SU939421A1 - Raw mix for making aggregate - Google Patents

Description

(54) RAW MIXTURES FOR MANUFACTURING

The invention relates to the production of building materials, specifically to the composition of the raw mix for the manufacture of white and colored aggregates, which are used in the compositions of various concrete mixtures.

The known raw material mixture for the manufacture of aggregate 1, comprising, in wt%: aluminum production wastes 20-25; sulphite-alcohol bard 1-2; coal 6-7 and dolomite 66-73.

However, the aggregate from this mixture has insufficient strength.

Closest to the proposed technical essence is the raw material mixture for the manufacture of aggregate 2, comprising, wt.%: Sand sand 60-80; Bentoa; 1tovuyu clay 15-30 and coal 5-15.

However, the aggregate of the known mixture has insufficient strength, and the presence of coal does not allow to obtain white and colored aggregates. The insufficient strength of the aggregate does not allow its use in the upper layers of road surfaces.

The purpose of the invention is to obtain a white filler of increased strength of the FILLER

tee and color filler while maintaining the basic properties.

The goal is achieved by the fact that the raw mix for the manufacture of aggregates, including sand and additives, contains as an additive dolomite in the following ratio of components, wt.%:

Sand.45-65

ten

Dolomit

Raw mixture additionally contains, wt%: or cobalt oxide 0.2-1.0; or chromium oxide 0.5-2.0.

15

The introduction of dolomite as an additive results in the formation of calcium-magnesium silicate glass phase upon its interaction with sand in the smelting plant,

20 which, together with the silica sand, dissolves and impurities of iron oxides contained therein. The glass mass has enhanced crystallization properties, and upon cooling and by additional heat treatment, it crystallizes to form a strong material. At the same time, as a result of dissolution in .st; clophase during crystallization of the products, the color caused by

30 pk1 "; lamy iron, discolored.

what gives the chance to receive white filler.

When the content of dolomite is less than 35, a smaller amount of glass Lofase is formed, the grains of the remaining undigested sand do not bind sufficiently firmly and the strength of the material sharply decreases. With an increase in the dolomite content of more than 55% by weight, the glass phase formed has a high basicity and the iron compounds in it are in the trivalent state, which, during crystallization, leads to the formation of a yellow-green color.

Increasing the content of chromium oxide and cobsht over these limits does not lead to a further increase in the intensity of color, but increases the cost of aggregate.

When the content of cobalt oxide is less than 0.2 wt.% And chromium oxide is less than 0.5 wt.%, There is not enough intense staining of the aggregate.

The introduction of dyes does not change the basic properties of the filler.

 Dolomite before mixing was crushed to pieces of size up to 50 mm. The components of the raw mix in a predetermined ratio are fed into the plan-

Heavy unit with burners immersed in the melt. The mixture burns in the melt, with this, there is an intensive mixing of the melt with products of combustion. Temperature . melt 1550 ° C, holding time 0.5 h.

The mixture melted in such conditions has a light blue color and is saturated with combustion products. After ebbing, the melt may contain a significant number of unwrought grains of sand or dolomite. The melt contains a large number of pores (up to 40 - 60%). After cooling, the melt is crushed and calcined at 5,900-1,100 ° C for 0.25-1 hours.

The filler obtained from the heat treatment is white.

If necessary, mineral dyes can be added to the mixture: cobalt oxide is added to the raw mix to obtain a blue filler, and chromium oxide is added to form a green filler.

The specific compositions of the proposed raw material mixture for the manufacture of the aggregate, as well as the manufacturing parameters and the composition of the known raw material mixture are listed in Table 1.

Table

0.5 0.2 1

Known N ote.

0.5 2.0

5-15

60-80

15-30 The melt of the proposed composition of the raw material mixture is carried out for 0.5 h, firing - for 0.5 h.

The indicators characterizing the quality of the.

and known syrfev mixtures / are listed in Table 2 ..

Claims (2)

Claim 1. The raw material mixture for the manufacture of aggregate, including sand and additive, characterized in that, in order to obtain a white aggregate of increased strength, it contains dolomite as an additive in the following ratio of components, wt.%: Sand 45-65 Dolomite rest 2. The mixture according to claim 1 is distinguished by the fact that, in order to obtain colored filler while maintaining the basic properties, it additionally contains, wt.%: Or cobalt oxide 0.2-1.0; or chromium oxide 0.5-2.0.