Polysilicate iron/cationic starch composite flocculant and preparation method thereof

A technology of cationic starch and composite flocculant, which is applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, water/sewage treatment, etc. Wide range, simple to operate, easy to use effects

Pending Publication Date: 2020-02-21
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that the treatment of titanium dioxide waste acid has become a difficult problem faced by titanium dioxide enterprises in my country. Due to the high processing cost, the operating cost of titanium dioxide production enterprises has been increased. Therefore, it is necessary to explore a low-cost treatment method for titanium dioxide waste acid. Using titanium dioxide waste acid and starch as raw materials to develop a new type of organic-inorganic composite flocculant to treat aquaculture wastewater, it not only achieves the purpose of treating titanium dioxide waste acid, but also achieves the purpose of treating aquaculture wastewater, and brings good benefits to social development. economic and environmental benefits

Method used

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  • Polysilicate iron/cationic starch composite flocculant and preparation method thereof
  • Polysilicate iron/cationic starch composite flocculant and preparation method thereof
  • Polysilicate iron/cationic starch composite flocculant and preparation method thereof

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Embodiment 1

[0034] A preparation method of polyferric silicate / cationic starch composite flocculant, comprising the following steps:

[0035] (1) Neutralization of waste acid: to 1L total iron concentration is 1.5mol / L, and density is 1.8g / mL of titanium dioxide waste acid, add milk of lime, keep stirring, neutralize to pH and be 1.0, obtain mixture;

[0036] (2) suction filtration: the mixture is subjected to suction filtration, and the obtained filtrate is the neutralization waste acid, for subsequent use;

[0037] (3) ripening polymerization: add the sodium silicate solution of 0.1L 3.75mol / L in the neutralized waste acid (the mol ratio of the silicon in the sodium silicate solution and the iron in the titanium dioxide waste acid is 1:4), stir Evenly, then add 5mL 30% hydrogen peroxide to oxidize the ferrous iron in the solution to ferric iron, then add sodium hydroxide to adjust the pH of the solution to be 3.0, then add 8.4g cationic starch (iron and cationic starch in the titanium d...

Embodiment 2

[0039] A preparation method of polyferric silicate / cationic starch composite flocculant, comprising the following steps:

[0040] (1) Neutralization of waste acid: to 1L total iron concentration is 1.7mol / L, and density is 1.8g / mL of titanium dioxide waste acid, adding lime milk, stirring constantly, and neutralization to pH is 1.2, to obtain mixture;

[0041] (2) suction filtration: the mixture is subjected to suction filtration, and the obtained filtrate is the neutralization waste acid, for subsequent use;

[0042] (3) ripening polymerization: add the sodium silicate solution of 0.1L 3.75mol / L in the neutralized waste acid (the mol ratio of the silicon in the sodium silicate solution and the iron in the titanium dioxide waste acid is 1:4), stir Evenly, then add 6mL 30% hydrogen peroxide to oxidize the ferrous iron in the solution to ferric iron, then add sodium hydroxide to adjust the pH of the solution to be 2.8, then add 11.2g of cationic starch (iron and cationic starch ...

Embodiment 3

[0044] A preparation method of polyferric silicate / cationic starch composite flocculant, comprising the following steps:

[0045] (1) Neutralization of waste acid: to 1L total iron concentration is 2.0mol / L, and density is 1.9g / mL of titanium dioxide waste acid, add milk of lime, keep stirring, neutralize to pH 1.5, obtain mixture;

[0046] (2) suction filtration: the mixture is subjected to suction filtration, and the obtained filtrate is the neutralization waste acid, for subsequent use;

[0047] (3) ripening polymerization: add the sodium silicate solution of 0.1L 5mol / L in the neutralized waste acid (the mol ratio of silicon in the sodium silicate solution and the iron in the titanium dioxide waste acid is 1:3), stir evenly , then add 6mL 30% hydrogen peroxide to oxidize the ferrous iron in the solution to ferric iron, then add sodium hydroxide to adjust the pH of the solution to be 2.6, then add 5.6g of cationic starch (the difference between iron and cationic starch in t...

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Abstract

The invention discloses a polysilicate iron/cationic starch composite flocculant and a preparation method thereof. According to the invention, titanium dioxide waste acid, cationic starch, a sodium silicate solution, lime milk, hydrogen peroxide and an alkali are used as raw materials, a polysilicate iron flocculant is prepared by using the titanium dioxide waste acid, and the polysilicate iron and the cationic starch are compounded through a copolymerization method to successfully prepare the polysilicate iron/cationic starch composite flocculant, wherein the prepared polysilicate iron/cationic starch composite flocculant has good adsorption and flocculation effects on the turbidity, the chromaticity removal rate, the COD, the total nitrogen and the total phosphorus of breeding wastewater; and the method is simple in process and low in cost, turns titanium dioxide waste acid into wealth, treats pollution of breeding wastewater, achieves the treatment of waste with waste, and providesa new way for resource utilization of titanium dioxide waste acid.

Description

technical field [0001] The invention belongs to the technical field of composite materials, in particular to a polyferric silicate / cationic starch composite flocculant and a preparation method thereof. Background technique [0002] In recent years, the development of aquaculture has been in full swing. The "2018 National Fishery Statistics Summary" pointed out that in 2018, the total economic output value of fisheries in the whole society was 2,586.447 billion yuan, and the fishery output value was 1,281.541 billion yuan, of which the ratio of the output value of aquaculture products to fishing products was 77.8:22.2. During aquaculture, a large amount of waste accumulates at the bottom of the pond. These wastes mainly come from the residual bait thrown during aquaculture, fish and shrimp excrement, etc. In modern aquaculture, fish generally can only absorb about 25% of the protein value of the added feed, and most of the rest enter the water body. In the oxygen-rich envi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F103/20
CPCC02F1/5245C02F1/5263C02F2103/20C02F2209/08C02F2209/11C02F2209/16
Inventor 黄祖强丁勇朝张燕娟胡华宇梁景陈丛瑾覃宇奔
Owner GUANGXI UNIV
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