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Method for preparing composite type iron ore pellet adhesive by utilizing landfill leachate

Active Publication Date: 2017-05-31
FUZHOU UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] With the development of our country's social economy and the acceleration of urbanization, the amount of urban garbage in our country has increased extremely rapidly. In the process of processing many urban domestic garbage, a large amount of garbage is stacked in the open air or landfilled. It not only takes up a lot of land, but also is easy to Soil, groundwater, and atmosphere cause great secondary pollution, becoming a serious environmental problem

Method used

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  • Method for preparing composite type iron ore pellet adhesive by utilizing landfill leachate

Examples

Experimental program
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Effect test

Embodiment 1

[0021] A kind of method utilizing landfill leachate to prepare composite iron ore pellet binder:

[0022] 100Kg of landfill leachate concentrate with a solid content of 30% and 6Kg of a sodium hydroxide solution with a concentration of 3mol / L were mixed and evenly mixed, and stirred and reacted in a water bath at 80°C for 0.5h, and then the solution was cooled. The modified landfill leachate can be prepared. Mix 40 parts of the modified landfill leachate with 25 parts of cement and 6 parts of quicklime evenly, then add it to the spray drying equipment, and spray dry it at 160°C. Composite iron ore pellet binder can be prepared.

[0023] The composite iron ore pellet binder prepared in this example was added to the iron concentrate by 2% of the mass of the iron ore concentrate to prepare iron ore pellets.

Embodiment 2

[0025] A kind of method utilizing landfill leachate to prepare composite iron ore pellet binder:

[0026] Mix 100Kg of landfill leachate concentrate with a solid content of 35% and 10Kg of a sodium hydroxide solution with a concentration of 3mol / L, and stir and react for 1 hour in a water bath at 85°C, then cool the solution to obtain Modified landfill leachate can be prepared. Mix 40 parts of modified landfill leachate with 25 parts of cement and 6 parts of quicklime evenly, then add it to the spray drying equipment, and spray dry it at 180°C. A composite iron ore pellet binder is prepared.

[0027] The composite iron ore pellet binder prepared in this example was added to the iron concentrate by 2% of the mass of the iron ore concentrate to prepare iron ore pellets.

Embodiment 3

[0029] A kind of method utilizing landfill leachate to prepare composite iron ore pellet binder:

[0030] 100Kg of landfill leachate concentrate with a solid content of 40% was mixed with 6Kg of a sodium hydroxide solution with a concentration of 3mol / L, and stirred and reacted in a water bath at 90°C for 1.5h, and then the solution was cooled. The modified landfill leachate can be prepared. Mix 50 parts of the modified landfill leachate with 30 parts of cement and 12 parts of quicklime evenly, then add it to the spray drying equipment, and spray dry it at 200°C. Composite iron ore pellet binder can be prepared.

[0031] The composite iron ore pellet binder prepared in this example was added to the iron concentrate by 2% of the mass of the iron ore concentrate to prepare iron ore pellets.

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Abstract

The invention discloses a method for preparing a composite type iron ore pellet adhesive by utilizing a landfill leachate. A landfill leachate concentrated solution with the solid content being 30-40% is evenly mixed with a sodium hydroxide solution, and after the stirring reaction is conducted under the water-bath condition of 80-90 DEG C, a solution is cooled, and then a modified landfill leachate can be prepared; and the prepared modified landfill leachate is evenly mixed with cement and calcium oxide in proportion, and after spray drying, the composite type iron ore pellet adhesive is prepared. By means of the methods that the landfill leachate concentrated solution and sodium hydroxide are subjected to mixing modification, and then the composite type iron ore pellet adhesive is prepared by mixing the modified landfill leachate with the cement and the calcium oxide in proportion, the method is simple, and operation is practicable; and the adhesive is prepared from the landfill treatment leachate produced in the landfilling process, so that recycling of waste resources is achieved, and the method has great significance on sustainable development and utilization of energy sources.

Description

technical field [0001] The invention relates to the field of iron ore pellet additives, in particular to a method for preparing a composite iron ore pellet binder by utilizing landfill leachate. Background technique [0002] Pellets have the advantages of uniform particle size, high cold strength, high iron grade, and good reducibility. Achieving environmental friendliness has played an obvious positive role. [0003] Binder is an indispensable additive in the process of iron ore pellet processing. Studies have shown that a binder with good performance has very obvious practical significance for improving the quality of pellets and the economic and technical indicators of ironmaking. With the vigorous development of iron ore pellets, the quality requirements for binders are getting higher and higher, and the role of binders in the production of iron ore pellets is becoming more and more important. So far, the binders that have been used for iron ore pellets at home and abr...

Claims

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Application Information

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IPC IPC(8): C22B1/243C22B1/242
CPCC22B1/242C22B1/243
Inventor 刘明华蔡明亮刘以凡杨桂芳李晓泉
Owner FUZHOU UNIVERSITY
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