Ecological synthetic utilization method of fly ash

A fly ash, ecological technology, applied in the field of fly ash ecological comprehensive utilization, can solve the problems of complex process flow, high equipment requirements, large pollution by fluoride solubilization method, etc., and achieves a short process flow and simple operation. Effect

Active Publication Date: 2011-11-16
DONGDA NONFERROUS SOLID WASTE TECH RES INST LIAOLING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the above several types of comprehensive utilization methods of fly ash, the energy consumption of lime sintering method is relatively high (the roasting temperature is higher at 1300 ℃), and the economic benefit is not good; Na 2 CO 3 Na in the sintering process 2 CO 3 The consumption is large and the technological proc

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Experimental program
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Effect test

Embodiment 1

[0028] The main component of fly ash is Al by weight percentage 2 o 3 20%, Fe 2 o 3 25%, SiO 2 50%; the fly ash is ground to below 200 mesh, mixed with a 5% hydrochloric acid solution at a liquid-solid ratio of 40:1L / kg, and then leached at a leaching temperature of 100°C for 120 minutes. Under this condition, the pulverized coal The leaching rate of aluminum element in the ash is 90.35%, and the leaching rate of iron element is 93.2%. 2 The mass content is 92.08%.

[0029] Use tributyl phosphate as extractant, sulfonated kerosene as diluent to separate iron and aluminum elements in the leachate, the volume ratio of organic phase (extractant and diluent) to water is 1:1, diluent in extractant The volume fraction is 70%, extract at normal temperature for 1min, obtain the extract phase and the raffinate phase after extraction, aluminum enters the raffinate extract phase to form an aluminum chloride solution, and iron enters the extract phase; the aluminum chloride soluti...

Embodiment 2

[0036] The main component of fly ash is Al by weight percentage 2 o 3 25%, Fe 2 o 3 40%, SiO 2 30%, the fly ash is ground to below 200 mesh, mixed with 30% hydrochloric acid solution at a liquid-solid ratio of 3:1L / kg, and then leached at a leaching temperature of 180°C for 30 minutes. The leaching rate of aluminum element in coal ash is 97.17%, and the leaching rate of iron element is 96.26%. 2 The mass content is 95.31%.

[0037] Use tributyl phosphate as extractant and sulfonated kerosene as diluent to separate iron and aluminum elements in leachate, the volume ratio of organic phase to water phase is 4:1, and the volume fraction of diluent in extractant is 50% , extract at room temperature for 15 minutes, obtain the extract phase and the raffinate phase after extraction, aluminum enters the raffinate phase to form an aluminum chloride solution, and iron enters the extract phase; the aluminum chloride solution and the extract phase are separated.

[0038] The extra...

Embodiment 3

[0044] The main component of fly ash is Al by weight percentage 2 o 3 30%, Fe 2 o 3 15%, SiO 2 50%, the fly ash is ground to below 200 mesh, mixed with 20% hydrochloric acid solution at a liquid-solid ratio of 10:1L / kg, and then leached for 360min at a leaching temperature of 150°C. Under this condition, the powder The leaching rate of aluminum element in coal ash was 96.44%, and the leaching rate of iron element was 95.19%. After leaching, the leach solution is separated from the leaching residue by filtering, and the SiO in the leaching residue 2 The mass content is 94.17%.

[0045] Use tributyl phosphate as extractant and sulfonated kerosene as diluent to separate iron and aluminum elements in leachate, the volume ratio of organic phase to water phase is 2:1, and the volume fraction of diluent in extractant is 70% , extract at room temperature for 5 minutes, obtain the extract phase and the raffinate phase after extraction, aluminum enters the raffinate phase to form ...

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Abstract

The invention relates to an ecological synthetic utilization method of fly ash, and the method has the following steps: (1) selecting fly ash which contains aluminum oxide, iron oxide and silicon oxide as a raw material, wherein the mass content of aluminum oxide, iron oxide and silicon oxide are respectively 20-45%, 10-40% and 30-50%, performing a fine grinding and then leaching; (2) filtering and separating to obtain a leaching solution and leaching residue; adding tributyl phosphate and a diluent in the leaching solution to extract, wherein aluminum enters in raffinate phase to form an aluminum chloride solution as well as iron enters in raffinate phase; (3) performing a liquid atomizing pyrolysis to aluminum chloride to obtain aluminum oxide; (4) using water as a re-extraction preparation in raffinate phase for carrying out a re-extraction, wherein iron enters in the re-extraction preparation to form an iron chloride solution; performing a liquid atomizing pyrolysis to iron chloride to obtain iron red. According to the invention, the valuable elements of aluminum, iron, silicon and the like in fly ash are synthetically utilized, the process flow is short and the operation is simple, so that the ecological synthetic utilization method realizes the synthetic utilization of all the valuable elements of aluminum, iron, silicon and the like in fly ash.

Description

technical field [0001] The invention relates to a processing method of fly ash, in particular to an ecological comprehensive utilization method of fly ash. Background technique [0002] Fly ash is a highly dispersed solid-phase aggregate, and its particle shape is mainly hollow microspheres in the amorphous phase, amorphous carbon particles, irregular glass bodies and other mineral debris. Except for a part of unburned fine carbon particles in the mineral assemblage, most of them are SiO 2 and Al 2 o 3 Generally, the mass content of alumina is 15-45%, the mass content of silicon oxide is 30-60%, and the mass content of iron oxide is 5%-40%. At present, my country's fly ash stockpile has exceeded 3 billion tons. The comprehensive utilization of fly ash can not only provide raw materials for the production of alumina and turn waste into treasure, but also effectively reduce environmental pollution and save the land occupied by stockpiling fly ash. Therefore, its market pro...

Claims

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Application Information

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IPC IPC(8): C01F7/02C01G49/06C01B7/01C01B31/36B09B3/00
Inventor 张廷安豆志河吕国志刘燕鲍丽牛丽萍赵秋月蒋孝丽牟望重赫冀成
Owner DONGDA NONFERROUS SOLID WASTE TECH RES INST LIAOLING CO LTD
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