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Method for extracting rubidium and cesium from steel soot and/or volatile dust

A soot and steel technology, applied in the field of rubidium and cesium extraction, can solve the problems of high cost, high toxicity of iodine chloride, complex process, etc., achieve efficient recovery and high efficiency, increase the amount of rubidium and cesium resources, and avoid the effect of impact

Active Publication Date: 2020-02-25
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method utilizes the characteristics of iodine chloride and rubidium and cesium to form precipitates, but iodine chloride is highly toxic and expensive, but the second stage still uses BAMBP for extraction, which is a complicated process

Method used

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  • Method for extracting rubidium and cesium from steel soot and/or volatile dust

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] The method that the present invention extracts rubidium and cesium is as follows:

[0071] (1) Add water to the iron and steel dust containing 0.05% rubidium and 0.02% cesium and stir to leach, filter after 10 minutes to obtain a filtrate, continue to add new iron and steel dust to the filtrate and stir to leach. Repeat the above operation (countercurrent leaching) until the cesium content in the leaching solution is not less than 0.2g / L. Add sodium bicarbonate solution to the leaching solution until no precipitation occurs, filter to remove the precipitation, then adjust the pH of the leaching solution to 14 with sodium hydroxide solution, and filter again to make heavy metals and calcium and magnesium impurities form carbonates and hydroxides. The solid was separated to obtain a leach solution containing rubidium and cesium. After analysis, the content of rubidium in the leach solution containing rubidium and cesium was 0.48g / L, and the content of cesium was 0.2g / L. ...

Embodiment 2

[0079] The method that the present invention extracts rubidium and cesium is as follows:

[0080] (1) After the iron and steel dust is volatilized by the rotary kiln, the secondary zinc oxide powder is obtained. After leaching with aqueous sodium carbonate solution, an aqueous solution containing 0.98g / L of rubidium and 0.55g / L of cesium is obtained, in which the content of lead is 4.5mg / L and the content of cadmium is 7.6 mg / L, thallium content 1.8mg / L, zinc content 205mg / L, calcium content 20mg / L, magnesium content 34mg / L. Sodium sulfide solution was added to this solution to precipitate the heavy metals. After the precipitation is separated, a leaching solution containing rubidium and cesium is obtained. After analysis, the content of rubidium in the leach solution containing rubidium and cesium was 0.92g / L, and the content of cesium was 0.52g / L.

[0081] (2) Adjust the pH of the leaching solution containing rubidium and cesium to 12, and extract with BAMBP as the extract...

Embodiment 3

[0088] The method that the present invention extracts rubidium and cesium is as follows:

[0089] (1) The raw material is the soluble salt enrichment obtained by evaporating to dryness after washing water of subzinc oxide (volatile dust) with calcium chloride to remove sulfate radicals and fluoride ions. After analysis, it contains 0.8% rubidium and 0.13% cesium. Add 1% sodium carbonate aqueous solution to the soluble salt enrichment, stir and leach, and filter after 30 minutes to obtain the filtrate. After analysis, the content of rubidium in the leachate containing rubidium and cesium is 3.1g / L, and the content of cesium is 0.51g / L. Among them, the sodium carbonate aqueous solution has both leaching and impurity removal functions.

[0090] (2) Adjust the pH of the leachate containing rubidium and cesium to 14, extract with t-BAMBP as the extractant and kerosene as the diluent, and obtain the raffinate and the loaded organic phase. After the loaded organic phase was washed w...

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Abstract

The invention provides a method for extracting rubidium and cesium from steel soot and / or volatile dust. The method comprises the steps that (1), the steel soot and / or volatile dust and a solvent aremixed to obtain a solution containing rubidium and cesium, purification is carried out through a purifying agent, and leach liquor containing rubidium and cesium is obtained; (2), an extracting agentis used for carrying out extracting on the leach liquor containing rubidium and cesium, rubidium and cesium in a load organic phase are stripped into water through an acidic material, and enrichment liquor is obtained; (3), the enrichment liquor is purified through the purifying agent, and purified enrichment liquor is obtained; and (4), extraction is carried out on the purified enrichment liquorthrough the extracting agent, the load organic phase is washed to remove rubidium through an aqueous solution, then cesium in the washed and rubidium-removed load organic phase is stripped into the aqueous phase through the acidic material, a cesium salt solution is obtained, and residual liquor after extraction and / or a washing water phase are / is a rubidium-rich solution. By means of the method,existing rubidium and cesium resource quantity is greatly expanded, a specific enrichment and purification technology is established, and significant economic value is achieved.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, and in particular relates to a method for extracting rubidium and cesium from steel fume and / or volatile dust. Background technique [0002] As an important alkali metal resource, rubidium and cesium are abundant in the earth's crust, ranking 16th and 40th in terms of element abundance, and mainly occur in solid ores such as lepidolite, cesium garnet, amazonite and geothermal energy. In water, salt lake brine, and seawater, rubidium and cesium in minerals mainly replace potassium atoms in the form of isomorphism. In salt lake brine, rubidium exists accompanied by alkali metal elements with very similar properties such as potassium and sodium. This gives rubidium Separation and purification caused great difficulty. The basic raw materials for the industrial production of rubidium and cesium are mainly cesium garnet and lepidolite, but the extraction process is complex, costly and energy c...

Claims

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Application Information

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IPC IPC(8): C22B7/02C22B26/10
CPCC22B7/007C22B7/02C22B26/10Y02P10/20
Inventor 李建张绘齐涛朱兆武
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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