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针对四川攀西 ｗ（ ＭｎＯ） ＝ ８－２ ％ 的稀土矿泥，采用ＳＯ２ 作还原剂，在２００ Ｌ 反应釜中进行预脱锰，在ｎ（ＳＯ２） ｎ（ Ｍｎ） ＝ ２－４ ，ＬＳ＝ ３∶１ 的条件下，锰的浸出率为７０ ％ 以上，而稀土及铁的浸出率分别小于１ ％ 及３ ％ 。锰浸出液除杂后采用碳酸氢铵沉淀得到碳酸锰产品， 产品纯度达到９６－７８ ％ 。脱锰矿泥与氯化铵按ｍ（ＮＨ４ Ｃｌ） ｍ（ 矿泥） ＝ ０－２ ～０－３ 混合，在５２０ ℃下焙烧２－５ ｈ ，稀土浸出率达到８０ ％ 以上，比原矿泥直接氯化焙烧的回收率提高约４０ ％ 。
According to the rare earth slime with 8 ~ 2% Mn in Panxi, Sichuan Province, pre-demineralization was carried out in 200 L reactor using SO2 as reductant, Under the conditions of LS = 3:1, the leaching rate of manganese is over 70%, while the leaching rates of rare earth and iron are less than 1% and 3% respectively. Manganese leaching solution after impurity removal using ammonium bicarbonate precipitation manganese carbonate products, the product purity of 96-78%. Manganese-mined slime and ammonium chloride are mixed according to m (NH4Cl) m (slime) = 0-2 ~ 0-3, calcined at 520 ℃ for 2-5 h, and the leaching rate of rare earth reaches more than 80% Direct chlorination roasting recovery rate increased by about 40%.