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Method for synchronously activating, inerting, removing impurities and melting calcium aluminate by using low-magnesium aluminum ash

A technology of calcium aluminate and aluminum ash, which is applied in the preparation of calcium aluminate, alkaline earth metal aluminate/alumina/aluminum hydroxide, etc. It can solve the problems of reducing the desulfurization performance of calcium aluminate and the difficulty of synthesis and purification of calcium aluminate , to meet the requirements of industrial production, low production cost, and reduce the synthesis temperature

Active Publication Date: 2021-04-30
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It brings great difficulties to the subsequent synthesis and purification of calcium aluminate. Doping a large amount of high-melting-point magnesium-aluminum spinel in the calcium aluminate system will significantly reduce the desulfurization performance of calcium aluminate

Method used

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  • Method for synchronously activating, inerting, removing impurities and melting calcium aluminate by using low-magnesium aluminum ash
  • Method for synchronously activating, inerting, removing impurities and melting calcium aluminate by using low-magnesium aluminum ash

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Embodiment 1

[0028] Using aluminum ash (aluminum content 63.6%, oxygen content 1.8%) of an aluminum smelter as raw material, the method firstly mixes aluminum ash slag with calcium-containing additives, and the calcium-containing additives are limestone, slaked lime, quicklime mixture (limestone: slaked lime: Quicklime=40%:10%:50%), the ratio control range of aluminum ash and calcium-containing additives is Al:(Ca+Mg)=1:1.15; the material after mixing is wet ball milled, and the liquid-solid ratio of the ball mill is 1 : 0.9, the ball milling speed is 20r / min, and the ball milling time is 6h; after the ball milling, the material is washed and solid-liquid separation is carried out, and finally the dried sample is placed in an air atmosphere for two-stage controlled temperature roasting, wherein the roasting temperature of one stage is 800°C , the roasting time is 2h; the second-stage roasting temperature is 1450°C, and the roasting time is 2h, and the obtained product is calcium aluminate s...

Embodiment 2

[0030] Using aluminum ash (aluminum content 63.6%, oxygen content 1.8%) of an aluminum smelter as raw material, the method firstly mixes aluminum ash slag with calcium-containing additives, and the calcium-containing additives are limestone, slaked lime, quicklime mixture (limestone: slaked lime: Quicklime=20%:20%:60%), the ratio control range of aluminum ash and calcium-containing additives is Al:(Ca+Mg)=1:1.21; the material after mixing is wet-type ball milled, and the liquid-solid ratio of the ball mill is 1 : 0.3, the ball milling speed is 10r / min, and the ball milling time is 12h; after the ball milling, the material is washed and solid-liquid separation is carried out, and finally the dried sample is placed in an air atmosphere for two-stage controlled temperature roasting, wherein the roasting temperature of one stage is 400°C , the roasting time is 4h; the second-stage roasting temperature is 1350°C, and the roasting time is 3h. The obtained product is calcium aluminate...

Embodiment 3

[0032] Using aluminum ash (70.6% aluminum content, 1.0% oxygen content) of an aluminum smelter as raw material, the method firstly mixes aluminum ash slag with calcium-containing additives, and the calcium-containing additives are limestone, slaked lime, and quicklime mixture (limestone: slaked lime: Quicklime=20%:30%:50%), the ratio control range of aluminum ash and calcium-containing additives is Al:(Ca+Mg)=1:1.18; the material after mixing is wet ball milled, and the liquid-solid ratio of the ball mill is 1 : 0.7, the ball milling speed is 30r / min and the ball milling time is 8h; after the ball milling, the material is washed and solid-liquid separation is carried out, and finally the dried sample is placed in an air atmosphere for two-stage controlled temperature roasting, wherein the roasting temperature of one stage is 800°C. The roasting time is 4 hours; the second-stage roasting temperature is 1350°C, and the roasting time is 2 hours. The obtained product is a calcium a...

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Abstract

The invention discloses a method for synchronously activating, inerting, removing impurities and melting calcium aluminate by using low-magnesium aluminum ash, wherein the method comprises the steps: carrying out wet ball milling on a mixed raw material of the low-magnesium aluminum ash and a calcium-containing additive, and sequentially carrying out solid-liquid separation, drying and roasting treatment on the ball-milled material to obtain a calcium aluminate series product. According to the method, the calcium aluminate series product capable of being used for iron and steel smelting desulfurization is prepared from the low-magnesium aluminum ash generated in the aluminum smelting machining process, comprehensive utilization of hazardous waste is achieved, high economic value can be obtained, and the method is easy to operate, low in cost, environmentally friendly and capable of meeting the industrial production requirement.

Description

technical field [0001] The present invention relates to a method for preparing calcium aluminate, in particular to a method of using low-magnesium aluminum ash as a raw material and synchronously activating, inerting, impurity-removing and melting calcium aluminate, which belongs to the field of recycled metals and the field of comprehensive utilization of solid waste . Background technique [0002] Aluminum ash slag is aluminum-containing waste slag formed during the production, processing and recycling of metal aluminum and aluminum alloys. It is divided into two types: white slag and black slag. The white slag is the aluminum slag produced in the upper layer of the melt during the melting and casting process of electrolytic aluminum and recycled aluminum. The metal aluminum content in the white slag can reach 80%, which can be used as a raw material for the secondary aluminum industry; the black slag is fried ash for primary aluminum ash, The fine ash obtained by fine gr...

Claims

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Application Information

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IPC IPC(8): C01F7/16C21C7/064
CPCC01F7/164C21C7/0645C01P2006/80C01P2002/72
Inventor 苏子键张元波刘康姜涛李光辉范晓慧刘硕刘继成涂义康王嘉侯炜赵雪娟朱应贤林坤王琰成相霖
Owner CENT SOUTH UNIV
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