SU1581711A1 - Method of preparing charge for making wall ceramic articles - Google Patents

Abstract

The invention relates to the production of building materials, in particular, to methods for preparing a mixture for the production of ceramic wall materials. In order to reduce the washout of heavy metals from fired products and increase their durability, wastewater sludge from electroplating plants, pre-treated with polyacrylamide in an amount of 0.02-0.144% of dry matter of sediment, is introduced into the clay mass, compacted to a moisture content of 90 -95%, the precipitate thus treated is introduced in amounts of 0.4-0.6% of dry matter. This method allows reducing the washout of heavy metals from ceramic products, as well as increasing their mechanical strength to 21.8-22.2 MPa. 2 tab.

Description

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The invention relates to methods for preparing a mixture for the production of ceramic bricks and stones.

The purpose of the invention is to reduce the vybivayemost heavy metals from fired products and increase their strength.

In the manufacture of ceramic wall products, sewage sludge from electroplating plants is introduced into the clay mass, which is pretreated with polyacrylamide (PAA)

in the amount of 0.02-0.14% of dry matter and compacted to a moisture content of 90- 95%.

Sewage sludge of galvanic production has the following chemical composition,%: Fe (OH) 3 57.6-84.0; - Cg (OH) 3 3.44-6.0; C (OH), 15; Zn (OH) 2.6; Ni (OH) 3 3.0; A1 (OH) a 2; Cd (OH) z 1.

The density of the sediment humidity 99-99% is 1.02-1.03 g / cm3.

The density of 0.1-0.2% PAA solution is 1.02 g / cm. Sewage sludge of electroplating production with humidity of 98-99% is treated with 0.1–0.2% PAA solution with a dose of 0.02– 0.14% (dry matter), compacted with gravitational sedimentation in settling tanks moisture content 90-95% and introduced in the amount of 0.4-0.6% in the clay mass. An even distribution of sediment in the mass is provided by two consecutive clay mixers.

Further manufacture of ceramic products in accordance with the adopted technology.

Values of leaching of metals from a ceramic product are given in Table 1, the physicomechanical properties of the finished products are given in Table 2.

Table 1

Metal

Content, mcg / (dm day)

Table 2

A method of preparing a mixture for the production of ceramic wall products, including the introduction of sewage sludge from an electroplating industry into clay masses, characterized in that, in order to reduce the leachability of heavy metals from calcined products and increase their strength, the precipitate is pre-treated with polyacrylamide in an amount of 0.02 -0.14% of the dry matter of the sediment, compacted to a moisture content of 90-95% and injected into the clay raw material in an amount of 0.4-0.6 of dry matter.

Claims (1)

A method of preparing a mixture for the production of ceramic wall products, including the introduction of sludge from wastewater of galvanic production into clay masses, characterized in that, in order to reduce the leachability of heavy metals from calcined products and increase their strength, the precipitate is pre-treated with polyacrylamide in an amount of 0.02-0 , 14% on a dry matter basis of sediment, compacted to a moisture content of 90-95% and introduced into clay raw materials in an amount of 0.4-0.6 on a dry matter basis.