A kind of polyphosphorus ferric sulfate flocculant and its preparation method and application

A polyphosphorus ferric sulfate and flocculant technology, applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, phosphorus compounds, etc., can solve problems such as unsuitable water treatment applications, increased production costs, environmental pollution, etc. The flocculation effect will not be weakened, the reaction speed is fast, and the use is convenient.

Active Publication Date: 2017-03-29
武汉市中润精细化学品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Though this invention turns waste into treasure, waste ferrous sulfate is utilized; But the polyphosphorus ferric sulfate product that adopts this method can contain a small amount of substances such as chlorate, and various ions that remain can affect the quality of product, Therefore it is not suitable for water treatment application; Not only that, in order to improve the oxidation efficiency, the slightly excessive sodium chlorate added in the reaction can produce chlorine gas by side reaction, and the chlorine gas that escapes from the reaction system can cause environmental pollution, so need Add tail gas absorption device to treat chlorine gas, which will increase the production cost

Method used

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  • A kind of polyphosphorus ferric sulfate flocculant and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: a kind of preparation method of polyphosphorus ferric sulfate flocculant:

[0022] 1) Weigh 55.6 g of ferrous sulfate heptahydrate and place it in a beaker, add 30 mL of industrial sulfuric acid with a mass concentration of 20%, stir at room temperature for 10 min at a stirring speed of 60 r / min, and carry out acidification and dissolution;

[0023] 2) After step 1) is dissolved, add 14 mL of hydrogen peroxide with a mass concentration of 30% at a rate of 1 mL / min under continuous stirring to fully oxidize, insert the thin tube into the bottom of the beaker, and continue stirring for 10 minutes after the addition is complete. min, forming a uniform reddish-brown liquid;

[0024] 3) Weigh 9.36 g of sodium dihydrogen phosphate, add it to the liquid prepared in step 2) at a slow speed, stir to dissolve and polymerize for 20 minutes, and continue to stir;

[0025] 4) After the solution 3) is stirred evenly, add NaHCO under stirring condition 3 Solid 5.04 g, ...

Embodiment 2

[0030] Embodiment 2: a kind of preparation method of polyphosphorus ferric sulfate flocculant:

[0031] 1) Weigh 55.6 g of ferrous sulfate heptahydrate and place it in a beaker, add 27 mL of industrial sulfuric acid with a mass concentration of 25%, stir at room temperature for 15 min at a stirring speed of 65 r / min, and carry out acidification and dissolution;

[0032] 2) After the dissolution in step 1) is completed, add 12 mL of hydrogen peroxide with a mass concentration of 35% at a rate of 1.5 mL / min under continuous stirring to fully oxidize, insert the thin tube into the bottom of the beaker, and continue stirring for 15 min after the addition is complete , forming a uniform reddish-brown liquid;

[0033] 3) Weigh 9.36 g of sodium dihydrogen phosphate, add it into the liquid prepared in step 2) at a slow speed, stir to dissolve and polymerize for 25 minutes, and continue to stir;

[0034] 4) After the solution 3) is stirred evenly, add NaHCO under stirring condition 3 S...

Embodiment 3

[0038] Embodiment 3: a kind of preparation method of polyphosphorus ferric sulfate flocculant:

[0039] 1) Weigh 55.6 g of ferrous sulfate heptahydrate and place it in a beaker, add 22 mL of industrial sulfuric acid with a mass concentration of 30%, stir at room temperature for 20 min at a stirring speed of 70 r / min, and carry out acidification and dissolution;

[0040] 2) After step 1) is dissolved, add 20 mL of hydrogen peroxide with a mass concentration of 30% at a rate of 1 mL / min to fully oxidize while continuing to stir, insert a thin tube into the bottom of the beaker, and continue stirring for 10 min after the addition is complete , forming a uniform reddish-brown liquid;

[0041] 3) Weigh 9.36 g of sodium dihydrogen phosphate, add it to the liquid prepared in step 2) at a slow speed, stir to dissolve and polymerize for 20 minutes, and continue to stir;

[0042] 4) After the solution 3) is stirred evenly, add NaHCO under stirring condition 3 Solid 5.04 g, adding spee...

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Abstract

The invention discloses a polymeric phosphorus ferric sulfate flocculating agent as well as a preparation method and an application thereof. The preparation method of the flocculating agent comprises the following steps: by taking an industrial byproduct namely ferrous sulfate septihydrate of titanium dioxide and waste sulfuric acid as main raw materials, adding hydrogen peroxide as an oxidant, and adding sodium dihydrogen phosphate and sodium hydrogen carbonate at the same time, and performing the steps of oxidation, hydrolysis, polymerization and ageing at normal temperature and normal pressure. The prepared product contains an active ingredient of all iron Fe<3+> with the mass content of more than or equal to 11%, the basicity is 18-25%, and the pH value is 1.4-1.6, so that the product can be widely used for feed water treatment and sewage-wastewater treatment, has a very good effect of removing turbidity, chemical oxygen demand and total phosphorus, and particularly can effectively remove soluble phosphorus and phosphorus in other forms from water and has a certain effect of removing algae and chlorophyl a from alga wastewater. The polymeric phosphorus ferric sulfate flocculating agent disclosed by the invention is simple in polymeric phosphorus ferric sulfate component and good in stability, is a liquid product, can be directly applied and is convenient to use; moreover, the preparation raw materials are low in cost, and waste utilization is realized; and the preparation process avoids generation of three wastes, and belongs to green production processes.

Description

technical field [0001] The invention belongs to the field of resource utilization and environmental protection, and in particular relates to a polyphosphorus ferric sulfate flocculant and its preparation method and application. Background technique [0002] Flocculants are widely used as a low-cost water pollution control material. At present, flocculants can be roughly divided into three categories: inorganic, organic and microbial. Among them, inorganic polymer flocculants have better performance than traditional inorganic low molecular flocculants such as aluminum sulfate and ferric chloride, and are lower in cost than organic polymer flocculants. They have gradually become mainstream flocculants and have been successfully used in various water treatment project. Nevertheless, the relative molecular weight, polymerization degree and flocculation bridging ability of single inorganic polymer flocculants are still worse than those of organic polymer flocculants, and there ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/52C01B25/37
Inventor 郑怀礼蔡娜周于皓唐晓旻陈伟赵纯邓祥睿
Owner 武汉市中润精细化学品有限公司
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