CN102589280A

CN102589280A - Rotary kiln for calcining minerals

Info

Publication number: CN102589280A
Application number: CN2012100538547A
Authority: CN
Inventors: 唐铁石
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-03-05
Filing date: 2012-03-05
Publication date: 2012-07-18

Abstract

The invention aims at providing a rotary kiln for calcining minerals, which comprises a kiln tube and is characterized in that an inner kiln wall is composed of a convex area and a concave area which are made of fireproof materials. Height of linear fireproof tiles in the convex area is higher than that of the linear fireproof tiles in the concave area, and the concave area and the convex area are distributed like a Chinese character 'pin'. 1 when the minerals are arranged at the bottom of the kiln, the minerals are fully filled in a concave pit, when the kiln rotates, the minerals in the concave pit are brought to the upper portion from the bottom of a mineral layer along with the rotation of the kiln, the minerals slide out from the pit when rising to a certain angle and fall onto the upper surface of the mineral layer, the minerals on the lower layer are continuously brought to the upper surface, and the minerals in the inner layer can be turned to the surface layer; and accordingly the minerals can be evenly turned over and can be heated evenly. 2 granularity of the kiln minerals calcined in the rotary kiln is small, so that damage is small and service life of the fireproof tiles is long. 3 the granularity of the minerals is small, decomposing is fastened, calcining time is short, calcining speed in improved, yield is improved, and energy consumption is reduced.

Description

A kind of rotary kiln of calcined ore

Technical field

The present invention relates to a kind of rotary kiln of calcined ore, particularly relate to the rotary kiln of producing active lime.

Background technology

During with calcined by rotary kiln ore (for example lime stone), ore gets in the kiln, along with the rotation of kiln from an end (kiln tail) of kiln; The ore reach of constantly rolling; From the preheating zone to the high-temperature region again to the cooling zone, the ore concurrent biochemical reaction of being heated, finished product is discharged from the other end (kiln hood) of kiln.

The granularity of ore is one of deciding factor of product yield and quality.Granularity excessive being difficult for grills thoroughly, and ore is difficult for decomposing fully, tends to produce " giving birth to core ", and yields poorly, and energy consumption is high; Undersized, distance is little between ore and the ore, and heat energy is difficult to infiltration, and outer ore burns ripe, and the internal layer ore is also undecomposed or not decomposition fully; And the kiln inwall all is to be designed to smooth cambered surface, and the small grain size ore can not be translated into the upper strata like this, and the internal layer ore can not be translated into skin; Outer ore forms " cotton-wadded quilt effect ", and middle ore is difficult to be heated.Therefore the common ore grain size that adopts of rotary kiln is given it up less than the ore of 10mm between 10-40mm, causes the wasting of resources and entreprise cost to increase.Calcining small grain size ore if solved the problem of stirring, can also shorten the ore heated time, increases output, cuts down the consumption of energy, and is the problem that expectation at present solves.

Chinese patent CN201081536 discloses the lifting blade device of limekiln kiln tail, it is characterized in that this lifting blade section is the vertical gusset that the right angle " turns " type, has fixed via " turning " of lifting blade on the plate holding level with both hands.The lifting blade of this invention requires anti-impact force big, and in 1200 ℃ of temperature of high temperature, heat proof material requires wear-resistant; Not yielding; This just requires the performance of lifting blade high, increased the cost of rotary kiln, and lifting blade is fixed on directly on the cylindrical shell; Heat energy directly arrives cylindrical shell through lifting blade, has also increased the loss of energy.

Summary of the invention

The purpose of this invention is to provide a kind of small grain size of can calcining and (be generally that 0.5～8mm) ore, cost are low, the rotary kiln of less energy consumption.

Technical scheme of the present invention is: a kind of rotary kiln of lime burning, comprise the kiln tube, and it is characterized in that: the kiln inwall is made up of convex area and depressed area that refractory material constitutes.

The inner lining refractory block height of convex area is higher than the inner lining refractory block of depressed area.

Convex area and depressed area are isosceles triangle and arrange.

Inner lining refractory block is a high-alumina refractory brick, and the specification of the inner lining refractory block of depressed area is 60mm * 90mm * 150mm, and the inner lining refractory block specification of convex area is 60mm * 90mm * 220mm.

As a kind of variation, certainly only be provided with convex area and depressed area in the high-temperature region of rotary kiln.

Between kiln tube and inner lining refractory block, also comprise thermal insulation layer in the rotary kiln.

Beneficial effect of the present invention is: 1. when ore was in the bottom of kiln, ore had filled up the depression hole, when kiln rotates; Ore in the depression hole has been brought to top with the rotation of kiln from the ore layer bottom; When the certain angle, ore skids off in cheating, and falls above the ore layer last; Above lower floor's ore constantly was brought to, the internal layer ore also can be translated into the top layer; Ore can evenly move forward, and evenly stir, thereby ore can thermally equivalent.

2. the ore grain size of this calcined by rotary kiln is little, can not form big impulsive force to the refractory brick of the condition of high temperature, thereby destructive little, the refractory brick operating period is long.

3. ore grain size is little, and thermally equivalent has been accelerated decomposition rate, and calcination time is short, has improved calcinating speed, has increased output, has reduced energy consumption.

Description of drawings

Fig. 1 is the kiln body

Fig. 2 is the kiln inwall expanded view of rotary kiln.

Fig. 3 is the cutaway view of rotary kiln.

2 heat zones, 3 cooling zones, 1 preheating zone

4 convex areas, 5 depressed areas, 6 cylindrical shells

Specify below in conjunction with accompanying drawing:

When in kiln, laying bricks,, adopt that one group of brick is high, adjacent one group of low arrangement with regard to same circle, behind the first mounting boss of the promptly same circle district, the installed adjacent depressed area, mounting boss district again, installed adjacent depressed area once more, same circle convex area and depressed area are adjacent all the time; After installing first lap, second circle is just opposite with first lap, i.e. the first lap convex area installed adjacent second circle depressed area, second circle convex area, the so circulation of first lap depressed area installed adjacent; The 3rd circle is identical with the depressed area with the first lap convex area, and the 4th circle is identical with the depressed area with the second circle convex area; So cycle installation expires cylindrical shell.

The one group of brick in convex area and depressed area can be that a brick or several bricks are formed.The inwall that installs presents square one by one or rectangular " hole ".

Laying bricks in the kiln can be high alumina matter, clay matter, carborundum, magnesia, spinelle, composite refractory brick or other refractory materials.

The specific embodiment

The tailor-made high-alumina refractory brick that is used for 1.8 meters of diameters * 38 meters long inner liner of rotary kiln, a kind of specification is that 60mm (length) * 90mm (wide) * a kind of specification of 150mm (height) is 60mm (length) * 90mm (wide) * 220mm (height), each is half the.When laying bricks in the kiln, in each circle, be one group, finish building high one group and build low one group again that every circle is approximately 18 groups according to 3 bricks.

Finish building a circle and built for second when circle again, remain one group of 3 brick, different the is high brick of adjacent first lap be the low brick of second circle, the high group of second circle brick just in time keeps off toward the gap of the low group of first lap brick, the 3rd circle is built by laying bricks or stones according to the first lap order.

The present invention not only is confined to above embodiment, and anyone can obtain its similar products like under enlightenment of the present invention, in structure with do any change in form, makes identical or close technical scheme and all can fall into protection scope of the present invention.

Claims

1. the rotary kiln of a calcined ore comprises the kiln body, it is characterized in that: the kiln inwall of described kiln body is made up of convex area and depressed area that the different refractory material of height constitutes.

2. the rotary kiln of a lime burning comprises the kiln tube, it is characterized in that: the kiln inner face only is provided with the convex area and the depressed area that are made up of refractory material and forms in the high-temperature region.

3. according to claim 1 or claim 2 rotary kiln, it is characterized in that: described convex area and depressed area are isosceles triangle and arrange.

4. rotary kiln as claimed in claim 3 is characterized in that: described refractory material is an inner lining refractory block, and described convex area and depressed area are square or rectangle.

5. rotary kiln as claimed in claim 4; It is characterized in that: described inner lining refractory block is a high-alumina refractory brick; The specification of the inner lining refractory block of described depression convex area is 60mm * 90mm * 150mm, and the inner lining refractory block specification of described convex area is 60mm * 90mm * 220mm.

6. aforesaid rotary kiln is characterized in that: also comprise thermal insulation layer between described kiln tube and the described inner lining refractory block.