A low-carbon portland cement clinker and a method for preparing the same

By using industrial solid waste such as copper smelting sludge to replace cement raw materials, and combining it with carbonaceous reducing agents to lower the calcination temperature, the problems of high carbon emissions and heavy metal pollution of silicate cement clinker have been solved, realizing low-carbon and environmentally friendly cement production and high-strength cement clinker preparation.

CN117466555BActive Publication Date: 2026-04-21JIANGXI BUILDING MATERIALS RES & DESIGN INST CO LTD
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Patent Information

Application Number
CN202311417602.2
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-10-30
Publication Date
2026-04-21
Estimated Expiration
2043-10-30

AI Technical Summary

Technical Problem

In existing technologies, the carbon dioxide emissions during the calcination of silicate cement clinker are high, and copper smelting sludge is not effectively utilized, resulting in environmental pollution and resource waste.

Method used

By using industrial solid waste such as copper smelting sludge, sandstone, coal gangue, and iron tailings to replace traditional cement raw materials, and combining them with carbonaceous reducing agents, the calcination temperature is lowered and calcium oxide formation is promoted, thereby reducing carbon dioxide emissions and solidifying heavy metals.

Benefits of technology

The calcination temperature of silicate cement clinker was reduced, carbon dioxide emissions were reduced by more than 20%, achieving efficient resource utilization and environmental protection. The cement strength reached 45MPa to 55MPa, and the heavy metal curing effect was significant.

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Abstract

This application relates to the field of building materials and discloses a low-carbon silicate cement clinker and its preparation method. The low-carbon silicate cement clinker, by weight, comprises the following components: copper smelting sludge, limestone, sandstone, coal gangue, iron tailings, and a carbonaceous reducing agent. On one hand, the firing temperature of this invention is 50-100°C lower than the conventional silicate cement clinker firing temperature of 1450°C, reducing coal consumption without affecting the quality of the silicate cement clinker. On the other hand, the cement clinker prepared by this invention can consume a large amount of copper smelting sludge. Through high-temperature firing, it can effectively solidify the heavy metal elements in the copper smelting sludge, and utilize the non-carbonate calcareous materials in the copper smelting sludge to replace part of the limestone, significantly reducing carbon dioxide emissions. Simultaneously, it can achieve resource utilization of various industrial waste residues, which has significant economic, low-carbon, and environmental benefits.
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