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Method for comprehensive recovery and treatment of red mud waste residue and titanium dioxide waste liquid

A titanium dioxide waste liquid, recycling and treatment technology, applied in the direction of improving process efficiency, etc., can solve the problems of multiple devices, occupancy, single, etc., and achieve the effect of large quantity, simple process flow, and wide sources of waste

Active Publication Date: 2015-09-16
HUNAN RARE EARTH METAL MATERIAL RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The above-mentioned recycling objects are only aimed at a single red mud waste residue or titanium dioxide waste liquid. Although certain effects have been achieved, because they are all recycled solely for red mud waste residue or titanium dioxide waste liquid, it takes up too much Therefore, how to comprehensively recover the high value-added rare earth and scandium resources in red mud waste residue and titanium dioxide waste liquid has become the current research direction

Method used

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  • Method for comprehensive recovery and treatment of red mud waste residue and titanium dioxide waste liquid

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Embodiment approach

[0045] According to a typical implementation of the present invention, the calcination process includes: keeping the dried hydrolysis slag at 300°C-400°C for 40-60 minutes, then keeping it at 600-700°C for 80-120 minutes, and finally heating it at 850°C ℃~950℃ for 40~60 minutes. The above-mentioned calcination method is conducive to the stable formation of titanium dioxide, can recover the valuable element titanium to the maximum extent, and has the advantages of high product recovery rate and purity.

[0046] Preferably, the process of preparing aluminum-rich slag and iron concentrate in step S33 includes: adjusting the pH of the hydrolyzate to 9-11 to obtain a precipitate and a precipitate; Reductive smelting to obtain a smelted mixture; and performing magnetic separation on the smelted mixture at a magnetic separation intensity of 0.7-0.9T to obtain aluminum-rich slag and iron concentrate. Among them, the precipitate is mainly iron hydroxide precipitation and aluminum hydr...

Embodiment 1

[0049] The valuable elements rare earth, scandium, titanium, iron and aluminum are comprehensively recovered from red mud waste residue and titanium dioxide waste liquid through the following steps. Among them, the main component content of red mud waste residue: RE x o y 0.10%, Sc 2 o 3 0.01%, TiO 2 4.88%, Fe 2 o 3 37.37%, Al 2 o 3 5.69%; main component content of titanium dioxide waste liquid: RE x o y 3.7mg / L, Sc 2 o 3 9.4mg / L, TiO 2 2.02g / L, Fe 2 o 3 31.33g / L, Al 2 o 3 1.00g / L, H 2 SO 4 2.70mol / L.

[0050] 1) Take 100g of red mud waste residue and 500ml of titanium dioxide waste liquid according to the liquid-solid ratio (volume:mass) 5:1 and mix and leaching at 90°C for 2 hours to obtain 590ml of leaching solution. The mass of each element in the leaching solution The percentage concentrations are as follows: RE x oy 0.15g / L, Sc 2 o 3 22.85mg / L, Fe 2 o 3 78.23g / L, Al 2 o 3 8.58g / L, the calculated leaching rate of rare earth elements in red mud wa...

Embodiment 2

[0061] The selected red mud waste slag and titanium dioxide waste liquid are the same as those in Example 1, and their chemical components are the same as above.

[0062] 1) Mix 100g of red mud waste residue and 400ml of titanium dioxide waste liquid at a liquid-to-solid ratio of 4:1, and then leaching at 50°C for 1 hour to obtain 430ml of leaching solution, in which the mass percentage concentration of each element in the leaching solution is as follows :RE x o y 0.17g / L, Sc 2 o 3 24.37mg / L, Fe 2 o 3 90.00g / L, Al 2 o 3 10.17g / L, the calculated leaching rate of rare earth elements in red mud residue is 71.57%, leaching rate of scandium element is 67.22%, leaching rate of iron element is 70.01%, and leaching rate of aluminum element is 69.81%.

[0063] 2) Take 400ml of the leaching solution, and use P204 with a volume percentage concentration of 10% for primary extraction. During the extraction process, ethanol is added as a demulsifier (the volume of ethanol is 10% of t...

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Abstract

The invention discloses a comprehensive recovery and processing method for red mud waste residues and titanium dioxide spent liquor. The method comprises the following steps: S1, carrying out mixed leaching on red mud waste residues and titanium dioxide spent liquor, so that leaching liquid and leaching residues are obtained; S2, carrying out leaching liquid treatment on the leaching liquid so as to obtain scandium oxide and a rare earth product, wherein the leaching liquid treatment includes extraction treatment and reverse extraction treatment; S3, carrying out leaching residue treatment on the leaching residues so as to obtain titanium dioxide, aluminum-rich residues and iron ore concentrates, wherein the leaching residue treatment includes acidification, hydrolysis and precipitation treatments. The method solves the problems of industrial waste residue stockpiling, spent liquor discharge, and environmental protection; two kinds of waste materials are comprehensively treated after being mixed, so that the consumption of raw materials is reduced, the production cost is greatly saved, and high-concentration valuable elements such as rare earth, scandium, titanium, iron, and aluminum and the like are obtained, thereby facilitating the implementation of the next recovery process. The method is simple in process and low in equipment requirement, and has certain economic benefits and social significances in the comprehensive recovery of valuable elements such as rare earth, scandium, titanium, iron and aluminum in industrial waste materials and spent liquor.

Description

technical field [0001] The invention relates to the technical field of waste recovery and utilization, in particular to a method for comprehensive recovery and treatment of red mud waste residue and titanium white waste liquid. Background technique [0002] The invention relates to the technical field of resource recovery and utilization of rare earths, scandium, titanium, iron, aluminum, etc., and specifically relates to a method for comprehensively recovering valuable elements rare earths, scandium, titanium, iron, and aluminum from industrial waste red mud residue and titanium white waste liquid. [0003] Red mud is a strong alkaline solid waste residue produced in the process of producing alumina from bauxite. For Sc, rare earth elements, etc., about 0.8 to 1.5 tons of red mud are produced for every ton of alumina produced. A large amount of red mud is piled up, which not only occupies land resources, but also causes environmental pollution and potential safety hazards....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B3/04C22B59/00C22B34/12C22B21/00
CPCY02P10/20
Inventor 刘吉波杨涛吴希桃邓志军包新军余荣旻
Owner HUNAN RARE EARTH METAL MATERIAL RES INST
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