Iron ore sintering method using Ti-Fe as nitrogen fixing agent
A nitrogen-fixing agent and iron ore technology, applied in the field of sintering, can solve the problems of reducing NOx and low calorific value of sintering flue gas, and achieve the effect of reducing nitrogen oxides and saving energy
Pending Publication Date: 2022-04-15
ANGANG STEEL CO LTD
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Problems solved by technology
[0006] The focus of the present invention is that the oxidation sequence of N and titanium is higher than that of N and oxygen. At the same time, the oxidation of metal iron can release heat to solve the problem that the calorific value of general low-N coal types is also low. For this reason, the sintering mixture Add Ti-Fe to reduce NOx in sintering flue gas
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[0020] Below by embodiment the present invention will be further described.
[0021] In the embodiment of the present invention, batching-mixing-sintering is carried out according to the component distribution ratio of the technical solution.
[0022] The composition of the Ti-Fe alloy powder of the embodiment of the present invention is shown in Table 1. The sintering batching scheme of the embodiment of the present invention is shown in Table 2. The influence of Ti-Fe and coke powder premixing on NOx in flue gas is shown in Table 3.
[0023] A method for sintering iron ore using Ti-Fe as a nitrogen-fixing agent, comprising a batching-mixing-granulation-sintering process, characterized in that in the batching process, fossil fuels are pre-mixed with a nitrogen-fixing agent and then mixed with other iron-containing materials and Flux participates in the sintering process.
[0024] The nitrogen fixing agent is Ti-Fe alloy powder.
[0025] During the batching process, the ma...
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Abstract
The invention provides a method for sintering iron ore by using Ti-Fe as a nitrogen-fixing agent, fossil fuel and the nitrogen-fixing agent are premixed in the burdening process, then the mixture, other iron-containing materials and a flux participate in the sintering process, the nitrogen-fixing agent is Ti-Fe alloy powder, and the mass ratio d of the fossil fuel to the Ti-Fe alloy powder is (45-65): (0.4-1.2) in the burdening process. After the Ti-Fe powder is added in the sintering process, the temperature of a sintering combustion layer can be reduced by 50-200 DEG C, the content of nitric oxide in sintering flue gas is reduced by 50-120 mg / m < 3 > under the catalytic decomposition effect of calcium ferrite on nitric oxide, steelmaking by-products are fully utilized, energy is saved, and the purpose of reducing the nitric oxide in the sintering flue gas is achieved.
Description
technical field [0001] The invention belongs to the field of sintering, in particular to an iron ore sintering method using Ti-Fe as a nitrogen fixing agent. Background technique [0002] In recent years, the iron and steel industry has developed rapidly, and at the same time, environmental pollution has become increasingly prominent. Sintering flue gas pollutants mainly include sulfides and nitrides. At present, most of the sintering process does not have a nitrogen oxide removal device. As a major pollutant, it is currently a mandatory requirement in environmental monitoring, and it is tested as a major pollutant. If it exceeds the standard, it will be forced to shut down. Sintering, as the front-end process of the iron and steel process, directly affects the continuity of iron and steel production. Ensuring continuous sintering production is the key task to ensure ironmaking production. [0003] To reduce sintered nitrogen oxides, which are mainly fuel-type nitrogen oxid...
Claims
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IPC IPC(8): C22B1/24C22B1/242C22B1/16
Inventor 任伟王亮韩子文李金莲张立国张伟朱建伟胡绍磊张帅
Owner ANGANG STEEL CO LTD