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Preparation method of polyaluminum sulfate

A technology for polymerizing aluminum sulfate and aluminum sulfate, applied in aluminum sulfate, chemical instruments and methods, aluminum-sulfur compounds, etc., can solve the problems of low degree of polymerization, little difference in properties, use effects, and poor use effects, and achieve product properties. No delamination, good phosphorus removal and stable product properties

Inactive Publication Date: 2017-12-26
WUHAN QIANRUITAI ENVIRONMENT TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The degree of polymerization of the product obtained by this preparation method is low, usually less than 20%, because the degree of polymerization is relatively low, compared with unpolymerized aluminum sulfate, the difference in properties and use effects is not large; secondly, the effective Al in the obtained polyaluminum sulfate 2 o 3 The content is low, mostly less than 10%, generally only 5-7%, effective Al 2 o 3 Low content, poor use effect
2. Two-step synthesis is adopted. First, low molecular weight aluminum sulfate is prepared by reacting aluminum-containing raw materials (such as bauxite, kaolin, aluminum ash, etc.) with sulfuric acid, and then adding alkalizing agents (such as slaked lime, ammonia, carbonate, Hydrogen salt, etc.) to carry out polymerization, the process is complicated, and the operation is troublesome

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] First, add water with 4-4.5 times the weight of aluminum sulfate to the chemical reaction kettle, stir and heat up to 50°C, add aluminum sulfate and calcium aluminate while stirring, calcium aluminate is gradually added to the aluminum sulfate solution, at the reaction temperature Continue to stir and react at 50°C for 1.0-1.2 hours to obtain liquid polyaluminum sulfate; secondly, filter the polyaluminum sulfate to remove impurities to obtain liquid polyaluminum sulfate, and send the liquid polyaluminum sulfate to the concentration tank to concentrate to the original volume Stop concentrating after 1 / 3 of the concentration, and send it into a spray dryer for post-spray drying to obtain powdered polyaluminum sulfate. The drying temperature in the spray dryer is 40-45°C, and the drying time is 1.2-1.4 hours, of which sulfuric acid Aluminum 35kg and calcium aluminate 5kg.

Embodiment 2

[0016] First, add water with 4-4.5 times the weight of aluminum sulfate to the chemical reaction kettle, stir and heat up to 50°C, add aluminum sulfate and calcium aluminate while stirring, calcium aluminate is gradually added to the aluminum sulfate solution, at the reaction temperature Continue to stir and react at 110°C for 1.0-1.2 hours to obtain liquid polyaluminum sulfate; secondly, filter the polyaluminum sulfate to remove impurities to obtain liquid polyaluminum sulfate, and send the liquid polyaluminum sulfate to the concentration tank to concentrate to the original volume Stop concentrating after 1 / 3 of the concentration, and send it into a spray dryer for post-spray drying to obtain powdered polyaluminum sulfate. The drying temperature in the spray dryer is 40-45°C, and the drying time is 1.2-1.4 hours, of which sulfuric acid Aluminum 35kg and calcium aluminate 95kg.

Embodiment 3

[0018] First, add water with 4-4.5 times the weight of aluminum sulfate to the chemical reaction kettle, stir and heat up to 50°C, add aluminum sulfate and calcium aluminate while stirring, calcium aluminate is gradually added to the aluminum sulfate solution, at the reaction temperature Continue to stir and react at 75°C for 1.0-1.2 hours to obtain liquid polyaluminum sulfate; secondly, filter the polyaluminum sulfate to remove impurities to obtain liquid polyaluminum sulfate, and send the liquid polyaluminum sulfate to the concentration tank to concentrate to the original volume Stop concentrating after 1 / 3 of the concentration, and send it into a spray dryer for post-spray drying to obtain powdered polyaluminum sulfate. The drying temperature in the spray dryer is 40-45°C, and the drying time is 1.2-1.4 hours, of which sulfuric acid Aluminum 35kg and calcium aluminate 50kg.

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Abstract

The invention aims at providing a preparation method of polyaluminum sulfate. The preparation method is simple, prepared polyaluminum sulfate is high in precision and has a remarkable flocculation effect. The flocculation reaction speed of prepared polyaluminum sulfate is 20% higher than that of a similar product, and prepared polyaluminum sulfate has good effects on removing COD, chroma and phosphorous in sewage and is particularly applicable to purification treatment of high-concentration pulping and papermaking sewage.

Description

technical field [0001] The invention relates to a preparation method of polyaluminum sulfate, which belongs to the technical field of sewage treatment. Background technique [0002] Polyaluminum sulfate is a composite high molecular polymer with a huge molecular structure and strong adsorption capacity, and its water purification effect is better than all traditional inorganic water purifiers. After inputting raw water, the flocs formed are large, the sedimentation speed is fast, the activity is high, and the filterability is good. And it has strong adaptability to various raw water, and has little effect on the pH value of water (PH value 4-11). Regardless of the turbidity of raw water or the concentration of wastewater pollutants, its purification effect is remarkable. Less dosage: less corrosive to equipment and pipelines, easy to operate, less dosage, and lower purification cost. [0003] Usually, the preparation methods of polyaluminum sulfate are as follows: 1. Usin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/74C02F1/52C02F103/28
CPCC01F7/74C02F1/5245C02F2103/28
Inventor 周文婷罗超何运良
Owner WUHAN QIANRUITAI ENVIRONMENT TECH CO LTD