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Method for preparing modified polyaluminium chloride flocculating agent by waste molecular sieve

A technology of polyaluminum chloride and waste molecular sieve, which is used in the removal of aluminum chloride, aluminum halide, solid waste, etc. body formation, the effect of overcoming poor stability

Inactive Publication Date: 2009-12-02
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a method for preparing a modified polyaluminum chloride flocculant with simple process and low cost. The modified polyaluminum chloride flocculant obtained by the method has a good treatment effect and can effectively solve the problem of existing flocculants. Difficult and poorly treated sewage and pollutants

Method used

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  • Method for preparing modified polyaluminium chloride flocculating agent by waste molecular sieve
  • Method for preparing modified polyaluminium chloride flocculating agent by waste molecular sieve

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Embodiment 1

[0022] Activation steps of waste molecular sieves:

[0023] In the petroleum industry, after a period of use, the catalytic performance has declined, but the main components of the molecular sieve have basically remained unchanged, and washed with a large amount of water. drying. Place it in a muffle furnace and heat it at a temperature of about 550°C for about 6 hours. After cooling, place the molecular sieve in a desiccator and it can be used.

[0024] Preparation steps:

[0025] 1. Break the activated molecular sieve, and then sieve it with a 60-mesh sieve to obtain a molecular sieve powder with a size above 60 mesh. Sieve commercially available industrial-grade calcium aluminate with a 60-mesh sieve to obtain calcium aluminate powder with a size above 60 mesh.

[0026] 2. Weigh 20 grams of molecular sieve powder and 20 grams of calcium aluminate powder.

[0027] 3. Prepare 100 ml of hydrochloric acid solution with a volume fraction of 20%.

[0028] 4. First add hydro...

Embodiment 2

[0030] The modified polyaluminum chloride flocculant of Example 1 was used to treat low-temperature and low-turbidity sewage. The experimental water was taken from the sewage of the sewage plant and the effluent after biochemical treatment. Modified PAC (polyaluminum chloride) of the present invention and other four kinds of coagulants have been compared, confirmed the superiority of the processing effect of the invention (please see figure 2 ).

[0031] The water quality of the sewage plant's domestic sewage after biochemical treatment is as follows: COD is 60-140mg / L, TP is 2-6mg / L, and turbidity is 10-80NTU. Enhanced coagulation was used for advanced treatment (the average water temperature was 6°C, and the pH of the water sample was about 7.5). The COD, TP and turbidity of the water samples were measured respectively, and different coagulants were used for advanced treatment of the biochemical effluent. The results are compared as follows :

[0032] The modified polyalu...

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Abstract

The invention provides a method for preparing a modified polyaluminum chloride flocculating agent by a waste molecular sieve, and relates to a method for preparing a modified polyaluminum chloride flocculating agent. The method comprises the following steps: activating, crashing and sieving the waste molecular sieve to obtain molecular sieve powder of which the grain size is less than 60 meshes; measuring and taking the molecular sieve powder, calcium aluminate powder and hydrochloric acid according to the mass ratio of 1:1-2:5-6;, mixing the calcium aluminate powder and the hydrochloric acid, stirring the mixture for 2 to 3 minutes; and then adding the molecular sieve powder in the mixture and reacting the mixture at a temperature of between 96 and 98 DEG C for 1.5 to 2 hours; standing the mixture for 30 minutes, adjusting the pH value of the supernatant fluid to 2 to 4 by a weak alkali such as solution of sodium carbonate, or solution of sodium bicarbonate, or ammonia water and the like; curing the supernatant fluid at a temperature of between 50 and 60 DEG C for 12 hours to obtain a liquid product of the modified polyaluminum chloride flocculating agent; and drying the liquid of the modified polyaluminum chloride flocculating agent to obtain a solid product of the modified polyaluminum chloride flocculating agent. According to tests, in the solid product, the content of aluminum oxide is more than 30 percent, the basicity is over 80 percent, the content of insoluble substance is less than 0.5 percent, and other indexes all meet the national standards of the modified polyaluminum chloride flocculating agent. The method has the advantages of simple process, low cost and high economic and social benefits.

Description

technical field [0001] The invention discloses a method for preparing a modified polyaluminum chloride flocculant by using waste molecular sieves, and relates to a preparation method of a modified polyaluminum chloride flocculant. Background technique [0002] Polyaluminum chloride (PAC) is a fast-growing fine chemical product at home and abroad, and it is an efficient flocculant in water treatment. In the early days, aluminum chips, aluminum ash and aluminum slag were used to prepare polyaluminium chloride. The process was relatively simple and the development was relatively rapid. With the emergence of aluminum-containing products with higher value, the production of polyaluminum chloride with this raw material has been decreasing day by day. The production cost of using aluminum hydroxide and aluminum chloride as raw materials is too high, so at present, aluminum-containing minerals are generally used as raw materials to prepare polyaluminum chloride in China. In recent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/56C02F1/52B09B3/00
Inventor 潘碌亭束玉保
Owner TONGJI UNIV
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