Method for producing metallized pellets through iron mine tailings

A technology for metallizing pellets and iron ore tailings is applied in the field of comprehensive utilization of resources to achieve the effects of improving resource utilization efficiency, improving pelletizing performance and reducing production costs

Active Publication Date: 2017-05-31
INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for producing metallized pellets us

Method used

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  • Method for producing metallized pellets through iron mine tailings

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Embodiment 1

[0028] The iron ore tailings are crushed and dispersed by a powder depolymerization and dispersing machine, and the particle size of the iron ore tailings after disintegration is ≤100 μm; the electric furnace ash, blast furnace trough dedusting ash, blast furnace casting house dedusting ash, and blast furnace sludge Mix with converter sludge at a ratio of 15:30:20:30:5 to obtain iron-containing dust-sludge mixture. The content of TFe in the mixture is 44.25%, the content of C is 13.90%, and C / O=1.0. The dryer dries the iron-containing dust and mud; mix the iron ore tailings and the iron-containing dust and mud mixture at a ratio of 10:90, add 4% bentonite, add water, fully mix with a strong mixer, and pass through the circular The disc pelletizer produces green pellets with a particle size of 10-16mm and a moisture content of 15%. The pellets are sent to the grate machine and dried at 500°C for 40 minutes to obtain dry pellets, which are then passed through a rotary kiln or Th...

Embodiment 2

[0030] The iron ore tailings are crushed and dispersed by a powder depolymerization and dispersing machine, and the particle size of the iron ore tailings after disintegration is ≤100 μm; the electric furnace ash, blast furnace trough dedusting ash, blast furnace casting house dedusting ash, and blast furnace sludge Mix with converter sludge at a ratio of 10:40:10:30:10 to obtain iron-containing dust-sludge mixture. The content of TFe in the mixture is 44.71%, the content of C is 15.88%, and C / O=1.15. The dryer dries the iron-containing dust and sludge; mix the iron ore tailings and the iron-containing dust and sludge mixture in a ratio of 30:70, add 1% bentonite and 5% coking dust, add water, and use strong mixing The machine is fully mixed, and the disc pelletizer is used to make green pellets with a particle size of 10-16mm. The water content of the pellets is 13%. The balls are then preheated and reduced at high temperature through a rotary kiln or a rotary hearth furnace....

Embodiment 3

[0032] The iron ore tailings are crushed and dispersed by a powder depolymerization and dispersing machine, and the particle size of the iron ore tailings after disintegration is ≤100 μm; the electric furnace ash, blast furnace trough dedusting ash, blast furnace casting house dedusting ash, and blast furnace sludge Mix with converter sludge at a ratio of 10:40:10:30:10 to obtain iron-containing dust-sludge mixture. The content of TFe in the mixture is 44.71%, the content of C is 15.88%, and C / O=1.15. The dryer dries the iron-containing dust and sludge; mix the iron ore tailings and the iron-containing dust and sludge mixture at a ratio of 30:70, add 1% bentonite and 4.5% coal powder, add water, and use a strong mixer Mix well, and use a disc pelletizer to make green pellets with a particle size of 10-16mm. The water content of the raw pellets is 13%. The pellets are sent to the grate machine and dried at 400°C for 30 minutes to obtain dry pellets. , and then preheat and high-...

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Abstract

The invention relates to a method for producing metallized pellets through iron mine tailings. The method mainly comprises the following technology steps that a powder depolymerization and scattering machine is adopted for crushing and scattering the caked iron mine tailings; the iron mine tailings and dried iron containing dust mud are mixed according to the proportion of 1:9-3:7; 1-4% of bentonite and 0-5% of coked dust removing ash or pulverized coal are prepared in the mixture in the second step, and sufficient uniform mixing is conducted through a powerful mixing machine; a certain proportion of water is added in the mixture, and 10-16 mm of green pellets are manufactured through a disc pelletizing machine; after being dried through a chain grating machine, the green pellets are conveyed to a rotary kiln or a rotary hearth furnace to be preheated and roasted at the high temperature, and metalized pellet products are finally obtained and serve as high-quality raw materials for blast furnace iron making or electric furnace steel making. According to the method, the iron mine tailing resource hard to treat is comprehensively utilized, meanwhile, the production cost of the iron containing dust mud metalized pellets is reduced, and very obvious economic benefits and environment benefits are achieved.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of resources and relates to a method for producing metallized pellets from iron ore tailings. Background technique [0002] With the development of the economy, the demand for mineral products has increased significantly, the scale of mining development has increased accordingly, and the number of beneficiation tailings produced will continue to increase; in addition, the grade of many available metal ores is decreasing day by day. In order to meet the growing demand for mineral products In order to increase the demand, the grade of ore must be improved through mineral processing, so the scale of mineral processing is getting larger and larger, and the number of mineral processing tailings is also greatly increased. The amount of tailings discharged by countries in the world is about 5 billion tons per year, while the annual discharge of tailings in China is more than 150 million tons. At ...

Claims

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Application Information

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IPC IPC(8): C22B1/243C21B13/10C21B13/08
CPCC21B13/08C21B13/105C22B1/2406C22B1/243
Inventor 毛瑞杜屏任立群
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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