The mining rate is about 5% ~ 10%, and the gangue Capacity of raw coal washing in coal washing plant is 18% ~ 20%, which can realize the green development of coal. There are few high-value utilization of coal gangue. The six key directions to realize the high-value utilization of solid waste coal gangue are of far-reaching significance to the resource-saving society.
01 Preparation of Kaolin from coal gangue
The main direction of comprehensive utilization of high value coal gangue is to prepare kaolin. Nowadays, there are many projects of calcining kaolin from coal gangue. Coal gangue produces ultra-fine powder through GKLM super-fine vertical grinding mill. It can be used in plastics, rubber, aerospace, wires and cables, coatings, inks, food additives, cosmetics, pesticides and other fields.
02 Preparation of aluminum based chemical raw materials from coal gangue
The preparation of aluminum based chemical raw materials from coal gangue is one of the methods of comprehensive utilization of high-value coal gangue. The valuable elements such as silicon, aluminum and iron contained in coal gangue are dissolved after high-temperature roasting, so as to prepare aluminum hydroxide or alumina.
03 Preparation of building bricks from coal gangue
The preparation of building bricks is the way for the utilization of most solid wastes, and the comprehensive utilization of high-value coal gangue is no exception. Coal gangue can be used to produce brick after homogenization, crushing, purification and aging. It is a good material for preparing solid brick, permeable brick, multi idle rotation, non fired brick, hollow brick and so on.
04 Preparation of cement from coal gangue
The comprehensive utilization of high-value coal gangue is suitable for cement, which can effectively improve the burnability of cement raw meal, improve the stability of thermal system and the quality of cement. GKLM superfine vertical mill can effectively grind coal gangue to 325-2500 mesh, which can not only improve the utilization rate of coal gangue, but also promote the activity of cement.
05 Preparation of porous ceramics from coal gangue
The preparation of porous ceramics from coal gangue is a new way for the comprehensive utilization of high-value coal gangue. Porous cordierite ceramics and mullite porous ceramics are fired from coal gangue. It not only has good seismic resistance, very low coefficient of thermal expansion and high compressive strength, but also has many advantages, which has attracted much attention.
06 Preparation of environmental materials from coal gangue
The high value coal gangue is composed of coal gangue minerals, which is comprehensively utilized. The coal gangue is treated with GK vertical roller mill or GKLM super-fine vertical grinding mill as a cheap adsorbent for water treatment.