Sulfur-fixing agent for carbon-containing pellets and preparation method thereof

Abstract

The invention provides a sulfur-fixing agent for carbon-containing pellets and a preparation method thereof. The sulfur-fixing agent comprises the following components by mass percent: 25-35% of limestone, 1-5% of industrial manganese slag, 35-39% of red mud and 25-35% of dolomite. The preparation method comprises the following steps of mixing the industrial manganese slag and the red mud with limestone and dolomite in proportion, adding water and stirring the materials for 10-20 minutes and then drying the mixture until the water content is lower than 7%; re-breaking the dried sample, sieving the broken sample until the powder with grain size being less than 200 meshes and mass percent being more than 90% is obtained, thus preparing the finished product sulfur-fixing agent. The sulfur-fixing agent has the advantages that the sulfur-fixing agent can effectively reduce the emission of the harmful gas SO2 in the reduction processes of the carbon-containing pellets and reduce atmospheric pollution; the red mud and the industrial manganese slag are industrial wastes, thus being beneficial to secondary utilization of resources; the used raw materials are low in prices and are easier to obtain; the sulfur-fixing agent is small in usage amount, has obvious sulfur-fixing effects, is low in production cost and is suitable for industrial production and application.

Description

technical field [0001] The invention belongs to the field of ironmaking pellets, in particular to a method for reducing SO in the reduction process 2 Disclosed is a sulfur-fixing agent for carbon-containing pellets and a preparation method thereof. Background technique [0002] Carbon-containing pellets are a mixture of iron-containing powder (mainly iron concentrate powder) and carbon-containing raw materials (mainly coal powder), and a certain pressure is applied externally to consolidate the iron-containing powder and carbon-containing raw materials into agglomerates. Compared with the traditional high-temperature sintering agglomeration process, it effectively shortens the iron and steel metallurgical process, simplifies the process, and reduces production energy consumption. At the same time, the iron-containing raw material is in close contact with the reducing agent to increase the contact area, and can quickly reduce iron oxides during the reduction process, which h...

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Problems solved by technology

[0006] 1) The amount of use is large, and the general use amount accounts for 7% to 15% of the coal. If it is applied to carbon-containing pellets, the grade of carbon-containing pellets will be greatly reduced, and the metallization rate will be reduced

[0007] 2) A large amount of impurities and metallurgical harmful elements are brought in. The sulfur-fixing agent for coal mainly considers the sulfur-fixing effect during the coal combustion process, and does not consider metallurgical production. Therefore, the existing coal sulfur-fixing agents generally add a large amount of metallurgical harmful elements. In the production process of carbon-containing pellets, it is bound to affect the production

[0008] 3) The reduction production process of carbon-containing pellets is quite different from the combustion process of coal-fired boilers, and the environment and temperature are different, so the sulfur-fixing agent for coal cannot be directly applied to carbon-containing pellets

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