Magnesium cement
First Claim
1. A cement product which requires only the addition of water to produce a cement, in which the cement product is composed of two basic cementing ingredients, one ingredient consisting essentially of a material selected from the group consisting of a mixture of dried and calcined magnesium sulphate, calcium chloride, sodium chloride, and anhydrous magnesium oxychloride, and a combination of said mixture with one or more other halides and salts of alkalis and alkali earth elements, which are in general, neutral to mildly acid in reaction,the other ingredient consisting essentially of a material selected from the group consisting of carbonates, and a mixture of carbonates and a member selected from the group consisting of bicarbonates, borates, phosphates, silicates, and alumino silicates, all of the foregoing of alkalis and alkali earth elements which are, in general, neutral to mildly alkaline in reaction,the two basic ingredients in each case containing substantial amounts of magnesium oxide and being finely ground and intimately mixed.
1 Assignment
0 Petitions
Accused Products
Abstract
A reaction product of at least one of magnesium carbonate and magnesium silicate, with a metal chloride at a temperature exceeding 300° C. Such a product, when mixed with water, sets to be an immensely strong magnesium cement. It may have aggregates of various types mixed with it.
55 Citations
18 Claims
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1. A cement product which requires only the addition of water to produce a cement, in which the cement product is composed of two basic cementing ingredients, one ingredient consisting essentially of a material selected from the group consisting of a mixture of dried and calcined magnesium sulphate, calcium chloride, sodium chloride, and anhydrous magnesium oxychloride, and a combination of said mixture with one or more other halides and salts of alkalis and alkali earth elements, which are in general, neutral to mildly acid in reaction,
the other ingredient consisting essentially of a material selected from the group consisting of carbonates, and a mixture of carbonates and a member selected from the group consisting of bicarbonates, borates, phosphates, silicates, and alumino silicates, all of the foregoing of alkalis and alkali earth elements which are, in general, neutral to mildly alkaline in reaction, the two basic ingredients in each case containing substantial amounts of magnesium oxide and being finely ground and intimately mixed.
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2. A method for producing a product which, when mixed with water, sets to a magnesium cement, and which is a reaction product of metal chloride with a material selected from the group consisting of magensium carbonate, magnesium silicate and mixtures, and represented by the general formula MgO-MCl, where M is a metal, said method comprising reacting a metal chloride and water with a magnesium containing substance which includes a material selected from the group consisting of magnesium carbonate, magnesium silicate and mixtures, in a kiln space at a temperature between 300°
- C. and 1000°
C. to release hydrogen chloride, and thereby in turn produce reactive magnesium oxide in combination with other compounds of magnesium and said metal. - View Dependent Claims (3, 4, 5, 6, 7)
- C. and 1000°
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8. A method for producing a product which, when mixed with water, sets to a magnesium cement, and which is a reaction product of metal chloride with a material selected from the group consisting of magnesium carbonate, magnesium silicate and mixtures, and represented by the general formula MgO-MCl, where M is a metal, said method comprising reacting brines with calcium chloride and removing sulphates contained in the brines as gypsum and anhydrite,
crushing materials which include at least one material selected from the group consisting of magnesium carbonate, magnesium silicate and mixtures, and mixing with some but not all of the sulphate free brines, and calcining in a kiln at a temperature exceeding 300° - C. to release hydrogen chloride and thereby in turn produce a first anhydrous product containing reactive magnesium oxide in combination with other compounds,
feeding back at least some of said calcined product to a reaction tank and reacting it with the remainder of the sulphate free brines to form chlor-oxy-hydroxy compounds of magnesium wherein the ratio of magnesium to the chloride radical exceeds 3.6, separating the said chlor-oxy-hydroxy compounds from residual liquir and calcining in a kiln at a temperature between 300°
C. and 1000°
C. to release hydrogen chloride and thereby in turn produce a second anhydrous calcined product containing reactive magnesium oxide in combination with other compounds of magnesium and said metal, and blending said calcined products together. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
- C. to release hydrogen chloride and thereby in turn produce a first anhydrous product containing reactive magnesium oxide in combination with other compounds,
Specification