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Method and system for co-processing electrolytic manganese residues in cement kiln

A technology of electrolytic manganese slag and co-processing, applied in cement production, etc., can solve the problems of affecting the quality of cement clinker, not being uniformly dispersed, and low consumption of combustion aids

Active Publication Date: 2021-08-20
崇左南方水泥有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this method has the following deficiencies: (1) the raw manganese slag containing water is directly added from the kiln tail smoke chamber, and cannot be uniformly dispersed, so that the manganese slag and other materials cannot be uniformly mixed and reacted, thereby affecting the quality of cement clinker; (2) The moisture in the manganese slag is high. After adding in the kiln tail smoke chamber, the water evaporates and needs to absorb more heat, which not only increases heat consumption, but also interferes with the thermal system and affects normal production; (3) Kiln tail smoke The flow field characteristics of the chamber and the NOx formation and reduction reaction characteristics in the cement kiln, the ammonia in the manganese slag has little effect on reducing the NOx in the flue gas
In this patent, manganese slag is mixed with coal powder as one of the components of the combustion aid, but the amount of combustion aid used is low, and the large-scale treatment of manganese slag cannot be realized

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  • Method and system for co-processing electrolytic manganese residues in cement kiln
  • Method and system for co-processing electrolytic manganese residues in cement kiln
  • Method and system for co-processing electrolytic manganese residues in cement kiln

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Effect test

Embodiment 1

[0041] like figure 1 As shown, it is a schematic diagram of the process flow in this embodiment, the dotted line in the figure indicates the direction of gas and materials, and the solid line indicates the direction of materials. The coal-fired disposal equipment of the original calciner 12 in the new dry-process cement clinker production line includes: calciner raw coal bin 2, calciner coal mill 3, calciner pulverized coal bin 4, and the coal-fired disposal equipment of the rotary kiln includes the rotary kiln raw coal bin 6. Rotary kiln coal mill 7 (rotary kiln coal mill and calciner coal mill can usually share one mill), rotary kiln coal powder bin 8, rotary kiln burner 9. In order to pre-store the electrolytic manganese slag, it is set in the electrolytic manganese slag bin 1. Electrolytic manganese slag bin 1, calciner raw coal bin 2, calciner coal mill 3, calciner pulverized coal bin 4, pulverized coal burner 5, and calciner 12 constitute the main unit for co-processing...

Embodiment 2

[0045] In the 5,000-ton new dry-process cement clinker production line, 5% electrolytic manganese slag is mixed into the coal through the metering device and the conveying device, and the water content of the electrolytic manganese slag is about 30%. Specifically, the transported electrolytic manganese slag to be disposed is first stored in the manganese slag bin 1, and the electrolytic manganese slag is transported to the coal mill through the metering device and the conveying device, and is processed together with the raw coal. The high-temperature waste gas from the kiln, manganese slag is mixed with coal powder, dried and ground at the same time. The ground pulverized coal containing manganese slag is stored in the pulverized coal bin specially used for calciner 12 combustion. The pulverized coal in the pulverized coal bunker is sprayed into the calciner 12 through the coal injection pipe of the calciner 12, and the pulverized coal is burned in the calciner 12, and the hea...

Embodiment 3

[0048] In the 5,000-ton new dry-process cement clinker production line, 15% electrolytic manganese slag is mixed into the coal through the metering device and conveying device, and the water content of the electrolytic manganese slag is about 15%. Specifically, the transported electrolytic manganese slag to be disposed is first stored in the manganese slag bin 1, and the electrolytic manganese slag is transported to the coal mill through the metering device and the conveying device, and is processed together with the raw coal. The high-temperature waste gas from the kiln, manganese slag is mixed with coal powder, dried and ground at the same time. The ground pulverized coal containing manganese slag is stored in the pulverized coal bin specially used for calciner 12 combustion. The pulverized coal in the pulverized coal bunker is sprayed into the calciner 12 through the coal injection pipe of the calciner 12, and the pulverized coal is burned in the calciner 12, and the heat g...

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Abstract

The invention discloses a method and a system for co-processing electrolytic manganese residues in a cement kiln, and belongs to an electrolytic manganese residue utilization technology. In a novel dry method cement clinker production line, electrolytic manganese residues and coal are added into a coal mill in proportion, the electrolytic manganese residues and the coal are mixed, dried and ground at the same time, obtained coal powder containing the electrolytic manganese residues is stored, the stored coal powder is sprayed into a decomposing furnace through a coal spraying pipe, and the decomposing furnace is kept in normal operation. According to the method, the electrolytic manganese residues are subjected to harmless treatment and resource utilization by utilizing an existing pre-decomposition kiln cement clinker production line.

Description

technical field [0001] The invention relates to the technical field of utilization of electrolytic manganese slag, in particular to a method and system for co-processing electrolytic manganese slag in a cement kiln. Background technique [0002] The cement production process is mainly "two grindings and one firing". Calcium raw materials, silicon raw materials, etc. are mixed in a certain proportion and then ground into raw materials, and then calcined at high temperature in the kiln system to form cement clinker, and then gypsum, etc. are added. Finely ground. During the calcination process of cement clinker, a large amount of nitrogen oxides (NOx) will be produced. According to relevant statistics of the environmental protection department, the nitrogen oxide emissions of the cement industry account for about 10-12% of the national total. The hazards of NOx are various. It enters the deep part of human lungs through breathing, which can cause bronchitis or emphysema. It c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/43C04B7/38C04B7/147C04B7/36
CPCC04B7/4407C04B7/38C04B7/147C04B7/364Y02P40/10
Inventor 季军荣武双磊周洲严金生刘翠徐迅蒋德洪陈胡星
Owner 崇左南方水泥有限公司