Secondary treatment of coal gangue to prepare fertilizer project
As solid waste generated during coal mining and processing, coal gangue has shown great application potential in many fields. Under the current dual needs of resource conservation and environmental protection, the effective utilization of coal gangue has become one of the important measures to promote sustainable development, and it is also an important way to practice the concept of green development and realize resource recycling. We should actively explore innovative technologies and methods to continuously improve the utilization level of coal gangue in the field of building materials.
Project Overview
The user is a domestic solid waste resource recycling company. The project is secondary treatment of coal gangue to prepare fertilizer.The entire production line of this project was designed by Liming Heavy Industry, which fully combines the user's on-site conditions, has a reasonable and compact layout, a small footprint, and low investment costs.
Processing materials: coal gangue, diatomaceous earth, shale
Finished product use: fertilizer
Equipment used: two sets of MTW European type grinding mills
The application of coal gangue
Agriculture
(1) Fertilizer preparation: Coal gangue contains a large amount of organic matter, accounting for about 15% to 40%, which can supplement the organic matter content of the soil. The N, P, and K it contains are the main elements for making fertilizers.
(2) Soil improvement: The trace elements such as Zn, Cu, Co, and Mn required for plant growth contained in coal gangue are 2 to 10 times higher than those in ordinary soil, and it contains a large amount of carbonaceous shale, siltstone and organic matter. Therefore, it can be used to make microbial fertilizers, improve soil quality, increase soil fertility, and promote plant growth.
Building
(1) Cement production: The main components of coal gangue are silicon-aluminum components, which have potential volcanic ash activity. Under appropriate physical and chemical effects, the silicate minerals in the gangue can be stimulated to generate hydrated calcium silicate and hydrated calcium aluminosilicate, etc. These hydration products can improve the strength of gangue cement.
(2) Production of concrete aggregate:
Partial or complete replacement of natural aggregate with gangue to prepare concrete. Its use as aggregate can greatly alleviate the supply pressure of natural aggregate and effectively save natural resources such as natural sand and gravel.
(3) Making bricks with gangue: Gangue has certain plasticity and sintering properties. After homogenization, crushing, purification and aging, it can be used to make bricks.
Burning
Gangue heating and power generation: Gangue power generation can maximize the economic, environmental and social benefits of gangue. Its use in power generation can not only effectively solve the problem of long-term and large-scale storage of gangue resources, but also help protect the environment. At present, the fluidized bed combustion power generation and heating technology based on inferior coal resources and gangue is developing rapidly.
Recycling
The materials recovered from coal gangue include carbon, aluminum compounds, iron compounds, silicon compounds, rare metal elements, etc. In some areas, coal gangue is associated with a variety of trace rare metals, such as lithium, gallium, titanium, rare earth, etc.
Equipment selection
After nearly 40 years of technological precipitation, Liming Heavy Industry MTW series European type grinding mill has absorbed the latest European grinding concept and realized a technological revolution in industrial grinding mills. It has a number of independent patent technology property rights. Since it was put on the market, it has passed a number of scientific and technological achievements. It has become the best replacement product for traditional raymond mills, pendulum mills and ball mills, and the preferred equipment for large-scale mineral plant construction.
Technical advantages
1. Mature and stable equipment
Adopting seven core patents, nearly 40 years of mill manufacturing experience; four generations of grinding mills have matured and transformed, and pendulum mills are high-quality products in the industry.
2. Bevel gear overall transmission
Accurate transmission ratio, strong power, high efficiency, large output, and low energy consumption. The sinking design has stable operation, low vibration and low noise.
3. The transmission system is lubricated with thin oil
The main shaft transmission system and the fan transmission system are both lubricated with thin oil, with an oil change cycle of up to 4 months and less maintenance frequency.
4. New frequency conversion powder classifier
Adopting a new hanging cage powder classifier, the powder selection efficiency is high, the frequency conversion control, and the fineness adjustment is more precise.
5. Economical investment and environmental protection
Small footprint, simple structure layout, strong set-up, low infrastructure cost, short construction period, and fast capital recovery. The finished product has low pollution and high whiteness. The entire system operates under negative pressure without dust spillage, meeting the latest national environmental protection requirements.
6. Integrated comprehensive solution
Provide integrated comprehensive solutions such as design, supply, construction, and service.
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