Sumitomo Metal Mining Company, Ltd.

Mitsubishi Heavy Industries Limited

Sumitomo Wiring Systems, Limited

Mitsubishi Power, Ltd.

Hiroyuki Mitsui

Osamu Nakai

Satoshi Matsubara

Tatsuya Higaki

Keisuke Shibayama

Hideki Sasaki

Yasumasa Kan

Hiroshi Kobayashi

Yoshitomo Ozaki

Hirofumi Shoji

Yoji Kyoda

Manabu Enomoto

Taiji Torigoe

Shigeki Senoo

Masahiko Mega

Soichiro Tabata

Shuji Tanigawa

Yoshifumi Okajima

Keiji Kudo

Tomoaki Yoneyama

Ikumasa Koshiro

Yoshiyuki Inoue

Kiyoshi Tatsuhara

Shinichiro Nakamura

Hirofumi Shouji

Daisuke Kudo

Kunio Asai

Norihisa Toki

Tetsuya Sawatsubashi

Atsushi Idegami

Hirotaka Kawasaki

Sho Shirai

Takayuki Ikarashi

Masayuki Oku

Ryuichi Matsubara

Tetsuji Kawakami

Naoto Tagami

Moritarou Asatori

Nariyuki Tomonaga

Hikaru Miyata

Kenji Tachi

Yasuo Yoshii

Shibayama,keisuke

A steam turbine according to the present invention comprises: a shaft which rotates about the rotation axis thereof; a plurality of moving blades which extend in the radial direction from the outer peripheral surface of the shaft and which are arranged along the circumferential direction; a casing main body which covers the shaft and the moving blades from the outer peripheral side; a plurality of stationary blades which are arranged on the inner circumferential surface of the casing main body; and a substance supply unit which supplies, to the surfaces of the moving blades and/or the surfaces of the stationary blades, a film forming substance that is hydrophobic, wherein the substance supply unit has a storage unit, a supply passage which is formed inside the casing and through which the film forming substance flows, and discharge units which are formed inside the moving blades and/or the stationary blades and which guide the film forming substance to the surfaces.

Steam turbine, blade, and method for improving performance and reliability of steam turbine

A method of cleaning a blade of a rotary device includes: a first application step of applying a water-soluble cleaning liquid containing a surfactant to the blade; a setting-aside step of setting the blade to which the cleaning liquid has been applied aside; a first wiping step of wiping the blade after the setting-aside step; a second application step of applying water or a dilute cleaning liquid having a lower concentration of the surfactant than that in the cleaning liquid applied in the first application step to the blade after the first wiping step; and a second wiping step of wiping the blade after the second application step.

Method of cleaning blade of rotary device

A corrosion sensor includes an inner electrode formed of a conductive material, the inner electrode including a columnar portion around an axial line as a center thereof and of which an outer circumferential surface is tapered, wherein a diameter of the outer circumferential surface decreases toward one side in an axial direction, an outer electrode formed of a conductive material, the outer electrode including a cylindrical portion around the axial line and of which an inner circumferential surface is tapered, wherein a diameter of the inner circumferential surface decreases toward the one side in the axial direction, and the cylindrical portion is positioned such that the inner circumferential surface radially faces the outer circumferential surface, and an insulation layer formed of an insulation material and in a position across which the outer circumferential surface faces the inner circumferential surface.

Corrosion sensor and production method for the same

A thermal barrier coating film includes a bond coat layer that is a metallic bond layer formed on a base material; a topcoat layer that is a ceramic-containing layer formed on the bond coat layer; and at least one of a protective layer and a protective substance. The protective layer is formed on the topcoat layer and mainly contains SrSO. The protective substance is provided in a plurality of void spaces included in the topcoat layer and mainly contains SrSO.

Thermal barrier coating film, turbine member, and thermal barrier coating method

Provided is a production method for refining iron oxide (hematite), which has such a low sulfur content as to be used as a raw material for ironmaking from a leach residue containing iron oxide, the leach residue being produced by a high pressure acid leach (HPAL) process and being a raw material that can be cheaply and stably procured. In the method of producing (high purity) hematite for ironmaking by a process of adding an oxidant and sulfuric acid to nickel oxide ore and then leaching nickel, a leach residue obtained after the leaching of nickel is heated to 600&#xb0; C. or more, and preferably 800&#xb0; C. or more and 1400&#xb0; C. or less.

Production method for hematite for iron production

The present invention provides a chromium-containing water treatment method that allows treatment of water that contains chromium (chromium-containing water) at low cost. A chromium-containing water treatment method according to the present invention comprises: a reduction step in which chromium-containing waterand a liquidcontaining 5-50 ppm of hydrogen sulfide are mixed, and the mixture is adjusted to pH 3.5 or lower and ORP 200-400 mV by adding an acidthereto, so as to reduce chromium contained in the water; and a precipitation separation step in which a neutralizing agent is added to a solutionobtained via the reduction step so as to adjust the solutionto pH 8-9, thereby precipitating and separating, as a hydroxide, the reduced chromium contained in the solution.

Chromium-containing water treatment method

Provided is a method for manufacturing a nickel and cobalt mixed sulfide that is capable of stabilizing nickel and cobalt concentrations in the sulfidation end solution at low levels and of limiting decreases in nickel and cobalt recovery rates without increasing cost even when processing with a sulfuric acid acidic solution containing nickel and cobalt and a high iron ions concentration as the sulfidation start solution. This method generates a sulfidation reaction by blowing hydrogen sulfide gas into a sulfuric acid acidic solution comprising nickel and cobalt to obtain a mixed sulfide, wherein: the sulfuric acid acidic solution, which is the sulfidation start solution, contains iron ions at a rate of 1.0-4.0 g/L; and the sulfidation reaction is generated by blowing hydrogen sulfide gas into the sulfidation start solution and adding sodium hydrogensulfide (NaHS) obtained by absorbing hydrogen sulfide gas-containing exhaust gas, generated by the sulfidation, in an alkaline solution.

Method for manufacturing nickel and cobalt mixed sulfide and nickel oxide ore hydrometallurgical method

Provided is a method for producing nickel sulfide from an acidic sulfuric acid solution containing nickel, which is capable of suppressing particle diameters of nickel sulfide obtained thereby. The present invention is a method for producing nickel sulfide by causing a sulfurization reaction by blowing a hydrogen sulfide gas into an acidic sulfuric acid solution containing nickel, wherein: nickel sulfide having particle diameters of 5-20 &#x3bc;m and serving as seed crystals is added into an acidic sulfuric acid solution having a nickel concentration of 0.5-5.0 g/L in an amount of 40-500% by mass relative to the amount of nickel contained in the acidic sulfuric acid solution; and a hydrogen sulfide gas is blown into the acidic sulfuric acid solution, into which the seed crystals have been added, while setting the amount of the hydrogen sulfide gas blown in to be within the range of 0.30-0.85 Nm/kg-Ni.

Method for producing nickel sulfide 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.

Dezincification plant, method for operating dezincification plant, and hydrometallurgical method for nickel oxide ore

A method of producing (high-purity) hematite for ironmaking includes adding an oxidant and sulfuric acid to nickel oxide ore and then leaching nickel. The method further includes forming a neutralized residue having a sulfur grade exceeding 1.0% by weight by adding a neutralizing agent to leach slurry and being subjected to solid-liquid separation. The neutralizing agent functions to form plaster by reaction with a free sulfuric acid of surplus acid contained in the leach slurry. The leach slurry is a mixture of a leachate and a leach residue obtained after leaching the nickel. The method then includes heating the neutralized residue at a heating temperature of 600&#xb0; C. or more and 1400&#xb0; C. or less to form hematite having a sulfur grade of 1.0% or less by weight.

Method for producing hematite for ironmaking

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.

Method for a treatment for wastewater containing aluminum, magnesium, and manganese

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.

Neutralization method and neutralization plant

At the beginning of a dezincification plant used in a dezincification step in a hydrometallurgical method for nickel, a decrease throughout the dezincification plant is controlled to prevent a decrease in production volume and a cake layer is formed on a filter cloth provided to a filter device inside the dezincification plant. At the beginning of dezincification plant, a slurry containing a formed zinc sulfide is supplied to a filter for filtration and separation, an adjustment is performed in which the flow rate of the slurry is increased to reach a target flow rate in a time Twhich satisfies the following relational expression 3&#xd7;T&#x2266;T&#x2266;5&#xd7;T, where Trepresents the time between starting a slurry supply and attaining the target flow rate in the case of transferring the slurry at the maximum liquid transfer capacity of a pump configured to transfer the slurry.

Operation method for dezincification plant

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.

Slurry-transporting facility and slurry transportation control method

This method for determining whether an acidic aqueous solution is usable or not comprises: a first detection step (S) in which the solution concentration of an acidic aqueous solution resulting from pickling is determined; a second detection step (S, S) in which the concentration of a specific metal in the acidic aqueous solution resulting from pickling is determined, the metal having been contained in the coating layer; a concentrated-solution addition step (S) in which in cases when the solution concentration is equal to or less than a predetermined first threshold, a concentrated acidic aqueous solution is newly added; and a determination step (S, S) in which in cases when the concentration of the specific metal is equal to or higher than a predetermined second threshold, it is determined that the acidic aqueous solution is unusable.

Method for determining whether acidic aqueous solution is usable

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Tokyo, Japan

Hiroyuki Mitsui