SU798070A1 - Raw mixture for producing porous ceramic materials - Google Patents

Description

(54) RAW MATERIALS FOR THE MANUFACTURE OF POROUS CERAMIC MATERIALS

Ground gum argillites90.0 - 99.6

Production waste

limoshy acid from

molasses - filtrate

calcium citrate 0.4 - 10.0

In the production of edible citric acid from molasses, calcium citrate filtrate waste is formed, which is formed in the stage of extraction of calcium citrate from neutralized fermented solutions and contains up to 8% of dry substances by weight, including unwrought sugar, amino acids, organic acids, salts of potassium, calcium others

Below are the results of tests of molding compounds with the introduction of calcium citrate filtrate. Technological processes for the production of various building ceramic materials include approximately the same operations — preparation of the raw mix, molding raw material, essence, and firing. Therefore, in the future, the proposed mass {1 is considered by us as an example of the production of expanded clay, but it can also be used in the manufacture of other ceramic materials. The raw materials used are the argillite of the Veltsky combine of building materials, the filtrate of citrate calcite of the Leningrad plant of food citric acid.

Example 1. Ground argillite with specificity of 2000-3000 is shut off with water. Samples - cylinders with a diameter of 25 mm were obtained by pressing under a pressure of 10 kgf / cm. Molded specimens were dried at a temperature of 100 ° C to a relative humidity of 6%. The content of calcium citrate filtrate and water in the raw mix changed. For comparison, samples without calcium citrate filtrate are molded.

The content of calcium citrate filtrate in 4) feed mixture,%, calculated on the dry matter

13.7 13.6 13.3 11.8

The test results of the samples are given

in tab. one.

Table 1

The content of calcium citrate filtrate in the mold

mixtures,. %, in terms of dry matter

with

From tab. I it follows that the introduction of calcium citrate filtrate significantly reduces the moisture content of the raw material and the energy consumption for drying. At the same time, the raw strength (F 8 kgf / cm) and the bulk density (TU 1700 kg / m) remain unchanged.

Example 2. Samples were obtained under the same conditions as in Example 1, but with respect to the production of expanded clay, the crumbling rate of the granules and the coefficient of swelling during firing were determined. The friability was estimated by the weight loss of dry samples (granules) after testing in a drum with a diameter of 15 cm for 11 minutes. Drum drum speed 60 rpm

The test results are shown in Table. 2

Table

Swelling ratio

Claims (2)

1.21 1.23 1.30 1.57 As can be seen from the table. 2, the introduction of calcium citrate filtrate allows more than a factor of 2 to reduce the crumbling rate of the granules and increase the yield of standard products. At the same time, the coefficient of swelling increases and the bulk density of the samples decreases, which is of paramount importance for claydite, light-weight bricks and other effective ceramic materials. From tab. 1 and 2 it follows that the content of calcium citrate filtrate in the molding composition may vary within wide limits. With a comparatively high content of calcium citrate filtrate. (0.4-0.75%), friability and poor weight are reduced. Increasing the consumption rate of doping to 5.0–10.0% makes it possible to significantly lower the molding moisture of the raw material. Under these conditions, the consumption of calcium citrate filtrate will be determined by its cost and production conditions. P. Example 3. Samples were obtained under the same conditions as in Examples 1 and 2. The consumption of calcium filtrate filtrate is 0.5% by weight of the solid components. In tab. 3 for comparison, the results of testing samples with the introduction of surfactants (sulphite-alcohol stillage concentrate) are presented. Table 3 The citrate filtrate; Calcium 12.9 surfactants .13.4 Without addition13.5 As can be seen from the table. 3, compared with the known surfactants, calcium citrate filtrate leads to a more significant decrease in the moisture content and precipitation of the raw material. The use of calcium citrate filtrate in the production of ceramic materials reduces the moisture of the raw material, volumetric deformations during drying (air shrinkage), reduces the drying time and energy costs, reduces the cost of ceramics, and also allows the use of industrial waste; acid, which has both economic and environmental value. The invention Raw materials mixture for the manufacture of porous ceramic materials, mainly claydite, including finely ground mudstone and a plasticizing agent, it is necessary to reduce the molding moisture and reduce the friability of the molded granules as a plasticizing agent. waste production of citric acid from molasses filtrate of Calcium Calcium in the following ratio of components, wt.%: Fine ground argillites 90.0 - 99.6 Waste from the production of citric acid from molasses - filter Calcium citrate consumption 0.4 - 10.0 Sources of information taken into account in the examination 1. PP Budnikov and others. Ceramics and refractory technologists. Gosstroyizdat, M., 1955.. 2. Shal 'B. V. Use of production efficiency of expanded clay gravel with powder preparation of stone-like raw materials. Collection of works VNIIShrom. M., 1977, p. 28-34.