7 results about "Iron(III) oxide-hydroxide" patented technology

Provided are: a novel complex capable of efficiently adsorbing and collecting arsenic (V) dissolved in water; and a novel arsenic adsorbent. This complex contains iron (III)-containing particles supported on microfibrous cellulose. At least a portion of the iron (III)-containing particles has an aspect ratio of 2 or more. The iron (III)-containing particles preferably contain at least one iron compound selected from iron oxides, iron hydroxides, and iron oxyhydroxides. This arsenic adsorbent contains the complex.

In the present invention, a reducing agent containing at least one substance selected from the group consisting of iron metal and iron oxides is added to an oxide containing at least one valuable element selected from the group consisting of Ni, Co, and Mn and impurity elements constituted of copper and iron, thereby obtaining an oxide mixture. The oxide mixture is heated to reduce the oxide to thereby obtain a metal. The present invention obtains a leachate containing a valuable element and an impurity element by bringing the metal into contact with an acid solution. A sulfurizing agent is added to the leachate so as to cause copper to precipitate as copper sulfide, thereby obtaining a copper removal solution. An oxidizing agent is added to the copper removal solution so as to cause iron to precipitate as iron hydroxide, thereby obtaining a valuable element solution containing a valuable element. The valuable element solution, a complexing agent, and an alkaline aqueous solution are introduced into a reaction tank liquid to obtain a precipitate containing the valuable element.

The application discloses a preparation method of a coal-saving agent for denitration type cement firing and application thereof. The method comprises the following steps: (1) mixing aluminum powder, iron hydroxide powder, iron powder, magnesium powder, silica sol and polymer emulsion, stirring uniformly, drying and grinding to obtain a precursor powder; (2) placing the precursor powder in saturated limewater and reacting under heating conditions, separating out solid matters after completion, drying the solid matters, mixing the dried solid matters with phosphating liquid, standing and drying to obtain a denitration heat-aiding agent; and (3) taking a penetrating agent, a bulking agent, iron citrate and the denitration heat-aiding agent as an A component, and taking hydrogen peroxide as a B component. The A component and the B component are mixed uniformly before use to obtain the coal-saving agent. The coal-saving agent can promote the combustion of coal powder, improve the utilization rate, help to reduce the emission of polluting gases such as sulfur oxides and nitrogen oxides, and relieve the high energy consumption and high pollution problems faced by cement production enterprises.

A method for producing an iron-clad graphite composition, which involves plating graphite powder with iron, wherein the plating is carried out chemically, by the action of NaOH on a mixture of FeCl2 aqueous solution and graphite powder at 35-500C, by heating the resulting iron (II) hydroxide-clad graphite at 170-1800C to convert it into iron (II) oxide and then hydrogenating it at 180-2500C to obtain free iron-clad graphite.

EXCERPT The present invention relates to a process for the manufacture of iron hydroxide and / or iron oxide pellets, comprising the drying of iron sludge and the pelletizing of the dried iron sludge to obtain iron hydroxide and / or iron oxide pellets, whereby a binder is added to the dried iron sludge prior to pelletizing.

The present invention involves obtaining a mixed oxide by adding, in an addition amount of 1.5 equivalents or less, a reducing agent including at least one selected from the group consisting of metallic iron and iron oxide, to an oxide including valuable elements that are Mn and at least one selected from the group consisting of Ni and Co and impurity elements that are copper and iron. A metal is obtained by heating the mixed oxide to reduce the oxide. A leachate containing the valuable elements and the impurity elements is obtained by bringing the metal into contact with an acid solution. A copper-depleted solution is obtained by adding a sulfurizing agent to the leachate to precipitate copper as copper sulfide. A valuable-element solution containing the valuable elements is obtained by adding an oxidizing agent to the copper-depleted solution to precipitate iron as iron hydroxide. A precipitate including the valuable elements is obtained by introducing the valuable-element solution, a complexing agent, and an alkaline aqueous solution into a liquid in a reaction chamber.

A method of preparing an amorphous iron sulfide carrier for removing nitrogen from water, which effectively removes nitrogen from wastewater containing nitrate nitrogen or nitrite nitrogen, includes the stabilizing step for an hydrogen sulfide saturated-iron hydroxide material by immersing the material in water for a certain period of time, a step (S10) of preparing iron hydroxide for hydrogen sulfide adsorption having pores and a surface capable of adsorbing hydrogen sulfide; a step (S20) of introducing hydrogen sulfide into the prepared iron hydroxide to reach the iron hydroxide and produce amorphous iron sulfide; and a step (S30) of stabilizing the amorphous iron sulfide produced by reacting with hydrogen sulfide, by immersing in water for one or more days.