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High-phosphorus hematite-limonite ore fluidized roasting system and method

A fluidized roasting and hematite technology, applied in the fields of metallurgy and mineral processing, to achieve the effects of high acid leaching removal rate, reduction of high temperature load, and optimization of energy balance

Active Publication Date: 2020-04-24
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing patented systems and methods basically focus on solving the problem of refractory selection of low-grade iron ore, and seldom focus on the process and method of phosphorus reduction for high-phosphorus minerals

Method used

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  • High-phosphorus hematite-limonite ore fluidized roasting system and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Such as figure 1 As shown, a high-phosphorus hematite fluidized roasting system includes a feed bin, a preheater, a fluidized oxidation roaster, an oxidation cooler, a burner, a fluidized magnetized roaster, and reducing gas cooling Generator, air cooler and discharge bin,

[0038] The preheater includes a multi-stage preheating cyclone and a bag filter 3, the fluidized oxidation roaster includes an oxidation roaster body 5 and an oxidation cyclone 6, and the oxidation cooler includes a two-stage oxidation cooling cyclone. And an oxidation discharge valve 9, the fluidized magnetized roaster includes a magnetized roaster body 10 and a magnetized cyclone separator 11, and the reducing gas cooler includes a two-stage reducing gas cooling cyclone and a cooling discharge valve 14. The air cooler includes a two-stage air cooling cyclone, of which,

[0039] The discharge port of the feed bin 1 is connected with the air inlet of the first-stage preheating cyclone 2, the top air ou...

Embodiment 2

[0054] The method for fluidized roasting of high-phosphorus hematite using the above-mentioned fluidized roasting system for high-phosphorus hematite is as follows:

[0055] The high-phosphorus hematite is stored in the feed bin and enters the preheater. In the multi-stage preheating cyclone, the ore powder and the fluidized oxidation roaster hot flue gas tail gas conduct gas-solid countercurrent heat exchange and increase the temperature. The heated hot ore The powder enters the body of the oxidation roaster, and undergoes phase modification of the phosphorus element under the condition of hot flue gas. The oxidized ore powder entrained by the airflow is gas-solid separated by the oxidation cyclone and then returned to the body of the oxidized roaster. The discharge port of the main body is discharged into the oxidation cooler. In the multi-stage oxidation cooling cyclone, the oxidized ore powder and room temperature cold air are cooled by gas-solid countercurrent cooling. The co...

Embodiment 3

[0058] The invention is used to process high-phosphorus hematite powder with an iron grade TFe of 47.7% and a phosphorus of 0.81%, with a particle size of 0.037-2mm, of which -0.074mm accounts for 50%. Hematite phase Fe 2 O 3 exist.

[0059] First, the fine ore enters the two-stage cyclone preheater from the silo to exchange heat with the tail gas of the oxidation furnace, and then enters the fluidized bed oxidation roaster at a temperature of 900 ℃ and the hot flue gas produced by the burner for 30 minutes. In the fluidized bed oxidation roaster, the phosphorus in the iron ore crystals reacts with the alkaline oxides in the minerals to form phosphorus oxides that are easily soluble in acid. After cooling by a multi-stage oxidation cooler, it enters the fluidized bed magnetized roasting furnace through the oxide ore discharge valve, and performs magnetization reduction roasting with the preheated producer gas at 525°C for 25 minutes. Producer gas composition is 20%CO+11%CO 2 +17...

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Abstract

The invention discloses a high-phosphorus hematite-limonite ore fluidized roasting system and method. The system comprises a feed bin, a preheater, a fluidized oxidation roasting furnace, an oxidationcooler, a combustor, a fluidized magnetized roasting furnace, a reducing gas cooler, and air cooler and a discharge bin. The method comprises the steps that: (1) ore powder is preheated by the preheater in the feed bin; (2) phosphorus-contained matters are modified through fluidized oxidation roasting; (3) oxidized ores are cooled through an intermediate oxidation cooler; (4) the low-temperaturefluidized magnetized roasting is performed on the oxidized ores; and (5) the magnetized ores are fed for weak magnetic separation after two-section heat exchange cooling by the reducing gas cooler andthe air cooler. The high-phosphorus hematite-limonite ore fluidized roasting system and method have the advantages of medium-temperature efficient improvement of the phosphorus-contained matters, lowheat load of reactors, effective utilization of sensible heat and low energy consumption, and can achieve the target of efficiently increasing iron and reducing phosphorus in high-phosphorus hematite-limonite ores.

Description

Technical field [0001] The invention belongs to the field of mineral processing and metallurgy, and particularly relates to a fluidized roasting system and method for high-phosphorus hematite. Background technique [0002] my country is rich in iron ore resources and its reserves rank among the top in the world. However, the endowment of iron ore resources is poor. More than 97% are low-grade lean iron ore, and more than 40% are hematite, siderite and other conventional magnetic separation, gravity separation, flotation and other complex physical separation methods that are difficult to effectively separate. Difficult to choose iron ore resources. Among them, high-phosphorus hard-to-select hematite ore accounts for 12% of the total domestic iron ore reserves and 30% of hematite reserves. High-phosphorus hematite is not only difficult to improve iron grade with traditional beneficiation processes, but its phosphorus elements will coexist with iron oxides and enter iron concentra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/10
CPCC22B1/10
Inventor 孙昊延朱庆山王珍谢朝晖
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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