KR20040040264A - Drinking water inhibitor a method of manufacture system - Google Patents

Abstract

PURPOSE: Provided are a method for preparing a rust inhibitor of drinking water, which is able to provide a silicate rust inhibitor or a complex salt rust inhibitor showing increased continuous dust-inhibiting effect, and a manufacturing device thereof, which is able to reduce environmental pollution by using a gas fuel not containing impurities, mass-produce large amount of molten substance and is easy to be repaired and maintained. CONSTITUTION: The method comprises the steps of (a) mixing 54 wt.% of silica powder or silica (SiO2: at least 99.9 % purity), 33 wt.% of anhydrous Na2CO3, 4 wt.% of anhydrous P2O5, 5 wt.% of K4P2O7, 8.5 wt.% of Na5P9O10, 1 wt.% of K2CO3 and 0.5 wt.% of CaCO3; (b) melting the mixture in a melting furnace at a temperature of 1500 deg.C for 4 to 5 hrs; and (c) tapping the molten mixture from the melting furnace to obtain glassy crystal. The device is characterized in that a melting furnace is a movable ground tunnel type open hearth furnace of gas burner and a graphite melting pot(4) is installed on the bottom of a melting chamber and a melting temperature is controlled at 1,500 deg.C and molten substance is tapped from a tapping port(6).

Description

Drinking water inhibitor a method of manufacture system

The present invention relates to a manufacturing method and a manufacturing apparatus for rust inhibitors for drinking water.

The present invention is a supplementary application of 'No. 94-1992' Preparation Method of Corrosion Inhibitors based on Quartz Powders, '' which the inventors pre-applied. ), Two kinds (silicates), and three kinds (complex salts) are classified into one type of phosphoric acid, two kinds of silicate powder or silica sand, and the three kinds of compounds are known to be composites of phosphoric acid and silicic acid. Commercially available sodium silicate (Na ₂ SiO ₃ ) is also a melt of silica sand and sodium carbonate, which is also produced by the dry method and the wet method.

In addition, the SiO ₂ / Na ₂ 0 molar ratio (mol ratio) of sodium silicate (anhydrous powder) is well known that dozens of different types of sodium silicate are scattered in addition to 3.0 to 3.3. It is considered to be a technical standard according to suitable melt condensation of additives.

Prior arts confronting the present invention include Korean Patent Publication Nos. '92 -4017, '94 -24110, '96 -013482, and Publication No. '92 -4017 is made of 80% silica sand powder, which is almost It is considered that there is a disadvantage that it is difficult to dissolve in water because it is close to vitrification. Publication No. 94-24110 uses an additive different from the present invention, and Publication No. 96-013482 is a phosphate series. There is no prior art.

The silicate rust preventive agent of the present invention is a composition of the rust preventive agent that meets the standards of the water treatment agent of the Ministry of Environment, 54% by weight of silica powder or silica sand (SiO ₂ : purity 99.9%), 33% by weight of anhydrous sodium carbonate (Na ₂ CO ₃ ), phosphoric anhydride (P ₂ O ₅ ) 4% by weight, ₅ % by weight of potassium pyrophosphate (K ₄ P ₂ 0 ₇ ), 3% by weight of sodium triphosphate (Na ₅ P ₃ O ₁₀ ), 1% by weight of carbonic acid (K ₂ CO ₃ ) By blending melting, anhydrous sodium carbonate serving as SiO ₂ solubilizer is added and dissolved appropriately,

Sodium silicate (Na ₂ SiO ₃ ) in the form of SiO ₂ + Na ₂ CO ₃ → Na ₂ SiO ₃ + CO ₂ ↑ and soluble in water, the higher the solubility of water, the higher the solubility in water. As the melting temperature and melting time of compounding melting are lowered in proportion to 4 to 5 hours at 1,500 ° C, the manufacturing cost of the product can be reduced. All of the described prior art describe high temperatures of more than 1,600 ° C. and excessive melt times for melting.

The composite salt rust preventive agent of the present invention is a manufacturing method in contrast to the present invention because the prior art application number '98 -32929 is a manufacturing method using the prepared silicate rust preventive agent. Composition of the present invention is silica powder or silica sand (SiO ₂ : purity more than 99.9%) 40% by weight, sodium carbonate (Na ₂ CO ₃ ) 32% by weight, anhydrous phosphoric acid (P ₂ O ₅ ) 5% by weight, potassium pyrophosphate ( K ₄ P ₂ O ₇ ) 13 weight percent blend, 8.5% by weight sodium triphosphate (Na ₅ P ₃ O ₁₀ ), 1% by weight of carbonic acid (K ₂ CO ₃ ), 0.5% by weight of calcium carbonate (CaCO ₃ ) By melting, it is a composite of phosphate and silicate, which has a significant effect of inhibiting corrosion by synergistic action between two materials. It is prevented and harmless to the human body, and has an excellent antirust effect that is nontoxic.

The manufacturing apparatus of the present invention is a ground tunnel type furnace, which maintains a high calorific value by using gas (GAS) fuel without pollution and containing no impurities, and the melt is melted in a graphite crucible to melt impurities or raw materials of refractory materials. It prevents the mixing of foreign matters by erosion of refractory by acid, and the upper part of the furnace is separated, so it is convenient for shaft and partial repair, and it can be manufactured continuously after tapping.

The anti-corrosive preparation method for drinking water of the present invention can be roughly divided into a silicate rust inhibitor and a composite salt rust inhibitor suitable for the Ministry of Environment's water treatment standards.

Sodium carbonate anhydrous (Na ₂ CO ₃ ) and anhydrous phosphoric acid (P ₂ O ₅ ), potassium pyrophosphate (K ₄ P ₃ P ₇ ), sodium triphosphate (Na ₅ P ₃ O ₁₀ ), carbonic carbonate (K ₂ CO ₃ ) By combining and melting calcium carbonate (CaCO ₃ ) respectively, the synergistic action between phosphate and silicate reduces the melting temperature and melting time, contributing to the reduction of production cost, and it does not melt well in water and crumbles after a certain period of time. Compensate for the shortcomings The anti-corrosion effect is raised, increasing the value of the product.

The manufacturing apparatus of the present invention can reduce pollution by using a gas fuel containing no pollution and impurities, can produce a large amount of melt according to the size of the furnace, and impurities and foreign substances are mixed into the melt using a graphite crucible. The purpose is achieved as a manufacturing apparatus having convenience of shaft and maintenance work by separating and assembling the upper end of the furnace.

1 is an embodiment diagram of the rust inhibitor composition of the present invention

Figure 2 is a water treatment standard test results of the rust inhibitor prepared by the rust inhibitor composition of the present invention

3 is a table of rust preventive standards of the Ministry of Environment, Japan Environment Agency

4 is a deposition test and corrosion rate measurement results of the anti-corrosive prepared with the composition of the present invention

5 is a cross-sectional view of the manufacturing apparatus of the present invention.

Figure 6 is a top separation cross-sectional view of the manufacturing apparatus of the present invention

7 is a plan view of the manufacturing apparatus of the present invention

8 is a side view of the manufacturing apparatus of the present invention

9 is a perspective view of the working table is installed in the manufacturing apparatus of the present invention

※ Explanation of reference numerals of the present invention

1. Iron flue 2. Refractory flue 3. Heat storage chamber 4. Graphite crucible 5. H beam

6. Hot water outlet 7. Gas outlet 8. Clasp 9. Steel plate (heavy plate) 10. Fireproof castable

11.Insulation material 12.Burner Settlement 13.Refractory Brick 14.H Beam 15.Hook

16. Raw material input tank 17. Automatic temperature sensor

Hereinafter, the configuration and operation of the present invention with reference to the accompanying drawings.

1 is an embodiment according to the composition of the silicate rust inhibitor of the present invention as a silica powder or silica (SiO ₂ : purity more than 99.9%) 54% by weight, sodium carbonate anhydrous (Na ₂ CO ₃ ) 33% by weight, phosphoric anhydride (P ₂ O ₅ ) 4% by weight, ₅ % by weight of potassium pyrophosphate (K ₄ P ₂ O ₇ ), 3% by weight of sodium triphosphate (Na ₅ P ₃ O ₁₀ ), 1% by weight of carbonic acid (K ₂ CO ₃ ) It was carried out by compounding.

The silica powder and silica sand (SiO ₂ ) have a particle size of about 0.1 mm and are alkalized by melting with anhydrous sodium carbonate (Na ₂ CO ₃ ) to form sodium silicate.

Anhydrous sodium carbonate (Na ₂ CO ₃ ) has a lower melting temperature as the amount added to SiO ₂ , alkali buffering ability, softening hard water, and also plays a role in pH control.

Phosphoric anhydride (P ₂ O ₅ ) is a white amorphous crystal that has iron rust removal and cleaning effect, forms a phosphate coating, is dissolved in water and replaced with phosphorous acid (H ₃ PO ₄ ).

Potassium Pyrophosphate (K ₄ P ₂ O ₇ ) is an alkaline solution, has a strong buffering effect, inorganic surfactant performance, and metal ion blocking action, which is the most stable among condensed phosphates and has high solubility in water. Since it is 11 times of sodium polyphosphate and 30 times of sodium pyrophosphate, it plays an important role in the solubility of rust inhibitors.

Sodium triphosphate (Na ₅ P ₃ O ₁₀ ) makes stable complexes with metal ions in hard water, which effectively softens hard water, disperses and removes corrosion factors of metal surface, and reattaches dispersed dispersion factors. It serves as a preventive metal ion blocker, and also prevents cake formation that becomes agglomerated in the compounding process and increases the corrosion inhibitory effect in the pipe.

Aqueous solution of potassium carbonate (K ₂ CO ₃ ) exhibits strong alkalinity, increases the pH of the rust preventive agent, and improves the commercialization of the rust preventive agent by dehydrating and removing bubbles.

Silicates have long been used as corrosion inhibitors in drinking water systems in Gumi, where they are hydrolyzed in water to produce colloidal particulates that diffuse to form films and the resulting film is formed throughout the pipeline metal. In drinking water treatment systems, 8-16 ppm silica is usually found in water, but this monomer silica has no pipe protection, and the common form of molten silicate rust inhibitor is Na ₂ SiO ₃ , which can be used for corrosion control. It is this glassy amorphous polymer silicate rust inhibitor.

The composite salt rust preventive composition of the present invention is 40% by weight of silica powder or silica sand (SiO ₂ : purity more than 99.9%), 32% by weight of anhydrous sodium carbonate (Na ₂ CO ₃ ), 5% by weight of phosphoric anhydride (P ₂ O ₅ ), fatigue 13 weight% of potassium phosphate (K ₄ P ₂ O ₇ ), 8.5 weight% of sodium triphosphate (Na ₅ P ₃ O ₁₀ ), 1 weight% of carbonic carbonate (K ₂ CO ₃ ), 0.5 weight of calcium carbonate (CaCO ₃ ) It was carried out in the formulation composition of%. Calcium carbonate (CaCO ₃ ) is added only to the composite salt rust preventive agent to increase the strength of the melt to dissolve in water, delayed control of the rapid dissolution of phosphate-based, the performance of the other additives as described above.

Figure 2 shows the results of the water treatment agent loading test of the rust inhibitor prepared by the rust inhibitor composition of the present invention. The results obtained by the atomic absorption method were found to comply with the water treatment standards set by the Ministry of Environment as shown.

Figure 3 shows the water treatment agent specification table of the Ministry of Environment and the Japan Environment Agency.

Figure 4 is a result table of the deposition test and corrosion rate measurement test of the rust inhibitor prepared from the composition of the present invention. The carbon steel specimens were cut into rectangles to form holes at the top with a size of 75mmx13mmx1.2mm. The pretreatment of the specimens was polished with # 180 sandpaper, washed with distilled water and degreased with methanol. 4 is a picture of the test apparatus, the glass rod is placed horizontally on the beaker (A), tied to the upper hole of the specimen (B) as a fishing line, and then placed on an electromagnetic magnetic stirrer (C: 15 spheres) and distilled water Each rust inhibitor was injected and tested for 12 days. Corrosion rate of tap water (City water) is about 20 ~ 25mpy, 2.93mpy was confirmed in distilled water, and as shown in Figure 4, the corrosion inhibitor of the present invention exhibited significantly lower corrosion rate (mpy), the passivation (Passivation) phenomenon It is proved that the rust prevention effect is excellent.

5 is a cross-sectional view of the manufacturing apparatus of the present invention. The upper part is separated as shown in the drawing, the iron plate 9 is manufactured, and the lower part is also made of the iron plate, and the completed hardware is fixed on the steel frame of the H beams 5 and 14. The entire surface is covered with the heat insulating material 11 in the iron plate skeleton, and the fire brick (SK40: refractory degree 1,800 to 2,000 ° C.) is deformed according to the standard, and the bottom surface of the furnace maintains the same slope as the gas burner (GAS BURNER). Fix the studs (12) firmly. A tapping hole 6 is made at 3/5 of the melt area of the furnace to allow the melt to tap. At the bottom of the furnace, the graphite crucible 4 is fixed by refractory mortar, and the heat storage chamber 3 facing the chimney is directly refracted by refractory to be directly connected to the exhaust passage. In addition, the automatic temperature sensor (Senser) is installed next to the raw material inlet of the furnace to automatically detect the temperature in the furnace and connected to the burner automatic temperature control device to cut off and restore the power according to the set temperature.

6 is a cross-sectional view of the separated upper end of the ground tunnel type. Manufacture the skeleton of the upper end with the iron plate (9), fix the clasp (8) that can be moved and lifted by fixing the left and right centers, and the gas outlet (7) to make a straight line with the tap of the lower end of the furnace, Dozens of "a" -type hooks 15 are attached so that the heat insulating material 11 and the refractory castable (10: 1,800 ° C refractory degree) are firmly constructed. The refractory cylinder 2 is fixed with the heat insulating material 11 and the refractory castable 10 to complete the axis of the upper end. After the drying operation, the upper end is lifted using the clasp 8, and the refractory mortar is applied to the joint and the upper and lower ends are assembled to complete the shaft work. The hopper of the raw material feeder is installed at the raw material inlet.

7 is a plan view of the ground tunnel type of the present invention. A screw hopper is installed through the blender 16 to feed raw materials.

8 is a side view of the completed ground tunnel course.

Figure 9 is a perspective view of the workbench installed around the furnace to facilitate the melting operation.

As the above-mentioned ground tunnel type furnace is melted on the surface of graphite crucible where the melt does not touch the refractory, the hygienic quality without refractory impurity is increased, and the upper and lower parts of the furnace are separated, so it is convenient to work on the shaft and repair. Is accomplished.

The preparation method of the anticorrosive for drinking water of the present invention has the advantage of lowering the conventional melting temperature to 1,500 ° C. and doubling the productivity due to the shortening of the melting time by appropriate mixing of additives. Although there was a lot of risk, it has the effect of solubility certainty and antirust effect.

In order to achieve the above object, the manufacturing apparatus of the present invention uses a gas-free fuel, and the bottom of the furnace uses a graphite crucible, and a conventional raw material is melted in a refractory material and melted by erosion of an acid in the raw material. It contains a lot of impurities, but it has been made to compensate for these shortcomings, and it is separated into the top and bottom and has an excellent effect in the shaft and repair work.

Claims (3)

The silicate rust preventive composition includes silica powder or silica sand (SiO ₂ : purity more than 99.9%), 54 weight%, anhydrous sodium carbonate (Na ₂ CO ₃ ) 33 weight%, anhydrous phosphoric acid (P ₂ O ₅ ) 4 weight%, potassium pyrophosphate (K ₄ P ₂ O ₇ ) 5% by weight, 3% by weight sodium triphosphate (Na ₅ P ₃ O ₁₀ ), 1% by weight of carbonic carbonate (K ₂ CO ₃ ) at 4 to 5 hours at a uniform dissolution temperature of 1,500 ℃ Melt netting method of tapping to obtain glassy crystals. The composite anti-corrosive composition is 40% by weight of silica powder or silica sand (SiO ₂ : purity more than 99.9%), 32% by weight of anhydrous sodium carbonate (Na ₂ CO ₃ ), 5% by weight of anhydrous phosphoric acid (P ₂ O ₅ ), potassium pyrophosphate ( 13% by weight of K ₄ P ₂ O ₇ ), 8.5% by weight of sodium triphosphate (Na ₅ P ₃ O ₁₀ ), 1% by weight of carbonic acid (K ₂ CO ₃ ), 0.5% by weight of calcium carbonate (CaCO ₃ ) Melting and rust prevention method which melt | dissolves a compounding | melting temperature 1,500 degreeC, melts in 4 to 5 hours, and obtains a glassy crystal. The melting furnace can be moved as a ground tunnel type furnace, and the upper and lower parts can be separated and combined, the bottom of the melting chamber is installed with a graphite crucible, the melting temperature is controlled at 1,500 ° C, and the melt is heated to the tapping outlet. Anti-rust manufacturing apparatus using a gas burner.