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1.发明授权Chemical beneficiation of phosphatic limestone and phosphate rock with .alpha.-hydroxysulfonic acids 失效磷酸盐石灰石和磷酸盐岩与α-羟基磺酸的化学选矿
公开(公告)号：US4238459A
公开(公告)日：1980-12-09
申请号：US49513
申请日：1979-06-18
摘要： A method of selectively extracting calcite and dolomite away from apatite in phosphate rock or phosphatic limestone wherein the phosphate rock or phosphatic limestone is treated with a mixture of sulfur dioxide, water, and a carbonyl compound. Solids are separated from the liquid phase. The solids consist principally of apatite admixed with clay, quartz, and other accessory minerals originally in the rock. The solids are heated to drive off adhering sulfur dioxide, water, and carbonyl. The liquid phase consists of carbonyl, water, sulfur dioxide, and magnesium and calcium ions. Heating this liquid preferentially precipitates CaSO.sub.3.1/2H.sub.2 O. This solid is filtered off and the filtrate further heated to precipitate MgSO.sub.3.3H.sub.2 O largely free of CaSO.sub.3.1/2H.sub.2 O. All off gas and filtrate is returned to the process.
摘要翻译： 在磷酸盐岩或磷酸盐石灰石中，从磷灰石中选择性提取方解石和白云石的方法，其中用二氧化硫，水和羰基化合物的混合物处理磷酸盐岩或磷酸盐石灰石。 固体与液相分离。 固体主要包括与岩石中的粘土，石英和其他辅助矿物混合的磷灰石。 将固体加热以除去粘附的二氧化硫，水和羰基。 液相由羰基，水，二氧化硫，镁和钙离子组成。 加热该液体优先沉淀CaSO3.1 / 2H2O。 将该固体滤出，滤液进一步加热以沉淀出大部分不含CaSO3.1 / 2H2O的MgSO3.3H2O。 所有废气和滤液都返回过程。
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2.发明授权Chemical beneficiation of phosphatic limestone and phosphate rock with .alpha.-hydroxysulfonic acids 失效磷酸盐石灰石和磷酸盐岩与α-羟基磺酸的化学选矿
公开(公告)号：UST988006I4
公开(公告)日：1979-11-06
申请号：US940940
申请日：1978-09-11
摘要： A method of selectively extracting calcite and dolomite away from apatite in phosphate rock or phosphatic limestone wherein the phosphate rock or phosphatic limestone is treated with a mixture of sulfur dioxide, water, and a carbonyl compound. Solids are separated from the liquid phase. The solids consist principally of apatite admixed with clay, quartz, and other accessory minerals originally in the rock. The solids are heated to drive off adhering sulfur dioxide, water, and carbonyl. The liquid phase consists of carbonyl, water, sulfur dioxide, and magnesium and calcium ions. Heating this liquid preferentially precipitates CaSO.sub.3.1/2H.sub.2 O. This solid is filtered off and the filtrate further heated to precipitate MgSO.sub.3.3H.sub.2 O largely free of CaSO.sub.3.1/2H.sub.2 O. All offgas and filtrate is returned to the process. Examination of extraction results shows that high temperature extraction favors dolomite extraction and low temperature extraction favors apatite extraction. Thus, operating at elevated temperature allows dolomite to be selectively extracted from the apatite in phosphate rock.
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