Phlego cement from a new earth-inspired clinker

Patent metadata

Field	Value
Publication number	US-12319630-B2
Application number	US-202017781864-A
Country	US
Kind code	B2
Filing date	Dec 4, 2020
Priority date	Dec 6, 2019
Publication date	Jun 3, 2025
Grant date	Jun 3, 2025

Abstract

Improved cement for concrete is provided having reduced carbon footprint and improved mechanical properties. A limestone-free process of making the clinker provides a 70% reduction of carbon footprint vs. conventional manufacture of Portland cement. Curing the resulting cement in a temperature range from 80° C. to 100° C. advantageously enhances growth of fibrous minerals in the concrete.

First claim

The invention claimed is:

1. A method of making a clinker for use in cement production, the method comprising:
providing raw meal including silica, aluminum oxide, alkali oxides, calcium oxide and sulfur oxide;
wherein a weight fraction of silica in the raw meal is between 40% and 60%;
wherein a weight fraction of the aluminum oxide in the raw meal is between 10% and 25%;
wherein a weight fraction of the alkali metal oxides in the raw meal is between 5% and 15%;
wherein a weight fraction of the calcium oxide in the raw meal is between 5% and 15%;
wherein a weight fraction of the sulfur oxide in the raw meal is between 0.5% and 2%;
wherein a weight fraction of carbon-containing chemical species in the raw meal is less than 1%;
firing the raw meal to provide the clinker.

2. The method of claim 1 , wherein the firing the raw meal to provide the clinker is performed in a temperature range from 900° C. to 1200° C.

3. A method of forming concrete, the method comprising:
performing the method of claim 1 to provide a clinker;
slaking the clinker to provide a slurry;
curing the slurry in a temperature range from 80° C. to 100° C. to promote the growth of fibrous minerals.

Assignees

• Univ Leland Stanford Junior

Inventors

• Vanorio Tiziana

Classifications

• C04B28/18

  containing mixtures of the silica-lime type · CPC title

• C04B28/006

  containing mineral polymers, e.g. geopolymers of the Davidovits type · CPC title

• C04B12/005

  Geopolymer cements, e.g. reaction products of aluminosilicates with alkali metal hydroxides or silicates · CPC title

• C04B7/367

  Avoiding or minimising carbon dioxide emissions · CPC title

• Y02P40/18

  Carbon capture and storage [CCS] · CPC title