Patent application number | Description | Published |
20140170040 | NICKEL RECOVERY LOSS REDUCTION METHOD, HYDROMETALLURGICAL METHOD FOR NICKEL OXIDIZED ORE, AND SULFURATION TREATMENT SYSTEM - A nickel recovery loss reduction method that makes it possible to reduce nickel recovery loss by lowering the concentration of fine floating solid components in overflow liquid in precipitating and separating treatments, and consequently to further reduce a nickel recovery loss, a hydrometallurgical method for nickel oxidized ore to which the nickel recovery loss reduction method is applied, and a sulfurizing treatment system. The present invention is a nickel recovery loss reduction method in a sulfurizing step for blowing hydrogen sulfide gas into a nickel containing sulfuric acid aqueous solution to generate nickel-containing sulfides and a barren liquid, and the nickel-containing sulfides with the average particle size adjusted to a predetermined size or larger are added as seed crystals to the sulfuric acid aqueous solution. It is more preferable to adjust the average particle size of the nickel sulfides to be added as seed crystals to 55 μm or more. | 06-19-2014 |
20150023849 | DEZINCIFICATION PLANT, METHOD FOR OPERATING DEZINCIFICATION PLANT, AND HYDROMETALLURGICAL METHOD FOR NICKEL OXIDE ORE - The present invention provides a hydrometallurgical method for nickel oxide ore, wherein the plant can be smoothly started up without imposing a load onto a filter cloth for a separation treatment of zinc sulfide, and the amount of residual zinc in a mother liquor for nickel recovery can be reduced to 1 mg/L. In the plant start-up after the completion of a periodic inspection, a post-neutralization solution is controlled to return to a neutralization reaction tank via circulation piping by adjustment of a switching valve in flow piping without sulfurizing post-neutralization solution. When the flow rate and/or the temperature of the post-neutralization solution circulated reaches a predetermined value, a sulfurization treatment is applied to the post-neutralization solution in the dezincification reaction tank to form zinc-sulfide-containing mother liquor for nickel recovery and adjust the switching valve. Zinc-sulfide-containing mother liquor for nickel recovery is transferred to a filter apparatus via transfer piping. | 01-22-2015 |
20150023850 | NEUTRALIZATION METHOD AND NEUTRALIZATION PLANT - A method for improving the filterability in separating a zinc sulfide, produced by applying sulfurization treatment to a post-neutralization solution containing zinc together with nickel and cobalt in a dezincification step in a hydrometallurgical process for nickel oxide ore. The method includes a neutralization reaction step of neutralizing leachate in a neutralization tank, a separation step of separating neutralized slurry into a neutralized sediment and a post-neutralization solution by adding flocculant to the neutralized slurry, a measuring step of measuring the viscosity of the post-neutralization solution, a step of storing the post-neutralization solution in a storage tank, and a transfer step of transferring the stored post-neutralization solution to a dezincification reaction tank used in a dezincification step subsequent to a neutralization step. | 01-22-2015 |
20150044112 | METHOD FOR OPERATING FLASH VESSEL - The present invention is such that, with H1 being the height from a slurry outlet to a control liquid level, H2 being the height from the control liquid level to the top of a flash vessel, and being the diameter of the flash vessel, 0.35D≦H1≦0.45D, and 0.75D≦H2≦0.85D, and at least one liquid level sensor detects a slurry liquid surface at a control liquid level; when the liquid level sensor detects a slurry liquid surface which has risen, a slurry discharge valve installed on a slurry discharge pipe derived from the flash vessel is opened; and when the liquid level sensor detects a slurry liquid surface which has fallen, the slurry discharge valve is closed, whereby opening and closing of the valve is appropriately controlled thereby to reduce troubles with a steam discharge pipe, the slurry discharge pipe, and the slurry discharge valve. | 02-12-2015 |
20150044126 | HYDROGEN SULFIDE GAS PRODUCTION PLANT AND METHOD FOR RECOVERING AND USING WASTE HYDROGEN SULFIDE GAS - An object is to provide a hydrogen sulfide gas production plant that can recover discharged waste hydrogen sulfide gas and efficiently supply the gas to a process plant where processing is conducted by using hydrogen sulfide gas, and also provide a method for recovering and using the waste hydrogen sulfide gas by the hydrogen sulfide gas production plant. In the present invention, the hydrogen sulfide gas production plant is provided with a pipe that recovers the waste hydrogen sulfide gas discharged from the hydrogen sulfide gas production plant and that has one end connected to the process plant where the hydrogen sulfide gas is used, and the discharged waste hydrogen sulfide gas is recovered and the recovered waste hydrogen sulfide gas is supplied to the process plant through the pipe. | 02-12-2015 |
20150086450 | METHOD FOR ADDING STARTING MATERIAL SLURRY AND SULFURIC ACID TO AUTOCLAVE IN HIGH PRESSURE ACID LEACHING PROCESS AND AUTOCLAVE - In an autoclave in a high pressure acid leaching process in which starting material slurry and sulfuric acid are stirred by stirring machines in each compartment in the autoclave partitioned by partition walls to proceed leaching, and slurry is transferred from a compartment on an upstream side to a compartment on a downstream side to sequentially proceed leaching, wherein starting material slurry supply tubes having the starting material slurry discharge ports and sulfuric acid supply tubes having sulfuric acid discharge ports are alternately disposed on a perimeter of stirring blades of the stirring machine provided in the compartment at an upstream end, and the starting material slurry and sulfuric acid are added to the compartment at the upstream end from the starting material slurry discharge ports and the sulfuric acid discharge ports positioned higher than an uppermost part of the stirring blades and lower than a contained liquid surface. | 03-26-2015 |
20150145183 | FLASH VESSEL AND METHOD FOR OPERATING SAME - A hydrostatic tower whose lower part communicates with a liquid phase space within a flash vessel, and whose upper part communicates with a gas phase space within the flash vessel is provided. A rising liquid level within the hydrostatic tower is detected by at least one maximum liquid level sensor provided at a position at the same level as a predetermined maximum liquid level within the liquid phase space. A dropping liquid level within the hydrostatic tower is detected by at least one minimum liquid level sensor provided at a position at the same level as a predetermined minimum liquid level within the liquid phase space. | 05-28-2015 |
20150152521 | AUTOCLAVE APPARATUS USED DURING HIGH-PRESSURE ACID LEACHING PROCESS - In an autoclave apparatus for a high-pressure acid leaching process which advances leaching by stirring heated and pressurized material slurry and sulfuric acid by stirrers in compartments in an autoclave main body of a plurality of compartments, transfers slurry from an upstream side compartment to a downstream one to advance leaching, liquid flow ports for slurry transfer that open and close by doors are provided on the partition walls, the liquid flow ports for slurry transfer are installed at positions where the heights from the lowermost portion the autoclave to the center of gravity are 0.1 to 0.3 times an autoclave diameter and distances from the center lines of the partition walls to the center of gravity are 0.05 to 0.25 times the autoclave diameter, and the liquid flow ports for slurry transfer have shapes which do not reach end portions of the partition walls. | 06-04-2015 |
20150175420 | HYDROGEN SULFIDE GAS PRODUCTION PLANT SYSTEM AND METHOD FOR RECOVERING AND USING HYDROGEN SULFIDE GAS - The present invention allows low-concentration hydrogen sulfide gas to be recovered and supplied to a processing plant that uses hydrogen sulfide gas. The hydrogen sulfide gas production plant is provided with a first supply pipe that supplies hydrogen sulfide gas obtained from a sulfur recovery facility to a processing plant, and a second supply pipe that is branched at a predetermined point in the first supply pipe and supplies the hydrogen sulfide gas from the sulfur recovery facility to the processing plant. The first supply pipe has a concentration meter that is provided on the upstream side than the branch point and measures the concentration of the hydrogen sulfide gas. The first supply pipe and the second supply pipe have ON/OFF valves that are provided on the downstream side of the branch point and perform ON/OFF control of the supply to the processing plant through the supply pipe. | 06-25-2015 |
20150299007 | NEUTRALIZATION TREATMENT METHOD AND NEUTRALIZING AGENT - Provided is a neutralization treatment method capable of performing an efficient neutralization treatment with the reduction of the amount of a neutralizing agent to be used such as slaked lime in a neutralization treatment that is performed in order to discharge a process liquid generated in a metal smelting or hydrometallurgy process to the outside of the system. The neutralization treatment is performed for a liquid discharged in a metal smelting or hydrometallurgy process by using as a neutralizing agent boiler ash that is obtained after combustion of a fluidized-bed boiler and is obtained by burning of a sulfur content derived from coal being a fuel while adding lime stone to the sulfur content and desulfurizing the sulfur content. | 10-22-2015 |
20150315046 | HEAVY-METAL REMOVAL METHOD AND HEAVY-METAL REMOVAL DEVICE - Provided are a heavy-metal removal method and a heavy-metal removal device, which are capable of reducing the amount of a neutralizing agent to be used. In a neutralization tank provided with a vertical-type cylindrical reaction vessel | 11-05-2015 |
20150329379 | PROCESSING DEVICE AND PROCESSING METHOD FOR HYDROGEN-SULPHIDE-CONTAINING BARREN SOLUTION - Provided are a treatment method for a barren solution, and a treatment device for a barren solution, with which hydrogen sulfide can be efficiently removed from the barren solution. In an aeration tank provided with a vertical-type cylindrical reaction vessel, stirring blades arranged in the reaction vessel, and an annular aeration tube having a large number of air outlets, which is arranged to a bottom part of the reaction vessel, aeration is performed by blowing gas for aeration into the reaction vessel from a large number of air outlets of the aeration tube while stirring a liquid by rotation of the stirring blades. | 11-19-2015 |
20150338027 | SLURRY-TRANSPORTING FACILITY AND SLURRY TRANSPORTATION CONTROL METHOD - A slurry-transporting facility equipped with a plurality of pump-equipment circuits, whereby a stop of slurry supply to a transport destination at the time of switchover between the pump-equipment circuits for use is prevented to make an efficient operation possible. The slurry-transporting facility includes: pipe arrangements which branch out from a feed tank into the plurality of circuits; a transport pump provided in each of the pipe arrangement; a first valve provided upstream from the transport pump; a second valve provided downstream from the transport pump; and a uniting pipe arrangement formed by joining of the pipe arrangements at a predetermined position and connected to a LT heater. The uniting pipe arrangement is provided with a third valve configured to control the transportation of ore slurry to the LT heater and a pressure gauge configured to measure a pressure in the uniting pipe arrangement. | 11-26-2015 |
20150352475 | OPERATION METHOD FOR DEZINCIFICATION PLANT - The present invention makes it possible that, at the time of start-up of a dezincification plant used in a dezincification step in a hydrometallurgical method for nickel, a decrease in the throughput in the dezincification plant is controlled to prevent a decrease in production volume, and moreover, an excellent cake layer is formed on a filter cloth provided to a filter device inside the dezincification plant, whereby efficient filtration is performed. When, upon start-up of the dezincification plant, a slurry containing a formed zinc sulfide is supplied to a filter for filtration and separation, an adjustment is performed in such a manner that the flow rate of the slurry is increased in stages to reach a target flow rate in a time T | 12-10-2015 |
20160002038 | PLANT FOR MANUFACTURING HYDROGEN SULFIDE GAS AND METHOD FOR EXHAUSTING HYDROGEN SULFIDE GAS - An object of the present invention is to reduce costs while maintaining safety in exhausting hydrogen sulfide gas. In exhaust facilities of a plant for manufacturing hydrogen sulfide gas, the concentrations of hydrogen sulfide gas leaking from a reaction facility, a cooling facility, and a sulfur removal facility, respectively, are measured by a measuring apparatus, and when a detected concentration is less than a predetermined concentration, a valve is controlled to exhaust hydrogen sulfide gas from a first exhaust pipe into the air, on the contrary, when a detected concentration is not less than a predetermined concentration, the valve is controlled to exhaust hydrogen sulfide gas from a second exhaust pipe to a gas treatment facility. | 01-07-2016 |
20160024614 | HYDROMETALLURGICAL PLANT FOR NICKEL OXIDE ORE AND METHOD FOR OPERATING THE HYDROMETALLURGICAL PLANT - A hydrometallurgical plant according to the invention includes: a leaching facility provided with leaching treatment tanks in a plurality of lines to perform a leaching treatment; a preliminary neutralization facility provided with neutralization treatment tanks in two stages to perform pH adjustment of leach slurry; and solid-liquid separation facility made up of a single line to perform solid-liquid separation of leach slurry which is pH-adjusted and discharged from the preliminary neutralization facility, in which the preliminary neutralization facility is provided with neutralization treatment tanks of a first stage in a plurality of lines so as to correspond to the respective leaching treatment tanks, and is configured such that leach slurries which are pH-adjusted in the neutralization treatment tanks of the first stage are merged in a neutralization treatment tank | 01-28-2016 |