Iron ore pre-reduction sintering method and device
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A sintering method and a sintering device technology, which are applied in the field of iron ore sintering, and can solve the problems of accelerating the reduction reaction of iron ore materials and difficult to deal with high CO flue gas
Active Publication Date: 2017-10-31
ZHONGYE-CHANGTIAN INT ENG CO LTD
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This invention cleverly utilizes the double-layer material distribution method, so that the upper layer of the sintering machine trolley is arranged with traditional sintering mixture, and the lower layer is arranged with pre-reduced sintering mixture. The gas treatment method, the high CO flue gas of the rear wind box is recycled, so it can solve the
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Embodiment 1
[0113] A method for pre-reduction sintering of iron ore, the method comprising:
[0114] 1) Preparation of traditional mixture: iron ore powder, flux (it includes the mixture of three raw materials of unslaked limestone, limestone and serpentine; the dosage ratio of these three raw materials makes the control of CaO and SiO in the sinter preparation process 2 The weight ratio is about 1.8:1) to carry out raw material batching, mixing, granulation, obtains traditional mixture (I), wherein the consumption ratio of iron ore powder, flux and coal fuel is 83:12:5;
[0115] 2) Preparation of pre-reduced mixture: mix iron ore powder, additives and coke powder and then pelletize (such as disc pelletizing or briquetting) to obtain pellets (IIa) with internal carbon, wherein: fuel to ore ratio At 0.18:1 (wt), the average pellet diameter is 6 mm;
[0116] The pellet (IIa) with internal carbon is placed in a drum mixer, fuel fine powder and flux are added, mixed, and the outside of the p...
Embodiment 2
[0122] Repeat embodiment 1, only the consumption ratio of iron ore powder, flux and coal fuel in step 1) is 81:15:4; In step 2), the fuel and ore ratio are 0.25:1 (wt) average pellet diameter is 10mm; The mass ratio of pellets with internal carbon, fine fuel powder and flux is 1:0.15:0.01.
[0123] In addition, in addition to including 1) preparation of traditional mixture; 2) preparation of pre-reduced mixture; 3) cloth; 4) sintering, it also includes:
[0124] 5) Oxygen production: use an oxygen generator to separate air to obtain oxygen and nitrogen, in which oxygen is used for flue gas circulation and sintering oxygen distribution, and nitrogen is used for on-board cooling; and the flue gas from the on-board cooling bellows is used for waste heat recovery (waste heat to generate steam or power generation) to be recycled and reused for onboard cooling; and.
[0125] 6) After the sintered sintered cake is crushed, it passes through a hot ore sieve, and the product on the si...
Embodiment 3
[0127] Repeat Example 1, just replace coke powder with pulverized coal, and slaked lime replace quicklime.
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Abstract
The invention provides an iron ore pre-reduction sintering method. The method comprises the steps that firstly, a traditional mixture is prepared, iron ore powder, a solvent and fuel are subjected to raw material matching, mixing and granulating are conducted, and the traditional mixture is obtained; secondly, a pre-reduction mixture is prepared, after the iron ore powder, an additive and the fuel are evenly mixed, pelleting is conducted, carbon-burdened pellets are obtained and placed in a cylinder mixer, fuel fine powder and quick lime or slaked lime are added for wrapping and granulating, and the pre-reduction mixture is obtained; thirdly, material distribution is conducted, a double-layer material distribution manner is adopted, the pre-reduction mixer prepared in the second step is placed on a sintering machine trolley in advance, and the traditional mixture prepared in the first step is placed on the pre-reduction mixture; and fourthly, sintering is conducted, ignition is conducted, and the traditional mixture and the pre-reduction mixture are subjected to smoke circulation type sintering on a sintering machine. The problem that CO smoke is hard to treat is solved, secondary oxidization in the pre-reduction sinter reducing process is reduced, the combustion atmosphere between material layers is improved, the material temperature is increased, and generation of the iron ore material reducing reaction is accelerated.
Description
technical field [0001] The invention relates to an iron ore sintering method and device, more specifically an iron ore pre-reduction sintering method and a device thereof, belonging to the field of iron ore sintering. Background technique [0002] At present, blast furnace ironmaking is the main technology in my country, sintering ore accounts for 70% to 90% of the raw materials into the furnace, and the energy consumption of sintering process accounts for 10% to 15% of ironmaking energy consumption. Inferior question. Traditional sintering process such as figure 1 As shown, the traditional iron ore sintering process mainly uses coke powder and anthracite as fuel to provide heat for the sintering process, and adopts the method of draft sintering to produce high-alkalinity sinter with calcium ferrite as the binder phase. [0003] Japan's JFE first proposed the concept of pre-reduction sinter. As a new technology that has not yet been applied industrially, the pre-reduction s...
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