SU814412A1 - Adsorbent for cleaning gases from heavy metal impurities and method of production it - Google Patents

Description

(54) ADSORBENT FOR CLEANING GAS FROM IMPURITIES OF HEAVY METALS AND METHOD FOR ITS PREPARATION Next impregnation of the resulting mixture of 3-20% ferric chloride solution. A distinctive feature of the adsorbent for cleaning gases from impurities of heavy metals is that it additionally contains nonwoven Filtration material from lassac in the following ratio of components, weight,%: Activated carbon 27-54 Ferric chloride 7-35 Non-woven filter sheet The rest of the process technology consists In the following, a moving suspension of powdered activated carbon with a particle size of 0.10, 16 mm is fed to the moving web of nonwoven filter material from lavsan under pressure, then the filtering The material is impregnated with 3–20% ferric chloride solution and dried in a stream of air. Excess activated carbon is blown off with compressed air. Example: A suspension of 5 g of porous activated carbon (AU (grain size 0.10 mm) in 100 ml of water is filtered under reduced pressure on the Schott filter (filter diameter 90 mm) through a layer of non-woven filter material of polyester (tissue thickness 3 mm ), then the filter material is impregnated in 100 m of a 3% solution of ferric chloride and dried in air at room temperature. Excess activated carbon is removed by air blowing. A composition adsorbent is obtained, wt.%: O; AU-27.0 Lavsan - the rest. EXAMPLE 2. Suspension of powdered AU with a grain size of 0.16, is applied to a layer of nonwoven Filter material from lavsan according to Example 1, then impregnated in 100 to 10% ferric chloride solution to obtain an adsorbent of composition (wt.%), 0; AU-40.0; lavsan - Example 3. A suspension of powdered AU is applied to a layer of non-woven filter material from Dacron according to example 1, then it is impregnated into 100 ml of a 20% ferric chloride solution to obtain an adsorbent of composition (wt.%): FeCI.-35.0; AU-54, l pan - the rest. rest. PRI me R 4. A suspension of 2 g of powdered AU with a particle size of 0.16-0.2 mm is applied to a layer of non-woven filter material from lavsan according to Example 1, then a 10% solution of ferric chloride is impregnated in 100 mm. Get the adsorbent composition (wt.%): FeClT, -8,0; AU-1 5, polyacon - the rest. Froze Cp. Non-woven iltrovalous material from lava according to example 1 is impregnated with 100 ml of a 10% solution of chlorine gel. Get the adsorbent composition, wt.%): FeC3-j-51,8; Lavsan - the rest, Example 6. Comparative tests of the efficiency of mercury vapor trapping by the adsorbents obtained in Examples 1, 2, 4, and 5 are conducted. Data on the effect of the composition of the proposed adsorbent on trapping mercury are given in Table 1. where: CQ and Ci ,: - the initial and final concentrations of the starting components (mercury vapor), mg / m; K - gas transmission rate, m / s; t is the process temperature: C; - degree of dustiness ga 3 a,%; 1, - degree of gas cleaning from the source component (mercury), Example. Under the conditions of the examples, the effectiveness of the capture of oxides of mercury, zinc, as well as atomically mercury and dust of starch by absorbents obtained in Examples 1 and 2 is carried out. The results are shown in Table 2 (designations are the same as in Example 6). In the example, a comparative test is carried out on a predisposed separator and known to purify dusty air containing mercury. The results are shown in table 3 (designations are the same as in example b). As can be seen from the data presented in Table 1, the most effective is the use of the adsorbent obtained in compliance with the above interval values of the original ingredients. Violation of these requirements leads to an increase in the residual concentration of mercury and to a decrease in the degree of gas purification from mercury. The data in Table 2 indicate that the proposed adsorbent, that the proposed adsorbent allows Effectively (up to waste standards) to purify gases simultaneously from mercury and its compounds, zinc and dust. Comparative test results of the proposed and known adsorbents show that the three times smaller layer of the proposed adsorbent provides the same degree of purification from mercury, and 2 times more from mercury oxide, as compared to the known. The resistance of the adsorbent increases. However, in contrast to the known adsorbent, which cannot be recovered from trapped dust, the proposed adsorbent, once it reaches a given resistance, is easily regenerated by well-known methods, such as reverse air blowing. The residual resistance of the adsorbent after regeneration practically differs little from the initial one, i.e. the resistance of the adsorbent can be easily maintained at a low level. The degree of air purification from dust by the proposed adsorbent after the formation of a primary dust layer on it increases and approaches 100%.

Thus, the proposed adsorbent with high efficiency provides simultaneous purification of air from mercury and dusts.

The use of the proposed adsorbent for the purification of dusty gases from mercury, in comparison with the known, provides the following advantages:

a) the gas cleaning process is greatly simplified, since there is no need to install a gas pre-cleaning stage for dust;

Based on the adsorbent, compact filtering devices can be created, similar to, for example, bag filters, whose operation can be fully automated.

b) the efficiency of the process increases due to the reduction in the number of gas scrubbing steps, the reduction of energy costs due to the lower aerodynamic resistance of the proposed adsorbent, which can be kept low enough

Level 5 periodic regeneration of the adsorbent, the use of cheaper materials (non-woven CT) or the polyester material from Dacron and powdered activated carbon). The proposed method can find

0 application when cleaning dusty process gases containing various impurities of heavy metals, such as mercury, zinc, lead

5, etc.

99.8

0,002

100

Cj. 0.91 mg / m; And fc 0.02 m / s t "20-22 C H 60%; adsorbent layer thickness 0.3 cm

Table

92.7 0.130 85.7

0, S6b

99.5

0,005 1 Chloric zvlvv5) 0-7.0 50 Activated carbon -27.0 Lavsan - the remaining 2, Ferric chloride-28, O Activated carbon -40.0 10 Lavsan - the rest

where W Oh, 1 m / s t 20-22 C) is a thick layer of adsoroero - see. Known .C / 1018 AU -90.0 180 PrVYaLLga-feClj-28.0 "MayAU -40.0, 180 0.3g 0 , 08 La SFN - szht &

where W 0.1 m / s g t - 20-22Cj - 60%.

Table 2

Claims (2)

Calc 0.08.1 0.0027-97.5 0.53 0.2847.2 0.002 97.5 O, 0.003 99.5 Claim 1. Absorbent for cleaning gases from heavy metal impurities, including activated carbon and chlorine iron, which is different from 4TOf in order to purify the dusty gases, it additionally contains non-woven filter material from lgrsan in the following ratio of components, wt.%: Activated carbon Ferric chloride Non-woven filter material from lavas. 2 Sana. The method for preparing the adsorbent according to the claim that activated carbon is applied to the nonwoven filter material and the mixture obtained is treated with a solution of ferric chloride. 3. The method according to claim 2, characterized in that the activated carbon is applied in the form of a suspension with a particle size of 0.1-0.16 mm. 4. The method according to claim 2 and 3, I differ by the fact that the treatment is carried out with a 3-20% solution of ferric chloride. Sources of information taken into account in the examination. 1. Author's certificate of the USSR 468640, class, 01 D 53/16, 1975. 2. Authors certificate of the USSR 625752, cl. On 01 D 53/02, 1977 (prototype).