HLM vertical mill can make marble tailings into 100-400 mesh ore powder, which is used in 10 major industrial fields. There are many models of HLM vertical mills, which are suitable for investment in marble tailings recovery projects with different production capacity requirements. The production of artificial marble from ultra-fine tailings only needs to be installed on a vertical mill system with a secondary classification system.
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Top 10 Applications of Marble Tailings
The marble tailings waste residue can be processed by HLM marble tailings powder vertical mill to achieve ten purposes of its recycling application. The specific uses are as follows:
1. For the production of calcium carbonate
After the marble tailings are washed with water, dehydrated and screened, the marble tailings with a particle size of more than 50 mm are used as raw materials for producing light calcium carbonate or heavy calcium carbonate.
The main component of marble waste is calcium carbonate, and light calcium carbonate can be prepared by conventional calcination-digestion-carbonization process. Lu et al. used a hydrothermal treatment process in an alkaline solution to reduce the concentration of colored impurity ions in the powder through the dissolution-recrystallization process of the marble powder, and prepared a high-brightness calcium carbonate powder, which is expected to be applied to the large-scale utilization of marble waste. .
2. For the production of imitation stone coatings
Stone-like coatings are mainly composed of natural waste rock powder, binders, additives and other proportions. According to the proportions of stone powders of different particle sizes and different colors, stone-like coatings that meet different requirements are formed. Marble tailings and waste residues can be ground to a certain fineness and used as fillers for imitation stone coatings, and the addition ratio can be as high as 60%-70%. This is a relatively efficient waste residue treatment method and is widely used.
3. For the production of artificial granite
Artificial granite is made of marble scraps and stone powder as the main raw materials. Mosaic, shell, glass and other materials can also be added as embellishments. Organic resin is used as a binder. It is formed by vacuum stirring, high pressure vibration, and then cured at room temperature. synthetic stone. Guangxi Hezhou is rich in marble resources and is the largest heavy calcium carbonate powder production base and artificial granite production base in my country. Utilize" green recycling industry chain.
4. For the production of concrete
Using waste marble as aggregate or partially replacing cement in concrete can improve the mechanical properties of concrete, mainly including wear resistance, compressive strength, flexural strength, etc. The replacement amount (relative to cement) is from 5% to 40% not wait.
5. Used in the production of desulfurizers
Using waste marble powder to prepare desulfurizer, this desulfurization method has high efficiency, and the cost of producing desulfurizer is also greatly reduced, but this method has higher requirements on the purity of waste marble powder.
6. For the production of machine-made sand
In recent years, the state and local governments have successively issued a number of policies to encourage the use of tailings and wastewater to produce machine-made sand. Marble tailings with a particle size of 5mm to 50mm are used as raw materials for the production of machine-made sand.
7. Used in the production of soil conditioners
The alkalinity of the marble waste residue is used to neutralize the soil with strong acidity, and the soil is basically not damaged. Using marble powder and rice husk ash as soil additives can improve soil expansion rate and expansion pressure.
8. For the production of composite materials
Mixing a certain amount of marble waste with ceramics or polymers can be studied to produce composites. Chaudhry et al. Using marble waste powder to fill glass fibers, the flexural strength and flexural modulus of the composites were significantly improved after adding 20 wt% marble powder to the composites. Nayak et al. Wear-resistant hybrid composites were prepared using marble powder as auxiliary filler in glass polyester material system. Studies have shown that adding marble powder filler helps to reduce the wear rate of composites and improve their wear resistance.
9. For the production of aragonite whiskers
Quicklime obtained by pretreatment and calcination of marble tailings was used as raw material, magnesium chloride was used as crystal control agent, and the concentration of MgCl2 was 0.2 mol/L at a temperature of 80 °C. , when the amount of quicklime is 6g/L, aragonite whiskers with a length of 40~50μm, a diameter of 2~3μm and an aspect ratio of 13~18 can be prepared.
10. Used as a filter material for wastewater treatment
There are many methods of chemical treatment commonly used in the treatment of industrial wastewater. Among them, there are three kinds of filter media in the filtration and neutralization method (suitable when the acid concentration is not too large): limestone, marble and dolomite. If it is processed, it is selected to be used as a filter material, but it can be used to the best of its ability.