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Method and system for preparing alumina clinker from homogenized raw slurry

A raw slurry and alumina technology, applied in the field of alumina, can solve the problems of large concentration deviation of raw slurry, low temperature and high energy consumption, and achieve the effects of reducing moisture content, concentration deviation and sintering energy consumption.

Active Publication Date: 2020-01-31
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method that can reduce the concentration deviation of raw slurry and improve Method and system for preparing alumina clinker from homogenized raw slurry with raw slurry temperature and lower energy consumption

Method used

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  • Method and system for preparing alumina clinker from homogenized raw slurry
  • Method and system for preparing alumina clinker from homogenized raw slurry

Examples

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Effect test

preparation example Construction

[0052] figure 1 The alumina clinker preparation system shown includes: raw slurry mixing tank 1, raw slurry qualified tank 2, spray gun 3, rotary kiln 4, cooling machine 5, coal bunker 6, fan 7, rotor scale 8, combustion-supporting fan 9. Cyclone dust collector 10, induced draft fan 11, electrostatic precipitator 12, chimney 13 and high-pressure fan 14; wherein, the raw slurry outlet of raw slurry mixing tank 1 is connected with the raw slurry inlet of raw slurry qualified tank 2, The raw slurry outlet of the qualified raw slurry tank 2 is connected with the spray gun 3, and the nozzle of the spray gun 3 is set at the tail of the rotary kiln 4; The coal inlet is connected, the coal outlet of the rotor scale 8 is connected with the coal inlet of the combustion chamber at the tail of the rotary kiln 4, the gas-supporting outlet of the combustion-supporting fan 9 is connected with the combustion chamber gas-supporting inlet of the tail of the rotary kiln 4; the cooler 5 is connec...

Embodiment 1

[0055] This example is used to illustrate the preparation method of the alumina clinker of the present invention.

[0056] use figure 1 and figure 2 In the device shown, the size of the raw slurry preparation tank 1 is width*height=3m*3m, the size of the qualified raw slurry tank 2 is width*height=6m*6m, and the size of the rotary kiln 4 is height*length=1.9m *40m; the top of the raw slurry mixing tank 1 and the qualified raw slurry tank 2 are each equipped with an atomizing nozzle with an inner diameter of 8mm; the specific operations include:

[0057] (1) The alumina raw slurry is 3.5m 3 The flow rate of / h is sprayed into the raw slurry preparation tank 1 through the nozzle 21, and the waste heat flue gas with a temperature of 200 3 The flow rate of / h is passed in the raw slurry mixing tank 1, and the agitating paddle stirring speed is set to carry out the first homogenization (residence time is about 12h) under the 55rpm; the alumina raw slurry obtained after the firs...

Embodiment 2

[0062] This example is used to illustrate the preparation method of the alumina clinker of the present invention.

[0063] use figure 1 and figure 2 In the shown device, the size of the raw slurry preparation tank 1 is width*height=7.5m*20m, the size of the qualified raw slurry tank 2 is width*height=14m*20m, and the size of the rotary kiln 4 is height*length=4.5 m*90m; 3 atomizing nozzles are installed on the top of raw slurry blending tank 1 and raw slurry qualified tank 2 respectively, with an inner diameter of 8mm; specific operations include:

[0064] (1) The alumina raw slurry is 70m 3 The flow rate of / h is sprayed into the raw slurry preparation tank 1 through the nozzle 21, and the waste heat flue gas with a temperature of 200 3 The flow rate of / h is passed in the raw slurry mixing tank 1, and the agitating paddle stirring speed is set to carry out the first homogenization (residence time is about 24h) under 28rpm; the alumina raw slurry after the first homogeniz...

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Abstract

The invention relates to the field of alumina, and specifically relates to a method and system for preparing an alumina clinker from a homogenized raw slurry. The method comprises the following steps:(1) adding an alumina raw slurry into a raw slurry blending tank by spraying to be subjected to first homogenization; (2) adding the alumina raw slurry subjected to the first homogenization to a qualified raw slurry tank by spraying to be subjected to second homogenization; and (3) sending the alumina raw slurry subjected to the second homogenization to a rotary kiln for counter-flow heat exchange with a hot air flow to produce the alumina clinker, wherein a part of waste heat flue gas discharged from the rotary kiln is introduced into the alumina raw slurry in the raw slurry blending tank and the alumina raw slurry in the qualified raw slurry tank. According to the method and system, the alumina raw slurry can be relatively well homogenized to reduce concentration deviations of differentpositions in the alumina raw slurry, so that the homogeneity of the raw slurry component is guaranteed. In addition, the temperature of the raw slurry is effectively increased, the moisture content is reduced, and the sintering energy consumption is reduced.

Description

technical field [0001] The invention relates to the field of alumina, in particular to a method and system for preparing alumina clinker from homogenized raw slurry. Background technique [0002] At present, in the process of alumina production, the stirring forms of raw slurry blending tank and qualified tank include mechanical paddle stirring, hanging chain stirring, air stirring and other forms; but no matter what kind of stirring form is limited to raw slurry material properties, both have poor stirring uniformity, large difference in solid content between the tank top and tank bottom, resulting in large differences in alkali ratio, calcium ratio, iron-aluminum ratio, moisture and other indicators at different positions in the tank, which brings great disadvantages to production control ; At the same time, the tank wall is prone to scarring, and it must be stopped regularly for cleaning. In addition, due to the concentration of the circulating mother liquor of sodium ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02C01F7/08
CPCC01F7/02C01F7/085Y02P20/129
Inventor 闫学良常彬杰崔鑫高星罗峰肖永丰孙琦
Owner CHNA ENERGY INVESTMENT CORP LTD
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