SU571451A1

SU571451A1 - Method of preparing slag-alkali binder

Info

Publication number: SU571451A1
Application number: SU7602306811A
Authority: SU
Inventors: Леонид Андреевич Сильченко
Original assignee: Государственный Проектно-Изыскательский И Научно-Исследовательский Институт "Аэропроект"
Priority date: 1976-01-04
Filing date: 1976-01-04
Publication date: 1977-09-05

Description

1one

Изобретение относитс к промышленности строительных материалов. Оно может примен тьс при получении гидравлических в жущих из шлаков черной и цветной металлургии, затвор емых щелочными рас творами.This invention relates to the building materials industry. It can be used in the production of hydraulic slabs from ferrous and nonferrous metallurgy, which are closed with alkaline solutions.

Известен способ активизации тонкоиэмельченных шлаков черной металлургии растворами веществ, дающих в водной среде щелочную реакцию.There is a method of activating finely ground slags of ferrous metallurgy with solutions of substances that produce an alkaline reaction in an aqueous medium.

При достаточно высокой прочности, в. жущее отличаетс быстрым схватыванием, что не позвол ет использовать его в современной технологии строительных работ . With a sufficiently high strength, c. The subject is distinguished by its rapid setting, which prevents its use in modern construction technology.

Из известных способов наиболее близким к описываемому по технической сущности и достигаемому эффекту вл етс способ получени в жущего путемобработки его паром.Of the known methods, the closest to the described technical essence and the achieved effect is the method of obtaining a live by processing it with steam.

Недостатком этого способа вл ютс также короткие сроки схватывани получаемого в жущего и пониженные прочностные свойства .The disadvantage of this method is also the short setting time of the resulting binder and reduced strength properties.

Цель изобретени - увеличение .сроков схватывани в жущего, что позвол ет значительно расширить область применени шлакощелочных в жущих.The purpose of the invention is to increase the setting time of the aggravating agent, which makes it possible to significantly expand the scope of the slag base in the aggravating agent.

Это достигаетс тем, что обработку молотого шлака осуществл ют при 200-700°С последовательно паром, содержащим ионы щелочных металлов и парами гидрофобных поверхностно-активных веществ .This is achieved by treating the ground slag at 200-700 ° C sequentially with steam containing alkali metal ions and vapors of hydrophobic surfactants.

В основу способа положена химическа реакци между кремнеземом и едким натрием или калием, наиболее интенсивно протекающа при высокой температуре с образованием натриевых силикатов.The method is based on a chemical reaction between silica and caustic sodium or potassium, which most intensively proceeds at high temperature with the formation of sodium silicates.

При осуществлении- способа предварительно приготавливают водный раствор едкого натри или кали . Плотность раствора принимают в пределах от 1,15 г/ /см, до 1,35 г/см, раствор нагревают до кипени , образовавшийс пар, содержащий ионы натри или кали , нагревают до 200 - 700°С.In the process, an aqueous solution of sodium hydroxide or potassium is preliminarily prepared. The density of the solution is taken in the range from 1.15 g / cm to 1.35 g / cm, the solution is heated to boiling, the resulting vapor containing sodium or potassium ions is heated to 200-700 ° C.

Щелочесодержащим паром с температурой от 200°С до 700°С, обрабатывают поверхность шлака, имеющего в своем составе кремнезем. При этом обработку поверхности частиц можно вести как в процессе измельчени шлака, так и на выходе его из мельницы путем обработки ранее измельченного продукла, а также при разгрузке из цементовоза.Silk-containing steam with a temperature of 200 ° C to 700 ° C, process the surface of the slag, which has silica in its composition. In this case, the surface treatment of the particles can be carried out both in the process of grinding the slag and at its exit from the mill by processing the previously crushed product, as well as during unloading from a cement truck.

Claims

During this treatment, a film of anhydrous sodium silicate (potassium silicate) is formed on the surface of the crushed mineral binder. The process of dissolving sodium silicate (potassium silicate) in an alkaline medium is quite long, which slows down the interaction of alkali with slag minerals and glasses of their composition due to the slow diffusion of alkaline solution to the grains through the formed film. However, during storage, sodium silicate (potassium), interacts with carbon dioxide in the air and forms sodium (potassium) carbonates, which cannot serve as a retarding agent for the alkaline alkali. To eliminate this phenomenon, it is necessary to protect the formed sodium silicate (potassium) film from vapors and carbon dioxide of the air. For this purpose, an additional technological operation is required - additional treatment of the product with a film of anhydrous silica with a previously formed on the surface of its particles with surface-active substances, for example, myeloft. This technological operation is carried out according to the method of hydrophobicizing cement or oaz loading the product from a cement truck, as a result, a film of sodium silicate is formed on the surface of the slag minerals and their glass, the destruction of which by alkaline races by thieves proceeds very slowly and ends after 2 4 hours from the time of mixing of the ground slag with alkaline solutions. The consumption of the alkaline component in the solution for the hydration of slag minerals can be reduced by the amount of alkali additive on the surface of the slag particles. In order to obtain low-grade slag-alkaline ones, the mixing of finely ground blast-furnace slag processed by the proposed method with alkali-containing vapors for 10 to 30 minutes can be carried out with ordinary water. The method allows to increase the time of setting the slag alkaline in the slant from 5-40 minutes to 2-4 hours, which increases the viability of the mixtures prepared on the slag base in the slant. Claims The method of obtaining slag alkaline in the ground by treating the ground slag with steam, characterized in that, in order to increase the setting time, the treatment is carried out at a temperature of 200-700 ° C in succession with steam containing alkali metal ions and pairs of hydrophobic surfactants.