Method for producing high-iron sulphoaluminate cement by using red mud and aluminum ash

A high-iron sulfoaluminate and red mud technology, applied in the field of special cement, can solve the problems of large-scale equipment, human and environmental hazards, and toxic substance residues, so as to avoid scarring of the flue, improve erosion, and increase strength Effect

Inactive Publication Date: 2021-02-26
淄博海慧工程设计咨询有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technical solution not only requires dealkalization pretreatment of red mud, but also the organic wastewater concentrate is calcined together with the raw meal, which will cause some toxic substances to remain in the cement clinker, causing harm to the human body and the environment during the use of cement
[0010] In the prior art, in order to increase the mixing amount of red mud and aluminum ash in sulphoaluminate cement, it is necessary to carry out dealkalization pretreatment on red mud, or carry out high-temperature pretreatment on aluminum ash, which increases the difficulty of utilization; and wet Although the process of producing cement clinker by the traditional method can make the ingredients of the raw material mix evenly and reduce the flying of dust, it consumes a lot of energy and makes it difficult to enlarge the equipment
In addition, there is no report on the use of waste sulfuric acid for the preparation of sulphoaluminate cement

Method used

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  • Method for producing high-iron sulphoaluminate cement by using red mud and aluminum ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] (1) Pretreatment of waste sulfuric acid: after mixing 5.91 kg of calcium carbide slag with a water content of 10% and 20 kg of waste sulfuric acid with a water content of 68%, drying to a moisture content of 3 wt%, to obtain 14.6 kg of calcium sulfate-containing waste residue for use;

[0051] (2) Preparation of cement clinker: mix 5.5kg of sintering red mud, 3.5kg of secondary aluminum ash, 0.5kg of spent cathode carbon block, 2.5kg of waste residue containing calcium sulfate, and 4.5kg of limestone, and dry until the moisture content is lower than 5 wt%, ground to 80 μm sieve residue less than 10%, to obtain cement raw meal, calcined cement raw meal at 1250 ° C for 45 minutes, air cooled to 300 ° C and then naturally cooled to room temperature to obtain cement clinker;

[0052] (3) Prepare the mixture: sintering red mud was calcined at 750°C for 40 minutes and cooled rapidly to obtain modified red mud; the modified red mud and fluorogypsum were mixed at a mass ratio of...

Embodiment 2

[0055] (1) Pretreatment of waste sulfuric acid: after mixing 5.91 kg of calcium carbide slag with a water content of 10% and 20 kg of waste sulfuric acid with a water content of 68%, drying to a moisture content of 3 wt%, to obtain 14.6 kg of calcium sulfate-containing waste residue for use;

[0056] (2) Preparation of cement clinker: mix 6.0kg of Bayer process red mud, 2.5kg of secondary aluminum ash, 0.6kg of spent cathode carbon block, 2.3kg of waste residue containing calcium sulfate, and 6.5kg of limestone, and dry until the moisture content is lower than 5 wt%, ground to 80 μm sieve residue less than 10%, to obtain cement raw meal, calcined cement raw meal at 1280°C for 1 hour, air cooled to 300°C, and then naturally cooled to room temperature to obtain cement clinker;

[0057] (3) Prepare the mixture: sintering red mud was calcined at 750°C for 40 minutes and cooled rapidly to obtain modified red mud; the modified red mud and phosphogypsum were mixed at a mass ratio of 1...

Embodiment 3

[0060] (1) Preparation of cement clinker: mix 5kg sintering red mud, 3kg secondary aluminum ash, 0.5kg waste cathode carbon block, 2kg fluorogypsum, and 3kg limestone, dry until the moisture content is lower than 5wt%, and grind to 80 μm sieve The balance is less than 10% to obtain cement raw meal, calcining the cement raw meal at 1250°C for 50 minutes, air cooling to 300°C and then naturally cooling down to room temperature to obtain cement clinker;

[0061] (2) Prepare the mixture: sintering red mud was calcined at 750°C for 40 minutes and cooled rapidly to obtain modified red mud; the modified red mud, fluorogypsum, and limestone were mixed in a mass ratio of 10:3:2 to obtain mix B;

[0062] (3) Preparation of cement: mix cement clinker and mixture B at a mass ratio of 10:4, grind until the sieve residue of 80 μm is less than 10%, and obtain high iron sulfoaluminate cement.

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Abstract

The invention relates to the technical field of special cement, in particular to a method for producing high-iron sulphoaluminate cement by utilizing red mud and aluminum ash. The method for producingthe high-iron sulphoaluminate cement by utilizing the red mud and the aluminum ash comprises the following steps: mixing carbide slag and waste sulfuric acid, reacting, and drying to obtain calcium sulfate-containing waste residues; mixing red mud, secondary aluminum ash, waste cathode carbon blocks, calcium sulfate-containing waste residues and/or waste gypsum, adopting limestone as a correctionmaterial, grinding and drying to obtain a cement raw material, and calcining the cement raw material to obtain cement clinker; mixing the modified red mud and the waste gypsum to obtain a mixture A;mixing the modified red mud, waste gypsum and limestone to obtain a mixture B; and mixing the cement clinker with the mixture A or the mixture B, and grinding to obtain the high-iron sulphoaluminate cement. Waste sulfuric acid is treated and utilized while industrial solid waste is utilized, and the produced high-iron sulphoaluminate cement is high in strength, free of heavy metal dissolution andlow in cost.

Description

technical field [0001] The invention relates to the technical field of special cement, in particular to a method for producing high-iron sulfoaluminate cement by using red mud and aluminum ash. Background technique [0002] Red mud is the most important solid waste produced in alumina production. It is the solid waste left after alumina is extracted from bauxite through a series of physical and chemical reactions. Every ton of alumina produced produces about 0.8-1.6 tons of red mud. mud. At present, the annual output of domestic alumina manufacturers is about 100 million tons of red mud, and the stockpiles are about 500 million tons or more. Due to the high content of alkali in red mud, it is very difficult to utilize resources, the storage cost is high, and the environmental risk is great. [0003] Aluminum ash is the most important solid waste in the process of electrolytic aluminum and aluminum smelting. It is the scum of various additives and metal oxides added in the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/32C04B7/36
CPCC04B7/32C04B7/36
Inventor 焦占忠张凤炳赵刚李勇韩磊杨保鑫焦文帅焦伟
Owner 淄博海慧工程设计咨询有限公司
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