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Method of producing poly aluminium iron silicate composite flocculating agent using fly ash and ferrous sulphate

A polyaluminum ferric silicate and composite flocculant technology, which is applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of process equipment investment cost, high production and operation cost, harsh preparation conditions, complex process, etc. Production cost and sewage treatment cost, good product stability, and the effect of simplifying the process

Active Publication Date: 2007-07-11
重庆市化工研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process has the following disadvantages: it uses more raw and auxiliary materials, including fly ash, ironmaking slag, sodium hydroxide, sodium carbonate, sulfuric acid and hydrochloric acid; and has special requirements for raw materials, Fe 2 o 3 20-40% iron-making waste slag with a content of 40-50%, Fe 2 o 3 The content is 4%-10%, Al 2 o 3 The content is 20-30%, SiO 2 Fly ash with a content of 40-60%; the process is complex and the preparation conditions are harsh, and it needs to be carried out under a certain pressure condition (0.5-0.6MPa)
Therefore, if it is used for industrialization, its process equipment investment cost, production operation cost, etc. are high, and the cost of waste water treatment is too high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Weigh 2.5Kg of fly ash, 2.5Kg of ferrous sulfate and 1.5Kg of soda ash and mix them thoroughly, then roast them at 850°C for 50 minutes, and cool to room temperature to obtain the primary product.

[0021] The primary product was impregnated with 70Kg of industrial hydrochloric acid with a volume ratio of 1:1 at 80°C for 3 hours, left to stand at room temperature for 2 hours, and centrifuged to obtain a liquid product, polyaluminosilicate iron, which did not appear after 3 months of storage. gel.

Embodiment 2

[0023] Weigh 2.5Kg of fly ash, 2.5Kg of ferrous sulfate and 2Kg of soda ash and mix them thoroughly, then roast them at 850°C for 40 minutes, and cool to room temperature to obtain the primary product.

[0024] The primary product was impregnated with 80Kg of industrial hydrochloric acid with a volume ratio of 1:1 at 70°C for 3 hours, left to stand at room temperature for 2 hours, and centrifuged to obtain a liquid product, polyaluminum iron silicate, which did not appear after 3 months of storage. gel.

Embodiment 3

[0026] Weigh 2.5Kg of fly ash, 2.5Kg of ferrous sulfate and 2Kg of soda ash and mix them thoroughly, then roast them at 850°C for 30 minutes, and cool to room temperature to obtain the primary product.

[0027] The primary product was impregnated with 80Kg of industrial hydrochloric acid with a volume ratio of 1:1 at 60°C for 3 hours, left to stand at room temperature for 1 hour, and centrifuged to obtain a liquid product, polyaluminosilicate iron, which did not appear after 3 months of storage. gel.

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Abstract

A process for preparing the aluminum iron polysilicate as composite flocculant from powdered coal ash and ferrous sulfate as the by-product of titanium white powder includes such steps as preparing the primary-class product, impregnating, and separating product.

Description

1. Technical field [0001] The invention belongs to a polymer flocculant for water treatment, in particular to a preparation method of polyaluminum iron silicate. 2. Background technology [0002] At present, the polyaluminium-silicon flocculants developed at home and abroad can be roughly divided into two categories: one is the product made by introducing silicon into polyaluminum sulfate, such as polyaluminum-silicon sulfate flocculant (PASS); the other is Based on activated silicic acid, the product is made by adding aluminum salt, such as polyaluminum silicate (PSAS). The preparation process of the former is relatively complicated and has high requirements for raw materials and equipment; the preparation process of the latter is simple and cheap, but its effective concentration is low, its stability is poor, and it is difficult to commercialize. It is only suitable for on-site preparation and investment in water plants. add. Polyaluminum-iron silicate flocculant is a co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/52
Inventor 曹平赵丽颖吴渝黄力武李波
Owner 重庆市化工研究院有限公司