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鋯精礦質(zhì)量因資源而異，尚無國際通用標(biāo)準(zhǔn)，故各生產(chǎn)國所屬公司或廠家均根據(jù)其資源特點(diǎn)及用戶要求制定各自標(biāo)準(zhǔn)。我國鋯精礦國家標(biāo)準(zhǔn)見下表。 中國鋯英石精礦國家標(biāo)準(zhǔn)
級別
[1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20] [21] [22] [23] [24] [25] [26] [27] [28] [29] [30] [31] [32] [33] [34] [35] [36] [37] [38] [39] [40] [41] [42] [43] 下一頁
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