摘要:
A sulfurization facility, where the sulfurizing reaction is conducted in a wet smelting for nickel oxide ore, is improved particularly with the structural modification of its liquid storage vessels so that the consumption of a hydrogen sulfide gas used in a sulfurization step and the consumption of an alkali solution used for processing an exhaust gas can be reduced and the overall cost of operation will thus be minimized. The present invention is directed towards a liquid storage apparatus for use in the sulfurization facility for sulfurizing a sulfate solution to produce a sulfide, the apparatus comprising a plurality of liquid storage vessels (11n) for storing a slurry or a filtrate after solid/liquid separation, a collective conduit (12) for collectively passing an inactive gas to be fed into the liquid storage vessels (11n) or an exhaust gas discharged from the liquid storage vessels (11n), and a pressure control conduit (13) for receiving the flow of the inactive gas and the exhaust gas in order to control the pressure at the inner side of the liquid storage vessels (11n). The pressure control conduit (13) is connected by a junction (30) to the collective conduit (12) and equipped with a pair of pressure control valves (31), (32) mounted at both, front and rear, sides of the junction (30) communicating to the collective conduit (12).
摘要:
A wet smelting plant for nickel oxide ore is provided in which, even when a serious trouble occurs in a processing facility, the preparation period of time of the processing facility required for discontinuing and restarting the operation can be minimized. The wet smelting plant for nickel oxide ore (20) comprises two or more series of the processing facilities, each processing facility including a step operating facility, a utility feed facility (8a), (8b), a hydrogen sulfide feed facility (10a), (10b), a flocculant feed facility (14a), (14b), and a neutralizer feed facility (12a), (12b) and is featured in that connecting installations are further provided for connecting between the utility feed facilities (8a) and (8b), between the hydrogen sulfide feed facilities (10a) and (10b), between the flocculant feed facilities (14a) and (14b), and between the neutralizer feed facilities (12a) and (12b) in order to make the delivery of utility supplies, hydrogen sulfide, flocculant, and neutralizer for mutual substitution.
摘要:
A system for drawing an outer cylinder of a rubber bush comprising an inner cylinder serving as a shaft member, the outer cylinder disposed around the inner cylinder and a rubber elastic body interposed between the inner cylinder and the outer cylinder, comprising first and second turning tables each having at least two piling portions on which the rubber bushes to be drawn are piled up in a vertical direction; first and driving apparatuses for bringing up the rubber bushes piled up on the piling portion of the first and second turning tables to a predetermined robot grasping position; a drawing apparatus having a die for drawing the outer cylinder of the rubber bush; a robot apparatus for grasping and transferring the rubber bush located at the robot grasping position to set the same to a predetermined position of the die; a control apparatus for controlling the robot apparatus such that the rubber bushes from the piling portion of one of the first and second turning tables are sequentially transferred to the die, and if the transfer of all the former rubber bushes from the piling portion was completed, the rubber bushes from the piling portion of the other one of the first and second turning tables and transferred.
摘要:
A concentric rotary valve having a rotatable stem of a valve disc supported by bearing portions and metal seats mounted in a valve housing to contact metal seats on the valve disc. Clearances in directions parallel to a closed disc surface and radial of the valve stem are barely enough to permit a shift of the valve disc to provide a good seat-to-seat contact when the valve is closed, and clearances in directions normal to the closed disc surface and radial of the rotatable stem are barely enough to permit normal rotations of the stem.
摘要:
A method for recovering chromite from ore slurry obtained by processing nickel oxide ore, the raw material, in a plant for the wet smelting of nickel oxide ore. In the method chromite is separated and recovered from an ore slurry obtained from a nickel oxide ore when nickel and cobalt are recovered from the nickel oxide ore. The method has a grain diameter separation step for separating the ore slurry on the basis of a predetermined classification point according to the difference in the grain diameter of particles contained in the supplied ore slurry and a sedimentation separation step for causing the oversized ore slurry separated in the grain diameter separation step to undergo sedimentation and concentration on the basis of a target classification point, and recovering the chromite. The coarse particle content of the oversized ore slurry separated in the grain diameter separation step is adjusted to 30-50%.
摘要:
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.
摘要:
The present invention is directed towards a liquid storage apparatus for use in the sulfurization facility for sulfurizing a sulfate solution to produce a sulfide, the apparatus comprising a plurality of liquid storage vessels for storing a slurry or a filtrate after solid/liquid separation, a collective conduit for collectively passing an inactive gas to be fed into the liquid storage vessels or an exhaust gas discharged from the liquid storage vessels, and a pressure control conduit for receiving the flow of the inactive gas and the exhaust gas in order to control the pressure at the inner side of the liquid storage vessels. The pressure control conduit is connected by a junction to the collective conduit and equipped with a pair of pressure control valves mounted at both, front and rear, sides of the junction communicating to the collective conduit.
摘要:
The wastewater treatment method is to obtain demanganized wastewater, through a step wherein an acid or an alkali is added to sulfuric acid acidified wastewater to adjust pH to not less than 4.0 and not more than 6.0, whereby the sulfuric acid acidified wastewater is separated into a dealuminized solution and an aluminum precipitate; a step wherein a slurrying solution is added to the aluminum precipitate to form a slurry, then an alkali is added to adjust pH to not less than 9.0 and not more than 9.5, whereby an pH-adjusted aluminum precipitate slurry is formed; a step wherein an alkali is added to the dealuminized solution to adjust pH to not less than 8.0 and not more than 9.0; and others.
摘要:
A bolt press fit apparatus comprising; a bolt press fit press machine, a hardware mounting members which can move between a press position of the bolt press fit press machine and a retracted position separated from this press position, and which has a predetermined number of bolt-insertion holes into which bolts are press fitted, bolt transfer mechanisms, and bolt temporarily-press fit mechanisms which insert and temporarily press fit the bolts from the bolt transfer mechanism in a corresponding manner with respect to the predetermined number of bolt-insertion holes.
摘要:
A butterfly valve comprising a valve body mounted on a valve stem in a valve housing. The valve housing is provided with valve seats to contact the periphery of the valve body when the valve is closed. Elastic seal members are disposed between the end surfaces of the valve seats and the valve stem in a manner to surround the latter. The butterfly valve of the invention further comprises tubular holder members rotatable relative to the valve stem and fitted with the elastic seal members on outer parts thereof.