# US 10,766,818 B2 · Supplementary cementitious material made of aluminium silicate and dolomite

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- Number: US 10,766,818 B2
- Document ID: US10766818B2
- Status: Granted
- Kind: B2
- Application number: 16/095,159
- Filed: 2017-05-23
- Published: 2019-05-16
- Granted: 2020-09-08
- Earliest claimed: 2016-05-24
- Assignees: HConnect 2 GmbH
- Applicants: HeidelbergCement AG
- Inventors: Frank Bullerjahn; Maciej Zajac; Dominik Nied
- Web page: https://patentgrep.com/patent/US10766818B2

## CPC

- C04B 28/04: Portland cements
- C04B 7/12: Natural pozzuolanas; Natural pozzuolana cements; {Artificial pozzuolanas or artificial pozzuolana cements other than those obtained from waste or combustion residues, e.g. burned clay; Treating inorganic materials to improve their pozzuolanic characteristics (cements containing slag C04B7/14)}
- C04B 7/13: Mixtures thereof with inorganic cementitious materials, e.g. Portland cements
- C04B 14/041: {Aluminium silicates other than clay}
- C04B 14/28: of calcium
- C04B 20/04: Heat treatment
- C04B 28/065: {Calcium aluminosulfate cements, e.g. cements hydrating into ettringite}
- C04B 2103/0088: {Compounds chosen for their latent hydraulic characteristics, e.g. pozzuolanes}
- C04B 2103/12: Set accelerators
- C04B 2103/14: Hardening accelerators
- C04B 2103/20: Retarders
- C04B 2103/302: {Water reducers}
- C04B 2111/00637: {as glue or binder for uniting building or structural materials}
- C04B 2111/60: Flooring materials
- Y02P 40/10: Production of cement, e.g. improving or optimising the production methods; Cement grinding
- Y02W 30/91: Use of waste materials as fillers for mortars or concrete
- C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02W: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT

## Abstract

This invention relates to a method for producing a supplementary cementitious material comprising the steps: providing a starting material containing dolomite and aluminium silicate, converting the starting material to the supplementary cementitious material by burning under reducing conditions in the temperature range of >700 to 1100° C. or by burning in the temperature range of 625 to 950° C. in the presence of a mineraliser, and cooling the supplementary cementitious material. The invention further relates to a binder comprising cement and to the ground supplementary cementitious material.

## Claims

### Claim 1

A method for producing a latent hydraulic and/or pozzolanic supplementary cementitious material, including adjustment of the colour thereof, comprising the steps:
Provision of a starting material containing an aluminium silicate constituent and a dolomite constituent and having a ratio (SiO2+Al2O3)/(CaO+MgO) from 0.7 to 6,
Conversion of the starting material to the supplementary cementitious material by burning the starting material under reducing conditions in the temperature range of >700° C. to 1100° C. if no mineralisers are contained, and in the temperature range of 625° C. to 950° C. if mineralisers are contained.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the starting material is obtained by mixing and combination grinding of dolomite constituents and aluminium silicate constituents.

### Claim 3 (depends on 2)

The method according to claim 2, wherein before or during the grinding, one or several grinding aids are added, which are chosen from the group consisting of glycols, alkanolamines, alkyl dialkanolamines, and mixtures thereof.

### Claim 4 (depends on 1)

The method according to claim 1, wherein a mixture containing 40 to 80 wt % aluminium silicate constituent and 20 to 60 wt % dolomite constituent is used as a starting material.

### Claim 5 (depends on 1)

The method according to claim 1, wherein the starting material, calculated on a loss on ignition-free basis, contains at least 5 wt % MgO occurring as carbonate.

### Claim 6 (depends on 1)

The method according to claim 1, wherein the starting material, calculated on a loss on ignition-free basis, contains at least 8 wt % Al2O3.

### Claim 7 (depends on 1)

The method according to claim 1, wherein the starting material, calculated on a loss on ignition-free basis, contains at least 15 wt % SiO2.

### Claim 8 (depends on 1)

The method according to claim 1, wherein the starting material is burned in a directly or indirectly fired rotary kiln, shaft kiln, or multi-deck oven for 5 to 240 minutes under reducing conditions.

### Claim 9 (depends on 1)

The method according to claim 1, wherein the starting material is burned in a fluidized-bed reactor or in a flash calciner for 5 to 300 seconds.

### Claim 10 (depends on 1)

The method according to claim 1, wherein the reducing conditions are established by adding carbon, carbon monoxide, organic compounds, ammonia, sulphur, or methane and/or by choosing an appropriate amount of fuel and/or by minimizing an oxygen input.

### Claim 11 (depends on 1)

The method according to claim 1, wherein the supplementary cementitious material is ground to a fineness of 2000 to 10,000 cm2/g (Blaine).

### Claim 12 (depends on 11)

The method according to claim 11, wherein before or during grinding, one or several grinding aids are added, which are chosen from the group consisting of glycols, alkanolamines, alkyl dialkanolamines, and mixtures thereof.

### Claim 13 (depends on 1)

The method according to claim 1, wherein the starting material does not contain any mineralisers and is burned at 825° C. to 1000° C.

### Claim 14 (depends on 1)

The method according to claim 1, wherein the starting material contains one or several mineralisers and is burned at 675° C. to 900° C.

### Claim 15 (depends on 14)

The method according to claim 14, wherein the mineraliser or mineralisers is/are chosen from the group consisting of borax, waste glass, iron salts, alkaline salts and/or alkaline earth salts.

### Claim 16 (depends on 4)

The method according to claim 4, wherein the starting material, calculated on a loss on ignition-free basis, contains at least 7 wt.-% MgO, at least 15 wt.-% Al2O3 and at least 25 wt.-% SiO2.

### Claim 17 (depends on 2)

The method according to claim 2, wherein the starting material does not contain any mineralisers and is burned at 850° C. to 975° C.

### Claim 18 (depends on 11)

A binder comprising
a ground supplementary cementitious material, obtained according to claim 11, and
at least one cement, which is selected from among Portland cement, calcium sulphoaluminate cement, and calcium aluminate cement, and/or
at least one activator, which releases aluminium and/or silicon in the form of ions.

### Claim 19 (depends on 18)

The binder according to claim 18, wherein it contains from 1 to 90 wt % cement or activator and from 10 to 99 wt % supplementary cementitious material.

### Claim 20 (depends on 18)

The binder according to claim 18, wherein it contains an additional sulphate carrier.

### Claim 21 (depends on 18)

The binder according to claim 18, wherein one or several setting and/or hardening accelerators, chosen from the group consisting of aluminium salts and aluminium hydroxides, calcium (sulpho) aluminates, alkaline salts and alkali hydroxides, alkali silicates, and mixtures thereof, are contained.

### Claim 22 (depends on 18)

The binder according to claim 18, wherein it contains one or several activators in an amount of 0.1 to 5 wt % based on the amount of the supplementary cementitious material.

### Claim 23 (depends on 18)

The binder according to claim 18, wherein concrete plasticizers and/or water reducing agents and/or retarders are contained.

### Claim 24 (depends on 18)

The binder according to claim 18, wherein it contains from 20 to 50 wt.-% cement and from 50 to 80 wt.-% supplementary cementitious material.

### Claim 25 (depends on 20)

The binder according to claim 20, wherein it contains from 2 to 5 wt.-% calcium sulphate or a mixture of calcium sulphates.