A kind of method for extracting rubidium in fly ash

A fly ash and leaching technology, which is applied in the field of extracting rubidium from fly ash and recycling fly ash, can solve the problems of a large amount of strong alkaline wastewater environment, increase production cost, pollution, etc., and avoid the generation of a large number of low-value by-products , reduce the amount of use, reduce the effect of side effects

Active Publication Date: 2021-06-15
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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  • A kind of method for extracting rubidium in fly ash

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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 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 1.2:1;

[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 kerosen...

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 in fly ash, comprising the following steps: using a leaching agent to leach the fly ash, and separating the solid and liquid to obtain the leach residue and the leachate with a pH value of 11-13.5; mixing sodium carbonate and the leachate, and precipitating After complete solid-liquid separation, the precipitated residue and the precipitated liquid are obtained; the precipitated liquid is extracted with an extractant, and the liquid is separated to obtain the rubidium-containing organic phase and the first aqueous phase; the rubidium-containing organic phase is washed to obtain the extracted phase and the second aqueous phase ; Using a stripping agent to back-extract the extraction phase and separate the liquids to obtain a rubidium-containing concentrated solution and a back-extracted organic phase. The invention leaches the fly ash without adjusting the pH value of the leaching solution, which reduces the alkali consumption; and by selecting a specific leaching agent and extraction agent, adding sodium carbonate to the leaching solution and washing and extracting the organic phase, the extraction of rubidium is improved. The rate reaches 52.57%, and the separation factor of rubidium and potassium reaches 22, which increases the added value of fly ash resource utilization and provides a new idea for the comprehensive utilization of 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 Patents(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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