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Method for preparation of dam cement by using coal mine wastes

A waste and dam technology, which is applied in the field of dam cement preparation, can solve problems such as waste of resources, and achieve the effects of energy saving, high utilization rate, and large consumption

Inactive Publication Date: 2015-10-28
山东省地质科学研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, coal gangue is generally discarded as coal waste, resulting in a serious waste of resources.

Method used

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  • Method for preparation of dam cement by using coal mine wastes
  • Method for preparation of dam cement by using coal mine wastes
  • Method for preparation of dam cement by using coal mine wastes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh the raw materials according to the weight ratio of coal gangue, lime and gypsum in the ratio of 35:58.43:6.53, add 0.1-0.3% dicalcium silicate as a crystal form stabilizer, then add 3% boric acid, and grind to a fineness of 0.08nm, add 20-30% water to form, burn to 1380°C in silicon-molybdenum furnace, keep warm for 40min, cool rapidly in the air to get dam cement clinker, then mix and grind with 5% gypsum coagulant Instantly.

Embodiment 2

[0028] Weigh the raw materials according to the weight ratio of coal gangue, lime and gypsum as 35:57.46:7.53, add 0.1-0.3% dicalcium silicate as a crystal form stabilizer, and then add 3% boric acid, grind to make the fineness 0.08nm, add 20-30% water to form, burn to 1380°C in silicon-molybdenum furnace, keep warm for 40min, cool rapidly in the air to get dam cement clinker, and then mix powder with 5% gypsum coagulant Just grind it. figure 1 is the XRD diffraction curve of the prepared clinker.

[0029] The specific test data are as follows:

[0030] The chemical composition of the clinker is shown in Table 1 (the number A2-1 is Example 1, and the number A2-2 is Example 2, the same below)

[0031] .

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Abstract

The invention provides a method for preparation of dam cement by using coal mine wastes, wherein the method includes the following steps: weighing raw materials according to the weight ratio of coal gangue to lime to gypsum of 35 to (58.43-57.46) to (6.53-7.53), adding 0.1-0.3% of dicalcium silicate as a crystal stabilizer, then adding 3% of boric acid, grinding to make the fineness be 0.08 nm, adding 20-30% of water, forming, sintering to 1380 DEG C in a silicon molybdenum furnace, carrying out heat preservation for 40 min, shock-chilling in air to obtain a dam cement clinker, and then mixing and grinding with 5% of a gypsum set-controlling admixture to obtain the dam cement. The purposes of comprehensive utilization of secondary resources and energy saving are achieved, and the method has significant economic and social benefits.

Description

technical field [0001] The invention relates to a method for preparing dam cement, in particular to a method for preparing dam cement by using coal mine waste. Background technique [0002] Dam cement refers to Portland cement that releases low heat of hydration during the hydration process and is suitable for pouring large-volume structures such as dam bodies. Dam cement is dicalcium silicate ( β -C 2 S) is the dominant mineral, and the content of tricalcium aluminate is low, so it has good workability, low heat of hydration, high late strength, high durability and other incomparable advantages of general portland cement, especially suitable for key cement Construction applications of projects such as hydraulic concrete, mass concrete, high-strength high-performance concrete, etc. This type of cement has the following characteristics: [0003] (1) The late strength is high and the strength increase rate is high. Its 28d strength is equivalent to that of general portlan...

Claims

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Application Information

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IPC IPC(8): C04B7/14
CPCY02P40/10
Inventor 魏健于学峰洪飞
Owner 山东省地质科学研究院
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