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Method for preparing cement mixture from sand washing sludge

A technology of mixing materials and mixing materials, applied in cement production and other directions, can solve the problems of sludge environment, occupation of land resources, etc., and achieve the effects of good economic benefits, alleviation of environmental pollution, and good 28d flexural strength

Active Publication Date: 2021-06-15
成都市嘉瑞云建材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After cleaning, the sedimentation mud produced in the sedimentation tank is the sand washing sludge. At present, most of them are stored in landfills, occupying land resources and reducing the sludge environment.

Method used

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  • Method for preparing cement mixture from sand washing sludge

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Comparison scheme
Effect test

Embodiment 1

[0023] A method for preparing cement mixture from sand washing sludge, comprising the following steps:

[0024] S1. Dry the sand washing sludge

[0025] Dry the lumpy sand washing sludge with a rotary dryer until the water content is less than 10%;

[0026] S2, batching the dried sand washing sludge and quicklime according to a mass ratio of 100:5 and mixing them uniformly to obtain a mixed material;

[0027] S3. Calcining the mixed material in the calcination equipment, the calcination system is: the heating rate is 8°C / min, the temperature is raised to 400°C, then the heat is kept for 15min, and the temperature is raised to 720°C for 30min, and it is used after natural cooling; Add 0.05% alcohol amine grinding aid and 2% activator of powder mass;

[0028] S4. Send the calcined sand washing sludge into the ball mill, and use a 45-micron square hole sieve to screen powdery materials with a specific surface area greater than 400%, and the sieve residue is less than 20%;

[0...

Embodiment 2

[0034] A method for preparing cement mixture from sand washing sludge, characterized in that: comprising the following steps:

[0035] S1. Dry the sand washing sludge

[0036] Use a dryer to dry the massive sand washing sludge until the water content is less than 10%;

[0037] S2, batching the dried sand washing sludge and quicklime according to a mass ratio of 100:10 and mixing them uniformly to obtain a mixed material;

[0038] S3. Calcining the mixed material in the calcination equipment, the calcination system is: the heating rate is 10°C / min, the temperature is raised to 400°C, and then kept for 15min, and then heated to 870°C for 30min, and it is used after natural cooling; Add 0.08% alcohol amine grinding aid and 3.5% activator of powder mass;

[0039] S4. Send the calcined sand washing sludge into the ball mill, and use a 45-micron square hole sieve to screen powdery materials with a specific surface area greater than 400%, and the sieve residue is less than 20%;

...

Embodiment 3

[0042] A method for preparing cement mixture from sand washing sludge, comprising the following steps:

[0043] S1. Dry the sand washing sludge

[0044] Use a dryer to dry the massive sand washing sludge until the water content is less than 10%;

[0045] S2, batching the dried sand washing sludge and quicklime according to a mass ratio of 100:15 and mixing them evenly to obtain a mixed material;

[0046] S3. Calcining the mixed material in the calcination equipment, the calcination system is: the heating rate is 12°C / min, the temperature is raised to 400°C, and then kept for 15min, and then heated to 900°C for 30min, and it is used after natural cooling; Add 0.1% alcohol amine grinding aid and 5% activator of powder mass;

[0047] S4. Send the calcined sand washing sludge into the ball mill, and use a 45-micron square hole sieve to screen powdery materials with a specific surface area greater than 400%, and the sieve residue is less than 20%;

[0048] S5. The powdery materi...

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Abstract

The invention discloses a method for preparing a cement mixture by using sand washing sludge. The method comprises the following steps: S1, drying blocky sand washing sludge by using a dryer until the water content is less than 10%; S2, proportioning the dried sand washing sludge and quick lime according to a mass ratio of 100: (5-15), and uniformly mixing to obtain a mixture; S3, calcining the mixture in calcining equipment according to the calcining system that the heating rate is 8-12 DEG C / min, the temperature is increased to 400 DEG C, then heat preservation is conducted for 15 min, then the temperature is increased to 700-900 DEG C and heat preservation is conducted for 30 min, and performing natural cooling for later use, wherein an alcohol amine grinding aid accounting for 0.05-0.1% of the mass of the powder and an exciting agent accounting for 2-5% of the mass of the powder are doped in the calcining process; S4, feeding the calcined sand washing sludge into a ball mill, and screening a powdery material of which the specific surface area is greater than 400% by using a 45 [mu]m square hole sieve; and S5, detecting the powdery material until the activity index is greater than 70%, thereby obtaining the cement mixture. The method not only can relieve the problem of environmental pollution, but also can bring better economic benefits.

Description

technical field [0001] The present invention relates, more specifically, to a method for preparing cement admixtures from sand washing sludge. Background technique [0002] The concrete industry has a huge demand for sand and gravel. According to the data of the National Bureau of Statistics in 2019, my country's cement production reached 2.33 billion tons. Based on this, it is estimated that the demand for sand and gravel is about 10 billion tons. In the process of mining natural sand, such as river sand and mountain sand, in order to limit the mud content in the sand to meet the requirements of concrete production, the sand should be cleaned. In addition, due to the shortage of natural sand resources, all parts of the country are vigorously developing machine-made sand. Coastal areas are rich in sea sand resources, and desalinated sea sand has gradually become an important source of raw materials for the concrete industry. Whether it is natural sand, machine-made sand or ...

Claims

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Application Information

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IPC IPC(8): C04B7/24C04B7/40C04B7/42C04B7/44C04B7/52
CPCC04B7/24C04B7/40C04B7/428C04B7/425C04B7/52C04B7/44Y02P40/10
Inventor 罗治银胡德刘红兵蒋勇
Owner 成都市嘉瑞云建材有限公司
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