A reduction dezincification method for zinc-containing dust

A technology of dust and dezincification, which is applied to the improvement of process efficiency, furnace, furnace type, etc., can solve the problems of low zinc grade of sub-zinc oxide products, low hydrophilicity of zinc-containing dust, and influence on process economy, etc., to eliminate The effect of reducing the hidden danger of loop formation, shortening the recovery time, and improving the recovery rate

Active Publication Date: 2021-06-08
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the low hydrophilicity and poor ball forming ability of zinc-containing dust, conventional bentonite is mostly used as binder when making pellets. Although it has been pretreated by moistening and grinding, the amount of binder is still high and the strength of green pellets is poor. During the reduction process, the pellets are easily broken and pulverized, which not only leads to the formation of rings in the rotary kiln, but also the obtained iron-containing products are mainly powdery and fine-grained. Blast furnace ironmaking, resulting in a lot of energy waste
In addition, due to the existence of a large amount of fine powder in the reduction process, part of the fine powder enters the flue dust, resulting in low grade zinc in the secondary zinc oxide product recovered from the flue gas of the rotary kiln, which directly affects the economics of the process
The above shortcomings lead to the fact that iron and steel plants basically do not use this process for dezincification of zinc-containing dust

Method used

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  • A reduction dezincification method for zinc-containing dust

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Embodiment 1

[0059] Aiming at the existing problems, the present invention provides a method for reductive dezincification of zinc-containing dust, comprising the following steps:

[0060] (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;

[0061] (2) adding the carbon-containing dedusting ash from the coke oven to the mixed dust prepared in the step (1) to obtain a mixture, the mass ratio of carbon and iron of the mixture is 0.25;

[0062] (3) 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 is stored and Cover the material and mature for 20 minutes, and the temperature of the material will rise by about 15°C;

[0063] (4) Add 1% composite binder to the mixture and mix evenly to obtain a mixture. The composite binder in...

Embodiment 2

[0070] Aiming at the existing problems, the present invention provides a method for reductive dezincification of zinc-containing dust, comprising the following steps:

[0071] (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;

[0072] (2) adding finely ground bituminous coal (for changing the amount of internal carbon) 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;

[0073] (3) add water to the mixture prepared in the step (2) for 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 is stored and Cover the material and mature for 30 minutes, and the temperature of the mixture will rise by about 20°C;

[0074] (4) Add 0.6% composite binder in the cured mixture and mix uniformly to obt...

Embodiment 3

[0084] Aiming at the existing problems, the present invention provides a method for reductive dezincification of zinc-containing dust, comprising the following steps:

[0085] (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;

[0086] (2) adding the carbon-containing dedusting ash from the coke oven to the zinc-containing dust prepared in the step (1) to obtain a mixture, so that the carbon and iron mass ratio of the mixture are 0.25;

[0087] (3) add water to the mixture prepared in the step (2) for wetting, the addition of the water accounts for 12% of the total weight of the mixture, and the wetting time is 10min, then the mixture is stored and Cover the material and mature for 30 minutes, and the temperature of the mixture will rise by about 20°C;

[0088] (4) Add 0.8% composite binder to the mixture and mix evenly to obtain a mixture. The composite bi...

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Abstract

The invention provides a method for reductive dezincification of zinc-containing dust, comprising steps: S1, batching: preparing zinc-containing dust materials; S2, pretreatment: adding water to the materials for wetting, storing and covering the materials after wetting heating and aging; S3, adding 0.6% to 1.0% composite binder to the cured material to obtain a mixed material; S4, pelleting the mixed material prepared in the step S3 to obtain green balls; S5, mixing The raw balls are dried to obtain dry balls; S6. Put the dry balls into a rotary kiln for reduction, and after reduction, cool under a protective atmosphere to obtain reduced and dezincified balls. Improve the spheroidization of zinc-containing dust pellets, so that the pellets are not easy to pulverize and break, reduce dezincification and dealkali metals in the rotary kiln, the dezincification rate is greater than 92.5%, and the residual zinc content of the reduced pellets is low At 0.092%, the iron metallization rate of the reduced pellets is greater than 82%, and the alkali metal Na 2 O, K 2 The removal rate of O is greater than 50%.

Description

technical field [0001] The invention relates to the field of solid waste treatment of metallurgical dust, in particular to a reduction dezincification method for zinc-containing dust Background technique [0002] With the development of my country's iron and steel industry, the demand for iron ore is also increasing day by day. At the same time, with the increasing amount of dust produced in the steel production process, these dusts containing a large amount of useful elements such as iron, zinc, and carbon have a relatively large output, accounting for 8 to 15% of steel output, and are a large Use secondary resources of value. However, zinc dust is a hazardous solid waste. Therefore, the development of a suitable process to recycle the useful elements in these dusts will not only help alleviate the pressure of my country's iron ore shortage, reduce the dependence of my country's iron ore on foreign countries, but also solve the problem of environmental pollution caused by...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/242C22B7/02C22B1/216C22B19/02C22B19/30
CPCC22B1/216C22B1/2406C22B1/242C22B7/02C22B19/02C22B19/30Y02P10/20
Inventor 朱德庆潘建郭正启李启厚杨聪聪
Owner CENT SOUTH UNIV
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