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Cement admixture prepared from tungsten tailings and application of cement admixture

A technology of tungsten tailings and mixed materials, applied in cement production and other directions, can solve problems such as limited quantity, and achieve the effects of low equipment requirements, wide sources and simple processes

Inactive Publication Date: 2014-08-13
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Domestic tungsten tailings are used to produce glass-ceramics, ceramics, unfired bricks and hollow bricks, but the quantity is very limited, and there are no relevant research reports on using it as a cement admixture

Method used

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  • Cement admixture prepared from tungsten tailings and application of cement admixture
  • Cement admixture prepared from tungsten tailings and application of cement admixture
  • Cement admixture prepared from tungsten tailings and application of cement admixture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Preparation of cement mixture from tungsten tailings, the ultra-fine processing method of tungsten tailings, the operation steps include: drying the tungsten tailings to a moisture content below 5%, grinding the ore with a cylindrical ball mill, and using steel balls as the ball milling medium , the ball-to-material ratio is 6:1, each batch of grinding is 30kg, and the particle size distribution of tungsten tailings at different ball milling times is as follows.

[0018] Table 1 Particle size distribution of tungsten tailings at different milling times

[0019]

Embodiment 2

[0021] Preparation of cement mixture with tungsten tailings, the ultra-fine processing method of tungsten tailings, the operation steps include: drying the tungsten tailings to a moisture content below 5%, performing ultra-fine processing by ball mill classification, and using corundum balls as ball milling media , ultra-fine processing test parameters are as follows.

[0022] Table 2 Test parameters of tungsten tailings products with different particle sizes

[0023] product product one product two product three Grading rotor frequency (Hz) 11.5 24 34 Productivity of finished product(kg / h) 1500 600 350 Finished particle size (D90 / μm) 30.03 17.33 8.47

Embodiment 3

[0025] For the application of cement mixture prepared from tungsten tailings, different amounts of tungsten tailings cement mixture are added to prepare different grades of cement. The formula and strength are as follows.

[0026] Table 3 Cement formula prepared by tungsten tailings cement mixture

[0027] formula Clinker (%) plaster(%) Tungsten tailings (%) quicklime(%) Tungsten tailings -400 mesh content (%) recipe one 87.5 2.5 10 0 82.88 recipe two 77.5 2.5 20 0 82.88 Recipe three 67.5 2.5 30 0 82.88 Recipe four 77.5 2.5 20 0 66.57 Recipe five 77.5 2.5 20 0 92.32 Recipe six 77.5 2.5 18 2 82.88

[0028] Table 4 Strength of cement prepared with tungsten tailings cement mixture

[0029]

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PUM

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Abstract

The invention provides a cement admixture prepared from tungsten tailings and an application of the cement admixture, and belongs to the field of comprehensive utilization of solid wastes. The cement admixture comprises the tungsten tailings and quicklime, wherein the adding amount of the quicklime accounts for 0% to 15% by the mass of the tungsten tailings; the content of garnet in the tungsten tailings is higher than 70%; the tungsten tailings are mechanically and chemically activated so as to prepare the cement admixture. A mechanical activation method comprises the following step: preparing fine powder of the tungsten tailings via a classification method in a superfine processing manner, wherein the superfine processing comprises ball milling, airflow milling or vibration milling; the classification comprises screening and air classification. A chemical activation method comprises the following step: adding a chemical excitation agent, wherein the quicklime is taken as the chemical excitation agent. The prepared cement admixture can be used for preparing different grades of silicate cement meeting the requirement of national standard. The preparation method is simple and easy to implement; the cement admixture is produced by utilizing the tungsten tailings, so that the large-scale utilization of the tungsten tailings is realized. Thus, the additional value of the tungsten tailings is greatly increased; the cement production cost is lowered. Thus, the preparation method provided by the invention has good economic and social effects.

Description

technical field [0001] The invention relates to a tungsten tailings cement mixture material and its application, belonging to the field of comprehensive utilization of solid waste. Background technique [0002] Tungsten tailings are solid wastes produced after sorting tungsten ore, and its main mineral composition is garnet. At present, it is mainly stored in tailings ponds or backfilled into mines, causing waste of resources, occupying land, polluting the environment, and endangering human health. Starting from the actual situation of tungsten tailings resources, it is of great significance to carry out research on the comprehensive utilization of tungsten tailings and realize high-value utilization of tungsten tailings to improve resource utilization and improve the ecological environment. [0003] Cement admixtures are mineral materials added to cement in the process of cement production to improve cement properties and adjust cement grades. Currently, commonly used ceme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/147
CPCY02P40/10
Inventor 杨华明彭康
Owner CENT SOUTH UNIV
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