Development of Magnesian Cement Producing Technology on the Ural Region Raw Materials Basis

I.D Kashcheev,A.V Doronin,L.B Valieva,K.G Zemlyanoy

doi:10.18502/kms.v6i1.8050

Abstract

This article considers an effective way of processing natural and technogenic magnesium-containing materials, which will release magnesium oxide and magnesium sulphate for the production of magnesian cement. Using this method, pure magnesium oxide, magnesium sulphate and magnesium sulfate have been obtained, the study considers the properties of magnesian cement with differeng magnesium oxide production conditions. Keywords: non-conventional magnesium containing raw materials, technogenic materials, magnesian cement, hydrochemical processing, ammonium hydrosulfate

Highlights

Publishing services provided by Knowledge EThe main type of binder for fire-resistant building materials is calcium cement portland, alumina, high alumina
The main disadvantage is the need for heat treatment to achieve initial mechanical strength and water resistance; for silicate binders, the presence of a significant number of alkalis and, low fire properties of materials; For magnesian binders it is a limited availability of magnesian cement, relatively low water resistance when using low-quality binders and temperature range of dishardening 450 - 900 ∘C, associated with the decomposition of hydrate compounds
The systematic increase in the cost of cements, both domestic and imported, prompts to look for alternative binders with a similar set of properties

Summary

Publishing services provided by Knowledge E

The main type of binder for fire-resistant building materials is calcium cement portland, alumina, high alumina This is due to both technological and economic reasons, the most important of which are setting times and high strength, as well as availability and relatively low cost. 2) Filtration of acid-resistant residue containing RO2, R2O5 oxides for subsequent use as a raw material for the production of building materials, refractories, ceramics, abrasives, etc; 3) Iron deposition from ammonia solution and separation of iron hydroxide III for further use in the production of pigments; FeSO4 +Fe2(SO4)3 + 6 NH4OH = 2 Fe(OH)3↓+ 3 (NH4)2SO4; 4) Magnesium precipitation from ammonia solution and separation of magnesium hydroxide for further use as a raw material; 2MgSO4 + 2NH4OH = 2MgOH ↓+ 2(NH4)2SO4; 5) obtaining a pure solution of ammonium sulfate from which crystallites’ ammonium sulfate is extracted; which is thermally decomposed into ammonium hydrosulfate and ammonia by reaction according to the technology developed and tested on a pilot industrial installation:.

Setting times

Findings

Conclusions