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A method for synchronously preparing sodium aluminate through sintering and denitrification of aluminum ash and soda

A technology of sodium aluminate and aluminum ash, applied in the fields of mineral processing and non-ferrous metallurgy, can solve the problems of secondary pollution, high production cost, complicated process, etc., and achieve the effects of low cost, simple operation and low energy consumption

Active Publication Date: 2020-03-13
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the defects of high production cost, complex process, and easy to produce secondary pollution in the comprehensive utilization process of aluminum ash in the prior art, the purpose of the present invention is to provide a method of using aluminum ash as a raw material and controlling the temperature and atmosphere to soda A method of high-temperature sintering to efficiently remove impurity elements and obtain sodium aluminate simultaneously. This method converts the nitrogen in the aluminum nitride component of aluminum ash into environmentally harmless nitrogen to avoid secondary environmental pollution caused by the formation of NOx; The aluminum component is efficiently converted into sodium aluminate and directly returned to the alumina production process. This method is simple to operate, low in production cost, and environmentally friendly, meeting the requirements of industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Using aluminum ash (aluminum content 58.6%, nitrogen content 8.3%) of an aluminum smelting plant as raw material, first mix aluminum ash and mixed sodium salt according to the element ratio of aluminum and sodium 1:1.1, the ratio of mixed sodium salt is sodium carbonate, carbonic acid The mass ratio of sodium hydrogen and sodium peroxide is 85:17:8, the raw materials are mixed and then pressed into agglomerates with a diameter of 15mm; after the agglomerates are fully dried, they are placed in an air atmosphere for a period of roasting, and the roasting temperature is 500°C. The roasting time is 120min, and the roasting atmosphere is air; the second-stage roasting temperature is 700°C, the roasting time is 120min, and the roasting atmosphere is O 2 / (O 2 +N 2 )=40%; after the roasting is finished, the cooled lump is broken, ground and soaked in alkaline solution, and solid-liquid separation to obtain sodium aluminate solution. The aluminum recovery rate in the whole p...

Embodiment 2

[0027] Using aluminum ash (aluminum content 58.6%, nitrogen content 8.3%) of an aluminum smelting plant as raw material, first mix aluminum ash and mixed sodium salt according to the elemental ratio of aluminum and sodium 1:1.3, the ratio of mixed sodium salt is sodium carbonate, carbonic acid The mass ratio of sodium hydrogen and sodium peroxide is 70:25:5, the raw materials are mixed and then pressed into agglomerates with a diameter of 15mm; after the agglomerates are fully dried, they are placed in an air atmosphere for a period of roasting, and the roasting temperature is 300°C. The roasting time is 180min, the roasting atmosphere is air; the second-stage roasting temperature is 875°C, the roasting time is 150min, and the roasting atmosphere is O 2 / (O 2 +N 2)=65%; after the calcination is finished, the cooled agglomerate is crushed, ground and soaked in an alkaline solution, and solid-liquid separated to obtain a sodium aluminate solution. The aluminum recovery rate in...

Embodiment 3

[0029] Using aluminum ash (aluminum content 58.6%, nitrogen content 8.3%) of an aluminum smelting plant as raw material, first mix aluminum ash and mixed sodium salt according to the elemental ratio of aluminum and sodium 1:1.2, the ratio of mixed sodium salt is sodium carbonate, carbonic acid The mass ratio of sodium hydrogen and sodium peroxide is 70:17:13, the raw materials are mixed and then pressed into agglomerates with a diameter of 15mm; after the agglomerates are fully dried, they are placed in an air atmosphere for a period of roasting, and the roasting temperature is 500°C. The roasting time is 150min, the roasting atmosphere is air; the second-stage roasting temperature is 850°C, the roasting time is 180min, and the roasting atmosphere is O 2 / (O 2 +N 2 )=55%; after the roasting is finished, the cooled agglomerate is crushed, ground and soaked in an alkaline solution, and solid-liquid separated to obtain a sodium aluminate solution. The aluminum recovery rate in ...

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Abstract

The invention discloses a method for synchronously preparing sodium aluminate through aluminum ash soda sintering denitrification. The method comprises the steps that aluminum ash and mixed sodium salt prepared from sodium carbonate, sodium bicarbonate and sodium peroxide are mixed evenly, and pressed into agglomerates; the agglomerates are dried and sequentially placed in an air atmosphere to besubjected to first-section low-temperature roasting and placed in a strong-oxidizing atmosphere to be subjected to second-section intermediate-temperate roasting, roasted products are cooled and crushed, and then leached out by an alkaline solution, and thus a sodium aluminate solution is obtained. According to the method, industrial waste residue is utilized as a main raw material, the raw material source is wide, the cost is low, the aluminum recovery rate is high, operation is easy, the production cost is low, the environmental friendly effect is achieved, and industrial production requirements are met.

Description

technical field [0001] The invention relates to a method for preparing sodium aluminate by using aluminum ash, in particular to a method for synchronously preparing sodium aluminate by using aluminum ash as a raw material through high-temperature sintering and denitrification with soda, belonging to the fields of mineral processing and nonferrous metallurgy. Background technique [0002] Aluminum ash is aluminum-containing waste slag produced in the process of alumina electrolysis, aluminum processing and waste regeneration. According to incomplete statistics, 30-50kg of aluminum ash will be formed for every ton of electrolytic aluminum produced. The total amount of aluminum ash produced in my country is as high as 100- 2 million tons. The main metal element in aluminum ash is aluminum, which mainly exists in the form of metal aluminum, aluminum oxide and aluminum nitride, and also contains a small amount of silicon, magnesium, sodium, calcium and other elements. Aluminum ni...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/06
Inventor 张元波苏子键姜涛刘会群陈茜钧范晓慧李光辉彭志伟饶明军黄柱成郭宇峰杨永斌古佛全涂义康王嘉
Owner CENT SOUTH UNIV
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