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

A technology of polysilicate ferric sulfate and polyferric aluminum sulfate, which is applied in the fields of ferric sulfate, chemical instruments and methods, water/sewage treatment, etc., can solve the problems of low economical practicability of treatment technology, no further treatment of leached slag, high Solve problems such as heavy metal residues, and achieve the effects of high added value, favorable specific surface area, and low production cost

Active Publication Date: 2017-08-08
宁夏师范学院
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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

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

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Experimental program
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Effect test

Embodiment 1

[0016] Weigh a certain amount of coal gangue, mix it with 85% industrial sulfuric acid and coal gangue at a mass ratio of 1.2, react in a closed manner at 120°C for 60 minutes, dissolve and filter in a water bath at 80°C to obtain iron-aluminum sulfate solution, and use hydrogen peroxide Iron oxide aluminum sulfate is polymerized at room temperature for 30 minutes to obtain polyferric aluminum sulfate; coal gangue leaching slag is leached with 4mol / L NaOH alkali to obtain active sodium silicate solution, according to the volume ratio of polyferric aluminum sulfate and active sodium silicate 2:1, the mass concentration of active sodium silicate is 10% and the compound copolymerization is carried out, and the polysilicate ferric aluminum sulfate product is obtained after the copolymerization for 1 hour.

[0017] The dosage of PAFSS flocculant is 5mL / L. After flocculation treatment, the turbidity removal rate of wastewater reaches 98.9%, which drops to 0.40NTU; the chroma removal ...

Embodiment 2

[0019] Weigh a certain amount of coal gangue, mix it with 85% industrial sulfuric acid and coal gangue at a mass ratio of 1.2, react in a closed manner at 120°C for 60 minutes, dissolve and filter in a water bath at 80°C to obtain iron-aluminum sulfate solution, and use hydrogen peroxide Iron oxide aluminum sulfate is polymerized at room temperature for 60 minutes to obtain polyferric aluminum sulfate; coal gangue leaching slag is leached with 4mol / L NaOH alkali to obtain active sodium silicate solution, according to the volume ratio of polyferric aluminum sulfate and active sodium silicate 3:1, the mass concentration of active sodium silicate is 20% to carry out composite copolymerization, after copolymerization for 2 hours, polysilicate ferric aluminum sulfate product is obtained.

[0020] The dosage of PAFSS flocculant is 6mL / L. After flocculation treatment, the turbidity removal rate of wastewater reaches 99.3%, which drops to 0.35NTU; the chroma removal rate reaches 93.7%;...

Embodiment 3

[0022] Weigh a certain amount of coal gangue, mix it with 85% industrial sulfuric acid and coal gangue at a mass ratio of 1.2, react in a closed manner at 120°C for 60 minutes, dissolve and filter in a water bath at 80°C to obtain iron-aluminum sulfate solution, and use hydrogen peroxide Iron oxide aluminum sulfate is polymerized at room temperature for 90 minutes to obtain polyferric aluminum sulfate; coal gangue leaching slag is leached with 4mol / L NaOH alkali to obtain active sodium silicate solution, according to the volume ratio of polyferric aluminum sulfate and active sodium silicate 4:1, the mass concentration of active sodium silicate is 30% and the compound copolymerization is carried out. After the copolymerization for 3 hours, the polysilicate ferric aluminum sulfate product is obtained.

[0023] The dosage of PAFSS flocculant is 7mL / L. After flocculation treatment, the turbidity removal rate of wastewater reaches 99%, which drops to 0.39NTU; the chroma removal rate...

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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...

Claims

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Application Information

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IPC IPC(8): C02F1/52C01G49/14
CPCC01G49/14C02F1/5236
Inventor 刘成龙马新贤王海滨张志峰叶飞
Owner 宁夏师范学院
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