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Method for separating and recovering valuable metal iron, manganese and scandium from tungsten slag

A technology for separation and recovery of valuable metals, applied in the field of manganese and scandium, tungsten slag treatment, separation and recovery of valuable metal iron, can solve the problems of human and environmental impact, and achieve environmental protection, high leaching efficiency, and efficient separation and recovery Effect

Active Publication Date: 2018-12-18
肇庆市珈旺环境技术研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

my country's tungsten smelting slag is usually disposed of by stockpiling, but it contains elements such as residual alkali and toxic metal arsenic. If it is not treated, it will have a huge impact on people and the environment. At present, tungsten slag has been listed as hazardous solid waste ranks

Method used

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  • Method for separating and recovering valuable metal iron, manganese and scandium from tungsten slag
  • Method for separating and recovering valuable metal iron, manganese and scandium from tungsten slag
  • Method for separating and recovering valuable metal iron, manganese and scandium from tungsten slag

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Use 0.5mol / L, 1mol / L, 2mol / L, 3mol / L, 4mol / L, 5mol / L sulfuric acid solution to leach iron, manganese, and scandium in tungsten slag respectively. The temperature during the leaching process is controlled at 90°C. , the liquid-solid ratio is 5:1, the leaching time is 5h and a certain stirring rate is maintained. After taking the supernatant and diluting it by a certain number of times, analyze the iron, manganese and scandium content in the solution. The analytical instrument is ICP-OES, which is diluted 100 times when analyzing iron, 100 times when analyzing manganese, and 20 times when analyzing scandium. The leaching rate of each element is shown in Table 1.

[0035] Table 1 Effect of different concentrations of sulfuric acid on the leaching rate of valuable metals in tungsten slag

[0036] Sulfuric acid concentration (mol / L)

[0037] It can be seen from Table 1 that at 90°C, the liquid-solid ratio is 5:1. As long as the concentration of sulfuric acid is ...

Embodiment 2

[0039] Respectively adopt 10%, 20%, 30%, 40% and 50% volume fraction of P204 as the extractant to extract iron, manganese, scandium in the leachate. During the extraction process, the control ratio was 1:5, the extraction temperature was 25°C, and the extraction time was 10 minutes. After static phase separation, take the raffinate and dilute it by a certain number of times to analyze the content of iron, manganese and scandium. The analytical instrument is ICP-OES. The extraction rate of each metal was calculated by subtraction method. The results are shown in Table 2.

[0040] Table 2 Effects of different extractant concentrations on the extraction rate of valuable metals in the leachate

[0041]

[0042]

[0043] It can be seen from Table 2 that with the increase of the P204 extractant concentration, the extraction rates of the three metal ions increased significantly. When the extractant concentration reached 30%, the scandium extraction rate was close to 100%, an...

Embodiment 3

[0045] Adopt 2mol / L respectively, the sulfuric acid solution of 7mol / L and the ammoniacal solution of 2mol / L selectivity back-extracts the iron in the loading organic phase, manganese, scandium. The ratio of stripping manganese is 5:1, the ratio of stripping iron is 2:1, and the ratio of stripping scandium is 10:1. The stripping temperature is 25° C., and the stripping time is 30 minutes. The order of selective stripping is manganese>iron>scandium. After phase separation, the stripping solution is removed to analyze the metal content in the stripping solution, and the stripping rate of each metal is calculated by subtraction method. The analysis instrument is ICP-OES. The analysis results are shown in Table 3.

[0046] The stripping rate of each metal of table 3 different stripping agents selective stripping stripping

[0047] stripping agent

[0048] As can be seen from Table 3, the stripping of manganese can be realized with sulfuric acid of lower concentration, ...

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Abstract

The invention discloses a method for separating and recovering valuable metal iron, manganese and scandium from tungsten slag. The method includes the steps that the tungsten slag is leached with sulfuric acid; valuable metals such as the iron, the manganese and the scandium exist in a leaching solution as Fe<3+>, Mn<2+> and Sc<3+> correspondingly; the Fe<3+>, the Mn<2+> and the Sc<3+> are simultaneously extracted by a P204+ sulfonated kerosene organic phase, the extraction rates are 97%, 95% and 99% correspondingly, and then the manganese, the iron and the scandium in a loaded organic phase are separated and recovered by selective reverse extraction in sequence by using different reverse extraction agents. According to the method, the process is simple, the recovery rate of the valuable metals is high, and the defects such as big acid mist and bad environment in the process of hydrochloric acid leaching are overcome.

Description

technical field [0001] The invention relates to a method for treating tungsten slag, in particular to a method for separating and recovering valuable metals iron, manganese and scandium from tungsten slag; in particular, it relates to leaching valuable metals in tungsten slag by using sulfuric acid, and extracting iron and manganese with extractant P204 and scandium, and using different stripping agents to selectively strip and recover various metals, which belongs to the field of chemical metallurgy inorganic matter purification and the field of efficient recycling of secondary resources. Background technique [0002] In the 1960s, my country began to smelt metal tungsten. Over the past 60 years, the stockpile of tungsten slag has reached 3.115 million tons. Most of the tungsten ores in our country are leached by alkaline, and the compounds of iron, manganese and scandium are insoluble in the alkaline solution and enter the tungsten smelting slag. The content of iron and m...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B3/08C22B3/38C22B59/00C22B47/00
CPCC22B3/08C22B7/007C22B7/04C22B47/00C22B59/00C22B3/3846Y02P10/20
Inventor 侯浩波李政家梁安娜雷杰妮何雯婧罗腾
Owner 肇庆市珈旺环境技术研究院
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