Summary of the invention
The present invention is directed to above problem, provide a kind of can be not influential to operator and environment, facility investment is little, product purity height, the production method of the high purity arsenic that tooling cost is low.
Technical scheme of the present invention is: adopt following steps:
1), the part by weight according to 1 to 1.5~4 heats raw material arsenic and raw material lead in crucible, Heating temperature is 330~550 ℃, to fully synthetic, makes lead arsenic alloy after the cooling;
2), connect a conically shaped at the above-mentioned crucible oral area that alloy is housed, it is inserted vacuum tank, adjust jar internal pressure to a 5~500Pa, to the vacuum tank heating, the corresponding crucible of vacuum tank position Heating temperature is 320~500 ℃, and the corresponding conically shaped of vacuum tank position Heating temperature is 250~350 ℃, continue about 7.5 ~ 10 hours, arsenic condenses on the sidewall on a top, makes purity and be 99.999% arsenic, makes lead arsenic alloy in crucible;
3), above-mentioned arsenic is taken out, insert a container, this container is established inlet, outlet, toward inlet mouth input argon gas, get rid of the air in the container, container is heated to 610~650 ℃, form arsenic steam and trace impurity steam, be that 0.04~0.05Mpa, flow are the hydrogen of 0.5L/S by the inlet mouth input pressure again, form mixed gas, the air outlet of container connects a feldspar English reacting pipe A;
4), above-mentioned mixed gas enters feldspar English reaction tubes A, it is 750~1100 ℃ that pipeline A is heated to temperature, gas enters a silica tube B who is connected with crystal reaction tube A by crystal reaction tube A;
5), silica tube B is heated to temperature is 350~400 ℃, is 99.99999% α type arsenic in the silica tube B inwall purity of condensing, and connects silica tube C behind silica tube B;
6), silica tube C do not heat, the gas in the silica tube B continues by silica tube C, arsenic steam remaining in the above-mentioned gas condenses at silica tube C inwall, forms β, γ type arsenic;
7), connect a vapor pipe, discharge tail gas behind the silica tube C;
8), at last, tail gas feeds molten alkali, handles discharging.
The sealing when heating of described crucible, and rotate.
The material of described container is quartzy.
Quartzy dividing plate is crisscross arranged in the described crystal reaction tube A.
The present invention combines the advantage of plumbous molten bath method and chlorination rectifying reduction method, and has overcome their shortcoming.Propose to form earlier arsenical lead, and sum up in test arsenic and plumbous best proportioning, the arsenic lead ratio is 1 to 1.5~4, from arsenical lead, the arsenic sublimation separation is come out again, isolated arsenic distils in nitrogen atmosphere and obtains purity is 7N arsenic, and with the supporting synthetic crucible of special use, vacuum tank, conically shaped, the quartzy sublimation pipe of nitrogen atmosphere of production method of the present invention, cost is low, less investment, its performance have guaranteed the present invention, and investment is little in industrialization is produced, production capacity is high, cost is low, quality is good.The present invention has also solved the big problem of high purity arsenic production scale of investment, uses investment seldom just can realize industrialization.
Arsenic and lead can form alloy in the stove of 360 ° of rotations uniformly, guaranteed that impurity fully forms alloy with lead in the arsenic, thereby changed the rerum natura of impurity in the arsenic, improved the thermograde of principal element arsenic and impurity, make the arsenic impurities concentration removal of impurity lead of separating reach the same level of chlorination rectification method outward, remove impurity lead in the arsenic through nitrogen atmosphere distillation, make in the arsenic impurity such as Determination of Trace Sulfur, tellurium, oxygen of remnants when synthetic remove totallyer simultaneously, obtain the ultra-pure arsenic of 7N, the present invention will produce following positively effect.
At first, the present invention is mainly physical process, does not produce poisonous and hazardous intermediate compound, has thoroughly solved pollution problem and potential safety hazard, has realized green non-pollution production high purity arsenic.
Secondly, the present invention uses the quartz except that the oxygen atmosphere distillation, synthetic and separating device all is reusable special metal material manufacturing, do not re-use the silica glass of rapid wear piece, investment is reduced greatly, and producing 20 tons of 7N high purity arsenic production lines per year with investment is example, and the only domestic producing apparatus of chlorination rectifying will be invested about 2,000 ten thousand, and the present invention only needs about 5,000,000, and output investment ratio chlorination rectification method saves 75%.
Then, about 550,000 yuan/ton of comprehensive cost is produced in chlorination rectifying, and the present invention is owing to reduce quartzy loss in a large number, and the tailing after separating simultaneously can be done product and sell, and production cost is 250,000 yuan/ton, reduces by 55% than chlorination rectifying cost.
At last, chlorination rectifying does not have the proprietary technology of 7N product, in the product rule of thumb the middle part 1/3 be 7N, be 6N end to end, 7N product instability appears easily, the present invention is a 7N product special process, to go out product all be the 7N product, added value of product raising 30%.
Chlorination rectifying and quality examination comparison sheet of the present invention
Unit: PPm
| Impurity |
Ag | Al | Ga | Cu | Fe | Mg | Ni | Pb | Zn | Se | Cr | Sb | S | C |
Chlorination rectifying | 0.001 | 0.005 | 0.01 | 0.005 | 0.01 | 0.005 | 0.005 | 0.005 | 0.02 | 0.01 | 0.001 | 0.002 | 0.005 | 0.02 |
The present invention | 0.001 | 0.001 | 0.001 | 0.001 | 0.005 | 0.001 | 0.002 | 0.005 | 0.005 | 0.005 | 0.005 | 0.002 | 0.001 | 0.005 |
Produce the investment of 10 tons of 7N high purity arsenics, raw materials consumption, ton cost per year and pollute comparison sheet:
Method | Investment | Plumbous | Hydrogen | Chlorine | Quartzy | Raw material arsenic | The ton cost | Tailing and pollution |
Chlorination rectifying reduction method | 1,200 ten thousand yuan | | 5600 cubic metres | 700 cubic metres | 250 yuan/kilogram | 12 tons | 550,000 yuan | There are arsenic trichloride waste liquid, a large amount of hydrochloric acid tail gas, chlorine and arsenic trichloride to leak |
Production method of the present invention | 3,500,000 yuan | 40 tons | 600 cubic metres | | 50 yuan/kilogram | 16 tons | 250,000 yuan | There is the lead arsenic alloy that contains arsenic 15% to make product for 46 tons and sells no chemical pollution |
Embodiment
Embodiment 1
At first, raw material arsenic and raw material lead are prepared according to 1 to 1.5 part by weight, arsenic wherein is the particulate state of 1~2cm, both are inserted crucible, and sealed crucible heats crucible, Heating temperature is 330 ℃, in heat-processed, the material in the crucible is stirred or crucible is rotated,, make lead arsenic alloy after the cooling to fully synthetic; Crucible is inserted in the rotating electric furnace, and two outer side walls at electric furnace middle part are provided with rotating shaft, the axis horizontal of this rotating shaft, and perpendicular to the axis of electric furnace.The sublimation temperature of arsenic is 613 ℃, and plumbous melting temperature is 327.4 ℃.If plumbous arsenic total mass is 10Kg, when Heating temperature was 330 ℃, generated time was about 8 ~ 10 hours.Make lead arsenic alloy.
Then, connect a cone-shaped metal tube at the above-mentioned crucible oral area that alloy is housed, this shape is up big and down small, fuses with crucible, insert a vacuum tank, vacuumize, and to the vacuum tank heating, when pressure is 5Pa, corresponding crucible position Heating temperature is 320 ℃, corresponding conically shaped position Heating temperature is 250 ℃, by thermal radiation, material is heated.According to quality of material, choose different heat-up times, when material was 10Kg, about 7.5 ~ 10 hours of heat-up time, arsenic condensed on the sidewall on a top, made purity and be 99.999% arsenic.In crucible, make lead arsenic alloy.At this moment, the impurity in the 5N arsenic is mainly based on Pb, and the arsenic steam forms bubble separation and comes out in fused lead, minimum plumbous particulate is arranged with the arsenic condensation, and the Pb concentration in the arsenic is 0.5PPm.
Lead arsenic alloy separates purification arsenic, the vapour pressure that depends on alloy constituent element under the certain temperature, Fig. 1 is the vapour pressure of principal element arsenic and other elements, temperature contrast figure, as can be seen from Figure 200~400 ℃ of temperature, during pressure 10~300Pa, immediate with principal element arsenic is S and Se, other impurity are as Zn, Mg, Sb, Te, Ca, Pb etc. have bigger gradient with the vapour pressure and the temperature of principal element arsenic, the synthetic purpose is exactly to make the S very approaching with the vapour pressure of arsenic, Se and the plumbous compound Pb S that forms, the vapour pressure of the vapour pressure of PbSe and temperature and principal element forms bigger gradient, abandons the most difficult impurity S that removes thereby reach to remove, the purpose of Se.
Fig. 2 is the temperature relation contrast figure of the vapour pressure of principal element arsenic and PbS, PbSe, the fusing point of PbSe is 1065 ℃, there is not related data that the boiling point and relevant vapour pressure of PbSe are provided, in experiment, temperature is made as 600 ℃ during vapour pressure 10Pa, do not see in the product arsenic that Se exceeds standard, the volatilization temperature that PbSe when pressure is 10Pa is described is greater than 600 ℃.
Other are examined impurity A g, Al, Ca, Cu, Fe, Mg, Ni, Zn, Cr, Sb, C, form very big gradient once the temperature and the vapour pressure itself that are its element with principal element arsenic; The 2nd, with the synthetic high boiling intermetallic compound of lead, all stay in the fused lead, thereby reach the purpose of purification principal element arsenic.
Above-mentioned arsenic is taken out, insert a quartz container, volume is no more than 2/3 of container volume; This container is established air inlet/outlet, toward inlet mouth input argon gas, gets rid of the air in the container earlier,, blasts when feeding hydrogen and heating to prevent residual air.Container is heated to 610 ℃, and input pressure is that 0.04MPa, flow are the hydrogen of 0.5L/S in the container, and the air outlet of container connects a long reacting pipe; When temperature was 610 ℃, purity was that the arsenic of 5N can form steam, enters next reacting pipe jointly with hydrogen.Simultaneously, Determination of Trace Sulfur residual in 5N arsenic forms steam simultaneously, and the boiling point of sulphur is that 445 ℃ and arsenic steam, hydrogen enter next pipeline together.Lead, selenium and other metallic elements residual in the 5N arsenic can not gasify, and remain in this container.
Behind this container, connect a crystal reaction tube A, in this pipeline A, be staggeredly equipped with dividing plate, make and form S shape flowing lumen in the pipeline A; In the present embodiment, pipeline A is the coaxial three layers of silica tube that are provided with, and both ends of the surface are established end cap, and an end of innermost layer silica tube is established inlet mouth, open semicircle shape hole on the other end mouth of pipe place tube wall; The middle layer the other end is opened same hole; The outermost the other end is communicated with next pipeline.Temperature is heated to 750 ℃ in the crystal reaction tube A, and hydrogen energy and reaction of Salmon-Saxl under this temperature generate hydrogen sulfide, and this temperature is higher than the sublimation temperature of arsenic, and arsenic can not condense in this reaction tubes.
Above-mentioned gas enters a silica tube B from crystal reaction tube A outlet; Temperature is heated to be 350 ℃ in the silica tube B, and under this temperature, the arsenic in the gas condenses in the silica tube inwall, makes purity and be 99.99999% α type arsenic.At this moment, discharge in the gas of this pipeline B and be mainly hydrogen, be entrained with the hydrogen sulfide and the arsenic steam of trace.
Behind silica tube B, connect another silica tube C; The temperature that places of pipeline C does not heat less than 40 ℃ air, and residual arsenic in the above-mentioned gas is condensed into β, γ type arsenic on this grade duct wall.β, γ type arsenic can be used as the raw material of the inventive method.
Behind above-mentioned another silica tube C, connect a vapor pipe, discharge tail gas; Main component is a hydrogen in the tail gas, also is entrained with β, γ arsenic particles, the hydrogen sulfide of trace.
At last, above-mentioned tail gas is fed molten alkali, in the alkali lye energy and the hydrogen sulfide in the tail gas, β, γ arsenic particles form sodium arseniate by alkali lye the time, stay in the alkali lye.By the alkali lye expellant gas is hydrogen, feeds atmosphere.
Embodiment 2
At first, raw material arsenic and raw material lead are prepared according to 1 to 2.75 part by weight, arsenic wherein is the particulate state of 1~2CM, both are inserted crucible, and sealed crucible heats crucible, Heating temperature is 440 ℃, in heat-processed, the material in the crucible is stirred or crucible is rotated,, make lead arsenic alloy after the cooling to fully synthetic; Crucible is inserted in the rotating electric furnace, and two outer side walls at electric furnace middle part are provided with rotating shaft, the axis horizontal of this rotating shaft, and perpendicular to the axis of electric furnace.The sublimation temperature of arsenic is 613 ℃, and plumbous melting temperature is 321 ℃.If plumbous arsenic total mass is 10Kg, when Heating temperature was 440 ℃, generated time was about 5 ~ 6 hours.Make lead arsenic alloy.
Then, connect a cone-shaped metal tube at the above-mentioned crucible oral area that alloy is housed, this shape is up big and down small, fuses with crucible, insert a vacuum tank, vacuumize, and to the vacuum tank heating, when pressure is 260Pa, corresponding crucible position Heating temperature is 410 ℃, corresponding conically shaped position Heating temperature is 275 ℃, by thermal radiation, material is heated.According to quality of material, choose different heat-up times, when material was 10Kg, about 7.5 ~ 10 hours of heat-up time, arsenic condensed on the sidewall on a top, made purity and be 99.999% arsenic.In crucible, make lead arsenic alloy.At this moment, the impurity in the 5N arsenic is mainly based on Pb, and the arsenic steam forms bubble separation and comes out in fused lead, minimum plumbous particulate is arranged with the arsenic condensation, and the Pb concentration in the arsenic is 0.5PPm.
Lead arsenic alloy separates purification arsenic, the vapour pressure that depends on alloy constituent element under the certain temperature, Fig. 1 is the vapour pressure of principal element arsenic and other elements, temperature contrast figure, as can be seen from Figure 200~400 ℃ of temperature, during pressure 10~300Pa, immediate with principal element arsenic is S and Se, other impurity are as Zn, Mg, Sb, Te, Ca, Pb etc. have bigger gradient with the vapour pressure and the temperature of principal element arsenic, the synthetic purpose is exactly to make the S very approaching with the vapour pressure of arsenic, Se and the plumbous compound Pb S that forms, the vapour pressure of the vapour pressure of PbSe and temperature and principal element forms bigger gradient, abandons the most difficult impurity S that removes thereby reach to remove, the purpose of Se.
Fig. 2 is the temperature relation contrast figure of the vapour pressure of principal element arsenic and PbS, PbSe, the fusing point of PbSe is 1065 ℃, there is not related data that the boiling point and relevant vapour pressure of PbSe are provided, in experiment, temperature is made as 600 ℃ during vapour pressure 10Pa, do not see in the product arsenic that Se exceeds standard, the volatilization temperature that PbSe when pressure is 10Pa is described is greater than 600 ℃.
Other are examined impurity A g, Al, Ca, Cu, Fe, Mg, Ni, Zn, Cr, Sb, C, form very big gradient once the temperature and the vapour pressure itself that are its element with principal element arsenic; The 2nd, with the synthetic high boiling intermetallic compound of lead, all stay in the fused lead, thereby reach the purpose of purification principal element arsenic.
Above-mentioned arsenic is taken out, insert a quartz container, volume is no more than 2/3 of container volume; This container is established air inlet/outlet, toward inlet mouth input argon gas, gets rid of the air in the container earlier,, blasts when feeding hydrogen and heating to prevent residual air.Container is heated to 630 ℃, and input pressure is that 0.045MPa, flow are the hydrogen of 0.5L/S in the container, and the air outlet of container connects a long reacting pipe; When temperature was 630 ℃, purity was that the arsenic of 5N can form steam, enters next reacting pipe jointly with hydrogen.Simultaneously, Determination of Trace Sulfur residual in 5N arsenic forms steam simultaneously, and the boiling point of sulphur is that 445 ℃ and arsenic steam, hydrogen enter next pipeline together.Lead, selenium and other metallic elements residual in the 5N arsenic can not gasify, and remain in this container.
Behind this container, connect a crystal reaction tube A, in this pipeline A, be staggeredly equipped with dividing plate, make and form S shape flowing lumen in the pipeline A; In the present embodiment, pipeline A is the coaxial three layers of silica tube that are provided with, and both ends of the surface are established end cap, and an end of innermost layer silica tube is established inlet mouth, open semicircle shape hole on the other end mouth of pipe place tube wall; The middle layer the other end is opened same hole; The outermost the other end is communicated with next pipeline.Temperature is heated to 925 ℃ in the crystal reaction tube A, and hydrogen energy and reaction of Salmon-Saxl under this temperature generate hydrogen sulfide, and this temperature is higher than the sublimation temperature of arsenic, and arsenic can not condense in this reaction tubes.
Above-mentioned gas enters a silica tube B from crystal reaction tube A outlet; Temperature is heated to be 375 ℃ in the silica tube B, and under this temperature, the arsenic in the gas condenses in the silica tube inwall, makes purity and be 99.99999% α type arsenic.At this moment, discharge in the gas of this pipeline B and be mainly hydrogen, be entrained with the hydrogen sulfide and the arsenic steam of trace.
Behind silica tube B, connect another silica tube C; The temperature that places of pipeline C does not heat less than 40 ℃ air, and residual arsenic in the above-mentioned gas is condensed into β, γ type arsenic on this grade duct wall.β, γ type arsenic can be used as the raw material of the inventive method.
Behind above-mentioned another silica tube C, connect a vapor pipe, discharge tail gas; Main component is a hydrogen in the tail gas, also is entrained with β, γ arsenic particles, the hydrogen sulfide of trace.
At last, above-mentioned tail gas is fed molten alkali, in the alkali lye energy and the hydrogen sulfide in the tail gas, β, γ arsenic particles form sodium arseniate by alkali lye the time, stay in the alkali lye.By the alkali lye expellant gas is hydrogen, feeds atmosphere.
Embodiment 3
At first, raw material arsenic and raw material lead are prepared according to 1 to 4 part by weight, arsenic wherein is the particulate state of 1~2cm, both are inserted crucible, and sealed crucible heats crucible, Heating temperature is 550 ℃, in heat-processed, the material in the crucible is stirred or crucible is rotated,, make lead arsenic alloy after the cooling to fully synthetic; Crucible is inserted in the rotating electric furnace, and two outer side walls at electric furnace middle part are provided with rotating shaft, the axis horizontal of this rotating shaft, and perpendicular to the axis of electric furnace.The sublimation temperature of arsenic is 613 ℃, and plumbous melting temperature is 321 ℃.If plumbous arsenic total mass is 10Kg, when Heating temperature was 550 ℃, generated time was about 3 ~ 4 hours.Make lead arsenic alloy.
Then, connect a cone-shaped metal tube at the above-mentioned crucible oral area that alloy is housed, this shape is up big and down small, fuses with crucible, insert a vacuum tank, vacuumize, and to the vacuum tank heating, when pressure is 500Pa, corresponding crucible position Heating temperature is 500 ℃, corresponding conically shaped position Heating temperature is 350 ℃, by thermal radiation, material is heated.According to quality of material, choose different heat-up times, when material was 10Kg, about 7.5 ~ 10 hours of heat-up time, arsenic condensed on the sidewall on a top, made purity and be 99.999% arsenic.In crucible, make lead arsenic alloy.At this moment, the impurity in the 5N arsenic is mainly based on Pb, and the arsenic steam forms bubble separation and comes out in fused lead, minimum plumbous particulate is arranged with the arsenic condensation, and the Pb concentration in the arsenic is 0.5PPm.
Lead arsenic alloy separates purification arsenic, the vapour pressure that depends on alloy constituent element under the certain temperature, Fig. 1 is the vapour pressure of principal element arsenic and other elements, temperature contrast figure, as can be seen from Figure 200~400 ℃ of temperature, during pressure 10~300Pa, immediate with principal element arsenic is S and Se, other impurity are as Zn, Mg, Sb, Te, Ca, Pb etc. have bigger gradient with the vapour pressure and the temperature of principal element arsenic, the synthetic purpose is exactly to make the S very approaching with the vapour pressure of arsenic, Se and the plumbous compound Pb S that forms, the vapour pressure of the vapour pressure of PbSe and temperature and principal element forms bigger gradient, abandons the most difficult impurity S that removes thereby reach to remove, the purpose of Se.
Fig. 2 is the temperature relation contrast figure of the vapour pressure of principal element arsenic and PbS, PbSe, the fusing point of PbSe is 1065 ℃, there is not related data that the boiling point and relevant vapour pressure of PbSe are provided, in experiment, temperature is made as 600 ℃ during vapour pressure 10Pa, do not see in the product arsenic that Se exceeds standard, the volatilization temperature that PbSe when pressure is 10Pa is described is greater than 600 ℃.
Other are examined impurity A g, Al, Ca, Cu, Fe, Mg, Ni, Zn, Cr, Sb, C, form very big gradient once the temperature and the vapour pressure itself that are its element with principal element arsenic; The 2nd, with the synthetic high boiling intermetallic compound of lead, all stay in the fused lead, thereby reach the purpose of purification principal element arsenic.
Above-mentioned arsenic is taken out, insert a quartz container, volume is no more than 2/3 of container volume; This container is established air inlet/outlet, toward inlet mouth input argon gas, gets rid of the air in the container earlier,, blasts when feeding hydrogen and heating to prevent residual air.Container is heated to 650 ℃, and input pressure is that 0.05Mpa, flow are the hydrogen of 0.5L/S in the container, and the air outlet of container connects a long reacting pipe; When temperature was 650 ℃, purity was that the arsenic of 5N can form steam, enters next reacting pipe jointly with hydrogen.Simultaneously, Determination of Trace Sulfur residual in 5N arsenic forms steam simultaneously, and the boiling point of sulphur is that 445 ℃ and arsenic steam, hydrogen enter next pipeline together.Lead, selenium and other metallic elements residual in the 5N arsenic can not gasify, and remain in this container.
Behind this container, connect a crystal reaction tube A, in this pipeline A, be staggeredly equipped with dividing plate, make and form S shape flowing lumen in the pipeline A; In the present embodiment, pipeline A is the coaxial three layers of silica tube that are provided with, and both ends of the surface are established end cap, and an end of innermost layer silica tube is established inlet mouth, open semicircle shape hole on the other end mouth of pipe place tube wall; The middle layer the other end is opened same hole; The outermost the other end is communicated with next pipeline.Temperature is heated to 1100 ℃ in the crystal reaction tube A, and hydrogen energy and reaction of Salmon-Saxl under this temperature generate hydrogen sulfide, and this temperature is higher than the sublimation temperature of arsenic, and arsenic can not condense in this reaction tubes.
Above-mentioned gas enters a silica tube B from crystal reaction tube A outlet; Temperature is heated to be 400 ℃ in the silica tube B, and under this temperature, the arsenic in the gas condenses in the silica tube inwall, makes purity and be 99.99999% α type arsenic.At this moment, discharge in the gas of this pipeline B and be mainly hydrogen, be entrained with the hydrogen sulfide and the arsenic steam of trace.
Behind silica tube B, connect another silica tube C; The temperature that places of pipeline C does not heat less than 40 ℃ air, and residual arsenic in the above-mentioned gas is condensed into β, γ type arsenic on this grade duct wall.β, γ type arsenic can be used as the raw material of the inventive method.
Behind above-mentioned another silica tube C, connect a vapor pipe, discharge tail gas; Main component is a hydrogen in the tail gas, also is entrained with β, γ arsenic particles, the hydrogen sulfide of trace.
At last, above-mentioned tail gas is fed molten alkali, in the alkali lye energy and the hydrogen sulfide in the tail gas, β, γ arsenic particles form sodium arseniate by alkali lye the time, stay in the alkali lye.By the alkali lye expellant gas is hydrogen, feeds atmosphere.