Process for recycling iron ore concentrate and ore sand from aluminum oxide red mud

A technique for recovering alumina and iron, applied in chemical instruments and methods, solid separation, magnetic separation, etc., can solve problems such as excessive content of Al2O3 and SiO2, failure to reach the grade that can be directly smelted, poor quality of iron concentrate, etc., to achieve The effect of saving construction and operating costs, reducing environmental pollution discharge fees, and reducing emissions

Pending Publication Date: 2020-08-28
金建工程设计有限公司
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Problems solved by technology

[0003] However, the technology in the prior art usually recovers iron concentrate from alumina red mud with a low grade, which cannot reach the grade that can be directly smelted, and the content of Al2O3 and SiO2 in the iron concentrate exceeds the standard seriously, and the quality of the iron concentrate is relatively low. Difference

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  • Process for recycling iron ore concentrate and ore sand from aluminum oxide red mud

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Embodiment 1

[0032] A process for recovering iron concentrate and ore from alumina red mud, the process comprises the following steps:

[0033] S1: Discharge the red mud slurry from the bottom flow of the last washing settling tank into the feeding tank and add water to pre-mix, and adjust the concentration of the pre-mixed red mud slurry to 25%, and then put it into the feeding tank The premixed red mud slurry is fed into the first cyclone for gravity separation treatment to obtain gravity separation concentrate and gravity separation tailings, and the gravity separation tailings are discharged into the outer discharge tank;

[0034] S2: Add the gravity-selected concentrate to a cylindrical sieve with a sieve hole of 1mm for grading treatment, then add the gravity-selected concentrate on the cylindrical screen to the sand extraction tank, and the The re-election concentrate is fed into the first strong magnetic separator for a strong magnetic separation, the magnetic field strength of the...

Embodiment 2

[0039] A process for recovering iron concentrate and ore from alumina red mud, the process comprises the following steps:

[0040] S1: Discharge the red mud slurry from the bottom flow of the last washing settling tank into the feeding tank and pre-mix with water, and adjust the concentration of the pre-mixed red mud slurry to 35%, and then put it into the feeding tank The premixed red mud slurry is fed into the first cyclone for gravity separation treatment to obtain gravity separation concentrate and gravity separation tailings, and the gravity separation tailings are discharged into the outer discharge tank;

[0041]S2: Add the gravity-selected concentrate to a cylindrical sieve with a sieve hole of 0.5mm for grading treatment, then add the gravity-selected concentrate on the cylindrical screen to the sand extraction tank, The re-selected ore concentrate is fed into the first strong magnetic separator for a strong magnetic separation, the magnetic field intensity of the str...

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Abstract

The invention discloses a process for recycling iron ore concentrate and ore sand from aluminum oxide red mud. The process comprises the following steps that red mud slurry obtained after water is added for premixing is subjected to gravity separation; gravity concentrate is graded, then primary strong magnetic separation is carried out, then primary ore grinding is carried out, and finally secondary strong magnetic separation is carried out; materials in a magnetic concentrate tank are subjected to reverse flotation and secondary ore grinding, then materials obtained after ore grinding are subjected to weak magnetic separation, concentrate obtained after the weak magnetic separation is subjected to filter pressing, and the iron ore concentrate and filtrate are obtained; materials in a sand extraction tank are subjected to grading treatment to obtain an ore sand product; and materials in a discharging tank are conveyed to a red mud tailing pond for stockpiling. The process has the beneficial effects that the available iron ore concentrate and ore sand in the red mud can be extracted through the process of combining hydrocyclone gravity separation, strong magnetic separation, reverse flotation, weak magnetic separation, hydrocyclone grading and vibrating screen grading, waste is turned into wealth, and the stockpiling time of the red mud tailing pond can be prolonged.

Description

technical field [0001] The invention relates to the technical field of metallurgical beneficiation, in particular to a process for recovering iron concentrate and ore from alumina red mud. Background technique [0002] Red mud sedimentation, separation and washing is one of the important processes in the production process of Bayer process alumina. The red mud produced in the final washing process of this process is industrial waste with high alkalinity and large specific surface area produced in the process of alumina production, which needs to be discharged To the red mud yard for storage. Because red mud contains a large amount of alkaline chemicals, the higher pH value determines that red mud is corrosive to organisms, metals and siliceous materials. Due to the decline of bauxite grade, the output rate of red mud has increased year by year, and the red mud stockyard is under increasing pressure. With the development of the aluminum industry, the cumulative stockpiling ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03B7/00B03B9/00B03C1/30
CPCB03B7/00B03B9/00B03C1/30
Inventor 陆扬侯仰令王玉娟王德强武良光栾彦娜岳士睿王德志
Owner 金建工程设计有限公司
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