Method for production of sorbent

FIELD: technological processes.

SUBSTANCE: invention is related to the field of environment protection, namely to sorbents for treatment of sewage water, gas exhausts and oil spills, and for ion-exchange treatment of plating industry drains. Method for production of sorbent includes grinding of initial components, mixing, carbonisation, activation, flushing with return alkaline solutions and drying, at that initial components are used: peat, aluminium silicate and black coal, which are ground down to the following particle size, mm: peat 1.0-3.0, aluminium silicate 0.1-0.3, black coal 0.1-0.3, carboniaation is carried out at temperature of 750-800C for 15 minutes without air access, and activation is done in boiling layer in flow of mixture of carbonic acid gas and water vapor at temperature of 750-800C for 15-30 minutes or in atmosphere of oxygen for 3-5 minutes.

EFFECT: production of material with developed specific surface and ion-exchange properties, and also reduction of negative effect at environment in process of production.

1 tbl

 

The invention relates to the field of environmental protection, namely sorption methods of sewage treatment, gas emissions and oil spills, as well as ion exchange wastewater treatment electroplating plants.

A method of obtaining the active coal-catalyst, including the processing of raw materials, obtaining a homogeneous paste for forming granules, forming granules, drying, carbonization, activation, washing mineral impurities and treatment with an alkaline solution. The granules were further treated with aqueous solutions of hydroxides of alkali metals to pH 9-12 when the content of the alkali metal hydroxide in the corner in terms of metal, 0.1 to 1.0 wt.% (see EN 2116832 C1, 10.08.1998).

The disadvantage of this method is the low ion-exchange properties and, consequently, the impossibility of wastewater contaminated with metal ions.

Closest to the claimed method is a method of obtaining a carbonaceous mineral sorbent by mixing zeolite and/or overcredulity breed with combustible material selected from the group of: coal, heavy fractions of oil, peat, wood, and subsequent heat treatment of the mixture with 550-1050C. After heat treatment, the sorbent can be further modified by treatment with aqueous solutions of mineral acids, salts, alkalis or serial is the processing specified reagents with their concentration in the solution is 1-10 wt.% (see EN 2046013 C1, 20.10.1995).

Such sorbents are characterized by high specific surface area and porosity, but these indicators can be improved through the use of gas is activated in a fluidized bed after the stage of carbonization. In addition, the optimal particle size distribution of the initial charge of a number of peat, natural aluminosilicate kaolinite and sintering coal allows to increase the yield of the target fraction of 1-3 mm, most often used in adsorption technology.

The problem solved by this invention is to develop a method of obtaining sorption material with a developed specific surface area and ion exchange properties.

The problem is solved by obtaining the original charge, which includes peat, natural aluminum silicate (kaolinite) and sintering coal, in the following ratio, wt.%:

peat70-80
the aluminosilicate5-10
coal15-20

mixing it carbonization without access of air, steam activation, multi-stage washing with an alkaline solution and drying the obtained granules, while grinding the original charge of the new materials to produce the following quantities, mm:

peat1-3
the aluminosilicateof 0.1-0.3
coalof 0.1-0.3

the carbonization is carried out at a temperature of 750-800C for 15 minutes, and combined-cycle activation is carried out in a current of carbon dioxide and water vapor at a temperature of 750-800C for 15-30 minutes.

In addition, the activation is performed with oxygen at a temperature of 750-800C for 3-5 minutes

As a result of implementation of these stages of peat and coal is formed of active carbon in the matrix of the aluminosilicate.

Declare a set of essential features allows to obtain the following technical result.

At the specified mixing ratio and the grinding parameters, carbonization and activation acquired the opportunity to get a solid sorbent in the form of granules with a size of 1-3 mm, high surface area - 700,7-920,3 m2characterized by advanced ion-exchange properties: total exchange capacity the cation 4.26 deaths-4,93 mEq/g; total exchange capacity of the anion 2,62-2.16 mg-EQ/year

The proposed method is as follows.

The original charge for carbonization has the following status is in, wt.%: peat 70-80, aluminosilicate kaolinite 5-10, sintering coal 15-20. The amount of kaolinite in the original charge is limited to 5-10%, since the increase of its content adversely affects the strength and the yield of the target fraction of the sorbent. Reducing its content has little effect on the ion exchange properties of the obtained sorbent.

The content of sintering of coal should be 15-20%, because the reduction of the negative effect on the strength characteristics of the composite and increase significantly increases the cost of production.

The original charge has the following particle size, mm: peat 1,0-3,0; aluminosilicate kaolinite 0.1 to 0.3; coal 0.1 to 0.3. The size of the original grains of peat was chosen based on the size most frequently used in sorption fraction of 1.0 to 3.0 mm, the grain Size of the aluminosilicate and coal selected for the best Miscibility and uniformity of composition.

The carbonization is carried out at a temperature of 750-800C for 15 minutes. The increase in temperature and duration has a negative impact on the structure of the sorbent due to the burning of organic matter and thermal destruction of the structure of the aluminosilicate. The reduction of these parameters does not allow peat raw materials to carboniteservice sufficiently.

Note also that the product is already at the stage of carbonization m which can be used as a sorbent.

Activation is carried out in the fluidized bed reactor of carbonizate using different activating agents: in a current of carbon dioxide and water vapor at a temperature of 750-800C for 30-60 minutes or oxygen at a temperature of 750-800C for 3-5 minutes.

The choice of temperature and duration of the activation is due to the fact that reducing these parameters activation does not occur in full and remains a large number of closed micropores. With increasing experience high Abgar carbon content and, accordingly, decreases the product yield.

The same temperature for carbonization and activation of the sorbent, namely 750-800C, can reduce the time of transition from one stage to another and ultimately to reduce the production time of the sorbent and its value.

After that, the sorbent sent for shaded particles of alkaline solutions. The number of foot - 3. The duration of stage 4 min Increase in these parameters leads to the destruction of the mineral component of the sorbent, and their reduction does not give the desired effect. Then the sorbent is supplied to the water washing and drying.

Comparative characteristics of the claimed properties of the sorbent and the prototype shown in the table.

The sorbent obtained by the proposed technology has almost equal with prototipo the sorption characteristics, but it has more advanced ion-exchange properties and expanded applications.

The sorbent can be used on tank farms, oil tankers, water, and plants for treatment of household and industrial wastewater.

A method of producing a sorbent, comprising shredding peat, natural aluminosilicate and coal, mixing, heat treatment at 750-800C, washing with an alkaline solution, drying, characterized in that exercise shredding peat to a particle size of 1.0-3.0 mm, and aluminosilicate and coal to a particle size of 0.1-0.3 mm, mixing serves 70-80 wt.% peat, 5-10 wt.% aluminosilicate, 15-20 wt.% coal, the heat treatment is carried out by carbonization for 15 minutes without air, with subsequent activation of the fluidized bed within 15-30 min in a stream of a mixture of carbon dioxide with water vapor or within 3-5 min oxygen.



 

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