CN103896478A

CN103896478A - Novel method for preparing HK ultra-fine fly ash glass beads

Info

Publication number: CN103896478A
Application number: CN201210582241.2A
Authority: CN
Inventors: 代戈; 王力
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-12-28
Filing date: 2012-12-28
Publication date: 2014-07-02

Abstract

The invention provides a novel method for preparing HK ultra-fine fly ash glass beads. The preparation method comprises the following steps: 1, selectively blending coal according to the coal quality; 2, pulverizing the blending coal and drying the pulverized coal; 3, feeding the pulverized coal to a furnace to combust; and 4, filtering and collecting smoke to obtain the HK ultra-fine fly ash glass beads. Compared with the fly ash glass beads prepared by secondary processing in the prior art, the preparation method provided by the invention has the advantages that a lot of costs, soil and personnel are saved, all products are spherical bodies, and large in superficial area, and have excellent functions such as high activity, good electrical insulating property, high and low temperature resistance, corrosion resistance, abrasive resistance, radiation protection, sound insulation, heat insulation, high comprehensive strength and good mobility, nontoxicity. The HK ultra-fine fly ash glass beads prepared by using the preparation method provided by the invention can be widely applied to filling and improving functions of a plurality of fields such as plastics, rubber, coatings as well as insulated and wearable materials.

Description

A kind of preparation method of novel HK superfined flyash glass microballon

Technical field

The present invention relates to one taking coal as raw material, through special process, the preparation method of inorganic powder-a kind of novel HK superfined flyash glass microballon is prepared in processing.Belong to flyash high value added utilization field.

Background technology

Now market upper glass microballon mainly divides two kinds, and a kind of is synthetic alkali lime borosilicate glass microballon taking U.S. 3M as representative; Another kind is through dry method, wet method or the dry wet sillico aluminate glass microballon that obtains in conjunction with sorting the flyash producing from power plant.Powder coal ash glass-microballons is according to proportion size, and to the heavy pearl of the title of proportion > 1, the title of proportion < 1 floats pearl, is generally referred to as microballon.Using feed coal as coal-burning power plant is a kind of mixture, therefore the flyash composition difference of its generation.Only have in the part coal flyash that 1200 DEG C of burnings produce through the coal-powder boiler > of power plant and just contain spherical glass microballon.Conventionally float pearl output and account for fly ash content 0.2-1.0%, heavy pearl accounts for 20-60%, also has the random vitreum of 40-80%.No matter adopt dry type, wet type or dry wet combined type to extract powder coal ash glass-microballons, be all to adopt secondary processing method, exist and need land occupation, investment plant and equipment, increase the problems such as personal expenditures, and the powder coal ash glass-microballons weak effect that aforesaid method sub-elects, efficiency is low, and output is few, poor activity, apparatus processing is destroyed again part microbead glass spheroid, causes production cost high, few in the practical application in market.

The invention provides a kind of coal directly processes superfined flyash glass microballon method through special process, thoroughly address the above problem, and the powder coal ash glass-microballons of producing is original state, be different from the glass microballon that fly ash in electric power plant sub-elects, it is all spheroplast, surface-area is large, have active high, electrical insulating property good, high-low temperature resistant, corrosion-resistant, wear-resisting, radioprotective, sound insulation, thermal insulation, ultimate compression strength are high, good fluidity, the excellent function such as nontoxic.This product can be widely used in the filling of the multiple fields such as plastics, rubber, coating, adiabatic heat-insulation and high-abrasive material and improve function.

Summary of the invention

1. the ature of coal of determining the feed coal of producing powder coal ash glass-microballons requires: moisture 8-18%, ash content 5-25%, volatile matter 30-38%, sulphur content < 1.5%, grindability index > 40,40 millimeters of raw coal size <, 1250 ° of C of ash fusion point >.

2, determine this coal drying and powder process requirement: moisture 1-4%, granularity 5-80 micron.

3, determine that coal dust is prepared into the processing requirement of superfine fly ash micro-bead through coal-powder boiler or vapourizing furnace burning: coal dust sprays people's burner hearth by nozzle; 1400 DEG C of temperature > in stove; Pressure > 1.4MP; Flue gas filters collection and obtains HK superfined flyash glass microballon solid through dry method dust strainer.

4, determine that its main component of HK superfined flyash glass microballon requires:

5, determine HK superfined flyash glass microballon electron-microscope scanning figure as shown in Figure 1.

6, technological process: be dried → vapourizing furnace burning → smoke filtration collection → HK superfined flyash glass microballon product of feed coal → grinding machine abrasive dust.

Principle: 3C (coal)+O2+H2O (steam) → 3CO+H2 flue gas is exactly superfined flyash glass microballon

Four, embodiment

By moisture content 9.6%, ash content 11.5%, volatile matter 35.3%, sulphur content 0.42%, it is dry that granularity < 40mm coal drops into grinding machine abrasive dust, and then, by moisture 1.9%, granularity≤90um coal dust and oxygen, water vapour are sent into 1550 DEG C of temperature, in pressure 1.8MP vapourizing furnace, gasify, in flue, collect and obtain HK superfined flyash glass microballon with dry method dust strainer.Its HK superfined flyash glass microballon main component:

HK superfined flyash glass microballon particle diameter table with test results

HK superfined flyash glass microballon particle diameter test result as shown in Figure 2.

Claims

1. preparing superfine fly ash micro-bead main raw material is coal, can select all coals and coal blending.

2. preferentially select dynamic blending coals.

3. according to claim 1, it is characterized in that the ature of coal of coal and coal blending: moisture 8-18%, ash content 5-25%, volatile matter 30-38%, sulphur content < 1.5%, grindability index > 40,40 millimeters of raw coal size <, 1250 ° of C of ash fusion point >.

4. coal according to claim 3 or coal blending are carried out powder process with dry, and it enters stove coal dust: moisture 1-4%, granularity 5-80 micron.

5. according to claim 4, it enters stove coal dust and sprays people's hearth combustion by nozzle, 1400 ° of C of fire box temperature >, pressure > 1.4MPa.

6. the type of furnace is coal-fired coal-powder boiler, vapourizing furnace.

7. according to claim 5, the flue gas producing after coal dust firing, its flue gas filters and collects through dry gas cleaning strainer, obtains HK superfined flyash glass microballon.

8. its HK superfined flyash glass microballon main component according to claim 7:

Chemical constitution SiO2 Aｌ2O3 CaO Fe2O3 SO3 Loss on ignition Content % 40-60 15-33 4-15 2-8 ＜0.5 ＜3

HK superfined flyash glass microballon physical property: color is greyish white, glass spheres content > 96%, particle diameter 0.0-15um, surface-area > 2000cm ²/ g, intensity activity index > 80%.

9. according to claim 5, the electron-microscope scanning of HK superfined flyash glass microballon as shown in Figure 1.