Tianjin, Tuam Tshoj, tuav 85% ntawm cov khoom lag luam fluorspar, muab qhov chaw ntseeg siab rau cov tuam txhab xav tau cov pob zeb tseem ceeb no.Los ntawm kev muab Fluorite (CaF2: min 85%, SiO2: max 13%, S: max 0.02%, P: max 0.02%), cov neeg siv khoom tuaj yeem ntseeg tau tias lawv tau txais cov khoom zoo ...
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