Method for conducting synergistic solidification stabilization on arsenic in desulphurization gypsum by using high temperature of waste incineration fly ash

A waste incineration fly ash and desulfurization gypsum technology is applied in the field of solidification and stabilization of arsenic in desulfurization gypsum, and the field of preparation of desulfurization gypsum can solve the problems of high cost of chelation stabilization, large energy consumption, and increased storage capacity of landfills. Reduced mobility, good inhibitory effect, and the effect of realizing high-temperature synergistic and stable resource utilization

Inactive Publication Date: 2018-08-28
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, washing and pickling not only produces a large amount of heavy metal wastewater, but the fly ash after washing still needs further disposal; solidification and stabilization use a large amount of cement, asphalt and other materials, which increases the storage capacity consumption of landfills; The stability is debatable; during high...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] In this embodiment, a method for stabilizing arsenic in desulfurized gypsum by high-temperature synergistic solidification of waste incineration fly ash includes the following steps:

[0021] a. According to the solid-to-liquid ratio of waste incineration fly ash, 100g of waste incineration fly ash from a waste incineration plant in Shanghai was rinsed twice with 300ml of tap water. The ash is subjected to suction filtration treatment, and the moisture content is controlled at 50wt.%, to obtain wet fly ash;

[0022] b. Using waste incineration fly ash as an additive, take 15g of the wet fly ash obtained in step a, add it to 100g of desulfurized gypsum, fully stir for 15min, and then maintain for 3h to obtain a mixed wet material of desulfurized gypsum mixed with fly ash;

[0023] c. Put the desulfurized gypsum mixed wet material doped with fly ash obtained in the step b into a gypsum product mold, place it in a muffle furnace, and perform high-temperature calcination at...

Embodiment 2

[0030] This embodiment is basically the same as Embodiment 1, especially in that:

[0031] In this embodiment, a method for stabilizing arsenic in desulfurized gypsum by high-temperature synergistic solidification of waste incineration fly ash includes the following steps:

[0032] a. According to the solid-to-liquid ratio of waste incineration fly ash, 100g of waste incineration fly ash from a waste incineration plant in Shanghai and 300ml of tap water were subjected to countercurrent rinsing for the second time. The rinsing time of each stage was 10 minutes. The ash is subjected to suction filtration treatment, and the moisture content is controlled at 80wt.%, to obtain wet fly ash;

[0033] b. Using waste incineration fly ash as an additive, take 15g of the wet fly ash obtained in step a, add it to 100g of desulfurized gypsum, fully stir for 15min, and then maintain for 3h to obtain a mixed wet material of desulfurized gypsum mixed with fly ash;

[0034] c. Put the desulfu...

Embodiment 3

[0037] This embodiment is basically the same as the previous embodiment, and the special features are:

[0038]In this embodiment, a method for stabilizing arsenic in desulfurized gypsum by high-temperature synergistic solidification of waste incineration fly ash includes the following steps:

[0039] a. According to the solid-to-liquid ratio of waste incineration fly ash, 100g of waste incineration fly ash from a waste incineration plant in Shanghai and 200ml of tap water were subjected to countercurrent rinsing for the second time. The rinsing time of each stage was 15 minutes. The ash is subjected to suction filtration treatment, and the moisture content is controlled at 50wt.%, to obtain wet fly ash;

[0040] b. Using waste incineration fly ash as an additive, take 10 g of the wet fly ash obtained in step a, add it to 100 g of desulfurized gypsum, fully stir for 15 minutes, and then maintain for 3 hours to obtain a mixed wet material of desulfurized gypsum mixed with fly a...

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Abstract

The invention discloses a method for conducting synergistic solidification stabilization on arsenic in desulphurization gypsum by using high temperature of waste incineration fly ash. The method includes the steps of conducting two-time countercurrent rinsing on the waste incineration fly ash according to the solid-to-liquid ratio of 1:(2-6) to obtain wet fly ash, wherein the rinsing time of eachsection is 10-15 min; adding the wet fly ash into the desulphurization gypsum according to the ratio that the dry basis of the wet fly ash accounts for 5-12wt.% of the desulphurization gypsum, fully stirring, then conducting maintenance for at least 3 h, and obtaining a desulphurization-gypsum-mixed wet material doped with the fly ash; placing the desulphurization-gypsum-mixed wet material into agypsum product die, conducting high-temperature calcination for 30-60 min at 600-800 DEG C, and obtaining a calcinated gypsum material product. According to the method, by using the hydration processof the cement base component of the fly ash, solidification stabilization wrapping is conducted on the free arsenic in the gypsum, the arsenic in the desulphurization gypsum is solidified and stabilized, the hypotoxic desulphurization gypsum is prepared, the safety of gypsum-derivative building material products is ensured, and environmental pollution is reduced.

Description

technical field [0001] The invention relates to a method for preparing desulfurized gypsum, in particular to a method for solidifying and stabilizing arsenic in desulfurized gypsum, which is applied in the technical field of gas emission control environmental engineering, and in the technical field of waste recycling and reduction of toxic substances . Background technique [0002] Desulfurization gypsum is also known as flue gas desulfurization gypsum, sulfur gypsum or FGD gypsum. The main component is the same as natural gypsum, calcium sulfate dihydrate CaSO 4 2H 2 O, content ≥ 93%. Desulfurization gypsum is a by-product of the FGD process, a technology that uses lime-limestone to recover sulfur dioxide from coal or oil flue gas. The technology is to grind the lime-limestone into a slurry, so that the SO-containing 2 The flue gas passes through the slurry scrubber to remove SO 2 . Lime slurry and SO 2 The reaction produces calcium sulfate and calcium sulfite, and t...

Claims

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Application Information

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IPC IPC(8): C04B11/26C04B11/024
CPCC04B11/024C04B11/264
Inventor 潘赟岳阳刘自兴郝莹王梦菲
Owner SHANGHAI UNIV
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