執(zhí)行器IC20-30Q3T芯科技，芯創(chuàng)新；88200181
當(dāng)溶液中有四價(jià)鈦被復(fù)原成三價(jià)鈦時(shí)，溶液會(huì)從土黃色變?yōu)樽虾谏?，這是因?yàn)槿芤褐械娜齼r(jià)鈦實(shí)踐上是Ti2(SO4)36H2O的紫黑色絡(luò)合物。國(guó)外也有在復(fù)原器中復(fù)原，復(fù)原器是一塔式襯膠設(shè)備，內(nèi)盛鐵屑鈦液在塔內(nèi)用泵循環(huán)至到達(dá)要求時(shí)停止。復(fù)原是一個(gè)放熱反響，過(guò)早參加復(fù)原劑不只使鐵與硫酸反響生成的強(qiáng)復(fù)原劑——?dú)鋪G失較多，還會(huì)因溫度升高構(gòu)成鈦液安穩(wěn)性下降，假如礦粉中的Fe2O3含量很高，為了避免反響放熱較多，復(fù)原劑可分批參加，一般操控復(fù)原時(shí)溫升不大于6℃。
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又如焊接鋼管公稱(chēng)口徑25mm的壁厚有3.25mm的普通鋼管和4mm的加厚鋼管。鋼材重量1.鋼材的理論重量鋼材的理論重量是按鋼材的公稱(chēng)尺寸和密度(過(guò)去稱(chēng)為比重)計(jì)算得出的重量稱(chēng)之為理論重量。這與鋼材的長(zhǎng)度尺寸、截面面積和尺寸允許偏差有直接關(guān)系。由于鋼材在制造過(guò)程中的允許偏差，因此用公式計(jì)算的理論重量與實(shí)際重量有一定出入，所以只作為估算時(shí)的參考。鋼材的實(shí)際重量鋼材實(shí)際重量是指鋼材以實(shí)際稱(chēng)量(過(guò)磅)所得的重量，稱(chēng)之為實(shí)際重量。
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