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.

Method for treating drainage containing arsenic and other heavy metals

Abstract: PROBLEM TO BE SOLVED: To remove drainage containing arsenic and other heavy metals economically and efficiently by a method in which a sulfurizing agent of a specific pH value is added into drainage containing arsenic and other heavy metals, iron (III) ions are added with sulfide deposits left in the water, and the produced precipitates are separated. SOLUTION: Dilute drainage in which the concentration of each component of arsenic and other heavy metals is, for example, 100 mg/liter or below is added alkali, if the drainage is acidic, in order to adjust its pH at 7 or above, added with a sulfurizing agent, and stirred. Hydrogen sulfide, sodium sulfide, sodium hydrogen sulfide, and others can be used as the sulfurizing agent, and sodium hydrogen sulfide (NaHS) is used preferably. The amount of the agent to be added is controlled to be twice or below the necessary equivalent to sulfurize the components in liquid. After that, the liquid is added with iron (III) ions with the sulfide deposits left in the liquid. In this way, the produced precipitates are removed from the liquid, and the purification of the drainage is finished.

Pollution-free flotation separation method for copper-lead-zinc polymetallic ore

Abstract: The invention discloses a pollution-free flotation separation method for copper-lead-zinc polymetallic ore. The method comprises the steps that crushed raw ore and water are firstly ground according to the ratio of 1:1 till the fineness of materials discharged out of a ball grinding mill is -0.074 mm and reaches 90%-95%, inhibitors, such as lime, sodium sulfide, zinc sulfate and sodium sulfite and a sodium butyl xanthogenate as a collecting agent are added for copper-lead bulk flotation, copper-lead roughing concentrates are ground to be -0.045mm and reach 90%-95%, the inhibitor of zinc sulfate and sodium sulfite and the collecting agent Z-200 are added at low alkalinity to inhibit lead and float copper to achieve copper-lead asynchronous separation, and copper concentrates are obtained through one time of rougher flotation and two times of concentration; after copper-lead separation roughing tailings are subjected to one-time scavenging, lead flotation is carried out, during lead flotation work, lime is added to intensify zinc and sulfur inhibition, sodium butyl xanthogenate serves as the collecting agent, and lead concentrates are obtained through one time of rougher flotation, two times of scavenging and two times of concentration; and lead scavenging tailings return to copper-lead bulk rougher flotation work, and other middlings cyclically return to the last work. The method has the beneficial effects of being environment-friendly, free of pollution, low in production cost and good in separation effect, and copper-lead-zinc efficient separating and comprehensive recycling are achieved.

Studies on the thermal properties of poly(phenylene sulfide amide)

Abstract: Thermal properties of poly(phenylene sulfide amide) (PPSA) prepared using sodium sulfide, sulfur, and thiourea as sulfur sources which reacted with dichlorobenzamide (DCBA) and alkali in polar organic solvent at the atmospheric pressure, were studied. The glass transition temperature (T g ), melting point temperature (T m ), and melting enthalpy (ΔH m ) of the related polymers were obtained by use of differential scanning calorimetry analysis. The results are: T g = 103.4-104.5°C, T,,, = 291.5-304.7°C, and ΔH m = 104.4-115.4 J/g. Thermal properties such as thermal decomposition temperature and decomposition kinetics were investigated by thermogravimetric analysis under nitrogen. The initial and maximum rate temperatures of degradation were found to be 401.5-411.7°C and 437-477°C, respectively. The parameters of thermal decomposition kinetics of PPSAs were worked out to be: activation energy of degradation was 135 to 148 kJ/mol and the 60-s half-life temperature was 360 to 371°C.

Beneficiation method for copper oxide cobalt ores

Abstract: The invention relates to a beneficiation method for copper oxide cobalt ores. The beneficiation method is characterized by comprising the following steps of 1, ore grinding, i.e. crushing and grinding raw ores; 2, copper oxide flotation, i.e. adding sodium sulfide, a collecting agent butyl xanthate and a foaming agent terpenic oil in the primary roughing process, adding sodium sulfide, butyl xanthate and terpenic oil in the primary scavenging process, adding sodium sulfide, butyl xanthate and terpenic oil in the secondary scavenging process and carrying out secondary blank concentration to obtain copper oxide concentrates and flotation tailings; and 3, magnetic separation, i.e. carrying out primary roughing magnetic separation on the flotation tailings to obtain cobalt rough concentrates and magnetic separation tailings and carrying out secondary concentration magnetic separation on the cobalt rough concentrates to obtain cobalt concentrates and magnetic separation tailings. The invention provides the beneficiation method for the copper oxide cobalt ores, which reduces cost and pollution. The method disclosed by the invention is suitable for the copper oxide cobalt ores comprising copper oxide ores, copper oxide cobalt ores and cobaltous oxide minerals.