Processing technologies of mineral sand production based on their physical characteristics at pilot plant ,Cox's Bazar By lftekhar uddin chowdhury,BSMEC, B,A.E.C,Cox,sBazar March 08, 2021

 Dry Section

Processing technologies of mineral sand production based on their physical characteristics at pilot plant ,Cox's Bazar By lftekhar uddin chowdhury,BSMEC, B,A.E.C,Cox,sBazar

March 08, 2021

Dry operation process is applicable to drying ,screening ,air classification for

magnetic, non magnetic ,non conductor, Conductor for quality product. Category

equipment is used for this purpose are, lime, w.h.i.m r m s ,crossbelt,for separator

Which is mainly dealing with magnetic properties. High tension separator,

electrostatics, Esp. separator are used for conductor And non conductor properties.

Table concentrate from wet plant as primary non conductor heavies is then feed in

the rotary drum drier up to 90-100;c temperatures. the dried up minerals thus

obtained are lifted to high tension roll separator by bucket elevators H.T. S operate

at Around 35000- 4000dc voltage which to applied to separate conductor from non

conductor fraction. Those conductor fraction is again passed through induced

magnetic separator and diverted to cross belt and bucket elevator to Separate

magnetic conductor and non magnetic fraction high intensity magnetic is run at 0,5 —

1 amp and 200-250 rpm for it As result ilmentite nearly 95-97%grade may be

available non magnetic fraction which is contains rutile as a non conductor Is again

diverted through the same process in H.I magnetic separation which is run at 2.5-

amp and 40-60 rpm to get zircon As a non conductor ,non magnetic. the product is

then passed through shaking table via hydrocylone. Table consecrate Gives zircon

production . again air classification for up gradation if need . garnet and monazite

which is obtained in magnetic and non magnetic is again subjected to Kasson

vibroscreen to upgrade of garnet over size 88-85% under trace monazite Physical

characteristics of mineral sand production in the plant.

Mineral Specific Hardness Magnetic Electrical I Grain size !

gravity properties _ properties range

Zircon 4.69 " 7-7.5 Non - Non 0.25-0.o63

_ Magnetic conductor :AI Vlx

Rutile 4.20 5.55 Non Conductor do

__ magnetic

Ilmenite 4.70 5-6 Low Good do

magnetic conductor

Garnet 3.8-4 6-75 Moderate Non Do

magnetic conductor —

Monazite 4.60 5-5.5 Weakly Non 0.25+0063

magnetic conductor

_._

Kyanite 3.56 4-5.5 Moderate Non do

mag conductor

Quantity of mineral sand deposits located in the costal belt of Bangladesh is reported to be

approximately 4.4 million ton heavy mineral with average 18% of heavy minerals .and it is

suitable for mining either -by wet dredging or dry using earth moving equipment , excavate

and transport the sands .but it has no environmental affect. Australia, sri lanka, India, south

Africa, u.s.a, Malaysia. brazil, Bangladesh are major producer of this minerals . and its

consumed many countries of the world ,including Bangladesh .so it is observed that% grade

of individual mineral achieved in the pilot plant separation varies depending on the deposit

of raw sands .however. pilot plant processing for individual separation has attained

remarkable progress some of mineral production such as magnetite.ilmenite.have been

already reached in commercial grade . the grade of zircon and garnet, is nearly commercial.

Pilot plant small scale production is may be Capac able of demand in our country, if

consumer is Surety of constant ly intending .paper mill, Bangladesh oxygen, pigment

industries and many ceramic industries. Bangladesh insulator and sanitary ware factory,

paper mill, rubber industries. Bangladesh welding electrodes Rahim steel mills, and a few

chemical factory .t.v face plate. Industries, steel mills ,are major users of this mineral of our

countries, titanium, and zirconium Bearing sands and other valuable mineral recovering is

very essential of the country.so that Exploitation initiatives should be, taken for setting