| 摘要 |
A preparation method of steel pipe coating material containing magnetite is provided to obtain the coating material with high specific gravity sufficient to prevent buoyancy of a steel pipe and to ensure improvement of durability of the steel pipe and the coating material by adding magnetite(Fe3O4) with weight similar to that of hematite(Fe2O3) to the coating material. The method comprises: first step of crushing gathered sand into granules having particle size of 10mm or less; second step of crushing magnetite(Fe3O4) (including trace elements such as silver, copper, lead and zinc) ore into granules having particle size of 25mm or less; and third step of admixing 280-618kg/m^3 of cement, 0-1750kg/m^3 of the prepared sand granules from the first step, 100-2215kg/m^3 of the prepared Fe3O4 granules (including trace elements such as silver, copper, lead and zinc) from the second step, 113-275kg/m^3 of water and 4.7-9.13kg of admixture additive to form the resultant coating material.
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