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Method for removing and recycling pollutants in fly ash

A technology for pollutants and recycling, applied in the field of environmental engineering, can solve the problems that restrict the development and application of complete sets of treatment technologies for fly ash harmlessness and recycling

Active Publication Date: 2021-05-14
江苏智诚达环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, methods such as cement solidification, melting and sintering, mechanochemistry, evaporative crystallization, flocculation and ion exchange have been widely studied, but none of the above treatment methods can meet the requirements of fly ash harmlessness and resource utilization in terms of economy, environmental protection and feasibility. processing needs
In addition, the lack of high-efficiency, low-cost removal and effective resource recovery technologies for heavy metals and dioxins enriched in fly ash also seriously restricts the development and application of fly ash harmless and resource-based complete sets of treatment technologies

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Anode electrode preparation: thickness 1mm, surface area 5×5cm 2The titanium substrate was placed in 0.5mol / L oxalic acid aqueous solution, reacted in a water bath at 80°C for 6h, took out the electrode and ultrasonicated it in deionized water for 60min, and then dried it in an oven at 60°C for use. Ruthenium chloride and iridium chloride (molar ratio 8:1) were dissolved in 1L of deionized water, ultrasonically dispersed for 1 h, and deoxygenated in vacuum for 30 min. Then put the titanium substrate and the ruthenium-iridium mixed solution in a nitrogen atmosphere glove box, adjust the temperature of the plate heater to 900°C, heat the titanium substrate for 1 min, and then quickly place the heated titanium substrate in the ruthenium-iridium mixed solution, After standing still for 5s, taking out and washing with water and drying, this process was repeated 4 times to obtain a titanium substrate with a Ru-Ir layer. Place the titanium substrate with the Ru-Ir layer in a ...

Embodiment 2

[0022] Anode electrode preparation: thickness 1mm, surface area 5×5cm 2 The titanium substrate was placed in 1mol / L oxalic acid aqueous solution, reacted in a water bath at 80°C for 8h, took out the electrode and ultrasonicated it in deionized water for 60min, and then dried it in an oven at 60°C for use. Ruthenium chloride and iridium chloride (9:1 molar ratio) were dissolved in 1L of deionized water, ultrasonically dispersed for 1 h, and deoxygenated in vacuum for 30 min. Then put the titanium substrate and the ruthenium-iridium mixed solution in a nitrogen atmosphere glove box, adjust the temperature of the plate heater to 900°C, heat the titanium substrate for 1 min, and then quickly place the heated titanium substrate in the ruthenium-iridium mixed solution, After standing still for 5s, taking out and washing with water and drying, the process was repeated 10 times to obtain a titanium substrate with a Ru-Ir layer. Put the titanium substrate with Ru-Ir layer in a vacuum ...

Embodiment 3

[0025] Fly ash recycling method: Take 50g of fly ash and wash it twice with water to remove dioxins and heavy metals. The washing conditions are room temperature 25°C, stirring and washing time 10min, and the solid ratio of the washing solution is 5:1 (mL:g). After the first washing solution is filtered at high speed, flocculation and precipitation are carried out, and anhydrous Na 2 CO 3 Until no more precipitation occurs, filter to obtain light CaCO 3 , with a purity of 97%, it can be used as a filler in industries such as plastics, papermaking, coatings and inks. The water from the second washing is reused in the first washing step of the unwashed fly ash, and the washing liquid is filtered at high speed and then added with Na 2 CO 3 Light CaCO 3 , and mix the washing solutions of the above two-stage washing. Through liquid chromatography and inductively coupled plasma spectroscopy tests, the total inorganic salt ion content of the leaching solution of fly ash washed t...

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Abstract

The invention provides an electrochemical redox system capable of synchronously and efficiently removing organic pollutants and heavy metal ions in a high-salt and high-chlorine water body, forms a whole set of efficient fly ash resource recycling method on the basis of the electrochemical redox system, and belongs to the technical field of environmental pollution control engineering. According to the method, a Ti4O7 anode with a ruthenium-iridium intermediate layer is prepared by combining a quenching method (for preparing the intermediate layer) and a plasma spraying method (for preparing an ultrathin catalyst layer), the Ti4O7 anode and a hastelloy electrode (cathode) form the electrochemical redox system, thus organic pollutants such as dioxin in fly ash washing liquid can be degraded and mineralized in a high-salt and high-chlorine environment, and heavy metal ions are fixed at the cathode through a reduction effect, so that the aim of reducing TOC and heavy metal content of the washing liquid is fulfilled. The electrode preparation method involved in the method is simple and convenient, low in cost and easy for large-scale production; and the harmless and recycling method for the fly ash is reasonable in design, and the recycling rate of each component is high.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and relates to the research on the harmlessness and resource utilization of fly ash produced by waste incineration, and in particular to the preparation of electrodes and the construction of an electrochemical degradation system applied to the efficient removal of toxic pollutants in fly ash, and hereby On the basis of this, an innovation in the recovery and utilization method of each component in the whole set of fly ash is formed. Background technique [0002] With population growth and social development, the amount of domestic waste in my country is increasing rapidly, and on this basis, the composition and structure of waste are also constantly changing, which seriously affects the safety of my country's ecological environment and sustainable economic development. Due to the shortage of land resources in our country, the landfill method is gradually being replaced by high-t...

Claims

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Application Information

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IPC IPC(8): B09B3/00B09B5/00C23C4/134C23C4/137C23C4/11C23C18/54C25C7/02C23C28/00A62D3/115
CPCB09B3/00B09B5/00C23C4/134C23C4/137C23C4/11C23C18/54C25C7/02C23C28/321C23C28/3455A62D3/115A62D2101/49A62D2101/24
Inventor 牛连勇
Owner 江苏智诚达环保科技有限公司
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