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Method for magnetizing and roasting iron tailings through biomass

A technology of magnetization roasting and biomass, which is applied in the field of solid waste resource utilization, can solve the problem that the recovery rate and grade of iron tailings cannot be taken into account at the same time, so as to reduce the emission of pollutants such as SO2 and NOx, and reduce the emission of CO2 , to achieve the effect of high-speed rail recovery

Pending Publication Date: 2021-11-05
GUANGDONG UNIV OF TECH
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Problems solved by technology

[0004] Currently, the reducing gas produced by pyrolysis of biomass is commonly used to magnetize and roast iron tailings. For example, patent CN201010034534.8 discloses a method for producing iron concentrate by magnetizing and reducing limonite with biomass. This patent combines limonite and raw After the material is pulverized and mixed evenly, it is roasted, the limonite is reduced to magnetic iron oxide, and then magnetically separated to obtain iron concentrate. However, in this method, the biomass oil produced by biomass pyrolysis will agglomerate on the surface of iron tailings , affect the further reduction and subsequent magnetic separation of iron tailings, resulting in the inability to take into account the recovery rate and grade of iron tailings at the same time. Therefore, it is urgent to find a method of magnetizing and roasting iron tailings to make Biomass oil will not affect the reduction of iron tailings and subsequent magnetic separation operations to obtain iron concentrates with high iron recovery and iron grade

Method used

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  • Method for magnetizing and roasting iron tailings through biomass

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Embodiment 1 A kind of method of biomass magnetization roasting iron tailings

[0055] S1. Dry the iron tailings in a blast drying oven at 105°C for 24 hours, crush them after cooling, and then grind them to -0.074mm (through a 200-mesh sieve) with a planetary ball mill to obtain iron tailings powder;

[0056] S2. Dry the eucalyptus wood in a forced air drying oven at 105°C for 24 hours, and after cooling, crush it to -0.15mm in a crusher (passing through a 100-mesh sieve) to obtain eucalyptus wood chips;

[0057] S3. Introduce nitrogen into the tube furnace to replace the air in the furnace chamber and its connection. At the same time, set two gas washing bottles at the gas outlet. One washing bottle is filled with water to prevent air from being sucked back in, and the other is left empty to prevent the cooling process. Reclaimed water is sucked back into the tube furnace; 10g of iron tailings powder and 1.5g of eucalyptus wood chips are placed on two porcelain boats re...

Embodiment 2

[0059] Embodiment 2 A kind of method of biomass magnetization roasting iron tailings

[0060] With the method of Example 1, the difference is that step S2 uses pine instead of eucalyptus; step S3 uses 1 g of pine chips.

Embodiment 3

[0061] Embodiment 3 A kind of method of biomass magnetization roasting iron tailings

[0062] The same as the method in Example 1, the difference is that in step S2, fir is used instead of eucalyptus; in step S3, the amount of fir chips is 2.5g; in step S4, the magnetic induction of wet magnetic separation is 0.2T.

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Abstract

The invention provides a method for magnetizing and roasting iron tailings through biomass. The method comprises the following steps that firstly, crushing the iron tailings, and grinding to -0.074 mm to obtain iron tailing powder; crushing the biomass to obtain biomass powder; separately placing the iron tailing powder and the biomass powder at different parts in the same heat-resistant closed container, and carrying out magnetizing and roasting at 600-750 DEG C; and finally, cooling, grinding and magnetically separating the roasted iron tailing powder to obtain magnetite concentrate. Weakly magnetic oxides such as hematite in the iron tailings are converted into strong magnetic magnetite by reducing gases such as H2 and CO generated by biomass pyrolysis, the biomass and the iron tailings are separately roasted to prevent agglomeration, impurities such as silicon and aluminum are removed by adopting processes such as grinding combined with magnetic separation, and the iron grade and the iron recovery rate of the magnetite concentrate are effectively improved.

Description

technical field [0001] The invention belongs to the technical field of resource utilization of solid waste. More specifically, it relates to a method for magnetizing and roasting iron tailings with biomass. Background technique [0002] In recent years, the supply of iron ore in the world has become increasingly tight, and the price of iron ore has risen sharply. However, the cumulative stock of iron tailings in my country exceeds 5 billion tons, containing a large amount of recyclable iron resources. Existing methods of magnetization roasting are commonly used to reclaim iron resources. Magnetization roasting is to convert weakly magnetic iron minerals (such as hematite, limonite, siderite and pyrite, etc.) into strong magnetic magnetite, and then A method of separating strong magnetic iron minerals and gangue minerals through weak magnetic separation and other separation technologies, and then obtaining iron concentrates. Magnetization and roasting of low-grade weakly ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02B03C1/015
CPCC22B1/02B03C1/015Y02P10/20
Inventor 欧蔚萱宁寻安邓金环王逸
Owner GUANGDONG UNIV OF TECH
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