Sodium Sulfide CAS 1313-82-2 Sodium Sulphide
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- Appearance: White powder
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Sodium Sulfide: The Complete Guide
Sodium Sulfide for Sale
Basic Info of Sodium Sulfide
Basic Info
Chemical Name: | Sodium Sulfide |
Other Name: | Sodium sulphide; Natrium sulfide; Sodium sulfide anhydrous |
CAS: | 1313-82-2 |
EINECS: | 215-212-0 |
Type: | Inorganic salt; Auxiliary; Organic raw materials |
Molecular Formula: | Na2S |
Molecular Weight: | 78.04 |
Chemical Properties
Melting point | 950 °C(lit.) |
density | 1.86 g/mL at 25 °C(lit.) |
storage temp. | Refrigerator (+4°C) |
solubility | H2O: 0.1 g/mL, clear, colorless |
form | flakes |
color | Yellow |
Specific Gravity | 1.856 |
Water Solubility | 186 g/L (20 ºC) |
Sensitive | Hygroscopic |
Merck | 14,8681 |
Stability: | Spontaneously flammable. Incompatible with acids, metals, oxidizing agents. Contact with acid liberates toxic gas. Fine dust/air mixtures are explosive. Hygroscopic. |
Other Info
Brand Name: | Zhishang Chemical |
Provide: | Sodium Sulfide MSDS; Sodium Sulfide COA |
What is Sodium Sulfide?
Sodium sulfide is also referred to as alkali sulfide, stinky soda, as well as smelly alkali. The pure item is colorless or slightly purple prismatic crystal at area temperature. Industrial salt sulfide is usually pink, brown-red, and also khaki blocks due to pollutants. It has a rotten egg scent, is harsh, dangerous, and has a thickness of 2.427. Decays at 920 ° C. It is soluble in cold water and quickly soluble in hot water. When dissolved in water, it is almost completely hydrolyzed right into sodium hydroxide and sodium hydrosulfide (solubility at 10 ° C is 15.4 g, as well as solubility at 90 ° C is 57.2 g). The aqueous service is strongly alkaline. Destructive to copper, timber, skin, etc. Slightly soluble in ethanol, insoluble in ether.
Salt sulfide reacts with solid acid to release hydrogen sulfide. Deliquescence in the air, quickly oxidized to develop sodium thiosulfate. Sodium sulfide is generally made use of as rawhide depilatory representative, pulp food preparation agent, resources of sulfur dyes, dye intermediate decreasing agent, material coloring mordant, ore flotation protection agent, also can be made use of as desulfurization agent for viscose fiber as well as the production of salt hydrosulfide and also polysulfide. Sodium sulfide resources, etc.
Sodium sulfide in china from the 1830s. It was first generated by a chemical plant in Dalian, Liaoning Province on a little scale. From the 1980s to the mid-1990s, with the strenuous growth of the worldwide chemical market, the residential sodium sulfide sector undertook a basic modification. Suppliers as well as scale raised dramatically and developed swiftly. The sodium sulfide manufacturing location centered on Yuncheng, Shanxi has actually rapidly increased to more than 10 districts, cities as well as regions consisting of Yunnan, Xinjiang, Inner Mongolia, Gansu, Qinghai, Ningxia, and also Shaanxi. The nationwide annual production ability rose from 420,000 loads in the late 1980s to 640,000 tons in the mid-1990s. The fastest expanding result is in Inner Mongolia, Gansu, and also Xinjiang in northwest China. The manufacturing capacity of Inner Mongolia has actually reached 200,000 bunches, making it the largest sodium sulfide manufacturing base in China.
Sodium Sulfide Uses
Sodium sulfide is a basic chemical raw material, widely used in textiles, dyes, pigments, printing and dyeing, leather, papermaking, mineral processing, rubber, medicine, pesticide industries and the manufacture of polyphenylene sulfide plastics used in the aerospace field.
- In the color industry, it is utilized to generate sulfur dyes, as well as it is the raw material of sulfur cyan and sulfur blue.
- In the printing and dyeing sector, it is used as a color accessory for liquifying sulfur dyes.
- In the tanning sector, it is used for hydrolysis to peel off raw hides, as well as it is likewise used to formulate salt polysulfide to speed up the saturating of dry hides and assist soften them.
- The paper market is made use of as a cooking agent for paper.
- The fabric sector is made use of as a mordant for the denitration of manufactured fibers and the reduction of nitrates, along with the dyeing of cotton textiles.
- The pharmaceutical sector is made use of to create antipyretics such as phenacetin. On top of that, it is additionally made use of to make salt thiosulfate, salt hydrosulfide, sodium polysulfide, etc.
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Application of Sodium Sulfide
Application of sodium sulfide in metallurgy
- Removal of impurities from rare earth leaching solution When dealing with weathering crust leaching rare earth ore, after leaching and leaching with a strong electrolyte solution, the obtained rare earth leaching solution often contains a large amount of impurity ions, such as Al3+, Fe3+, Ca2+, Mg2+, Cu2+, etc. When using the oxalic acid precipitation process, these impurities will inevitably form oxalate precipitation and transfer to rare earth products, affecting the product purity. Moreover, in order to avoid emulsification in the subsequent extraction process, the impurity ions in the feed liquid must be removed first. The solubility product constants of several metal sulfide precipitations are shown in the attached table. When Na2S is added to the rare earth leaching solution, the heavy metal ions Cu2+, Pb2+, Zn2+, etc. in the solution can be effectively removed. The research shows that when the pH is controlled at about 5, adding Na2S to the rare earth leaching solution to remove impurities not only has a good effect of removing impurities, but also does not lose rare earth.
- Treatment of mercury-containing wastewater Mercury-containing wastewater is extremely harmful to the environment and human health. In the alkali-making industry, the mercury content in the discharged wastewater is generally high, exceeding the international level (0.05mg/L). In the weakly reducing (pH8～11) solution, mercury ions can form insoluble precipitates with sodium sulfide. It can be seen from the attached table that the solubility product of HgS is very small (Ksp=1.6×10-52). Through research, it is determined that the treatment effect is best when the amount of Na2S is constant and the pH value is controlled at 9-10, which can reduce the Hg2+ in the wastewater to below the national standard (0.05mg/L). In addition, Fe(OH)2 and Fe(OH)3 colloids are formed in water by adding FeSO4. These colloids can not only adsorb mercury ions, but also capture and coat suspended HgS solid particles, which play a good role in coagulation and precipitation. . Sediment is not easy to secondary pollution, easy to handle.
- Using Na2S to remove arsenic Arsenic generally exists in minerals in the form of sulfide. In the process of pyrometallurgy, most of the arsenic volatilizes into the flue gas and soot, especially the direct emission of low-concentration SO2 will pollute the environment. Therefore, the dearsenic treatment should be carried out before the subsequent treatment or evacuation of the flue gas. Using Na2S solution to absorb SO2 flue gas, As3+ and S2- form As2S3 precipitation (Ksp=2.1×10-22). At higher pH (pH>8), As2S3 can dissolve to form As3S3-6 or AsS2-3, which is relatively At low pH, the solution will generate H2S gas. The research of Yin Aijun et al. [4] shows that when the pH of the solution is controlled in the range of 2.0 to 5.5, the reaction time is 50 minutes, the reaction temperature is 30 to 50 °C, and the flocculant is added, the arsenic can be removed well, and the arsenic removal rate can reach 90%. %above. In the production of medicinal white carbon black, in order to reduce the content of impurity arsenic in the raw material concentrated sulfuric acid, sodium sulfide is added to the concentrated sulfuric acid to make As3+ generate As2S3 to precipitate and remove. Production practice shows that sodium sulfide removal of arsenic not only reacts quickly, but also removes arsenic thoroughly. The arsenic content in the sulfuric acid after arsenic removal is below 0.5×10-6, and the arsenic content of the white carbon black produced with this raw material is ≤0.0003%, which fully complies with the US Pharmacopoeia.
Application of Na2S in electroplating
Na2S is used as a brightener in electroplating: sodium sulfide is dissolved in water and then ionized into positively charged sodium ions (Na+) and negatively charged sulfide ions (S2-). During the electroplating process, the presence of S2- in the electrolyte can To promote cathode polarization, under the same current, make the cathode reaction speed up. The deposition rate is also accelerated, the deep plating capacity is increased, the coating layer is refined, and the surface of the plated part becomes brighter accordingly.Sodium sulfide removes impurities in the electrolyte: During the electroplating production process, more or less impurities in the raw materials will be brought into the plating solution. These impurities react differently under the action of the electrode, and the impurities with lower potential will be deposited on the surface of the plated part together with Zn2+, which will affect the quality of the coating. After adding sodium sulfide, S2- in sodium sulfide can form precipitates with metal impurity ions, so as to prevent impurities from participating in the electrochemical reaction and make the coating bright.
- Using Na2S solution for flue gas desulfurization At present, the recovery method of SO2 in flue gas is mainly to convert SO2 into H2SO4, liquid SO2 and elemental sulfur. Because elemental sulphur is easy to handle and transport, it is also an ideal recycling product. A new process for preparing elemental sulfur by reducing SO2 by using H2S prepared from Na2S solution as reducing agent. This process is simple and does not need to consume expensive reducing agents such as natural gas and low-sulfur coal as in the general production technology.
Application of sodium sulfide in mineral processing
Sodium sulfide as inhibitor
The inhibitory effect of sodium sulfide on sulfide minerals is generally considered to be mainly in two aspects. One is that Na2S is hydrolyzed to generate HS-, and HS- excludes the xanthate adsorbed on the surface of sulfide minerals, and at the same time, it is adsorbed on the surface of minerals to increase the hydrophilicity of the surface of minerals. On the one hand, it is believed that the inhibitory effect of Na2S is not only caused by the adsorption of HS- on the mineral surface, but also related to the S2- generated by the ionization of Na2S in aqueous solution.Since the solubility product of PbS is large, while the solubility product of PbX2 is small, when Na2S is added, the concentration of S2- increases and the equilibrium shifts to the left, which makes the xanthate attached to the mineral surface desorbed, so that Na2S inhibits the mineral surface. effect. Using the inhibitory effect of Na2S, adding Na2S to inhibit the flotation of Ni2S3, the effective separation of Cu2S and Ni2S3 in high nickel matte can be achieved. In some lead and zinc concentrators, due to equipment problems and unreasonable production processes, the slag after flotation still contains high lead and zinc. However, due to the adsorption of certain flotation reagents on its surface, the long-term stacking will cause serious mudding, which makes the re-sorting of lead and zinc ore extremely difficult. Using the inhibitory effect of Na2S, Na2S can be used as a de-agent to desorb the xanthate that has been adsorbed on the mineral surface, so that the subsequent flotation operation is easy to carry out. The lead-zinc medium ore stockpiled in Shaanxi Xinhe Concentrator is pretreated with sodium sulfide for drug removal, and then the flotation process is carried out to obtain lead concentrate with lead content of 63.23% and zinc concentrate with zinc content of 55.89% (lead and zinc). The recovery rates of zinc can reach 60.56% and 85.55%, respectively), making full use of secondary mineral resources. In the sorting of copper-zinc sulfide ores, due to the dense intergrowth of minerals, high sulfur content and secondary copper, the sorting is difficult. The sphalerite has been activated by Cu2+ during the grinding process, and its floatability It is close to chalcopyrite, so it is not easy to separate copper and zinc minerals. When processing this kind of ore, by adding Na2S during grinding, the S2- generated by the hydrolysis of Na2S and some heavy metal ions with activation ability, such as Cu2+, form insoluble sulfide precipitation, and the activation of these heavy metal ions is eliminated. Then, by adding inhibitors of zinc and sulfur, using butyl ammonium black medicine to preferentially select copper-copper tailings zinc-zinc tailings sulfur selection process, copper concentrates containing 25.10% copper and zinc concentrates containing 41.20% zinc are obtained. ore and sulphur concentrate with 38.96% sulphur content.
- Sodium sulfide as activator
Flotation studies on the smithsonite-limonite system show that in limonite amine flotation, only at lower pH, the amine can be adsorbed on the mineral surface by electrostatic force. However, after adding Na2S, FeS film is formed on the surface of limonite. Since FeS film can increase the adsorption of molecular amines at higher pH, FeS reagent particles can be used for flotation of limonite at high pH. Amine flotation was performed. In addition, Na2S can be used as a flotation activator for copper oxide minerals. When an appropriate amount of Na2S is added to the flotation solution, the dissociated S2- will undergo a displacement reaction with the surface lattice anions of the oxide minerals, so that a sulfide film is formed on the surface of the copper oxide minerals, which is beneficial to the adsorption of xanthate collectors. However, the copper sulfide film formed on the surface of the copper oxide ore is not very firm, and it is easy to fall off when the stirring is strong. When dealing with the Touzui Copper Mine (Malachite-based copper-bearing minerals) in Daye, Hubei, the flotation method of adding Na2S in multiple stages and extracting the concentrate at multiple points reduces the circulation of the medium ore, and the grade ratio of the copper concentrate is higher. The production process was increased by 2.1%, and the recovery rates of copper and gold were increased by 25.98% and 10.81% respectively. Na2S can also be used as a flotation activator for pyrite inhibited by high soda lime in high soda lime systems. In the high alkali system, the surface of pyrite is covered with a hydrophilic calcium film (Ca(OH)2, CaSO4), which inhibits the flotation. Studies have shown that after adding Na2S, the hydrolyzed HS- ions can displace Ca(OH)2, CaSO4 and Fe(OH)3 covering the surface of pyrite on the one hand, and at the same time they can be adsorbed on the surface of pyrite. . Due to the ability of pyrite to transfer electrons, when the interface potential of pyrite is greater than EHS/S0, HS- loses electrons on the surface of xanthate and generates hydrophobic elemental sulfur. The resulting elemental sulfur encapsulates the mineral surface, thereby activating it and facilitating flotation. - Sodium sulfide as an induced flotation agent for gold and silver minerals
Since the collector-free flotation of gold ore makes full use of the electrochemical principle and the electronic difference between the surface of sulfide and gold and silver minerals, the collector-free flotation has higher selectivity and simpler chemical system. In addition, it eliminates the uncontrollable non-selective adsorption in the flotation of xanthate collectors, and solves the problem of drug removal before cyanide leaching and the problem of collector film blocking gold leaching. There are many studies on the flotation of gold and silver minerals without supplementary agents. Gold and sulfide minerals in gold and silver ore often coexist, especially gold and pyrite are closely related. Because the surface of pyrite has semiconducting properties and certain electron transport ability, and comparing the surface electrostatic potential of pyrite with that of HS-/S0 for EHS-/S0, when the pH of the slurry is in the range of 8 to 13, the pyrite The electrostatic potential of mine surface is always higher than EHS-/S0. Therefore, both HS- and S2- ionized by Na2S in the slurry will discharge on the surface of pyrite to generate elemental sulfur.
Reference
- Sodium sulfide – WikiPedia
- Sodium sulfide – PubChem
- CN201810763300.3 A kind of preparation technology of high-purity sodium sulfide
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