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Composite binder for producing oxidized pellets

A technology for oxidizing pellets and binders, applied in the field of smelting, can solve the problems of reducing the compressive strength of high-temperature roasting pellets, high price of organic binders, unstable pellet performance, etc., to improve the falling strength and compressive strength. Strength, improved burst temperature, improved capillary gravitational effect

Inactive Publication Date: 2018-05-08
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The production of pellets is inseparable from the addition of appropriate binders. In the absence of binders, the pellets will not be able to form pellets or the performance of the pellets will be unstable. At present, the more common binder is bentonite, but adding too much Bentonite will reduce the grade of pellets, and some companies try to add organic binder directly, but the effect is not very good, the main reason is that the price of organic binder is high, it is easy to burn and decompose at high temperature, and reduces the compressive strength of high-temperature roasted pellets

Method used

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  • Composite binder for producing oxidized pellets

Examples

Experimental program
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Effect test

Embodiment 1

[0023] First prepare a new type of composite binder: S1, dissolve 5kg of polyvinyl alcohol in 40kg of hot water at a temperature of 80°C, stir to dissolve, add 0.2kg of sodium borate, and stir to form a mixture; S2, add 0.01kg of lime to the above mixture In the medium, keep warm at 90°C for 1.5h, mix thoroughly, and evaporate to obtain a powdery composite binder.

[0024] Take the above-mentioned composite binder with different dosages and 3kg of iron concentrate, add water and stew the material for 30 minutes, and put the stuffed material into the disc pelletizer to produce general oxidized pellets according to the same method as the iron concentrate. The rotation speed is 30r / min, the inclination angle is 45°, and the amount of water added is controlled at about 8% of the total weight of the raw materials. When the number and size of the pellets reach a certain level, spray water while feeding to make the pellets gradually grow larger. When the size of the pellets reaches a...

Embodiment 2

[0030] First prepare a new type of composite binder: S1, dissolve 7kg of polyvinyl alcohol in 55kg of hot water at a temperature of 80°C, stir magnetically for 10 minutes to dissolve, add 0.4kg of potassium borate, and stir to form a mixture; S2, add 1kg of lime to the above mixture In the medium, keep warm at 100°C for 1 hour, mix thoroughly, and evaporate to obtain a powdery composite binder.

[0031] Take 0.05 kg of the above-prepared binder, add it to 9.95 kg of iron ore concentrate, and prepare oxidized pellets as in Example 1. The prepared pellets will be tested, and the compressive strength of green pellets can reach 40N, and the compressive strength of roasted pellets can reach 40N. The strength can reach 2708N.

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Abstract

The invention relates to a composite binder for producing oxidized pellets. The composite binder comprises, by weight, 0.003-2 parts of lime, 3-8 parts of polyving akohol, 0.01-0.5 part of borate and25-60 parts of water. By means of the composite binder, the drop strength and compressive strength of fresh pellets can be improved obviously, the burst temperature of the pellets is increased remarkably, and the compressive strength of the roasted pellets is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of smelting, and in particular relates to a composite binder for producing oxidized pellets. Background technique [0002] The reserves of high-grade iron ore and high-quality coking coal have gradually become scarce with the development of the steel industry, and the cost of obtaining high-quality resources has gradually increased. In addition, to achieve high quality, high yield, low consumption, and environmental protection is the only way for the steel industry at present. In the world, there are large reserves of lean ore and broad mining prospects, but lean ore needs to go through pre-processing such as mining, grinding and beneficiation to obtain relatively high-grade iron concentrates. However, this high-grade iron ore The particle size of the concentrate is relatively small, so it cannot be smelted directly in the furnace, and it needs to be smelted to obtain pellets with a suitable size before ent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/242
CPCC22B1/242
Inventor 丁学勇王博居天华唐昭辉董越刘程宏代婧鑫
Owner NORTHEASTERN UNIV
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