5 results about "FERROUS CARBONATE" patented technology

The invention discloses a preparation method of ferrous L-threonate, and relates to the technical field of organic chemical synthesizing.The preparation method comprises the steps that vitamin C serves as a raw material and is oxidized through hydrogen peroxide to obtain threonic acid, residual hydrogen peroxide is removed through high temperature, and the threonic acid reacts with ferrous carbonate under the nitrogen protection condition to generate the ferrous L-threonate; and filtering and concentrating under reduced pressure to obtain a ferrous L-threonate crude product, and recrystallizing and purifying the crude product to obtain a ferrous L-threonate pure product. The process has the advantages of good process stability, high purity of pure products, cheap and easily available raw materials, simplicity in operation, high safety, environmental friendliness and the like.

This application relates to the field of hydrometallurgical technology and discloses a method for treating red mud. The method includes: treating red mud with sulfuric acid solution to remove sodium, obtaining sodium sulfate washing solution and sodium-removed slag; performing a first-stage leaching treatment on the sodium-removed slag to obtain a first-stage leachate and a first-stage leaching residue; performing a second-stage leaching treatment on the first-stage leaching residue to obtain a second-stage leachate and a second-stage leaching residue, wherein the second-stage leaching residue includes iron-calcium slag; introducing sulfur dioxide into the first-stage leachate for reduction treatment to obtain a reduced solution; reacting the reduced solution with ferrous carbonate for titanium precipitation treatment to obtain a titanium-precipitated solution and titanium slag; reacting ammonia water with the titanium-precipitated solution for aluminum precipitation treatment to obtain an aluminum-precipitated solution and aluminum hydroxide slag; and introducing oxygen into the aluminum-precipitated solution for iron precipitation treatment to obtain hematite slag and an iron-precipitated solution. This method achieves efficient recovery of resources from red mud.

The application provides a preparation method and application of Prussian blue and activated carbon-Prussian blue material. The preparation method of the Prussian blue comprises the following steps: adding a reducing agent to an aqueous solution containing ferricyanide complex for reduction treatment, so that the ferricyanide complex is reduced into ferrocyanide, and a ferrocyanide solution containing ferrocyanide and other reducing substances is obtained; adding a first iron salt solution to the ferrocyanide solution for de-reduction treatment, so that the other reducing substances contained in the ferrocyanide solution are removed, and a ferrocyanide ferrous carbonate precipitate and a post-precipitation liquid containing ferrocyanide are obtained through solid-liquid separation; and adding a second iron salt solution to the post-precipitation liquid for post-treatment, so that the ferrocyanide reacts with iron ions to obtain a Prussian blue slurry. The preparation method provided in the examples of the application can reduce the impurity content of the Prussian blue, improve the purity of the Prussian blue, and is beneficial to the preparation of activated carbon-Prussian blue material with better energy absorption performance.

The invention relates to the field of liquid foliar fertilizer preparation. The invention relates to a preparation method of a special efficient iron-supplementing stress-resistant liquid foliar fertilizer for flowers, which comprises the following steps of: preparing ferrous carbonate by double decomposition reaction: adding ferrous sulfate and ammonium bicarbonate into deionized water at 20-28 DEG C, and reacting under a stirring condition to obtain a ferrous carbonate turbid liquid with the pH value of 6.2-6.8; adjusting the pH value of the ferrous carbonate turbid liquid to 4-6 by using an acetic acid or sodium acetate buffer solution, then adding disodium ethylene diamine tetraacetate into the ferrous carbonate turbid liquid, heating to 40-45 DEG C, and forming an EDTA-Fe < 2 + > chelating solution under a stirring condition; cooling the EDTA-Fe < 2 + > chelating liquid to room temperature, sequentially adding polyglutamic acid, sodium lignin sulfonate and boric acid, and uniformly stirring to obtain the efficient iron-supplementing stress-resistant liquid foliar fertilizer special for flowers. According to the invention, the contradiction that the traditional fertilizer can not promote the flower when supplementing iron and can not resist stress when promoting the flower is solved.

This invention discloses a method for preparing an autotrophic denitrification packing material, specifically: 0.3–1.2 parts by weight of dolomite powder, 90–95 parts by weight of modified sulfur powder, 0.5–1.5 parts by weight of iron powder, 1–2 parts by weight of ferrous carbonate powder, 0.5–2 parts by weight of sodium bicarbonate, 0.5–1.5 parts by weight of kaolin, 0.5–1.2 parts by weight of straw powder, and 0.5–1 parts by weight of sodium hexametaphosphate are placed in a disc granulator and mixed evenly. A liquid bio-enhancing agent is then sprayed into the disc granulator. Upon contact with the liquid, the solid powder in the disc granulator gradually forms spherical particles under the tilting and stirring action of the granulator. This invention also discloses the application of the autotrophic denitrification packing material prepared by the above method in the treatment of wastewater from an electronics industrial park.