Preparation of efficient polybasic acid iron salt flocculant

A multi-acid, high-efficiency technology, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of long cycle, large investment and large area

Inactive Publication Date: 2009-07-08
SHANGHAI AI QI ECOLOGICAL TECH
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Problems solved by technology

[0002] According to incomplete statistics, there are 35 billion tons of domestic and industrial wastewater in my country's urban and rural areas, but the treatment capacity is only less than 60%, and most of them cannot meet the new national discharge standards.
At present, due to the insurmountable disadvantages of the sewage treatment biochemical method, such as large area, large investment, and long cycle, as well as its limited treatment effect, environmental an

Method used

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Embodiment Construction

[0004] A. First use iron slag with an iron content of 7--20%, fertilizer plant iron catalyst waste residue, scrap iron chips, etc. to carry out steam heating reaction with more than 10% waste sulfuric acid, and the reaction temperature is 80°C to remove impurities and obtain sulfuric acid A solution of about 20--30% iron oxidizes ferrous ions into ferric ions;

[0005] B, add 6--15% sodium phosphate (keep 60 ℃ of temperature) with 30% ferrous sulfate solution, feed chlorine simultaneously and carry out oxidation reaction, react 30 minutes;

[0006] C, then use 8--20% industrial waste alkali to adjust the degree of alkalinity polymerization, add 2% calcium chloride as a stabilizer, react for 30 minutes, absorb and remove impurities by activated carbon, and obtain the chlorinated (phosphorus) ferric sulfate in the polymer state liquid products;

[0007] D, the impurity removal and purification of the above-mentioned crude liquid promptly obtain the liquid high-efficiency polyba...

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Abstract

The invention relates to a method for preparing a novel high-efficiency polybasic acid molysite flocculant. Industrial waste or a low-value byproduct is used as a main material. The flocculant can be widely used for multiple kinds of wastewater; the use amount of the flocculant is reduced by 1 to 3 times than that of other polymeric molysite; and the removing rate of TDS in the wastewater by the flocculant can reach between 45 and 80 percent and is higher than that of other polymeric molysite flocculant by 20 to 40 percent. The preparation method comprises that: firstly, iron slag with iron content of between 7 and 20 percent and other ferric scrap are heated by steam of waste sulphuric acid and react for 30 minutes to prepare a liquid ferrous sulfate coarse product; at a temperature of 60 DEG C, the coarse product is added with proper amount of sodium phosphate, is introduced with chlorine and is oxidized for 30 minutes; industrial waste alkali is used for regulating the basification degree for polymerization; and 2 percent calcium chloride as a stabilizing agent is added to the coarse product and is added with active carbon for adsorption and impurity removal to prepare a liquid product of a ferric sulfate chloride (phosphide)(abbreviated as tribasic acid molysite) flocculant in a polymeric state.

Description

1. Technical field: [0001] The invention is a preparation method of a novel high-efficiency polybasic acid iron salt flocculant 2. Background technology: [0002] According to incomplete statistics, there are 35 billion tons of domestic and industrial wastewater in my country's urban and rural areas, but the treatment capacity is only less than 60%, and most of them cannot meet the new national discharge standards. The international community has expressed great concern to China's COD total control, and China's pollution control has greatly affected the global environmental quality. Due to many reasons, especially the technical lack of cost-effective and environmentally friendly drugs is one of the important factors. At present, due to the insurmountable disadvantages of the sewage treatment biochemical method, such as large area, large investment, and long cycle, as well as its limited treatment effect, environmental and chemical research departments and professionals at h...

Claims

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Application Information

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IPC IPC(8): C02F1/52
Inventor 陈弓
Owner SHANGHAI AI QI ECOLOGICAL TECH
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