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Preparation method of zinc-containing dust pellet

A technology for dust and pellets, applied in the field of preparation of zinc-containing dust pellets, can solve the problems of easy breakage, inappropriateness, and pulverization of pellets, and achieves improved hydrophilic properties, improved spheroidization, and good cohesion. Effect

Active Publication Date: 2019-10-11
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The patent uses flux and a single organic binder in the pelletizing process, and the addition amount is relatively high, 1 to 5%.
[0004] From the review, it can be seen that in the current pelletizing process of zinc-containing dust, there are common problems such as large amount of binder, single binder, no pretreatment process or inappropriate pretreatment process for raw materials, poor strength of prepared pellets, and reduction after entering the kiln. During the process, the pellets are easy to break and pulverize, and the obtained iron-containing products are mainly powdery or the strength is too poor, so they cannot be directly smelted in the blast furnace, but can only be returned to the blast furnace for sintering and smelting, which seriously affects the dezincification process. stable operation, dezincification rate and whereabouts of reduced products

Method used

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  • Preparation method of zinc-containing dust pellet

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Aiming at the existing problems, the present invention provides a method for preparing zinc-containing dust pellets, comprising the following steps:

[0048] (1) Ingredients: mix blast furnace bag ash, steel-making ladle furnace ash and steel-making converter soot in a weight ratio of 32.42%: 63.46%: 4.12% to obtain mixed dust;

[0049] (2) adding the carbon-containing dedusting ash from the coke oven to the mixed dust prepared in the step (1) to obtain an admixture, the mass ratio of carbon and iron of the admixture is 0.25;

[0050] (3) Pretreatment: add water to the mixture prepared in the step (2) and carry out wetting, the addition of the water accounts for 10% of the total weight of the mixture, and the wetting time is 10min, then the mixture Stockpile and cover the material for 20 minutes of aging, and the temperature of the mixture will rise by about 15°C;

[0051] (4) Add 1% composite binder to the mixture and mix evenly to obtain a mixture. The composite bind...

Embodiment 2

[0060] Aiming at the existing problems, the present invention provides a method for preparing zinc-containing dust pellets, comprising the following steps:

[0061] (1) Ingredients: mix blast furnace bag ash, steelmaking ladle ash and steelmaking converter dust in a weight ratio of 32.42%: 63.46%: 4.12% to obtain zinc-containing dust;

[0062] (2) adding finely ground bituminous coal to the zinc-containing dust prepared in the step (1) to obtain a mixture, so that the mass ratio of carbon and iron of the mixture is 0.25;

[0063] (3) Pretreatment: add water to the mixture prepared in the step (2) and carry out wetting, the addition of the water accounts for 12% of the total weight of the mixture, and the wetting time is 20min, then the mixture Stockpile and cover the material for 30 minutes of aging, and the temperature of the mixture will rise by about 20°C;

[0064] (4) Add 0.6% composite binder to the mixture after step ripening and mix uniformly to obtain a mixture, the c...

Embodiment 3

[0074] Aiming at the existing problems, the present invention provides a method for preparing zinc-containing dust pellets, comprising the following steps:

[0075] (1) Ingredients: mix blast furnace bag ash, steelmaking ladle ash and steelmaking converter dust in a weight ratio of 32.42%: 63.46%: 4.12% to obtain zinc-containing dust;

[0076] (2) Add the carbon-containing dedusting ash from the coke oven to the zinc-containing dust prepared in the step (1)

[0077] Obtain compound, make the carbon of described compound, the mass ratio of iron be 0.25;

[0078] (3) Pretreatment: add water to the mixture prepared in the step (2) and carry out wetting, the addition of the water accounts for 13% of the total weight of the mixture, and the wetting time is 10min, then the mixture Stockpile and cover the material for 30 minutes to make the temperature of the mixture rise by about 20°C;

[0079] (4) Add 0.8% composite binder to the mixture and mix evenly to obtain a mixture. The co...

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Abstract

The invention provides a preparation method of a zinc-containing dust pellet. The preparation method comprises the following steps of S1, carrying out burdening , mixing the blast furnace cloth bag ash, the steel-making ladle furnace ash, the steel-making converter smoke dust and other zinc-containing dust with the carbon-containing fine powder to obtain a mixture; S2, carrying out pretreatment, adding water into the mixture obtained in the step S1 for wetting, and piling up and curing after wetting; S3, adding a composite binder into the cured mixture, and carrying out uniformly mixing to obtain a uniform mixture; S4, carrying out pelletizing on the uniformly mixed material prepared in the step S3 to obtain a green pellet; and S5, drying the green pellet in the step S4 to obtain the zinc-containing dust dry pellet. The dry pellet has the advantages of high compressive strength and good reducibility, the metallization rate is high in the direct reduction process, the dezincification effect is good, and the preparation method solves the technical problems that an existing zinc-containing dust pellet is easy to break and pulverize in the reduction process.

Description

technical field [0001] The invention relates to the field of iron and steel metallurgy, in particular to a method for preparing zinc-containing dust pellets. Background technique [0002] The amount of dust produced in the steel production process generally accounts for 8-15% of the steel output, and is rich in iron, zinc, carbon and other elements, and is a secondary resource with great utilization value. However, zinc dust is a hazardous solid waste. Therefore, the development of a suitable process to recycle these dusts will not only help to improve resource utilization, but also solve the environmental pollution problems caused by dust in iron and steel enterprises. [0003] The main processes for dezincification of zinc-containing dust by pyrolysis include rotary kiln reduction process and rotary hearth furnace reduction process, and the important process is the preparation of zinc-containing dust pellets. The quality of pellets directly affects the effect of dezincif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/242C22B7/02C22B1/216C22B19/02C22B19/30
CPCC22B1/216C22B1/2406C22B1/242C22B7/02C22B19/02C22B19/30Y02P10/20
Inventor 朱德庆郭正启潘建李启厚王定政杨聪聪李紫云
Owner CENT SOUTH UNIV
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