipeline. The top exhaust port of the second absorption tower is connected to the bottom of the third absorption tower via a pipeline, and so on until it reaches the bottom of the last absorption tower. The top exhaust port of the last absorption tower is connected to a chimney via a fan. A delivery pump is connected between the absorbent storage tank and the upper spray layer of one of the absorption towers to supply absorbent to the absorption towers. A circulation pump is connected to the bottom of each absorption tower, and the other end of the circulation pump is connected to the upper spray layer or absorbent storage tank of the adjacent absorption tower.

2. A device for treating hydrogen sulfide tail gas after cadmium removal in a wet-process phosphoric acid process according to claim 1, characterized in that The number of absorption towers is 2-4.