The basic principle of slurry filtration

Filtration is a method that makes solid-liquid separation more efficient. The essence is that the pressure difference is used to pass the slurry through a porous medium layer (spacer layer) which is permeable to water and does not penetrate solid particles. Therefore, the basic principle of filtration is to use a substance with many pores (such as filter cloth) as a medium (called a filter medium), so that the liquid in the slurry passes through the pores of the gas, and the solid particles in the slurry are trapped in the pores. On the media. When filtering, the filtered suspension is usually called a filter slurry, and the solid particles trapped on the filter medium are called filter residue or filter cake. The liquid that permeates the filter cake and the filter medium is called filtrate, as shown in Figure 9-6. Show.

As can be seen from Figure 9-6, the slurry should have a driving force to overcome the resistance of the filter cake and the resistance of the filter medium. The driving force of the filtration is the pressure difference between the filter cake and the filter medium. Therefore, depending on the driving force, the filtering methods can be roughly classified into the following categories.

(1) Gravity filtration means that the filtrate is discharged through the filter medium under its own gravity.

(2) Pressure filtration uses a slurry pump or a vacuum compressor to apply pressure to the slurry, forcing the liquid to pass through the filter medium.

(3) Vacuum filtration The vacuum suction caused by the vacuum pump is used to cause the filtrate to be sucked through the filter medium.

(4) Centrifugal filtration, using centrifugal force to remove the liquid in the slurry.

(5) Magnetic filtration combined with vacuum filtration is mainly used for filtration of magnetic products.

Schedule: List of Objects

Silver phase

Silver silver chloride, silver oxide adsorbing Fe, Mn, Ag native silver, silver sulfide, silver, silver galena, sphalerite wrapped silver, silver pyrite and arsenopyrite, quartz, silicate wrapped in silver

Aluminum phase

Gibbsite phase, chlorite, hydromica phase, kaolinite, sericite phase, gibbsite phase

Gold phase

Bare and semi-naked natural gold, carbonated gold, sulphide-coated gold, limonite wrapped gold, quartz and silicate-coated gold

Carbon phase

Carbon, organic carbon, graphitic carbon in carbonate

Calcium phase

Calcium carbonate, fluorite , calcium oxide in silicate minerals

Cobalt phase

Cobalt in oxide, cobalt in sulfide, cobalt in gangue

Copper phase

Oxide copper, copper sulfide, combined phase copper

Iron phase

Magnetic iron, iron carbonate, erythro iron, pyrite, iron silicate

Manganese phase

Manganese carbonate, manganese in pyrolusite, manganese in manganese-bearing hematite, manganese in silicate

Molybdenum phase

Oxide phase molybdenum, iron combined phase molybdenum, sulfide phase molybdenum

Phosphorus phase

Phase apatite phosphorus, iron oxides of phosphorus, phosphorus phase monazite, xenotime phase P

Lead phase

Oxide phase lead, sulfide phase lead, combined lead

Sulfur phase

Natural sulfur , sulfur in sulfate, sulfur in sulfide

Sputum

Yanhua and Fangyu Mine, sulphide, samarium and strontium ore

Titanium phase

Rutile, titanium in ilmenite, titanium in vermiculite and silicate, titanium in titanium magnetite

Tungsten phase

Determination of Tungsten , determination of scheelite , determination of wolframite

Zinc phase

Oxide phase zinc, sulfide phase zinc, and iron combined phase zinc

Nickel phase

Nickel sulfate, nickel sulfide, nickel silicate

Chromium phase

Chromium in magnetite, chromium in silicate, chromium in chrome spinel

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