Method for preparing flocculant aluminum polychlorid by utilizing coal ash

A technology of polyaluminum chloride and fly ash, which is applied in the fields of aluminum chloride, aluminum halide, flocculation/sedimentation water/sewage treatment, etc. It can solve problems such as long mechanical grinding time, low extraction rate of aluminum and iron, and complicated process. Achieve the effect of low cost, improved reactivity, and simple operation
CN107628632AActive Publication Date: 2018-01-26唐山中絮工业水处理有限公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
唐山中絮工业水处理有限公司
Publication Date
2018-01-26
Patent Text Reader

Abstract

The invention belongs to the technical field of flocculant production and specifically relates to a method for preparing flocculant aluminum polychlorid by utilizing coal ash. The method for preparingflocculant aluminum polychlorid by utilizing coal ash comprises the following steps: grinding and sieving the coal ash and using aqueous alkali for ultrasonically treating; mixing the coal ash treated with alkali, compound sodium additive and water and then activating with microwave, thereby acquiring pre-activated coal ash; calcinating and activating the pre-activated coal ash under high temperature, thereby acquiring the secondary pre-activated coal ash; performing acid leaching and high-temperature high-pressure acid solution on the secondary pre-activated coal ash, and then using calciumaluminate mineral powder for regulating the basicity, thereby acquiring the aluminum polychlorid. The method provided by the invention is simple in operation and low in cost, is suitable for industrial production, utilizes the coal ash as the raw material and is capable of turning waste into wealth, reducing the production cost and avoiding the environmental pollution caused by the waste coal ashsolid.
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Description

technical field

[0001] The invention belongs to the technical field of flocculant production, and in particular relates to a method for preparing flocculant polyaluminium chloride by using fly ash. Background technique

[0002] Fly ash is a solid waste produced after coal combustion, and its main chemical components mainly include Al 2 o 3 , Fe 2 o 3 , SiO 2 , CaO, K 2 O et al. Among them, Al 2 o 3 The content is about 15-40%, SiO 2 The content is about 34-66%. It is a typical aluminosilicate mineral. In addition, there are traces of Ge, Ga, U, Ni, Pt and other rare elements in fly ash. Fly ash is mostly off-white to black, from which we can see the level of carbon content. The particle size of fly ash particles is between 0.5 μm and 300 μm. It is a porous material with a large specific surface area and good adsorption activity.

[0003] About 98% of my country's coal utilization is achieved through combustion, and a large amount of fly ash is produced during the ...

Claims

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