Production method of polyaluminium chloride

A polyaluminum chloride, production method technology, applied in aluminum chloride, aluminum halide, flocculation/sedimentation water/sewage treatment and other directions, can solve problems such as pollution, achieve the effects of solving environmental problems, reducing dependence, and saving costs

Inactive Publication Date: 2010-12-29
SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention provides a kind of production method of polyaluminium chloride, replaces bauxite partly with fly ash, uses the acid waste water that produces active clay process to produce polyaluminum chloride at the same time, along with the price of bauxite rises gradually , this method can save costs, and at the same time, recycle fly ash to provide raw materials for the preparation of water purifying agent polyaluminium chloride, which not only solves the problem of environmental pollution, but also achieves the purpose of resource recovery and comprehensive utilization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Add 1.8t of bauxite and 0.2t of fly ash into the reaction kettle, add 2t of hydrochloric acid and 2t of industrial wastewater with an acid content of 1.6%, add 0.1t of sodium fluoride, heat to 120°C, and heat and stir under airtight conditions React for 1.5 hours, filter after the reaction to obtain 3.6t of filtrate once, add 0.72t of calcium aluminate powder to the filtrate, in order to make the polymerization reaction more thorough, add calcium aluminate powder in stages, first add a theoretical amount of 50 at 80°C % calcium aluminate powder, in the case of relatively high acidity, the calcium aluminate powder can be fully reacted. After heating and stirring for 1.5 hours, add 25% of the theoretical amount. At this moment, add water to adjust while adding calcium aluminate powder. Make the volume of this secondary liquid 1.5 times the original, heat and stir for an hour, then add the final theoretical amount of 25% into the secondary liquid, and also add water to adju...

Embodiment 2

[0020] Add 1.6t of bauxite and 0.4t of fly ash into the reaction kettle, add 2t of hydrochloric acid and 4t of industrial wastewater with an acid content of 1.6%, add 0.1t of sodium chloride, heat to 100°C, and heat and stir under airtight conditions React for 3 hours; after the reaction, filter to obtain a filtrate 3.6t, add 0.72t calcium aluminate powder to the filtrate, in order to make the polymerization reaction more thorough, add the calcium aluminate powder in stages, first add a theoretical amount of 50 % calcium aluminate powder, in the case of relatively high acidity, the calcium aluminate powder can be fully reacted. After heating and stirring for an hour, add 25% of the theoretical amount. At this moment, add water to adjust while adding calcium aluminate powder. Make the volume of this secondary liquid 1.5 times of the original, heat and stir for about half an hour, then add the final theoretical amount of 25% into the secondary liquid, and also add water to adjust...

Embodiment 3

[0022] Add 1.4t of bauxite and 0.6t of fly ash into the reaction kettle, add 2t of hydrochloric acid and 6t of industrial wastewater with an acid content of 1.6%, add 0.1t of ammonium fluoride, heat to 80°C, and heat and stir under airtight conditions React for 4 hours, filter after the reaction to get a filtrate 3.6t, add 0.72t calcium aluminate powder to the filtrate, in order to make the polymerization reaction more thorough, add the calcium aluminate powder in stages, first add a theoretical amount of 50 at 120°C % calcium aluminate powder, in the case of higher acidity, the calcium aluminate powder can be fully reacted, after heating and stirring for 40 minutes, then add 25% of the theoretical amount, at the same time adding calcium aluminate powder while adding water to adjust, Make the volume of this secondary liquid 1.5 times of the original, heat and stir for 10 minutes, then add the final theoretical amount of 25% into the secondary liquid, and also add water to adjus...

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Abstract

The invention relates to a production method of polyaluminium chloride. The mixture of coal ash and bauxite is added into a kettle; industrial hydrochloric acid and acidic waste water are added, and then cosolvent is added; the mixture is heated and stirred under the sealing condition; after heated to 80-120 DEG C, the mixture reacts for 1.5-4 hours; after reaction ends, the obtained mixture is filtered; the filtrate is heated, and polymerizer is added; temperature is controlled to 80-120 DEG C; polymerization reaction is carried out for 1-3 hours to obtain the liquid polyaluminium chloride product; and after dried, the solid polyaluminium chloride is obtained. The invention uses coal ash to partially replace bauxite; acidic waste water is added so that cost is saved, the obtained product has good flocculation effect, and heavy metal content reaches the standard. The waste slag produced in the production process of the invention has small specific resistance, is easy to filter and can save energy. The invention aims to recycle the coal ash, provides raw material for preparing water treatment agent, solves the problem of environment pollution caused by waste water discharge and obtains the purpose of recycling comprehensive utilization of resource.

Description

technical field [0001] The invention relates to a production method of polyaluminum chloride. The polyaluminum chloride water purifier produced by the method has excellent water purification performance and wide application range. Background technique [0002] Fly ash is the residue of industrial coal combustion, the main component is SiO 2 、Al 2 o 3 , Fe 2 o 3 , CaO, MgO, K 2 O, Na 2 O and other trace elements. Of which SiO 2 、Al 2 o 3 The content is as high as 80%, which is an important source of silicon and aluminum raw materials. Since the fly ash is in a high-temperature fluidized state after coal combustion, after quenching, its structure forms a glassy solid substance with short-range order and long-range disorder, mainly composed of SiO 2 -Al 2 o 3 Bond. This structure determines that aluminum and silicon are difficult to dissolve out under normal conditions. People have tried to solve this problem in different ways. Common methods include high-temper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/56C02F1/52
Inventor 杜冬云李娜应伟
Owner SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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