Polymeric ferric sulfate water treatment agent and preparation method thereof

A technology for polymerizing sulfuric acid and treating chemicals, which is applied in the direction of flocculation/sedimentation water/sewage treatment, etc. It can solve the problem of high cost of using chemicals, and achieve the effects of protecting personnel and equipment safety, production safety, and quick response

Inactive Publication Date: 2013-03-06
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The market prices of oxidants such as sodium chlorate and hydrogen peroxide are 5,000 yuan / ton and 1,500 yuan / m 3 , the cost of using the medicine is also higher

Method used

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  • Polymeric ferric sulfate water treatment agent and preparation method thereof
  • Polymeric ferric sulfate water treatment agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The preparation steps of polyferric sulfate water treatment agent:

[0042] (1) Configure 1m 3 For the acidic aqueous solution of ferrous salt, the mass ratio of ferrous sulfate and sulfuric acid is controlled to be 1:0.45, and the mass fraction of ferrous sulfate to be configured is 20% ferrous salt aqueous solution (using 457.2kg of ferrous sulfate heptahydrate, 93% sulfuric acid 78.0kg).

[0043] (2) Pump the configured ferrous salt solution into the reaction tank.

[0044] (3) Introduce ozone-containing gas to make ozone and ferrous react in the reaction tank. Ozone gas comes from an ozone machine with a ventilation volume of 600Nm 3 / h, the ozone concentration is 90g / m 3 .

[0045] (4) After 0.5h and 1h of reaction, take samples and analyze them respectively. When the characteristics of the samples meet the production index, stop the ventilation, draw out the product, and end a round of reaction.

[0046] After 0.5h of reaction, 71% of ferrous ions were conve...

Embodiment 2

[0048] The differences between this implementation and Example 1 are:

[0049] Ferrous sulfate solution with a mass fraction of 15% is used as the ozone absorbing liquid, and the ventilation volume is 600Nm 3 / h, the ozone concentration is 80g / m 3 . After 1 h of reaction, all ferrous ions were converted into ferric ions. After the solution absorbs ozone gas, the concentration of ozone in the tail gas is 0.2mg / m 3 .

Embodiment 3

[0051] The differences between this implementation and Example 1 are:

[0052] Use ferrous sulfate solution with a mass fraction of 10% as the ozone absorbing liquid, and the air flow is 500Nm 3 / h, the ozone concentration is 60g / m 3 . After 1 h of reaction, all ferrous ions were converted into ferric ions. After the solution absorbs ozone gas, the concentration of ozone in the tail gas is 0.2mg / m 3 .

[0053] The polyferric sulfate prepared in Example 1 was compared with the commercially available product in terms of water treatment performance.

[0054] Each 10g sample was dissolved in 100ml water to make polyferric solution. Add the solution into landfill leachate with V=250mL, pH=5, COD 710mg / L, chroma 3000 times, and the concentration of polyiron in the leachate is 900mg / L. Stir at 200r / min for 3min, 60r / min for 10min, then let stand for 30min, take the supernatant to measure COD and chromaticity. The polyferric sulfate that this embodiment makes and commercially ava...

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Abstract

The present invention discloses a polymeric ferric sulfate water treatment agent and a preparation method thereof. The method comprises the following steps: (1) preparing an acidic aqueous solution of ferrous sulfate: controlling a mass ratio of ferrous sulfate heptahydrate to sulfuric acid to 1:(0.44-0.45), and preparing an aqueous solution, wherein the mass of the ferrous sulfate is 10-20% of the total mass of the solution; and (2) introducing ozone-containing gas to the aqueous solution, carrying out a reaction for at least 0.5 h, and carrying out hydrolysis and polymerization of ferric ions to obtain the polymeric ferric sulfate water treatment agent. According to the present invention, ozone is adopted as an oxidizing agent, an additional catalyst is not required to be poured, heating on the solution is not required during the whole reaction, the reaction can be performed under atmospheric pressure, the reaction is fast, production efficiency is high, high value-added products are obtained while the ozone is utilized and removed by the production process, impurities harmful for human body or equipment or byproducts can not be produced, and an environment protection characteristic is provided.

Description

technical field [0001] The invention relates to a method for producing polyferric sulfate, in particular to the reaction of low-cost ferrous salt solution with ozone to produce polyferric salt water treatment agent with higher added value. Background technique [0002] Polymerized ferric sulfate is a high-quality and efficient inorganic iron salt polymer flocculant, which has the functions of decolorization, deodorization, turbidity removal, oil removal, dehydration, COD removal, etc., and has excellent coagulation performance, dense alum flower, and settlement performance Good and other advantages, widely used in industrial wastewater and drinking water supply water treatment. [0003] At present, the production methods of polyferric sulfate are mainly divided into two categories, catalytic oxidation method and direct oxidation method. [0004] a. The catalytic oxidation method is to use oxygen to oxidize ferrous ions into iron ions under the action of catalysts such as so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52
Inventor 汪晓军詹德明林旭龙崔家琪
Owner SOUTH CHINA UNIV OF TECH
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