Method for manufacturing metallurgic composite pellet by using different binders and two-step pelletizing way
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A composite pellet and binder technology, applied in the field of pelletizing, can solve the problems of low iron grade of inorganic binder pellets, and failure of preheating strength of organic binder pellets to meet industrial requirements, etc.
Active Publication Date: 2014-01-01
UNIV OF SCI & TECH BEIJING
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Problems solved by technology
[0005] In order to solve the problems that the iron grade of inorganic binder pellets is low and the preheating strength of organic binder pellets cannot meet the indu...
Method used
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Embodiment 1
[0023] Raw material ratio: the proportion of inorganic binder for iron-containing materials in the pellet core is 0.5%, and the amount of added water is 8%, the ratio of organic binder for iron-containing materials in the pellet shell is 0.1%, and the amount of added water is 8%. The ratio of pellet core to shell iron-containing raw materials is 1:2.
[0024] Ball making method: disc pelletizing machine or pelletizing machine
[0025] Preheating temperature and time: 900°C, 30min
[0026] Calcination temperature and time: 1200℃, 40min
[0027] Pellet size: 4mm for raw pellets; 8mm for finished pellets
Embodiment 2
[0029] Raw material ratio: the proportion of inorganic binder for iron-containing materials in the core of pellets is 1.5%, and the amount of water added is 10%. The ratio of pellet core to shell iron-containing raw materials is 1:3.
[0030] Ball making method: disc pelletizing machine or pelletizing machine
[0031] Preheating temperature and time: 930°C, 20min
[0032] Roasting temperature and time: 1230°C, 30min
[0033] Pellet size: 5mm for raw pellets; 10mm for finished pellets
Embodiment 3
[0035] Raw material ratio: the proportion of inorganic binder for iron-containing materials in pellet core is 2.5%, and the amount of added water is 12%. The ratio of organic binder for iron-containing materials in pellet shell is 0.7%, and the amount of added water is 12%. The ratio of pellet core to shell iron-containing raw materials is 1:4.
[0036] Ball making method: disc pelletizing machine or pelletizing machine
[0037] Preheating temperature and time: 960°C, 15min
[0038] Roasting temperature and time: 1260°C, 25min
[0039] Pellet size: 6mm for raw pellets; 12mm for finished pellets
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Abstract
The invention provides a method for manufacturing a metallurgic composite pellet by using different binders and a two-step pelletizing way. The method comprises the steps: with an inorganic binder as the binder of a pellet core, preparing the pellet core through disc pelletizing or pressure pelletizing, wherein the diameter of the pellet core is 2-8mm, and the addition amount of the inorganic binder is 0.5-3.5%; with an organic binder as the binder of a pellet shell, attaching an iron-contained raw material onto the pellet core through disc pelletizing or pressure pelletizing to obtain the pellet with the diameter of 8-15mm, wherein the iron-contained raw material contains 0.1-1.0% of organic binder, and the volume ratio of the pellet core to the pellet shell of the obtained pellet is 1:1 to 1:4. Compared with a pellet with the inorganic binder, the pellet prepared by using the method provided by the invention has higher fresh pellet falling strength; in addition, the organic binder at an outer layer burns and decomposes in a roasting process, so that the iron grade of the pellet placed into a furnace is relatively high; compared with a pellet with an organic binder, the pellet prepared by using the method has higher compressive strength. All metallurgical performance indexes of the composite pellet are greatly superior to those of a conventional pellet, so that a relatively considerable economic benefit can be created.
Description
technical field [0001] The present invention relates to the technical field of pelletizing ore pelletizing. Specifically, it is mainly applied to the use of different binders and the selection of pelletizing methods in the production process of pelletizing ore. Compared with inorganic binder pellets, it can Improve the falling strength and iron grade of green pellets, and improve the quality of pellets. Background technique [0002] Pellets have the advantages of good strength, uniform particle size, and good reducibility. In addition to iron concentrate as the main raw material for pellet production, a certain proportion of binder is also required. There are many types of binders. At present, bentonite is mostly used at home and abroad, but with the increase of the amount of bentonite, due to its SiO 2 、Al 2 o 3 The high content of metallurgical impurities such as pellets gradually reduces the iron content of the pellets, resulting in deterioration of the metallurgical p...
Claims
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Application Information
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