CHEMICAL COMPOSITION OF IRON ORE PELLET || BY SUBHAJIT MONDAL || Part 1|| #chemicalanalysis #pellet

Показать описание

Iron Ore Pellet making process :-

The properties of the pellets and their microstructure mainly depend on the raw material mix proportion, raw material chemical composition and the physicochemical conditions like the temperature and oxygen partial pressure within the induration machine. The pelletizing plant products are in the size range of 8 to 16 mm. With increasing pellet size, the sintering intensity, thermo-chemical conditions and formation of different phases vary across its cross section. The time required for varies reactions within the pellet is directly proportional to the pellet size. Because of differences in pellet size, the reduction and oxidation process takes place under different conditions resulting in different phases and microstructures. In this work, detailed studies were carried out on pellets of different size (8 to 16 mm) produced from a 4.2 MTpa pellet plant for their physical, metallurgical and microstructural properties. It was observed that the pellets in the size range of +8 to -12 mm showed good strength and lower RDI. It was observed that the amount of hematite, magnetite, porosity, pore density, pore size and slag phase play a significant role on pellet strength and RDI.
Poor-quality feed ingredients can be hidden in a pellet
Excessive heat during the pelleting process may decrease the availability of amino acids such as lysine and may destroy some vitamins. 6. Greedy eaters may be more prone to choke, colic, or other digestive disorders.
credibility in fuel supply, transportation and combustion is inferior to gas, oil and electric power
Expanded aquaculture feed is a new type of aquatic feed that is gradually accepted and promoted by the majority of farmers in response to the benign development needs of global fish farming feeds towards low pollution, low waste, high efficiency and high conversion. In recent years, our country’s aquatic feed production has grown rapidly, and shrimp and precious special aquatic feeds have developed rapidly. In these special aquatic feeds, extruded puffed pellets have become the main product form. Since the production lines of extrusion aquatic feeds are mostly new established in recent years, especially the control technology of the operating conditions of the extrusion machine is not perfect, many domestic feed manufacturers are still groping and developing for the processing technology and production characteristics of the puffing aquatic feed. So the processing quality of the feed products produced by various manufacturers will have a big difference. Even the quality of the same variety of products produced by the same manufacturer in different batches may be different significantly. There is no guarantee that the physical characteristics will be stable. After years of experience in production practice ,it is believed that the puffed materials generally have the following defects during processing:

1, Pellets size and length are nonuniform.

Feed pellets vary in size and length, which not only affects the aesthetics of the feed, but also affects the inconsistency of palatability and water resistance time, resulting in unnecessary waste. In addition, it will also become an excuse for farmers to complain

Cause

Solution

Template opening is not reasonable

Customized mold

Feeding is uneven, for a long time

Clean and adjust the feeding mechanism, increase the arching device, and make it evenly fed

Uneven steam addition

Adjust the steam addition point, multi-point, make it even

Uneven water addition

Adjust the water addition point, multi-point, make it even

Uneven mixing

Adjust the mixing uniformity

Blocking phenomenon

Shutdown cleaning mold

Mold hole guide opening difference is too large

Change mold

2, Air holes on the pellets are numerous

There are many air holes in the pellets, and the rough surface not only affects the appearance of the feed, but also the feed is easily broken into powder during transportation, causing unnecessary waste. It is not easy to sink during the feeding process of the feed, and it takes a long time to float.

cause

solution

pellet expansion coefficient is too large

pellet expansion coefficient is too large

Low starch content in the formula

Low starch content in the formula

Ultra-fine thickness is thicker

Ultra-fine thickness is thicker

Excessive mold moisture

Excessive mold moisture

Mold surface is not smooth

Mold surface is not smooth

3, Pellet
Excessive moisture

Reduce moisture during mold release

The outer diameter of the mold cover is too small

Adjust and replace the cover of large space

The mainframe is too large

Reduce host work pressure

Cutter speed is too high
#subhajitmondal
#pellet
#chemicalanalysis
#pelletchemicalcomposition
#pelletindustry