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A method for preparing cement kiln fuel by using aluminum electrolysis waste cathode

A technology of aluminum electrolysis and cement kiln, which is applied in the field of cement, can solve the problems of insufficient reaction, reduction of cement strength, and the addition of no more than 5%, so as to alleviate the effect of increasing depletion

Active Publication Date: 2021-07-23
HONGHE COLLEGE
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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 for preparing cement kiln fuel by using the waste cathode of aluminum electrolysis, aiming to solve the problems of equipment corrosion, reduction of cement strength and addition amount not exceeding 5 %, waste cathodes are added from the hot end, and alumina, silicate and raw materials cannot fully react, etc.

Method used

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  • A method for preparing cement kiln fuel by using aluminum electrolysis waste cathode
  • A method for preparing cement kiln fuel by using aluminum electrolysis waste cathode
  • A method for preparing cement kiln fuel by using aluminum electrolysis waste cathode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Take 100kg of waste and old cathodes, after testing, the carbon content is 64.1wt%, the NaF content is 6.45wt%, and the NaF content is 6.45wt%. 3 AlF 6 The content is 2.01wt%, containing CaF 2 The content is 2.17wt%, Al 2 o 3 Content is 10.25wt%, SiO 2 The content is 2.24wt%, and the sodium content is 4.71wt%. It is crushed to 3-10mm, put into the crucible in the vacuum distillation furnace, and the crucible is provided with a fluoride collector, and the cooling water is connected after sealing the vacuum distillation furnace.

[0036] (2) Start the vacuum pump, make the pressure in the furnace drop to 10Pa, turn on the heating system to heat, when the temperature reaches 600 ° C, keep warm for 2 hours, then stop heating, the vacuum furnace is naturally cooled, and after cooling, 91.5 kg of distillation residue is obtained in the crucible, Obtain fluoride 8.5kg in the fluoride collector, and its main components are sodium fluoride and cryolite.

[0037] (3) Cru...

Embodiment 2

[0042] (1) Take 100kg of waste and old cathodes, after testing, the carbon content is 49.5wt%, the NaF content is 7.22wt%, and the NaF content is 7.22wt%. 3 AlF 6 The content is 2.52wt%, containing CaF 2 The content is 2.5wt%, Al 2 o 3 Content is 11.79wt%, SiO 2 The sodium content is 2.58wt%, and the sodium content is 5.42wt%. It is crushed to 3-10mm and put into a crucible in a vacuum distillation furnace.

[0043] (2) Start the vacuum pump to reduce the pressure in the furnace to 5 Pa, turn on the heating system for heating, and when the temperature reaches 550° C., keep warm for 2 hours, then stop heating, and the vacuum furnace cools naturally. After cooling, 91.1 kg of distillation residue is obtained in the crucible, Obtain 9.9kg of fluoride in the fluoride collector, the main components of which are sodium fluoride and cryolite.

[0044] (3) Crush the distillation residue to less than 3mm, put it into a ball mill for wet grinding to less than 0.074mm, control the p...

Embodiment 3

[0048] (1) Take 100kg of waste and old cathodes, after testing, the carbon content is 37.5wt%, the NaF content is 11.25wt%, and the NaF content is 11.25wt%. 3 AlF 6 The content is 3.41wt%, containing CaF 2 The content is 3.78wt%, Al 2 o 3 Content is 17.84wt%, SiO 2 The content is 3.9wt%, and the sodium content is 8.2wt%. It is crushed to 3-10mm, and put into a crucible in a vacuum distillation furnace. A fluoride collector is arranged on the crucible, and the cooling water is connected after sealing the vacuum distillation furnace.

[0049] (2) Start the vacuum pump, make the pressure in the furnace drop to 10Pa, turn on the heating system for heating, when the temperature reaches 700°C, keep warm for 1h, then stop heating, the vacuum furnace cools naturally, and after cooling, 85.2kg of distillation residue is obtained in the crucible, Obtain fluoride 14.8kg in the fluoride collector, and its main component is sodium fluoride and cryolite.

[0050] (3) Crush the distilla...

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Abstract

The invention discloses a method for preparing cement kiln fuel by using the waste cathode of aluminum electrolysis. The waste cathode is crushed to 3 mm to 10 mm, the vacuum pump is started, and the heating system is turned on. Then stop heating, get the distillation residue in the crucible, and get fluoride in the fluoride collector; crush the distillation residue, put it into a ball mill for wet grinding, add inhibitor water glass and collector oleic acid to make slurry, and put it into a flotation machine After roughing, sweeping and beneficiation, the concentrate and tailings are obtained respectively. After filtering and drying, the concentrate is added as cement kiln fuel from the hot end, and the tailings are added to the cement kiln raw material from the cold end. The invention solves the problems of equipment corrosion, reduction of cement strength and addition amount not exceeding 5% when aluminum electrolysis waste cathodes are directly added as fuel in the cement rotary kiln. The waste cathodes are added from the hot end, wherein alumina, silicate and raw meal Questions that do not adequately respond.

Description

technical field [0001] The invention belongs to the field of cement and the field of secondary utilization of waste resources, in particular to a method for preparing cement kiln fuel by using waste cathodes of aluminum electrolysis. Background technique [0002] Aluminum electrolysis waste cathode is a kind of solid waste produced by the overhaul of aluminum electrolysis cells, and its main components are carbon, fluoride, alumina and silicate. In the clinker sintering process of cement rotary kiln, replacing part of the coal with the waste cathode of aluminum electrolysis as fuel can reduce the consumption of coal, and at the same time, fluorides such as sodium fluoride, cryolite and calcium fluoride can reduce the firing temperature. [0003] However, the following problems still exist in directly adding waste cathodes as fuel: ① sodium fluoride, cryolite and other fluorides contain high sodium, which is easy to affect the quality of cement and reduce its strength; ② sodi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L5/48C04B7/44
CPCC04B7/4423C04B7/4438C10L5/48Y02P40/125
Inventor 李楠易中周单科孙红燕孙丽达姜艳
Owner HONGHE COLLEGE
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