CN-120481077-B - Phosphogypsum harmless treatment device, phosphogypsum harmless treatment process and phosphogypsum harmless treatment application

CN120481077BCN 120481077 BCN120481077 BCN 120481077BCN-120481077-B

Abstract

The invention relates to the technical field of phosphogypsum building new material production, in particular to a phosphogypsum innocent treatment device, a treatment process and application thereof, wherein the device comprises an aggregate bin, a powder stirrer, a conveyor, a mixing stirrer, a discharging bin and a reservoir, a phosphogypsum curing and air drying integrated machine and a phosphogypsum raw material crusher, the phosphogypsum innocent treatment is realized by the device with the structure, the phosphogypsum is crushed and subjected to innocent treatment by arranging a phosphogypsum raw material crusher, a phosphogypsum curing and air drying integrated machine and other equipment in a treatment device, so that the phosphogypsum can be uniformly mixed with other building materials, the quality of products is improved, and a phosphogypsum innocent treatment process is designed, so that a complete and popularization new technology is formed from manufacturing to application of the materials formed by the process, and the industrialized and large-scale application performance is achieved.

Inventors

FAN LI
GAN WEI
WANG JIAN
YUAN SHENG
LIU JIANGYAN
WANG MINGXING

Assignees

重庆市生态环境科学研究院

Dates

Publication Date: 20260508
Application Date: 20250523

Claims (10)

1. The phosphogypsum innocent treatment device comprises an aggregate bin, a powder stirrer, a conveyor, a mixing stirrer, a discharging bin and a reservoir, wherein the conveyor is communicated with a discharging end of the aggregate bin and a feeding end of the mixing stirrer, the powder bin is communicated with the powder stirrer, the powder stirrer is connected with the feeding end of the mixing stirrer, the discharging bin is communicated with the discharging end of the mixing stirrer, the reservoir is communicated with the mixing stirrer, It is characterized by further comprising an phosphogypsum curing material bin arranged at the upstream end of the aggregate bin, a phosphogypsum curing and air-drying integrated machine communicated with the phosphogypsum curing material bin and arranged at the upstream end of the phosphogypsum curing and air-drying integrated machine, and a phosphogypsum raw material crusher arranged at the upstream end of the phosphogypsum curing and air-drying integrated machine, wherein the phosphogypsum curing body is harmless phosphogypsum formed by fully mixing phosphogypsum and curing agent, The phosphogypsum curing and air drying integrated machine mainly comprises a diluter, an atomizer, a stirring and dispersing tank and a dryer, and is used for harmless phosphogypsum, the dryer is sleeved on the periphery of the stirring and dispersing tank, the diluter is arranged on a frame outside the stirring and dispersing tank, the atomizer is communicated between the diluter and the stirring and dispersing tank, a raw material inlet and a curing body outlet are arranged on the stirring and dispersing tank, the phosphogypsum raw material crusher is communicated with the raw material inlet, the curing body outlet is arranged at the feeding end of a phosphogypsum curing body bin, The phosphogypsum curing and air drying integrated machine is also communicated with an additive dosing machine for filling phosphogypsum curing agent and supplying the phosphogypsum curing agent to the diluter.
2. The phosphogypsum innocent treatment device according to claim 1, wherein the phosphogypsum raw material crusher adopts a hammer crusher for crushing the sticky wet materials.
3. The phosphogypsum innocent treatment device according to claim 1, wherein a propelling stirring blade and a blade drive are arranged in the diluter, the blade drive is arranged at the top of the diluter, and the propelling stirring She Zhouduan is connected to the blade drive and the stirring end extends into the diluter.
4. The phosphogypsum innocent treatment device according to claim 3, wherein the atomizer comprises an ultrasonic atomizer body, an atomizing pipe and an atomizing nozzle, a fluid inlet of the ultrasonic atomizer body is communicated with the diluter, a fluid channel of the ultrasonic atomizer body is connected with the atomizing pipe, the atomizing pipe is provided with more than two groups and uniformly distributed along the length direction of the stirring dispersion tank, and the atomizing nozzle is fixed at the front end of the atomizing pipe and is arranged in the stirring dispersion tank.
5. The phosphogypsum innocent treatment device according to claim 4, wherein a spiral belt type stirring blade is arranged on a stirring shaft in the stirring dispersion tank.
6. The phosphogypsum innocent treatment device according to claim 1, wherein the phosphogypsum curing body bin comprises a funnel-shaped bin body and a rotary vibration arch breaking assembly, the funnel-shaped bin body is divided into an outer shell layer and an inner shell layer, the section of the inner shell layer is in an inverted trapezoid shape, and the rotary vibration arch breaking assembly is arranged at a discharge hole of the inner shell layer and used for controlling vibration arch breaking discharge of the phosphogypsum curing body.
7. The phosphogypsum innocent treatment device according to claim 6, wherein the aggregate bin is provided with at least one group and is arranged in parallel with the funnel-shaped bin body, and the starting end of the conveyor is arranged below the discharge hole of the funnel-shaped bin body and extends along the arrangement direction of the aggregate bin until reaching the feeding end of the mixing stirrer.
8. The phosphogypsum innocent treatment device according to claim 7, wherein the mixing stirrer consists of two groups of stirring cylinders which are stacked up and down, the dosing machine and the reservoir are communicated with the stirring cylinder at the upper layer, the tail end of the conveyor is communicated into the stirring cylinder at the upper layer, and the outlet of the stirring cylinder at the lower layer is communicated with the discharging bin.
9. An phosphogypsum innocent treatment process, which uses the phosphogypsum innocent treatment device according to any one of claims 1-8, and is characterized by comprising the following steps, S1, testing the water content of phosphogypsum raw materials, wherein when the water content is less than 15%, a hammer crusher is selected, the discharge grain diameter is 0.1-2 mm, and when the water content of phosphogypsum raw materials is more than 15%, a hammer crusher for crushing sticky materials is used, and the discharge grain diameter is 0.1-5mm; S2, crushing the phosphogypsum raw material by using a crusher, and conveying the crushed phosphogypsum raw material into a phosphogypsum curing and air drying integrated machine for harmless treatment; S3, adding 5-10 parts of water into each part of curing agent liquid to dilute in an additive dosing machine, supplying the diluted curing agent liquid to a diluter, opening a push type stirring blade to stir during dilution, then opening an atomizer to spray the curing agent into a stirring dispersion tank, atomizing the curing agent with the particle size below 10 microns, atomizing the curing agent at the speed of 40ml/min, atomizing, spraying and stirring to disperse the curing agent simultaneously, opening a dryer to dry phosphogypsum after the phosphogypsum is harmless, and drying at the temperature ranging from 50 ℃ to 300 ℃ to form phosphogypsum cured bodies with the water content below 15%; S4, discharging the phosphogypsum solidified body by the stirring and dispersing tank, inputting the phosphogypsum solidified body into a phosphogypsum solidified body storage bin, S5, simultaneously opening a phosphogypsum solidified body bin and an aggregate bin, loading building aggregate in the aggregate bin, metering the phosphogypsum solidified body and the building aggregate onto a conveyor, conveying the mixed material into a mixing stirrer by the conveyor, S6, simultaneously operating the powder bin and the powder stirrer, stirring and mixing cement and other powder according to the measurement, then feeding the mixture into the mixing stirrer, And S7, mixing all the materials, the additive and the water sequentially and fully mixing the materials by an upper layer stirring cylinder and a lower layer stirring cylinder, obtaining a phosphogypsum-based new material after mixing, and discharging the phosphogypsum-based new material to a discharging bin.
10. The application of the phosphogypsum-based new material obtained by the innocent treatment process according to claim 9 in roadbed construction, which comprises the following application steps: S1, adopting a transport vehicle with a short hopper, loading the harmless phosphogypsum-based new material from a discharging bin by the transport vehicle, S2, covering the materials by using tarpaulin in the transportation process, wherein the time from mixing to transportation to on-site paving is not more than 2 hours when the ambient temperature is higher than 30 ℃, the materials should be treated as waste materials when the ambient temperature is higher than 3 hours, the time from mixing to transportation to on-site paving is not more than 3 hours when the ambient temperature is lower than 30 ℃, the time from mixing to transportation to on-site paving is preferably more than 4 hours when the ambient temperature is lower than 15 ℃, S3, when in discharging, the transport vehicle increases the discharging angle, and a vibrator is additionally arranged to assist in discharging, S4, in the paving process, adopting a two-layer continuous paving construction mode, wherein each layer of construction is provided with independent paving and rolling equipment, the paving ensures enough thickness, the paving thickness of each layer after rolling forming is not less than 160mm, the speed of a paver is controlled to be 1.0-3.0 m/min in the paving process, The transverse joint is kept during paving, the front-back distance of the paver is not longer than 10m during construction, the longitudinal direction of the adjacent construction section surfaces is overlapped by 30 cm-40 cm, When the primary operation width of the stabilizing layer is 11-12 m, the length of each running operation section is 300m, when the primary operation width of the stabilizing layer is more than 12m, the length of the operation section is correspondingly shortened, S5, compacting according to the working procedures of voltage stabilization, strong vibration, weak vibration and voltage stabilization, compacting according to the compacting directions of the outer side and the inner side, loosening and pushing roadbed materials occur in the process of rolling when in hot construction, wetting by spraying water mist, stirring uniformly, adjusting to the water content of delivery, compacting again, S6, in the process of curing, after the phosphogypsum stabilizing layer is rolled and qualified through compactness inspection, covering and curing are carried out within 2 hours, wherein the curing time is 7-14 days.

Description

Phosphogypsum harmless treatment device, phosphogypsum harmless treatment process and phosphogypsum harmless treatment application Technical Field The invention relates to the technical field of phosphogypsum building new material production, in particular to a phosphogypsum harmless treatment device, a phosphogypsum harmless treatment process and application of the phosphogypsum harmless treatment device. Background Phosphogypsum is a byproduct of phosphoric acid production by a phosphorite wet process, and about 5 tons of phosphogypsum can be produced per 1 ton of phosphoric acid produced. At present, the total stockpiling of phosphogypsum in China is more than 7 hundred million tons, and about 8000 ten thousand tons are newly increased each year, but the comprehensive utilization rate is less than 40%, the unutilized phosphogypsum is mainly stockpiled, a large amount of land is occupied, and the residual acid, phosphorus, fluorine, organic matters and other impurities can cause serious pollution to the land and underground water along with rainwater, so that the ecological environment problem exists in 54% phosphogypsum stock. Therefore, how to safely dispose and comprehensively utilize phosphogypsum to form a scale effect is a current problem to be solved urgently. The main comprehensive utilization way of phosphogypsum is to manufacture building materials, including cement retarder, paper gypsum board, gypsum block, gypsum mortar, etc., but the comprehensive utilization rate is lower. In contrast, highway construction scale is stable, construction points are many, line length and line width are wide, and according to incomplete statistics, the highway engineering construction in China consumes more than 10 hundred million tons of materials such as sand, cement and the like each year. However, the growing shortage of traditional raw materials results in natural aggregates that are increasingly expensive and difficult to purchase. Phosphogypsum is used as a road material, so that a large amount of phosphogypsum can be rapidly consumed, and green sustainable development of road infrastructure construction can be promoted, and the phosphogypsum has important practical significance. The invention (application number: 202311277836.1) applied in 9/28 of 2023 relates to an phosphogypsum curing agent, a phosphogypsum curing body and application thereof, wherein the phosphogypsum curing body is mentioned, the mass ratio of the phosphogypsum to the phosphogypsum curing agent is 100:25-40, and the phosphogypsum curing body is applied to a pavement base layer, a river levee slope, a pool bottom or a rolling type earth-rock dam substrate. The existing stirring station only comprises an aggregate bin, a powder tank, a stirring bin, a discharging bin, a stirrer and an additive equipment bin, and because of the particularity of the phosphogypsum curing body, phosphogypsum and a phosphogypsum curing agent are needed to be obtained after being sequentially mixed, when the phosphogypsum is used for preparing new materials, the existing stirring station cannot be used, and the phosphogypsum-based new materials are needed to be adaptively modified according to the physical and chemical properties of phosphogypsum raw materials and the production proportion of the phosphogypsum-based new materials. The invention (publication No. CN 119858239A) applied for 2 and 7 of 2025 discloses an phosphogypsum stirring station, which comprises a powder batching machine, an aggregate batching machine, a curing agent metering device, a conveying device, a stirring host machine and a finished product bin, wherein the powder batching machine and the curing agent metering device are used for putting materials on a first conveying device according to a mixing ratio, so that accurate and stable metering and conveying of each material can be realized, each material enters the stirring host machine for continuous vibration stirring, then the finished product material is transported into the finished product bin through a second conveying device, the segregation of the finished product can be greatly reduced through a segregation preventing mechanism in the process, and each batching mechanism can be stacked according to the position of an actual place and the production efficiency is greatly improved through continuous stirring of the stirring host machine. Although the stirring station is designed for phosphogypsum, the stirring station is not suitable for preparing new phosphogypsum materials in 'a phosphogypsum curing agent, a phosphogypsum curing body and application thereof', for two reasons: The first phosphogypsum contains a great amount of impurities, the main components of the phosphogypsum are SO 3 and CaO, the dry basis weight percentage is 86.86% -93.95%, the phosphogypsum also contains P 2O5、Fe2O3, F and other impurities with different amounts, and the phosphogypsum also contains some organic carbon, unreacted apatite, heavy metals,