Processing technology for producing yellow phosphorus furnace charge by using phosphorite powder machine-made pellet submerged arc furnace

Abstract

The invention discloses a processing technology for producing yellow phosphorus furnace charge by using a phosphorite powder machine-made pellet submerged arc furnace, and relates to the technical field of phosphorus processing, and the processing technology comprises the following steps: S1, preparing raw materials; s2, mixing and stirring; s3, pressing and forming; and S4, drying, roasting, and cooling and warehousing the pellets. S5, tail gas treatment; the processing technology for producing the yellow phosphorus furnace charge by the phosphorite powder machine-made pellet submerged arc furnace has the beneficial effects that the low-grade phosphorite powder is successfully converted into the high-quality yellow phosphorus production furnace charge through the steps of raw material proportioning, mixing and stirring, forced forming and high-temperature calcining, so that the effective utilization of the low-grade powdered ore is realized; compared with lump ore furnace charge, the method has the advantages that the power consumption for producing single ton of yellow phosphorus is effectively reduced, and meanwhile, the pellet furnace charge is roasted to remove impurities, so that the working condition environment in the electric furnace is improved. The production efficiency and quality of yellow phosphorus are improved, the production cost and pollution emission are reduced, and the method has extremely high use value.

Description

Technical Field

[0001] The invention relates to the technical field of phosphorus processing, in particular to a processing technology for producing yellow phosphorus furnace charge by using a phosphate rock powder pelletizing ore-fired furnace. Background Art

[0002] In the production process of yellow phosphorus in electric furnace, phosphate rock powder is a phosphate resource that cannot be used directly. However, in the existing project of producing yellow phosphorus by electric furnace, the yield of phosphate rock powder is about 8%, or even higher, and the P2O5 content is lower than 20% of the ore fed into the furnace. The recycling of such phosphate resources is a very valuable research. For this reason, we proposed a processing technology for producing yellow phosphorus charge in electric furnace with phosphate rock powder pellets. Summary of the invention

[0003] In view of the shortcomings of the prior art, the present invention provides a processing technology for producing yellow phosphorus charge in a phosphate rock pelletizing ore-fired furnace, which solves the problems raised in the above background technology.

[0004] To achieve the above purpose, the present invention is implemented by the following technical scheme: a processing technology for producing yellow phosphorus charge in a phosphate rock pelletizing ore-fired furnace, comprising the following steps: S1. Raw material preparation, including phosphate rock powder, high-grade phosphate concentrate, solid binder, and liquid binder, with the weight percentage of phosphate rock powder being 65% to 70%, high-grade phosphate concentrate being 15% to 20%, solid binder being 5% to 8%, and liquid binder being 10% to 15%; S2. Mixing and stirring: Take phosphate rock powder, high-grade phosphate concentrate, and solid binder and stir them in a closed forced mixer to fully mix the materials. Then use a mixer to stir and mix them for the second time. At the same time, add liquid binder at a ratio of 10% to 15% of the material and continue stirring until the moisture of the materials is completely penetrated; S3. Pressing and forming: The mixed material is fed into an 80t hydraulic forming machine for forced forming; S4. Drying, roasting, cooling and storage of pellets: The formed pellets are sent to the baking integrated furnace by a box conveyor for dehydration, defluorination and desulfurization to improve the strength of the pellets. The baking time is based on the defluorination rate.

[0005] S5. Tail gas treatment: The tail gas is purified by two-stage spraying, and the purified waste liquid recovers fluorine and chlorine to form secondary products and mobile phones. The rear liquid returns to the mixing process to purify the tail gas, denitrify and de-whiten to meet the emission standards.

[0006] Furthermore, in the present invention, the interior of the integrated baking furnace in S4 is a material cooling zone and a waste heat exchange zone.

[0007] In the present invention, the particle size of the forced forming in S3 is further 30 mm ± 3 mm.

[0008] In the present invention, the calcination temperature in S4 is 900-1000° C., and the calcination time is 120-180 minutes.

[0009] In the present invention, the initial stirring time in S2 is 10 minutes, and the secondary stirring time is 15 minutes.

[0010] The present invention provides a processing technology for producing yellow phosphorus charge by using a phosphate rock powder pelletizing ore-fired furnace, which has the following beneficial effects: 1. The processing technology of the phosphate rock powder machine pelletizing ore-fired furnace for producing yellow phosphorus charge successfully converts low-grade phosphate rock powder into high-quality yellow phosphorus production charge through the steps of raw material proportioning, mixing and stirring, forced molding, and high-temperature calcination, realizing the effective utilization of low-grade powder ore and improving the comprehensive utilization rate of phosphate rock resources. Compared with lump ore charge, it effectively reduces the power consumption per ton of yellow phosphorus production. At the same time, the pelletizing charge is roasted and decontaminated, which improves the working environment in the electric furnace. It improves the production efficiency and quality of yellow phosphorus, reduces production costs and pollution emissions, and has extremely high use value. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the process of the present invention. DETAILED DESCRIPTION

[0012] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0013] Embodiment 1 See also Figure 1 The present invention provides a technical solution: a process for producing yellow phosphorus charge by using a phosphate rock powder pelletizing ore-fired furnace, comprising the following steps: 1. Raw materials preparation: Phosphate rock powder is used as the main raw material, with a weight percentage of 65% to 70%. High-grade phosphate concentrate is 15% to 20%. At the same time, 5% to 8% of solid binder is added.

[0014] 2. Mixing Use a belt electronic metering conveyor to measure and transport the materials to the mixer. Stir the materials in a closed forced mixer for 10 minutes to fully mix the materials. After the materials are mixed, perform a second mixing. At the same time, add a liquid adhesive with a material ratio of 10% to 15%. Continue stirring for 15 minutes until the moisture of the materials is fully penetrated. During the operation, dust is collected by a pulse dust collector. 3. Pressing and forming: The uniformly mixed materials in step 2 are fed into an 80t hydraulic forming machine for forced forming, and the particle size is 30mm±3mm.

[0015] 4. Drying, roasting, pellet cooling and storage: The formed pellets obtained in step 3 are sent to the baking integrated furnace by a box conveyor for dehydration, defluorination and desulfurization, and the strength of the pellets is improved at the same time. This operation is the key to the pelletizing process indicators meeting the standards. The baking time is based on the defluorination rate. The three zones of the integrated furnace are the material cooling zone and also the waste heat exchange zone; 5. Transportation and collection: The formed pellets prepared in step 4 are conveyed to the phosphorus furnace feed bin by a belt conveyor for collection.

[0016] Embodiment 2, a process for producing yellow phosphorus charge by using a phosphate rock pelletizing furnace, comprises the following steps: 1. Raw materials preparation: The proportion of flotation phosphate concentrate or crushed phosphate ore with a particle size less than 15mm and phosphate rock powder for ball making: By weight percentage name Phosphate concentrate Crushed Phosphate Rock Phosphate rock powder Adhesives 1# Group 20%~25% 10%~15% 50%~55% 10%~12% 2# Group 25%~35% 0%~5% 45%~60% 8%~10% 3# Group 35%~45% 0%~0% 50%~55% 8%~10% 4# Group 15%~20% 0%~0% 60%~65% 5%~8% 2. Mixing and stirring: The materials are put into a closed forced mixer according to the above material ratio, and the adjusted waste phosphoric acid (PH: 1-2) is added according to the humidity of 10%-15%, and mixed and stirred. After the materials are fully mixed and moistened (PH: 6-7), they are put into the ore pile trough; 3. Pressing molding: After pretreatment, the material is transported to the silo by a loader and sent to an 80t hydraulic forming machine for pelletizing via a belt conveyor. The raw pellets are qualified if their compressive strength is greater than 95kg. 4. Drying and roasting: The formed pellets are sent to the baking integrated furnace through a box conveyor for drying and roasting. The roasting temperature is 900-1000℃ and the roasting time is 120-180 minutes. The pellets with compressive strength greater than 170kg are obtained; 5. Environmental protection treatment of baking waste gas: The exhaust gas from the integrated baking furnace is recovered through dust collection and returned to the pelletizing process (dust return rate ≤ 0.5%). The exhaust gas is purified through two-stage spraying, and the purified waste liquid is used to recover fluorine and chlorine to form secondary products that enter the market. The liquid is then returned to the mixing process to purify the exhaust gas, remove NOx and whiten the waste gas to meet emission standards.

[0017] Finally, a few points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, which may refer to mechanical connection or electrical connection, or internal communication between two components, or direct connection. "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may change; Secondly: In the drawings of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other; Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A process for producing yellow phosphorus charge by using a phosphate rock pelletizing furnace, characterized in that: The following steps are involved: S1. Raw material preparation, including phosphate rock powder, high-grade phosphate concentrate, solid binder, and liquid binder, with the weight percentage of phosphate rock powder being 65% to 70%, high-grade phosphate concentrate being 15% to 20%, solid binder being 5% to 8%, and liquid binder being 10% to 15%; S2. Mixing and stirring: Take phosphate rock powder, high-grade phosphate concentrate, and solid binder and stir them in a closed forced mixer to fully mix the materials. Then use a mixer to stir and mix them for the second time. At the same time, add liquid binder at a ratio of 10% to 15% of the material and continue stirring until the moisture of the materials is completely penetrated; S3. Pressing and forming: The mixed material is fed into an 80t hydraulic forming machine for forced forming; S4. Drying, roasting, pellet cooling and storage: the formed pellets are sent to the baking integrated furnace by a box conveyor for dehydration, defluorination and desulfurization to improve the strength of the pellets. The baking time is based on the defluorination rate; S5. Tail gas treatment: The tail gas is purified by two-stage spraying, and the purified waste liquid recovers fluorine and chlorine to form secondary products and mobile phones. The rear liquid returns to the mixing process to purify the tail gas, denitrify and de-whiten to meet the emission standards.

2. The process for producing yellow phosphorus charge by using a phosphate rock pelletizing furnace according to claim 1 is characterized in that: The interior of the integrated baking furnace in S4 is a material cooling area and a waste heat exchange area.

3. The process for producing yellow phosphorus charge by using a phosphate rock pelletizing furnace according to claim 1, characterized in that: The particle size of the forced molding in S3 is 30 mm ± 3 mm.

4. The process for producing yellow phosphorus charge by using a phosphate rock pelletizing furnace according to claim 1, characterized in that: The calcination temperature in S4 is 900-1000° C., and the calcination time is 120-180 minutes.

5. The process for producing yellow phosphorus charge by using a phosphate rock pelletizing furnace according to claim 1, characterized in that: The initial stirring time in S2 is 10 minutes, and the secondary stirring time is 15 minutes.

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