Heidelberg Materials has filed a patent for a method to manufacture composite cement using calcined clay. The process involves grinding clay compounds with quartz and feldspar, separating them, calcining the clay, and mixing it with cement. This innovation aims to improve the sustainability of cement production. GlobalData’s report on Heidelberg Materials gives a 360-degree view of the company including its patenting strategy. Buy the report here.

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According to GlobalData’s company profile on Heidelberg Materials, Recycled waste cement additives was a key innovation area identified from patents. Heidelberg Materials's grant share as of January 2024 was 65%. Grant share is based on the ratio of number of grants to total number of patents.

Method for manufacturing composite cement using calcined clay

Source: United States Patent and Trademark Office (USPTO). Credit: Heidelberg Materials AG

A patent application (Publication Number: US20240010560A1) discloses a method for manufacturing a composite cement by combining cement with calcined clay. The process involves grinding a clay raw material containing clay compounds, quartz, and feldspar, classifying it into fine and coarse fractions, calcining the fine fraction to produce calcined clay, and then mixing it with the cement to create the composite cement. The clay raw material must contain at least 30 wt. % of clay compounds, quartz, and feldspar. The grinding process is carried out in various mills to achieve specific particle size distributions of the clay compounds and quartz/feldspar. The calcination of the fine fraction can be done using different methods under reducing conditions, followed by cooling.

Furthermore, the composite cement can contain 10-95 wt. % cement and 5-80 wt. % calcined clay, along with supplementary cementitious materials, admixtures, and additives. Admixtures like water reducers, plasticizers, and accelerators, as well as additives such as fillers and pigments, can be included in the composite cement. The patent also mentions the addition of limestone in a specific weight ratio with calcined clay. Different compositions of the composite cement, ranging from 30-80 wt. % cement and 10-70 wt. % calcined clay to 45-80 wt. % cement and 20-55 wt. % calcined clay, are disclosed. The method primarily focuses on using Portland cement for manufacturing the composite cement, highlighting the versatility and potential applications of the innovative process.

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GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.