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公开(公告)号：EP1628913B1
公开(公告)日：2007-02-21
申请号：EP04734862.8
申请日：2004-05-26
IPC分类号： C01B25/00
CPC分类号： B09C1/02 , C01B25/01 , C01B25/02 , C02F1/5281 , C02F1/56 , C02F9/00 , C02F11/121 , C02F2101/105 , C02F2103/10 , C22B3/44 , C22B7/006 , Y02P10/214 , Y02P10/23 , Y02P10/234 , Y10S210/908
摘要： A process is disclosed for recovering elemental phosphorus from an aqueous sludge and converting the residue into non-hazardous waste. The sludge is separated into (1) a slurry of water containing suspended phosphorus and dirt particles and (2) coarse solids. A flocculating agent is added to the slurry to agglomerate the suspended phosphorus and dirt particles, which are recovered from the water and are heated to melt elemental phosphorus. A coalescing agent is added to coalesce the melted elemental phosphorus, which is separated from the dirt particles. The coarse solids are mixed with hot water to melt the phosphorus sludge in it, which is then separated from inert solids. The solids are heated to burn any residual elemental phosphorus. The separated molten phosphorus sludge is stirred with a solution of chromic acid to recover the phosphorus as a separate phase. A reducing agent is added to the remaining water and solids to reduce the Cr to Cr . Finally, an alkali is added to the water and solids to react the residual phosphorus and form phosphorous compounds. The reaction mass is filtered and the filter cake can be placed in a landfill as a non-hazardous waste.
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公开(公告)号：EP1230151B1
公开(公告)日：2007-08-29
申请号：EP00974692.6
申请日：2000-11-10
发明人： STURDIVAN, Charles, N. , LUXBACHER, George, Walter , SARAN, Mohan, Singh , PRICE, Kenneth, Raburn
摘要： A separator for separating a meltable solid from a mixture with other solids has a tank for holding a fluid; a container at least partially inside the tank, made at least in part of a screen through which the fluid can pass and melted solids can flow, but through which the unmelted solid material will not flow; and a heater for heating the fluid above the melting point of the meltable solids. In a method of separating a meltable solid from a mixture with other solids the mixture of solids is placed in the container of the separator and the fluid is heated to a temperature above the melting point of the meltable solid, whereby the meltable solid flows through the screen out of the container, while the other solids remain within the container.
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公开(公告)号：EP1628913A2
公开(公告)日：2006-03-01
申请号：EP04734862.8
申请日：2004-05-26
IPC分类号： C01B25/00
CPC分类号： B09C1/02 , C01B25/01 , C01B25/02 , C02F1/5281 , C02F1/56 , C02F9/00 , C02F11/121 , C02F2101/105 , C02F2103/10 , C22B3/44 , C22B7/006 , Y02P10/214 , Y02P10/23 , Y02P10/234 , Y10S210/908
摘要： A process is disclosed for recovering elemental phosphorus from an aqueous sludge and converting the residue into non-hazardous waste. The sludge is separated into (1) a slurry of water containing suspended phosphorus and dirt particles and (2) coarse solids. A flocculating agent is added to the slurry to agglomerate the suspended phosphorus and dirt particles, which are recovered from the water and are heated to melt elemental phosphorus. A coalescing agent is added to coalesce the melted elemental phosphorus, which is separated from the dirt particles. The coarse solids are mixed with hot water to melt the phosphorus sludge in it, which is then separated from inert solids. The solids are heated to burn any residual elemental phosphorus. The separated molten phosphorus sludge is stirred with a solution of chromic acid to recover the phosphorus as a separate phase. A reducing agent is added to the remaining water and solids to reduce the Cr+6 to Cr+3. Finally, an alkali is added to the water and solids to react the residual phosphorus and form phosphorous compounds. The reaction mass is filtered and the filter cake can be placed in a landfill as a non-hazardous waste.
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公开(公告)号：EP1237816A1
公开(公告)日：2002-09-11
申请号：EP00982729.6
申请日：2000-07-27
IPC分类号： C01B25/027
CPC分类号： C01B25/027 , Y10S210/906
摘要： Disclosed is a method of recovering elemental phosphorus from a sludge that contains water, dirt, and elemental phosphorus. In the first step, the sludge is melted. A mixture is formed of the melted sludge and about 0.5 to about 3 wt% of an oxidizing agent, based on the weight of said elemental phosphorus in the sludge, and about 75 to about 400 wt% water, based on the weight of the sludge. The mixture is stirred until a continuous elemental phosphorus phase forms. The purified phosphorus phase is separated from the mixture.
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公开(公告)号：EP1230151A1
公开(公告)日：2002-08-14
申请号：EP00974692.6
申请日：2000-11-10
发明人： STURDIVAN, Charles, N. , LUXBACHER, George, Walter , SARAN, Mohan, Singh , PRICE, Kenneth, Raburn
摘要： A separator for separating a meltable solid from a mixture with other solids has a tank for holding a fluid; a container at least partially inside the tank, made at least in part of a screen through which the fluid can pass and melted solids can flow, but through which the unmelted solid material will not flow; and a heater for heating the fluid above the melting point of the meltable solids. In a method of separating a meltable solid from a mixture with other solids the mixture of solids is placed in the container of the separator and the fluid is heated to a temperature above the melting point of the meltable solid, whereby the meltable solid flows through the screen out of the container, while the other solids remain within the container.
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