Nodular cast iron pipe anti-corrosion lining for conveying drinking water and manufacturing method

A technology for ductile iron pipes and drinking water, which is applied to devices and coatings for coating liquid on the surface, which can solve problems such as human hazards, increased aluminum content in water quality, and increased pH value of small-diameter pipes, so as to improve service life , slow down the dissolution, reduce the effect of porosity

CN112159181AInactive Publication Date: 2021-01-01XINXING DUCTILE IRON PIPES CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2021-01-01
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a nodular cast iron pipe anti-corrosion lining for conveying drinking water and a manufacturing method, the nodular cast iron pipe anti-corrosion lining is made of cement mortar, the cement mortar is made of cement, water, sand and additives, the cement comprises the following concrete components by mass: 25%-70% of cement clinker and gypsum, 10%-70% of superfine slag powder, 5%-20% of silica fume powder. The cement clinker comprises the following main mineral components in percentage by mass: 30%-65% of C3S, 10%-50% of C2S, less than or equal to 10% of C3A, less than or equal to 1.5% of free calcium oxide fCaO and less than or equal to 1% of (Na2O + 0.658 K2O). According to the anti-corrosion lining disclosed by the invention, the strength of the cement mortar lining is improved, and the porosity of the lining is reduced, so that the rising of the pH value of water and the rising of the aluminum content caused by the precipitation of calcium and aluminum hydrates in the water delivery process of the cement mortar lining are reduced, and the corrosion resistance of the lining and the hygienic performance of the water are improved.
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Description

technical field

[0001] The invention relates to the technical field of pipeline cement mortar lining, in particular to an anticorrosion lining of a ductile iron pipe used for transporting drinking water. Background technique

[0002] As an excellent water delivery pipe, ductile iron pipe has been widely used in water delivery network projects. Compared with other pipes, ductile iron pipes have the advantages of excellent mechanical properties, excellent corrosion resistance, good sealing performance, low accident rate, and low leakage rate.

[0003] The cement mortar lining has good anti-corrosion performance and belongs to active anti-corrosion. However, most of the commercially available cements are construction cements, and there is no cement used for cement products in contact with drinking water. Since construction cement is mostly used in reinforced concrete structures, the alkalinity of the cement is required to form a passive film on the surface of the steel bar to...

Examples

Embodiment Construction

[0026] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0027] Detect CaO and SiO according to the method of GB / T 176 2 、Al 2 o 3 , Fe 2 O3, f-CaO, Na 2 O and K 2 O and other chemical components, and then calculate the mineral composition according to the formulas in Table 1 and Table 2 in GB / T21372-2008. Three kinds of cement clinkers with different mineral compositions were selected, and the main mineral compositions and components of each clinker are shown in Table 1 below. Six kinds of cement with different proportions were prepared according to the ratios in Table 2. The speci...