Method for dealuminizing and desilicating high-aluminum iron ore concentrate through sodium salt roasting-water leaching

A technology of sodium roasting and high-alumina iron concentrate is applied in the fields of mineral processing and metallurgy, which can solve the problems of long reaction time, low iron recovery rate and poor effect, and achieve the effects of good product quality, efficient separation and simple process.

Inactive Publication Date: 2019-07-19
NORTHEASTERN UNIV
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Problems solved by technology

[0003] On the basis of the primary separation of high-alumina iron ore achieved by the beneficiation process, the secondary separation of aluminum and iron from aluminum-containing iron ore concentrates has become a key technical bottleneck for the development and utilization of high-alumina iron ore resources; the representative technology mainly includes reduction sintering method, direct reduction method, magnetization roasting method and biological method, etc., but there are still many problems, such as the overall process of the reduction sintering method is long, the energy consumption is large, and the recovery rate of iron is low; High energy consumption, difficult to realize industrialization; although the magnetization roasting method can realize the separation of aluminum and iron of high alumina iron ore to a certain extent, the effect is poor; the removal effect of the biological method is limited, the reaction time is long, and large batches Problems such as processing difficulties; therefore, the related technologies for large-scale and efficient utilization of high-aluminum iron concentrates have yet to be developed

Method used

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  • Method for dealuminizing and desilicating high-aluminum iron ore concentrate through sodium salt roasting-water leaching
  • Method for dealuminizing and desilicating high-aluminum iron ore concentrate through sodium salt roasting-water leaching

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Experimental program
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Effect test

Embodiment 1

[0029] Process such as figure 1 shown;

[0030] The main components of the high-aluminum iron concentrate used are: TFe 64.51%, FeO 0.29%, Al 2 o 3 3.10%, SiO 2 3.54%, MgO 0.08%, CaO 0.05%;

[0031] Grinding the high-alumina iron ore concentrate to a particle size of ≤0.074mm accounts for 80% of the total mass to obtain high-alumina iron ore concentrate powder;

[0032] Mix high-alumina iron ore concentrate powder with sodium salt additive, then add water and binder bentonite and mix evenly, and then use a disc pelletizer to make green balls; the mass ratio of high-aluminum iron ore concentrate powder to sodium salt additive 1:0.07; the amount of binder accounts for 1% of the total mass of high-alumina iron ore concentrate powder, and the amount of water is 3% of the total mass of high-aluminum iron ore concentrate powder; the sodium salt additive is sodium carbonate; The particle size is 5mm;

[0033] Put the raw balls in the rotary kiln, use the spray gun to spray coa...

Embodiment 2

[0038] Method is with embodiment 1, and difference is:

[0039] (1) The main components of the high-aluminum iron concentrate used are: TFe 55.23%, FeO 0.13%, Al 2 o 3 11.77%, SiO 2 7.81%, MgO 0.11%, CaO 0.086%;

[0040] (2) The part that is ground to a particle size of ≤0.074mm accounts for 83% of the total mass;

[0041] (3) The sodium salt additive is sodium sulfate; the mass ratio of the high-aluminum iron concentrate powder to the sodium salt additive is 1:0.10; the binder accounts for 0.3% of the total mass of the high-aluminum iron concentrate powder, and the water is the high-aluminum iron concentrate powder 5% of the total mass of the powder; the particle size of the green ball is 8mm;

[0042] (4) The temperature of the reaction section during oxidative roasting is 1000°C, and the material residence time is 30min;

[0043] (5) Part of the particle size ≤ 0.074mm in the powder accounts for 87% of the total mass;

[0044] (6) During water immersion, the stirring ...

Embodiment 3

[0048] Method is with embodiment 1, and difference is:

[0049] (1) The main components of the high-aluminum iron concentrate used are: TFe 61.92%, FeO 12.06%, Al 2 o3 6.83%, SiO 2 4.52%, MgO 0.16%, CaO 0.05%;

[0050] (2) The part that is ground to a particle size of ≤0.074mm accounts for 85% of the total mass;

[0051] (3) The sodium salt additive is an equal mass mixture of sodium carbonate and sodium sulfate; the mass ratio of the high-aluminum iron ore concentrate powder to the sodium salt additive is 1:0.15; the binder accounts for 0.3% of the total mass of the high-aluminum iron ore concentrate powder, Water is 4% of the total mass of high aluminum iron ore concentrate powder; the particle size of green balls is 12mm;

[0052] (4) The temperature of the reaction section during oxidative roasting is 1100°C, and the material residence time is 45min;

[0053] (5) Part of the particle size ≤ 0.074mm in the powder accounts for 85% of the total mass;

[0054] (6) Durin...

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Abstract

The invention relates to a method for dealuminizing and desilicating a high-aluminum iron ore concentrate through sodium salt roasting-water leaching. The method for dealuminizing and desilicating thehigh-aluminum iron ore concentrate through sodium salt roasting-water leaching comprises the following steps of (1) finely grinding the high-aluminum iron ore concentrate; (2) mixing high-aluminum iron ore concentrate powder and a sodium salt additive, adding water and a binding agent, and manufacturing a green ball through a pelletizing machine; (3) putting in a rotary kiln, and heating, oxidizing and roasting through a spray gun, wherein the temperature of a reaction section is 850 to 1100 DEG C; (4) water-quenching the roasted ball material, crushing and finely grinding; (5) putting in water, stirring, water leaching, filtering and separating to obtain a water-leaching residue; and (6) drying to remove moisture, and obtaining the dealuminized iron ore concentrate. The method provided by the invention can be used for high-efficiently separating iron, aluminum and silicon, and has the advantages of simple and quick process, low cost, good product quality, safety, environment protection and the like.

Description

technical field [0001] The invention belongs to the technical fields of mineral processing and metallurgy, and in particular relates to a method for sodium roasting high-aluminum iron concentrate-water immersion dealumination and silicon removal. Background technique [0002] my country's iron ore resources are abundant, but most of them are low-grade ore, with an average ore grade of only 32%, and the embedded particle size is fine, the mineral coexistence and associated relationship are complex, and the impurities Al and Si are high. Guizhou, Hubei, Hunan, Yunnan, Guangxi and other places are rich in high-alumina iron ore resources; how to use this part of resources is crucial to the healthy development of my country's iron and steel enterprises; Combined gravity and magnetic separation, selective flocculation flotation, flocculation-magnetic separation, strong magnetic and other processes are adopted. However, since aluminum mainly exists in iron minerals in the form of f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B1/243
CPCC22B1/02C22B1/2406C22B1/243Y02P10/20
Inventor 余建文韩跃新王勋李艳军高鹏
Owner NORTHEASTERN UNIV
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