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A process for extracting scandium from gas ash

A technology of gas ash and process, which is applied in the field of extracting scandium from gas ash, can solve the problems that are not conducive to recycling, achieve strong economic value, simple processing method and obvious effect

Inactive Publication Date: 2018-01-12
KUNMING METALLURGY INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the acid solution contains a large amount of impurity metals, or the acid solution contains high acidity, it is not conducive to the recovery of valuable metals.

Method used

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  • A process for extracting scandium from gas ash

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Experimental program
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Effect test

Embodiment 1

[0032] Atmospheric pressure leaching Ⅰ acid concentration: sulfuric acid 100g / L, leaching time 30min, leaching at room temperature, liquid-solid ratio 1.5:1, leaching rate 31.50%; 10min, the reduction temperature is normal temperature, the reduction rate is 30.52%; the leachate is precipitated with gas mud (ash), the dosage is 10g / L, the precipitation temperature is normal temperature, the precipitation time is 30min, the scandium content can be enriched to 16.3 times, and the precipitation rate is 86.19%; the obtained precipitated residue Sulfuric acid leaching, leaching at room temperature, leaching time 30min, leaching liquid-solid ratio 1.5:1, acid concentration 100g / L, leaching rate 91.50%; leaching liquid is extracted at room temperature with P204, diluent is kerosene, extraction agent concentration is 5%, extraction grade The number is level 1, the extraction time is 1min, the extraction ratio O / A is 1:3, and the extraction rate is 98.26%. The O / A ratio is 3:1, the stri...

Embodiment 2

[0034] Atmospheric pressure leaching Ⅰ acid concentration: hydrochloric acid 200g / L, leaching time 180min, leaching temperature 60°C, liquid-solid ratio 3:1, leaching rate: 65.26%; the obtained leaching solution is reduced with zinc sulfide concentrate, and the amount of reducing agent is 3g / L , the reduction time is 120min, the reduction temperature is 60°C, the reduction rate is 48.37%; the leachate is precipitated with gas mud (ash), the dosage is 30g / L, the precipitation is at 60°C, the precipitation time is 50min, the scandium content can be enriched to 13.4 times, and the precipitation rate is 53.46% The obtained precipitated residue was leached with hydrochloric acid, the leaching temperature was 70°C, the leaching time was 180min, the leaching liquid-solid ratio was 3:1, the acid concentration was 200g / L, and the leaching rate was 87.36%; The extraction ratio is 20%, the extraction stage is 3, the extraction time is 3min, the extraction ratio O / A is 1:3, and the extract...

Embodiment 3

[0036] Atmospheric pressure leaching Ⅰ acid concentration: sulfuric acid 300g / L, leaching time 300min, leaching temperature 90°C, liquid-solid ratio 8:1, leaching rate: 54.69%; the obtained leaching solution is reduced with zinc sulfide concentrate, and the amount of reducing agent is 20g / L , reduction time 240min, reduction at 90°C, reduction rate 40.81%; leachate was precipitated with gas mud (ash), dosage 100g / L, precipitation at 90°C, precipitation time 120min, scandium content can be enriched to 15.8 times, precipitation rate 83.25% The obtained precipitated residue is leached with hydrochloric acid, the leaching temperature is 90°C, the leaching time is 300min, the leaching liquid-solid ratio is 8:1, the acid concentration is 300g / L, and the leaching rate is 93.92%; is 40%, the extraction stage is 7, the extraction time is 7min, the extraction ratio O / A is 1:8, and the extraction rate is 93.17%; the scandium-loaded organic phase is back-extracted with hydrochloric acid at...

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Abstract

The invention discloses a new process for comprehensively recovering scandium in gas ash by using waste acid. The waste acid for scandium-contained gas ash is filtered after normal-pressure leaching I; solution obtained by filtering is neutralized by the scandium-contained gas ash after being reduced by reducing agent; obtained neutralized slag is leached at normal pressure by the waste acid; and extraction, back extraction, and precipitation by adopting oxalic acid are performed on the filtrate obtained by leaching to obtain scandium oxalate. The new process treats the gas ash through the waste acid, that is, wastes are used, high-value elements are recovered, and the economic value is high; and meanwhile, the process conditions are easy to realize, the scandium is enriched and recovered, metal such as zinc and iron in the gas ash is recovered, and the comprehensive resource utilization of the gas ash in a blast furnace is realized. The new process is simple in treatment method, obvious in effect and high in popularization significance.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of solid waste resources, and specifically relates to a wet process. The process proposes a new process for comprehensively recovering scandium, a rare earth metal in gas ash. The process uses waste acid to treat the gas ash, and after two leaching , Once neutralized and precipitated, the scandium and zinc in the gas ash can be separated and extracted, and the comprehensive utilization of gas ash and waste acid resources has been realized by using waste to waste. Background technique [0002] Blast furnace gas ash is the excrement from blast furnace ironmaking. During the blast furnace smelting process, light impurities such as zinc, aluminum, and lead contained in iron ore raw materials are reduced under high temperature conditions and form steam, which is discharged with blast furnace gas together with dust particles such as ore, coke, and flux. Or dry dust removal system captures and r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B59/00
CPCC22B7/007C22B59/00Y02P10/20
Inventor 彭秋燕杨大锦王少龙于站良谢天鉴刁微之刘俊场
Owner KUNMING METALLURGY INST
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