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Vanadium tailings and cement blended material and preparation method and application thereof

A technology of cement admixture and vanadium tailings, applied in cement production, etc., can solve the problem that the activity of tailings is difficult to be fully exerted, and achieve the effect of low price, simple preparation method, and increased added value

Inactive Publication Date: 2018-11-27
中煤地质集团有限公司北京生态环境分公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the single use of a certain activation method has limitations in stimulating the activity of tailings, and it is difficult to fully exert the activity of tailings.

Method used

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  • Vanadium tailings and cement blended material and preparation method and application thereof
  • Vanadium tailings and cement blended material and preparation method and application thereof

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preparation example Construction

[0031] The invention discloses a preparation method of vanadium tailings cement admixture, comprising the following steps:

[0032] Step 1. Dry the calcium carbide slag, and use a powder classifier to screen the powder with a specific surface area greater than 400m 2 / kg and less than 400m 2 / kg of calcium carbide slag powder;

[0033] Among them, the chemical composition of calcium carbide slag is calculated as: SiO 2 2%~4%, Al 2 o 3 1.5%~2.5%, CaO 70%~72%, Fe 2 o 3 +FeO 0.2%~0.6%, SO 2 0.3%~0.6%, K 2 O 0.10%~0.18%, Na 2 O0.25%~0.30%, loss on ignition 22.00-22.30%.

[0034] Step 2, will be greater than 400m 2 / kg of calcium carbide slag powder, vanadium tailings and coal slag are mixed and calcined at high temperature. The mass ratio of coal slag to the total amount of vanadium tailings after high temperature calcination is 5:95~15:85; the high temperature calcination temperature is 600~1000℃ , the high temperature calcination time is 0.5~3hh;

[0035] Wherein, th...

Embodiment 1

[0045] Dry the calcium carbide slag, and select the powder with a specific surface area greater than 400m3 with a powder separator 2 / kg and less than 400m 2 / kg of calcium carbide slag powder; will be greater than 400m 2 / kg calcium carbide slag powder mixed with vanadium tailings and coal slag and then calcined at high temperature, the mass ratio of coal slag to the total amount of vanadium tailings after high temperature calcination is 10:90, the high temperature calcination temperature is 750°C, and the high temperature calcination time is 1h ; Its SiO of the selected vanadium tailings of present embodiment 1 2 The content is 64.3%. The calcined powder is ground for 40 minutes with an SM 500mm×500mm cement mill to obtain a ground premix; the aerated concrete waste is dried at a temperature of 40-70°C, and then ground to 450m 2 / kg; will be less than 400m 2 / kg calcium carbide slag powder and dried aerated concrete waste were added to the premix, and SM 500mm×500mm cem...

Embodiment 2

[0051] Dry the calcium carbide slag, and select the powder with a specific surface area greater than 400m3 with a powder separator 2 / kg and less than 400m 2 / kg of calcium carbide slag powder; will be greater than 400m 2 / kg calcium carbide slag powder mixed with vanadium tailings and coal slag and then calcined at high temperature, the mass ratio of coal slag to the total amount of vanadium tailings after high temperature calcining is 5:95; the high temperature calcining temperature is 500°C, and the high temperature calcining time is 3h ; Its SiO of the selected vanadium tailings of present embodiment 2 2 The content is 64.3%. Grind the calcined powder with SM 500mm×500mm cement mill for 50 minutes to obtain the ground premix; dry the aerated concrete waste at 40°C, and then grind it to 300m 2 / kg; will be less than 400m 2 / kg calcium carbide slag powder and dried aerated concrete waste were added to the premix, and SM 500mm×500mm cement mill was used for grinding for 5...

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Abstract

The invention discloses a vanadium tailings and cement blended material and a preparation method and application thereof. The preparation method comprises the following steps: drying carbide slag, andsorting out carbide slag powder of which the specific surface area is greater than 400 m<2> / kg and carbide slag powder of which the specific surface area is smaller than 400 m<2> / kg by using a powdersorting machine; mixing the carbide slag powder of which the specific surface area is greater than 400 m<2> / kg with vanadium tailings and coal slag, and carrying out high-temperature calcination; grinding the calcined powder to obtain ground premix; breaking aerated concrete wastes into materials of which the granularity is smaller than 10 mm, then drying until the water is smaller than 1%, and then grinding the materials; adding the carbide slag powder of which the specific surface area is smaller than 400 m<2> / kg and the dried aerated concrete wastes in the premix and grinding the mixture to obtain the vanadium tailings and cement blended material. The prepared mineral blended material can be used in industrial production of cement. The preparation method is simple and feasible, large-scale utilization of the vanadium tailings can be realized, the additional value of the vanadium tailings is increased, the production cost for the cement is reduced, and the economic effect and the social effect are good.

Description

technical field [0001] The invention belongs to the technical field of building material preparation, and in particular relates to a vanadium tailings cement admixture and a preparation method and application thereof. Background technique [0002] Most of the vanadium tailings belong to tailings with high silicon content (usually considered as SiO 2 Content ≥ 60% high silicon type tailings, SiO 2 content <60% is low-silicon tailings), the main mineral composition of this type of tailings is mainly quartz, with a small amount of feldspar, gypsum and pyrite and other minerals. Vanadium tailings are mostly disposed of in the form of stockpiling or filling, which not only fails to exert its economic value, but also brings a series of social and environmental problems to the society. [0003] SiO in vanadium tailings 2 The content is relatively high, mainly in the form of quartz. It can be used as a siliceous material in the preparation of building materials. For undistur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/28C04B7/24C04B7/38C04B7/43
CPCC04B7/24C04B7/28C04B7/38C04B7/432Y02P40/10
Inventor 王长龙石中勇常永智左伟何丽丽周小利王双杰刘振宇靳倡智钱伟常宁吝晓然张凯帆霍泽坤
Owner 中煤地质集团有限公司北京生态环境分公司
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