Sodium sulfide

About: Sodium sulfide is a research topic. Over the lifetime, 2851 publications have been published within this topic receiving 27733 citations. The topic is also known as: disodium sulfide.

Floatation method of sulfur-oxygen mixed lead antimony ore

Abstract: The invention relates to a floatation method of sulfur-oxygen mixed lead antimony ore. Sodium carbonate is used as a pH regulator, sodium hexametaphosphate is used as a fine sludge mineral dispersing agent, zinc sulfate and calcium hypochlorite are used as a gangue mineral inhibitor, sodium sulfide, ammonium bicarbonate and lead nitrate are used as a lead antimony ore activator, diethyl dithiocarbamate and butyl xanthate are used as a lead antimony ore collector, and 2# oil is used as a foaming agent, thereby performing floatation on the sulfur-oxygen mixed lead antimony ore to obtain the lead antimony mixed concentrate. The method can effectively recover the sulfur-oxygen mixed lead antimony ore. Under the conditions that the lead grade of the feed ore is 0.28-1.07% and the antimony grade is 0.24-0.83%, the lead antimony mixed concentrate, of which the lead grade is 20.87-34.55% and the antimony grade is 17.53-28.40%, can be obtained. The lead recovery rate is 75.21-82.77%, and the antimony recovery rate is 73.60-80.75%.

Production of arylene thioether copolymer

Abstract: PURPOSE: To obtain the title polymer having a high degree of polymerization and excellent solution stability, etc., by polymerizing a prepolymer derived from a polyarylene thioether with a dihaloaromatic compound in a water- containing polar organic solvent. CONSTITUTION: A polyarylene thioether mainly consisting of repeating units of formula I (wherein R 1 is 1-6C alkyl; and (l) is 0 or 1-4) is depolymerized by treatment with an alkali metal sulfide (e.g. sodium sulfide) in a water- containing polar organic solvent (e.g. water-containing N-methylpyrrolidone) to produce a prepolymer having an alkali thiolate group at least at either terminal thereof. This prepolymer is polymerized with a dihaloaromatic compound (e.g. p-dichlorobenzene) of formula II (wherein R 2 is alkyl, aryl or alkoxy; (j) is 0 or 1-4; and X is halogen) in a water-containing polar organic solvent to obtain an arylene thioether polymer. COPYRIGHT: (C)1992,JPO&Japio

Production of aromatic sulfide/sulfone polymer

Abstract: PURPOSE:To economically obtain the subject new amorphous polymer excellent in heat resistance, flame retardancy, mechanical characteristics, etc., by reacting a dihalodiphenyl sulfone with a sulfidizing agent and then reacting the resultant reaction product with a specific dihalo aromatic compound. CONSTITUTION:(A) A dihalodiphenyl sulfone (preferably a 4,4'-dihaloeno derivative such as 4,4'-dichlorodiphenyl sulfone) in an amount of 0.45-0.53mol based on 1mol sulfur in (B) a sulfidizing agent (preferably sodium sulfide pentahydrate, etc.) is initially reacted with the component (B) in an organic solvent (preferably N-methylpyrrolidone, etc.). The resultant reaction product is then reacted with (C) a dihalo aromatic compound (preferably p-dichlorobenzene, etc.) which is a dihalobenzene or a dihalonaphthalene capable of containing a substituent group to afford the objective polymer having units expressed by the formula (-Ar- is phenylene or naphthalene capable of containing a substituent group; -phi- is p-phenylene).

Improving the Properties of CdS Nanoparticles by Adding Polymers

Abstract: The properties of cadmium sulfide (CdS) nanoparticles generated in the aqueous phase by adding a specially obtained maleic anhydride/styrene copolymer and polymers with different electrical charges—like alginate, chitosan, carrageenan, and polyvinyl pyrrolidone—were improved in order to reduce their toxicity. The cytotoxic effect of CdS semiconductor nanoparticles coated with polymers on cultures of Vero cells was investigated. CdS semiconductor nanoparticles were synthesized and stabilized in aqueous-polymeric system by mixing cadmium nitrate with sodium sulfide into aqueous polymeric solution, with nitrogen gas bubbled throughout the system. The fluorescence properties of nanoparticles depend on the nature of capping polymer. Transmission electronic microscopy gives the information about the size and size distribution of the nanoparticles. The computed size diagrams of CdS nanoparticles have different frequency depending of the used polymer. The nanoparticles coated with polymers presented low toxicity ...

Gold extracting agent and preparation method thereof

Abstract: The invention provides a gold extracting agent and a preparation method thereof, and belongs to the technical field of gold extraction. The gold extracting agent comprises the raw material components in parts by weight: 12-12.4 parts of sodium hexametaphosphate, 7-7.4 parts of sodium cyanate, 9.4-9.8 parts of sodium ferrocyanide, 10.3-10.7 of sodium sulfide, 13.3-13.7 parts of sulphur, 10.4-10.8 parts of sodium bromide, 6.3-6.7 parts of sodium chloride, 8.2-8.6 parts of manganese dioxide, 11.8-12.2 parts of urea, and 9.3-9.7 parts of industrial sodium carbonate. The gold extracting agent is alkaline, and has the advantages of low toxicity, environmental protection, short leaching time and convenient transportation and keeping and the like; in addition, the gold extracting rate is high; and the gold extracting agent is quite suitable for use as a novel gold extracting agent for heap leaching, pond leaching and carbon paste production processes of micro-fine particle gold-containing oxidized ores.