Method for sintering ore blending of Jianshan concentrate fines and limonite
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A sintering method and concentrate powder technology, which is applied in the sintering field of Jianshan concentrate powder and high-proportion limonite ore blending, can solve the problem of aggravating the deterioration of air permeability and other problems
Active Publication Date: 2011-03-30
SHANXI TAIGANG STAINLESS STEEL CO LTD
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Problems solved by technology
Blending this ore with Yangdi ore with good assimilation and fluidity will aggravate the deterioration of air permeability in the
Method used
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Embodiment 1
[0107] The sintering method of this Jianshan concentrate powder and high-proportion limonite ore blending includes the following steps in sequence:
[0108] (1) Material preparation in sinter yard, (2) Yangdi ore pre-wetting, (3) iron material batching, (4) mixed iron material, flux and fuel batching, (5) primary mixer mixing, (6) Secondary mixing machine granulation, (7) Tertiary mixing machine enhanced granulation, (8) Cloth and pressure material, (9) Ignition and heat preservation, (10) Ventilation sintering, (11) Cooling, (12) Refinement grain.
[0109] Specific steps are as follows:
[0110] (1) Preparation of sintered materials
[0111] Receive all kinds of iron materials, fluxes and coke powder in the primary stock yard. Jianshan powder is directly discharged to the material site through the belt, imported mineral powder (PB powder, Yangdi powder) is unloaded from the train to the material bar of the material site through a dumper; the dolomite in the flux is pulled ...
Embodiment 2
[0146] The difference between the present embodiment and embodiment one is that there is no miscellaneous ore powder in the iron material batching material of step (3) iron material batching, and the mass portion proportioning of the iron material batching material is:
[0147] Jianshan Mineral Powder 45 Wetting Yangdi Mineral Powder 38.5 (adding 9% water relative to Yangdi Mineral) PB Powder 13
[0148] To ensure that after mixing, the mass proportion of dry mineral powder is:
[0149] Jianshan mineral powder 47 Yangdi mineral powder 35 PB powder 14.
[0150] Other steps are the same as those in Embodiment 1.
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Abstract
The invention discloses a method for sintering ore blending of Jianshan concentrate fines and limonite, which comprises the following steps of: (1) preparing materials at a sintering site; (2) pre-humidifying Yangdi fines; (3) preparing iron materials; (4) blending the prepared iron materials, flux and fuel; (5) mixing the materials in a primary mixer; (6) pelletizing in a secondary mixer; (7) forcefully pelletizing in a ternary mixer; (8) distributing and pressing the materials; (9) igniting and keeping temperature; (10) sintering by pumping air; (11) cooling; (12) granulating. The method is mainly characterized in that: when the Yangdi fines are pre-humidified, the pre-humidifying moisture reaches 8.5 to 9.5 percent; in step (3), the iron materials comprise 40 to 50 parts of Jianshan fines, 33.5 to 43.5 parts of humidified Yangdi fines, 10 to 16 parts of pilbarablend (PB) fines and 0 to 4 parts of mixed fines; and in step (4), the mass part ratio of the mixed iron materials to blast-furnace return mine to lime to dolomite to coke powder is 77.8-78.8: 7-8: 4.8-5.7: 6-7: 2-3. In the invention, the ore blending is low in cost and cheap minerals are used rationally.
Description
technical field [0001] The invention relates to a sintering method for blending Jianshan fine ore powder and limonite, in particular to a sintering method for blending Jianshan fine ore powder and high-proportion limonite. Background technique [0002] In order to enhance the competitiveness of enterprises and reduce the cost of blast furnace hot metal smelting, it is necessary to use some cheap ores in the sintering batch as much as possible, and cheap ores are generally refractory ores with poor sintering performance. For example, Yandi ore (YANDI FINES) in limonite has high crystal water content, low melting point, and loose structure. When it is suddenly exposed to high temperature, a large amount of crystal water contained in it will evaporate violently, causing a rapid volume expansion and resulting in material The granulation balls in the layer are burst and crushed, which seriously affects the air permeability of the material layer; and during the sintering process, ...
Claims
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