Rare earth compounded coagulating agent for treating waste water and its preparation method

A technology of rare earth compounding and wastewater treatment, which is applied in the direction of flocculation/sedimentation water/sewage treatment, separation methods, chemical instruments and methods, etc., can solve the problems of high consumption, high price, unsatisfactory removal of wastewater chroma, etc. Small amount, good coagulation effect, excellent coagulation effect

Inactive Publication Date: 2003-02-05
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this kind of coagulant has better coagulation effect, it is more expensive, the dosage is high, and it is not ideal for the color removal of wastewater.

Method used

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  • Rare earth compounded coagulating agent for treating waste water and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: 1. get 25 grams of mixed rare earth oxides, the purity is 99%, and its average molar number is 0.075 mol, slowly add 13.47 ml concentration under stirring and be 98% sulfuric acid (its quality is 26.14 grams, and the molar number is 0.2667 mol) , Ln 2 o 3 : SO 4 2- The molar ratio is 1:3.556, and it is fully reacted under stirring, and the rare earth sulfate compound produced is dissolved in the sulfuric acid when the pH value is 1.5, and 35 ml of its clear solution is taken for later use. ② Take 1000ml of liquid polyaluminum chloride solution, its Al 2 o 3 The content is 12%, the basicity is 60%, the consumption of the liquid polyaluminum chloride solution is controlled at a Ln / Al molar ratio of 0.05834: 1, and the liquid polyaluminum chloride solution is continuously stirred vigorously at a temperature of 65°C, slowly Add 35ml of the prepared sulfuric acid solution of rare earth sulfuric acid compound, keep it warm for 1.5h, the basicity is 55%, lea...

Embodiment 2

[0029] Embodiment 2: 1. get 14 grams of mixed rare earth oxides, purity 99%, its average molar number is 0.042mol, slowly add 7.35ml concentration under stirring and be the sulfuric acid of 98% (its quality is 14.55 grams, and molar number is 0.1455mol) , Ln 2 o 3 : SO4 2- The molar ratio is 1:3.464, stirring continuously to make it fully react, the rare earth sulfate compound produced is dissolved in the sulfuric acid when the pH value is 2, and 18ml of its clear solution is taken for later use. ② Take 982ml of liquid polyaluminium chloride solution, its Al 2 o 3 The content is 11%, the basicity is 69%, the dosage of the liquid polyaluminum chloride solution is controlled at a Ln / Al molar ratio of 0.03333:1, and the temperature is 75°C, with continuous vigorous stirring, and slowly adding the prepared rare earth sulfate The sulfuric acid solution of the compound was 18ml, kept warm for 2h, the basicity was 65%, left to mature for 24h, and then dried to obtain a solid prod...

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Abstract

The present invention relates to a rare earth compounded coagulating agent for treating waste water, and the effective components of its solid product are Al2O3 27%-29%, Ln2O3 0.5%-6.0% and SO4(2-) 0.5%-6.5%, and its basic degree is 55%-68%. It is made up by using aluminium polychloride as main component and adding the elements of rare earth and sulfur, etc. through a certain compounding process, in which the introduction quantity of the rare earth compound can be controlled in that the mole ratio o f Ln / Al is 0.0055:1 to 0.06624:1. Said ivnention also provides the preparation method of said coagualting agent.

Description

technical field [0001] The invention relates to a coagulant for waste water treatment. The invention also relates to a preparation method of the coagulant. Background technique [0002] At present, there are many coagulants used in wastewater treatment, and there are many literature reports on coagulants. For example, CN1257046A discloses a high alkalinity calcium polyaluminum chloride silicon composite coagulant and its preparation method. It is to add calcium carbonate solid powder or its suspension to the liquid polymerization in batches under normal pressure and stirring. Aluminum chloride, and then compound with polysilicic acid to obtain a stable product; or first compound polyaluminum chloride and polysilicic acid, and then use calcium carbonate to increase the degree of alkalinity for preparation. The obtained product has the effects of removing turbidity and decolorization. Another example is that CN1131642A discloses a high-polymerization...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D21/01C02F1/52
Inventor 魏玉娟朱俊萍
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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