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A method for preparing high-quality kaolin by high-efficiency calcination of coal gangue by increasing oxygen

A technology of coal gangue and kaolin, which is applied in the field of high-quality kaolin prepared by high-efficiency calcination of coal gangue, which can solve the problems of low quality and poor performance of kaolin, and achieve quick results, low sieve residue, and good economic benefits.

Active Publication Date: 2018-03-09
山西晋坤矿产品股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problems of raw materials, processes and equipment used in the existing calcined kaolin, resulting in the poor performance and low quality of the produced kaolin, the present invention provides a method for preparing high-quality kaolin by increasing the oxygen of coal gangue and efficiently calcining

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  • A method for preparing high-quality kaolin by high-efficiency calcination of coal gangue by increasing oxygen
  • A method for preparing high-quality kaolin by high-efficiency calcination of coal gangue by increasing oxygen
  • A method for preparing high-quality kaolin by high-efficiency calcination of coal gangue by increasing oxygen

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Embodiment 1

[0030] Embodiment 1: A method for preparing high-quality kaolin by increasing the aeration of coal gangue with oxygen and high efficiency, including hand-selected ore washing, crushing and crushing, ultra-fine grinding, drying and breaking up, calcining and cooling, breaking up and grading, specifically including the following steps:

[0031] (1) Hand-selected ore washing: remove iron-titanium-infected raw materials and other impurities in the raw ore stockyard, then wash with water to remove coal ash and soil on the surface of the raw ore, and manually crush until the ore particle size is ≤ 200mm;

[0032] (2) Crushing and crushing: choose ore with a Mohs hardness of 3-5, use a conventional hammer crusher to crush the ore to a particle size of ≤15mm, and then use a hurricane mill to crush it to make the particle size 45 microns or 325 mesh;

[0033] (3) Ultra-fine grinding: the material crushed to 325 mesh is mixed with water to make slurry, the slurry concentration is 40-50%,...

Embodiment 2

[0041] Example 2: A method for preparing high-quality kaolin by increasing the oxygenation of coal gangue. When calcining and cooling, an internal heating type rotary kiln is used, and the calcining temperature is controlled at 1000°C. After 56 minutes of calcining, the hot material is cooled by exhaust and transported under negative pressure. The kiln head of the internal heating rotary kiln is equipped with a combustion chamber, a burner is installed in the combustion chamber, a combustion-supporting fan is installed at the front end of the combustion chamber, and an oxygen supply fan is installed at the burner. The burner is a natural gas burner. The frequency of the oxygen fan is 45Hz. All the other methods are with the method described in Example 1.

Embodiment 3

[0042] Example 3: A method for preparing high-quality kaolin by increasing the oxygenation of coal gangue. When calcining and cooling, an internal heating rotary kiln is used, and the calcining temperature is controlled at 1050°C. After 50 minutes of calcining, the hot material is cooled by exhaust and transported under negative pressure. The kiln head of the internal heating rotary kiln is equipped with a combustion chamber, a burner is installed in the combustion chamber, a combustion-supporting fan is installed at the front end of the combustion chamber, and an oxygen supply fan is installed at the burner. The burner is a natural gas burner. The frequency of the oxygen fan is 50Hz. All the other methods are with the method described in Example 1.

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Abstract

The invention belongs to the technical field of treatment of coal gangue, and provides a preparation method for high-quality kaolin through oxygen-increased highly-efficient calcination of coal gangue. The preparation method for the high-quality kaolin through oxygen-increased highly-efficient calcination of the coal gangue provided by the invention is to solve the problems like poor performances, low quality and high energy consumption of produced kaolin due to the problems of raw materials, process and equipment used for conventional calcined kaolin. The method comprises the following steps: hand sorting and ore washing, crushing and grinding, superfine ore grinding, drying and beating scattering, calcining and cooling, and beating-scattering grading. According to the invention, a combustion chamber is arranged in a kiln head of an internally-heated type rotary kiln; a combustion device is arranged inside the combustion chamber; a combustion-supporting air blower is arranged at the front end of the combustion chamber; and an oxygen-supply blower is arranged in the combustion chamber. The preparation method provided by the invention has the following advantages: decarbonization is carried out at a low temperature, so a product with high granularity, low sieving residue and low wear consumption is obtained, and the influence of production on the environment is reduced; a technology of simultaneously realizing oxygen-increased combustion assistance and calcination activation is developed, so highly-efficient decarbonization, energy conservation and efficiency improvement are realized; meanwhile, temperature-controlled calcination is realized, so partial overheating is avoided, and obtained kaolin has improved whiteness and fineness and reduced wear value.

Description

technical field [0001] The invention belongs to the technical field of coal gangue treatment, and in particular relates to a method for preparing high-quality kaolin by increasing oxygen and efficiently calcining coal gangue. Background technique [0002] At present, the problems existing in the domestic coal series kaolin production line are mainly manifested in two aspects, one is the ultra-fine material, and the other is the calcination process and equipment of the material. These two aspects all have the problems of high production cost, low output and poor operation stability. One of the main characteristics of coal gangue (coal series hard kaolinite) is that it is subjected to diagenesis during the formation of the ore, and the ore is mostly sedimentary rock. During the processing, a series of processes such as crushing, crushing, and ultra-fine crushing are required to reduce the lumpiness and fineness of the raw ore. Among them, after crushing to 325 mesh, due to t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/26
CPCC01B33/26C01P2004/61C01P2006/65Y02P20/10
Inventor 曹永新李亚军李文杰刘继文任向上冯厚朱世海李江
Owner 山西晋坤矿产品股份有限公司
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