Method for preparing potassium ferrate and cementing material from waste incineration fly ash and iron tailings

A technology for waste incineration fly ash and potassium ferrate, applied in chemical instruments and methods, iron compounds, cement production, etc. high coagulation activity

Pending Publication Date: 2022-05-24
CHANGSHU INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Domestic waste incineration fly ash and iron tailings are complementary in composition, which is very conducive to the synergistic production of high value-added products, but there is no research report on the synergistic utilization of the two

Method used

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  • Method for preparing potassium ferrate and cementing material from waste incineration fly ash and iron tailings
  • Method for preparing potassium ferrate and cementing material from waste incineration fly ash and iron tailings
  • Method for preparing potassium ferrate and cementing material from waste incineration fly ash and iron tailings

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Effect of mass ratio of iron tailing powder and waste incineration fly ash on potassium ferrate conversion rate, chlorine removal rate and cementing activity of cementitious materials

[0021] Preparation of potassium ferrate and cementitious materials: such as figure 1 As shown, according to the mass ratio of 0.25:1, 0.35:1, 0.45:1, 0.5:1, 1.0:1, 1.5:1, 1.6:1, 1.8:1, 2.0:1, iron tailings powder and garbage were respectively The incineration fly ash is mixed, and water is added to stir evenly to obtain a mixed slurry of fly ash and iron tailings, wherein the liquid-solid ratio of water, iron tailings powder and the mixture of waste incineration fly ash is 1:1 mL / g; Placed in the anode chamber of the electrolytic cell, start the DC power supply to carry out electrolysis for 5 hours, wherein the current threshold is set to 50A, and the voltage threshold is set to 20V. The catholyte; the electrolytic oxidation slurry was centrifuged and filtered to obtain ferrate crude so...

Embodiment 2

[0033] Effect of volume ratio of potassium hydroxide solution, potassium carbonate solution and crude ferrate solution on potassium ferrate iron conversion rate, chlorine removal rate and gelation activity of gelling materials

[0034] Preparation of potassium ferrate and cementitious material: according to the mass ratio of 1.5:1, the iron tailings powder and the waste incineration fly ash are mixed, and water is added to stir evenly to obtain a mixed slurry of fly ash iron tailings, in which water, iron tailings powder and The liquid-solid ratio of the waste incineration fly ash mixture is 2:1 mL / g; the fly ash iron tailings mixed slurry is placed in the anode chamber of the electrolytic cell, and the DC power supply is turned on for electrolysis for 3 hours. The current threshold is set to 550A, and the voltage threshold is set to 110V, after the electrolysis, the electrolytic oxide slurry and the electrolyzed catholyte were obtained from the anode chamber and the cathode ch...

Embodiment 3

[0040] Effect of activation temperature on potassium ferrate iron conversion rate, chlorine removal rate and gelation activity of cementitious materials

[0041] Preparation of potassium ferrate and cementitious material: according to the mass ratio of 1.5:1, the iron tailings powder and the waste incineration fly ash are mixed, and water is added to stir evenly to obtain a mixed slurry of fly ash iron tailings, in which water, iron tailings powder and The liquid-solid ratio of the waste incineration fly ash mixture is 3:1 mL / g; the fly ash-iron tailings mixed slurry is placed in the anode chamber of the electrolytic cell, and the DC power supply is started for electrolysis for 1 hour, where the current threshold is set to 1050A, and the voltage threshold is set to 200V, after the electrolysis is completed, the electrolytic oxide slurry and the electrolyzed catholyte are respectively obtained from the anode chamber and the cathode chamber of the electrolytic cell; the electroly...

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Abstract

The invention discloses a method for preparing potassium ferrate and a cementing material by using waste incineration fly ash and iron tailings, which comprises the following steps: (1) mixing iron tailings powder and waste incineration fly ash, and adding water to obtain fly ash and iron tailings mixed slurry; (2) the fly ash iron tailing mixed slurry is placed in an anode chamber of an electrolytic cell, a power supply is switched on for electrolysis, and after electrolysis is finished, electrolytic oxidation slurry and electrolyzed catholyte are obtained in the anode chamber and the cathode chamber of the electrolytic cell respectively; (3) centrifuging and filtering the electrolytic oxidation slurry to obtain a ferrate radical crude solution and acidic iron plaster; (4) mixing and stirring a potassium hydroxide solution, a potassium carbonate solution and the crude ferrate solution, and filtering to obtain a potassium ferrate solution and carbonate filter residues; and (5) uniformly mixing the electrolyzed catholyte, the acidic iron plaster and the carbonate filter residues, drying and activating to obtain the cementing material. According to the invention, the potassium ferrate and the cementing material are prepared by synergistically utilizing the waste incineration fly ash and the iron tailings, so that resource utilization of hazardous wastes is realized.

Description

technical field [0001] The invention relates to the resource recycling of solid waste, in particular to a method for preparing potassium ferrate and a cementitious material by utilizing waste incineration fly ash and iron tailings. Background technique [0002] Iron tailings belong to solid waste, which is the solid waste remaining after iron ore is selected and extracted. China's iron ore reserves and iron and steel production rank among the top in the world, and a large amount of iron tailings are produced every year. If iron tailings are left to be piled up directly in the natural environment, it will have a serious environmental impact on the soil and water bodies around the mining area. The comprehensive utilization of iron tailings is the direction strongly advocated by the country. Because iron tailings contain a lot of SiO 2 , Al 2 O 3 , Fe x O y Minerals, which are widely used in the production of cement concrete, aerated concrete, roadbed materials, glass-ce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00C25B1/16C25B1/26C25B9/60C04B7/24
CPCC01G49/00C25B1/26C25B1/16C25B9/60C04B7/24Y02P40/10
Inventor 黄涛宋东平张树文徐娇娇
Owner CHANGSHU INSTITUTE OF TECHNOLOGY
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