Red mud magnetizing roasting comprehensive utilization system and technology

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...

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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-magnetic substances are discharged together with tailings, resulting in waste

This application for invention can produce higher-grade fine iron ore, but has the following disadvantages: when lignite is used as a reducing agent, because there is too much ash in the lignite, it is difficult to control various reactions in the reduction, making the production of fine iron ore difficult. less efficient

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