CN101906530A - Continuous microwave fluidized-bed roasting process - Google Patents
Continuous microwave fluidized-bed roasting process Download PDFInfo
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- CN101906530A CN101906530A CN 201010229476 CN201010229476A CN101906530A CN 101906530 A CN101906530 A CN 101906530A CN 201010229476 CN201010229476 CN 201010229476 CN 201010229476 A CN201010229476 A CN 201010229476A CN 101906530 A CN101906530 A CN 101906530A
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Abstract
The invention discloses a continuous microwave fluidized-bed roasting process which is characterized in that the prepared material to be roasted is fed into a continuous microwave fluidized-bed roaster through a sealed screw feeder; a microwave source radiates microwaves into a resonant cavity; because the material contains sulfide ores, oxidized ores and carbonate minerals with higher dielectric constants, the material to be roasted is quickly heated after the material absorbs the microwaves; when the temperature is higher than the set value, the circuit is automatically switched off, the microwave source stops radiating the microwaves, and the temperature of the material falls; when the temperature is lower than the set value, the circuit is automatically switched on, the microwave source works to radiate the microwaves, and the temperature of the material rises; after entering an air chamber, the gas is fed into a material layer in a fluidized roasting chamber; and after the material is kept at the set temperature and for the set time under microwave radiation, the material is discharged from a discharge opening to obtain the roasted sand. The process of the invention solves the problems that when the conventional fluidized-bed roasting process is used for roasting sulfur-containing ores with low gold content, fuels such as coal and the like need to be added, and the low-temperature roasting process can not be carried out easily; and the process of the invention also solves the problem of uneven roasting in the existing microwave high-temperature continuous roasting process.
Description
Technical field
The present invention relates to a kind of sinter process of refractory gold ore, particularly a kind of continuous microwave fluidized-bed roasting process.
Background technology
Along with the fast development of China's gold industry, be easy to the gold ore resource exhaustion day by day that direct cyaniding is extracted, the difficult-treating gold mine resource has become the main raw material of gold industry from now on.Therefore, sinter process is applied rapidly in gold production and develops.Though, sinter process and effect are all improved to some extent with perfect, but still have that temperature applicable range is limited, rate of roasting is slow, roasting is inhomogeneous and problem such as roasting effect is relatively poor at every turn, need be improved and perfect along with the generation of novel stoving oven.
The fluidized-bed roasting process that obtains more application in recent years has the unrivaled advantage of many other technologies, as the intensity of roasting height, the residual sulphur of slag is low, the siege temperature is even, furnace binding is simple, no-rotary part etc., but also exists limitation in actual production.Fluidized-bed roasting process is when roasted concentrate, be that sulphur oxidizing reaction heat release by concentrate self reaches and keeps certain maturing temperature, therefore, when the lower concentrate of roasting raw ore and some sulfur-bearings, often need to add fuel such as coal and keep maturing temperature, this has increased production cost undoubtedly; Simultaneously, sulphur and coal burning-point height, heat release is wayward, usually causes maturing temperature higher, therefore needs the material of low-temperature bake for some, and conventional fluidized-bed roasting process is difficult for realizing.
Carry out microwave radiation heating is a kind of metallurgical new technology that development in recent years is got up, and has that heating is fast, thermo-efficiency is high, cleanliness without any pollution, starts and stop to heat very fast, is convenient to advantages such as control automatically.Valuable mineral mainly is divided into two big classes in the ore: sulphide ores and oxidized ore.Result of study shows that most of sulphide oress and the partial oxidation ore deposit temperature rise rate in microwave field is very fast, also is a kind of extraordinary microwave absorbing material and in cyanidation-leaching process gold is produced absorption, causes the low carbonate minerals of gold recovery.Utilize mineral these characteristics in microwave field, mineral are carried out microwave calcining, can reach the toxic mineral oxidation removal, gold exposes and dissociates, and improves the purpose of gold recovery.
But, the continuous roasting technology of present microwave high-temperature, in order to reach the purpose of continuous-feeding, usually adopt the fixing mode of carrying continuously of material, because material is that relative fixed is motionless, when externally material and surrounding environment are carried out heat exchange, the energy that materials inside is gathered can not in time conduct out, therefore, it is burned and center material agglomerating phenomenon need be improved usually to produce peripheral material.
Summary of the invention
The object of the present invention is to provide a kind of continuous microwave fluidized-bed roasting process, microwave technology and conventional fluidized-bed roasting process are organically combined.This continuous microwave fluidized-bed roasting process has solved conventional fluidized-bed roasting process need add fuel such as coal, be difficult for low-temperature bake at the low Gold Ore of roasting sulfur-bearing problem, has solved the uneven problem of roasting that the continuous sinter process of microwave high-temperature exists again.
Technical scheme of the present invention is: the material of ready desire roasting is fed the continuous microwave fluidized-bed roasting stove by the screw feeder that seals, the microwave source microwave radiation is to resonator cavity or body of heater, owing to contain the higher sulphide ores of specific inductivity, oxidized ore and carbonate minerals in the material, after absorbing microwave, promptly heat up rapidly, when temperature is higher than set(ting)value, the circuit automatic opening, microwave source stops microwave radiation, and temperature of charge begins to descend; When temperature is lower than set(ting)value, the circuit automatic switching on, microwave source work, the beginning microwave radiation, temperature of charge rises; After the gas of being gone into by the air feed confession enters air compartment, feed material bed in the fluosolids roasting chamber equably by blast cap again; Behind the temperature and time that material has kept setting under microwave radiation, discharge, be calcining from discharge gate.Resonator cavity has certain length, can guarantee that material has enough roasting time; After material absorbs microwave and heats up, after the gas effect that infeeds by air distribution plate, between the particle and the relative movement that produces between particle and the air bigger, gas diffusion velocity is fast in addition, thermal conduction is fast between the material, and therefore whole material layer temperature is even, can obtain satisfied roasting effect; Opening for feed, discharge gate and floss hole at resonator cavity are equipped with the microwave suppressor, prevent that microwave leakage from exceeding standard.
Concrete steps of the present invention are:
(1) the roasting material is prepared
The grinding particle size of control ore is between P60%=0.015mm～P95%=0.043mm;
(2) roasting operation
Ready material is fed the continuous microwave fluidized-bed roasting stove by the screw feeder that seals, according to the requirement of ore character, conditions such as strict control fluidization of material speed, maturing temperature, oxygen-supplying amount; The microwave source microwave radiation is to resonator cavity or body of heater, and material heats up rapidly after absorbing microwave, when temperature is higher than set(ting)value, and the circuit automatic opening, microwave source stops microwave radiation, and temperature begins to descend; When temperature is lower than set(ting)value, the circuit automatic switching on, microwave source work, the beginning microwave radiation, temperature of charge rises; After the gas of being gone into by the air feed confession enters air compartment, feed material bed in the fluosolids roasting chamber equably by blast cap again; Behind the temperature and time that material has kept setting under microwave radiation, discharge, be calcining from discharge gate; The flue gas that roasting produces is discharged by flue;
(3) Jin extraction
Calcining extracts gold through conventional cyanidation technology and smelting technology.
The invention has the beneficial effects as follows: solved conventional fluidized-bed roasting process need add fuel such as coal, be difficult for low-temperature bake when the low Gold Ore of roasting sulfur-bearing problem, problems such as roasting that the continuous sinter process of existing microwave high-temperature exists is inhomogeneous have been solved again, solved effectively that material has improved golden leaching yield to the different requirements of roasting condition in the roasting process.
Embodiment:
Embodiment 1:
(1), southwestern gold mine first, carbonaceous sulfide particulate dip-dye type refractory gold ore, by dry milling technology, control grinding fineness-0.074mm, content 80%;
(2), bubbling air, by the microwave radiation ore, control maturing temperature be 450 ℃, roasting time is 45min, the calcining sulfur oxidation rate is 80.36%, the organic carbon decreasing ratio is 88.27%;
(3), calcining is through conventional cyanidation technology, gold leaching rate is increased to 82.72% by 1.90%.
Embodiment 2:
(1), southwestern gold mine second, carbonaceous sulfide particulate dip-dye type refractory gold ore, by dry milling technology, control grinding fineness-0.074mm, content 60%;
(2), bubbling air, by the microwave radiation ore, control maturing temperature be 680 ℃, roasting time is 40min, the calcining sulfur oxidation rate is 90.53%, the organic carbon decreasing ratio is 92.81%;
(3), calcining is milled to-0.074mm, content 80%, through conventional cyanidation technology, gold leaching rate is increased to 80.29% by 0.74%.
Embodiment 3:
(1), western certain gold mine, the few difficult gold containing ore flotation of the sulfide micro-grain impregnation rough concentrate of carbon containing, fineness-0.043mm, content 85%;
(2), bubbling air, be 600 ℃ by microwave radiation ore control maturing temperature, roasting time is 45min, sulfur oxidation rate is 91.80%, the organic carbon decreasing ratio is 85.16%;
(3), calcining is through conventional cyanidation technology, gold leaching rate is increased to 79.38% by 0.45%.
Claims (1)
1. continuous microwave fluidized-bed roasting process, this technology is that the material of the ready desire roasting screw feeder by sealing is fed the continuous microwave fluidized-bed roasting stove, the microwave source microwave radiation is to resonator cavity or body of heater, owing to contain the higher sulphide ores of specific inductivity, oxidized ore and carbonate minerals in the material, the material of desiring roasting promptly heats up rapidly after absorbing microwave, when temperature is higher than set(ting)value, and the circuit automatic opening, microwave source stops microwave radiation, and temperature of charge begins to descend; When temperature is lower than set(ting)value, the circuit automatic switching on, microwave source work, the beginning microwave radiation, temperature of charge rises; After the gas of being gone into by the air feed confession enters air compartment, feed material bed in the fluosolids roasting chamber equably by blast cap again; Behind the temperature and time that material has kept setting under microwave radiation, discharge from discharge gate, be calcining, the flue gas that roasting produces is discharged by flue.
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| CN 201010229476 CN101906530A (en) | 2010-07-19 | 2010-07-19 | Continuous microwave fluidized-bed roasting process |
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| CN 201010229476 CN101906530A (en) | 2010-07-19 | 2010-07-19 | Continuous microwave fluidized-bed roasting process |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102758081A (en) * | 2012-07-25 | 2012-10-31 | 福建省双旗山矿业有限责任公司 | Method for microwave plasma roasting and non-cyanogen gold leaching of sulfur-bearing gold mineral |
| CN102758080A (en) * | 2012-07-25 | 2012-10-31 | 福建省双旗山矿业有限责任公司 | Method for microwave roasting and non-cyanogen gold leaching of sulfur-bearing gold mineral |
| CN108504854A (en) * | 2018-05-08 | 2018-09-07 | 杨光华 | A kind of method of phase transformation ore dressing |
| CN108796211A (en) * | 2017-04-26 | 2018-11-13 | 云南民族大学 | A kind of method and calciner of the high titanium slag desulfurization of microwave fluosolids roasting |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201715859U (en) * | 2010-05-07 | 2011-01-19 | 长春黄金研究院 | Continuous microwave fluidized-bed roaster |
-
2010
- 2010-07-19 CN CN 201010229476 patent/CN101906530A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201715859U (en) * | 2010-05-07 | 2011-01-19 | 长春黄金研究院 | Continuous microwave fluidized-bed roaster |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102758081A (en) * | 2012-07-25 | 2012-10-31 | 福建省双旗山矿业有限责任公司 | Method for microwave plasma roasting and non-cyanogen gold leaching of sulfur-bearing gold mineral |
| CN102758080A (en) * | 2012-07-25 | 2012-10-31 | 福建省双旗山矿业有限责任公司 | Method for microwave roasting and non-cyanogen gold leaching of sulfur-bearing gold mineral |
| CN102758081B (en) * | 2012-07-25 | 2013-12-18 | 福建省双旗山矿业有限责任公司 | Method for microwave plasma roasting and non-cyanogen gold leaching of sulfur-bearing gold mineral |
| CN102758080B (en) * | 2012-07-25 | 2014-01-15 | 福建省双旗山矿业有限责任公司 | Method for microwave roasting and non-cyanogen gold leaching of sulfur-bearing gold mineral |
| CN108796211A (en) * | 2017-04-26 | 2018-11-13 | 云南民族大学 | A kind of method and calciner of the high titanium slag desulfurization of microwave fluosolids roasting |
| CN108504854A (en) * | 2018-05-08 | 2018-09-07 | 杨光华 | A kind of method of phase transformation ore dressing |
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Open date: 20101208 |