SU1513128A1 - Plugging composition - Google Patents

Abstract

The invention relates to the mining industry. The goal is to increase the strength of cement stone with a simultaneous increase in its corrosion resistance when hardening potash ores in brines. The solution contains components in a ratio, by weight. including: caustic magnesite 80-100

acid ash - ablation of solid fuels 10-15

ground calcium or dolomite 5-10

magnesium chloride 21-28

water 39-52. The solution is prepared by mixing the mixture of dry components with an aqueous solution of magnesium chloride with a density of 1.28-1.30 g / cm ³ . The strength of the cement stone during curing for 6 months in brine increases more than 1.5 times. 2 tab.

Description

The invention relates to the mining industry, to cement materials for casing of wells in potash deposits.

The purpose of the invention is to increase the strength and cement stone while at the same time increasing its corrosion resistance when hardening in the brines of leaching of potash ores.

Cement slurry contains ingredients in the ratio, mac.ch .:

Caustic magnesite 80-100

Sour ash ash solid fuels

 Ground calcite or

dolomite

Magnesium chloride

Water

10-15

5-10 21-28 39-52

The cement slurry is prepared as follows: a dry mixture of caustic magnesite, fly ash and ground calcite (dolomite) is sealed with an aqueous solution of magnesium chloride with a density of 1.28-1.30 g / cm.

Example. To experimentally test the cement slurry, ten mixtures were prepared containing various amounts of silica-containing additive (acid ash - ash) of calcite or dolomite with a specific surface of 3500 and a solution of magnesium chloride with a density of 1.28 g / cm- (Table 1). The first batch of samples (compounds 1-5) was prepared with the addition of calcite (chalk), and the second batch (compositions 6-10) - with the addition of dolomite.

Table 1 presents the test results. /

The mixtures are prepared by manually mixing the components in a metallic Mauje, and then pouring it.

with

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00

315

are cylindrical in shape with a diameter and a height of 30 mm. After one day, the samples are taken out of the mold and placed for further solidification of the potassium ore with a density of 1.20 g / cm for brining.

The salt composition of the brine leaching of potash ore (wt.%) Is presented in table 2.

The samples are kept in brine, water and in air for 1.3 and 6 months. After each term they are subjected to a compression test.

From Table 1 it can be seen that compositions 2-4 and 7-9 have the best properties, which contain optimal amounts of target additives and are characterized by higher mechanical strength and corrosion resistance in relation to brines of leaching of potash ore.

The cement slurry can be used at temperatures where the hydraulic activity of the fly ash does not manifest itself.

The combined use of ash - ash and carbonate additives reduces the content of periclase in a dry tampon

284

structure and increased cracking resistance.

The use of cement slurry provides an increase in the life of wells in potash deposits.

Claims (1)

Invention Formula Cement slurry, including caustic magnesite, magnesium chloride, acidic calcium silicate additive and water, characterized in that, in order to increase the strength of the cement stone while simultaneously increasing its corrosion resistance when hardening in brine leaching of potassium ores, it additionally contains a brush calcite or dolomite, and as an acidic calcium silicate additive it contains acid ash - the ablation of solid fuels in the following ratio of components, wt.h .: Caustic magnesite 80-100 Acid ash - entrainment of solid fuels10-15 Ground calcite