A method of using tailings powder to improve cement workability

A technology for tailings powder and cement, applied in the field of cement processing, can solve the problems affecting the durability and corrosion resistance of concrete, unreasonable mixing ratio of mixed materials, fine cracks in concrete, etc., and achieves favorable workability and cohesion. , The effect of reducing small cracks and stable compressive strength

Active Publication Date: 2022-04-19
广西河池国投鱼峰水泥有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In addition, the unreasonableness of the traditional method for particle size distribution of materials
The average value of ordinary cement less than 3 μm is about 24%. Since the time used to produce ordinary cement is relatively low, and it belongs to open-circuit mill, the phenomenon of over-grinding in open-circuit mill cement is serious, and there are too many particles smaller than 3 μm. Large water demand and high shrinkage rate will easily cause small cracks in concrete, which will seriously affect the durability and corrosion resistance of concrete; and the particles in the range of 3-32μm play a major role in the strength of cement, and the higher the content, the more conducive To improve the strength of cement, it is necessary to increase the particle content of cement in this range
[0005] Therefore, the existing cement processing methods have defects such as unreasonable mill gradation and unreasonable mixing ratio of mixed materials. It is necessary to study a method of using tailings powder to improve cement workability.

Method used

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  • A method of using tailings powder to improve cement workability
  • A method of using tailings powder to improve cement workability
  • A method of using tailings powder to improve cement workability

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1. Test the compressive strength of cement with different tailings powder mixed with ordinary cement. The test results are shown in Table 1.

[0022] Table 1

[0023]

[0024] It can be seen from Table 1 that after the ordinary cement is mixed with different proportions of tailings powder, as the amount of tailings powder added increases, the 3-day strength decline trend is more obvious, especially when the tailings powder mixed with more than 5.0% , the decline increased; the 28-day intensity decreased less. When the tailings powder content is 5.0%, the 3-day strength decreases by about 2.6MPa, but it is still higher than the national standard of 4.4MPa (3-day compressive strength ≥ 21MPa), which has a good effect.

[0025] 2. Test the compressive strength of cement with different proportions of the material particle size in ordinary cement. The test results are shown in Table 2.

[0026] Table 2

[0027]

[0028] It can be seen from Table 2 that the best effe...

Embodiment 2

[0038] 1. Adjust the grinding equipment parameters:

[0039] Adjust the gradation of the mill; make the ratio of the average ball diameter of the mill to the diameter of the material entering the mill be 20:1; select the lining plate and the discharge grate plate according to the specifications of the grinding body in the fine grinding chamber, so that the gap between the grinding tail grate plate is ≤8mm; Regularly clean the granular material on the grate plate every 20 days to ensure the normal function of ventilation and feeding; optimize the process parameters of ventilation in the mill and V-selection speed, control the frequency of the V-selection speed inverter at 13Hz, and adjust the frequency conversion of the exhaust fan at the end of the mill tor frequency at 35Hz.

Embodiment 3

[0041] Prepare clinker and adjust the parameters of the clinker calcination process:

[0042] (1) Increase the calcination temperature: the fuel coal powder is ground to a fineness of 0.08 mm and the sieve residue is lower than 10%. %, calorific value is 25000kj / kg;

[0043] (2) Improve the stability of coal ash entering the kiln: each shift takes a sample on the coal conveyor belt every 30 minutes to check the industrial analysis of coal, grasp the situation of coal ash in time, and ensure the stability of coal ash entering the kiln;

[0044] (3) Improve the thermal system: set the secondary air temperature to 1100°C, ensure that the free calcium of the clinker is 1.1%, the vertical lift weight is not less than 1200g / L, and set the clinker temperature of the grate cooler to 90°C; The clinker calcining temperature is not lower than 1450° C., and the calcining time is 30 minutes.

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Abstract

The invention discloses a method for improving the workability of cement by using tailings powder, which belongs to the technical field of cement processing. The weight percentage content of each component in the cement is: tailings powder 4.5-6%, limestone 7-8%, Non-ferrous metal ash 6-7%, desulfurized gypsum 4-5%, clinker 75-77%, and then through grinding to control the content of particles in the material, optimize the clinker firing temperature and process, and fine processing parameters can be obtained. The workability, fluidity and cohesion of cement can be improved, and the obtained cement product meets the requirements of national standards and has high quality.

Description

technical field [0001] The invention relates to the technical field of cement processing, in particular to a method for improving cement workability by using tailings powder. Background technique [0002] Tailings slag is a by-product of the metal industry. It is generally discharged from the concentrator in the form of slurry with a particle size of 0.001-1 mm. After drying, it is easy to raise dust and pollute the air environment. In the cement industry, the most commonly used Portland cement clinker is mainly composed of calcium oxide, silicon dioxide and a small amount of aluminum oxide and iron oxide. The main mineral composition is tricalcium silicate, dicalcium silicate, tricalcium aluminate and tetracalcium aluminoferrite. Portland cement clinker and appropriate amount of gypsum are ground together to form Portland cement. [0003] In the traditional method, due to the unreasonable gradation of cement particles, the proportion of cement particles smaller than 3 mic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/24C04B7/19C04B7/44C04B7/52
CPCC04B7/24C04B7/19C04B7/44C04B7/4407C04B7/52Y02P40/10
Inventor 蒋林海梁茂华韦剑宁唐小春谭云军罗海波唐文胜黄丽霖韦昭井钟善彬黄耀业封柱文
Owner 广西河池国投鱼峰水泥有限公司
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