CN103103342A - Rectangular vertical vacuum furnace for treating arsenic-containing gold mine - Google Patents
Rectangular vertical vacuum furnace for treating arsenic-containing gold mine Download PDFInfo
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- CN103103342A CN103103342A CN2013100610436A CN201310061043A CN103103342A CN 103103342 A CN103103342 A CN 103103342A CN 2013100610436 A CN2013100610436 A CN 2013100610436A CN 201310061043 A CN201310061043 A CN 201310061043A CN 103103342 A CN103103342 A CN 103103342A
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Abstract
A rectangular vertical vacuum furnace for treating arsenic-containing gold mine. One end of a spiral conveyer is provided with a high calcining material level automatic control device and a low calcining material level automatic control device. A feeding area is provided with a spiral feeding extension machine; a feeding outlet of the spiral feeding extension machine is provided with a feeding amount control mechanism and a splitter; a blanking channel below the splitter comprises a plurality of guide units; and a guide unit comprises guide tilted plate bracket strips and guide tilted plates installed on the guide tilted plate bracket strips, which are fixed on a furnace wall. The guide tilted plates comprise a first guide tilted plate, a second guide tilted plate, a third guide tilted plate and a fourth guide tilted plate; the first guide tilted plate and the second guide tilted plate are connected into a guide rack in an inverted ''V'' shape; the third guide tilted plate and the fourth guide tilted plate are in the shape of an inverted Chinese character ''eight'' and arranged under the guide rack in inverted ''V'' shape; and a second tilted plate guide area is in connection with an arsenic vapor insulation rising transport channel. The furnace provided by the invention can accelerate the volatilization of arsenic, and improve effect of calcining arsenic removal.
Description
Technical field
The present invention relates to non-ferrous metal pyrometallurgy technical field, specifically a kind of rectangle vertical vacuum furnace that arsenic-containing gold ore is carried out Vacuum Heat decomposition dearsenification.
Background technology
Chinese patent 201210338370.7 discloses a kind of vacuum rotary kiln of the desulfurization that is applicable to dewater, comprise the feed device system, the rotary kiln apparatus system, the discharge device system, heating plant system and dust treatment retrieving arrangement system, the rotary kiln apparatus system comprises kiln head cover, kiln hood and rotary kiln shell, rotary kiln shell supports by support roller, rotary kiln transmitting gear and kiln body dynamic sealing device are installed on rotary kiln shell, heating duct is installed in rotary kiln shell, spiral charging guide plate and T-shape material delivering plate, between every two spiral charging guide plates, a T-shape material delivering plate is installed, heating duct comprises kiln hood center blast main, kiln tail center blast main and branch wind pipe, branch wind pipe is distributed between kiln hood center blast main and kiln tail center blast main ringwise, the branch wind pipe that is positioned at the center and kiln hood center blast main and kiln tail center blast main are communicated with, and other branch wind pipe two ends and kiln hood center blast main and kiln tail center blast main collect, be positioned to divide equally on the outer wall of branch wind pipe at center and be welded with 4～8 fins, kiln hood center blast main is connected with kiln tail center blast main to be connected with the heating plant system for vane, on the blast main of kiln hood center, the blast main transmitting gear is installed, kiln head cover is provided with inlet mouth, viewing window and heating duct dynamic sealing device, and kiln head cover and kiln hood are equipped with service gate, is provided with in the kiln hood and scrapes bucket.When this vacuum rotary kiln was used for dearsenification, there was the hidden danger that comes off in the preservative coat on heating duct surface, and in a single day preservative coat comes off, and heating duct may be by the arsenic gas corrosion failure under hot conditions, thereby affects quality product; Also be difficult for detecting and keeping in repair the heating duct of perforation.Therefore, the vacuum dearsenification is fit to adopt electrothermal method, but, electrothermal tube is arranged in vacuum rotary kiln, due to the rotation of kiln body, electrothermal tube directly contacts with material, and the temperature on electrothermal tube surface is higher than envrionment temperature, the material inhomogeneous local superheating that causes of being heated in the kiln body can not meet processing requirement.
Chinese patent 200820113445.0 disclose a kind of from sulfurous iron ore and arsenical pyrite concurrent the device of separate sulfur arsenic iron, identical by two structures, the interconnective rectangle shaft furnace in up and down and off-set facility thereof consist of, the furnace roof of shaft furnace is provided with sealing continuously feeding bucket and self-conveyor feed, the inferior surface of machine case of charging machine has the discharge port of notched elongated strip shaped, be provided with the blanking channel that the guide swash plate forms in stove, the space of the both sides of blanking channel and guide swash plate is equipped with quartz electrothermal tube, set up temperature controlling point in stove, furnace roof is provided with the mine dust settling pocket, furnace bottom is provided with leads slag cone and helical slag removing machine.There is the sealed tube at electrothermal tube two ends the both sides, furnace wall that quartz electrothermal tube is installed, and sealed tube is welded on the water-cooling jacket of furnace wall, stove length direction both sides.When this device was used for dearsenification, the volatilization of arsenic steam was thorough not.
Summary of the invention
The objective of the invention is the deficiency for the prior art existence, a kind of rectangle vertical vacuum furnace of processing arsenic-containing gold ore is provided, accelerate the volatilization of arsenic, improve the effect of roasting for arsenic removal.
the present invention realizes that the technical scheme that above-mentioned purpose is taked is: a kind of rectangle vertical vacuum furnace of processing arsenic-containing gold ore, comprise dehydration desulfurization calcining storage tank, self-conveyor feed, the vacuum oven main body, arsenic steam insulation rising transfer passage and helical slag removing machine, self-conveyor feed is arranged on the top of vacuum oven main body, self-conveyor feed is connected with dehydration desulfurization calcining storage tank, the vacuum oven main body comprises charging zone, swash plate guide district and material area of slack water, swash plate guide district is provided with blanking channel, the gap of blanking channel and material area of slack water are equipped with electrothermal tube, the electrothermal tube two ends seal by sealed tube, arsenic steam insulation rising transfer passage is connected with the vacuum oven main body, helical slag removing machine is communicated with the bottom of vacuum oven main body, and the discharge port of helical slag removing machine is connected with sealing deslagging self-con-tained unit, the end that worm conveyor is connected with the vacuum oven main body is provided with high-order calcining material level self-con-tained unit and low level calcining material level self-con-tained unit, swash plate guide district comprises the first swash plate guide district, the second swash plate guide district and the 3rd swash plate guide district, are connected with the material area of slack water and connect in charging zone, the first swash plate guide district, the second swash plate guide district, the 3rd swash plate guide district, charging zone is connected with the first swash plate guide district by dividing plate, charging zone is provided with the screw feeding extension set in the bottom of worm conveyor, the installation direction of screw feeding extension set and self-conveyor feed horizontal vertical, and consistent with the installation direction of electrothermal tube, the discharge port of screw feeding extension set is provided with feeding quantity controlling organization and reduction device, blanking channel is located at below reduction device, blanking channel is comprised of several guides unit, the guide unit comprises guide swash plate and guide swash plate holder bar, the guide swash plate is arranged on guide swash plate holder bar, and guide swash plate holder bar is fixed on the furnace wall of vacuum oven main body, the guide swash plate comprises the first guide swash plate, the second guide swash plate, the 3rd guide swash plate and the 4th guide swash plate, the first guide swash plate be connected the guide swash plate and connect, and form the guide frame that falls " V " shape, the 3rd guide swash plate and the 4th guide swash plate are down the guide frame below that " eight " shape is located at down " V " shape, make material fall into respectively the 3rd guide swash plate and the 4th guide swash plate from the first guide swash plate and the second guide swash plate, the second swash plate guide district is connected with arsenic steam insulation rising transfer passage.
The electrothermal tube of described material area of slack water is provided with the electrothermal tube protective guard outward, and the material area of slack water is provided with material level viewing window and lower material level viewing window.
Described vacuum oven main body also comprises cooling tank, and cooling tank top is connected with the material area of slack water, and the bottom is connected with helical slag removing machine, adopts air-cooled pipe network to carry out material in cooling tank cooling.
The sealing of described electrothermal tube and sealed tube is completed by tightness system, and tightness system comprises O type rubber seal in nut gland, pressure pipe, microsprings, pressure ring, electrothermal tube, the outer O type rubber seal of electrothermal tube, plug, porcelain ring, porcelain tube, glass fibre and resistance wire; Nut gland and sealed tube are threaded connection, and the nut gland is pushed down pressure pipe and microsprings, and pressure pipe is with the outer O type rubber seal jacking inward of electrothermal tube, to sealing between sealed tube internal surface and electrothermal tube outside surface; The nut gland is pushed down microsprings, and microsprings is contacted with pressure ring, and pressure ring contacts with O type rubber seal in electrothermal tube, makes the internal surface contact seal of plug and electrothermal tube; The plug center is provided with the aperture less than the resistance wire diameter, and resistance wire passes also protruding from the aperture extruding of plug, plug and porcelain loop contacts, and the porcelain ring contacts with porcelain tube, and porcelain tube contacts with the spiral starting point circle of resistance wire.
The rectangle vertical vacuum furnace of described processing arsenic-containing gold ore is provided with air-cooled chuck outside the furnace wall, dehydration desulfurization calcining storage tank is connected with the desulfurization vacuum rotary kiln system of dewatering; Arsenic steam insulation rising transfer passage is connected with product condensing cooling system.
Described helical slag removing machine is chuck air-cooled spiral residue extraction machine.
The present invention compared with prior art, the beneficial effect that can obtain is as follows:
(1) be provided with the screw feeding extension set at charging zone, the discharge port of screw feeding extension set is provided with feeding quantity controlling organization and reduction device, and the feeding quantity controlling organization can pass through to change the opening width of discharge port, thereby controls discharging speed.Reduction device evenly is divided into two curve circuits with material and imports swash plate guide district, and the mounting structure of improvement guide swash plate, increased the length of blanking route, extended the desulfurization calcining and rolled the time of landing, thereby made the material in the landing process, arsenical pyrite can decomposes, disengage element arsenic, the FeS that decomposites still stays in residue, can complete the dearsenification task in 15 minutes, significantly improves the effect of calcining dearsenification.
(2) swash plate guide district is provided with respectively the first swash plate guide district, the second swash plate guide district and the 3rd swash plate guide district, the second swash plate guide district is connected with arsenic steam insulation rising transfer passage, when the arsenic steam that evaporates is pooled to herein, all passed through the filtration of calcining rain, the arsenic steam that enters funnel uptake is cleaner, as long as guarantee that the temperature of arsenic steam insulation rising transfer passage maintains 600 ℃, the arsenic steam can be delivered to product condensing cooling system and carry out condensation and collect.
(3) bottom, swash plate guide district connection material area of slack water, distillation later stage solid accumulation are at this slow decreasing, and the arsenic in material is evaporated completely substantially at this moment, at this sluggish flow, time expand, can make the arsenic volatilization more thorough.The material area of slack water adopts the electrothermal tube protective guard of heat conduction that electrothermal tube and material are separated; the cover closedtop lid of electrothermal tube protective guard; adopt baffle maze to block material at the bottom of the cover of electrothermal tube protective guard and enter the electrothermal tube protective guard; and still be in vacuum state in the electrothermal tube protective guard, can not accumulate material yet.
(4) described rectangle vertical vacuum furnace is connected with dehydration desulfurization vacuum rotary kiln system, and making what add the rectangle vertical vacuum furnace is all dried ore deposit rather than wet ore deposit, and reinforced operation is simpler.Whole process is all that when doing the ore deposit, the angle of inclination of guide swash plate is unified, and the material speed toward dirty automatically is consistent, and the bed thickness on the guide swash plate is attenuate gradually along with the volatilization of arsenic, accelerates the volatilization of arsenic.
(5) improved the sealing means of electrothermal tube, if electrothermal tube cracking, vacuum in vacuum oven can hold first of O type rubber seal immediately, and and then microsprings can inwardly advance second O type rubber seal, makes the vacuum state in vacuum oven can be not destroyed.
Description of drawings
To be rectangle vertical vacuum furnace of the present invention always scheme with the syndeton of dehydration desulfurization vacuum rotary kiln system Fig. 1.
Fig. 2 is the structural representation of rectangle vertical vacuum furnace of the present invention.
Fig. 3 is the side-view of rectangle vertical vacuum furnace shown in Figure 2.
Fig. 4 is the screw feeding extension set of rectangle vertical vacuum furnace of the present invention and the scheme of installation of guide swash plate.
Fig. 5 is the structural representation of a guide unit.
Fig. 6 is the sealed structural representation of electrothermal tube and sealed tube.
Embodiment
Below by the drawings and specific embodiments, technical scheme of the present invention is described further.
a kind of rectangle vertical vacuum furnace of processing arsenic-containing gold ore, comprise dehydration desulfurization calcining storage tank A2, self-conveyor feed A3, the vacuum oven main body, arsenic steam insulation rising transfer passage A20 and chuck air-cooled spiral residue extraction machine A17, self-conveyor feed A3 is arranged on the top of vacuum oven main body, self-conveyor feed A3 is connected with dehydration desulfurization calcining storage tank A2, the vacuum oven main body comprises charging zone, swash plate guide district, material area of slack water A23 and cooling tank A22, swash plate guide district is provided with blanking channel, the gap of blanking channel and material area of slack water A23 are equipped with electrothermal tube A11, electrothermal tube A11 two ends seal by sealed tube, arsenic steam insulation rising transfer passage A20 is connected with the vacuum oven main body, chuck air-cooled spiral residue extraction machine A17 is connected with the bottom of vacuum oven main body, and the discharge port of chuck air-cooled spiral residue extraction machine A17 is connected with sealing deslagging self-con-tained unit A18, the end that worm conveyor A3 is connected with the vacuum oven main body is provided with high-order calcining material level self-con-tained unit A4 and low level calcining material level self-con-tained unit A5, swash plate guide district comprises the first swash plate guide district A26, the second swash plate guide district A25 and the 3rd swash plate guide district A24, charging zone, the first swash plate guide district A26, the second swash plate guide district A25, the 3rd swash plate guide district A24 are connected with material area of slack water A23 and are connected, and charging zone is connected with the first swash plate guide district A26 by dividing plate A6-0, charging zone is provided with screw feeding extension set A6 in the bottom of worm conveyor A3, the installation direction of screw feeding extension set A6 and self-conveyor feed A3 horizontal vertical, and consistent with the installation direction of electrothermal tube A11, the discharge port of screw feeding extension set A6 is provided with feeding quantity controlling organization A7 and reduction device A8, blanking channel is located at reduction device A8 below, blanking channel is formed by connecting by several guides unit, the guide unit comprises guide swash plate A10 and guide swash plate holder bar A9, guide swash plate A10 is arranged on guide swash plate holder bar A9, guide swash plate holder bar A9 is fixed on the furnace wall A12 of vacuum oven main body, and furnace wall A12 is provided with air-cooled chuck A13 outward, guide swash plate A10 comprises the first guide swash plate A10-1, the second guide swash plate A10-2, the 3rd guide swash plate A10-3 and the 4th guide swash plate A10-4, the first guide swash plate A10-1 be connected guide swash plate A10-2 and connect, and form the guide frame that falls " V " shape, the 3rd guide swash plate A10-3 and the 4th guide swash plate A10-4 are located at down the guide frame below of " V " shape, and form the guide frame of " eight " shape, and make material fall into respectively the 3rd guide swash plate A10-3 and the 4th guide swash plate A10-4 from the first guide swash plate A10-1 and the second guide swash plate A10-2, the second swash plate guide district A25 is connected with arsenic steam insulation rising transfer passage A20.
The electrothermal tube A11 of material area of slack water A23 is provided with electrothermal tube protective guard A14 outward, and material area of slack water A23 is provided with material level viewing window A15 and lower material level viewing window A16.
Cooling tank A22 top is connected with material area of slack water A23, and the bottom is connected with chuck air-cooled spiral residue extraction machine A17, and it is cooling that in cooling tank A22, the air-cooled pipe network A19 of employing carries out material.
The present invention is connected with the dehydration desulfurization vacuum rotary kiln A1 of system by dehydration desulfurization calcining storage tank A2; A20 is connected with the product condensing cooling A21 of system by arsenic steam insulation rising transfer passage.
The sealing of described electrothermal tube A11 and sealed tube B2 is completed by tightness system, and tightness system comprises O type rubber seal B6 in gland B1, pressure pipe B3, microsprings B4, pressure ring B5, electrothermal tube, electrothermal tube outer O type rubber seal B7, plug B8, porcelain ring B9, porcelain tube B10, glass fibre B11 and resistance wire B12.Nut gland B1 and sealed tube B2 are threaded connection, nut gland B1 pushes down pressure pipe B3 and microsprings B4, pressure pipe B3 is with the outer O shape rubber seal B7 jacking inward of two electric heating tube walls, to sealing reliably between sealed tube B2 internal surface and electrothermal tube A11 outside surface.Nut gland B1 pushes down microsprings B4, and microsprings B4 is slightly contacted with pressure ring B5, and pressure ring B5 contacts with O type rubber seal B6 in two electrothermal tubes, makes the internal surface contact seal of plug B8 and electrothermal tube A11.Plug B8 center has one less than the aperture of resistance wire B12 diameter, resistance wire B12 passes also protruding from the central small hole extruding of plug B8, resistance wire B12 and plug B8 are tight seals, plug B8 contacts with porcelain ring B9 simultaneously, porcelain ring B9 contacts with porcelain tube B10, and porcelain tube B10 contacts with the spiral starting point circle of resistance wire B12.Because the cold junction of resistance wire B12 is longer, because plug B8 is in outside air-cooled chuck, so plug B8 can not burnt, the centre hole of plug B8 can not become flexible yet yet.If the electrothermal tube cracking, because the vacuum in stove can hold first of O type rubber seal B6 immediately, and then microsprings B4 can inwardly advance second O type rubber seal B6, so the vacuum state in stove can be not destroyed.
Principle of work of the present invention is as follows:
At first this technique dewater in the dehydration desulfurization vacuum rotary kiln A1 of system after desulfurization, calcining is stored in dehydration desulfurization calcining storage tank A2, deliver to top one side of vacuum oven main body by worm conveyor A3, worm conveyor A3 is divided into two portions, and the stove outer part has been drawn together the cylindrical shell of worm conveyor A3, only has screw blade that calcining is pushed forward in stove, until high-order calcining material level self-con-tained unit A4 place, material is during higher than the A4 position, and screw machine A3 stops feeding, can avoid filling feed bin too full.Below worm conveyor A3, three screw feeding extension set A6 that intersect vertically with worm conveyor A3 are arranged, screw feeding extension set A6 only has screw blade, when material is pushed to low level calcining material level self-con-tained unit A5 place, three screw feeding extension set A6 stalls simultaneously, this moment, whole charging scffold had material.Be provided with respectively feeding quantity controlling organization A7 below three screw feeding extension set A6, stablize three screw feeding extension set A6 by manual shift port opening degree and have identical feeding quantity.For A10 minute two lines of the guide swash plate that material is assigned to equably both sides toward dirty, so below three outlets design and installation reduction device A8.Reduction device A8 divides equally material on the guide swash plate A10 that falls into both sides, and the two ends of guide swash plate A10 are shelved on guide swash plate holder bar A9, and holder bar A9 is fixed on the A12 of furnace wall.For guaranteeing that furnace wall A12 can not react with the arsenic steam; the furnace wall A12 that all arsenic steams pass through and duct wall have all adopted air-cooled chuck A13 to carry out air-cooled; even the corrosion protective covering of furnace wall A12 comes off, the arsenic steam also just condenses on furnace wall A12 or tube wall, can not react.
Application Example
It is 2.02 meters * 2.82 meters that the inventor has designed a cross section, the rectangle vertical vacuum furnace that total height is 7.3 meters, and the segmentation manufacturing, segmentation is installed.Adopt the 8# unequal-angle bar to strengthen between air-cooled chuck.1.2 meters of every section height, the stiffening web of every section upper lower rim, the long limit of 8# angle steel is outside, and minor face is adherent, and long limit is as flange, and up and down two joint seal weldings during detachable maintaining, cut open weld seam, because long limit is longer, when maintenance is well installed again, but welded seal again.
The inwall of this equipment high-temperature zone adopts RLHY-12/800 coating heat-insulation and heat-preservation, high temperature resistantly reaches 1100 ℃, can long term operation in the hot environment of 1000 ℃, also have the performances such as waterproof, anticorrosion, wear-resisting, insulation.Inwall brushing thickness 15mm can guarantee outside wall temperature less than 50 ℃, and passes into cold wind between air-cooled chuck, even the coating local shedding is also guaranteed furnace wall temperature less than 400 ℃, the arsenic steam can pyroreaction not occur and furnace shell is corroded with the metal furnace wall.Air-cooled chuck not only plays the effect of cooling protection furnace shell, has also strengthened the intensity of furnace shell, can guarantee that the pressure of vacuum is satisfied in the furnace wall indeformable.Body of heater, flue and joint flange adopt the processing of Q235-A steel, and the sealing-ring of flange adopts the fluororubber O-type sealing-ring sealing of 250 ℃ of heatproofs, also has air-cooled measure higher than the positions of 250 ℃.
Be equipped with the guide swash plate of 40 degree in stove, the two ends of guide swash plate are shelved on same inclination 40 degree of guide swash plate and have on the guide swash plate holder bar of vertical hook, can prevent that the guide swash plate is out of shape because expanding with heat and contract with cold.The guide swash plate of hot-zone and with the guide swash plate holder bar of hook in stove; the employing heat-resisting steel sheet and plate is made; the two sides all applies RLHY-2339 type thermostable heat-conductive coating; spary is on the surface; form the coating of 0.5mm, high temperature resistantly reach 1800 ℃, coating structure is fine and close; the protection matrix has wear-resisting, corrosion resistance nature.
In the heating length range of resistance wire spiral coil, the RLHY-2339 type thermostable heat-conductive coating of spraying 0.3mm thickness can make resistance wire strengthen heat-transfer rate 20%, reduces the temperature gradient of resistance wire and envrionment temperature.So the work-ing life of body of heater and heating unit and quartz protecting tube can be very long.
The sealing means of electrothermal tube is as follows:
Adopting external diameter is ∮ 38mm; the electrothermal tube of wall thickness 2mm is done the protective tube of resistance wire; select external diameter ∮ 50mm, the weldless steel tube of wall thickness 3.5mm is welded on the sealed tube of doing electrothermal tube between the chuck of furnace wall, and this moment, the internal diameter of sealed tube was (∮ 50mm-3.5mm * 2)=∮ 43mm.Gap between sealed tube inwall and electrothermal tube outer wall is (43mm-38mm) ÷ 2=2.5mm, selects the silicon rubber O-ring seals of 2 same 3mm diameter of sections, seals reliably between the outer wall to the inwall of sealed tube and electrothermal tube.
The interior sectional dimension of rectangle vertical heater is 2020mm * 2820mm, the efficient heat generation length of choosing electrothermal tube is 2300mm, the two ends of resistance wire heating part also have 260mm near the distance of furnace wall respectively, enter within sealed tube is in again air-cooled chuck, can guarantee it is cold junction so be in the resistance wire of this section in sealed tube.
According to the arrangement principle of electrothermal tube, selected resistance wire diameter d=2mm.
When adopting the 380V power voltage supply, the power that calculates every electrothermal tube is 12469.8w, approximate 12kw, heating section spiral resistance wire total surface area 20153cm2, checking computations resistance wire surface load: 12469.8w ÷ 20153cm2=0.618w/cm2, less than 800 ℃～1000 ℃ of metal electric hot bodys allow surface load 1～1.5w/cm2, so the surface load of the design's resistance wire belongs to safe handling.
If when adopting the 220V power voltage supply, the power 7220.4w of every resistance wire approximates 7.2kw, checks the resistance wire surface load this moment: 7220.4w ÷ 20153cm2=0.358w/cm2, more less than 1～1.5w/cm2, so the surface load of the design's resistance wire belongs to the safe handling scope fully.
The hot-zone volume that this burner hearth has been installed nichrome wire is 26.88m3,253 of electrothermal tubes are installed, when adopting the 380V power voltage supply, the power 12kw of every electrothermal tube, article 253, the total power 3036kw of electrothermal tube, the hot-zone volumetric loading is: 3036kw ÷ 26.88m3=112.95kw/m3.Domestic certain vacuum resistance furnace, heating member are Cr20Ni80,900 ℃ of working temperatures, operating voltage is 0～105V, hot-zone volume 0.0212m3, hot-zone volume heat load 707kw/m3, than the hot-zone volume heat load of this stove large 6.26 times, but this stove hot-zone volume is smaller.Certain external vacuum molybdenum wire furnace, 1100 ℃ of working temperatures, hot-zone volume 4.92m3, hot-zone volume heat load 160kw/m3 is 1.42 times of this vacuum oven 112.95kw/m3.
If adopt the 220V power voltage supply, the power of every electrothermal tube is 7.2kw, and the total power 1821.6kw of 253 electrothermal tubes, hot-zone volumetric loading are 1821.6kw ÷ 26.88m3=67.77kw/m3.Domestic certain vacuum resistance furnace, heating member are Cr20Ni80,900 ℃ of working temperatures, and hot-zone volume 19m3, hot-zone volume heat load 63.2kw/m3, approaching with the situation of this stove hot-zone volumetric loading 67.77kw/m3.
From known example case analysis, no matter the dearsenification vacuum oven of this example is the 380V power supply, or the 220V power supply can be adopted.
Reach 99% in 750 ℃ of vacuum distilling dearsenifications calcining of 15 minutes rate of getting away, carry gold if directly eject, must be cooled to normal temperature, what the air-cooled pipe network of warm sludge ejected is hot blast, needs Returning utilization.So designed independently air cooling system between the chuck of helical slag removing machine and in sealing deslagging bucket, the residue of guaranteeing to eject is near normal temperature.
The dearsenification calcining of arsenic-containing gold ore has two kinds for the treatment of processs:
1, the gold mine of a sulfur-bearing arsenic can directly reclaim later on gold in dearsenification.
2, the gold mine of sulfur-bearing, arsenic, carbon must continue to carry out the normal pressure roasting at vacuum rotary kiln after dearsenification.Vacuum rotary kiln can adopt oxygen-enriched air roasting, burns the S in C and FeS under the normal pressure of comparatively high temps, and carbon burning becomes CO
2, obtain Fe after the FeS roasting
2O
3And SO
2, SO wherein
2Be used for sulfuric acid processed, calcining is carried gold, and the hot blast that roasting produces extracts with heat transfer tube, is used for oven dry and carries golden slag, and carrying golden slag is mainly Fe
2O
3, be used for ironmaking after drying and dewatering.
Claims (6)
1. rectangle vertical vacuum furnace of processing arsenic-containing gold ore, comprise dehydration desulfurization calcining storage tank, self-conveyor feed, vacuum oven main body, arsenic steam insulation rising transfer passage and helical slag removing machine, self-conveyor feed is arranged on the top of vacuum oven main body, self-conveyor feed is connected with dehydration desulfurization calcining storage tank, the vacuum oven main body comprises charging zone, swash plate guide district and material area of slack water, swash plate guide district is provided with blanking channel, the gap of blanking channel and material area of slack water are equipped with electrothermal tube, and electrothermal tube two ends seal by sealed tube; Arsenic steam insulation rising transfer passage is connected with the vacuum oven main body; Helical slag removing machine is communicated with the bottom of vacuum oven main body, and the discharge port of helical slag removing machine is connected with sealing deslagging self-con-tained unit; It is characterized in that, the end that worm conveyor is connected with the vacuum oven main body is provided with high-order calcining material level self-con-tained unit and low level calcining material level self-con-tained unit, swash plate guide district comprises the first swash plate guide district, the second swash plate guide district and the 3rd swash plate guide district, are connected with the material area of slack water and connect in charging zone, the first swash plate guide district, the second swash plate guide district, the 3rd swash plate guide district, charging zone is connected with the first swash plate guide district by dividing plate; Charging zone is provided with the screw feeding extension set in the bottom of worm conveyor, the installation direction of screw feeding extension set and self-conveyor feed horizontal vertical, and consistent with the installation direction of electrothermal tube; The discharge port of screw feeding extension set is provided with feeding quantity controlling organization and reduction device, blanking channel is located at below reduction device, blanking channel is comprised of several guides unit, the guide unit comprises guide swash plate and guide swash plate holder bar, the guide swash plate is arranged on guide swash plate holder bar, and guide swash plate holder bar is fixed on the furnace wall of vacuum oven main body; The guide swash plate comprises the first guide swash plate, the second guide swash plate, the 3rd guide swash plate and the 4th guide swash plate, the first guide swash plate be connected the guide swash plate and connect, and form the guide frame that falls " V " shape; The 3rd guide swash plate and the 4th guide swash plate are down the guide frame below that " eight " shape is located at down " V " shape, make material fall into respectively the 3rd guide swash plate and the 4th guide swash plate from the first guide swash plate and the second guide swash plate; The second swash plate guide district is connected with arsenic steam insulation rising transfer passage.
2. the rectangle vertical vacuum furnace of processing arsenic-containing gold ore according to claim 1, is characterized in that, the electrothermal tube of described material area of slack water is provided with the electrothermal tube protective guard outward, and the material area of slack water is provided with material level viewing window and lower material level viewing window.
3. the rectangle vertical vacuum furnace of processing arsenic-containing gold ore according to claim 1 and 2, it is characterized in that, described vacuum oven main body also comprises cooling tank, and cooling tank top is connected with the material area of slack water, the bottom is connected with helical slag removing machine, and it is cooling that in cooling tank, the air-cooled pipe network of employing carries out material.
4. the rectangle vertical vacuum furnace of processing arsenic-containing gold ore according to claim 3, it is characterized in that, the sealing of described electrothermal tube and sealed tube is completed by tightness system, and tightness system comprises O type rubber seal in nut gland, pressure pipe, microsprings, pressure ring, electrothermal tube, the outer O type rubber seal of electrothermal tube, plug, porcelain ring, porcelain tube, glass fibre and resistance wire; Nut gland and sealed tube are threaded connection, and the nut gland is pushed down pressure pipe and microsprings, and pressure pipe is with the outer O type rubber seal jacking inward of electrothermal tube, to sealing between sealed tube internal surface and electrothermal tube outside surface; The nut gland is pushed down microsprings, and microsprings is contacted with pressure ring, and pressure ring contacts with O type rubber seal in electrothermal tube, makes the internal surface contact seal of plug and electrothermal tube; The plug center is provided with the aperture less than the resistance wire diameter, and resistance wire passes also protruding from the aperture extruding of plug, plug and porcelain loop contacts, and the porcelain ring contacts with porcelain tube, and porcelain tube contacts with the spiral starting point circle of resistance wire.
5. the rectangle vertical vacuum furnace of processing arsenic-containing gold ore according to claim 4, is characterized in that, is provided with air-cooled chuck outside the furnace wall, and dehydration desulfurization calcining storage tank is connected with the desulfurization vacuum rotary kiln system of dewatering; Arsenic steam insulation rising transfer passage is connected with product condensing cooling system.
6. the rectangle vertical vacuum furnace of processing arsenic-containing gold ore according to claim 5, is characterized in that, described helical slag removing machine is chuck air-cooled spiral residue extraction machine.
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