Fly ash comprehensive treatment and utilization method and device

A comprehensive treatment and fly ash technology, applied in the direction of silica, aluminum chloride, aluminum halide, etc., to achieve cost saving, low cost, and large-scale industrial production

Active Publication Date: 2017-01-11
HUANGGANG NORMAL UNIV +1
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  • Abstract
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  • Application Information

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Problems solved by technology

After consulting relevant materials and Chinese patent documents, no relevant reports were found on the use of other raw materials to produce fumed silica

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  • Fly ash comprehensive treatment and utilization method and device
  • Fly ash comprehensive treatment and utilization method and device
  • Fly ash comprehensive treatment and utilization method and device

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Embodiment Construction

[0028] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but the protection scope of the present invention is not limited to the following embodiments.

[0029] The structure of the preparation device provided in this example is as follows: figure 1 As shown, the device includes a hot air feeding system, a chemical reaction system, a cooling system and an exhaust gas absorption system, wherein the hot air feeding system is used to store compressed air and send it into the chemical reaction system after heating the air. The hot air feeding system comprises an air compressor 12, an air storage tank 13, an air heater 14 and pipelines, the air compressor 12, the air storage tank 13 and the air heater 14 are connected by pipelines, and the pipelines are also provided with valves and meter.

[0030] The chemical reaction system is composed of an acid liquid storage tank 1, a feed bin 2 and a reactor 3, th...

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Abstract

The invention provides a fly ash comprehensive treatment and utilization method which comprises the following steps: grinding fly ash, and carrying out magnetic separation by a magnetic separator to remove iron; treating the ground material with a hot acid solution, washing, and dewatering for later use; adding a fluorine-containing acid solution into a reaction kettle while stirring, adding hydrochloric acid and/or nitric acid into the reaction kettle, and reacting to generate silicon tetrafluoride gas, wherein the silicon tetrafluoride gas and volatile acidic gas in the mixed acid solution are taken into a cooling kettle along with vapor by negative pressure; carrying out reaction on the gas mixture in the cooling kettle to generate SiO2.nH2O, collecting the SiO2.nH2O in the cooling kettle, removing the residual acidic gas, and drying to obtain the gas-phase silicon dioxide product. The invention also provides a device used in the method. The fly ash and other wastes used as the raw materials are made into the high-added-value product gas-phase silicon dioxide, thereby achieving the effect of changing wastes into valuable substances.

Description

technical field [0001] The invention relates to a comprehensive treatment and utilization method and device for coal-fired power plant waste—fly ash, which belongs to the technical field of chemical purification and environmental protection. Background technique [0002] According to Yang Jing, Jiang Zhouqing, Ma Hongwen, Su Shuangqing, Wang Mingwei, Li Jinhong, Yao Wengui, etc. in the article "China Aluminum Resources and Research Progress in Extracting Alumina from High-aluminum Fly Ash": Fly ash is a clay mineral and associated mineral in coal combustion. The product calcined at high temperature, the chemical composition of fly ash is mainly silicon, aluminum, iron, calcium silicates and oxides. According to statistics, in 2004, China's fly ash discharge exceeded 200 million tons. In 2010, the fly ash discharge was 480 million tons. It is estimated that the fly ash discharge will reach 580 million tons in 2015. More than 2.5 billion tons of fly ash, resulting in land occ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/18C01F7/56
Inventor 田辉明杨水彬田正芳叶发兵江军民
Owner HUANGGANG NORMAL UNIV
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