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Scandium extraction pretreatment system, and treatment method for scandium-containing solution

A treatment method and pretreatment technology, applied in the direction of improving process efficiency, can solve problems such as large equipment investment, large land occupation, and long product production cycle.

Active Publication Date: 2021-06-29
CHINA ENFI ENGINEERING CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For this pretreatment scheme, the common practice in the industry is to use flat-bottomed tanks for static aging. During aging, at least three tanks are required, which are used for liquid intake, static aging, and liquid drainage. The equipment investment is large and occupies a large area. And the product production cycle is long

Method used

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  • Scandium extraction pretreatment system, and treatment method for scandium-containing solution
  • Scandium extraction pretreatment system, and treatment method for scandium-containing solution
  • Scandium extraction pretreatment system, and treatment method for scandium-containing solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] (1) Send the scandium-containing solution at 60°C into the conditioning tank, mix it with concentrated sulfuric acid at a ratio of 1:0.01 to make a conditioning solution, and the pH value of the conditioning solution is 2;

[0067] (2) The conditioning solution obtained in step (1) is pumped into the aging settling tank, and the current frequency of the conditioning solution delivery centrifugal pump is adjusted so that the residence time of the solution in the tank is controlled at 12h, and the online turbidity meter shows , the inlet turbidity is 200ppm, the overflow outlet turbidity is 100ppm, the solution turbidity drops by 50%, and the overflow temperature drops to 35°C;

[0068] (3) the overflow that step (2) obtains is sent in the fixed bed clarifier through the overflow intermediate tank with the frequency conversion centrifugal pump, after clarifier fine filtration, the turbidity in the overflow is 80ppm, and calcium sulfate concentration in the solution is 0.1...

Embodiment 2

[0071] (1) Send the scandium-containing solution at 50°C into the conditioning tank, mix it with concentrated sulfuric acid at a ratio of 1:0.1 to make a conditioning solution, and the pH value of the conditioning solution is 0.5;

[0072] (2) The conditioning solution obtained in step (1) is pumped into the aging settling tank, and the current frequency of the centrifugal pump for regulating the conditioning solution is adjusted so that the residence time of the solution in the tank is controlled at 72h, and the online turbidity meter shows , the inlet turbidity is 300ppm, the overflow outlet turbidity is 90ppm, the solution turbidity drops by 70%, and the overflow temperature drops to 25°C;

[0073] (3) the overflow that step (2) obtains is sent in the fixed bed clarifier through the overflow intermediate tank with the frequency conversion centrifugal pump, after clarifier fine filtration, the turbidity in the overflow is 10ppm, and calcium sulfate concentration in the soluti...

Embodiment 3

[0076] (1) Send the scandium-containing solution at 55°C into the conditioning tank, mix it with concentrated sulfuric acid at a ratio of 1:0.05 to make a conditioning solution, and the pH value of the conditioning solution is 1.2;

[0077] (2) The conditioning solution obtained in step (1) is pumped into the aging settling tank, and the current frequency of the centrifugal pump for regulating the conditioning solution is adjusted so that the residence time of the solution in the tank is controlled at 36h, and the online turbidity meter shows , the inlet turbidity is 250ppm, the overflow outlet turbidity is 120ppm, the solution turbidity drops by 52%, and the overflow temperature drops to 30°C;

[0078] (3) the overflow that step (2) obtains is sent in the fixed-bed clarifier through the overflow intermediate tank with the frequency conversion centrifugal pump, after the fine filtration of the clarifier, the turbidity in the overflow is 50ppm, and calcium sulfate concentration ...

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Abstract

The invention provides a scandium extraction pretreatment system, and a treatment method for a scandium-containing solution. The scandium extraction pretreatment system comprises a hardening and tempering part provided with a first inlet, a second inlet and a hardening and tempering liquid outlet, an aging and settling part, a fixed bed and a first transfer pump, wherein the first inlet is used for inputting the scandium-containing solution, the second inlet is used for inputting concentrated sulfuric acid, and the hardening and tempering liquid outlet is used for outputting hardening and tempering liquid; the aging and settling part is provided with a first overflow port, a first liquid inlet and a first slag discharging port which are distributed from top to bottom, and the first liquid inlet communicates with the hardening and tempering liquid outlet; the fixed bed is provided with a second liquid inlet, a second overflow port and a second slag discharging port which are distributed from top to bottom, and the second liquid inlet communicates with the first overflow port; and both the first slag discharging port and the second slag discharging port communicate with the first transfer pump. By adopting the scheme, the content of solid particles in the scandium-containing solution can be effectively reduced, and the aging and settling process is completed; a plurality of tanks are not needed, and the equipment investment is low; and the production cycle of a product is shortened.

Description

technical field [0001] The invention relates to the field of scandium extraction pretreatment, in particular to a scandium extraction pretreatment system and a treatment method for scandium-containing solution. Background technique [0002] Scandium is very dispersed in the earth's crust and is a typical scattered metal element. Due to the very low content of scandium in minerals, scandium can only be comprehensively recovered and enriched, separated and extracted from raw materials with complex composition. At present, scandium enriched in uranium thorium ore, laterite nickel ore, bauxite, ilmenite, zircon placer and other by-products is an industrially significant scandium resource in nature. [0003] In the process of extracting scandium from laterite nickel ore, the temperature of the scandium-containing solution entering the extraction process is relatively high, reaching 50-60°C, and contains supersaturated calcium sulfate and a small amount of solid particles. If it ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B59/00C22B3/02C22B3/22C22B3/26
CPCC22B59/00C22B3/22C22B3/02Y02P10/20
Inventor 邱爽王玮玮唐建文杜国山周文龙覃波
Owner CHINA ENFI ENGINEERING CORPORATION
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