A method of obtaining a granulated filter material

 

(57) Abstract:

Usage: getting granular filter material for natural water treatment drinking water supply and wastewater treatment in filter structures. Dolomite is subjected to grinding and classification to a fraction of 0.3 to 1.5 mm, the Obtained intermediate is subjected to annealing in an atmosphere of air at a temperature of 500-900C for 1-3 hours Then cooled to room temperature and treated with a solution containing ions of divalent manganese (MP2+~ 0.01 to 0.2 mol/l). After this, the solution is drained, and the material is subjected to drying at 100 to 200C. the Material has a high sorption capacity and effectively removes water from iron and manganese to values much below acceptable sanitary standards. table 1.

The invention relates to a method for producing a granulated filter material and can be used in natural water treatment technology for drinking water and wastewater in the filter structures.

A method of obtaining a filtering material, including an introduction to clay suspension of powdered dolomite and subsequent granulation, obigo the first material, including grinding natural material (zeolite tuff), the processing at room temperature with a solution containing ions of divalent manganese, and then an alkaline solution containing hydrogen peroxide and drying at 20-100oC (SU 1491580, B 01 J 2/06, 1989).

In accordance with the recommendations of the world health organization and the requirements of GOST concentrations of iron and manganese should not exceed 0.3 and 0.1 mg/cm3. Such stringent requirements due to the fact that manganese has a negative impact on the human body. The high content of manganese adversely affects the higher nervous activity of man. The high content of iron also adversely affect the body. With continued introduction it accumulates in the liver in the form of colloidal iron oxides, called hemosiderin, which adversely affects the liver cells, causing their destruction.

The objective of the invention is to develop way more available filter material extends the range of filter materials, providing a high sorption capacity with respect to iron and manganese.

The method in accordance with isoenergetic area) - dolomite, fraction up to 10 mm Raw material is subjected to grinding and classification to a fraction of 0.3 to 1.5 mm, the Obtained intermediate calcined in air at a temperature of 500-900oC for 1-3 hours, then cooled to room temperature and treated with a solution containing ions of divalent manganese (Solution: Mn2+~ 0.01 to 0.2 mol/l). After this, the solution is drained, and the material is subjected to drying at a temperature of from 100 to 200oC.

Preliminary mechanochemical activation of dolomite significantly increases the degree of purification of polluted water with its use. In sorption processes become important generated mehanohimicheskoj activation on the surface of various kinds of defects, playing the role of active sorption centers. Profound changes in the structure of dolomite. In addition, when heat treatment is the decomposition of carbonates of magnesium and calcium, with mostly decomposed magnesium carbonate, and when it reaches a certain partial pressure of CO2is recarbonization calcium and magnesium remains in the form of oxide. This fact allows to achieve the required mechanical strength and high sorption capacity of the material. Poslednee covered by manganese dioxide which is formed by drying the material at elevated temperatures of 100 - 200oC.

Manganese dioxide is a catalyst for oxidation of iron and manganese, and allows you to oxidize these elements with oxygen of the air at the time of contact of the treated water with filter loading at flow rates of about 10-15 m/h

An example implementation of the method.

Natural mineral (produced in Leningrad region) - dolomite, fraction up to 10 mm was subjected to grinding in the granulator and used the fraction of 0.3 to 1.5 mm, Then the obtained product was subjected to annealing at a temperature of 800oC for 2 hours in air atmosphere, then cooled to room temperature and treated with a solution of MnCl2the concentration of ions of Mn2+0.1 mol/l, after which the solution was decanted and the material was subjected to drying at 150oC.

The filter column was loaded derived granular material of a grain size of grains of 0.5-1.0 mm, the Height of the filtering layer is 0.6 m, the filtration rate of 10 m/H. the duration of the filtration cycle 4 months. Purification was subjected artesian water, which is characterized by the following indicators:

PH 6.3, turbidity 12.5 mg/l, chroma 250 deg., Fe of 18.2 mg/l, Fe 0.4 mg/l, SW 24 mg/l, the coolant of 0.7 mEq/L.

/HP

The table shows the results of water purification from iron ions and manganese after cleaning 50 m3water.

As can be seen from the test results, the material effectively removes water from iron and manganese to values much below acceptable sanitary standards.

A method of obtaining a granulated filter material, comprising grinding a natural mineral, it is processed at room temperature with a solution containing ions of divalent manganese and drying, characterized in that as a natural mineral dolomite use, after grinding it is subjected to classification to a fraction of 0.3 to 1.5 mm, annealed at a temperature of 500 - 900oC for 1 to 3 hours, and cooling to room temperature, the material drying is carried out at 100 - 200oC.

 

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