5 results about "Pyritic sulfur" patented technology

This invention discloses a process for recovering germanium from germanium-silicon alloy waste, belonging to the field of germanium recovery technology. The process includes the following steps: S1. Oxidizing and roasting the germanium-silicon alloy waste to obtain roasted clinker; S2. Sulfidating and fixing the roasted clinker and pyrite to obtain activated clinker; S3. Leaching the activated clinker with sulfuric acid, followed by solid-liquid separation, and collecting the germanium-containing leachate; S4. Performing multi-stage countercurrent extraction on the germanium-containing leachate using an amine extractant to obtain a loaded organic phase; then back-extracting the loaded organic phase with an alkaline back-extraction solution to obtain a germanate solution; S5. Hydrolyzing and precipitating the germanate solution to obtain pure germanium dioxide. The roasting process of this invention fixes impurities and activates elemental germanium into soluble germanium dioxide. The purification stage efficiently separates germanium from other impurity ions, and the final hydrolysis precipitation controls product consistency. This invention's recovery process has high recovery efficiency and purity, is more environmentally friendly, and is expected to achieve large-scale production.

This invention patent application addresses a system for the detection and quantification of mineralogical species via x-ray diffraction (XRD) of the concentrate of dry copper before it is injected into a converter or melting furnace. Specifically, it addresses a device that performs a mineralogical analysis, in line and in real time, of the concentrate of copper in the bath smelting furnace via x-ray diffraction (XRD), which allows for control over the ideal mixture for the optimal process for copper sulfide (Cu2S)-white metal, iron sulfide (FeS)-Slag and pyritic sulfur (S2)-temperature.

This invention discloses a special semi-coke for ferrosilicon smelting, its preparation method, and its application. The preparation method includes coal crushing, acid washing and ash removal, low-temperature dry distillation, briquetting, and medium-temperature dry distillation. This invention utilizes acid washing to dissolve and heat the coal, causing some of the pyrite sulfur to react and generate colloidal sulfur. Combined with medium-temperature dry distillation in a reducing atmosphere, the colloidal sulfur and residual FeS2 are converted into H2S and volatilized. Volatile organic sulfur is removed at low temperatures, achieving deep desulfurization of the coal. Simultaneously, the acid washing process effectively reduces the ash content of the semi-coke. Low-temperature dry distillation is used for pre-separation of the gas, solid, and three phases, and the sulfur enrichment effect of the gas and liquid phases further improves the desulfurization effect. Through a synergistic process of acid washing and ash removal, two-stage temperature-controlled dry distillation, enhanced desulfurization in a reducing atmosphere, and tar bonding and molding, this invention solves the industry problems of high sulfur content, high ash content, and low strength, providing a highly efficient and low-cost special reducing agent for ferrosilicon smelting.

The invention discloses special semi-coke for silicomanganese smelting as well as a preparation method and application thereof. The preparation method comprises the steps of furnace coal crushing, acid pickling and ash removal, low-temperature dry distillation, ball pressing and forming and medium-temperature dry distillation. Part of pyrite sulfur reacts to generate colloidal sulfur through acid pickling dissolution and heating reaction, the colloidal sulfur and residual FeS2 are converted into H2S to be volatilized in cooperation with medium-temperature dry distillation in a reducing atmosphere, volatile organic sulfur is removed at a low-temperature section, and the deep desulfurization effect of furnace coal is achieved; meanwhile, the ash content of semi-coke is effectively reduced in the pickling process; gas-solid three-phase separation is performed in advance by utilizing low-temperature dry distillation, and the desulfurization effect is further improved by utilizing the sulfur enrichment effect of a gas phase and a liquid phase; the industrial problems of high sulfur, high ash content and low strength are solved through a synergistic process of acid pickling ash removal, two-stage temperature control dry distillation, reducing atmosphere reinforced desulfurization and tar bonding forming, and an efficient and low-cost special reducing agent is provided for silicomanganese smelting.

The application discloses a composite functional material for sewage denitrification treatment and a preparation method and application thereof. Raw materials of the composite functional material include pyrite, sulfur, sucrose and auxiliary components, wherein the mass ratio of the pyrite, the sulfur, the sucrose and the auxiliary components is 3-5:0.7-1.1:0.25-0.45:0.06-0.22. The composite functional material can efficiently remove nitrate in water bodies and is suitable for sewage treatment of different types.