Microwave continuous suspension roasting method of enhancing high-phosphorus oolitic hematite for iron increase and phosphorus reduction

A technology of oolitic hematite and suspension roasting, which is applied in the field of mineral processing, can solve the problems of insignificant separation indicators of high-phosphorus oolitic hematite, achieve a significant effect of increasing iron and reducing phosphorus, and realize resource utilization and high efficiency , to achieve the effect of development and utilization

Active Publication Date: 2019-11-01
NORTHEASTERN UNIV
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  • Abstract
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Problems solved by technology

[0004] Aiming at the above-mentioned technical problems such as the inconspicuous separation index of the existing high-phosphorus oolitic hematite, the present invention provides a microwave continuous suspension roasting method for strengthening the iron and phosphorus reduction of high-phosphorus oolitic hematite. After microwave pretreatment and heat storage, the roasted ore is obtained by suspension magnetization roasting, and then iron concentrate is obtained after ore grinding and weak magnetic separation, and the iron concentrate is obtained after acid leaching to obtain phosphorus iron concentrate

Method used

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  • Microwave continuous suspension roasting method of enhancing high-phosphorus oolitic hematite for iron increase and phosphorus reduction

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] 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;

[0057] 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

[0083] System structure is the same as embodiment 1, and the difference is:

[0084] (1) The gas in the first gas storage tank is CO 2 ; The gas in the second gas storage tank is CO 2 , N in the gas in the third gas storage tank 2 The volume percentage is 20%, and the rest is H 2 ;

[0085] (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 2 is 1:1; the reduction feed chamber and the reduction discharge chamber The volume ratio is 1:5, and the height ratio between the reduction baffle and the reduction fluidizer 17 is 1:1;

[0086] Method is with embodiment 1, and difference is:

[0087] (1) Particle size of iron ore powder ≤ 0.074mm accounts for 70% of the total mass;

[0088] (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 po...

Embodiment 3

[0094] System structure is the same as embodiment 1, and the difference is:

[0095] (1) N in the gas in the third gas storage tank 2 The volume percentage is 30%, the rest is CH 4 ;

[0096] (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;

[0097] Method is with embodiment 1, and difference is:

[0098] (1) Particle size of iron ore powder ≤ 0.074mm accounts for 90% of the total mass;

[0099] (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 7m 3 / kg, the volume ratio of the protective gas passing i...

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Abstract

The invention discloses a microwave continuous suspension roasting method of enhancing high-phosphorus oolitic hematite foriron increase and phosphorus reduction. The microwave continuous suspension roasting method adopts a microwave continuous suspension roasting system and comprises the following steps that (1) the high-phosphorus oolitic hematite is crushed and finely ground into iron ore powder, and then the iron ore powder is poured into a feeding bin and is conveyed to a pretreatment fluidization device; (2) protective gas is introduced into a pretreatment feeding chamber and a pretreatment discharging chamber; (3) the iron ore powder is heated througha microwave cavity and then enters a reduction fluidization chamber; (4) the protective gas is introduced into a reduction feeding chamber and a reduction discharging chamber, and when thetemperature is lowered to 450-700 DEG C, reducing mixed gas is introduced into the reduction discharging chamber for reduction magnetization roasting, and a reduction material enters a cooler; and (5) the reduction material is cooled to thetemperature below 100 DEG C and enters a collection tank. By adopting the method disclosed by the invention, efficient and comprehensive utilization of high-phosphorus iron ores is realized, the iron grade and the recovery rate are high, and the phosphorus removal effect is remarkable; and resource and efficient development and utilization of the high-phosphorus oolitic hematite are realized.

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 high-phosphorus oolitic hematite to increase iron and reduce phosphorus. Background technique [0002] The total amount of iron ore in my country is large, but a large number of "poor, fine, miscellaneous" weak magnetic iron ore resources have not been effectively developed and utilized. Among them, oolitic hematite resources have reserves of more than 10 billion tons, accounting for about 100 million tons of domestic iron ore. 12% of the total resource reserves, accounting for 30% of my country's hematite reserves; oolitic hematite is mainly composed of oolitic grains, and oolitic grains are composed of many oolitic nuclei and oolitic bodies; the minerals in the ore are tightly embedded , with hematite (or quartz, clay minerals) as the core, hematite, quartz, and chlorite are wrapped and con...

Claims

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Application Information

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Patent Type & Authority Applications(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
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