Method for preparing mixed iron powder cold-pressing pellets

A technology for cold-pressed pellets and mixed iron, which is applied in the field of preparation of mixed iron powder cold-pressed pellets, can solve the problems of many harmful impurities, high energy consumption, and coarse particle size of pellets, so as to reduce environmental pollution and reduce environmental pollution. Good effect of resource utilization and metallurgical properties

Inactive Publication Date: 2016-01-06
LANZHOU UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there is still a big gap between the quality of my country's pellets and the international advanced level, which affects the development of the iron and steel industry. The gap is mainly manifested in: (1) The pellets have coarse particle size, low iron grade, and many harmful impurities
(2) The amount of bentonite is large. Domestic pellet production mainly uses bentonite as the pellet binder, and adopts a high-temperature drying and curing process for raw pellets; resulting in lower iron grade and higher energy consumption, which is not conducive to pellet production and blast furnace smelting
(3) The finished ball has low strength and poor uniformity
(4) High iron powder rate and low ball forming efficiency
Moreover, its quality and quantity cannot meet the needs of production, and about 20 million tons of high-quality pellets need to be imported every year

Method used

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  • Method for preparing mixed iron powder cold-pressing pellets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] ①Remove the visible impurities, stones, sawdust, and plastics in the iron ore powder and iron oxide scale powder, and then dry them to make the water content 5%; and control the particle size of the iron ore powder and iron oxide scale powder to 100 mesh;

[0018] ② Weigh 700g of iron ore powder and 300g of iron oxide scale powder, stir and mix for 20 minutes at a stirring speed of 150r / min, and mix evenly to obtain mixed iron powder;

[0019] ③Prepare binder, weigh 15g of bentonite, 3.5g of rapid-hardening portland cement, 1.5g of rapid-hardening sulfoaluminate cement, 3g of sodium carboxymethyl starch, 1g of polyacrylamide, 6g of pregelatinized starch, powdered coal 2g of ash, 1g of magnesium oxide, 1g of calcium carbonate, 1g of gypsum and 1g of cement superplasticizer, stir and mix evenly to obtain a binder;

[0020] ④ Add 1000g of the above-mentioned mixed iron powder, 36g of binder, and 80g of water in sequence in the mixing device with mechanical stirring, stir r...

Embodiment 2

[0023] ①Remove the visible impurities, stones, sawdust and plastics in the iron ore powder and iron oxide scale powder, and then dry them to make the water content 3%; and control the particle size of the iron ore powder and iron oxide scale powder to 120 mesh;

[0024] ② Weigh 700g of iron ore powder and 300g of iron oxide scale powder, stir and mix for 20 minutes at a stirring speed of 150r / min, and mix evenly to obtain mixed iron powder;

[0025] ③Prepare binder, weigh 15g of bentonite, 3.5g of rapid-hardening portland cement, 1.5g of rapid-hardening sulfoaluminate cement, 3g of sodium carboxymethyl starch, 1g of polyacrylamide, 6g of pregelatinized starch, powdered coal 2g of ash, 1g of magnesium oxide, 1g of calcium carbonate, 1g of gypsum and 1g of cement superplasticizer, stir and mix evenly to obtain a binder;

[0026] ④ Add 1000g of the above-mentioned mixed iron powder, 36g of binder, and 60g of water in sequence in a mixing device with mechanical stirring, and stir ...

Embodiment 3

[0029] ①Remove the visible impurities, stones, sawdust, and plastics in the iron ore powder and iron oxide scale powder, and then dry them to make the water content 1%; and control the particle size of the iron ore powder and iron oxide scale powder to 110 mesh;

[0030] ② Weigh 700g of iron ore powder and 300g of iron oxide scale powder, stir and mix for 20 minutes at a stirring speed of 150r / min, and mix evenly to obtain mixed iron powder;

[0031] ③Prepare binder, weigh 15g of bentonite, 3.5g of rapid-hardening portland cement, 1.5g of rapid-hardening sulfoaluminate cement, 3g of sodium carboxymethyl starch, 1g of polyacrylamide, 6g of pregelatinized starch, powdered coal 2g of ash, 1g of magnesium oxide, 1g of calcium carbonate, 1g of gypsum and 1g of cement superplasticizer, stir and mix evenly to obtain a binder;

[0032] ④ Add 1000g of the above-mentioned mixed iron powder, 35g of binder, and 60g of water in sequence in a mixing device with mechanical stirring, and stir...

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Abstract

The invention discloses a method for preparing mixed iron powder cold-pressing pellets, belonging to the technical field of metallurgical pellet smelting. The method comprises the following steps: applying a formulated composite binder to compression moulding of mixed iron powder, wherein the proportion of the mixed iron powder is that iron ore powder: scale powder is 70:30; the material proportion in the process of compression moulding is that mixed iron powder: composite binder: water is 100:3.5-3.6:6-8. The method adopts a cold-pressing pelletizing process to prepare the iron power pellets meeting the use requirements, and all the performance indexes of the strength and the cracking temperature of green pellet and the compression strength of finished pellet of the pellets meet the quality requirements of the pellets. The technical problem of iron powder cold-pressing moulding puzzling iron and steel enterprises for a long term is solved. The method can fully utilize the current iron-containing waste in the iron and steel enterprises, solves the residue problem of the iron-containing waste, and achieves the purposes of reasonably utilizing resources and reducing environmental pollution. The method can be suitable for industrial production and has good economic, social and environmental benefits.

Description

technical field [0001] The invention relates to the technical field of metallurgical pellet smelting, in particular to a preparation method of mixed iron powder cold-pressed pellets. technical background [0002] With the improvement of my country's understanding of fine materials and reasonable furnace charge structure, the technical and economic indicators of ironmaking have been continuously optimized, and pellets have gradually been favored and highly valued by enterprises, and the demand for pellets is strong. As far as iron ore powder resources are concerned, from a global perspective, natural rich ore is increasingly in short supply, and the world's demand for steel is increasing, so we must do our best to extract iron from lean ore. This kind of ore must be finely ground and selected to form agglomerates before it can be smelted in a furnace. The pelletizing process is an effective way to formally solve the agglomeration of finely ground concentrates. Now the pellet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/242C22B1/248
Inventor 石赟罗亮
Owner LANZHOU UNIVERSITY
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