How to produce ultra-white kaolin from coal gangue? Guilin Hongcheng provides a complete set of equipment for calcining kaolin from coal gangue (there have been successful installations). However, some customers (without equipment) used coal gangue to calcine kaolin to produce kaolin because they did not understand the process, and found that the whiteness was not enough, so they asked Guilin Hongcheng what process and equipment to use. Here, based on the knowledge of expert training, Guilin Hongcheng will give a general answer to the manufacturers who have doubts and are preparing to install the equipment.
How to produce ultra-white kaolin from coal gangue
1. Requirements of coal measure kaolin for coal gangue
First of all, it is necessary to analyze the raw materials. Not all coal gangue is suitable for calcining kaolin to produce kaolin. When we obtain coal gangue development resources, we need to ask professional analysis institutions or companies to analyze raw materials, and then select suitable equipment according to the obtained laboratory reports.
To put it simply, first look at the aluminum-silicon ratio in coal gangue. The aluminum-silicon ratio is > 0.5, indicating that the AL2O3 composition is high, so it is suitable for calcining to obtain kaolin.
| Aluminum to silicon ratio | Situation Analysis |
| 0.3-0.5 | The content of silicon and aluminum is relatively moderate, and the mineral components are mainly kaolinite and illite. |
| ＜0.3 | The content of aluminum is much less than that of silicon, and the main mineral components are quartz, feldspar, calcite, and siderite. |
| ＞0.5 | The aluminum content is much higher than the silicon content, and the mineral composition is mainly kaolinite, which has good plasticity and swelling phenomenon, and can be used to develop coal-measure kaolin. |
If the carbon content of coal gangue is as high as 20% or more in the chemical element table, it means that the calorific value is high, and it is suitable for fuel.
| carbon content | Situation Analysis |
| ＜4% | Used in cement mixture, concrete aggregate and road subgrade. |
| 4-6% | Used in cement mixture, concrete aggregate and road subgrade. |
| 6-20% | It can be used in cement production (non-carbonization treatment, calcined clinker), coal gangue brick making and other industries. |
| ＞20% | It has high carbon content and high calorific value and can be used as fuel. |
Therefore, due to the analysis of the different components of coal gangue in various regions, such as carbon content, silicon and aluminum content, coal gangue can be applied in various fields. Guilin Hongcheng does not directly recommend equipment as soon as it receives customer consultation. This is an act of irresponsibility to the customer. Instead, let customers go to the laboratory analysis of coal gangue, and then make a decision.
2. How to produce ultra-white kaolin from coal gangue
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With the coal gangue composition test table data provided by the customer, it is determined that the aluminum-silicon ratio is >0.5, then it can be determined that the coal gangue is suitable for calcining kaolin. Then "how to produce ultra-white kaolin from coal gangue?".
Let's take a look at the process and requirements. Coal gangue calcined kaolin requires a kaolin content of more than 97%, so it is necessary to remove impurities to achieve an iron content of no more than 0.5% to produce ultra-white kaolin. The whiteness of the obtained kaolin is sufficient to be used in the fields of plastics, medicine, ceramics, refractories, papermaking, coatings and the like. The gangue calcined kaolin process is through pulverizing coal gangue 200-325 mesh → forming → calcining → crushing → grinding to a finished product of 325 mesh or finer. Guilin Hongcheng's HLM coal gangue vertical mill conducts iron removal process before the coal gangue is milled, which effectively removes iron components, and then uses a calciner to remove carbon components. Corresponding processes such as centrifugal separation and ultra-white calcination can be carried out to remove boehmite, iron and titanium mineral impurities in coal gangue to obtain ultra-white kaolin.
