Method for comprehensively recycling such valuable metals as iron, aluminum, scandium, titanium, vanadium and the like in red mud

A technology for recovering valuable metals and iron, applied in the direction of improving process efficiency, etc., can solve problems such as difficulty, poor economy, difficult industrial application, etc., and achieve the effect of reducing processing costs

Active Publication Date: 2014-07-02
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Abstract
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  • Claims
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Problems solved by technology

[0005] There are several problems in the existing research on red mud recycling technology: 1. At present, most of the leaching processes are to directly use acid to leach red mud, and directly extract valuable metals such as iron and aluminum, but the content of alkali in red mud Very high, if it is directly leached with acid, the consumption of acid will be large, and the cost of treatment will increase
2. The recovery and extraction of iron, aluminum, and sodium elements with high content or the recovery and extraction of precious metal elements scandium, titanium, and vanadium with low content are considered poor in economy, and the comprehensive utilization is not complete. It is very difficult to extract a precious metal element with a very small content, and it is difficult to realize industrial application

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  • Method for comprehensively recycling such valuable metals as iron, aluminum, scandium, titanium, vanadium and the like in red mud

Examples

Experimental program
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Effect test

Embodiment 1

[0013] 1) Mix 50kg of red mud with 25kg of coal ash for magnetization roasting to make Fe 2 o 3 converted to Fe 3 o 4 ;(2) Magnetic iron concentrate and non-magnetic products are obtained through magnetic separation, wherein the recovery rate of iron concentrate is 94%, and the iron content is >90%; (3) Non-magnetic products are dissolved with dilute alkali to dissolve alumina; Washing slag and 50 liters of water are mixed into a slurry, which is used as an absorbent to absorb SO in coal-fired flue gas 2 . In this process, the alkali in the washing slag is replaced by SO 2 Neutralize and dissolve, and the pH can be reduced to 5; (5) Add 90% H to the washing residue 2 SO 4 Carry out acidolysis, dissolve scandium and titanium in the acidolysis solution, and the acidolysis residue contains SiO 2 , can be directly used in the production of cement and refractory materials; (6) The acid solution is heated to between 90°C and 100°C, and metatitanic acid seeds are added, and ti...

Embodiment 2

[0016] 1) Combine 40kg red mud with 20m 3 Coal gas is mixed for magnetization roasting, so that Fe 2 o 3 converted to Fe 3 o 4 ;(2) Obtain magnetic iron concentrate and non-magnetic products through magnetic separation, in which the recovery rate of iron concentrate is 93%, and the iron content is >91%; (3) Non-magnetic products are dissolved with dilute alkali to dissolve alumina; Washing slag and 40 liters of water are mixed into a slurry, which is used as an absorbent to absorb SO in coal-fired flue gas 2 . In this process, the alkali in the washing slag is replaced by SO 2 Neutralize and dissolve, and the pH can drop to 7; (5) Add 90% H to the washing residue 2 SO 4 Carry out acidolysis, dissolve scandium and titanium in the acidolysis solution, and the acidolysis residue contains SiO 2 , can be directly used in the production of cement and refractory materials; (6) The acid solution is heated to between 90°C and 100°C, and metatitanic acid seeds are added, and tit...

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Abstract

The invention provides a method for comprehensively recycling such valuable metals as iron, aluminum, scandium, titanium, vanadium and the like in red mud. The method can not only be used for recycling such elements with higher contents in the red mud as iron, aluminum, silicon and the like, but also can be used for comprehensively recycling and extracting valuable metals with relatively lower contents such as titanium, vanadium, scandium and the like, effective elements in the red mud can almost completely utilized in high efficiency, the entire process flow achieves zero emission of the red mud, thereby meeting the requirements of energy saving and environmental protection, and no new pollution is generated in the entire process flow.

Description

technical field [0001] The invention relates to a method for extracting valuable metals from red mud, in particular to a method for comprehensively recovering valuable metals such as iron, aluminum, scandium, titanium and vanadium from red mud. Background technique [0002] Alumina red mud is a waste in the process of alumina production. my country is a big country of alumina production and produces tens of millions of tons of red mud every year. At present, most alumina production enterprises at home and abroad store red mud in open yards, which contains a large amount of industrial alkali, fluoride and other metals. It is very easy to cause pollution and damage to the surface, air, and groundwater, and there is a potential safety hazard of red mud leakage. While my country's aluminum industry is developing rapidly. Problems such as resource waste, environmental pollution and safety hazards caused by red mud stockpiling have become increasingly prominent. Therefore, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B21/00C22B34/12C22B34/22C22B59/00
CPCY02P10/20
Inventor 董红军甘霖张正林许家伟梁愈斌谭金玉郑进城
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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