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Controllable slow-release polyphosphate scale inhibitor and preparation method thereof

A slow-release polyphosphate and antiscalant technology, applied in chemical instruments and methods, descaling and water softening, water/sludge/sewage treatment, etc., can solve the problems of difficult release control and high TDS, and achieve Long life, good effect of sustained release

Active Publication Date: 2019-04-19
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of high TDS and difficulty in controlling the release amount of current phosphorus-containing scale inhibitors, the primary purpose of the present invention is to provide a method for preparing a controllable slow-release polyphosphate scale inhibitor

Method used

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  • Controllable slow-release polyphosphate scale inhibitor and preparation method thereof
  • Controllable slow-release polyphosphate scale inhibitor and preparation method thereof
  • Controllable slow-release polyphosphate scale inhibitor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] According to the mass ratio of calcium oxide 23%, concentrated phosphoric acid 40% (phosphoric acid content 85wt.%), silicon dioxide 18%, aluminum oxide 19% after mixing evenly, first react at 100°C for 1 hour, and then melt at 1600°C at high temperature , to polymerize the raw materials, and after fully reacting for 2 hours, pour into a spherical mold for molding, and then anneal and cool to obtain slow-release polyphosphate. Grind the obtained slow-release polyphosphate into powder with a grinder, add 20wt.% PVA binder (slow-release polyphosphate is 100%), carry out extrusion granulation by a screw extrusion granulator, and form a diameter of 0.5mm Controlled slow-release polyphosphate antiscalant products.

Embodiment 2

[0027] According to the mass ratio of calcium oxide 25%, concentrated phosphoric acid 36% (phosphoric acid content 85wt.%), silicon dioxide 11%, aluminum oxide 28% after mixing evenly, first react at 80°C for 2 hours, and then melt at 1300°C at high temperature , to polymerize the raw materials, and after fully reacting for 4 hours, pour it into a spherical mold for molding, and then anneal and cool to obtain slow-release polyphosphate. Gained slow-release polyphosphate is ground into powder with a grinder, and 20wt.% PVA binder (slow-release polyphosphate is 100%) is added, and extruded and granulated by a screw extrusion granulator to form a 3mm diameter pellet. Controlled slow release polyphosphate antiscalant product.

Embodiment 3

[0029] According to the mass ratio of calcium oxide 27%, concentrated phosphoric acid 32% (phosphoric acid content 85wt.%), silicon dioxide 14%, aluminum oxide 27% after mixing evenly, first react at 100°C for 2 hours, and then melt at 1500°C at high temperature , to polymerize the raw materials, and after fully reacting for 4 hours, pour it into a spherical mold for molding, and then anneal and cool to obtain slow-release polyphosphate. Gained slow-release polyphosphate is ground into powder with a grinder, and 20wt.% PVA binder (slow-release polyphosphate is 100%) is added, and extruded and granulated by a screw extrusion granulator to form a diameter of 2mm. Controlled slow release polyphosphate antiscalant product.

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Abstract

The invention belongs to the field of scale inhibitor materials and discloses a controllable slow-release polyphosphate scale inhibitor and a preparation method thereof. The preparation method includes the steps of uniformly mixing calcium oxide, concentrated phosphoric acid, silicon dioxide and aluminum oxide, enabling the raw materials to react with one another at 80-100 DEG C for 1-2 hours, raising the temperature to 1,300-1,600 DEG C for a high-temperature fusion polymerization reaction for 2-4 hours, pouring obtained reactants into a mold for molding, and conducting annealing and coolingto obtain slow-release polyphosphate; grinding the obtained slow-release polyphosphate into powder and then adding an adhesive for extrusion granulation to obtain the controllable slow-release polyphosphate scale inhibitor. The controllable slow-release polyphosphate scale inhibitor has the advantages of good scale inhibition effect, long effective period, low cost and the like. Moreover, the related preparation method is easy to operate, and the scale inhibitor is suitable for scale inhibition in the fields of drinking water treatment, industrial water treatment and the like and has an important practical application value.

Description

technical field [0001] The invention belongs to the field of scale inhibitor materials, and in particular relates to a controllable slow-release polyphosphate scale inhibitor and a preparation method thereof. Background technique [0002] The descaling methods for drinking water are mainly physical and chemical methods, such as ion exchange technology, membrane separation technology, molecular sieve adsorption technology, etc. Among them, ion exchange technology is a mature traditional process, but the resin is easily polluted and oxidized to cause failure, frequent regeneration, and sodium ions will be replaced, making the water treated by this technology unsuitable for long-term drinking. Common membrane separation technologies include nanofiltration membrane and reverse osmosis membrane technology. The characteristics of these two technologies are that the effect is obvious and stable, but they have high requirements on the inlet water pressure, and the water utilization ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/14
CPCC02F5/14
Inventor 肖凯军张雨涵银玉容谌凯程瑶周少奇
Owner SOUTH CHINA UNIV OF TECH
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