SU1606181A1 - Method of producing sorbent for extracting phosphorus from phosphorus slurry - Google Patents

Abstract

This invention relates to chemical technology. The method of obtaining a sorbent for the extraction of phosphorus from phosphorus sludge is carried out by using bentonite (montmorillonite) clay as a raw material, cleaning it from mechanical inclusions, drying to air-dry state, mechanical grinding, mixing powdered clay with an optimal amount of water to obtain plastic formable mass, its granulation by extrusion method, drying of the granules and their heat treatment in air at elevated temperatures. In order to increase the specific yield of phosphorus when removing it from the phosphorus sludge and increase the duration of the sorbent layer before mining, requiring subsequent regeneration, due to an increase in the pore volume in the sorbent with optimal sizes for phosphorus destruction, giving the sorbent 100% water resistance when working in mountains whose aqueous medium and high mechanical strength it is proposed to finely disperse air-dry clay before mixing with water with 10-20 wt%. fine carbon black, and the molded dry granules are thermally treated in air at a consistent rise in temperature to 600–700 ° C with exposure at the final temperature until complete thermal oxidation of the introduced fine carbon black. 1 hp f-ly, 2 tab.

Description

The invention relates to chemical technology, in particular to the preparation of mineral sorbents, and can be used to obtain mechanical durable, water resistant and high pore adsorbents based on natural bentonites;

for the removal of phosphorus from phosphorus sludge, as well as for use in sorption separation and purification of target components from the liquid phase.

The purpose of the invention is to increase the degree of phosphorus recovery from sludge and

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increase the service life of the sorbent while maintaining its performance at a high level.

Example: 1c. Shows the conditions for granular sorbent foams from a moldable mass containing 95% by weight of bentonite clay Gift from the Basinsky deposit of the Kazakh SSR and 5.0% by weight of carbon black (GOST) grade K 354 ().

To obtain sorbent 47 ,, 5 kg of bentonite clay is freed from mechanical impurities, dried at 105–110 ° C to a moisture content.% Dispersed in a ball mill to obtain a product with an hour size of less than 150 microns. Finely dispersed clay is mixed with 2.5 kg. technical carbon grade K 354 (DG-SO) ;, the mass is thoroughly mixed. Then, with stirring, add kg of tap water, mix, plastic homogeneous mass is formed in a rotary cutter through a filter with a hole diameter of 3 m. The resulting granules are filled in air for 20 hours, then suspended by air at a dry state at 105 " 1 for 8: Cha Dry granules are thermally treated in air when the temperature rises from 120 to 600 700 ° C for 8 h, holding at the final temperature for 1 h until complete burnout of the carbon black contained in the technical carbon granule is cooled to a room temperature. Temperatures for hours, screened out from dust at the screen and closed into metal drums. The characteristics of the obtained sorbent are shown in the scoreboard: 1 in

Example; 2c Shows the VIA method for producing a granulated sorbent containing 90 masv% bentoni with YOU clay from the Darbazin deposit NIN Kazo SSR and 10 wt% carbon black (GOST 7885-86Е) grade K 354

() e

It is carried out similarly to Example 1, except that 45.0 kg of bentonite clay and 5 kg of technical grade K 334 carbon dioxide are taken to obtain the sorbent. Sorbent characteristics are given

in table about 1 in

Example: 3c Shows the conditions for the preparation of granulated sorbent containing 85 masv% bentoni

YOU clay of the Darbazin gorge denis Kaz, SSR and 15 MaiCe% technical gr of carbon (GOST 7885-86K) mark K 354 ().

It is carried out similarly to Example 1, except that 42.5 kg of bentonite clay and 7.5 kg of K 354 carbon black are taken for the preparation of the sorbent (The characteristics of the sorbent are given in the table: 1 in

Example: 4 "Shows the conditions for the production of granulated sorbent containing 80 masv% bento nitic clay from the Darbazin place of birth, Kaz" SSR and 20 mass% of carbon black (GOST 7885-86E) of the mark K 354 (). except that 40.0 kg of bentonite clay and 10.0 kg of carbon K 354 () are used to obtain a sorbent, the characteristics of the sorbent are given in Table 1a

Example: 5о Shows the conditions for obtaining granulated litter, a bent containing 75 wt% of bento nitic clay from the Darbaza deposit Kaz "SSR and 25 wt.% Of technological carbon (GOST) of the grade K 354 (DG-100) s. It is carried out similarly Example 1, except that to obtain a sorbent, take a kg of bentonite clay and 12.5 kg of K 354 carbon black () The characteristics of the sorbent are given in Table.

Examples 6-1Оа Show the conditions for the preparation of granular sorbents containing respectively 95, 90, 85, 80, 75 masv% bentonite clay from the Azkama deposit UzbSSR and 5, 10, 15, 20, 25 wt.% Technical carbon (GOST) grade K 354 (), Carried out similarly to examples 15, respectively, except that 19.6 kg of zinc are added to the mixture of powdered bentonite clay and carbon black with stirring, and the mass is thoroughly mixed and granulated.

Examples Show the conditions for the preparation of granular sorbents containing, respectively, 95, 90, 85, 80, 75% yyjace bentonite clay from the Oglanlyn deposit.

Turkmen SSR 5, 10, 15, 20, 25 wt.% Carbon black (GOST 7885 86E of the mark K 354 (). Carried out analogously to examples 1-5, respectively, except that the mixture of powdered bentonite clay and technical 24.1 kg of water are gradually added to the carbon with stirring, the mass is thoroughly mixed and granulated. The characteristics of the sorbents are given in Table: 1 "

It can be seen from the data presented in Table 1 that the optimal content of carbon black in formable mixtures of fine components in the preparation of granulated sorbents from bentonites for the separation of phosphorus from a phosphorus sludge is 1020% by weight. Given specific examples of the proposed method they provide granulated sorbents with a total porosity of 0.53 0.86, water resistance in a hot water environment, mechanical abrasion resistance, and fraction of the pore volume with optimum for separating phosphorus equivalent nanometer radii in the porometric volume of sorbentosis obtained by the proposed method is

An increase in the content of technical carbon in the moldable mixture above 20 masv% is inexpedient} as this reduces the mechanical strength of the sorbents for abrasion and decreases the proportion of the pore volume with equivalent radii of nm in the total porous volume of the sorbents. carbon black below 10 wt.% does not provide better. granulated sorbents with a developed pore volume of optimal size for phosphorus separation from phosphorus sludge

Analysis of the data presented in Tabla and 2 shows that the proposed method of obtaining sorbents allows obtaining samples with a total porosity and porometric volume of, respectively, 7 and 6 times larger than that of the sorbents obtained by the prototype method. the sorbents obtained by the proposed method are much more active in

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the process of extracting phosphorus from phosphorus sludge than samples obtained by the prototype method (Table 2).

Testing the operational properties of sorbents was carried out on the original laboratory setup and according to the Lenniigiprokhim method.

The data in Table 2 show that the specific yield of phosphorus from phosphorus sludge in the obtained sorbents per unit volume of the sorbent layer is 1,, 6 times higher than in the prototype sorbents, and the time of the complete

15 ki of the sorbent layer before regeneration in the obtained sorbents is 1, 5 times more than in the case of the sorbents. From this it follows that d, r1 in the end neither the same amounts of phosphorus from

20 sludge requires several times less amount of sorbent obtained by the proposed method, compared with the sorbent obtained by the prototype method. Consequently,

25 in practice, in this case, the production costs for the manufacture of sorbent will be significantly reduced.

In addition, the decrease in the required amount of sorbent per unit

30 masses of the processed sludge leads to a reduction in the size of the sorption unit, to a reduction in the required production areas, capital and operating costs. Increased

the duration of the sorbent slab operation before regeneration leads to a decrease in the annual number of required regenerations, which ensures a significant reduction in energy

40 and operating costs, and also helps to increase the safety of operational properties of the sorbent and reduces its losses in the process of regi

neration.

Claims (1)

Invention Formula ; 1 s. A method of obtaining a sorbent for the extraction of phosphorus from phosphorus sludge, including dispersion of air-dry bentonite clay, CQ addition of water, granulation by extrusion, drying and heat treatment on air. 45 spirit, characterized in that, in order to increase the extent of phosphorus entrainment from the sludge and increase the service life of the sorbent while maintaining its performance characteristics at a high level, air-dry clay is mixed with wt.% fine technical coal of the kind, and the heat treatment is carried out during the rise, the temperature is up to withheld at the indicated temperature until the thermal oxidation of carbon is complete. 16061818 .2 The method according to; p “1, differs from and in that the temperature rise from 120 to 600–700 ° C is carried out for 8 h, and the shutter speed for 3 : 4; h. Tables of granulated granular eorbentol obtained by the proposed method and proto-process method T a and l The output of phosphorus, the time of the sorbent mining layer before its regeneration and the degree of phosphorus release of the short-circuit phosphoric oxide sorbents obtained by the proposed method and the prototype method Editor: Th "Casarda Compiled by: T “Chilikina Tehred l. CepAioKOBa Order 3511 Circulation 417 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5 a i Proofreader; VvGir11Yak Subscription