Alkali and white mud for desulphurization serve two purposes

Ammonia Soda Plant White Mud for boiler flue gas desulfurization technology is suitable for flue gas desulfurization of ammonia boilers and coal boilers of other companies that are in close proximity to ammonia and alkali companies. The technology produces a large amount of waste residue white mud during the production process of ammonia-alkali soda ash process. At the same time, sulfur dioxide in the flue gas generated from the operation of coal-fired boilers is desulfurized to realize the two-way treatment of white mud-sulfur dioxide, which can serve two purposes.
The main content of the technology is: white mud made of slurry as flue gas desulfurizer, desulfurization efficiency of 95%; after the white mud desulfurization, the product gypsum is used as cement preparation material, and the product reaches the national standard. In addition, the solubility of seawater to calcium sulfate can also be used to discharge the white mud desulfurized product into the sea.
The desulfurization efficiency of this technology is stably maintained at more than 90%, and it can be widely used in desulfurization projects of boiler flue gas and other sulfur dioxide-containing waste gas. Taking a 220 ton/hr boiler and 7,000 hours of operation per year as an example, it can make use of about 6,000 tons of white mud and reduce sulfur dioxide emissions by about 3,000 tons. Using white mud as a desulfurizer can save a lot of resources such as calcium oxide, magnesium oxide and soda ash compared with other flue gas desulfurization methods. In addition, the comprehensive utilization of gypsum desulfurization products has a good market prospect and good social and economic benefits. 600,000 tons/year soda ash company can produce 300,000 to 350,000 tons of wet alkali slag (50% moisture) per year. All of them can be used for desulfurization to reduce sulfur dioxide emissions by about 64,000 tons and create economic value of more than 60 million yuan.
The technology is independently developed by the domestic company. Qingdao Alkali Industry Co., Ltd. will directly use part of the dry-base white mud for the desulfurization of coal-fired boilers of the company and the two major power plants in Qingdao. Seawater is used as a medium and white mud is added as The desulfurization agent enters the integrated treatment tank after absorbing sulfur dioxide through the absorption tower, and the effluent is mixed with the secondary seawater to meet the standard emission. Guangdong Southern Soda Industry Co., Ltd. uses ammonia sludge from the ammonia soda plant to remove sulfur dioxide from the boiler flue gas to produce gypsum. The desulfurization efficiency is greater than 95%, the byproduct gypsum purity is greater than 85%, and the gypsum moisture content is less than 4%.
This technology has been selected into the Soda Industry Clean Production Technology Promotion Program Promotion Technology Catalogue and is currently in the promotion stage.

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