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Microwave Continuous Suspension Roasting Method for Enhancing Dissociation of Complex Refractory Iron Ore

A suspension roasting and iron ore technology, applied in the field of mineral processing, to achieve the effect of improving the level of device automation and intelligence, realizing development and utilization, and achieving significant sorting effects

Active Publication Date: 2021-04-13
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Many experts and scholars have carried out a lot of basic research on microwave roasting. The main research directions are concentrated on mineral microwave pretreatment, mineral absorbing characteristics, mineral static carbon thermal reduction microwave roasting, etc. There is little research on microwave roasting in a fluidized state. , according to the current research status of using the suspension roasting-magnetic separation process to efficiently develop and utilize complex refractory iron ores, how to better achieve the improvement of mineral monomer dissociation and grindability, separation indicators and energy saving and consumption reduction, based on this Above all, improving the level of equipment automation and intelligence will be the focus and difficulty of future research

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  • Microwave Continuous Suspension Roasting Method for Enhancing Dissociation of Complex Refractory Iron Ore

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] The structure of the microwave continuous suspension roasting system is as follows: figure 1 As shown, it includes feeding bin 1, pretreatment fluidizer 2, microwave cavity 8, microwave generating device 5, reduction fluidizer 17, cooler 18 and collection tank 19;

[0055] The discharge port at the bottom of the feeding bin 1 is connected with the feed port of the pretreatment fluidizer 2, and the pretreatment fluidizer 2 is provided with a microwave cavity 8 outside, and a pretreatment baffle is arranged inside the pretreatment fluidizer 2 The interior is divided into a pretreatment feed chamber and a pretreatment discharge chamber. The top edge of the pretreatment baffle is connected to the top plate of the pretreatment fluidizer 2, and the two sides of the pretreatment baffle are connected to the pretreatment fluidizer 2. The side wall is connected, and the gap between the bottom edge of the pretreatment baffle and the bottom plate of the pretreatment fluidizer 2 is ...

Embodiment 2

[0081] System structure is the same as embodiment 1, and the difference is:

[0082] (1) The gas in the first gas storage tank is CO 2 ; The gas in the second gas storage tank is CO 2 , the gas in the third gas storage tank is H 2 ;

[0083](2) The volume ratio of the pretreatment feed chamber to the pretreatment discharge chamber is 1:5, the height ratio of the pretreatment baffle to the pretreatment fluidizer is 1:1; the reduction feed chamber to the reduction discharge chamber The volume ratio is 1:5, and the height ratio of the reduction baffle to the reduction fluidizer is 1:1;

[0084] Method is with embodiment 1, and difference is:

[0085] (1) Particle size ≤ 0.074mm in the iron ore powder accounts for 70% of the total mass, and the iron grade of the iron ore is 15.1%;

[0086] (2) The ratio of the total volume of protective gas passing into the pretreatment feed chamber and the pretreatment discharge chamber per unit time to the mass of iron ore powder passing in...

Embodiment 3

[0091] System structure is the same as embodiment 1, and the difference is:

[0092] (1) The gas in the third gas storage tank is CH 4 ;

[0093] (2) The volume ratio of the pretreatment feed chamber to the pretreatment discharge chamber is 1:8, the height ratio of the pretreatment baffle to the pretreatment fluidizer is 1:1.5; the reduction feed chamber to the reduction discharge chamber The volume ratio is 1:8, and the height ratio of the reduction baffle to the reduction fluidizer is 1:1.5;

[0094] Method is with embodiment 1, and difference is:

[0095] (1) Particle size ≤ 0.074mm in the iron ore powder accounts for 90% of the total mass, and the iron grade of the iron ore is 29.6%;

[0096] (2) The ratio of the total volume of protective gas passing into the pretreatment feed chamber and the pretreatment discharge chamber per unit time to the mass of iron ore powder passing into the pretreatment feed chamber is 7.5m 3 / kg, wherein the volume ratio of the protective g...

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Abstract

A microwave continuous suspension roasting method that strengthens the dissociation of complex refractory iron ores, adopts a microwave continuous suspension roasting system, and performs the following steps: (1) Crushing and grinding complex refractory iron ores into a feed bin, transporting to the pretreatment fluidizer; (2) feed protective gas into the pretreatment feed chamber and the pretreatment discharge chamber to keep the iron ore powder in a fluidized state; (3) turn on the microwave generating device and heat it through the microwave cavity , and then enter the reduction fluidizer; (4) feed protective gas into the reduction feed chamber and the reduction discharge chamber respectively; Enter the cooler; (5) enter the collection tank after cooling down to below 100°C. The method of the invention can significantly improve the dissociation degree and grindability of mineral monomers, and realize the resourceful and efficient development and utilization of complex refractory iron ores.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to a microwave continuous suspension roasting method for strengthening dissociation of complex refractory iron ore. Background technique [0002] In recent years, the rapid development of my country's iron and steel industry has greatly promoted the demand for iron ore. my country's iron ore resource reserves are abundant. At the end of 2017, my country's iron ore resource reserves were ascertained to be 84.888 billion tons; The characteristics of low iron ore, fine crystal grain size, and complex mineral composition have resulted in a large number of iron ore resources not being effectively developed and utilized, which has forced the iron and steel industry to rely on imports; in 2017, my country imported 1.075 billion tons of iron ore, an increase of 7.5%. The dependence on foreign countries exceeds 86%. With the change of the international iron ore supply an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/10
CPCC22B1/10
Inventor 孙永升周文涛韩跃新李艳军高鹏袁帅
Owner NORTHEASTERN UNIV LIAONING