A kind of method that utilizes aluminum ash and carbide slag to prepare calcium aluminate

A technology of calcium carbide slag and calcium aluminate, which is applied in the preparation of calcium aluminate, alkaline earth metal aluminate/alumina/aluminum hydroxide, etc.

Active Publication Date: 2020-06-09
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method not only solves the problem of safe disposal and resource utilization of aluminum ash and carbide slag, but also realizes the synergistic utilization of aluminum ash and carbide slag

Method used

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  • A kind of method that utilizes aluminum ash and carbide slag to prepare calcium aluminate
  • A kind of method that utilizes aluminum ash and carbide slag to prepare calcium aluminate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The aluminum ash is treated according to the process of catalytic hydrolysis-acidolysis-washing. The catalytic hydrolysis section: the liquid-solid ratio is 2ml / g, the reaction temperature is 70°C, the reaction time is 1h, and the cycle times of the hydrolyzate is 3 times; the acidolysis section: the liquid-solid ratio is 3ml / g, reaction temperature 80℃, reaction time 1h, hydrochloric acid concentration 100g / l; sintering section: molding pressure 20MPa, calcination temperature 1000℃, calcination time 0.5h. The prepared calcium aluminate has 90% soluble alumina, 54% alumina content and 34% calcium oxide.

Embodiment 2

[0028] The aluminum ash is treated according to the process of catalytic hydrolysis-acidolysis-washing. The catalytic hydrolysis section: the liquid-solid ratio is 3ml / g, the reaction temperature is 85°C, the reaction time is 2h, and the cycle times of the hydrolyzate is 5 times; the acidolysis section: the liquid-solid ratio is 4ml / g, reaction temperature 80℃, reaction time 1h, hydrochloric acid concentration 150g / l; sintering section: molding pressure 100MPa, calcination temperature 1100℃, calcination time 1h. The prepared calcium aluminate has 92% soluble alumina, 56% alumina content and 22% calcium oxide.

Embodiment 3

[0030] The aluminum ash is treated according to the process of catalytic hydrolysis-acidolysis-washing. The catalytic hydrolysis section: the liquid-solid ratio is 3ml / g, the reaction temperature is 95°C, the reaction time is 3h, and the cycle times of the hydrolyzate is 6 times; the acidolysis section: the liquid-solid ratio is 5ml / g, reaction temperature 95°C, reaction time 2h, hydrochloric acid concentration 200g / l; sintering section: molding pressure 120MPa, calcination temperature 1200°C, calcination time 1h. The prepared calcium aluminate has 96% soluble alumina, 60% alumina content and 28% calcium oxide.

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Abstract

The invention discloses a method for preparing calcium aluminate by utilizing aluminum ash and acetylene sludge. The method comprises the following steps: performing catalytic hydrolysis, acidolysis and washing on aluminum ash so as to prepare high-purity aluminum ash powder; performing ball-mill mixing on the high-purity aluminum ash powder and acetylene sludge, performing compression molding onthe mixed powder, and sintering in a sintering furnace to prepare an active calcium aluminate bulk material; crushing and performing ball milling, thereby obtaining the high-activity calcium aluminaterefining agent. The calcium aluminate refining agent prepared by the method disclosed by the invention is excellent in property, and standard requirements of calcium aluminate YB / T4265-2011 for a steel-making slag remover are met. The method disclosed by the invention solves the pollution problems of the aluminum ash and acetylene sludge hazardous / solid wastes to the environment, realizes resource utilization, and has excellent environmental, economic and social benefits.

Description

technical field [0001] The invention relates to the field of safe disposal of hazardous waste, resource utilization of bulk industrial solid waste and application of calcium aluminate, in particular to a method for preparing calcium aluminate by using aluminum ash and carbide slag. Background technique [0002] Aluminum ash is a hazardous waste produced by the electrolytic aluminum, aluminum processing and aluminum recycling industries, with an annual discharge of more than 2 million tons. The electrolytic aluminum industry produces about 30-50kg of aluminum ash for every 1 ton of aluminum produced. At present, after the aluminum ash produced in the aluminum industry is fried to recover elemental aluminum, a large amount of secondary aluminum ash is stored, causing serious pollution to the atmosphere and soil. In the production process of aluminum ingots, a lot of metal elements need to be added to ensure the performance of the product. Therefore, it is of great significance...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/16
CPCC01F7/164
Inventor 李占兵李少鹏李会泉张建波孙振华
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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