SU1137076A1 - Method for producing white soot - Google Patents

Abstract

A METHOD FOR OBTAINING WHITE SOOT, including dispersing acidic fluorine-containing silica gel with water followed by spray drying the resulting suspension, characterized in that, in order to simplify the process by eliminating alkaline treatment and increase the oiliness of the product, drying is carried out at 150-400 ° C; C for 35 s.

Description

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The invention relates to the production of white carbon black, used as a filler for chemical plant protection products.

A known method for producing white carbon black involves the treatment of fine-grained g ' of silicic acid carbonate sodium bicarbonate or sodium, followed by calcining at 1000–1700 ° C for 10–60 minutes. l,

However, the oil absorption of the resulting product is low and is 270300 g / 100 g

The closest to the proposed technical essence and the achieved result is a method of obtaining white carbon black, including dispersing acidic fluorine-containing gel of silicic acid, carbonate-alkaline treatment of the resulting suspension to a pH of 5-7 for 30-60 minutes followed by spray drying at 500-850 ° C within 0.01-0.2

The disadvantages of this method are its complexity and the oil absorption of the resulting product is not high enough.

The purpose of the invention is to simplify the process by eliminating alkaline treatment and increasing the oil absorption of the product.

The goal is achieved by the fact that according to the method of obtaining white

carbon black, which includes dispersion of water with an acidic fluorine-containing silica gel, followed by spray drying the resulting suspension. The drying is carried out at 150-400 ° C for 3-5 seconds.

The technology of the method is as follows.

The silica gel is dispersed in water or a washing liquid obtained after wet cleaning of waste gases from. drying gases. Then the suspension is spray dried at 150 ° C for 3-5 seconds.

Bela soot, obtained by the proposed method, has an oil absorption of 340380 g / 100 g

The indicated conditions on the temperature and duration of drying are the most optimal for obtaining white carbon black with the described value of oil absorption. These conditions allow to obtain a product with high sorption properties, despite the exclusion of preliminary carbonate-alkaline treatment of acidic gel of tartaric acid.

The results of experiments to determine the effect of the distinctive features of the proposed method on the oil absorption of white soot are shown in the table.

Table continuation

Note. As can be seen from the above data, the preliminary carbonate-alkaline treatment of silica gel and the proposed heat treatment conditions does not exceed the oil absorption of the product 280 g / 100 g. Under optimal conditions, the oil absorption of the product obtained by the proposed method is, on average, somewhat higher than in the prototype. A decrease or decrease in temperature, as well as a decrease in the duration of drying compared with the specified optimal limits, leads to a deterioration in the sorption properties of white soot (oil absorption decreases). Increasing the duration of heat treatment for more than 5 s does not increase the oil absorption of the product. In connection with this, the temperature should be limited to,. g- - to rot 150-400С, and duration suyuky 3-5 sec. Example 1.100 g silica fume from the production of aluminum fluoride 1-8 with preliminary alkaline treatment of silica gel (combination of the prototype from the previous method a), test 9 prototype, tests 10-15, proposed method (optimal conditions), tests 1623 proposed method (not optimal conditions) . mini containing 50% water dispersed in 300 kg of water. The resulting suspension is subjected to thermal spray treatment at 150 ° C for 3 seconds. As a result, 49 kg of white soot with a water content of 2.1% and an oil absorption of 355 g / 100 g are obtained. Example 2. 100 kg of silica gel with a water content of 50% are dispersed in 300 kg of a 1F1 liquid obtained after wet cleaning of waste from the dryer gases. The slurry is dried for 3 seconds. 50 kg of white carbon are obtained with a water content of 3.2% and an oil absorption of 365 g / 100 g. Example 3. 100 kg of silica gel with a content of 60% N „0 is dispersed in 300 kg of water and dried at 150 ° C for 3 s. Get 39 kg of white carbon black with a content of 1.3% H „0 and an oil absorption of 350 g / 100 g. Example 4. 100 kg of silica gel with a content of 60% HgO dispersed

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400 kg of water and dried at 150 ° C in. with a content of 2.0% H-O and oil for 5 seconds. 39.5 kg are obtained by whiteness 380 g / 100 g.

soot with a content of 2.7 Z H 0 and oil. Thus, the proposed capacity of 370 g / 100 g allows to obtain white carbon with

Example 5. 100 kg of cremiegel 5 high sorption properties

with a content of 60% NooA, the dispersive stage is at the same time a pre-stage of 300 kg of water and dried by inoculant-carbonate treatment

for 5s. Get 39 kg of white sa-precipitate silica gel.

Claims (1)

METHOD FOR PRODUCING WHITE SOOT, including dispersing silicic acid acid fluoride gel in water followed by spray drying of the resulting suspension, characterized in that, in order to simplify the process by eliminating alkaline treatment and increasing the oil absorption of the product, drying is carried out at 15 ° -4 ° C for 35 sec