4 results about "Sodium sulfite" patented technology

A method for recovering tin and indium from lead ore refining slag, comprising: adding limestone and crushed coal to lead ore refining slag, uniformly mixing same, then feeding same into a side-blown furnace for smelting under oxygen-enriched air conditions, cooling collected slag, and then adding a sulfuric acid solution and sodium dodecyl sulfate for grinding to obtain slag powder; adding an acid solution to the slag powder for acid leaching, filtering and separating same to obtain a filtrate A and a residue B, drying and pulverizing the residue B, and then smelting and recovering same to obtain crude tin; adding sodium sulfite to the filtrate A for stirring treatment, then adding calcium carbonate to adjust the pH to 4.5-5.5, performing stirring treatment, and then filtering to obtain a filtrate C and a residue D; adding an acid solution to the residue D for secondary acid leaching to obtain a leaching solution, adding zinc powder into the leaching solution for displacement and recovery to obtain crude indium, and at the same time, collecting the post-displacement solution and mixing same with the filtrate C to prepare zinc sulfate. The method can improve the recovery efficiency of tin and indium elements in refining slag, thereby facilitating recovery and utilization of lead ore refining slag.

This invention relates to the field of photocatalytic materials technology, and in particular to a method for molten salt-assisted synthesis of a sulfur-doped carbon-nitrogen supported iron single-atom photocatalyst and its application. The method includes: mixing and separating ferric chloride, hydrochloric acid, and melamine to obtain a solid precursor; subjecting the solid precursor and sodium sulfite to a first-stage heat treatment under a protective atmosphere to obtain a pyrolysis product; mixing the pyrolysis product with molten salt, grinding, and then subjecting it to a second-stage heat treatment under a protective atmosphere to obtain an intermediate; and acid washing and freeze-drying the intermediate to obtain the sulfur-doped carbon-nitrogen supported iron single-atom photocatalyst. This invention utilizes a two-step pyrolysis process and the molten salt template effect to achieve a nanorod-like structure for the photocatalyst, exhibiting both high specific surface area and stable anchorage of iron elements in an atomically dispersed form on the sulfur-doped carbon-nitrogen support. When applied to the photocatalytic water splitting reaction for hydrogen production, it demonstrates excellent catalytic activity, structural stability, and reaction reproducibility.

The application discloses a preparation method of lignin sulfonate and application of the lignin sulfonate in high-temperature dyeing of polyester, and belongs to the technical field of dye dispersants. The preparation method is as follows: SBA-15 after alkali etching is immersed in a precursor solution, and is subjected to aging, drying and calcination treatment; the obtained metal-loaded SBA-15 is immersed in a 3-mercaptopropyltrimethoxysilane toluene solution, and tetraethyl orthosilicate is added to perform a reaction, so as to obtain a silanization modification catalyst; the silanization modification catalyst is oxidized through a peroxymonosulfuric acid aqueous solution, so as to obtain a Mn-Cu@SO3H / SiO2 catalyst; lignin is added into deionized water, polyformaldehyde and the Mn-Cu@SO3H / SiO2 catalyst are added to perform a reaction, and sodium sulfite is added to perform a reaction, so as to obtain the lignin sulfonate. The prepared lignin sulfonate has excellent high-temperature dispersion stability, low fiber staining and high dispersing force characteristics, and can be applied to high-temperature dyeing of polyester fabrics.

The present application relates to the technical field of rare and precious metal refining, and particularly relates to a method for preparing high-purity gold ingot from silver anode slime and high-purity gold ingot, comprising the following steps: crushing and grinding the silver anode slime, mixing the silver anode slime with a chlorine-free composite leaching agent, and filtering to obtain gold-containing leaching residue and impurity-containing leaching solution; washing and drying the gold-containing leaching residue to obtain gold-enriched residue; mixing the gold-enriched residue with a decontamination agent, and filtering to obtain pure gold residue and decontamination waste liquid; mixing the pure gold residue with a reducing liquid, adjusting the pH value to 1.0-2.0, and filtering to obtain sponge gold; washing the sponge gold to neutral, melting and casting ingot at 1100-1200 DEG C, naturally cooling after heat preservation for 20-30 min, and obtaining high-purity gold ingot. The present application realizes efficient separation of most impurities such as silver and copper by using a nitric acid-sulfuric acid composite leaching agent, and then removes residual trace impurities such as palladium and silver by using a hydrochloric acid-sulfuric acid decontamination agent, and finally, the purity of the high-purity gold ingot is greater than or equal to 99.99% by using an oxalic acid-hydrochloric acid reducing system to accurately control the reduction process.