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Handling method for using aluminum sulfate slag as cement ingredient

A technology of aluminum sulfate slag and treatment method, applied in the direction of cement production and the like, can solve the problems of reducing cement hydration capacity, reducing cost, and reducing production efficiency, so as to overcome energy consumption, reduce production efficiency, and improve cement Gel properties, the effect of reducing the cost of cement

Inactive Publication Date: 2007-09-26
谭纪林
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Aluminum sulfate slag is the waste residue discharged from the production of aluminum sulfate by sulfuric acid treatment of minerals containing high alumina, such as bauxite, in chemical plants. It contains about 15% Al 2 o 3 , around 10% SO 3 , mostly SiO 2 And a small part of other oxides, the pH value is less than 6, and the water content is about 40%. It is difficult to develop and utilize, and it can only be treated as waste residue. It has been piled up like a mountain for a long time, occupying a lot of land, and the waste liquid leaks after raining, polluting a lot of farmland , causing serious pollution to the environment, is one of the main hazards of chemical plants
In order to turn waste into wealth and eliminate public hazards, many people have thought of many ways, and some of them have tried to mix it into cement as cement ingredients. The method is mainly to use aluminum sulfate slag as a raw material in cement raw materials or It can be directly mixed into cement clinker for use. When aluminum sulfate slag is used as a raw material in cement raw meal, it needs to be roasted in a cement kiln to a high temperature of about 1500°C before it can be sintered into cement clinker, so that the energy Consumption increases and production efficiency decreases, so it has little effect on reducing costs, and few people use it in actual production
The idea of ​​directly mixing aluminum sulfate slag into cement clinker is also difficult to realize in actual production, because aluminum sulfate slag is the waste residue discharged from the production of aluminum sulfate by chemical plants using sulfuric acid to treat minerals containing high alumina, such as bauxite , which contains around 15% Al 2 o 3 , About 10% SO 3 , mostly SiO 2 And a small part of other oxides, the pH value is less than 6, and the water content is about 40%. If it is directly mixed into the cement clinker, the clinker will be hydrated in advance, which will reduce the hydration capacity of the cement later, and the grinding material will be damp. It affects the output of the mill, so it has no practical value
In summary, so far, aluminum sulfate slag has not been widely used as cement ingredients

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The parts by weight are: 2 parts of aluminum sulfate slag, 1.5 parts of acetylene gas slag, 1.5 parts of fly ash and an appropriate amount of water to make a 6 × 12 × 24 cm block, and then dry it naturally to form a green block; Put it in a kiln for roasting, when the roasting temperature reaches 620°C, cool it out of the kiln, and grind it into powder into aluminum sulfate slag product. The aluminum sulfate slag product is mixed in a certain proportion and used to replace the commercial slag cement as the cementitious material and the commercial slag cement as the cementitious material, and the physical properties such as strength and wear resistance are tested according to the relevant ISO cement physical property test standards, (ie The ratio of mortar to sand is 1:3, the ratio of water to cement is 0.5, 450 grams of cementitious material can be used, 1350 grams of standard sand, the size of the test block is 4×4×16cm, and each composition is 3 pieces, demoulding, cur...

Embodiment 2

[0017] The parts by weight are: 3 parts of aluminum sulfate slag, 1 part of acetylene gas slag, 1 part of fly ash and an appropriate amount of water to make a 8 × 16 × 30cm block, and then dry it naturally to form a green block; Put it in a kiln for roasting, when the roasting temperature reaches 320°C, cool it out of the kiln, take the processed aluminum sulfate slag as 1 part and cement clinker plus gypsum as 1 part, mix and grind it into powder according to the weight ratio, referred to as mixed powder, Then mix it with commercial slag powder to form a cementitious material, and compare the performance with commercial ordinary cement and road cement according to the ISO relevant cement physical performance test standards. The results are shown in Table 2.

[0018] Preface

[0019] It can be seen from Table 2 that the anti-wear performance, flexural strength and compressive strength of the existing commercial slag powder mixed with a certain proportion of aluminum s...

Embodiment 3

[0021] The parts by weight are: 1.5 parts of aluminum sulfate slag, 1.5 parts of acetylene gas slag, 2 parts of fly ash and an appropriate amount of water to make a 10 × 16 × 30cm compact, and then dry it naturally to form a green compact; Put it in a kiln for roasting, when the roasting temperature is 450°C, cool it out of the kiln, and grind it into powder to be aluminum sulfate slag product. The aluminum sulfate slag product is mixed in a certain proportion and used to replace the pure clinker cement as the cementitious material and the pure clinker cement as the cementitious material. The physical properties such as strength and wear resistance are tested and compared according to the ISO relevant cement physical property test standards. The result example is in Table 3.

[0022]

Preface

Sample weight (g)

Loss after abrasion

Weight (g)

Flexural strength (mpa)

Compressive strength (mpa)

No

...

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PUM

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Abstract

The invention discloses a disposing method to supply aluminum sulfate slag as cement dosage, which comprises the following steps: mixing aluminum sulfate slag and acetylene gas slag and coal ash as finite ratio; producing blank independently; disposing mature blank block with high-temperature roasting steps; grinding into powder separately; using to cement or concrete; or grinding mature blank block and cement clinker to cement. This invention is a good disposing method, which can improve the antiwear property of cement markedly.

Description

technical field [0001] The present invention relates to a waste slag treatment method, especially a kind of harmless treatment for the aluminum sulfate slag discharged from the production of aluminum sulfate by sulfuric acid treatment of minerals containing high alumina such as bauxite in chemical plants and used as cement ingredients. The method belongs to the field of environmental protection or cement. Background technique [0002] Aluminum sulfate slag is the waste residue discharged from the production of aluminum sulfate by sulfuric acid treatment of minerals containing high alumina, such as bauxite, in chemical plants. It contains about 15% Al 2 o 3 , around 10% SO 3 , mostly SiO 2 And a small part of other oxides, the pH value is less than 6, and the water content is about 40%. It is difficult to develop and utilize, and it can only be treated as waste residue. It has been piled up like a mountain for a long time, occupying a lot of land, and the waste liquid leak...

Claims

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Application Information

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IPC IPC(8): C04B7/38C04B7/44C04B7/52C04B7/147C04B7/26C04B7/32
CPCC04B2111/00017C04B7/14Y02P40/10C04B7/26C04B7/52
Inventor 谭纪林
Owner 谭纪林
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