Method for producing low-alkali cement from iron ore mining waste soil

A low-alkali cement and waste soil technology, applied in cement production, etc., can solve problems such as difficult calcination, difficult material handling, and low early strength of clinker, so as to alleviate a large number of ecological and environmental problems, improve the utilization rate of mineral resources, and reduce costs Effect

Inactive Publication Date: 2020-05-19
大冶尖峰水泥有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the bypass windproof method requires additional equipment, and the heat consumption of clinker is high, and the collected materials rich in alkali, chlorine and sulfur are difficult to handle
The second is to use low-alkali raw materials, that is, limestone with low alkali content, high-silica sandstone, shale, iron ore, etc., but the use of high-silica sandstone to produce low-alkali cement has raw materials that are difficult to grind, and clinker is calcined. Due to the lack of liquid phase minerals, especially the low aluminum content in the clinker, it is difficult to calcine, and the clinker has low early strength.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A method for producing low-alkali cement from iron ore mining waste soil, comprising the following steps:

[0028] S1. Ingredients: 88 parts of limestone, 3 parts of high-grade sandstone, 8 parts of iron ore mining waste soil, and 1 part of dust and mud are respectively pre-crushed and mixed to obtain a premix;

[0029] S2. Ball milling: add the premixed material obtained in step S1 into a ball mill for ball milling to obtain low-alkali raw meal, wherein the low-alkali raw meal is controlled at 10wt% by a square hole sieve with a fineness of 80 μm and a square hole of 200 μm The sieve residue is controlled at 0-1.5wt% composition;

[0030] S3. Calcination: calcining the low-alkali raw meal obtained in step S2: after drying the raw meal, preheating and dehydration of the preheating zone below 600°C; decomposing the carbonate in the decomposition zone between 600°C and 900°C, and entering Solid-state reaction zone between 900°C-1300°C; then rapidly raise the temperature ...

Embodiment 2

[0032] A method for producing low-alkali cement from iron ore mining waste soil, comprising the following steps:

[0033] S1. Ingredients: 89 parts of limestone, 5 parts of high-grade sandstone, 4 parts of low-grade sandstone, and 2 parts of dust and mud are respectively pre-crushed and mixed to obtain a premix;

[0034] S2. Ball milling: add the premixed material obtained in step S1 into a ball mill for ball milling to obtain low-alkali raw meal, wherein the low-alkali raw meal is controlled at 10wt% by a square hole sieve with a fineness of 80 μm and a square hole of 200 μm The sieve residue is controlled at 0-1.5wt% composition;

[0035] S3. Calcination: calcining the low-alkali raw meal obtained in step S2: after drying the raw meal, heating and dehydrating the preheating zone below 600°C; decomposing the carbonate in the decomposition zone between 600°C and 900°C, and entering 900°C Solid-state reaction zone between -1300°C; then rapidly raise the temperature to 1350-145...

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PUM

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Abstract

The invention discloses a method for producing low-alkali cement from iron ore mining waste soil, belonging to the technical field of cement preparation. Aiming at the problem of high cost of raw materials for producing low-alkali cement in the prior art, the invention provides the following scheme: the low-alkali cement is prepared from, in parts by weight, 85-89 parts of limestone, 3-10 parts ofsandstone, 0-8 parts of iron ore mining waste soil and 1-3 parts of an iron correction material through batching, ball milling and calcining. The iron ore mining waste soil is used as a raw materialfor producing the low-alkali cement, and the qualified low-alkali cement is prepared, so a large amount of the iron ore mining waste soil is recycled, the waste is turned into wealth, the utilizationrate of mineral resources is increased, considerable ecological environment problems caused by stockpiling of the iron ore mining waste soil are effectively relieved, and great promotion effects are achieved on energy saving and environmental protection strengthening; and the method is low in cost, low in energy consumption and beneficial for increasing the yield of the low-alkali cement.

Description

technical field [0001] The invention relates to the technical field of cement preparation, in particular to a method for producing low-alkali cement from iron ore mining waste soil. Background technique [0002] Low-alkali cement means that the content of potassium oxide and sodium oxide in cement does not exceed 0.6% based on equivalent sodium oxide. The use of low-alkali cement is one of the main ways to prevent alkali-aggregate reaction in concrete. The use of low-alkali cement can effectively avoid the cracking and collapse of the cement concrete body. The production of low-alkali cement is mainly through two ways: one is bypass ventilation, the alkali circulating in the cement kiln is discharged out of the kiln through bypass ventilation before it is condensed, and the alkali content in the kiln is reduced. However, the bypass windproof method requires additional equipment, and the heat consumption of clinker is high, and the collected materials rich in alkali, chlori...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/14C04B7/36C04B7/44
CPCC04B7/14C04B7/36C04B7/44Y02P40/10
Inventor 范良武
Owner 大冶尖峰水泥有限公司
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