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A siderite fluidized oxidation-reduction magnetization roasting system and method

A magnetization roasting and oxidative roasting technology, which is applied in the fields of mineral processing and metallurgy, can solve the problems of increasing the thermal load of the system, affecting the overall energy consumption, affecting the continuous production, etc., and achieving the effect of energy balance optimization.

Active Publication Date: 2020-11-06
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, nitrogen replacement is required between each roasting section, which affects continuous production
At the same time, the pre-oxidation time is 10-120s, and the reaction time design is too short to fully meet the reaction kinetics of coarse particles.
Patent application CN 201610557595.X designed a refractory iron ore powder oxidation-magnetization roasting system and process. By setting pre-oxidation, the iron ore powder is heated to 800-900°C for magnetization roasting. Although the reaction efficiency is higher at high temperature, the system Heat loads also increase significantly, affecting overall energy consumption

Method used

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  • A siderite fluidized oxidation-reduction magnetization roasting system and method

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Experimental program
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Effect test

Embodiment 1

[0038] Such as figure 1 As shown, a siderite fluidized redox magnetized roasting system, the fluidized redox magnetized roasting system includes a feed bin, a preheater, a fluidized oxidation roaster, a burner, a fluidized magnetized Roasting furnace, reducing gas cooler, air cooler and discharge silo,

[0039] The preheater includes a two-stage preheating cyclone and a bag filter 3, and the fluidized oxidation roaster includes an oxidation roaster body 5, an oxidation cyclone separator 6, and an oxidation discharge valve 7. The magnetized roaster includes a magnetized roaster body 8 and a magnetized cyclone separator 9, the reducing gas cooler includes a two-stage reducing gas cooling cyclone and a cooling discharge valve 12, and the air cooler includes a two-stage air cooling cyclone, wherein, The outlet of the feed bin 1 is connected to the air inlet of the first-stage preheating cyclone 2, the top air outlet of the first-stage preheating cyclone 2 is connected to the air ...

Embodiment 2

[0053] Adopt above-mentioned siderite fluidized redox magnetization roasting system to carry out siderite fluidized roasting method as follows:

[0054] The siderite ore is stored in the feed bin and enters the preheater. In the multi-stage preheating cyclone, the ore powder and the hot flue gas tail gas of the fluidized oxidation roaster perform gas-solid countercurrent heat exchange to raise the temperature. The heated hot ore powder enters the oxidation process. The body of the roaster reacts with the hot flue gas for oxidative decomposition and modification. The oxidized ore powder entrained by the air flow is separated from the gas and solid by the oxidation cyclone separator and then returns to the body of the oxidized roaster. The oxidized ore powder is discharged from the outlet of the oxidized roaster body. Then enter the body of the magnetization roasting furnace through the oxidation discharge valve and carry out the magnetization roasting of the iron-containing phas...

Embodiment 3

[0057] The iron grade TFe treated by the invention is 25.3%, the iron element distribution in the siderite-containing phase accounts for 56.9% of the total iron, and the particle size is 0.037-2mm, of which -0.074mm accounts for 50%. Other iron oxides in ore powder are red limonite phase Fe 2 o 3 exist.

[0058] First, the fine ore enters the two-stage cyclone preheater from the silo to exchange heat with the exhaust gas of the oxidation furnace to raise the temperature, and then enters the fluidized bed oxidation roaster for calcination for 10 minutes at a temperature of 650°C and the hot flue gas atmosphere produced by the burner. The siderite is fully decomposed and oxidized in the fluidized bed oxidation roaster. Then it enters the fluidized bed magnetization roasting furnace through the discharge valve of the oxide ore, and performs magnetization reduction roasting with preheated producer gas at 475°C for 20 minutes. Producer gas composition is 20%CO+11%CO 2 +17%H 2 ...

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Abstract

The invention discloses a siderite fluidized redox magnetization roasting system and method. The system comprises a feeding bin, a multi-stage cyclone preheater, a fluidized oxidation roasting furnace, a combustor, a fluidized magnetization roasting furnace, a multi-stage cyclone reducing gas cooler, a multi-stage cyclone air cooler and a discharging bin. The method comprises the following steps of (1) preheating mineral powder from the feeding bin through the preheater; (2) carrying out fluidized pre-oxidation roasting object phase modification; (3) carrying out low-temperature fluidized magnetization roasting on an oxidized ore; and (4) carrying out two-stage heat exchange cooling of a magnetized ore through the reducing gas cooler and the air cooler and carrying out low-intensity magnetic separation. The method has the advantages that the siderite phase is fully oxidized, modified and roasted, the magnetization roasting reaction temperature is remarkably reduced, the heat load of areactor is low, the sensible heat is effectively utilized, and the energy consumption is low.

Description

technical field [0001] The invention belongs to the fields of mineral processing and metallurgy, and in particular relates to a siderite fluidized oxidation-reduction magnetization roasting system and method. 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 complex and refractory iron ore resources that cannot be effectively separated by physical beneficiation methods such as conventional magnetic separation, gravity separation, and flotation. In recent years, with the rapid development of my country's economy, the steel industry consumes a huge amount of iron ore, and its dependence on foreign imports has been above 80% for a long time. Bulk iron concentrate has become one of the important strategic resources for my country's economic development. Therefore, it is imminent to develop ...

Claims

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Application Information

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