RU1837055C - Raw material mixture for producing anhydrite binder - Google Patents

Description

The invention relates to the building materials industry and can be used to make building products.

The purpose of the invention is to increase the intensity of hardening.

, To prepare the raw material mixture, the following raw materials are used: - fpsfogypsum. %: Ca037; 50z54; 5U20.5; H20z 1f; WG 1,2; R205vr. 0.6; R „bsch. 0.4; Rvr. 0.01.

- sludge from water neutralization of the production of glass products,%: CaO 45.09; 13.97; 50c 5.05; P20z 10.0.1; Rochel 3.75; n.jn.n. 21.40.

-the sludge from the neutralization of fluorine fluoride | hydrogen wastewater from the production of micronutrient fertilizers (Kedainoisky chemical plant-d. Lit.SSR),%: CaO 16.3-22.9; SI02 10.3-20.4; R-i Oz 29.6-31.1; POZ 5.9-8.8; RaOz 6.9-13.7; F 6.2-13.7; p.p.p. 3-6.

- clay quarry Disnos (Ignalina Lit.SSR). %: SI02 52.10; T102 17.20;

R203 7.91; CaO 5.61; MdO 3.98; CgO 3.20; N3200.31; p.p.p. 0.31.

Phosphogypsum with a moisture content of 25% in an amount of 1 ton is neutralized with a lime suspension with a liquid: solid ratio of 1: 1. To the neutralized phosphogypsum (pH 7.0-7.5), 225 kg of clay with 20% humidity and 55.5 kg of sludge with 48% humidity are added with constant stirring. The resulting pulp is stirred for 10 minutes, after which the pulp is pumped to the drum vacuum filter with a submerged pump. The filtered mixture is fed to a rotary drum oven at 950 ° C and fired for 30 minutes. The obtained material in the form of granules is subjected to grinding in a ball mill to a specific surface of 170-200 m2 / kg. The prepared anhydrite binder is sealed with water at a ratio of water: b - / B / B / - 0.25, Suttard plasticity was 12 cm. Samples made from anhydrite binder are kept in air-humid conditions.

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with a relative humidity of 95-100%.

The composition of the raw mix and the basic physicomechanical properties of anhydrite binder are given in table 1 according to the proposed technical solution and table 2 according to the prototype ...

As follows from the above data, the proposed raw material mixture provides anhydrite binder with a high hardening rate.

Forms of the invention

A feed mixture for preparing an anhydrite binder including phosphogypsum and

kalidium-containing additive, characterized in that, in order to increase the intensity of hardening, it as a calcium-containing additive contains sludge from

the neutralization of water for the production of glass products or sludge from the neutralization of hydrofluoric water for the production of mineral fertilizers and additionally clay in the following ratio of components,

wt.%: phosphogypsum 80-90; sludge from neutralization of water for the production of glass products or sludge from neutralization of fluorosilicon wastewater from the production of mineral fertilizers 2-10; clay 5-15.

The results of the tests of anhydrite cement prototype

Table 2