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Method for extracting rubidium from fly ash

A fly ash and leaching technology is applied in the field of extracting rubidium in fly ash and recycling fly ash. The effect of avoiding the production of a large number of low-value by-products

Active Publication Date: 2019-09-13
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This process will produce a large amount of strong alkaline wastewater and cause serious environmental pollution, greatly increasing production costs

Method used

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  • Method for extracting rubidium from fly ash

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Effect test

Embodiment 1

[0068] The present embodiment provides a method for extracting rubidium in fly ash, said method comprising the steps of:

[0069] (1) use the aqueous solution of 0.8% sodium dimethyl dithiocarbamate to leach fly ash for 2h at room temperature, the liquid-solid ratio of the aqueous solution of sodium dimethyl dithiocarbamate and fly ash is 5: 1. Solid-liquid separation to obtain leach residue and leachate with a pH value of 12;

[0070] (2) mixing sodium carbonate and step (1) gained leaching solution, solid-liquid separation after precipitation is complete, obtain precipitation slag and precipitation liquid, the mass ratio of described sodium carbonate and fly ash is 1.5:1;

[0071] (3) Use an extractant to extract the precipitated liquid obtained in step (2) for 5h at room temperature, and separate the liquids to obtain an organic phase containing rubidium and the first aqueous phase. The extractant is a mixture of t-BAMBP and sulfonated kerosene Organic solution, the concen...

Embodiment 2

[0075] The present embodiment provides a method for extracting rubidium in fly ash, said method comprising the steps of:

[0076] (1) Use an aqueous solution of sodium diethyldithiocarbamate with a mass fraction of 0.5 to leach fly ash for 5 hours at room temperature, and the liquid-solid ratio of the aqueous solution of sodium diethyldithiocarbamate to fly ash is 10:1 , solid-liquid separation to obtain leach slag and leachate with a pH value of 11.5;

[0077] (2) mixing sodium carbonate and step (1) gained leachate, solid-liquid separation after precipitation is complete, obtain precipitation slag and precipitation liquid, the mass ratio of described sodium carbonate and fly ash is 1.2:1;

[0078] (3) Use an extractant to extract the precipitated liquid obtained in step (2) for 6 hours at room temperature, and separate the liquids to obtain an organic phase containing rubidium and the first aqueous phase. The extractant is a mixture of t-BAMBP and sulfonated kerosene Organi...

Embodiment 3

[0082] The present embodiment provides a method for extracting rubidium in fly ash, said method comprising the steps of:

[0083] (1) Use the aqueous solution of 1% polyethyleneimine dithiocarbamate to leaching fly ash at room temperature for 6 hours, the aqueous solution of polyethyleneimine dithiocarbamate and fly ash The liquid-solid ratio is 4:1, the solid-liquid is separated, and the leach residue and the leachate with a pH value of 12.5 are obtained;

[0084] (2) mixing sodium carbonate and step (1) gained leaching solution, solid-liquid separation after precipitation is complete, obtain precipitation slag and precipitation liquid, the mass ratio of described sodium carbonate and fly ash is 1.8:1;

[0085] (3) Use an extractant to extract the precipitated liquid obtained in step (2) for 2 hours at room temperature, and separate the liquids to obtain an organic phase containing rubidium and the first aqueous phase. The extractant is an organic compound formed by mixing t-...

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Abstract

The invention provides a method for extracting rubidium from fly ash. The method comprises the following steps that a leaching agent is used for leaching the fly ash, solid-liquid separation is carried out, and leaching slag and leaching liquid with the pH value being 11-13.5 are obtained; sodium carbonate and the leaching liquid are mixed, solid-liquid separation is carried out after precipitation is completely carried out, and precipitation slag and precipitation liquid are obtained; an extraction agent is used for extracting the precipitation liquid, liquid dividing is carried out, and a rubidium-containing organic phase and a first aqueous phase are obtained; the rubidium-containing organic phase is washed to obtain an extraction phase and a second aqueous phase; and a reverse extraction agent is used for conducting reverse extraction on the extraction phase, liquid separating is carried out, and a rubidium-containing concentrated solution and a reverse extraction organic phase areobtained. According to the method, the fly ash is leached, the pH value of the leaching liquid does not need to be adjusted, and the alkali consumption is reduced; by selecting the specific leachingagent and the specific extraction agent, adding the sodium carbonate in the leaching liquid and conducting washing extraction on the organic phases, the rubidium extracting ratio is 52.57%, and the rubidium and potassium separation coefficient is 22, the fly ash resource utilization additional value is increased, and a new idea is provided for comprehensive utilization of the fly ash.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and relates to a method for recycling fly ash, in particular to a method for extracting rubidium in fly ash. Background technique [0002] After incineration of domestic waste, fly ash enriched with various heavy metals will be produced. In order to reduce the harm of fly ash to the environment, in the prior art, fly ash is often stabilized and then landfilled or treated as cement raw material. [0003] CN 108036323 A discloses a system and method for making ecological cement by co-combusting garbage fly ash and sludge in a cement kiln, including a sludge pretreatment unit, a garbage fly ash storage unit, a batching storage unit, a material mixing system, an incineration device, a cooked Material storage device, cement kiln system; the incineration device is equipped with an air lock feeder, a vertical incinerator, an air lock valve, and a chain plate discharger in sequence. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B26/10C22B3/26
CPCC22B7/008C22B26/10C22B3/262Y02P10/20
Inventor 童立志胡清肖锐杰唐一胡滨王峰韦黎华
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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