Nepheline preheating, pre-decomposing and dry sintering technology and device for producing alumina clinker

A pre-decomposition and alumina technology, which is applied in the preparation of alkali metal aluminate/alumina/hydroxide, chemical industry, sustainable manufacturing/processing, etc., can solve the tension in the supply of high-quality bauxite, bauxite High ore quality requirements, high energy consumption of wet process and other issues, to achieve the effect of expanding production capacity, reducing fuel costs, and convenient pipe layout

Pending Publication Date: 2018-03-06
TIANJIN CEMENT IND DESIGN & RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there is no domestic factory that uses nepheline dry sintering to produce alumina, and most of the alumina production projects are produced by the Bayer process. High energy consumption and low resource utilization

Method used

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  • Nepheline preheating, pre-decomposing and dry sintering technology and device for producing alumina clinker

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A process for producing alumina clinker by preheating and pre-decomposing dry sintering of nepheline, comprising the following steps:

[0033] 1) The raw material nepheline, limestone and white slurry are measured in proportions of 30%, 60% and 10% by weight respectively, and the raw meal is obtained by grinding and homogenizing. The rate of the raw meal is the alkali-aluminum ratio Na 2 O / Al 2 o 3 1.8-2.1, calcium silicon ratio CaO / SiO 2 0.9-1.1;

[0034] 2) Send the raw material obtained in step 1) to the preheater; after being preheated by the preheater, it enters the calciner for decomposition, and then enters the rotary kiln for calcination. The calcination temperature of the rotary kiln firing zone is 1200-1400°C The residence time is 20-50 minutes;

[0035] 3) The calcined clinker is cooled by a grate cooler to obtain alumina clinker.

[0036] Among them, the cooling air of the grate cooler exchanges heat with the 1100-1400 ℃ high-temperature clinker exiting...

Embodiment 2

[0038] The difference from Example 1 is that the raw material nepheline, limestone and white slurry are measured in proportions of 45%, 55% and 0% by weight, respectively, and the raw meal is obtained by grinding and homogenizing, and the calcination of the rotary kiln firing zone The temperature is 1250-1350°C, and the residence time in the kiln is 30-40 minutes. The cooling air of the grate cooler exchanges heat with the 1100-1350°C high-temperature clinker exiting the rotary kiln.

Embodiment 3

[0040] The difference from Example 1 is that the raw material nepheline, limestone and white slurry are measured in proportions of 35%, 60% and 5% by weight, respectively, and the raw meal is obtained by grinding and homogenizing, and the calcination of the rotary kiln firing zone The temperature is 1300-1400°C, and the residence time in the kiln is 20-35 minutes.

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Abstract

The invention discloses a nepheline preheating, pre-decomposing and dry sintering technology and device for producing an alumina clinker. The technology comprises the following steps: powdering and homogenizing raw materials including nepheline, limestone and white slurry; feeding the homogenized powder into a preheater; preheating through the preheater; decomposing through a decomposing furnace;entering a rotary kiln for roasting for 20-50min at the temperature of 1200-1400 DEG C; and then entering a grate cooler for cooling, thus obtaining the qualified alumina clinker. The device comprisesthe preheaters, the decomposing furnace, the rotary kiln and the grate cooler, wherein the preheater comprises at least three grades of preheaters which sequentially communicate; a smoke channel at the tail of the rotary kiln is provided with a bypass air exhausting device; an alumina clinker outlet is formed in the end part of the grate cooler; the decomposing furnace is subjected to tertiary air one-side feeding. According to the technology, the nepheline is used as the aluminum raw material; the alumina sintering technology is developed from the wet technology to the preheating and decomposing dry technology; massive production is realized; the energy conservation and the consumption reduction are greatly realized; the system operation is simple; the raw material cost and the fuel costare decreased; and the automation degree is high.

Description

technical field [0001] The invention belongs to the technical field of alumina production, in particular to a process and equipment for producing alumina clinker by preheating and predecomposing dry sintering of nepheline. Background technique [0002] The identified bauxite resources in our country are based on the current mining speed, and the resource guarantee period is about 20 years, which is far from meeting the needs of the sustainable development of my country's aluminum industry. Since 2000, my country began to import a large amount of bauxite, and the foreign dependence of aluminum resources is as high as 50%. With the increasing shortage of bauxite resources, the problems of rising bauxite prices and declining grades have become increasingly serious, and some enterprises even have short-term shutdowns due to bauxite supply problems. Therefore, the development and utilization of aluminum-containing non-bauxite resources to replace part of bauxite is conducive to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/04
CPCC01F7/04Y02P20/10
Inventor 马娇媚陈昌华陶从喜彭学平郭天代赵亮代中元
Owner TIANJIN CEMENT IND DESIGN & RES INST
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