International name: Sulfur Ground

Synonyms: sercol, soffil, thiovite

Chemical formula: S

Appearance: light yellow powder, combustible, easily melting

Manufacturing: Russia

Packaging and storage: 25 kg bag; up to 1 year

 

Description

Sulfur is a chemical element vital to plants. It is a part of all proteins contained in some amino acids. It is a component of complex fertilizers. Ground sulfur is an elementary chemical. It does not dissolve in water. In this case, sulfur is readily soluble in organic substances. When heated, cyclic molecules are formed. The ground sulfur is polymerized.
Nowadays, sulfur is produced in various commodity forms (determined by the customer): lumpy, liquid, formed, granulated, ground, colloid, pure.
In chemical reactions shows non-metallic properties. Dust of ground sulfur is explosive, it forms sulfur dioxide during combustion. Sulfur ground should be used with extreme caution. This is due to the fact that it forms toxic compounds.
Sulfur refers to very common elements. Occurs in nature as a native element and in minerals: iron pyrites (pyrite), zinc blende (wurtzite), gelenite, cinnabar, antimonite. Sulfur is a part of oil, coal, shale and natural gas; proteins of higher organisms

 

Properties

Sulfur under normal conditions - brittle crystals of yellow color. The density is 2.07 g / cm3, the melting point is +112.8 ° C, and the boiling point is +444.6 ° C.
Sulfur is insoluble in water, but it readily dissolves in carbon disulfide and benzene. When these liquids evaporate, rhombic sulfur can be obtained, whose crystals are in the form of octahedra with cut corners or ribs.
There is also a monoclinic modification of sulfur with a melting point of + 119.3 ° C and a density of 1.96 g / cm3. It is stable only at temperatures above +96 ° C. At a lower temperature, it turns into rhombic sulfur. Differences in the properties of crystalline modifications are caused by the unequal structure of the crystals.
Sulfur has the properties of typical non-metals. With many metals, sulfur is able to bind directly. Reactions are accompanied by the release of a large amount of heat. Sulfur reacts with all non-metals, but is much more difficult than with metals

 

Receiving

Granulated sulfur is obtained by various methods.
Water granulation (pelletizing) was developed in 1964 by the British firm Elliot. The process is based on the rapid cooling of drops of sulfur falling into the water. The first introduction of technology - the process of "SALPEL" in 1965. The largest plant was later built in Saudi Arabia in 1986. On it, each of the three plants can produce up to 3,500 tons of granular sulfur per day. The lack of technology - the limited quality of sulfur granules, which have an irregular shape and increased fragility.
Granulation in the fluidized bed is developed by the French company Perlomatik. Drops of liquid sulfur are fed upward. They are cooled by water and air and wetted with liquid sulfur, which solidifies on the resulting granules with a thin layer. The final size of the granules is 4-7 mm. More progressive is the Procor process, which is widely implemented in Canada. It uses drum granulators. However, this process is very difficult to manage.
Air-tower granulation was developed and implemented in Finland in 1962. The sulfur melt is dispersed by means of compressed air in the upper part of the granulation tower. Drops fall and harden, getting on a transport tape.

 

Application

Sulfur ground is used mainly in agriculture as a fungicide (for combating fungal diseases of plants, for seed dressing). It is recognized as an essential component for plant nutrition (one of the main components, along with phosphorus, magnesium, calcium ...), therefore, in varying amounts is part of many fertilizers.
Crushed sulfur is also used as an anti-mite and powdery mildew. The treatment is carried out in the vegetative period, but a maximum of 1 day before harvesting and no more than 5 times per season. Effective when processing vineyards, fruit trees, shrubs (except gooseberry).
It is not applied to vegetable crops, but significantly increases the yield of cereals. The introduction should be repeated every year, since during the transition to sulfates, sulfur ceases to be assimilated by plants and the soil becomes poorer.
In the rubber industry, sulfur ground is used as a vulcanizer in the manufacture of products from butadiene, isoprene and copolymer rubbers with unsaturated chains. Particularly widely used for the production of automobile tires for all types of transport

 

Safety requirements

Sulfur is prone to chemical spontaneous combustion in the presence of moisture, on contact with oxidants, as well as in a mixture with coal, fats, oils. Sulfur forms explosive mixtures with nitrates, chlorates and perchlorates. Self-ignited by contact with bleach. Extinguishing media: sprayed water, air-mechanical foam. Vapors form an explosive mixture with air. Combustion of sulfur takes place only in the molten state, similar to the burning of liquids. The upper layer of burning sulfur boils, creating vapors that form a light-luminous flame up to 5 cm in height. The flame temperature during combustion of sulfur is 1820 ° C. In order to meet fire safety requirements in sulfur warehouses, it is necessary to:

  • The structures and process equipment must be regularly cleaned of dust;
  • In the warehouse room should be constantly ventilated by natural ventilation with open doors;
  • The crushing of sulfur lumps on the bunker grate should be done by wooden sledgehammers or a tool of non-sparking material;
  • Conveyors for the supply of sulfur in production facilities should be equipped with metal detectors; in places of storage and use of sulfur, it is necessary to provide devices (skirts, thresholds with a ramp, etc.), which in an emergency situation prevent the spreading of sulfur melt outside the premises or the site.
  • In the sulfur warehouse it is forbidden:
  • Production of all types of work with the use of open fire;
  • Store and store oiled rags and rags;
  • When repairing, use a tool made of a consumable material.
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