CN1182138A - Pretreatment method and its special equipment for extracting gold from refracting sulfide ore and carbide ore - Google Patents
Pretreatment method and its special equipment for extracting gold from refracting sulfide ore and carbide ore Download PDFInfo
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According to the physical and chemical property of ore, the present invention adopts direct roast in vertical kiln and/or open health type sublimation distilling furnace. The C, S, As and Sb contents in roasted sand are controlled below 0.1%, 0.05%, 0.5% and 100 ppm separately. The said vertical kilm is one cylinder, and the said open health type sublimation distilling furnace is a double decked structure including separated material space decker and health and flue decker with stirrer in material space. The present invention has less environment pollution and gold recovering rate of 90%.
Description
The invention relates to a pretreatment method of refractory gold ore, in particular to a pretreatment method of low-grade ore with ultrafine gold particles, arsenic, antimony and carbon-containing impurities of sulfide ore and carbonaceous ore and special equipment thereof.
At present, two schemes are mainly adopted for processing refractory ores at home and abroad. One solution is to improve the cyanidation conditions, such as enhanced cyanidation, pressure cyanidation, and oxygen cyanidation, but this direct cyanidation solution is only suitable for moderately refractory ores or concentrates, and the recovery of this direct cyanidation is not ideal. According to the best technical and economic indexes obtained by pressure cyanidation introduced by the university of south China Press for gold production and processing, the total dissolution rate of gold in antimony concentrate is 79.1%, and the dissolution rate of gold in arsenic concentrate is 71.3%. The other scheme is to carry out oxidation pretreatment on the ore, mainly comprising a two-section roasting technology, a special roasting technology, an ultra-fine grinding technology, a boiling roasting technology, a pressure oxidation technology, a chemical oxidation technology and the like, wherein most of the technologies have complex equipment or process, or have more medicament consumption and high cost, and simultaneously require high ore grade or concentrate. If the flotation process is adopted for enrichment treatment, for gold ores containing various impurities and low grade, the reaction to flotation reagents is slow due to the interference of various impurities, and the recovery rate is very low. The gravity separation process is ineffective for gold ores with fine gold particles and complex elements.
In many villages and towns in Anhua county of the inventor, a large amount of primary gold ores with low grade, arsenic, antimony, carbon and other impurities are stored, most of the primary gold ores cannot be extracted by a direct cyanidation method, or the recovery rate of direct cyanidation is very low, the economic benefit is very little, and the resource waste is serious. Through a large number of experimental researches, the inventor creates a set of method for pretreating gold ore with fine gold particles, low grade and containing impurities such as arsenic, antimony, carbon and the like. In other words, the task of the invention is to provide a pretreatment method for gold ore with coexisting multiple impurities or multiple interference elements, mainlycomprising arsenic, antimony, carbon and the like.
In the process of completing the problem, the adopted technical solution is as follows: according to the difference of physical and chemical properties of elements contained in the ore, a vertical kiln or/and a flat furnace sublimation distillation furnace are/is respectively adopted for direct roasting.
1. Mainly for the treatment of carbon-containing and sulfur-containing ores. The method comprises the following steps of crushing most of primary ores into 10-20 mm particles, crushing a small part of the primary ores into 1-5 mm particles, and loading the primary ores into a vertical kiln layer by layer, wherein the thickness of the ore with 10-20 mm particles on the first layer is 500-800 mm, the thickness of the ore with 1-5 mm particles on the second layer is 10-20 mm, and so on. After the ores are packed layer by layer, the ores are roasted in a vertical kiln. Controlling the temperature at 700-800 ℃, and roasting at high temperature for 24-36 hours. If the sulfur and carbon content in the ore is not enough, a small amount of pulverized coal can be added to support combustion, so that the oxidation degree of the ore reaches more than 98 percent. After the ore is oxidized into the loose porous calcine, the ore is discharged from the furnace and cooled, and the sample is tested, so that the carbon content in the calcine reaches below 0.1 percent, the carbon content is 0.03-0.05 percent better, and the sulfur content is below 0.05 percent, and the ore can be directly put into a tank for cyaniding. If the carbon content in the calcine is higher than 0.1% and the sulfur content is higher than 0.05%, the calcine can be put into a vertical kiln to be continuously roasted until the calcine reaches the standard.
2. And simultaneously, processing the carbon-containing and arsenic-containing refractory ore.The first step is to remove carbon and sulfur, and the method is as described above. The ore having been calcined in a first step in a shaft kiln to obtain As2S3By oxidation to As2O3The reaction formula is as follows: and secondly, removing arsenic, grinding the roasted sand after roasting in the vertical kiln to below 20 meshes, putting the ground sand into a flat furnace type sublimation distillation furnace for secondary roasting, controlling the temperature to be 200-210 ℃, and stirring while heating to ensure that As is2O3Sublimating to form a gas phase, and basically isolating the gas phase from air during roasting, namely: the furnace gas is pumped into a cooler to condense As from the gas phase2O3And collecting with cloth bag. In the calcine produced in the second calcination, As2O3The content is controlled below 0.5%, and the effect is better when the content is controlled to be 0.3-0.4%, so that the gold can be extracted in a cyaniding pool.
3. And simultaneously, the pretreatment of sulfide ores containing antimony, arsenic, carbon and the like. Firstly, removing antimony, crushing crude ore to below 20 meshes, filling the crushed crude ore into a flat furnace type sublimation distillation furnace, basically isolating the ore from air after the ore enters the furnace, controlling the temperature to be 1100-1200 ℃, and simultaneously violently stirring, wherein Sb is2S3Evaporating to vapor state, pumping furnace vapor into cooling system, and collecting Sb with cloth bag2S3Sb in calcine2S3The content of (B) must be controlled to be 100PPm or less. And step two, decarbonizing and desulfurizing, namely preparing the roasted product obtained in thestep one into balls with the diameter of 10-20 mm, and removing carbon and sulfur in a vertical kiln according to the decarbonizing and desulfurizing method. And thirdly, removing arsenic, namely crushing the roasted calcine obtained by roasting in the second step to below 20 meshes, and performing cyanidation on the calcine obtained by roasting for three times according to the arsenic removal method. The same method can be used for removing mercury and zinc, and only the temperature condition needs to be changed.
The vertical kiln adopts a cylindrical structure, such as a cylinder, the top surface is an opening for feeding, and a fire bar, a hearth and a discharge hole are designed below the vertical kiln.
Above-mentioned flat stove formula sublimation distillation stove, the furnace body is the tetragonal body, divide into two-layerly, the space of higher authority one deck for stacking the material, lower floor's design has flame path and furnace, be connected with the chimney on the flame path of lower floor, upper material space and U type pipe intercommunication, U type pipe meets with the sack, the design has a back and forth movement's material agitator in the material space, the material agitator makes the broach form, comb handle tail end design has an eccentric wheel, the eccentric wheel will drive whole agitator back and forth movement in the material space under the drive of power, design at the furnace body top has the feed inlet, the design has the discharge gate in the side of furnace body.
The invention is further illustrated below on the basis of various experimental investigations.
In the first experiment, 30 tons of raw ore containing carbon and arsenic is crushed to below 20 meshes and then is put into an open hearth furnace for one-time roasting, the temperature is controlled to be 1000-1200 ℃, the mixture is stirred while being heated, the roasted sand is taken out of the furnace and cooled, and then is put into a cyaniding tank for circulating cyanidation for 4 times, and 118 grams of gold is obtained. The same procedure can also be used for decoppering.
TABLE-comparison table of contents of elements after one-time roasting of 30 tons of raw ore
| Name (name) | Au(g/t) | C(％) | S(％) | As(％) | Fe2O3(％) |
| Raw ore | 6.2 | 0.4 | 2 | 1.3 | 5.23 |
| Roasted sand | 6.4 | 0.05 | 0.3 | 0.4 | 5.5 |
TABLE 30 tons of raw ore one-time roasting roasted sand gold recovery condition table
| Number of cyanidation | 1 time of | 2 times (one time) | 3 times of | 4 times (twice) | Total up to |
| Yield (g) | 59.5 | 33.4 | 21.2 | 4 | 118 |
It is seen from the table that the recovery rate of gold directly calcined in open hearth furnace is only 63.44%, without first decarbonizing and desulfurizing treatment.
Experiment two, selecting 15 tons of carbon-containing and arsenious gold ore with the grade of 5.35g/t and 3g/t respectively, processing by different process methods respectively, and cyaniding to extract gold to obtain different results shown in the following table.
Table three different technological process comparison experimental table
| Ore ore Quantity (t) | Grade (L) of a material (g/t) | Baking In a square form | Calcining in pool Grade (g/t) | Baking in a pool Amount of sand (t) | Put into a pool and contain Gold amount (g) | Amount of cyanide gold collected in human pond (g) | Recovering Gold (g) | Recovering Percentage (%) | ||
| 1 time of | 2 times (one time) | 3 times of | ||||||||
| 15 | 5.35 | Primary roasting in open hearth furnace | 5.8 | 14 | 81.2 | 23.5 | 15 | 10.45 | 48.95 | 61 |
| 15 | 3 | Vertical kiln and open hearth furnace Sublimation distillation furnace 2 Secondary roasting | 3.1 | 14.5 | 44.95 | 21.5 | 11.4 | 8 | 40.9 | 90 |
As can be seen from the above table, the secondary roasting process is adopted, firstly the decarbonization and the desulfurization are carried out in the vertical kiln, then the arsenic is removed in the open-hearth sublimation distillation furnace, the recovery rate can reach 90 percent, and the recovery rate can only reach 61 percent after the primary roasting is carried out in the open-hearth furnace, namely the cyanidation is carried out in the tank.
Experiment three: since 1993, the inventor made a lot of experimental studies, the design of the Wuyi open-hearth sublimation distillation furnace which consumes more than 600 tons of raw ore and cyanided tailings accumulated a lot of first-hand data, and part of the experimental data are listed below.
TABLE IV once roasting data table by open hearth
| Sequence of steps Number (C) | Mine Seed of a plant | Grade (L) of a material (g/t) | Before roasting | After roasting | Cyaniding in a pool Amount of roasted Sand (t) | Amount of money collected (g) | Recovery rate (％) | ||
| C(％) | As(％) | C(％) | As(％) | ||||||
| 1 | Tailings | 4 | 0.5 | 1.4 | 0.05 | 0.40 | 25 | 55 | 55.0 |
| 2 | Tailings | 3.5 | 0.48 | 1.35 | 0.07 | 0.43 | 20 | 40.3 | 57.8 |
| 3 | Tailings | 4.2 | 0.55 | 1.41 | 0.07 | 0.41 | 20 | 43.2 | 51.4 |
| 4 | Tailings | 3.9 | 0.53 | 1.37 | 0.08 | 0.40 | 20 | 39.5 | 50.6 |
| 5 | Tailings | 3.8 | 0.54 | 1.50 | 0.09 | 0.44 | 20 | 35.4 | 46.6 |
| 6 | Tailings | 3.3 | 0.50 | 1.30 | 0.06 | 0.35 | 20 | 30.2 | 45.8 |
| 7 | Tailings | 3.5 | 0.44 | 1.25 | 0.05 | 0.41 | 20 | 37.5 | 53.6 |
| 8 | Tailings | 4.5 | 0.56 | 1.45 | 0.07 | 0.50 | 20 | 49.3 | 54.8 |
| 9 | Tailings | 4.3 | 0.55 | 1.42 | 0.07 | 0.51 | 20 | 43.3 | 50.3 |
| 10 | Tailings | 4.0 | 0.58 | 1.35 | 0.04 | 0.33 | 20 | 58.5 | 73.1 |
| 11 | Tailings | 3.1 | 0.45 | 1.20 | 0.04 | 0.38 | 20 | 30.4 | 49.0 |
| 12 | Tailings | 3.3 | 0.45 | 1.30 | 0.05 | 0.45 | 20 | 34.4 | 52.1 |
| 13 | Tailings | 3.7 | 0.53 | 1.35 | 0.06 | 0.70 | 20 | 35.3 | 47.7 |
| 14 | Tailings | 3.4 | 0.59 | 1.45 | 0.10 | 0.60 | 20 | 30.5 | 44.9 |
| 15 | Tailings | 3.7 | 0.50 | 1.40 | 0.06 | 0.50 | 20 | 37.4 | 50.5 |
| 16 | Tailings | 3.3 | 0.50 | 1.40 | 0.07 | 0.60 | 20 | 30.5 | 46.2 |
| 17 | Tailings | 3.5 | 0.50 | 1.40 | 0.08 | 0.70 | 20 | 29.5 | 42.1 |
| 18 | Tailings | 3.1 | 0.40 | 1.10 | 0.04 | 0.45 | 20 | 30.2 | 48.7 |
| 19 | Tailings | 3.4 | 0.50 | 1.20 | 0.06 | 0.47 | 20 | 35.5 | 52.2 |
| 20 | Tailings | 3.9 | 0.54 | 1.30 | 0.05 | 0.39 | 20 | 50.7 | 65.0 |
| 21 | Tailings | 3.4 | 0.54 | 1.35 | 0.06 | 0.44 | 20 | 35.7 | 52.5 |
| 22 | Tailings | 3.7 | 0.51 | 1.40 | 0.07 | 0.43 | 20 | 38.5 | 52.0 |
| 23 | Tailings | 3.8 | 0.54 | 1.40 | 0.06 | 0.44 | 20 | 39.3 | 51.7 |
| 24 | Tailings | 3.2 | 0.50 | 1.35 | 0.06 | 0.33 | 20 | 34.4 | 53.8 |
| 25 | Raw ore | 6.2 | 0.80 | 1.75 | 0.08 | 0.45 | 30 | l18.0 | 63.4 |
| 26 | Raw ore | 5.5 | 20 | 65.0 | 59.0 | ||||
Fifth, adopt the secondary roasting data table of vertical kiln, open-hearth furnace sublimation distillation furnace
| Sequence of steps Number (C) | Mine Seed of a plant | Grade (L) of a material (g/t) | Before roasting | After the second roasting | Cyaniding in a pool Amount of roasted Sand (t) | Collecting gold Amount (%) | Recovering Percentage (%) | ||
| C(％) | As(％) | C(％) | As(％) | ||||||
| 1 | Raw | 3 | 0.80 | 1.45 | 0.08 | 0.30 | 15 | 40.2 | 89.3 |
| 2 | Raw ore | 5 | 0.75 | 1.50 | 0.05 | 0.35 | 15 | 68.5 | 91.3 |
| 3 | Raw ore | 5.5 | 0.80 | 1.55 | 0.06 | 0.38 | 15 | 73.5 | 89.1 |
| 4 | Raw ore | 6.98 | 0.85 | 1.45 | 0.07 | 0.34 | 15 | 93.5 | 89.3 |
A large number of tests show that the carbon content of the roasted product entering the tankfor cyaniding must be controlled to be below 0.1 percent, the effect is more ideal when the carbon content is controlled to be 0.03-0.05 percent, and the effect is better when the arsenic content is controlled to be below 0.5 percent and is controlled to be 0.30-0.40 percent.
Experiment four: the calcine roasted by the vertical kiln and the flat furnace sublimation distillation furnace and various elements of the raw ore change.
Table showing the change of six elements before and after secondary roasting
| Name (name) | C(％) | As(％) | S(％) | Al2O3(％) | SiO2(％) | Fe2O3(％) | Au(g/t) |
| Raw ore | 0.40 | 1.30 | 2.0 | 8.77 | 81.28 | 2.47 | 6.2 |
| First time vertical kiln roasting Calcined calcine | 0.05 | 1.40 | 0.3 | 8.9 | 82.50 | 3.10 | 6.3 |
| Second flat furnace type Baking furnace for sublimation distillation Calcined calcine | 0.03 | 0.4 | 0.1 | 9.3 | 83.4 | 3.20 | 6.5 |
As shown in the table, the content of C, S is reduced, and As and Al are contained2O3、SiO2、Fe2O3、AuThe content increases.
Experiment five: crushing sulfide ore containing antimony, arsenic and carbon to below 20 meshes, putting the crushed ore into a flat furnace type sublimation distillation furnace, isolating the crushed ore from air, heating to 1100-1200 ℃, and violently stirring to obtain Sb2S3Distilling off Sb in the calcine2S3When the content is controlled below 100ppm, the product can be discharged. Then placing the roasted sand balls into a vertical kiln for roasting, desulfurization and carbon, then placing the balls into a flat furnace type sublimation distillation furnace for removing arsenic, and finally placing the balls into a tank for cyanidation. The results are shown in the following table.
TABLE seventhly test processing data table for antimony, arsenic and carbon-containing ores
| Sequence of steps Number (C) | Mine Seed of a plant | Grade (L) of a material (g/t) | Before distillation | After distillation | Ore entering pool Stone (t) | Collecting gold Quantity (g) | Recovering Percentage (%) | ||||
| As2S3(％) | C(％) | Ab2S3(％) | As2S3(％) | C(％) | Sb2S3(％) | ||||||
| 1 | Raw ore | 8 | 1.3 | 0.5 | 0.8 | 1.0 | 0.45 | 0.01 | 1 | 6 | 75 |
| 2 | Raw ore | 9.5 | 1.35 | 0.5 | 0.7 | 1.1 | 0.48 | 0.015 | 1 | 7 | 73.7 |
| 3 | Raw ore | 8.5 | 1.33 | 0.5 | 0.75 | 1.05 | 0.47 | 0.02 | 1 | 6.9 | 81.2 |
The vertical kiln and the open-hearth sublimation distillation furnace used in the present invention will be further described with reference to the drawings and examples.
FIG. 1 is a front sectional view of a shaft kiln.
FIG. 2 is a schematic sectional front view of an open-hearth sublimation distillation furnace.
As shown in figure 1, the vertical kiln adopted in the invention has a cylindrical kiln body 1, an opening on the top surface, and a fire bar 2, a hearth 4 and a discharge hole 3 arranged below the kiln body.
As shown in figure 2, the open-hearth sublimation distillation furnace adopted in the invention is a tetragonal body, the furnace body 5 is divided into two layers, the upper layer is a space for stacking materials, the lower layer is provided with a flame path and a hearth, a chimney 7 is connected on the flame path of the lower layer, the material space of the upper layer is communicated with a U-shaped pipe 9, the U-shaped pipe is connected with a cloth bag, a material stirrer 6 which moves back and forth is designed in the material space, the material stirrer is in a comb-tooth shape, an eccentric wheel is designed at the tail end of a comb handle and is connected with power, a feeding hole 8 is designed at the top of the furnace body, and a discharging hole is designed at the side.
Compared with the prior art, the invention has the advantages that: (1) the equipment investment is low. The self-designed decarbonization and desulfurization vertical kiln and the open-hearth sublimation distillation furnace for removing arsenic and antimony have simple structure, easy manufacture and practicability and convenience in production. (2) The environmental benefit and the economic benefit are good. By recycling arsenic, not only is environmental pollution reduced, but also economic benefits are improved. As in the desulfurization and decarburization in the shaft kiln2S3By oxidation to As2O3During which there is some CO2、SO2As discharged to the air, but harmful to the environment2O3Instead of being discharged, As is distilled through an open-hearth sublimation distillation furnace2O3Sublimating, and collecting with cloth bag. The recovery rate of arsenic reaches more than 98 percent, and the As is accumulated and recovered in the previous experiments2O33.45 tons and the value is 1.8 ten thousand yuan. (3) The recovery rate of gold is high. In the production process, the contents of carbon, arsenic, antimony and other elements in the calcine are controlled, and the recovery rate can reach more than 90 percent. In summary, the pretreatment method for extracting gold has the advantages of simple process, less investment, environmental pollution reduction, high recovery rate and resource saving, and makes beneficial exploration on the treatment of refractory ores.
Claims (8)
1. A pretreatment method for extracting gold from refractory sulfide ore and carbonaceous ore, which adopts a direct roasting method by a vertical kiln or/and a flat furnace type sublimation distillation furnace respectively according to the difference of physical and chemical properties of elements contained in the gold ore.
2. The pretreatment method according to claim 1, wherein the gold ore mainly contains carbon and sulfur, and the pretreatment method comprises the following steps: crushing most of primary ores into 10-20 mm particles, crushing a small part of the primary ores into 1-5 mm particles, and loading the primary ores into a vertical kiln layer by layer, wherein the thickness of the first layer of ores containing 10-20 mm particles is 500-800 mm, the thickness of the second layer of ores covering 1-5 mm particles is 10-20 mm, and so on; after the ores are packed layer by layer, roasting in a vertical kiln; controlling the temperature at 700-800 ℃, and roasting at high temperature for 24-36 hours, wherein if the carbon and sulfur in the ore are insufficient, a small amount of pulverized coal can be added for supporting combustion, so that the oxidation degree of the ore reaches more than 98%; the carbon content of the calcine is controlled below 0.1 percent, and the sulfur content is controlled below 0.05 percent, and the calcine can be put into a tank for cyanidation.
3. The pretreatment method according to claim 2, wherein the calcine contains carbon in an amount of 0.03 to 0.05% and sulfur in an amount of 0.05% or less.
4. The pretreatment method according to claim 1, wherein refractory gold ore containing carbon and arsenic is adopted, and the pretreatment method comprises the following steps:
first decarburization, desulfurization and As formation2S3By oxidation to As2O3Crushing most of ores into 10-20 mm particles, crushing a small part of ores into 1-5 mm particles, and loading the crushed ores into a vertical kiln in layers, wherein the thickness of the ores filled with 10-20 mm particles on the first layer is 500-800 mm, the thickness of the ores covered with 1-5 mm particles on the second layer is 10-20 mm, and so on; after being assembled layer by layer, the process is carried out in a vertical kilnRoasting; controlling the temperature at 700-800 ℃, and roasting at high temperature for 24-36 hours; if the sulfur and carbon in the ore are insufficient, a small amount of pulverized coal can be added for combustion supporting, so that the oxidation degree of the ore reaches more than 98 percent; in the calcineThe carbon content is controlled below 0.1%, and the sulfur content is controlled below 0.05%.
And a second step of removing arsenic, namely crushing the roasted sand roasted in the vertical kiln in the first step to below 20 meshes, and putting the crushed sand into a flat furnace sublimation distillation furnace for secondary roasting, wherein the roasted sand is basically isolated from air, the temperature is controlled to be 200-210 ℃, and the roasted sand is stirred while being heated to enable As to be in contact with the air2O3Forming a gas phase, pumping the furnace gas into a cooler, and condensing As from the gas phase2O3Collecting with cloth bag; calcine, As, produced in the second stage of calcination2O3The content is controlled below 0.5 percent, and the gold can be extracted in a cyanidation pool.
5. The pretreatment method according to claim 4, wherein after the first step of roasting in the vertical kiln, the carbon content in the roasted product is controlled to be 0.03-0.05%, and the sulfur content is controlled to be less than 0.05%; in the second step, As is contained in the calcine produced by roasting in open-hearth sublimation distillation furnace2O3The content is controlled to be 0.3-0.4%.
6. The pretreatment method according to claim 1, wherein sulfide ore containing antimony, arsenic and carbon is used, and the pretreatment method comprises the following steps:
firstly, removing antimony, crushing crude ore to below 20 meshes, loading the crushed crude ore into a flat furnace type sublimation distillation furnace, basically isolating the ore from air after the ore enters the furnace, controlling the temperature to be 1100-1200 ℃, and simultaneously stirring vigorously to obtain Sb2S3Evaporating to vapor state, pumping furnace vapor into cooling system, and collecting Sb with cloth bag2S3Sb in calcine2S3The content of (A) must be controlled below 100 ppm;
second step of desulfurization, decarburization to make As2S3By oxidation to As2O3Preparing the roasted product obtained in the first step into 10-20 mm balls, roasting in a vertical kiln, controlling the temperature at 700-800 ℃, and roasting at a high temperature for 24-36 hours, wherein if the roasted product contains insufficient sulfur and carbon, a small amount of pulverized coal can be added to support combustion, so that the oxidation degree of the roasted product reaches more than 98%; by this step of roasting in a shaft kilnSand of carbon in whichThe content is controlled to be 0.03-0.05%, and the content of sulfur is controlled to be less than 0.05%;
thirdly, removing arsenic, crushing the roasted sand after the second roasting in a vertical kiln to below 20 meshes, putting the crushed sand into a flat furnace sublimation distillation furnace for the third roasting, controlling the temperature to be 200-210℃, basically isolating the roasted sand from air during roasting, and stirring while heating to ensure that As is2O3Sublimating into a gaseous phase, drawing the furnace gas into a cooler, and condensing As from the gaseous phase2O3Collecting with cloth bag; in the calcine produced by this roasting, As2O3The content is controlled to be 0.3-0.4%.
7. A shaft kiln for use in the pretreatment method of claim 1, 2, 3, 4, 5 or 6, characterized in that: the kiln body [1]is cylindrical, the top surface is an opening, and a fire bar [2], a hearth [4]and a discharge port [3]are designed below the kiln body.
8. An open-hearth sublimation distillation furnace for use in the pretreatment method of claim 1, 4, 5 or 6, characterized in that: the furnace body [5]is a square body and is divided into two layers, the upper layer is a space for stacking materials, the lower layer is provided with a furnace chamber and a flame path, the lower flame path is connected with a chimney [7], the upper material space is communicated with a U-shaped pipe [9], the U-shaped pipe is connected with a cloth bag, a material stirrer which moves back and forth is arranged in the material space, the material stirrer is in a comb shape, the tail end of a comb handle is provided with an eccentric wheel, the eccentric wheel is connected with power, the top of the furnace body is provided with a feed inlet [8], and the side surface of the furnace body is provided with a discharge outlet.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101792857A (en) * | 2010-04-13 | 2010-08-04 | 李柏荣 | Process for refining metals from minerals |
| CN103205381A (en) * | 2013-04-01 | 2013-07-17 | 山东黄金归来庄矿业有限公司 | Decarbonizing and desulphurizing bacterium agent for difficultly-selected gold ore and application thereof |
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1996
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101792857A (en) * | 2010-04-13 | 2010-08-04 | 李柏荣 | Process for refining metals from minerals |
| CN103205381A (en) * | 2013-04-01 | 2013-07-17 | 山东黄金归来庄矿业有限公司 | Decarbonizing and desulphurizing bacterium agent for difficultly-selected gold ore and application thereof |
| CN103205381B (en) * | 2013-04-01 | 2014-05-07 | 山东黄金归来庄矿业有限公司 | Decarbonizing and desulphurizing bacterium agent for difficultly-selected gold ore and application thereof |
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