Sumitomo Metal Mining Co.

Tokyo, Japan

Sumitomo Metal Mining Co.

Tokyo, Japan
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To provide a copper powder exhibiting a high electric conductivity suitable for a metallic filler used in an electrically conductive paste, a resin for electromagnetic shielding, an antistatic coating, etc., and having excellent uniform dispersibility required for forming a paste so as to inhibit an increase in viscosity due to flocculation. This copper powder 1 forms a branch shape having a plurality of branches through the conglomeration of copper particles 2. The copper particles 2 have a spheroidal shape, with diameters ranging from 0.2 m-0.5 m, inclusive, and lengths ranging from 0.5 m-2.0 m, inclusive. The average particle diameter (D50) of the copper powder 1 in which the spheroidal copper particles 2 have conglomerated is 5.0 m-20 m. By mixing this tree-branch-shaped copper powder 1 into a resin, it is possible to produce an electrically conductive paste, etc., exhibiting excellent electric conductivity, for example.


Patent
Sumitomo Metal Mining Co. | Date: 2017-01-04

Provided is a method for producing hematite from a leach residue containing fine iron oxide produced in an HPAL process, firstly the method allowing the use of Ca-based neutralizing agents and neutralizing agents, other than Ca-based neutralizing agents, which are derived from a base rock, in real operation of refining hematite to obtain hematite containing a low level of sulfur component to such an extent that the hematite can be used as a raw material for ironmaking, and secondly the method allowing the sintering of very fine powder ore which has not conventionally been used. The method for producing (high purity) hematite for ironmaking, by a process where a mineral acid and an oxidizing agent are added to an ore containing iron and a valuable metal and then the valuable metal is leached under high temperatures and high pressures, includes the steps of: (1) a high pressure leach step; (2) a preliminary neutralization step; (3) a first solid-liquid separation step; (4) a first neutralization step; (5) a second neutralization step; (6) a third solid-liquid separation step; (7) seed crystal addition treatment; (8) a second solid-liquid separation step; and (9) a baking step.


Patent
Kochi University and Sumitomo Metal Mining Co. | Date: 2017-02-01

Provided is nickel powder obtained by adding seed crystals to a nickel ammine complex solution and performing hydrogen reduction reaction under high temperatures and high pressures, wherein the nickel powder does not produce dust during handling, and a container can be efficiently filled with the nickel powder. The method for producing nickel powder includes: adding seed crystals and a surfactant having a nonionic or anionic functional group to a solution containing a nickel ammine complex to forma mixed slurry; and subjecting the mixed slurry to hydrogen reduction under high temperature and high pressure conditions in a pressure vessel to obtain nickel powder from the mixed slurry.


Patent
SUMITOMO METAL MINING COMPANY Ltd | Date: 2017-01-04

Proposed is a process for separating a leach residue from which a hematite-containing material that can be used as a raw material for ironmaking can be obtained, and provided is a production process of hematite for ironmaking from the leach residue. The process for producing hematite for ironmaking using, as a raw material, the leach residue in a slurry state obtained from a hydrometallurgical plant for nickel oxide ore utilizing a high pressure acid leach process comprises in sequence: a first step of separating the leach residue in a slurry state into an overflow and an underflow using a wet cyclone; a second step of separating the overflow into a strong magnetic component and a weak magnetic component using a strong-magnetic-field magnetic separator utilizing magnetic force; and a third step of sintering the separated strong magnetic component at a temperature of 1150 to 1350C to form a sintered body.


Provided is a positive electrode active material that can be used to fabricate a nonaqueous electrolyte secondary battery having excellent output characteristics not only in an environment at normal temperature but also in all temperature environments from extremely low to high temperatures. A positive electrode active material for nonaqueous electrolyte secondary batteries, the positive electrode active material includes a boron compound and lithium-nickel-cobalt-manganese composite oxide of general formula (1) having a layered hexagonal crystal structure. The lithium-nickel-cobalt-manganese composite oxide includes secondary particles composed of agglomerated primary particles. The boron compound is present on at least part of the surface of the primary particles, and contains lithium.Li_(1+s)Ni_(x)Co_(y)Mn_(z)Mo_(t)M_(w)O_(2) ...(1)


Patent
Sumitomo Metal Mining Co. | Date: 2017-02-08

To provide an ore slurry manufacturing facility and an ore slurry manufacturing method capable of manufacturing ore slurry having a high solid constituent ratio and a high specific gravity while maintaining a slurry treatment amount. An ore slurry manufacturing facility A comprises: a first thickener 1 for obtaining intermediate ore slurry by preliminarily concentrating raw ore slurry; and a second thickener 2 for obtaining concentrated ore slurry by concentrating the intermediate ore slurry. The second thickener 2 has higher thickening effect than the first thickener 1. The intermediate ore slurry resulting from the preliminary concentration by the first thickener 1 is supplied to the second thickener 2. This increases settling speed of the ore slurry at the second thickener 2, so that a slurry treatment amount can be increased. The second thickener 2 having high thickening effect is arranged at the latter stage, so that concentrated ore slurry having a high solid constituent ratio and a high specific gravity can be manufactured.


Patent
Sumitomo Metal Mining Co. | Date: 2017-09-27

Provided is a smelting method capable of effectively promoting a reduction reaction on pellets formed using nickel oxide ore as starting material to obtain a ferronickel alloy with a high nickel grade of at least 4%. The present invention is a method for smelting nickel oxide ore wherein ferronickel alloy with a nickel grade of at least 4% is obtained by reduction-heating of pellets formed from nickel oxide ore, the method comprising a pellet-producing step S1 for producing pellets from nickel oxide ore, and a reducing step S2 for reduction-heating of the obtained pellets in a smelting furnace. In the pellet-producing step S1, the pellets are produced by mixing nickel oxide ore with a specified amount of a carbonaceous reducing agent as starting materials. In the reducing step S2, the produced pellets are charged in a smelting furnace in which a carbonaceous reducing agent (furnace bottom carbonaceous reducing agent) has been spread over the entire furnace bottom and reduction-heating is performed.


Patent
Sumitomo Metal Mining Co. | Date: 2017-09-27

A cone valve of the present invention enables to extend a lifespan more than a conventional cone valve even if it is used as a check valve when feeding slurry containing highly abrasive coarse particles. A cone valve (1) used as a check valve when feeding slurry, comprising at least a valve body (11), a valve seat (13), and a spring (14) incorporated to make the valve body (11) contact the valve seat (14), wherein an entire length of the spring (14) is at least shorter than a stroke length of the valve body (11).


[Object] To provide an Au-Ag-Sn-based solder alloy for high temperature use that is so good at reflow wettability as to be sufficiently usable in reflow bonding of crystal quartz devices, SAW filters and MEMS, wherein, in particular, the solder alloy costs low and is excellent in solderability, reflow wettability and reliability. [Measures for Solution] An Au-Sn-Ag-based solder alloy containing Sn, Ag, Au and elements that are inevitably contained owing to manufacture procedure, characterized by having a composition adjusted so that a solidus temperature is within a range of 280-400C with a gap between the solidus temperature and the liquidus temperature being within 40C.


Patent
Sumitomo Metal Mining Co. | Date: 2017-09-20

To provide a countercurrent direct-heating heat exchanger achieving high heat exchange efficiency. A countercurrent direct-heating heat exchanger A exchanges heat by flowing a heating target fluid 1 and a heating medium 2 in opposite directions and making the heating target fluid 1 and the heating medium 2 contact each other directly. The countercurrent direct-heating heat exchanger A includes: a container 10; and one or a plurality of tilted plates 20 provided in the container 10 and each having a downstream edge portion 21 from which the heating target fluid 1 drops down. The downstream edge portion 21 of one, some, or all of the tilted plates 20 are each provided with a plurality of teeth 22. The heating target fluid 1 dropping down from the downstream edge portions 21 is cut with the teeth 22 to form strip-shaped gaps. As a result, an area of contact between the heating target fluid 1 and the heating medium 2 is increased to increase heat exchange efficiency.

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