Method for producing sludge modifier by utilizing coal gangue

Abstract

The invention discloses a method for producing sludge modifier by utilizing coal gangue, comprising the following steps: fully and evenly mixing the coal gangue and carbonate, and calcining; soaking the calcined solid matter by water, and filtering to obtain filter residue and alkaline filter liquor; dissolving the filter residue by adopting the acid liquor, and filtering to obtain the alkaline filter liquor; mixing the acidic filter liquor and the alkaline filter liquor; respectively adjusting the alkalinity and the acidity of the mixing system and the concentration of SiO3<3->, Al<3+> and Fe<3+>; carrying out polymerization reaction; carrying out spray drying after the polymerization reaction to obtain the sludge modifier taking polysilicate aluminum iron as a main component. Compared with the prior art, the technical scheme of the invention activates the coal gangue by utilizing a high temperature condition, simultaneously realizes the extraction and separation of Si element, simplifies the production process, and adopts the low-price carbonate as an auxiliary raw material, thus saving the production cost, and multi-element extraction is carried out on the raw materials of the coal gangue, thus improving the use ratio of the raw materials of the coal gangue.

Description

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AI Technical Summary

Benefits of technology

This technology uses heated temperatures for activation of coal grits during different stages of treatment processes like pyrolisis or dissolving it out. It achieves this through various techniques including chemically treatments that remove specific components (Si) while minimizing environmental impact on landfill sites. Additionally, use of expensive carbonating agents instead of stronger bases helps increase efficiency when separating other metals like iron. Overall, these technologies improve resource recovery and reduce cost over current practices.

Problems solved by technology

This patents discusses how different ways exist to recover valuable metallurgical or technical properties associated with coal gangues (a type of residual product) after burning without causing environmental concerns like air quality issues due to emissions. Current techniques involve collectively exploiting this natural source through various means including crushing, pyrolyzing, baking, grinding, milling, sifting, flotting, and others. However, current processes result in incomplete use of useful ingredients while generating excessive amounts of greenhouse gas emission. There remains an urgent problem where efficient utilization and reduction of fossil fuels consumption contribute towards global warming and climate change impacts negatively affecting future energy supply distribution systems and ecologically friendly environments around us.

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