A low-concentration flue gas desulfurization method for hydropower silicon smelting

Abstract

The invention discloses a method for desulfurizing low-concentration flue gas from hydropower silicon smelting. The method includes the following steps: 1) preparation of absorption slurry: thoroughly mix the desulfurization adsorbent ground to 325-400 mesh with water to obtain the absorption slurry; 2) Absorption of acid gas: When the flue gas from hydropower silicon smelting enters the desulfurization system, the absorption slurry and the flue gas are fully contacted in the desulfurization tower, so that the acid gas and particles in the flue gas are absorbed by the absorption slurry; 3) Flue gas Emissions: detection of outlet SO 2 If the emission concentration meets the requirements, it can be discharged, and if it does not meet the requirements, it can be returned to the desulfurization system for treatment, and the absorbed absorption slurry is filtered, and the filtrate is returned to step (2) as the absorption liquid, and the filter residue is sold as a by-product. The present invention uses limestone and other desulfurization adsorbents mixed with water to make absorption slurry, and the flue gas enters the desulfurization system and fully contacts with the slurry to remove acid gas and particulate matter, so that the emission concentration of sulfur dioxide in the flue gas is reduced to 80mg / Nm 3 Below, effectively realize green and environment-friendly production.

Description

technical field [0001] The invention belongs to the technical field of flue gas desulfurization treatment, and in particular relates to a low-concentration flue gas desulfurization method for hydropower silicon smelting. Background technique [0002] Industrial silicon production is a production process in which silicon ore is used as raw material and carbon material is used as reducing agent to smelt in an electric furnace container. The essence of the reaction is to smelt and purify silicon by redox reaction between reducing carbon and silicon dioxide. Relying on abundant silicon mineral resources and hydropower energy, Yunnan Province has obvious advantages and conditions to promote the development of hydropower silicon industry. At the same time, it also puts forward new requirements for green and environmental protection production. The most important thing is the low-concentration flue gas treatment of hydropower silicon smelting . [0003] The discharge of electric f...

AI Technical Summary

Problems solved by technology

The high content of silica in the flue gas is very harmful to the desulfurization system. The silica entering the absorption slurry will hinder the chemical reaction in the system to a certain extent, resulting in the desulfurization efficiency and poor gypsum quality.

Moreover, the particle size of silicon dust in the flue gas is mostly less than 1 μm. If things go on like this, it will also cause a relatively large health hazard to the corresponding staff.

[0004] Limestone wet desulfurization methods have been used in the prior art, but most of them are aimed at traditional zinc, copper and other smelting processes, and most of them are thermal power smelting, the exhaust gas volume and sulfur content are extremely high, and the silicon dioxide content is almost negligible

Although there are existing literatures on flue gas treatment of silicon smelting, most of them are directly following the flue gas treatment parameters of other metal smelting processes