Prepn process of polymerized iron phosphosulfate

A technology for the preparation of polymerized phosphorus ferric sulfate, which is applied in the direction of flocculation/sedimentation water/sewage treatment, etc. It can solve the problems of low cost, secondary pollution, high energy consumption of solid polyferric, etc., and achieve large flocs and fast settling speed Effect

Inactive Publication Date: 2004-04-07
EAST CHINA UNIV OF TECH
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Problems solved by technology

Most manufacturers in my country use catalytic oxidation method to prepare liquid polyferron. Although this method is simple in process and low in cost, the reaction time is long and the amount of catalyst is large, and the reaction process is prone to secondary pollution; solid polyferron has high energy consumption and low cost. , unstable quality

Method used

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Embodiment Construction

[0007] The production method and preparation process of the invention embodiment are as follows: firstly cool the boiling water for 10 minutes to 70°C, then stir and add ferrous sulfate to make it saturated at 80°C, then cool to 50°C, and use a preheated Buchner funnel to filter. Select hydrogen peroxide as an oxidant to convert ferrous iron into ferric iron, take the filtrate as a reaction feed liquid and place it in a reactor, add sodium chlorate and sodium pyrophosphate, wherein, nFe 2+ : nNaClO 3 =1mol:0.15mol, nFe 2+ : nNa 4 P 3 o 7 =1 mol:0.015 mol. React for 25 minutes to make a liquid product, and dry the liquid product at 50-60°C to get a reddish-brown solid product.

[0008] The relevant index comparison of embodiment product of the present invention and polyferric sulfate sample at home and abroad

[0009] Items High-quality standard samples of polyferric sulfate at home and abroad Polymerized ferric sulfate samples

[0010] Appearance reddish brown liquid r...

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Abstract

The preparation process of polymerized iron phosphosulfate includes adding ferrous sulfate into water at 70-80 deg.c until reaching saturation, filtering, adding oxidant or catalyst to convert two-valent iron into three-valent iron, and adding sodium chlorate and sodium pyrophosphate to react for 20-30 min to obtain the product. The present invention introduces phosphate radical ion to ferrous sulfate skeleton to obtain extremely high alkalisation degree of ferrous sulfacte, and the polymerized iron phosphosulfate as flocculant is easy to hydrolyze, can form large flocculate with high settling rate and may be used to well eliminate BOD, COD, heavy metal, nitrite nitrogen, etc. from sewage.

Description

Technical field: [0001] The present invention relates to the preparation process of water quality purifying agent, especially the preparation process of polyphosphorus ferric sulfate Background technique: [0002] The chemical industry has made great contributions to the further development of science and technology, but the "three wastes" produced in the production process have also caused great harm to the environment. The chemical industry is not only a big energy consumer, but also a big polluter. The production of titanium dioxide in my country mainly adopts the sulfuric acid method. In its very extensive production process, the output of ferrous sulfate heptahydrate far exceeds the output of titanium dioxide itself. Due to the narrow use range of ferrous sulfate heptahydrate, the market prospect is bleak, and the transportation Expenses are higher again, so that manufacturers simply pile up ferrous sulfate heptahydrate for a long time and let it run off, which not only ...

Claims

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Application Information

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IPC IPC(8): C02F1/52
Inventor 刘峙嵘牛建国梁喜珍
Owner EAST CHINA UNIV OF TECH
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