Abstract: Process for gold and/or platinum group metals heap leaching comprising irrigating a heap (1) with an irrigation solution (9, 10, 11 & 12) containing sodium cyanide for leaching gold and/or platinum group metals from said gold and/or platinum group metals containing ore where a lime reagent addition (B) by feeding a fine particle lime suspension containing lime particles in an aqueous phase is done in the irrigation solution.

Abstract: The present invention is related to an installation and to a method for recirculating and mixing a fluid which is preferably a shear-thinning fluid. The installation comprises a tank, a pump, a piping assembly connected to the pump and comprising an injection piping for injecting said fluid into the tank and a return piping coupled to the injection piping for pumping the said fluid from the tank to the injection piping, wherein the piping assembly and the tank form a flow recirculation path in which fluid is homogenized by recirculation of the fluid upon action of the said pump, the injection piping being designed such as to reinject the fluid in at least two peripheral bottom locations with an horizontal and/or inclined orientation such as to create a swirl movement in the tank and to reinject simultaneously said fluid upwardly through a central location in a zone comprised between the central axis of the tank and the half radius of the tank such as to create a jet of fluid having a main vertical component.

Abstract: A method is shown for forming a high solids reactive lime slurry from quicklime. The timely addition of a carbohydrate and antiscalant polymer to slaking water provides desirable degree of control over the rate of reaction in which the heat of reaction is moderated to ensure the antiscalant polymer remains intact, thereby producing a fine quicklime slurry with low and stable viscosity.

Abstract: Process for gold and/or platinum group metals heap leaching comprising irrigating a heap with an irrigation solution containing sodium cyanide for leaching gold and/or platinum group metals from a gold and/or platinum group metals containing ore. A lime reagent is added by feeding a fine particle lime suspension containing lime particles in an aqueous phase in an irrigation solution.

Abstract: A process is shown for manufacturing a milk of lime of great fineness which includes at least the steps of providing one lime compound chosen in the group consisting of prehydrated lime, a paste of lime obtained by addition of water to quicklime instead of addition of quicklime to water and their mixture, and forming a milk of slaked lime of great fineness with the chosen lime compound. The paste of lime is obtained by progressive addition of water to quicklime under agitation conditions.

Abstract: A calcium hydroxide slurry is formed by combining a polymer additive with lime and water to form an aqueous slurry. The slurry so produced is viscostable, resists hard packing even after prolonged storage, is easily redispersed and has antiscaling properties. The amount of lime used is between 35 to 55% by weight of the slurry. The polymer additive is a polycarboxylate dispersing agent and is added in an amount between about 0.1 to 3% by weight of lime.

Abstract: A process is shown for manufacturing a milk of lime of great fineness which includes at least the steps of providing one lime compound chosen in the group consisting of prehydrated lime, a paste of lime obtained by addition of water to quicklime instead of addition of quicklime to water and their mixture, and forming a milk of slaked lime of great fineness with the chosen lime compound. The paste of lime is obtained by progressive addition of water to quicklime under agitation conditions.