Desulfurizing agent and preparation method thereof

Abstract

The invention discloses a desulfurizing agent and a preparation method thereof. The desulfurizing agent comprises the following components of: 10 to 15 parts by weight of Na2CO3, 13 to 17 parts by weight of TiO2, 5 to 8 parts by weight of NiCO3, 2.5 to 4 parts by weight of Mg3 (PO4) 2, 0.7 to 1.3 parts by weight of Ce (NO3) 4.6 H2O and 20 to 32 parts by weight of kaolin. According to the desulfurizing agent of the present invention, when the desulfurizing agentis applied in the dry desulfurization, the SO2 in a cement kiln can be effectively cured, and the high temperature re-decomposition ofCaSO4 can be effectively avoided, and therefore, the desulfurization efficiency can be substantially improved. In addition, the invention also discloses a preparation method of the desulfurizing agent. The method is simple and convenient, and is suitable for large-scale industrial application.

Description

technical field [0001] The invention relates to the field of cement production, more specifically, to a desulfurizer and a preparation method thereof. Background technique [0002] The production of Portland cement is based on limestone and clay as the main raw materials. After crushing, batching, and grinding to make raw meal, it is then fed into the cement kiln to calcinate clinker, and then add appropriate amount of gypsum and other mixed materials to the clinker. Or finely ground admixtures. Depending on the raw material preparation method, cement production can be divided into dry method (semi-dry method) and wet method (semi-wet method). No matter which method is used, it needs to be calcined into clinker. [0003] The raw materials and fuels used in cement production contain considerable sulfur-containing compounds, which mainly exist in the form of sulfide or sulfate, and elemental sulfur can be ignored. Among them, most of the sulfides are pyrite and marcasite (bo...

AI Technical Summary

Problems solved by technology

Wet desulfurization usually has better effect and high desulfurization rate, but at the same time, it has high fixed investment, large floor area and difficult maintenance; the main process of dry desulfurization is: Ca(OH) 2 Or CaO is added to the raw meal, and enters the preheater system of the cement kiln with the raw meal, using Ca(OH) 2 Or CaO and SO in flue gas 2 The reaction produces CaSO 3 and CaSO 4 , thus removing SO 2 , and the product can also be used as cement raw material

Although the investment of dry desulfurization is slightly lower, the removal efficiency is low, especially the CaSO formed after sulfur fixation 4 After entering the kiln, it is easy to decompose above 1200°C (CaSO 4 =CaO+SO 2 +O 2 ), forming a sulfur cycle, making it difficult to continuously meet the discharge standards, making it difficult to achieve a removal efficiency of more than 70%

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