|Place of Origin:||Hunan|
|Model Number:||smbs-I 7|
|Minimum Order Quantity:||1 metric ton|
|Price:||usd 300 per metric ton|
|Packaging Details:||25 kgs bag,1000 kgs big bag|
|Delivery Time:||5-8 days|
|Payment Terms:||T/T , L/C|
|Supply Ability:||3000 tons per month|
|Name:||Coagulant In Rubber Industry Sodium Metabisulfite||Other Name:||Coagulant In Rubber Industry Sodium Pyrosulfite|
|Shelf Life:||365 Days, One Year||Usage:||Chemical For Rubber Industry|
|Packing:||Plastic Woven Bag||Mocular:||Na2S2O5|
sodium metabisulfite oxygen scavenger,
sodium metabisulphite antioxidant
Sodium Metabisulfite Industrial Grade
Sodium Metabisulfite for Mining Industry
Sodium metabisulfite is one of a group of preservatives known as sulfites. It is a food preservative, cosmetic and industrial bleaching agent, and an ingredient in the developing solution for film and photography. Evidence exists that it is also an immune-system toxin. As part of the group of sulfites, sodium metabisulfite can provoke reactions in people, particularly asthmatics, ranging from gastrointestinal discomfort and hives to asthma attacks.
Sodium metabisulfite is used as a preservative in foods such as baked goods, jams, wines, dried fruit and many sauces. Sulfites can be added before or after cooking. Fruits and raw vegetables used to be sprayed with sulfites, but this practice was banned by the U.S. Food and Drug Administration in 1986. Sodium metabisulfite is also used as an antibacterial agent in wine, although some manufacturers have begun using potassium metabisulfite instead. Some winemakers have claimed that sodium metabisulfite increases the sodium content of wine.
Sodium metabisulfite exists in both food-grade and non-food-grade forms. The non-food-grade form is an industrial bleaching and reducing agent; it is also used to remove excess chlorine from drinking water and as a photographic developing and fixing bath agent.
Sodium metabisulfite is an antioxidant additive in injectable medicines and is also used as a reducing agent in pharmaceuticals. Some medical lotions may contain sodium metabisulfite; even in topical preparations, however, sodium metabisulfite may induce allergic or sensitive reactions.
Reactions to sodium metabisulfite are more common among asthmatics than in the general population and can be mild or severe. According to the World Health Organization’s International Programme on Chemical Safety, 25 percent of severe reactions to sulfites involved breathing difficulties, although reactions affected not only respiratory function but skin and gastrointestinal function as well. Hives, swelling and vomiting are all possible reactions.
Ingesting foods containing sodium metabisulfite can set off reactions if you are sensitive to sulfites. Regulations require manufacturers to list sulfites on ingredient labels. The Cosmetics Database notes that sodium metabisulfite, used in products such as moisturizers, sunscreens, cleansers and hair bleaches, may be toxic to the human immune system and may be a carcinogen.
Sodium metabisufite solubility
Solubility of sodium metabisufite: dissolve in water, water solution is acidic (54g/100ml water at 20℃, 81.7g/100ml water at 100℃). Soluble in glycerol, slightly soluble in ethanol. Relative density 1.4. Soluble in water and soluble in glycerol, easy decomposition with moisture. Exposed to air, easily oxidized into sodium sulfate. Contacting with strong acids, release sulfur dioxide and generates the corresponding salts. Heating up to 150℃ decompose.
Application of Sodium Metabisulfite Industrial Grade
Sodium Metabisulfite Industrial Grade has a wide uses range. In pharmaceutical industry Sodium Metabisulfite is used for purification in chloroform, benzene propyl sulfone and benzaldehyde production; Sodium Metabisulfite is used for coagulant in rubber industry; Sodium Metabisulfite is used for antichlor in cotton bleaching, Cotton mill auxiliary and mordant in printing and dyeing industry; Sodium Metabisulfite is used for leather processing in tanning industry, Sodium Metabisulfite can make leather soft, plump and tough, and make leather own waterproof, anti folding, wear resistance properties; Sodium Metabisulfite can be used for the production of Hydroxyvanilline and Hydroxylamine Hydrochloride in chemical industry; Sodium Metabisulfite can be used as developer in photographic industry.
Sodium Metabisulfite Industrial Grade Specification
|Purity (AS Na2S2O5 )||96.5% Min||97.4%|
|Sulfur Dioxide (SO2)||65.0% Min||65.5%|
|Iron (Fe)||0.005% Max||0.002%|
|Water Insoluble||0.05% Max||0.03%|
Introduction to Sodium Metabisulfite in application of metal mineral processing
Sodium Metabisulfite is widely used for mining industry. Methods of mineral processing are as follows:
Gravity | Magnetic separation | Electric selection | Flotation | chemical selction | Photoelectric election | Friction selection | Hand picking
Flotation: Flotation is the technique of separating useful minerals from the ore, based on the physical and chemical properties of mineral particles. Almost all of the ore can be used in flotation separation.
Flotation reagents commonly used in flotation: collector, foaming agent, modifier. Among them, the modifier also includes the inhibitor, activator, pH adjusting agent, dispersing agent, flocculant, etc..
Catching agent: Catching agent is flotation reagents that changes hydrophobicity of mineral surface, makes planktonic mineral particle adhere to bubble. Xanthate, black powder is anionic collector.
Flotation of lead and zinc ores:
Galena (i.e. PBS) is a relatively common mineral, it is a kind of sulfide. Xanthate and black powder are commonly used as catching agent (potassium dichromate is an effective inhibitor).
Sphalerite (ZnS) chemical composition is sulfide minerals such as ZnS, Crystals.
The catching capacity of short chain alkyl xanthate on sphalerite is weak or not available. ZnS or Marmatite without activation can be selected only by long chain type xanthate.
In the next period of time, the applications of xanthate catching agents will continue to occupy the dominant position. In order to adapt to the demand of increasingly complex Sphalerite flotation, the combination of pharmacy is imperative, it is also an effective way to fully tap the potential of traditional medicine.
The main flotation inhibitor are as follows:
1. Lime (CaO) has strong water absorption, acted with water to produce hydrated lime Ca(OH)2. Lime is used to improve pH of the pulp, inhibit of iron sulfide minerals. In the sulfide copper, lead, zinc ore, often associated with sulfided iron ore.
2. Cyanide (KCN, NaCN) is an effective inhibitor for the separation of lead and zinc. In alkaline pulp, CN concentration increases, which is in favor of inhibition.
3. The sterling of Zinc Sulfate is white crystal, soluble in water, is the inhibitor of sphalerite, usually in the alkaline pulp it has effect of inhibition.
4. The key that plays inhibition roles in sulfite, sulfite, SO2 is mainly HSO3－. Sulfur dioxide and sub sulfuric acid (salt) are mainly used in inhibition of Pyrite and sphalerite. Weak acid mine pulp made of lime from Sulfur dioxide (pH=5～7), or use Sulfur dioxide, zinc sulfate, ferrous sulfate and ferric sulfate together as inhibitor. Thus galena, pyrite, sphalerite are inhibited. The inhibited sphalerite can be activated by small amount of copper sulfate. Also can use Sodium thiosulfate, sodium metabisulfite to replace sulfite, to inhibit sphalerite and iron pyrites (commonly known as FeS2).
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