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Method for preparing poly aluminum ferric silicate composite flocculating agent by using red mud and ferrous sulfate

A polyaluminum-iron silicate and composite flocculant technology, which is applied in the direction of flocculation/sedimentation water/sewage treatment, etc., to achieve the effect of short floc settling time, simple process and good flocculation effect

Inactive Publication Date: 2012-07-11
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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So far, there has been no report on the preparation of polyaluminum iron silicate flocculant by using red mud and ferrous sulfate

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  • Method for preparing poly aluminum ferric silicate composite flocculating agent by using red mud and ferrous sulfate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] First crush the red mud to a particle size of 100 mesh, then weigh 1Kg of red mud, 1Kg of ferrous sulfate and 0.5Kg of soda ash and mix thoroughly, roast the above mixture at 900°C for 1 hour, cool naturally to room temperature, and then The roasted product is acid-leached with 25Kg of industrial hydrochloric acid with a volume ratio of 1:1 at 90°C for 2 hours with stirring, and finally the acid-leached product is centrifuged, and the filtrate is aged at room temperature for 1 hour to obtain polyaluminum iron silicate Composite flocculant, the product is stored for 3 months without gel.

Embodiment 2

[0035] First crush the red mud to a particle size of 200 mesh, then weigh 1.5Kg of red mud, 1.95Kg of ferrous sulfate and 1.2Kg of soda ash and mix them thoroughly, roast the above mixture at 800°C for 2 hours, and cool it down to room temperature naturally. Then the roasted product is acid-leached with 70Kg of industrial hydrochloric acid with a volume ratio of 1:1 at 60°C for 4 hours with stirring, and finally the acid-leached product is centrifuged, and the filtrate is aged at room temperature for 2 hours to obtain polysilicic acid. Aluminum-iron composite flocculant, the product has not gelled for 3 months.

Embodiment 3

[0037] First, crush the red mud to a particle size of 80 meshes, then weigh 2Kg of red mud, 2.4Kg of ferrous sulfate and 1.4Kg of soda ash and mix them thoroughly, roast the above mixture at 700°C for 2.5 hours, cool naturally to room temperature, and then The roasted product was acid-leached with 100Kg of industrial hydrochloric acid with a volume ratio of 1:1 at 80°C for 5 hours with stirring, and finally the acid-leached product was centrifuged, and the filtrate was aged at room temperature for 1 hour to obtain polyaluminum silicate Iron composite flocculant, the product has not gelled for 3 months.

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Abstract

The invention relates to a method for preparing a poly aluminum ferric silicate composite flocculating agent by using red mud and ferrous sulfate. The method comprises the following steps: fully mixing the red mud and the ferrous sulfate as well as alkali according to the weight ratio of 1:06-1.3:0.4-0.9, roasting and cooling a mixture at a temperature of 700-1000 DEG C; acid-pickling a cooled product and hydrochloric acid with a volume ratio of 1:1 according to the weight ratio of 1:4-25 at a temperature of 40-95 DEG C; and centrifugally separating an acid-pickled product and aging a filtrate to obtain the poly aluminum ferric silicate composite flocculating agent. The method has the benefits that the process flow is simple, the investment is less, and the operating expense is low; a synthesized product integrates the advantages of an aluminum flocculating agent and a ferric flocculating agent, and the stability and the water purification effect are good; and meanwhile, the invention provides a new approach for the utilization of the red mud as well as by-product ferrous sulfate for producing titanium dioxide, so that the resource utilization rate is improved, and the economic benefit, the environmental benefit and the social benefit are excellent.

Description

technical field [0001] The invention relates to a method for preparing a polymer flocculant for water treatment, in particular to a method for preparing polyaluminum-iron silicate composite flocculant by using red mud and ferrous sulfate. Background technique [0002] Coagulation is currently one of the most widely used unit technologies in the field of water treatment. The purification treatment of surface water as urban drinking water or industrial water source, the treatment of various industrial wastewater and urban sewage, the reinjection of oilfield groundwater and sludge disposal, and the advanced treatment of urban and industrial reuse water often use coagulation As a pre-key unit technology in the water treatment process, it is a pre-treatment process for the separation and removal of polluting impurities. However, the effect of coagulation treatment not only determines the operation status of the subsequent treatment process to a large extent, but also affects the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52
Inventor 赵颖席北斗夏训峰张列宇李晓光杨天学
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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