Abstract: The invention provides metal-silica polymeric flocculants having high coagulation performance which are used for water treatment, particularly to remove suspended materials and other impurities from irrigation water, waste water or the like. A silica sol having a SiO2 concentration of from 100 to 200 g/L and a viscosity of less than 6 cp is prepared by colliding an inorganic acid aqueous solution with a silicate aqueous solution at each rate of 5 m/sec or more. The silica sol is aged to make an aged silica sol having a viscosity of 6 to 30 cp, and the aged silica sol is mixed with a water-soluble metal salt such as ferric chloride, to prepare the flocculants.

Abstract: An apparatus for preparing a flocculant for water treatment, comprising: (a) a storage tank for an inorganic acid aqueous solution, (b) a storage tank for a silicate aqueous solution, (c) a storage tank for a metal salt aqueous solution, (d) a collision device for preparing a silica sol by colliding the inorganic acid aqueous solution stored in the inorganic acid aqueous solution storage tank with the silicate aqueous solution stored in the silicate aqueous solution storage tank at each rate of 5 m/sec or more, (e) a stirring and aging device for aging the silica sol obtained by the collision with stirring and (f) a feeding device for feeding the metal salt aqueous solution stored in the metal salt aqueous solution storage tank in order to mix the metal salt aqueous solution with the silica sol drawn from the stirring and aging device.

Abstract: When manufacturing a straight steel section having a joint 2 comprising a ball claw 21 and a curved claw 20 by hot-rolling a bloom vertically symmetrically to make a section blank having a flange 2A at a web 1 end (first step), vertically asymmetrically hot-rolling the section blank to adjust the size of the web and form the flange into a rough joint 2B including a projection 20A (second step), and subjecting the projection to hot bend rolling into a curved claw 20 (third step), wherein the bloom has a chemical composition comprising, in mass percentage, from 0.01 to 0.20% C, up to 0.8% Si, up to 1.8% Mn, up to 0.030% P, and up to 0.020% S; and therein the claw bending start temperature in the third step is a temperature of over Ar3 or up to Ar3-50° C., thereby achieving a depth of wrinkle flaws 10 present on the inner surface side of the curved claw of up to 0.5 mm.

Abstract: The invention intends to provide metal-silica polymeric flocculants having high coagulation performance which are used for water treatment, particularly used to remove suspended materials and other impurities from irrigation water, waste water or the like, and can be stably prepared at low cost industrially.

Abstract: When manufacturing a straight steel section having a joint 2 comprising a ball claw 21 and a curved claw 20 by hot-rolling a bloom vertically symmetrically to make a section blank having a flange 2A at a web 1 end (first step), vertically asymmetrically hot-rolling the section blank to adjust the size of the web and form the flange into a rough joint 2B including a projection 20A (second step), and subjecting the projection to hot bend rolling into a curved claw 20 (third step), wherein the bloom has a chemical composition comprising, in mass percentage, from 0.01 to 0.20% C, up to 0.8% Si, up to 1.8% Mn, up to 0.030% P, and up to 0.020% S; and therein the claw bending start temperature in the third step is a temperature of over Ar3 or up to Ar3—50° C., thereby achieving a depth of wrinkle flaws 10 present on the inner surface side of the curved claw of up to 0.5 mm.

Abstract: Apparatus is provided for producing an output signal upon sensing the proximity of a source of magnetic field. The apparatus includes a magnetoresistive element which is comprised of an insulating substrate upon which first and second ferromagnetic strips are provided. The ferromagnetic strips define first and second main current conducting paths which are respectively perpendicular to each other. The strips are connected in series to define a junction therebetween from which an output signal is derived. Current supply terminals are provided for furnishing an energizing current to the magnetoresistive element. Impedances are connected in parallel with the series-connected strips to thereby form a bridge circuit with the ferromagnetic strips, the junction between the strips serving as a bridge output terminal. A generator magnet has a surface disposed in a plane spaced from the magnetoresistive element and produces a magnetic field which is sensed by the element.

Abstract: Apparatus is provided for producing an output signal upon sensing the proximity of a member having relatively high magnetic permeability. The apparatus includes a magnetoresistive element which is comprised of an insulating substrate upon which first and second ferromagnetic strips are provided. The ferromagnetic strips define first and second main current conducting paths which are respectively perpendicular to each other. The strips are connected in series to define a junction therebetween from which an output signal is derived. Current supply terminals are provided for furnishing an energizing current to the magnetoresistive element, which energizing current flows in a direction from one to the other of the current supply terminals. A bias magnetic field is provided in a direction perpendicular to one of the main current conducting paths and which is sensed by the element.