Method for preparing iron ore concentrate and aluminum ore concentrate through suspension co-roasting of red mud and coal gangue

A technology of suspension roasting and coal gangue, applied in chemical instruments and methods, solid separation, cyclone devices, etc., can solve the problems of iron and aluminum resource loss, waste, and reduce the consumption of activation aid alkali, etc., to achieve strong adaptability , improve the effect of dissolution

Active Publication Date: 2020-10-09
NORTHEASTERN UNIV
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Problems solved by technology

[0005] At present, there are few patents on the mixed utilization of red mud and coal gangue, which are generally used to prepare glass-ceramics, bricks, roadbed materials and cement, etc., realizing the reuse of solid waste such as red mud and coal gangue, but causing iron and Great loss and waste of aluminum resources; patent CN201310337154.5 discloses a method of using red mud to activate gangue and/or fly ash, and proposes to combine gangue and/or fly ash with red mud and Na 2 CO 3 Batching, then acid leaching to extract alumina after sintering at 600-1000°C, this patent reduces the consumption o

Method used

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  • Method for preparing iron ore concentrate and aluminum ore concentrate through suspension co-roasting of red mud and coal gangue

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Process such as figure 1 shown;

[0044] The iron grade of the red mud used is TFe 46.17%, containing Al by mass percentage 2 o 3 12.03%, SiO 2 2.77%, Na 2 O1.9%, of which iron minerals are mainly hematite and goethite;

[0045] The coal gangue used contains Al by mass percentage 2 o 3 27.08%, SiO 2 30.58%, fixed carbon 15.17%, iron grade TFe5.67%, of which aluminum minerals are mainly kaolinite and illite; coal gangue is crushed to a particle size of ≤ 12mm, and then ground to a particle size of -0.038mm to account for the total mass 80%, made into coal gangue powder;

[0046] Mixing the red mud raw material and coal gangue powder to obtain a mixed powder; the mass ratio of the red mud raw material to the coal gangue powder in the mixed powder is 4;

[0047] A suspension high-temperature furnace equipped with a burner at the bottom is adopted. The lower part of the suspension high-temperature furnace is provided with a feed port, and the upper discharge po...

Embodiment 2

[0052] Method is with embodiment 1, and difference is:

[0053] (1) The iron grade TFe of the red mud used is 26.52%, containing Al by mass percentage 2 o 3 17.23%, SiO 2 6.89%, Na 2 O4.3%; the red mud is subjected to weak magnetic separation, the magnetic field strength is 1000Oe, the weak magnetic separation concentrate obtained by weak magnetic separation is subjected to strong magnetic separation, the magnetic field strength of strong magnetic separation is 9000Oe, and the strong magnetic separation concentrate obtained by strong magnetic separation As raw material of red mud, iron grade TFe36.53%, containing Al by mass percentage 2 o 3 13.23%;

[0054] (2) The coal gangue used contains Al by mass percentage 2 o 3 19.08%, SiO 2 32.87%, fixed carbon 10.46%, iron grade TFe 15.67%; crush coal gangue to a particle size ≤ 12mm, and then grind to a particle size of -0.038mm, accounting for 85% of the total mass, and make coal gangue powder;

[0055] (3) The mass rat...

Embodiment 3

[0063] Method is with embodiment 1, and difference is:

[0064] (1) The iron grade TFe of the red mud used is 19.74%, containing Al by mass percentage 2 o 3 20.36%, SiO 2 6.3%, Na 2 O1.7%; the red mud is subjected to weak magnetic separation, the magnetic field strength is 1500Oe, the weak magnetic separation concentrate obtained by weak magnetic separation is subjected to strong magnetic separation, the magnetic field strength of strong magnetic separation is 12000Oe, and the strong magnetic separation concentrate obtained by strong magnetic separation as red mud raw material;

[0065] (2) The coal gangue used contains Al by mass percentage 2 o 3 34.26%, SiO 2 31.59%, fixed carbon 12.16%, iron grade TFe 11.45%; crush the coal gangue to a particle size of ≤12mm, and then grind the part until the particle size is -0.038mm, accounting for 75% of the total mass, and make coal gangue powder;

[0066] (3) The mass ratio of red mud raw material and coal gangue powder in th...

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Abstract

The invention discloses a method for preparing iron ore concentrate and aluminum ore concentrate by suspension co-roasting of red mud and coal gangue. The method comprises the following steps of: (1)crushing and grinding coal gangue; (2) mixing a red mud raw material with the coal gangue powder; (3) conveying the mixed powder to a suspension high-temperature furnace, enabling the mixed powder tobe in a suspension state under the action of negative pressure and airflow, heating the mixed powder to 650-1000 DEG C, and dehydrating the mixed powder to form high-temperature powder; (4) enabling the high-temperature powder to enter a cyclone separator, cooling to 600-950 DEG C to form a dehydrated material, and enabling the dehydrated material to enter a suspension roasting reducer; (5) introducing air and nitrogen into the suspension roasting reducer to enable the dehydrated material to be in a suspension state, cooling to 500-800 DEG C, reacting, and discharging the residual solid material as a reduction material; and (6) cooling the reduction material, grinding, and carrying out low-intensity magnetic separation to obtain magnetic iron ore concentrate and non-magnetic aluminum ore concentrate. The method disclosed by the invention is short and efficient in process, low in energy consumption, low in treatment cost, good in economy, environment-friendly and easy to realize large-scale industrial application.

Description

technical field [0001] The invention relates to the technical field of mineral processing and environmental protection, in particular to a method for preparing iron concentrate and aluminum concentrate by suspending and co-roasting red mud and coal gangue. Background technique [0002] Red mud is a reddish-brown strongly alkaline fine-grained waste slag discharged during the production of alumina. At present, most of the red mud is stockpiled and disposed of, which not only occupies land, pollutes soil, water and air, but also causes a lot of waste of useful metals; the stockpiling of red mud causes The safety, environment and ecological problems seriously threaten the sustainable development of the alumina industry. [0003] Coal gangue is solid waste discharged during coal mining and coal washing, accounting for about 10-20% of the total coal output. At present, the annual discharge of coal gangue in the global coal mining industry is about 350 million tons; long-term sto...

Claims

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Application Information

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IPC IPC(8): B03C1/30B04C9/00C22B1/02
CPCB03C1/30B04C9/00C22B1/02B04C2009/002
Inventor 韩跃新袁帅柳晓高鹏李艳军
Owner NORTHEASTERN UNIV
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