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公开(公告)号：US11118244B2
公开(公告)日：2021-09-14
申请号：US15951615
申请日：2018-04-12
摘要： Process for recovering one or both of copper and silver from a sulphidic feed containing iron, arsenic, copper and silver by pressure oxidizing an aqueous feed slurry of the sulphidic feed in a pressure vessel to form a liquid phase containing free sulphuric acid and aqueous copper sulphate, and to precipitate arsenic as solid iron arsenic compounds. The process includes operating the pressure vessel at a sufficiently low solids content to maintain a free acid level below 30 g/L in the liquid phase, and providing sufficient heat to maintain a temperature in the pressure vessel above 200° C. Copper metal is recovered from the liquid phase and/or silver may be recovered from the solids by cyanide leaching without the need for a jarosite destruction step.
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公开(公告)号：US10544482B2
公开(公告)日：2020-01-28
申请号：US15202084
申请日：2016-07-05
摘要： Process to recover copper from a process feed including one or more feed components containing a base metal sulphidic feed, iron, copper and arsenic. Process feed and aqueous quench solution are introduced to a pressure oxidative leaching step with a partial pressure of oxygen above 200 kPa to form free sulphuric acid, to solubilize copper and other metal in the feed as aqueous sulphate compounds and to precipitate arsenic as solid iron arsenic compounds. A treated slurry comprising a liquid phase containing sulphuric acid and copper sulphate, and solids containing the iron arsenic compounds is withdrawn and the liquid phase is separated from the solids. To lessen arsenic re-dissolution and to maintain stability of the solid iron arsenic compounds, one or more of temperature, free acid level and residence time of the treated slurry is controlled. Copper metal is recovered from the separated liquid phase.
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公开(公告)号：US10449607B2
公开(公告)日：2019-10-22
申请号：US15293980
申请日：2016-10-14
发明人： Fu Qin
IPC分类号： B22F9/26 , B22F9/24 , C01G3/10 , C01G51/10 , C01G53/10 , C01G51/04 , C01G53/04 , C01G3/02 , C22B3/00
摘要： Process to decrease silicon content of metal powder produced by hydrogen reduction from ammoniacal ammonium sulphate solutions containing metal ammine complexes, wherein metal (Me) is Ni, Co, or Cu. The process controls the precipitation of metal hydroxide, which is found to be an effective scavenger for silicon. Silicon is preferentially removed from metal diammine sulphate-containing solutions by precipitating with a small amount of a metal hydroxide, and then separating the silicon-bearing metal hydroxide precipitate from the solution. This solution, from which the silicon impurity has been removed with the metal hydroxide precipitate, can then be reduced in one or more densification cycles with a reducing gas to produce an elemental metal powder having a decreased silicon content. Alternatively, the solution is reduced to produce a low silicon metal powder seed material for the first of the one or more densification cycles.
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公开(公告)号：US20230076620A1
公开(公告)日：2023-03-09
申请号：US17458203
申请日：2021-08-26
摘要： An integrated pressure leaching, heap leaching process for recovering copper from sulphidic feed containing iron, arsenic, and copper. Aqueous feed slurry of the sulphidic feed is pressure oxidized to form a liquid phase containing free sulphuric acid and aqueous copper sulphate, and to precipitate arsenic as solid iron arsenic compounds. Treated slurry is withdrawn from the pressure vessel and the liquid phase is separated from the solids. Copper is recovered from the separated liquid phase and generates a solution enriched in acid and depleted in copper. At least a portion of this solution is neutralized in a copper heap leach to produce a PLS containing copper and reduced in acid. At least a portion of the heap leach PLS is neutralized to produce a solution further reduced in acid, and solids containing copper precipitates, followed by a liquid solid separation. The solution further reduced in acid is recycled as process solution for the pressure leach, while the solids containing copper precipitates are recycled to combine with either the treated slurry from the pressure leach, or the liquid phase from liquid solid separation, to re-dissolve copper and other metal values. The solids from the latter step are separated and the liquid phase is fed to copper recovery.
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公开(公告)号：US20170106450A1
公开(公告)日：2017-04-20
申请号：US15293980
申请日：2016-10-14
发明人： Fu QIN
CPC分类号： B22F9/24 , B22F9/26 , B22F2009/245 , B22F2201/013 , B22F2301/10 , B22F2301/15 , B22F2998/10 , B22F2999/00 , C01G3/02 , C01G3/10 , C01G51/04 , C01G51/10 , C01G53/04 , C01G53/10 , C22B23/0461
摘要： Process to decrease silicon content of metal powder produced by hydrogen reduction from ammoniacal ammonium sulphate solutions containing metal ammine complexes, wherein metal (Me) is Ni, Co, or Cu. The process controls the precipitation of metal hydroxide, which is found to be an effective scavenger for silicon. Silicon is preferentially removed from metal diammine sulphate-containing solutions by precipitating with a small amount of a metal hydroxide, and then separating the silicon-bearing metal hydroxide precipitate from the solution. This solution, from which the silicon impurity has been removed with the metal hydroxide precipitate, can then be reduced in one or more densification cycles with a reducing gas to produce an elemental metal powder having a decreased silicon content. Alternatively, the solution is reduced to produce a low silicon metal powder seed material for the first of the one or more densification cycles.
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公开(公告)号：US20170009318A1
公开(公告)日：2017-01-12
申请号：US15202084
申请日：2016-07-05
CPC分类号： C22B15/0071 , C22B1/02 , C22B3/08 , C22B3/22 , C22B7/007 , C22B15/0013 , C22B15/0086 , C25C1/12 , Y02P10/216 , Y02P10/234 , Y02P10/236
摘要： Process to recover copper from a process feed including one or more feed components containing a base metal sulphidic feed, iron, copper and arsenic. Process feed and aqueous quench solution are introduced to a pressure oxidative leaching step with a partial pressure of oxygen above 200 kPa to form free sulphuric acid, to solubilize copper and other metal in the feed as aqueous sulphate compounds and to precipitate arsenic as solid iron arsenic compounds. A treated slurry comprising a liquid phase containing sulphuric acid and copper sulphate, and solids containing the iron arsenic compounds is withdrawn and the liquid phase is separated from the solids. To lessen arsenic re-dissolution and to maintain stability of the solid iron arsenic compounds, one or more of temperature, free acid level and residence time of the treated slurry is controlled. Copper metal is recovered from the separated liquid phase.
摘要翻译： 从包括一种或多种含有贱金属硫化物进料，铁，铜和砷的进料组分的工艺进料中回收铜的方法。 将工艺进料和水性淬火溶液引入到氧分压超过200kPa的压力氧化浸出步骤中以形成游离硫酸，以使硫酸盐化合物溶解在进料中的铜和其它金属，并将砷沉淀为固体铁砷 化合物。 包括含有硫酸和硫酸铜的液相和含有铁砷化合物的固体的处理浆液被取出，液相与固体分离。 为了减少砷的再溶解并保持固体砷化砷的稳定性，控制处理过的浆料的温度，游离酸水平和停留时间中的一种或多种。 从分离的液相中回收铜金属。
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公开(公告)号：US11584975B1
公开(公告)日：2023-02-21
申请号：US17458203
申请日：2021-08-26
摘要： An integrated pressure leaching, heap leaching process for recovering copper from sulphidic feed containing iron, arsenic, and copper. Aqueous feed slurry of the sulphidic feed is pressure oxidized to form a liquid phase containing free sulphuric acid and aqueous copper sulphate, and to precipitate arsenic as solid iron arsenic compounds. Treated slurry is withdrawn from the pressure vessel and the liquid phase is separated from the solids. Copper is recovered from the separated liquid phase and generates a solution enriched in acid and depleted in copper. At least a portion of this solution is neutralized in a copper heap leach to produce a PLS containing copper and reduced in acid. At least a portion of the heap leach PLS is neutralized to produce a solution further reduced in acid, and solids containing copper precipitates, followed by a liquid solid separation.
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公开(公告)号：US20170306252A1
公开(公告)日：2017-10-26
申请号：US15496921
申请日：2017-04-25
CPC分类号： C10G65/10 , C10G45/00 , C10G45/58 , C10G47/00 , C10G47/04 , C10G47/06 , C10G47/26 , C10G49/12 , C10G65/00
摘要： A process is provided to partially upgrade heavy oil using two or more reaction zones connected in series, each reaction zone being a continuous stirred tank maintained at hydrocracking conditions. The heavy oil feedstock and a solid particulate catalyst are stirred to form pumpable slurry which is heated to a target hydrocracking temperature and then continuously fed to the first reaction zone. Hydrogen is continuously introduced to the reaction zone to achieve hydrocracking and to produce a volatile vapour stream carried upwardly by the hydrogen to produce an overhead vapour stream. The hydrocracked heavy oil slurry from one reaction zone is fed to a next reaction zone also maintained under hydrocracking conditions with a continuous hydrogen feed to produce a volatile vapour stream. The overhead vapour stream from each reactor zone is continuously removed, and the hydrocracked heavy oil slurry from the last of the reaction zones is removed.
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公开(公告)号：US20160010176A1
公开(公告)日：2016-01-14
申请号：US14773152
申请日：2014-03-05
发明人： James BUDAC , Russ KOFLUK , Sandy MANKASINGH , Robin KALANCHEY
CPC分类号： C22B23/0438 , C22B3/065 , C22B7/00 , C22B23/00 , C23F1/28 , C23F1/44 , Y02P10/212
摘要： There is provided a method of recovering at least one target metal which is adhered to a stainless steel surface, while mitigating corrosion to the stainless steel surface. The target metal is nickel or cobalt. The method comprises contacting an operative aqueous treatment solution with an operative solid material adhered to a stainless steel surface. The target metal is nickel or cobalt. The operative solid material includes at least one target metal, and at least a fraction of the at least one target metal of the operative solid material is disposed in metallic form. The operative aqueous treatment solution includes soluble treatment material, wherein the soluble treatment material includes nitric acid and copper-comprising material.
摘要翻译： 提供了一种回收至少一种目标金属的方法，其粘附到不锈钢表面上，同时减轻对不锈钢表面的腐蚀。 目标金属是镍或钴。 该方法包括使可操作的水性处理溶液与粘附到不锈钢表面的可操作固体材料接触。 目标金属是镍或钴。 手术固体材料包括至少一种目标金属，并且至少一部分操作固体材料的至少一种目标金属以金属形式设置。 操作性水处理溶液包括可溶性处理材料，其中可溶性处理材料包括硝酸和含铜材料。
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公开(公告)号：US20220267877A1
公开(公告)日：2022-08-25
申请号：US17184480
申请日：2021-02-24
发明人： Jan SMIT , Preston Carl HOLLOWAY , Michael Joseph COLLINS , Alain TSHILOMBO , Nigel Edwin TUFFREY
摘要： A process to recover nickel, cobalt and copper by co-processing copper-containing sulphide concentrate feed containing one or more of arsenic, antimony, and bismuth, and laterite ore feed containing nickel and cobalt by pressure oxidative leaching. The sulphide concentrate and oxygen are controlled to produce sulphuric acid to leach nickel, cobalt, copper and acid soluble impurities into a liquid phase of an acidic leach slurry, to precipitate iron compounds and a majority of the arsenic, antimony and bismuth as solids, and to produce heat to heat the incoming feeds to a temperature above 230° C. Reacted slurry is withdrawn, solids are separated, and the PLS solution contains the nickel, cobalt, copper and acid soluble impurities. A first solution purification stage on the PLS neutralizes free acid, precipitates one or more of iron, aluminum, chromium and silicon, and, separates as solids, the precipitated impurities and other solids from a first purified solution. Copper is separated from the first purified solution with a solvent extraction step to produce a raffinate solution reduced in copper and a copper loaded organic phase. The organic phase is stripped and copper is recovered with electrowinning. A second solution purification stage is conducted on the raffinate by one or both of neutralizing free acid and precipitating one or more of iron, aluminum, chromium and silicon, followed by separating as solids, the precipitated impurities and other solids from a second purified solution. Nickel and cobalt are recovered as mixed hydroxides or mixed sulphides from the second purified solution.
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