Method of decontamination of water from radiostrontium

FIELD: methods of the sorption decontamination of waters from the radioactive impurities.

SUBSTANCE: the invention is pertaining to the method of the sorption decontamination of waters from the radioactive impurities. The method of decontamination of the water from radiostrontium includes the treatment of the water with a sorbent based on the burned bauxite ore. At that the ore is burned together with calcium -magnesium lime - CaCO3·MgCO3 and sodium soda salt - Na2CO3 at the temperature of no less than 1200°C and flushed with the water to remove the solvable sodium compounds. It is preferable, that the mixture of the bauxite ore is subjected to burning with calcium-magnesium lime and sodium soda salt in the mass ratio of 1 : 0.55-0.60 : 0.055-0.060. The method ensures an increased effectiveness of removal of the radiostrontium at usage of the initial bauxite ore without lowering of effectiveness of the water decontamination from radiocesium, and also allows to reduce considerably the amount of the spent sorbents, which are subjected to disposal.

EFFECT: the invention ensures an increased effectiveness of removal of radiostrontium from the water at usage of the initial bauxite ore without lowering of effectiveness of the water decontamination from radiocesium, allows to reduce considerably the amount of the spent sorbents, which are subjected to disposal.

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The invention relates to the field of sorption of water purification from radioactive contamination.

The simplest method of water purification from radioactive contamination is the use of natural mineral sorbents, most of which has a silicate structure [1]. And most economically justified is the use for water purification in the regions of local mineral deposits.

As well known method of water purification from radioactive contamination using as a sorbent Cambrian clay Leningrad region. As the clay swells in water, for use in sorption columns, through which passes the treated water, the clay is subjected to heat treatment at a temperature of 750-850°C. in the case of firing at a temperature of more than 900°sorption capacity of the clay is significantly reduced [2].

The main disadvantage of this method is its low efficiency cleanup radiotrance.

Known purification method from Radiostantsiya on Cambrian clay, fired at 750-850°C, mixed with dolomite and phosphate-based ingredient [3].

The main disadvantage of this method is its lack of effectiveness of cleanup radiotrance.

The known method of water purification from Radiostantsiya on limestone rocks, such as calcite (caso ) [4].

The main disadvantage of this method is that high efficiency cleanup Radiostantsiya in this case is achieved only when the content in the purified waters of anions, forming with strontium new crystalline surface (e.g., RHO43-)that in natural waters almost never occurs.

Also known purification method from Radiostantsiya on dolomitic rocks (MgCO3·caso3). A significant role in sorption on dolomite rocks play and silicate (clay) impurities, providing clearing and radiocesium. Moreover, to improve the efficiency of purification of strontium spend the burning of dolomite to a temperature of 720-750°while firing at a temperature of more than 1000°With this efficiency decreases [5].

The main disadvantage of this method is that in the absence of water anions forming insoluble compounds with Mg2+and CA2+(for example, RHO43-), the efficiency of Radiostantsiya not very high.

Also known purification method from radionuclides with natural aluminum mineral gibbsite (Al(OH)3), which is the basis of bauxite rocks. To increase the sorption capacity of bauxite on radiostrontium recommend his treatment at temperatures above 150° [5]. Given the way in its technical essence and the achieved effect closest to the proposed and selected as a prototype.

The main disadvantage of this method is that in the absence of water anions forming insoluble compounds with Mg2+and CA2+(for example, PO43-), the efficiency of Radiostantsiya not very high. In addition, when using the original bauxite ore purification efficiency largely depends on the amount of impurities in limestone and dolomite.

The problem solved by this invention is an effective method of water purification from Radiostantsiya to significantly reduce the amount of waste sorbents disposed.

The technical result of the use of this method is the efficiency of removal of Radiostantsiya when using the original bauxite ore without reducing the efficiency of purification from radioactive caesium.

The invention consists in that in the method of purification of water from Radiostantsiya, including water treatment sorbent on the basis of sintered bauxite ore, calcined ore in conjunction with calcium-magnesium lime (CaCO3·MgCO3and soda sodium (Na2CO3) at a temperature of not lower than 1200°and then washed with water soluble sodium compounds.

Calcination at temperatures above 1200°leads to the decomposition of carbonates and the formation of aluminates, flushing which f is mirouet porous structure. The highest yield is achieved when the mass ratio of bauxite ore, lime and soda 1:0,55-0,60:0,055-0,060.

The method is as follows.

Bauxite slurry obtained when the alumina by firing (sintering) bauxite ore with limestone and soda ash at a temperature of not lower than 1200°and subsequent leaching (leaching) of aluminates of baked (sintered) mixture.

Bauxite ore is calcined together with calcium-magnesium lime (CaCO3·MgCO3and soda sodium (Na2CO3) at temperatures above 1200°C, and then washed with water soluble sodium compounds. The obtained baked product is treated with radioactively contaminated water sorption on it radiotrance.

Compared to known methods of water purification from radionuclides on bauxite sorbents proposed method, including water treatment sorbent on the basis of sintered bauxite ore, and the ore is calcined together with calcium-magnesium lime (CaCO3·MgCO3and soda sodium (Na2CO3) at a temperature of not lower than 1200°and then washed with water soluble sodium compounds, provides not only increased 4-6 fold purification from Radiostantsiya, but also maintaining a high degree of purification from radioactive cesium after firing more than 1000°who, what is not obvious from the prior art (clay minerals, provide clearance from the radiation [2], and dolomite (MgCO3) with limestone (caso3), provide clearance from Radiostantsiya [5], at temperatures above 1000°With significantly lower sorption capacity), i.e. meets the criterion of inventive step.

Examples of specific performance (1-8 by known methods, 9-10 on the proposed method).

Example 1. As treated water used water drinking water containing 100 mg/l HCO3-, 90 mg/l SO42, 10 mg/l Cl-, 5 mg/l NO3-, 60 mg/l of CA+2, 15 mg/l of Mg+2, 15 mg/l Na+, 10 mg/l To+, 0.2 mg/l Fe+3(pH=6,5-7,5) with volumetric activity of 1.4 MBq/l (2·10-5CI/l). As a sorbent for purification of water in static conditions used small fraction (less than 0.1 mm) Cambrian clay. A portion of the sorbent mass of 0.5 g was placed in a 100-ml conical flask, was added 50 ml of the original radioactive solution and smokepole solution followed by settling during the day. The purification coefficient KPTSdefined as the ratio of radionuclide concentration in source and treated water. ToPTSfor90St was about 2.

Example 2. Differs from example 1 in that the Cambrian CH the well was pre-annealed at 750° Back ToPTSfor90Sr was about 3.

Example 3. Differs from example 1 in that as sorbent limestone was used. ToPTSfor90Sr was about 2.

Example 4. Differs from example 1 in that the quality of the sorbent used dolomite. ToPTSfor90Sr was about 5.

Example 5. Differs from example 4 that dolomite was pre-annealed at 750°back ToPTSfor90Sr was about 10.

Example 6. Differs from example 2 in that the Cambrian clay was annealed at 750°mixed with dolomite and Na3PO4mass ratio of 1:0,1:0,1. ToPTSfor90Sr was about 12.

Example 7 (prototype). Differs from example 1 in that the quality of the sorbent used bauxite mixed with clay, dolomite and limestone (bauxite ore Rudinskogo field Leningrad region). ToPTSfor90Sr was about 2, and KPTSfor137Cs was about 4.

Example 8 (prototype). Differs from example 7 that bauxite was pre-annealed at 750°back ToPTSfor90Sr was about 6, and KPTSfor137Cs was about 6.

Example 9 (claimed). Differs from example 8 that the bauxite is mixed with calcium-magnesium lime (CaCO3·MgCO3and soda sodium (Na2CO3) in a mass ratio of 1:0,57:0,057 was annealed at t is mperature 1250° C, and then washed with water soluble sodium compounds. ToPTSfor90Sr was about 25, and KPTSfor137Cs was about 7.

Example 10. Differs from example 7 that as the sorbent used industrial waste production of aluminum from bauxite ore (bauxite ore Rudinskogo field Leningrad region)obtained when it is firing, lime rock, and soda in a mass ratio of 1:0,57:0,057 at a temperature of 1250°together with limestone and soda (in a mass ratio of 3.0:1,7:0,17) and subsequent leaching of the calcined mixture of soluble aluminates. The resulting product contained the 15.6-of 19.2 wt.% SiO2; a 16.5-19.1 wt.% Fe2O3; 9.3 to 10.6 wt.% Al2About3; 2.3 to 2.4 wt.% TiO2; 25,0-28.5 wt.% CaO, 0.6 to 1.1 wt.% MgO; 1.8 to 2.1 wt.% Na2O+K2O; 0,7 of 0.77 wt.% So3. ToPTSfor90Sr was about 24, and ToPTSfor137Cs was about 8.

The proposed method can improve the efficiency of Radiostantsiya 4-6 times without reducing the efficiency of purification from radioactive caesium. The sorbent can be used and cheap production waste (example 10).

Bauxite deposits are widely developed in Russia, and the proposed method can be implemented on the same domestic equipment, as the prototype (mixers and settlers when static is th sorption or filtration columns with dynamic sorption), i.e. industrially applicable. Using this method allows 4-6 times to reduce the consumption of sorbent (i.e. to reduce the amount of waste sorbents disposed), and dynamic sorption 4-6 times to extend the lifetime of filters with one filling.

Sources of information

1. Kuznetsov, Sepetkovski V.N., Cowards A.G. Fundamentals of water purification from radioactive contamination. - M, Atomizdat, 1974, s-213.

2. RF patent №2082235, bull. No. 17, 1997.

3. RF patent №2146403, bull. No. 7, 2000.

4. Kuznetsov, Sepetkovski V.N., Cowards A.G. Fundamentals of water purification from radioactive contamination. - M, Atomizdat, 1974, s.

5. Kuznetsov, Sepetkovski V.N., Cowards A.G. Fundamentals of water purification from radioactive contamination. - M, Atomizdat, 1974, s-229.

6. Kuznetsov, Sepetkovski V.N., Cowards A.G. Fundamentals of water purification from radioactive contamination. - M, Atomizdat, 1974, s-243.

1. The method of purification of water from Radiostantsiya, including water treatment sorbent on the basis of sintered bauxite ore, characterized in that the bauxite ore is calcined together with calcium-magnesium lime (caso3·MgCO3and soda sodium (Na2CO3) at a temperature of not lower than 1200°and then washed with water soluble sodium compounds.

2. The method according to claim 1, characterized in that the firing is subjected to a mixture of bauxite ore with calc the Evo-magnesium lime soda and sodium mass ratio of 1:0.55 to÷ 0,60:0,055÷to 0.060.



 

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