CN1323273C

CN1323273C - Equipment and technological process for preparing dry boric sludge

Info

Publication number: CN1323273C
Application number: CNB2003101052166A
Authority: CN
Inventors: 范广权; 张振
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-11-28
Filing date: 2003-11-28
Publication date: 2007-06-27
Anticipated expiration: 2023-11-28
Also published as: CN1546930A

Abstract

The present invention relates to a device and a technological method for preparing dry boric sludge. For the device, a layered air flow drying tower is composed of a central transmission main shaft (1), flue material trays (2), a heat insulating housing (3), a material conveying device (4), a purified air inlet (5), a damp discharge pipe (6), a flue gas inlet pipe (7), a flue gas outlet pipe (8), a speed reducer (9), a gearbox (10), a wet material inlet (11) and a product outlet (12). The present invention is characterized in that the flue gas inlet pipe (7) is installed on the upper part of the heat insulating housing (3); the flue gas outlet pipe (8) is installed on the bottom of a tower body. The preparation method has the point that flue gas and wet materials of boric sludge gradually move downwards in the same direction from the flue material tray on the uppermost layer. The temperature of the flue gas inlet is controlled from 820 DEG C to 830 DEG C. The device and the technological method for preparing dry boric sludge, which are provided by the present invention, can really and effectively utilize boric sludge discarded for a long time in the past; thus, the economic benefit of enterprises for producing boracic acid and borax and relevant steel plants can be improved, and the problem that boric sludge pollutes the environment can be solved.

Description

A kind of equipment and process thereof for preparing dry boron mud

Affiliated technical field

The present invention relates to boron mud drying means and equipment, be specifically related to the drying equipment and the process thereof of the byproduct boron mud that produces by producing boric acid and borax process.

Background technology

Boron mud is the byproduct (mine tailing) that some chemical plant produce boric acid and borax, wherein contains Fe, B ₂O ₃, MgO, CaO, Al ₂O ₃Deng composition, 70～800,000 tons of products will there be every year in China.For this byproduct, never find suitable purposes for many years, its processing method is all taked take up an area of to pile up and is filled out the hole and stores, and has both consumed great amount of manpower, transport power, financial resources, seriously influences enterprise's production development, simultaneously contaminated environment seriously again.

In order to address the above problem, for many years, researchers have carried out a large amount of explorations and test, have obtained gratifying effect, as: Lingyuan Iron ﹠ Steel Corp. cooperates with the Northeastern University, test and the shaft roasting and the blast furnace process experimental study of iron ore pellets interpolation boron mud have been carried out, its result shows, adopts boron mud powder to do pelletizing additive, has not only improved the pellet cold strength, improve the chemical composition and the metallurgical performance of pellet again, also improved the roasting technique of shaft furnace pelletizing; Blast furnace process boracic mud ball nodulizing, furnace condition anterograde improves, and slag iron temperature improves, and coke ratio reduces, and its whole economic efficiency is fairly obvious.

Along with boron mud utilizes the solution of approach, be connected to and what come is how to provide a kind of boron mud is worked into the boron mud fine powder that granularity and moisture all are applicable to agglomerates of sintered pellets production needs, become anxious problem to be solved again.Because the moisture height of boron mud, the dehydration difficulty has certain viscosity again.For many years, numerous scientific research institutions is arranged, the researcher adopts various ways, as: mechanical drying, natural airing or bottom drier drying etc. all fail to address this problem effectively.

Summary of the invention

The objective of the invention is: the laminar pneumatic conveying drying tower that utilizes prior art, improving becomes the boron mud drying equipment that the present invention needs, and develop the process of boron mud drying, the boron mud of the product drying that obtains can be reached fully can be processed into granularity and moisture all is applicable to the raw material that agglomerates of sintered pellets production needs.

Boron mud drying equipment of the present invention, mainly by center transmission main shaft (1), flue charging tray (2), insulated case (3), handler (4), inlet (5) purifies air, humidity discharging pipe (6), waste gas inlet pipe (7), flue gas outlet pipe (8), reductor (9), gearbox (10), wet feed inlet (11) and products export (12) constitute, and its main points are that waste gas inlet pipe (7) is contained in insulated case (3) top, flue gas outlet pipe (8) is contained in the bottom of tower body (3), goes up the thickness of the thickness of three layers of flue charging tray (2) greater than each flue charging tray (2) below three layers most.

The method of boron mud drying of the present invention is to follow these steps to carry out in above-mentioned improved laminar pneumatic conveying drying tower:

1) boron mud wet feed is added the charging tray of upper strata from tower top feeding mouth,

2) when adding boron mud wet feed, send into high-temperature flue gas to the superiors' tower tray from waste gas inlet pipe (7), and move down gradually, the flue gas outlet at the bottom of the tower is discharged at last,

3) material moves down the boron mud after the final drying under heating state and under the promotion of handler gradually along Archimedes spiral

Product is discharged from the bottom product outlet,

4) moisture of dry run is taken away by the air rising that the inlet that purifies air under the tower enters, and is discharged naturally by the humidity discharging pipe of cat head at last.It is characterized in that flue gas and boron mud wet feed begin equidirectional moving down from the superiors' flue charging tray, the flue gas inlet temperature is controlled to be 820 ℃～830 ℃, the wet feed feeding quantity be 1.5～2.5 tons/time, purifying air is natural feeding.

The most significant advantage of the present invention and benefit are:

Because the present invention changes into tower top with the flue gas import of the laminar pneumatic conveying drying tower of prior art at the bottom of tower, flue gas outlet is changed into tower bottom from tower top, make that high-temperature flue gas and material are equidirectional to flow, broken the usual manner that high-temperature flue gas and material adverse current move in the prior art; The thickness that existing drying tower is gone up three layered material dishes most changes 12mm into by original 10mm in addition, and its material changes boiler plate into; Also having the important point is that the present invention has sought out that to make the dry at a high speed temperature of boron mud be 820 ℃～830 ℃.Because above-mentioned three part important breakthroughs enter at the bottom of tower thereby thoroughly solved original high-temperature flue gas, cause boron mud bonding charging tray from the tower discharge, along with operation is carried out, cause the handler load to strengthen, even tensile phenomenon occurs, the predicament that drying equipment can't be turned round.

Because the technological break-through among the present invention, thoroughly solve the raw material problem of producing boron mud fine powder, really made discarded over a long period of time boron mud, obtained effective utilization, not only improve the economic benefit of producing boric acid and borax plant, correspondingly also improved the economic benefit of large quantities of steel plant; Bigger benefit is to have solved the pollution problem of boron mud to environment.

Description of drawings

Fig. 1 is a laminar pneumatic conveying drying tower structure schematic diagram of the present invention;

Fig. 2 is a flue charging tray front view among Fig. 1;

Fig. 3 is the vertical view of Fig. 2.

Among the figure 1, the center transmission main shaft, 2, the flue charging tray, 3, insulated case, 4, handler, 5, inlet purifies air, 6, humidity discharging pipe, 7, waste gas inlet pipe, 8, the flue gas outlet pipe, 9, reductor, 10, gearbox, 11, wet feed inlet, 12, products export, 13, flue tube.

The specific embodiment

The 1 couple of the present invention laminar pneumatic conveying drying tower that is used for dry boron mud describes in conjunction with the accompanying drawings: the lagging casing of tower (3) is a cylindrical shape, material is selected A3 steel external application rock wool heat-preservation for use, a center transmission main shaft (1) is equipped with in cylinder center, the upper end is contained on the fixed bearing block, following two ends are connected with the shaft coupling of gearbox (10), gearbox (10) is connected with reductor (9), gearbox (10) is selected Worm and Worm Gear Driving for use, gearbox (model), in the middle of center power transmission shaft (1), eight layers of flue charging tray (2) are housed, going up most three layers selects for use the thick boiler plate of 12mm to make, basecoat is the thick steel plate of 10mm, is equipped with to be used to promote the handler (4) that material moves on charging tray (2); Be welded with waste gas inlet pipe (7) on lagging casing (3) upper portion side wall, its mouth of pipe that stretches in the lagging casing (3) is connected on the side of last layer flue charging tray (2) by tangent line, and flue gas outlet pipe (8) is welded at the bottom of the tower; Wet feed inlet (11) is installed in tower body top, and products export (12) is welded at the bottom of the tower, and two inlets (5) that purify air are arranged, and is welded on symmetrically on the sidewall of insulated case (3) bottom, and a humidity discharging pipe (6) is arranged between the top of tower.

The processing step of material boron mud drying is: with wet boron mud, humidity 30%＜, rise to the porch through elevator, through tripper equably in tower upper strata charging tray cloth wet feed feeding quantity be 1.5～2.5 tons/time, feeding temperature from waste gas inlet pipe (7) simultaneously is that 820 ℃～830 ℃ flows are 3900～6500M ³The flue gas of/h, make the boron mud surface that adds charging tray be dried to a hard formation rapidly, and there are a lot of boron mud dry powders to come off on the charging tray surface, the boron mud of the follow-up adding charging tray that no longer bonds, under handler (4) promoted, material was successively moved down along Archimedes spiral by the upper strata, and balancedly carry out exchange heat, material moisture is constantly evaporated, and the rising that purifies air by feeding naturally, discharge from humidity discharging pipe (6) at last.Until bottoms material bone dry, discharge by products export (12).Dried boron mud is pulverized through chain type pulverizer or Universalpulverizer, produced moisture and granularity and all can satisfy and manufacture the boron mud fine powder that agglomerates of sintered pellets is used.

Claims

1, a kind of equipment for preparing dry boron mud, constitute laminar pneumatic conveying drying tower by center transmission main shaft (1), flue charging tray (2), insulated case (3) handler (4), the inlet (5) that purifies air, humidity discharging pipe (6), waste gas inlet pipe (7), flue gas outlet pipe (8), reductor (9), gearbox (10), wet feed inlet (11) and products export (12), feature is that waste gas inlet pipe (7) is contained in insulated case (3) top, and flue gas outlet pipe (8) is contained in the bottom of tower body; Go up most the thickness of the thickness of three layers of flue charging tray (2) greater than each flue charging tray (2) below three layers.

2, according to the equipment of the dry boron mud of the described preparation of claim 1, it is characterized in that the material that goes up three layers of flue charging tray (2) most selects boiler plate for use, its thickness is preferably 12mm.

3, adopt the described equipment of claim 1 to prepare the method for dry boron mud, may further comprise the steps:

A) boron mud wet feed is added the upper strata flue charging tray (2) from tower top wet feed inlet (11),

B) when adding boron mud wet feed, send into high-temperature flue gas to the superiors' flue charging trays (2) from waste gas inlet pipe (7) and successively move down at last and discharge by flue gas outlet (8),

C) material moves down gradually along Archimedes spiral under heating state and under the promotion of handler (4), and dried boron mud product is discharged from products export (12),

D) moisture of boron mud dry run is taken away by the air rising that the inlet that purifies air under the tower enters, discharges from the humidity discharging pipe (6) of cat head at last,

It is characterized in that flue gas and boron mud wet feed begin equidirectionally to move down gradually from the superiors' flue charging tray, the flue gas inlet temperature is controlled to be 820 ℃～830 ℃, flue-gas flow rate is controlled to be 3900～6500M3/h, and the wet feed feeding quantity is 1.5～2.5T/h, and purifying air is that nature enters and discharges.

4, according to the method for the dry boron mud of the described preparation of claim 3, the humidity of boron mud wet feed that it is characterized in that charging is less than 30%.

5,, it is characterized in that the moisture content of dry boron mud product is 8%～10% according to the method for the dry boron mud of the described preparation of claim 3.