Red mud magnetizing roasting comprehensive utilization system and technology

A technology of magnetized roasting and red mud, which is applied in the comprehensive utilization system and process field of magnetized roasting of red mud, which can solve the problems of waste, low efficiency of fine iron ore, and difficult control of various reactions in reduction, so as to achieve rapid response and improve iron grade , Improve the effect of comprehensive utilization value

Pending Publication Date: 2019-01-08
青岛盈坤源矿业科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the invention application can extract and separate the iron ore concentrate, it has the following disadvantages: when the red mud is magnetized and roasted in this method, after the coal powder is mixed with the red mud, the red mud may be over-reduced, resulting in the reduction of the red mud to a non-magnetic product , during magnetic separation, more iron-containing non-magneti

Method used

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  • Red mud magnetizing roasting comprehensive utilization system and technology
  • Red mud magnetizing roasting comprehensive utilization system and technology
  • Red mud magnetizing roasting comprehensive utilization system and technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Embodiment 1: A comprehensive utilization system of red mud magnetization roasting, such as figure 1 and figure 2 As shown, it includes a mixer 1, a dryer 2, a rotary kiln 3, a magnetic separator 4, and a filter press 5, and the rotary kiln 3 is provided with a coke oven gas pipeline 31.

[0056] The mixer 1 is provided with a material inlet and a material outlet. The material inlet of the mixer 1 is connected to a first conveying device 11 , and the other end of the first conveying device 11 is connected to a red mud stockpiling area. Mixer 1 can use the DCS control high-viscosity material mixer produced by Jiuye Sanwei Chemical Machinery, which is suitable for mixing red mud with viscosity to make the material fully mixed. The first conveying device 11 may be a belt conveyor, and the red mud is transported to the mixer 1 through the first conveying device 11 . An additive funnel is provided at the feed port of the mixer 1, and pre-prepared additives are placed in t...

Embodiment 2

[0088] Example 2: A comprehensive utilization process of red mud magnetization roasting, such as image 3 As shown, the difference from Example 1 is that the non-magnetic tailings after magnetic separation are subjected to cooking and pressure filtration treatment.

[0089] Mix the non-magnetic tailings with an excess of 1.3-1.5% of the oxidant sodium persulfate based on the silicon content of the slag. The functions of sodium persulfate are as follows: First, its oxidation prevents silicon from becoming low-priced and easy-to-gel SiO 3 2- , and become SiO with high price and not easy to gel 4 2- , the second is to provide Na + , making silicon a macromolecular Na that is not easy to gel 2 SiO 4 , easy to filter and separate. Then put the mixed material into a heatable reaction kettle, add sodium hydroxide solution in the reaction kettle and carry out microboiling cooking for 1-2h, so that the aluminum is Na 2 AlO 2 Dissolution, oxidation of silicon into non-colloidal ...

Embodiment 3

[0098] Embodiment 3: A red mud magnetization roasting comprehensive utilization process. The difference from Embodiment 1 is that the iron fine powder separated by the magnetic separator is further subjected to reverse flotation to remove impurities and improve the grade of the iron fine powder. Specific steps are as follows:

[0099] (1) The iron ore powder is ultra-finely ground in a ball mill to an average fineness of 250 mesh, of which 250-300 mesh accounts for more than 90% of the total.

[0100] (2) Put the ultra-fine iron ore powder into the flotation tank, add water and stir to form a slurry, so that the ultra-fine iron ore powder is suspended in the solution. The average concentration of the iron ore powder in the solution is 30g / L, and the water temperature is controlled At 40°C, add DBU to adjust the pH value of the slurry to 11, and the stirring speed is 1200r / min.

[0101] (3) Add flotation agent to the solution, the mass ratio of flotation agent to iron ore powd...

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Abstract

The invention discloses a red mud magnetizing roasting comprehensive utilization system and a red mud magnetizing roasting comprehensive utilization technology, and relates to the technical field of mineral resource utilization. The red mud magnetizing roasting comprehensive utilization technology is characterized by the following steps: performing detecting analysis and proportioning materials: sampling red mud for detecting analysis, and proportionally adding an additive for inhibiting high-temperature bonding of silicon titanium aluminum and iron into the red mud; stirring and drying: stirring the proportioned red mud for 30-60min so as to uniformly mix the materials, and then drying, wherein the drying temperature is 180-200 DEG C; performing roasting reduction: performing roasting reduction on the dried materials, wherein the reduction temperature is controlled at 750-1150 DEG C and the reduction time is 15-60 min; performing magnetic separation: cooling a product obtained after the roasting reduction, then grinding, and then sequentially sieving through two stages of magnetic fields to separate out magnetic iron ore powder and non-magnetic tailings. Through the red mud magnetizing roasting comprehensive utilization system and the red mud magnetizing roasting comprehensive utilization technology, the problem of low reaction efficiency due to high ash content during use ofbrown coal for reducing the red mud in conventional magnetizing roasting is solved, magnetizing roasting equipment is optimized and improved, and the comprehensive utilization rate of the red mud is increased.

Description

technical field [0001] The invention relates to the technical field of mineral resources utilization, more specifically, it relates to a red mud magnetization roasting comprehensive utilization system and process. Background technique [0002] Red mud is the waste residue after extracting alumina from bauxite in the non-ferrous aluminum industry. Because it contains iron oxide, the surface is red mud-like and strongly alkaline. Generally, 1.5 tons of red mud is produced for every ton of alumina produced. The chemical composition of red mud is relatively complex, mainly including Al 2 o 3 , SiO 2 , Fe 2 o 3 , CaO, TiO 2 、Na 2 O, in addition to containing a small amount of rare metals. At present, there are a lot of red mud stocks, which are generally stockpiled. After the rain, CaO, Na 2 O reacts with rainwater to form strong alkaline waste liquid, which directly pollutes surface and groundwater sources and directly endangers human health. Therefore, it is imminent t...

Claims

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Application Information

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IPC IPC(8): C03C13/06C03B37/04C04B28/14C04B18/04C04B18/14C01F7/02B82Y40/00C01C1/26C22B1/02C25C1/06C25C1/22C04B7/147
CPCC22B1/02C25C1/06C25C1/22B82Y40/00C01C1/26C01F7/02C03B37/04C03C13/06C04B7/147C04B18/0409C04B18/142C04B28/14C04B18/08C04B14/06C04B22/064Y02W30/91Y02P10/20Y02P40/10
Inventor 刘步有
Owner 青岛盈坤源矿业科技有限公司
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