CN203429235U

CN203429235U - Airtight pot furnace for producing zinc oxide

Info

Publication number: CN203429235U
Application number: CN201320549903.6U
Authority: CN
Inventors: 王全生
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-09-05
Filing date: 2013-09-05
Publication date: 2014-02-12
Anticipated expiration: 2023-09-05

Abstract

The utility model provides an airtight pot furnace for producing zinc oxide and belongs to the technical field of metallurgical industry, particularly provides energy-saving environmental-protection equipment which extracts zinc oxide from waste fly ash of steelmaking or pig iron. The airtight pot furnace is composed of a vertical airtight furnace, a reaction furnace and a cooling and recovering device, wherein the reaction furnace and the cooling and recovering device are matched with the vertical type airtight furnace; compared with a rotary furnace, the airtight pot furnace provided by the utility model has the following advantages that, 1, the index of used fly ash is wide, wherein the fly ash used in the rotary furnace contains less than 20% of iron and more than 20% of zinc, but the fly ash in which iron content is not limited and the zinc content is 6% can be used in the airtight furnace; 2, 0.45 ton of bind coal or 0.35 ton of coke powder is needed for each ton of fly ash in the rotary furnace, but no fuel needs to be fed in the airtight furnace; 3, the operation cycle is long, wherein the operation cycle of the rotary furnace is 60 days, but the operation cycle of the airtight furnace is more than one year; 4, the cost of a refractory material in the furnace is low, wherein the high-temperature wearing-resistance refractory bricks used in the rotary furnace is 3000 yuan/ton, but the cost of common refractory bricks used in the airtight furnace is 650yuan/ton; and 5, the tailings can be recycled conveniently, wherein the tailings of the rotary furnace flow out in a liquid form and needs to be cooled continuously with water, the iron content in the tailings is low and the utility value is low; the tailings of the airtight furnace are discharged in a solid form, the tailings with iron content being more than 50% can be directly used by ironworks, and the tailings with iron content being lower than 50% are directly used by cement plants.

Description

A kind of airtight pan furnace of producing zinc oxide

Technical field

The utility model belongs to metallurgy industry technical field, particularly a kind of energy saving and environment friendly equipment that extracts zinc oxide from the discarded dedusting ash of steel-making or the pig iron.

Background technology

Iron-smelting blast furnace is produced through coal gas dust removal and is produced a large amount of dedusting ash.This dedusting ash (flyash), containing zinc oxide 5-20%, because zinc oxide produces circulation enrichment in iron-smelting blast furnace is produced, is produced and is had serious harm blast furnace, and many enterprises are using this part dedusting ash as offal treatment.

At present, iron and steel enterprise processes containing oxide powder and zinc dust collecting method mainly: major part is sold local brick field and worked as internal combustion, and seldom a part is recycled by rotary kiln containing more than 20% dedusting ash of zinc.But because rotary kiln requires temperature high (1300-1400 ℃), rotary kiln directly extracts in the production process of zinc oxide, and in stove, easily ring formation burns till obstruction, causes rotary kiln with short production cycle, can not produce for a long time.The more important thing is when rotary kiln is produced 0.4 ton of left and right of fuel that must add the above heat of 6000 kilocalorie per ton in raw material, highly energy-consuming and environment is caused to serious pollution.

Summary of the invention

The purpose of this utility model is the lower sealed furnace device of temperature in a kind of stove of design, thereby significantly improves the production efficiency of extracting zinc oxide from flyash, greatly reduces environmental pollution.

The technical solution of the utility model is: the utility model is by vertical enclosed stove and supporting Reaktionsofen with it, cooling back receiving apparatus forms, it is characterized in that: dedusting ash ball press is communicated to the top loading mouth of sealed furnace by lift, in sealed furnace, middle part is high-temperature zone, high-temperature zone is air intake district below, sealed furnace bottom is solid tailings discharge area, sealed furnace top one side is by pipeline communication Reaktionsofen top, Reaktionsofen bottom is communicated to retrieving arrangement and purifying plant successively by pipeline, by purifying plant, be communicated to finished pot, the bottom of retrieving arrangement and purifying plant arranges dust-precipitator.

The beneficial effects of the utility model: compare the utility model with rotary kiln and extract zinc oxide have the following advantages from dedusting ash, 1, use dedusting ash index wide.Rotary kiln uses dedusting ash iron content below 20%, contains zinc more than 20%; Sealed furnace is used dedusting ash iron content not limit, and contains zinc more than 6%.2, without adding fuel.Rotary kiln dedusting ash per ton need to be added 0.35 ton of 0.45 ton, hard coal or coke powder; Sealed furnace is without adding fuel.3, the cycle of operation is long.The rotary kiln cycle of operation is 60 days; The sealed furnace cycle of operation is greater than 1 year.4, in stove, refractory materials cost is low.3000 yuan/ton, high-temperature wearable refractory brick for rotary kiln; 650 yuan/ton, common refractory brick for sealed furnace.5, tailings recycling is convenient.Rotary kiln tailings is liquid outflow, needs water constantly cooling, and tailings iron content is low, and utility value is low; Sealed furnace tailings is solid-state drawing off, and the above ironworks of tailings iron-holder 50% can directly utilize, and 50% following cement mill directly utilizes.

Accompanying drawing explanation

Accompanying drawing 1 is rotary kiln one-piece construction schematic diagram.

Accompanying drawing 2 is the utility model one-piece construction schematic diagram.

Embodiment

At present iron-smelting blast furnace produce in iron content 20% below, contain more than 20% dedusting ash of zinc and can recycle by rotary kiln.The one-piece construction of rotary kiln as shown in Figure 1.Mixing device 3 is provided with dedusting ash entrance 1 and fuel inlet 2, and mixed raw material to rotary kiln opening for feed 5, enters high-temperature zone 7 through revolution body of heater 6 by lift 4, reclaims zinc oxide after material gasification, and liquid tailings enters pond cooling 8 simultaneously.Whole production process is open, seriously polluted.

The utility model as shown in Figure 2, by vertical enclosed stove 3 and with it supporting Reaktionsofen 4, cool back receiving apparatus and form.Due to without adding fuel, dedusting ash is in 3/1(dedusting ash/water) ratio add water, by ball press 1, make the particle of 0.3-1cm, by lift 2, be transported to the top loading mouth 3-1 of sealed furnace 3.

Particulate state furnace charge moves downward under the effect of self gravitation, burning by raw material self institute carbon containing provides heat, make temperature in stove reach 800-950 ℃, zinc element in raw material is reduced gasification at the interior middle part of sealed furnace 3 high-temperature zone 3-2, under the effect of induced draft fan, by one side pipe road, sealed furnace 3 top, enter Reaktionsofen 4 tops.

Containing zinc gas, in the process of 4 li of operations downwards of Reaktionsofen, be oxidized fully, autoreaction stove 4 bottoms enter retrieving arrangement 6 and purifying plant 7, through cooled gas flow temperature, be down to 60-70 ℃, and carry out gas solid separation, gas discharging, powdery or grain-like zinc-oxide are drained into finished pot 8 through star-shaped dust-discharging valve.

The high-temperature zone 3-2 of sealed furnace 3 is air intake district 3-3 below, is provided with air-blast device.Sealed furnace 3 bottoms are solid tailings discharge area 3-4.The bottom of retrieving arrangement 6 and purifying plant 7 arranges dust-precipitator 9, regularly sends the dust accumulating in process of cooling.Whole production process is air-tight state, and environment is not polluted.

Claims

1. an airtight pan furnace of producing zinc oxide, by vertical enclosed stove and supporting Reaktionsofen with it, cooling back receiving apparatus forms, it is characterized in that: dedusting ash ball press (1) is communicated to the top loading mouth (3-1) of sealed furnace (3) by lift (2), in sealed furnace (3), middle part is high-temperature zone (3-2), high-temperature zone (3-2) is air intake district (3-3) below, sealed furnace (3) bottom is solid tailings discharge area (3-4), sealed furnace (3) top one side is by pipeline communication Reaktionsofen (4) top, Reaktionsofen (4) bottom is communicated to retrieving arrangement (6) and purifying plant (7) successively by pipeline, by purifying plant (7), be communicated to finished pot (8), the bottom of retrieving arrangement (6) and purifying plant (7) arranges dust-precipitator (9).

2. a kind of airtight pan furnace of producing zinc oxide according to claim 1, is characterized in that: when sealed furnace (3) is highly 9 meters, when diameter is 3.2 meters, the interior high-temperature zone of sealed furnace (3) (3-2) is highly 0.8-1 meter.

3. a kind of airtight pan furnace of producing zinc oxide according to claim 1, is characterized in that: the interior refractory materials of sealed furnace (3) is used the coventional type refractory brick of≤1000 ℃.