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A method for preparing copper tailings foam concrete by wet grinding and foaming

A technology of foam concrete and copper tailings, which is applied in the field of building materials, can solve the problems of reducing the mechanical properties and durability of foam building materials, complicated activation procedures, and cumbersome foaming processes, so as to improve hydration activity, solve accumulation problems and Harm, resource and energy saving effects

Active Publication Date: 2022-06-21
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This traditional foaming method generally requires the use of a foaming agent and a foam stabilizer prepared from a variety of raw materials, and some additional surfactants are required, the ratio is complicated, and the foaming process is cumbersome; The composition of the bubbles in the liquid is stabilized by surface activity, and the wet foam is in a non-equilibrium state, with poor stability and easy to reduce the mechanical properties and durability of foamed building materials.
In addition, the treatment of tailings needs to be improved. The process of using high temperature or alkali excitation to increase the activity is complicated, and the use of ordinary grinding to reduce the particle size has low efficiency and high energy consumption.

Method used

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  • A method for preparing copper tailings foam concrete by wet grinding and foaming
  • A method for preparing copper tailings foam concrete by wet grinding and foaming

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The method for preparing copper tailings foamed concrete in this embodiment comprises the following steps in turn:

[0030] (1) uniformly mixing the copper tailings raw material with water to obtain a mixture with a solid content of 10%, sending it into a wet ball mill, adding grinding media to grind until the particle size of the copper tailings is 1000nm, and taking out the grinding media by sieving, The copper tailings foam mixed slurry was obtained, and according to the foam concrete standard JC / T 266-2011 test method, foam samples were taken to measure the expansion ratio, settlement distance, and bleeding amount.

[0031] Adopt following wet milling process parameter in the step (1):

[0032] The grinding medium is zirconia grinding balls with a particle size of 0.2-1.0mm, the filling rate of the grinding medium is 70% by volume, the weight ratio of the ball to material is 1:2, the stirring shaft speed of the wet mill is 400r / min, and the grinding time is 3h.

[...

Embodiment 2

[0036] The method for preparing copper tailings foamed concrete in this embodiment comprises the following steps in turn:

[0037] (1) uniformly mixing the copper tailings raw material with water to obtain a mixture with a solid content of 30%, sending it into a wet ball mill, adding grinding media to grind until the particle size of the copper tailings is 700nm, and taking out the grinding media by sieving, The copper tailings foam mixed slurry was obtained, and according to the foam concrete standard JC / T 266-2011 test method, foam samples were taken to measure the expansion ratio, settlement distance, and bleeding amount.

[0038] Adopt following wet milling process parameter in the step (1):

[0039]The grinding medium is zirconia grinding balls with a particle size of 0.2-1.0mm, the filling rate of the grinding medium is 70% by volume, the weight ratio of the ball to material is 1:2, the stirring shaft speed of the wet mill is 500r / min, and the grinding time is 4h.

[00...

Embodiment 3

[0043] The method for preparing copper tailings foamed concrete in this embodiment comprises the following steps in turn:

[0044] (1) uniformly mixing the copper tailings raw material with water to obtain a mixture with a solid content of 50%, sending it into a wet ball mill, adding grinding media to grind until the particle size of the copper tailings is 400nm, and sieving and taking out the grinding media, The copper tailings foam mixed slurry was obtained, and according to the foam concrete standard JC / T 266-2011 test method, foam samples were taken to measure the expansion ratio, settlement distance, and bleeding amount.

[0045] Adopt following wet milling process parameter in the step (1):

[0046] The grinding medium is zirconia grinding balls with a particle size of 0.2-1.0mm, the filling rate of the grinding medium is 70% by volume, the weight ratio of the ball to material is 1:2, the stirring shaft speed of the wet mill is 600r / min, and the grinding time is 5h.

[...

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Abstract

The invention provides a method for preparing copper tailings foam concrete by wet grinding and foaming. After mixing the copper tailings raw ore and water in a certain proportion, sending it into a wet ball mill, adding a grinding medium to fully grind it, and screening to obtain a large amount of Copper tailings slurry of nano-stabilized foam; according to the common ratio of ordinary foam concrete, the foam slurry, cement, aggregate, admixture, admixture and water are quickly mixed and stirred to obtain foam concrete slurry, which is loaded into For the mould, lightly vibrate and scrape the surface, and then remove the mold after natural curing. This method wet-grinds copper tailings particles to the nanometer level to make the slurry bubble, and produces a large number of particle-stable foams with uniform distribution and low density. It can not only replace chemical foaming agents and foam stabilizers at the same time, the process is flexible and simple, and the effect is good. Moreover, the activity of solid waste copper tailings is greatly improved, and its efficient application in cement concrete is realized.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a method for preparing copper tailings foam concrete by wet grinding and foaming. Background technique [0002] Foamed concrete has the characteristics of light weight, good heat and sound insulation, good thermal insulation performance, energy saving and environmental protection, and is currently widely used in the fields of external wall insulation and wall filling. However, in actual engineering, due to the instability of the foam, the internal pore size distribution of the foamed concrete is often uneven, the mechanical properties are not high, and even the phenomenon of mold collapse occurs at low density. Therefore, preparing uniform and stable foam is an effective way to improve the comprehensive performance of foam concrete. [0003] Copper tailings, also known as copper tailings, are powdery or gritty solid wastes left after natural copper ore has...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00C04B38/10C04B20/02C04B18/12C04B111/52
CPCC04B28/00C04B38/106C04B20/026C04B2111/52C04B2201/50C04B14/068C04B18/12C04B2103/302C04B18/08C04B18/142Y02W30/91
Inventor 贺行洋马庆红罗灿郑正旗杨进王迎斌吴磊赵浩祥李韦龙李承昊史虎雄
Owner HUBEI UNIV OF TECH