Method for preparing high performance polysilicate ferric aluminum sulfate from coal gangue

Abstract

A method for preparing high performance polysilicate ferric aluminum sulfate from coal gangue aims to provide a method for preparing the high performance polysilicate ferric aluminum sulfate from the coal gangue as a main raw material, and provides a new approach for efficient intergraded recycling utilization of the coal gangue, and a new the technology for an iron and aluminum inorganic polymer flocculant is explored. Industrial sulfuric acid and the coal gangue by leached in an acid to obtain ferric aluminum sulfate, the ferric aluminum sulfate is oxidized and polymerized to obtain poly ferric aluminum sulfate, active sodium silicate is obtained from leaching residue by alkali leaching, the poly ferric aluminum sulfate and the active sodium silicate are added for compounding and copolymerization in accordance with the volume ratio and different mass concentrations to obtain a polysilicate ferric aluminum sulfate product after copolymerization for 1-3H. The comprehensive utilization of the coal gangue is complete, the prepared product has high added value, the method has the advantages of convenient operation, low energy consumption, simple process, and the like, can solve the problem of high turbidity, high chroma and high heavy metal residues and the like of all kinds of wastewater, and the wastewater can meet national emission standards.

Description

technical field [0001] The invention relates to a method for preparing high-performance polysilicate iron-aluminum sulfate by using coal gangue, and is particularly suitable for the comprehensive utilization of coal gangue and the treatment of various waste waters with high turbidity, high chroma and high heavy metal residues. Background technique [0002] The main component of coal gangue is SiO 2 、Al 2 o 3 , Fe 2 o 3 The total content of coal gangue accounts for more than 80% of coal gangue. If this part of resources can be fully utilized, it will have positive significance for improving the environment, improving economic and social benefits, and achieving sustainable development. [0003] Inorganic flocculants have the advantages of wide adaptability, good water treatment effect, non-toxic or low toxicity, wide source of raw materials, simple preparation process, and simple water treatment operation, etc., and have become a hot research topic today. Polyaluminum iro...

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Problems solved by technology

[0005] Comparative analysis of the above studies found that: Xinghong et al. used steelmaking sludge and sodium silicate crystals as raw materials in the preparation of polysilicon ferric aluminum sulfate, and the treatment technology was not economically practical, and the leaching residue after acid leaching of steelmaking sludge Without further treatment, there are problems such as secondary pollution; Guo Zhaohui et al. used water glass, sodium chlorate, ferrous sulfate heptahydrate and aluminum sulfate 18 hydrate as compound materials to prepare polysilicate aluminum ferric sulfate. This process only produces products, the economy is poor, and the turbidity removal rate is not high

[0006] In view of the above situation, in order to improve the economy and treatment effect of the flocculant, a new type of high-efficiency flocculant was prepared to solve the problems of high turbidity, high chroma, and high heavy metal residue in wastewater, so that the preparation process is simple and there is no secondary Pollution, under the condition of low dosage, the problems of high turbidity, high chroma and high heavy metal residue in various types of wastewater can be solved, so that the wastewater can meet the requirements of the national discharge standard

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