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Komatsu General Atomics Engineering Corporation* in 1998 introduced a technology developed in the U.S. designed to clean soil contaminated with heavy metals, and since then has successfully expanded its activities in the cleanup busi- ness.
This metal-contaminated soil-treatment technology turns toxic heavy metals, which are present in the soil, into a water-insoluble, nontoxic mineral as an apatite. In this way, they are prevented from leaching into and contaminating external media. One of the typical apatite minerals is apatite hydroxide Ca5(PO4)3OH. Metals with positive ions, such as lead (Pb), can infiltrate the apatite hydroxide structure replacing calcium (Ca), thus turning the apatite into Ca5-n Pbn(PO4)3OH (where n is 5 or less).
Komatsu WA380-6H Operation and Maintenance Pdf Manual
The resultant isomorphous apatite naturally exhibits the fundamental characteristics of apatite minerals. Unlike the conventional, chemically insoluble treatment, however, the material turns into a very hard mineral crystal with great leaching resistance over a wide pH range. Furthermore, com- pared to the cement-fixation method, this treatment barely affects the condition of a medium like soil.
In 1998, we undertook a consigned research study on behalf of the Environmental Agency to establish a soil-conta- mination cleanup technology and verify its feasibility. The results of that study proved the advantages of apatite cleanup over chemically insoluble treatments, which heretofore had been the conventional cleanup method for soils contami- nated with heavy metals. In fiscal 1999, the technology was