摘要:
L'invention concerne la coulée d'un métal non ferreux à partir d'un bac répartiteur métallique (1) vers des moules récepteurs L sous forme d'un jet libre. Selon le procédé on crée, à l'aide d'un capot (12) recouvrant les moules récepteurs (7B, 7C), une zone d'isolement par rapport à l'ambiance et, à l'aide d'une rampe (23) d'alimentation et de distribution d'un gaz inerte liquifié, on inerte cette zone préalablement à/et pendant la coulée. Le procédé s'applique notamment à la coulée continue du zinc en lingotière.
摘要:
A method is disclosed for treating dore slag resulting from smelting of a dore furnace charge, by grinding such slag and then subjecting the obtained pulp to froth flotation in the presence of a suitable frother and collector to produce a precious metals concentrate which is then filtered and returned to the dore furnace with the next charge. The tails from the froth flotation may then be finely ground and subjected to several additional flotation stages to improve recovery of the precious metals, and the entire operation is preferably carried out as a closed loop process so that only the tailings from the rougher flotation are removed and shipped to the smelter.
摘要:
An improvement in a process for selectively removing iron in a ferric state from a sulfate leach solution is disclosed. The improvement comprises selectively oxidizing ferrous ions present in the solution to the ferric state by adding an essentially stoichiometric amount of a peroxosulfuric compound to the solution.
摘要:
A zinc powder for use in a zinc anode, negative electrode or electrochemical cell comprising zinc metal or zinc alloy particles. The zinc particles have a narrow particle size distribution and a major portion of the having a well controlled chemistry and specific shape, such as teardrop, strand teardrop, acicular or spherical thereby providing improved discharge characteristics and reduced gassing. The powder can be produced by impulse atomisation.
摘要:
The present invention is concerned with a process information and maintenance system for monitoring, visualizing, triaging and maintaining all control loops of a distributed control system. It gives the users the number of control loops in the plant, the number of loops that are routinely in manual mode, which loops are frequently in alarm, which loops need tuning, etc.
摘要:
The present invention is concerned with a probe (12) assembly for plasma blasting or fragmenting a substance such as rock, concrete and the like. The probe assembly contains a probe made of two coaxial electrodes (26, 28) separated by dielectric material (38); a termination box (13) secured to the probe and coupled to an energy storage module, and containing electrical connections between the probe and the energy storage module; and dampening means (14) for dampening the movement of the termination box and the probe after a blast.
摘要:
The present invention is concerned with a method for electrorefining silver in a Moebius cell whereby the anode is completely dissolved and the gold mud is removed without handling of any partially dissolved anodes. The cell is conventional except that the anodes are placed in a basket (10) made of a thermoplastic material and surrounded by a cloth, the electrical contact between the anode and the power source takes place outside the electrolyte. The bottom of the basket is provided with apertures allowing the gold mud produced to fall into the cloth until the anode is completely dissolved.
摘要:
A process for the removal of cobalt impurities from zinc sulphate solution is disclosed. The process comprises the step of carrying out cementation of the cobalt impurities on zinc dust in a high pressure vessel at a temperature between 98°C and about 150°C, preferably between 120 and 130°C.
摘要:
A method of increasing the extraction of tellurium from copper electrorefining slime comprises leaching the slime with dilute sulphuric acid in a reactor under a partial oxygen pressure of up to 150 psi and at an elevated temperature between about 100 and 200°C until copper, nickel and substantially all of the tellurium is dissolved, thereby forming a leach slurry, and contacting the slurry with an appropriate reducing agent immediately after the leaching operation has been halted and the leaching reactor brough back to atmospheric pressure to reprecipitate any excessive quantities of silver and selenium solubilized during the leaching operation.