SU1326568A1 - Method of producing ferroportland cement - Google Patents

Abstract

The invention relates to the building materials industry and can be used to make sulphate-resistant cement. The aim of the invention is to reduce fuel consumption for roasting and increase the hydration activity of cement. In the method, two raw mixtures of the composition are prepared, in May.%: The first is carbonate 79-85, silica-containing 7-10, red mud 8-11; the second is carbonate 60-68, red sludge 30- 34, sulphate-containing production waste 2-6, burn the first mixture at, the second at 1200-1250 0, and when grinding the clinker of the first and second mixtures, take, respectively, in quantities 79-92 and 5 -15 wt.%. Clinker activity in 28 days. 107-I52 kgf / cm, fuel consumption reduced by 1%. 2 tab. O) with tsD O) cd

Description

13265682

The invention relates to the calcium oxide industry, - Clinker 1 of construction materials and toit 52–61% alite, 8–14% belite, and can be used to obtain 19–30% alumoferrites Cg (A, D). - Neither sulphate-resistant cement. You are 1 and 5 in terms of mineral content

refer to the well-known Portland cement, consist of 54-60%, 14-20% | -CjS, 11-18% and 6-10%. A higher temperature is required for firing them than for ferrous portland cement clinker (see

The purpose of the invention is to reduce fuel consumption for roasting and increase the hydration activity of cement.

The method is carried out as follows.

PRI me R. The prepared raw mixes are burned in a laboratory electric furnace until they are fully digestible. one).

The composition and firing conditions of the mixtures are given in table. one.

Clinker 2 contains 30–34% belite, 26–40% calcium sulfoferrite, 16–30% alumoferrites Cj (A, F), etc. With an increase in the sulfate content, it contains a table. one).

The composition and firing conditions of the mixtures are given in table. one.

Table 1

There are technological difficulties in burning clinker due to its melting and welding to the substrate. The composition of sulphate-containing waste is not enough to completely form a sulphate-containing Laza of clinker.

Then, the obtained clinker and gypsum in the ratios indicated in Table 2 were crushed to a specific surface of 3000 cm / g and from a solution of the proposed

The test results in Table 2 show that the proposed method, compared with the known method, has the following advantages: the flexural strength of cement increases by 11%, 6% (7 days), compression strength by 4.4-16.4% ( 7 days). and 7.6-65% (28 days). Since part of the cement burns at a temperature of 150-200 s lower than the main part, the overall fuel consumption for producing ferrous portland cement is reduced by 1%.

With a decrease in the amount of additives in cement, the strength decreases as compared to the known. Increasing the amount of clinker 2 in cement up to 20% requires the selection of a special composition of cement.

sand with a composition of 1: 3 Spo mass at a water-cement ratio of 0.4 were made of balancing specimens measuring 2x2x8 cm. Samples after stripping were stored in water.

 The results of physical and mechanical tests are summarized in table. 2

Table 2

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0

five

0

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Claims (1)

Formula of the invention The method of obtaining the ferric port of land cement by preparing the raw mix, burning and subsequent grinding of clinker pp.3-6% gypsum, characterized in that, to reduce the fuel consumption for roasting and increase the hydration activity of the cement, two raw mixes are prepared, wt. %: first carbonate 79-85, silica-containing 7-10, red mud 8-11, second carbonate 60-68, red mud 30-34, sulphate-containing production waste 2-6, burn the first mixture at 1400 ° C , the second - at 1200-1250 С, and when grinding the clinker and the first and second mixtures are taken respectively in amounts of 79-92 and 5-15 wt.%.