Fluidized calcination device and method for treating high-iron low-aluminum coal series kaolinite

A technology of coal-based kaolin and calcination equipment, which is applied in chemical instruments and methods, inorganic chemistry, silicon compounds, etc., and can solve problems such as non-circulation, small production scale, and long residence time of materials

Active Publication Date: 2016-12-21
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Iron is the main dyeing factor of kaolin. Iron mostly exists in kaolin in the form of hematite, limonite, siderite, pyrite, ilmenite and other minerals. The above iron minerals will become Fe when calcined at high temperature. 2 o 3 , causing calcined kaolin to turn yellow or brick red, unable to improve its whiteness and other properties; at present, high-iron coal-measure kaolin (TFe>2%) accounts for the majority of coal-measure kaolin in my country, and is limited by the current technology that cannot efficiently remove calcined kaolin Iron minerals make the high-iron coal series kaolin with abundant reserves in my country unable to be effectively utilized
[0004] At present, China's coal series kaolin calcination technology mainly adopts fixed bed tunnel kiln or downdraft kiln, moving bed vertical kiln, and rotary kiln for calcination. The above processes have small production scale, large investment, low output, high energy consumption, and product quality is not easy to control
In addition, there is a fluidized bed calcination technology in its infancy, such as the invention title of CN1915814A "The Fluidized Instant Calcina

Method used

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  • Fluidized calcination device and method for treating high-iron low-aluminum coal series kaolinite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The structure of the fluidized calcination device for processing high-iron and low-aluminum coal series kaolin is as follows: figure 1 As shown, it includes feeding bin 1, gas burner 3, suspension preheater 4, suspension calciner 5, cyclone separator (two primary cyclone separators and secondary cyclone separator 13), iron removal reducer 6, Electromagnetic iron remover 8, whiteness monitor, material cooler 9 and Rhodes fan 15; the outlet of feeding bin 1 is connected with the feed port of primary cyclone separator 2, and the discharge port of primary cyclone separator 2 is connected with The feed port at the bottom of the suspension preheater 4 is connected, the top of the suspension preheater 4 is connected with the top of the suspension calciner 5 through the upper channel, and the discharge port at the bottom of the suspension calciner 5 is connected to the feed port of the iron removal reducer 6 Connected, the discharge port on the side of the iron removal reducer ...

Embodiment 2

[0073] The structure of the fluidized calcination device for processing high-iron and low-aluminum coal series kaolin is the same as that in Example 1, except that:

[0074] (1) The volume ratio of the suspension preheater to the suspension calciner is 1:0.6;

[0075] (2) The diameter-to-height ratio of the large cylinder is 1:4, and the diameter-to-height ratio of the small cylinder is 1:2;

[0076] (3) The ratio of the height of the connecting port to the height of the small cylinder itself is 1:3; the volume ratio of the large cylinder to the small cylinder is 1:0.4; the volume ratio of the primary cyclone separator to the secondary cyclone separator is 1 :3;

[0077] Method is with embodiment 1, and difference is:

[0078] (1) Control the temperature of the material at 1000°C and in a suspended state;

[0079] (2) Control the material temperature in the suspension calciner at 700°C;

[0080] (3) A reduction reaction occurs between the reducing gas and the calcined mate...

Embodiment 3

[0091] The structure of the fluidized calcination device for processing high-iron and low-aluminum coal series kaolin is the same as that in Example 1, except that:

[0092] (1) The volume ratio of the suspension preheater to the suspension calciner is 1:0.1;

[0093] (2) The diameter-to-height ratio of the large cylinder is 1:3, and the diameter-to-height ratio of the small cylinder is 1:1;

[0094] (3) The ratio of the height of the connecting port to the height of the small cylinder itself is 1:5; the volume ratio of the large cylinder to the small cylinder is 1:0.2; the volume ratio of the primary cyclone separator to the secondary cyclone separator is 1 :5;

[0095] Method is with embodiment 1, and difference is:

[0096] (1) Control the temperature of the material at 1300°C and in a suspended state;

[0097] (2) Control the material temperature in the suspension calciner at 1000°C;

[0098] (3) A reduction reaction occurs between the reducing gas and the calcined mat...

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Abstract

The invention relates to a fluidized calcination device and method for treating high-iron low-aluminum coal series kaolinite. The device comprises a feed bin, a gas burner, a suspended preheater, a suspended calcination unit, a cyclone separator, an iron removal reductor, an electric magnetic iron remover, a whiteness monitor, a material cooler and a Roots blower. The method comprises the following steps: putting the raw material high-iron low-aluminum coal series kaolinite in the feed bin, preheating the material subjected to primary separation in the suspended preheater, calcining in the suspended calcination unit, and carrying out reduction reaction in the iron removal reductor; and cooling to normal temperature, carrying out magnetic separation in the electric magnetic iron remover to remove magnetic iron minerals, inspecting by the whiteness monitor to obtain the acceptable product, and cooling to normal temperature. The device can efficiently treat high-iron coal series kaolinite, has the advantages of sufficient calcination process and high product whiteness, can effectively remove iron tramp minerals in the raw material, and can easily implement large-size industrial production.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to a fluidized calcination device and method for processing high-iron and low-aluminum coal series kaolin. Background technique [0002] Coal-measure kaolin is a solid waste produced during coal mining and washing. It is mainly composed of kaolinite and carbonaceous. Coal-measure kaolin has become a unique kaolin resource in my country; coal-measure kaolin is mainly composed of kaolinite minerals Mainly, followed by a large amount of impurity components such as combustible carbon, organic matter and iron minerals. Coal series kaolin can obtain calcined kaolin with a certain whiteness after dehydration, decarburization, and iron removal. Calcined kaolin is characterized by its unique Its performance is widely used in papermaking, paint, coating, rubber, cable, ceramics and other industries. At the same time, calcined kaolin, as a raw material for some new resourc...

Claims

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Application Information

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IPC IPC(8): C01B33/40
CPCC01B33/40C01P2006/60
Inventor 韩跃新袁帅李艳军李文博
Owner NORTHEASTERN UNIV
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