Grading technology for cold-pressed pelletizing and shaft furnace magnetization roasting of powdery refractory iron oxide ore

A technology of iron oxide ore and magnetization roasting, applied in the direction of shaft furnace, process efficiency improvement, furnace, etc., can solve problems such as easy sticking to the kiln, difficulty in production, low operation rate, etc., and achieve extensive promotion value and advanced process technology , Good effect of comprehensive indicators

Active Publication Date: 2012-10-24
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the currently used Anshan-type shaft furnace, as a magnetization roasting equipment, can only roast ores with a particle size of 15-100 mm, which limits the utilization of powdered iron oxide ore using a shaft furnace to complete magnetization roasting
In the process of mining and crushing of raw materials, it is inevitable to produce fine ore with a particle size below 15mm. Because of the small particle size, this part of fine ore directly enters the shaft furnace for roasting, which has poor air permeability, poor reduction effect, and is easy to flow into the furnace and smelt. If using a rotary kiln with pulverized coal for roasting, there are also problems such as easy sticking to the kiln, low operation rate, and difficulty in smooth production.
Therefore, how to solve the problem of large-scale industrial reduction roasting of powdery refractory iron oxide ore, so far in China, there is no relevant technical report

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033]According to the weight ratio of 2:1, take clay and industrial magnesium chloride respectively, mix and stir evenly, and make a combined binder; crush the powdery refractory iron oxide ore with a particle size of 3 The mine trough on the top of the double-layer combustion chamber shaft furnace enters the furnace by its own weight, passes through the preheating zone, and after 1.5 hours of roasting in the heating zone, enters the reduction zone, where it is heated with high-coke mixed gas for 4 hours at a temperature of 550 ° C. Reduction reaction, the weak magnetic iron minerals are reduced to strong magnetic magnetite minerals, and then discharged from the furnace bottom discharge roller, cooled by the sealed water-sealed pool, and then moved out by the two side unloading machines; transported to the grinding and sorting system , complete grinding and weak magnetic separation.

Embodiment 2

[0035] According to the weight ratio of 3:1, take bentonite and industrial magnesium chloride respectively, mix and stir evenly, and make a combined binder; crush the powdery refractory iron oxide ore with a particle size of 3 The ore trough on the top of the double-layer combustion chamber shaft furnace enters the furnace by its own weight, passes through the preheating zone, and after 2 hours of roasting in the heating zone, enters the reduction zone, where it is heated with high-coke mixed gas for 5 hours at a temperature of 550 ° C. Reduction reaction, the weak magnetic iron minerals are reduced to strong magnetic magnetite minerals, and then discharged from the furnace bottom discharge roller, cooled by the sealed water-sealed pool, and then moved out by the two side unloading machines; transported to the grinding and sorting system , complete grinding and weak magnetic separation.

Embodiment 3

[0037] According to the weight ratio of 2.5:1, take bentonite and industrial magnesium chloride respectively, mix and stir evenly, and make a combined binder; crush the powdery refractory iron oxide ore with a particle size of 3 The ore trough on the top of the double-layer combustion chamber shaft furnace enters the furnace by its own weight, passes through the preheating zone, and after 1.75 hours of roasting in the heating zone, enters the reduction zone, where it takes place with high-coke mixed gas for 4.5 hours at a temperature of 600 ° C. Reduction reaction, the weak magnetic iron minerals are reduced to strong magnetic magnetite minerals, and then discharged from the furnace bottom discharge roller, cooled by the sealed water-sealed pool, and then moved out by the two side unloading machines; transported to the grinding and sorting system , complete grinding and weak magnetic separation.

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Abstract

A grading technology for cold-pressed pelletizing and shaft furnace magnetization roasting of powdery refractory iron oxide ore comprises the following steps: 1, preparing a combined binder through using clay or bentonite, and industrial magnesium chloride; 2, fragmenting the powdery refractory iron oxide ore, mixing with the combined binder to prepare cold-pressed balls, and sieving; or grinding the powdery refractory iron oxide ore, grading through a strong magnetic process, dehydrating, mixing with the combined binder to prepare the cold-pressed balls, and sieving; or carrying out strong magnetic selection to produce ore tailings, enriching through an ore selection process, dehydrating, mixing with the combined binder to prepare the cold-pressed balls, and sieving; 3, drying materials which cannot pass through a sieve, sieving the dried materials, returning materials which pass through the sieve to a pelletizing operation, sending balls which cannot pass through the sieve to a double combustion chamber shaft furnace to undergo a reduction reaction, cooling, and completing ore grinding and weak magnetic grading through an ore grinding and grading system. According to the technology, a large amount of idle or abandoned low-grade powdery iron oxide ore is recycled, the particle size range of ore roasted in the shaft furnace is enlarged, the shaft furnace magnetization roasting of the powdery refractory iron oxide ore is realized, and the shaft furnace is maximally utilized to complete the ore roasting.

Description

technical field [0001] The invention belongs to the technical field of ore dressing, and relates to a process for separating powdery refractory iron oxide ore by using shaft furnace magnetization roasting, in particular to a kind of powdery refractory iron oxide ore cold-pressed ball agglomeration, shaft furnace magnetization roasting sorting craft. Background technique [0002] Lean ore reserves in my country's iron ore resources account for about 90% of the total reserves, and most of them are complex and refractory iron oxide ores. Usually, complex refractory iron oxide ore is separated by strong magnetic separation process. Due to the fine-grained distribution of complex refractory iron oxide ore minerals, fine grinding is required, and the recovery of fine-grained iron minerals by strong magnetic separation equipment is very limited, so there are disadvantages of low iron grade and low recovery rate in concentrate. If the shaft furnace magnetization roasting-weak magn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B1/214C22B1/00C22B1/243B07B15/00B03C1/00
CPCY02P10/20
Inventor 姜华王彩虹
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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