Calcined kaolin originated nyob rau hauv lub tebchaws United States, pib los tshem tawm cov organic carbon nqi nyob rau hauv mos kaolin thiab txhim kho cov whiteness ntawm cov khoom.Tom qab ntawd, tib neeg siv txoj kev no los ua cov txheej txheem thee-ntsuas kaolin, thiab tsim cov khoom lag luam nrog kev ua tau zoo, qib siab, thiab tus nqi siab dua li ordin...
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