Drying-free granulation treatment medicament for wet coal slime

Abstract

The invention belongs to the technical field of coal separation, and discloses a drying-free granulation treatment medicament for wet coal slime. The drying-free granulation treatment medicament for wet coal slime comprises a water-absorbent resin, a dehydration aid, a drying aid, and a powder flow aid, and the mass ratio of the water-absorbent resin, the dehydration aid, the drying aid, and the powder flow aid is (5 to 10):(0.5 to 5):(0.5 to 5):(0.3 to 5). The drying-free granulation treatment medicament for wet coal slime is added to the wet coal slime and thoroughly mixed and crushed, so that the wet coal slime can lose water and become embrittlement, and the purpose of removing stickiness is achieved, the medicament is non-toxic and has no irritating odor, usage is less, safety is high, energy saving and efficient effects are achieved, no exhaust gas is emitted, all-weather using is possible, after the coal slime treatment is completed, the coal slime can be directly used as thermal coal for combustion after being screened by a screening system.

Description

technical field [0001] The invention relates to the technical field of coal separation, in particular to a drying-free granulation agent for wet coal slime. Background technique [0002] Coal slime mainly comes from by-products produced during coal production and washing. There are many ways to utilize coal slime as a resource, most of which are mixed with thermal coal and burned directly to generate electricity. However, the sticky-wet characteristics of coal slime bring many difficulties to the transportation and storage of coal slime, and because of this characteristic, coal slime is difficult to be directly burned as thermal coal in thermal power plants. In order to solve the problems caused by sticky and wet coal slime, drying methods are used to treat coal slime at home and abroad to make it dehydrated and embrittled, which is convenient for subsequent processing. [0003] Most of the current coal slime drying technologies include natural air drying, drum high-temper...

AI Technical Summary

Problems solved by technology

[0003] Most of the current coal slime drying technologies include natural air drying, drum high-temperature drying technology, and microwave drying technology, but these drying technologies have some disadvantages, such as natural air drying. No need to dry; spreading a thin layer to dry requires a large area of ​​cement ground and surrounding enclosures, which cannot be changed due to weather constraints. The biggest disadvantage is that the coal slime is fine powder after drying. In windy weather, fine coal powder Flying everywhere; in rainy weather, it is washed by the rain and flows everywhere, not only the wet slime is lost in large quantities, but also causes long-term serious pollution to the surrounding environment

Another example is that in the drum drying technology, in order to improve the drying efficiency, most of the hot air stoves are used to generate high-temperature hot air at 650°C-800°C for drying. The temperature of the hot air at the back of the drum and the oxygen content in the hot air must be strictly controlled. Low, fine dust particles, easy to catch fire, once it reaches the explosion limit, it is easy to cause an explosion, and there are potential safety hazards. At present, most coal washing plants dare not use it

Although microwave drying is suitable for the dehydration and drying of wet sticky coal slime, the generation of microwave requires precious secondary energy—electric energy. The removal of 15% moisture per ton of wet coal slime requires more than 135Kw of electric energy, and the drying cost of wet coal slime per ton It is more than 80 yuan / ton, which is 3-4 times that of other coal-fired drying, and the cost of energy consumption is high. It is putting the cart before the horse to use converted high-quality secondary energy to dry low-quality primary energy

[0004] It can be known from the above that the drying method not only consumes a lot of energy, but also causes a lot of pollution.