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Method for preparing belite-sulphate aluminium cement by using coal ashes and bayer-process red mud

A technology of Belite sulfoaluminate and Bayer red mud, applied in cement production, etc., can solve problems such as high price, hazards to the ecological environment and people's lives, and ineffective utilization of industrial waste residues, so as to reduce production costs , Reduce the effect of calcining energy consumption

Active Publication Date: 2014-08-06
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, the raw materials used in the production of sulphoaluminate cement clinker are mainly bauxite, and bauxite resources are increasingly scarce and the price is high, resulting in high prices of sulphoaluminate cement, thus restricting its application and promotion
[0003] On the other hand, the national energy, metallurgy, nonferrous metals and other industries discharge a large amount of industrial solid wastes such as fly ash, slag, desulfurized gypsum, red mud, tailings and so on every year, and their comprehensive utilization rate is only about 60% (of which Bayer The comprehensive utilization rate of mud is less than 5%), which is far lower than that of developed countries such as Europe, America, Japan, etc., resulting in a large amount of industrial waste in my country still not being effectively utilized, thus causing harm to the ecological environment and people's lives

Method used

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  • Method for preparing belite-sulphate aluminium cement by using coal ashes and bayer-process red mud
  • Method for preparing belite-sulphate aluminium cement by using coal ashes and bayer-process red mud
  • Method for preparing belite-sulphate aluminium cement by using coal ashes and bayer-process red mud

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Table 1: Raw material ratio and clinker mineral composition table of embodiment 1 (wherein the percentages are mass percentages)

[0018]

[0019] The specific steps are:

[0020] (1) Put limestone, fly ash, Bayer process red mud, desulfurized gypsum and bauxite into a drying oven respectively, and after drying at 110°C for 24 hours, crush and grind them in a crusher and a ball mill to The 0.08mm sieve residue is less than 8%.

[0021] (2) Mix the raw materials obtained in step (1) according to the ratio in Table 1, put them into the mixing tank, and mix them in the mixer for 20 minutes until they are uniform. After taking them out, add water with 5% of the total mass of the raw materials, and then put Put it in the mold and press it under the hydraulic press to get the raw material test piece.

[0022] (3) Put the raw material test block obtained in step (2) into the muffle furnace, and set the temperature gradient as follows: from room temperature to 300°C, the h...

Embodiment 2

[0030] Table 3: Example 2 Raw Material Proportion and Clinker Mineral Composition Table (wherein the percentages are mass percentages)

[0031]

[0032] The specific steps are:

[0033] (1) After drying limestone, fly ash, Bayer process red mud, desulfurized gypsum and bauxite at 110°C for 24 hours, they are crushed and ground in a crusher and a ball mill respectively until the sieve residue of 0.08mm is less than 8%.

[0034] (2) Mix the raw materials obtained in step (1) according to the ratio in Table 3, put them into the mixing tank, and mix them in the mixer for 20 minutes until they are uniform. After taking them out, add water with 5% of the total mass of the raw materials, and then put Put it in the mold and press it under the hydraulic press to get the raw material test piece.

[0035] (3) Put the raw material test block obtained in step (2) into the muffle furnace, and set the temperature gradient as follows: from room temperature to 300°C, the heating rate is 1...

Embodiment 3

[0043] Table 5: Raw material ratio and clinker mineral composition table of embodiment 3 (wherein the percentages are mass percentages)

[0044]

[0045] The specific steps are:

[0046] (1) Put limestone, fly ash, Bayer process red mud, desulfurized gypsum and bauxite into a drying oven, dry at 110°C for 24 hours, then crush and grind them in a crusher and a ball mill to The 0.08mm sieve residue is less than 8%.

[0047](2) Mix the raw materials obtained in step (1) according to the ratio in Table 5, put them into the mixing tank, and mix them in the mixer for 20 minutes until they are uniform. After taking them out, add water with 5% of the total mass of the raw materials, and then put Put it in the mold and press it under the hydraulic press to get the raw material test block.

[0048] (3) Put the raw material test block obtained in step (2) into the muffle furnace, and set the temperature gradient as follows: from room temperature to 300°C, the heating rate is 10°C / h;...

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Abstract

The invention discloses a method for preparing belite-sulphate aluminium cement by using coal ashes and bayer-process red mud. The method comprises the following steps: separately crushing and grinding limestone, coal ashes, bayer-process red mud, flue gas desulfurization gypsum and bauxite and sieving; preparing raw materials according to the rate value of the clinker in which Cm is 0.95-1.0, P is 3.50-3.82 and N is 0.8-1.1, wherein the f-(SO3) content in a clinker controlled to be 1-1.5% and f-(CaO) content is controlled to be greater than -2.0%; mixing and tabletting the prepared raw materials; carrying out heat preservation at 1250-1300 DEG C for 0.5-1 hour, and then quenching to obtain the clinker; crushing the clinker and grinding the crushed clinker, gypsum and portland cement clinker together into the specification of 400+ / -10m<2> / kg and preparing into cement. The mechanical property and the setting time of the cement disclosed by the invention can meet the requirements of 425 early-strength sulphoaluminate cement, and the belite-sulphate aluminium cement is good in grindability, and has good anti-freezing and anti-permeability performances. The resource utilization rate of the coal ashes and the flue gas desulfurization gypsum can be improved by application of the technology, and especially, a new way is provided for solving comprehensive control problems of the bayer-process red mud.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a method for preparing Belite sulfoaluminate cement by using fly ash, Bayer process red mud, limestone, desulfurized gypsum and bauxite as raw materials. Background technique [0002] The sulphoaluminate series cement clinker has the characteristics of low firing temperature and low requirement of CaO, and its industrial production can reduce the energy consumption and CO2 in the cement industry to a certain extent. 2 This is of great practical significance to my country's construction of an ecologically energy-saving and environment-friendly society. But at present, the raw materials used in the production of sulphoaluminate cement clinker are mainly bauxite, and bauxite resources are increasingly scarce and the price is high, resulting in the high price of sulphoaluminate cement, thus restricting its application and promotion. [0003] On the other hand,...

Claims

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Application Information

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IPC IPC(8): C04B7/26
CPCY02P40/10
Inventor 陈平韦怀珺赵艳荣刘荣进黄小青韦家崭
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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