Preparation method and application of modified polyferric sulfate for treating industrial wastewater

A technology of polymerizing ferric sulfate and hydrated ferrous sulfate, which is applied in the fields of ferric sulfate, water/sewage treatment, chemical instruments and methods, etc., and can solve problems such as difficult disposal of excess sludge, slow settling speed of flocs, and large chemical sludge , to achieve the effect of good chroma removal effect, low cost and guaranteed source

Active Publication Date: 2015-04-01
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the process of advanced treatment of waste paper and papermaking wastewater by using polyferric sulfate, there are disadvantages such as slow settling speed of flocs, large chemical sludge and difficult treatment of excess sludge, so it is necessary to modify polyferric sulfate To improve the performance of its flocculation and sedimentation

Method used

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  • Preparation method and application of modified polyferric sulfate for treating industrial wastewater
  • Preparation method and application of modified polyferric sulfate for treating industrial wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0063] 1. Prepare ferrous sulfate solution

[0064] Add 10.9 mL of concentrated sulfuric acid into 480 mL of distilled water, and stir while adding to obtain a sulfuric acid solution with a mass fraction of 4%; weigh 263.2 heptahydrate ferrous sulfate crystals and add them to the above sulfuric acid solution, stir and dissolve at 200 r / min for 12 min, Make ferrous sulfate heptahydrate and the weight ratio of sulfuric acid solution be 1:2, promptly add 1g ferrous sulfate heptahydrate in every 2g sulfuric acid solution, make ferrous sulfate solution;

[0065] Sulfuric acid has two functions in the synthesis process of polyferric sulfate: one is to participate in the polymerization reaction as a raw material for the reaction, and the other is to determine the acidity of the reaction system, and its dosage directly affects the performance of polyferric sulfate. An appropriate increase in the amount of sulfuric acid is beneficial to improve the synthesis reaction, but the amount of...

Embodiment 2

[0075] 1. Prepare ferrous sulfate solution

[0076] Add 13.5mL of concentrated sulfuric acid into 525.25mL of distilled water, and stir while adding to obtain a sulfuric acid solution with a mass fraction of 4.5%; weigh 263.2 heptahydrate ferrous sulfate crystals and add them to the above sulfuric acid solution, stir and dissolve at 220r / min for 13min , so that the weight ratio of ferrous sulfate heptahydrate and sulfuric acid solution is 1:2.2, promptly add 1g ferrous sulfate heptahydrate in every 2.2g sulfuric acid solution, make ferrous sulfate solution;

[0077] 2. Preparation of polyferric sulfate solution

[0078] Take by weighing sodium chlorate 11.9g, make the weight of sodium chlorate and the ratio of ferrous sulfate heptahydrate weight in step 1) be 1:21, under the stirring speed of 220r / min, 5.95g sodium chloride is added to sulfuric acid In the ferrous solution, stir for 13min, then add 1.49g sodium chlorate, then add 1.49g sodium chlorate every 4min, after all th...

Embodiment 3

[0083] 1. Prepare ferrous sulfate solution

[0084] Add 8.6mL of concentrated sulfuric acid into 434.25mL of distilled water, and stir while adding to obtain a sulfuric acid solution with a mass fraction of 3.5%; weigh 263.2 heptahydrate ferrous sulfate crystals and add them to the above sulfuric acid solution, stir and dissolve at 150r / min for 12min , so that the weight ratio of ferrous sulfate heptahydrate and sulfuric acid solution is 1:1.8, promptly add 1g ferrous sulfate heptahydrate in every 1.8g sulfuric acid solution, make ferrous sulfate solution;

[0085] 2. Preparation of polyferric sulfate solution

[0086] Take by weighing sodium chlorate 11.36g, make the weight of sodium chlorate and the ratio of ferrous sulfate heptahydrate weight in step 1) be 1:22, under the stirring speed of 150r / min, 5.68g sodium chloride is added to sulfuric acid In the ferrous solution, stir for 12min, then add 1.42g sodium chlorate, then add 1.42g sodium chlorate every 4min, after sodium...

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Abstract

The invention provides a preparation method of modified polyferric sulfate. Kaolin and talcum are utilized to perform modification treatment on the polyferric sulfate. When the modified polyferric sulfate is used in a waste paper papermaking advanced wastewater treatment technique, the pollutant removal ratio is high, and the chroma removal effect is good: the removal ratio of the modified polyferric sulfate for COD (chemical oxygen demand) in wastewater is up to 71.9-75%, the SS (suspended sediment) removal ratio is up to 64-75%, and the chroma removal ratio is up to 88.3-96.9%. Under the same conditions, compared with the polyferric sulfate, the COD removal ratio is enhanced by 8.3-11.2%, the SS removal ratio is enhanced by 9-12.5%, and the chroma removal ratio is enhanced by 6.9-8.3%. The modified polyferric sulfate has high flocculation speed and has the same decolorization effect; and the consumption of the modified polyferric sulfate is greatly lower than that of the polyferric sulfate, so the generated chemical sludge quantity is low, thereby saving the cost and simplifying the technique.

Description

technical field [0001] The invention relates to the field of waste paper and papermaking wastewater treatment, relates to the research and preparation of a coagulant, and in particular to a preparation method of modified polyferric sulfate. Background technique [0002] Waste paper papermaking is to crush the recycled waste paper, deink it, remove sundries, etc., and then make pulp for papermaking again. Since waste paper recycled paper can effectively utilize resources and protect the ecological environment, people pay more and more attention to it. With the continuous maturity of waste paper pulping technology, waste paper has become an important raw material for pulp production. In 1995, foreign waste paper accounted for 30% to 34% of pulping raw materials. In recent years, my country's waste paper recycling papermaking factories are also increasing. In the process of waste paper making, in order to separate the fibers in the waste paper and remove the ink from the fibe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C01G49/14
CPCC01G49/14C02F1/5236C02F1/56C02F2103/28
Inventor 李海松买文宁刘旭亚杜家绪周军闫二矿代吉华王敏
Owner ZHENGZHOU UNIV
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