WO2002020400A1 - Procede de preparation d'acide phosphorique par voie humide - Google Patents

Procede de preparation d'acide phosphorique par voie humide Download PDF

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Publication number
WO2002020400A1
WO2002020400A1 PCT/CN2001/000796 CN0100796W WO0220400A1 WO 2002020400 A1 WO2002020400 A1 WO 2002020400A1 CN 0100796 W CN0100796 W CN 0100796W WO 0220400 A1 WO0220400 A1 WO 0220400A1
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Prior art keywords
reaction
sulfuric acid
tank
concentration
slurry
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PCT/CN2001/000796
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English (en)
French (fr)
Inventor
Yisheng Feng
Jiutian Feng
Xigang Liu
Yurui Wang
Tianbao Lu
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Shandong Lubei Enterprise Group Company
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Priority to AU2001287516A priority Critical patent/AU2001287516A1/en
Priority to US10/362,845 priority patent/US7172742B2/en
Publication of WO2002020400A1 publication Critical patent/WO2002020400A1/zh

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    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01FCOMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F11/00Compounds of calcium, strontium, or barium
    • C01F11/46Sulfates
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B25/00Phosphorus; Compounds thereof
    • C01B25/16Oxyacids of phosphorus; Salts thereof
    • C01B25/18Phosphoric acid
    • C01B25/22Preparation by reacting phosphate-containing material with an acid, e.g. wet process
    • C01B25/222Preparation by reacting phosphate-containing material with an acid, e.g. wet process with sulfuric acid, a mixture of acids mainly consisting of sulfuric acid or a mixture of compounds forming it in situ, e.g. a mixture of sulfur dioxide, water and oxygen
    • C01B25/228Preparation by reacting phosphate-containing material with an acid, e.g. wet process with sulfuric acid, a mixture of acids mainly consisting of sulfuric acid or a mixture of compounds forming it in situ, e.g. a mixture of sulfur dioxide, water and oxygen one form of calcium sulfate being formed and then converted to another form
    • C01B25/231Dihydrate-hemihydrate process

Definitions

  • the invention relates to the field of phosphoric acid production, in particular to an improvement of a wet-process phosphoric acid production process. Background technique
  • Phosphoric acid is an important chemical raw material, and its production method is divided into two categories, wet method and thermal method.
  • the typical method for making phosphoric acid by wet process is to decompose the phosphate rock with sulfuric acid, and the obtained phosphoric acid slurry is separated into liquid and solid to obtain phosphoric acid and calcium sulfate.
  • the production method of wet-process phosphoric acid can be divided into two-water method, half-water method, anhydrous method, half-water one-two-water method and two-water half-water method.
  • the dihydrate method is the main method of phosphoric acid production today. Its output accounts for more than 80% of the total phosphoric acid production, and the scale of the device has become larger.
  • the two-water method has two disadvantages: one is the eutectic phenomenon of CaHP0 4 in the gypsum crystal lattice, the P 2 0 5 loss is serious, and the recovery rate is not high; the other is that the phosphoric acid concentration is not high, only about 30%. At present, most of the phosphoric acid production in China uses the dihydrate method, and only a few use the semi-water method or the semi-water one or two water method. Disclosure of invention
  • the purpose of the present invention is to provide a production process of phosphoric acid, which is a dihydrate and half-water process. This process can use low-grade phosphate rock to produce high-concentration phosphoric acid and obtain high-quality phosphorous with low phosphorus content. Gypsum to suit the needs of the production of sulfuric acid and cement.
  • the solution of the present invention is to input the phosphate rock slurry and sulfuric acid in two steps and directly shunt a part of the reaction slurry to the conversion tank to participate in the conversion of dihydrate gypsum.
  • the invention uses the following production processes:
  • the input amount of phosphate ore slurry and sulfuric acid is 70-90% of the total amount of the feed, and the control reaction temperature is 75-85:, the liquid-solid ratio is 2.3-2.6, and the concentration of S0 3 in the liquid phase is 0.04- 0.07 g / L, the concentration of P 2 0 5 in the reaction liquid phase is 28-30%.
  • the secondary reaction solution enters the second reaction tank 2, and the remaining phosphate ore slurry and sulfuric acid are added to the second reaction tank to complete the reaction.
  • a part of the slurry 8 is diverted to the conversion tank 4, and its partial flow is 10-30% of the total amount of the slurry flowing out after the secondary reaction.
  • the remaining part 7 enters the separator 5 to extract the finished phosphoric acid.
  • the concentration of phosphoric acid product is P 2 0 5 33-39%.
  • the supplemental amount of sulfuric acid is 0-15% of the amount of sulfuric acid put into the first reaction tank.
  • the control temperature is 90-105 ° C
  • the liquid-solid ratio is 2.5-3
  • the concentration of liquid phase S0 3 is 0.07-0.09g / L.
  • the concentration of P 2 0 5 in the liquid phase is about 24-30%. .
  • the transformation liquid enters the filter 6 for filtration and separation, and the filtrate 9 (P 2 0 5 concentration is 24-30%) is returned to the first reaction tank.
  • the filter cake is the hemihydrate gypsum raw material, and the crystal water content is 4-83 ⁇ 4,
  • the adsorbed water is about 18-20%. After natural hydration into dihydrate gypsum, the adsorbed water is only 5-10%. It can be used as raw materials for the production of sulfuric acid and cement, and can also be used as gypsum board and other building materials.
  • An important feature of the present invention is that phosphorus ore pulp and sulfuric acid are divided into two reaction tanks for decomposition reaction, and 70-90% of the phosphate ore pulp and sulfuric acid are input in the first reaction tank, which can control a lower P 205 and the concentration of free sulfuric acid concentration as high as possible, in order to obtain good crystallization conditions to reduce the loss P eutectic 205; a second reaction vessel additional portion of phosphate rock and sulfuric acid slurry can be controlled with a groove High F 2 0 5 concentration (up to 30-35%), and maintained good gypsum crystal growth conditions, gypsum crystals are coarse and uniform, and have good filtration performance.
  • Another important feature of the present invention is that a part of the material liquid flowing out after the completion of the reaction in the second reaction tank is directly shunted into the conversion tank to participate in the conversion reaction of the dihydrate stone paste separated by the centrifuge.
  • an appropriate amount of sulfuric acid can also be added according to the actual situation, so that the liquid phase of the conversion tank has a higher concentration of sulfuric acid and phosphoric acid, thereby forming conditions for stable conversion of dihydrate gypsum to hemihydrate gypsum, which not only promotes the conversion process And hemihydrate gypsum crystals grow up, and can prevent "over-dehydration" of hemihydrate gypsum.
  • a filtration assisting step may be added between the conversion tank 4 and the filter 6, that is, a filter assisting tank 5 is added in between, so that the conversion solution from the conversion tank enters the filter assisting tank. 5.
  • the porous coke particles can adsorb the fluorosilicic acid and other components present in the slurry, increase the porosity of the filter material, thereby increasing the filtration speed of the hemihydrate gypsum and increasing the production capacity of the filter by 10-30%.
  • FIG. 1 is a schematic diagram of a production process of phosphoric acid according to the present invention.
  • the phosphate ore pulp, sulfuric acid and the light phosphoric acid 9 returned from the filter 6 enter the first reaction tank 1 for decomposition reaction, and the reaction time is about 1.5-2 hours.
  • the added amounts of the phosphate ore pulp and sulfuric acid are respectively It accounts for about 80% of its total input.
  • the primary reaction solution enters the second reaction tank, and part of the phosphate slurry and sulfuric acid are added to the second reaction tank to complete the reaction.
  • the reaction time is about 1.5-2 hours. It accounts for about 20% of its total input.
  • P 2 0 5 to give a concentration of 33--39% of the finished phosphoric acid.
  • the dihydrate gypsum 10 separated from the separator 3 enters the conversion tank 4 and is mixed with the divided slurry 8 after the secondary reaction, and an appropriate amount of sulfuric acid may be added to perform the conversion reaction according to the actual situation.
  • Hydrogypsum is converted into hemihydrate gypsum here, and the reaction time is about 40-60 minutes.
  • the transformation liquid filter 6 is filtered, and the filtrate contains 24-30% P 2 0 5 alimentic acid returned to the first reaction tank.
  • the filter cake is hemihydrate gypsum, which contains 4-8% crystal water and 18-20 adsorbed water. %, Containing P 2 0 5 0.05-0.2%, as raw materials for the production of sulfuric acid and cement, can also be used as gypsum board and other building materials. The best way to implement the invention
  • the input amount of phosphate ore slurry and sulfuric acid was 71% and 72% of the total amount of the feed, the reaction temperature was controlled at 79 ° C, the liquid-solid ratio was 2.55, and the concentration of S0 3 in the liquid phase was 0.064g / L, reaction time was 1.8 hours.
  • the concentration of P 2 0 5 in the reaction liquid phase was 28.9%.
  • the primary reaction solution enters the second reaction tank, and the remaining 29% phosphate rock and 28% sulfuric acid are added to the second reaction tank to complete the reaction.
  • the reaction temperature was controlled at 74 ° C.
  • the liquid-solid ratio was 2.59
  • the concentration of SO 3 in the liquid phase was 0.038 g / L
  • the reaction time was 1.6 hours.
  • the concentration of P 2 0 5 in the reaction liquid phase was 33.1%.
  • the added amount of sparse acid is 11% of the amount of sulfuric acid introduced into the second reaction tank.
  • the temperature in the conversion tank is controlled at 96 ° C, the liquid-solid ratio is 2.77, the concentration of liquid phase S0 3 is 0.079g / L, and the reaction time is 54. min at which time the liquid phase F 2 0 5 concentration of approximately 27.4%.
  • the conversion solution enters the filter aid tank, and coke powder is added so that the ratio of the added amount to the gypsum is 1:21, after mixing into the filter separated by filtration, the filtrate (P 2 0 5 concentration of 27.1%) returns to the first reaction vessel and the filter cake is the hemihydrate gypsum raw material, the crystal water content of 6.78%, the adsorption
  • the water is about 19.16%
  • the P 2 0 5 content in the hemihydrate gypsum is 0.13%
  • the P 2 0 5 recovery rate is 99.1%.
  • After natural hydration into dihydrate gypsum, its absorbed water is only 6.81%, which can be used as raw materials for the production of sulfuric acid and cement, and can also be used as gypsum and other building materials.
  • the primary reaction solution enters the second reaction tank, and the remaining 22% of phosphate rock pulp and 20% of sparse acid are added in the second reaction tank to complete the reaction.
  • the reaction temperature was controlled at 78 ° C
  • the liquid-to-solid ratio was 2.57
  • the concentration of S0 3 in the liquid phase was 0.031 g / L
  • the reaction time was 1.6 hours.
  • the concentration of P 2 0 5 in the reaction liquid phase was 34.3%.
  • the filtrate (P 2 0 5 concentration of 27.9%) returns to the first reaction vessel and the filter cake is the hemihydrate gypsum raw material, the water content of the crystal 7.133 ⁇ 4, adsorption
  • the water is about 18.94%
  • the P 2 0 5 content in the hemihydrate gypsum is 0.08%
  • the P 2 0 5 recovery rate is 99.43 ⁇ 4.
  • After natural hydration into dihydrate gypsum, its adsorption water is only 6.58%. It can be used as raw material for the production of sulfuric acid and cement. Can be used as gypsum and other building materials.
  • two reaction tanks are used to separately input phosphate ore slurry and sulfuric acid, and a part of the reacted feed liquid is directly diverted to a conversion tank to participate in the conversion of dihydrate gypsum.
  • This process improves the yield of P 2 0 5 and its recovery rate can reach more than 99%, and can obtain high-quality hemihydrate gypsum with a P 2 0 5 content of 0.05-0.2% and a crystal water content of 4- 8%, adsorbed water content of about 19%.
  • hemihydrate gypsum After hemihydrate gypsum is naturally hydrated, it can be used to produce sulfuric acid and cement without drying.
  • Adding coke powder to the filter material as a filter aid increases the production capacity of the filter, reduces energy consumption, and has obvious economic and social benefits.

Description

一种磷酸生产工艺 技术领域
本发明涉及磷酸生产领域, 具体的说是一种湿法磷酸生产工艺的 改进。 背景技术
磷酸是一种重要的化工原料, 其生产方法分湿法和热法两大类。 典型的湿法制磷酸是用硫酸分解磷矿, 所得的磷酸料浆经液固分离后 获得磷酸和硫酸钙。 根据条件不同, 依据其生成硫酸钙所含结晶水的 多少, 湿法磷酸的生产方法又可分二水法、 半水法、 无水法、 半水一 二水法和二水一半水法。 其中无水法至今没有实现工业化, 半水法因 操作要求高, 故选用较少。 二水法是当今磷酸生产的主要方法, 其产 量占磷酸总产量的 80%以上, 且裝置规模已趋大型化。 二水法存在两 个缺点: 其一是石膏晶格中存在 CaHP04的共晶现象, P205损失严重, 回收率不高; 其二是磷酸浓度不高, 仅为 30%左右。 我国目前磷酸生 产大部分采用二水法, 只有少数使用半水法或半水一二水法, 尚未见 有使用二水一半水法。 发明的公开
本发明的目的在于提供一种磷酸的生产工艺, 其为二水一半水法 工艺, 该工艺可利用较低品位的磷矿制取高浓度磷酸, 并可获得含磷 量较低的高质量磷石膏, 以适合生产硫酸和水泥的需要。
本发明的解决方案是分两步投入磷矿浆与硫酸 并将反应料浆一 部分直接分流到转化槽中参与二水石膏的转化。 本发明采用了以下生 产工艺:
1 .将磷矿浆、 硫酸和从过滤机 6 返回的淡磷酸 9, 按比例投入第 一反应槽 1 中进行分解分应。 其投料比 (重量比) 为: 磷矿浆: 硫酸: 返回碑酸 =1 : (0.6-0.8) : ( 1 .0-2.5)。磷矿与硫酸的摩尔比为 1: 5。 在第一反应槽中磷矿浆、 硫酸的投入量为其投料总量的 70- 90%, 控制 反应 温度 75-85 : , 液 固 比为 2.3-2.6, 液相 中 S03 浓度为 0.04- 0.07g/L, 反应液相中 P205生成浓度为 28-30%。
2 .—次反应液进入第二反应槽 2 , 并在第二反应槽中补加剩余磷 矿浆与硫酸, 使之反应完全。在第二反应槽中控制反应温度 70 - 80 °C、 液固比为 2.3-2.7, 液相中 303浓度 0.03- 0.05g/L, 反应液相中 P205 生成浓度为 30-35%
3 .二次反应后的料浆, 一部分料浆 8被分流到转化槽 4 , 其分流 量为二次反应后流出料浆总量的 10-30%, 其余部分 7进入分离器 5提 取成品磷酸, 磷酸产品浓度为 P205 33-39%。
4.由分离器分离出的二水磷石膏 10 和从第二反应槽流出二次反 应料浆的分流部分料浆 8, 进入转化槽 4, 并可补加部分硫酸, 通入蒸 汽, 进行转化反应 。 硫酸的补加量为投入第一反应槽中硫酸量的 0-15%。 在转化槽中控制温度为 90-105 °C, 液固比为 2.5-3, 液相 S03 浓度为 0.07-0.09g/L, 此时液相中 P205浓度为 24- 30%左右。
5.转化液进入过滤机 6过滤分离, 滤液 9 (P205浓度为 24-30%) 返回第一反应槽, 滤饼即为半水石膏生料, 其结晶水含量为 4-8¾、 吸 附水为 18-20%左右, 自然水化为二水石膏后, 其吸附水仅为 5-10% , 可作为生产硫酸和水泥的原料, 也可做石膏板及其它建筑材料。
本发明的一个重要特征在于在两个反应槽中分两次投入磷矿浆和 硫酸进行分解反应, 在第一反应槽中投入 70 - 90%的磷矿浆与硫酸, 可 以控制较低的 P205浓度和尽可能高的游离硫酸浓度, 以便获得良好的 结晶条件, 減少 P205的共晶损失; 在第二反应槽中补加部分磷矿浆和 硫酸, 可以控制槽内有较高的 F205浓度 (达到 30- 35%) , 并保持了良 好的石膏结晶成长条件, 石膏结晶粗大、均匀, 具有良好的过滤性能。 由此減少了 P205的共晶损失和水溶性 F205的损失,未分解的 P205降低, 提高了 P205的收率, 因此可以使用中品位磷矿来生产高浓度磷酸。
本发明的另一个重要特点是从第二反应槽反应完成后流出的料 液, 一部分被直接分流进入转化槽, 参与由离心机分离出的二水合石 膏的转化反应。 在这一步骤中也可根据实际情况补加适量的硫酸, 使 得转化槽的液相有较高浓度的硫酸和磷酸, 从而形成了稳定二水石膏 向半水石膏转化的条件, 既促进转化过程和半水石膏结晶的长大, 并 且可以防止半水石膏的 "过度脱水" 。
. 在本发明的磷酸生产工艺过程中, 与转化槽 4和过滤机 6之间, 可增加一个助滤步骤, 即在其间增加一个助滤槽 5, 使来自转化槽的 转化液进入助滤槽 5, 于助滤槽中加入焦炭粉, 其加入量与石膏的比 例为 1 : 16 - 30, 混合均匀后送入过滤机 6进行随后的过滤操作。 该多 孔性的焦炭颗粒可以吸附料浆中存在的氟硅酸等組分, 使滤料的孔隙 度增加, 从而提高了半水石膏的过滤速度, 使过滤机的生产能力提高 10-30%。 附图的筒要说明
图 1是本发明磷酸生产工艺流程示意图 。
在图 1 中, 磷矿浆、 硫酸和从过滤机 6返回的淡磷酸 9一起进入 第一反应槽 1进行分解反应, 反应时间约 1 .5-2小时, 磷矿浆与硫酸 的加入量分别占其投料总量的 '80%左右。 一次反应液进入第二反应槽 之中, 并在第二反应槽中补加部分磷矿浆与硫酸使其反应完全, 反应 时间约 1 .5 - 2 小时, 嶙矿浆与硫酸的补加量分别占其投料总量的 20% 左右。 二次反应完全后的料浆, 分流一部分料浆 8 到转化槽 4, 其余 部分料浆 7进入分离器 3 , 得到 P205浓度为 33 - 39%的成品磷酸。 从分 离器 3中分离出的二水石膏 10进入转化槽 4, 与分流的二次反应后的 料浆 8混合, 并可根据实际情况补加适量硫酸进行转化反应, 此时二 水石膏在这里转化成半水石膏, 反应时间约 40-60分钟。 将转化液过 滤机 6过滤, 滤液中含有 24- 30% P205的淡嶙酸返回第一反应槽, 滤饼 为半水石膏, 其中含结晶水 4-8%、 吸附水 18-20%, 含有 P205 为 0.05-0.2%, 作为生产硫酸和水泥的原料, 也可作石膏板及其它建筑材 料。 实现本发明的最佳方式
实施例 1
1、 将磷矿浆、 硫酸和从过滤机返回的 27.1%的 P205的淡磷酸, 按 比例投入第一反应槽中进行分解反应。 其投料比 (重量比) 为 : 璘 矿浆:硫酸:返回磷酸 = 1:0:75:1.6, 磷矿浆与硫酸的摩尔比为 1:5。 在第一反应槽中磷矿浆、 硫酸的投入量分别为其投料总量的 71%、 72% , 控制反应温度 79 °C , 液固比为 2.55, 液相中 S03 浓度为 0.064g/L, 反应时间 1.8小时。 反应液相中 P205生成浓度为 28.9%。
2、 一次反应液进入第二反应槽, 并在第二反应槽中补加剩余的 29%的磷矿桨与 28%的硫酸, 使之反应完全。 在第二反应槽中控制反 应温度 74°C, 液固比为 2.59, 液相中 S03浓度为 0.038g/L, 反应时间 1.6小时。 反应液相中 P205生成浓度为 33.1%。
3、 二次反应后的料浆, 一部分料浆被分流到转化槽, 其分流量为 二次反应后流出料浆总量的 28%, 其余部分进入分离器提取成品磷 酸, 磷酸产品浓度为 P205 37.14%。
4、使由分离器分离出的二水磷石膏和从第二反应槽流出二次反应 料浆的分流部分料浆进入转化槽, 并补加部分硫酸, 通入蒸汽进行转 化反应。 疏酸的补加量为投入第二反应槽中硫酸量的 11%, 在转化槽 中控制温度为 96°C, 液固比为 2.77, 液相 S03浓度为 0.079g/L, 反应 时间 54分钟, 此时液相中 F205浓度为 27.4 %左右。
5、转化液进入助滤槽, 加入焦碳粉, 使其加入量与石膏的比例为 1:21, 混匀后送入过滤机过滤分离, 滤液 (P205浓度为 27.1%) 返回 第一反应槽, 滤饼即为半水石膏生料, 其结晶水含量为 6.78%、 吸附 水为 19.16%左右,半水石膏中 P205含量为 0.13%,P205回收率为 99.1%。 自然水化为二水石膏后, 其吸附水仅为 6.81%, 可作为生产硫酸和水 泥的原料, 也可用作石膏及其它建筑材料。
实施例 2
1、 将磷矿浆、 硫酸和从过滤机返回的 27.9%的 P205的淡磷酸, 按 比例投入第一反应槽中进行分解反应。 其投料比 (重量比) 为: 磷矿 浆: L酸:返回磷酸二 1:0.68:1.4, 磷矿浆与硫酸的摩尔比为 1:5。 在 第一反应槽中磷矿浆、 硫酸的投入量为其投料总量的 78%、 80%, 控 制反应温度 83°C, 液固比为 2.41, 液相中 S03浓度为 0.053g/L, 反应 时间 2小时。 反应液相中 P205生成浓度为 29.1%。
2、 一次反应液进入第二反应槽, 并在第二反应槽中补加剩余的 22%的磷矿浆与 20%的疏酸, 使之反应完全。 在第二反应槽中控制反 应温度 78°C, 液固比为 2.57, 液相中 S03浓度为 0.031g/L, 反应时间 1.6小时。 反应液相中 P205生成浓度为 34.3%。
3、 二次反应后的料浆, 一部分被分流到转化槽, 其分流量为二次 反应后流出料浆总量的 23%, 其余部分进入分离器提取成品磷酸, 磷 酸产品浓度为 P205 38.03%。
4、由分离器分离出的二水磷石膏和从第二反应槽流出二次反应料 浆的分流部分料浆, 进入转化槽, 通入蒸汽进行转化反应。 在转化槽 中控制温度为 94 °C , 液固比为 2.91, 液相 S03浓度为 0.067g/L, 反应 时间 1 小时, 此时液相中 P205浓度为 28.3 %左右。
5、 转化液混匀后送入过滤机过滤分离, 滤液 (P205浓度为 27.9%) 返 回第一反应槽, 滤饼即为半水石膏生料, 其结晶水含量为 7.13¾、 吸附水为 18.94%左右, 半水石膏中 P205含量为 0.08%, P205回收率为 99.4¾。 自然水 化为二水石膏后, 其吸附水仅为 6.58%, 可作为生产硫酸和水泥的原料, 也 可用作石膏及其它建筑材料。 工业应用性
本发明采用两个反应槽分二次投入磷矿浆和硫酸, 并将反应后的 料液一部分直接分流到转化槽中参与二水石膏的转化。 这种工艺提高 了 P205的收率, 其回收率可达 99%以上, 并可获得高质量的半水石膏, 其 P205含量为 0.05-0.2%, 结晶水含量为 4-8% , 吸附水含量 19%左右。 半水石膏自然水化后, 无需烘干即可用于生产硫酸和水泥。 滤料中加 入焦炭粉作为助滤剂, 提高了过滤机的生产能力, 降低了能耗, 具有 明显的经济效益与社会效益。

Claims

杈利要求
1 .一种磷酸生产工艺,该生产工艺包括磷矿石分解、分解液分离、 二水磷石膏转化和过滤过程,
其特征在于, 该生产工艺包括以下步骤:
1-1 .嶙矿浆、硫酸和从过滤机返回的淡磷酸 (9) 按比例投入第一 反应槽 (1 ) 进行分解反应, 得到一次反应液;
1 - 2.—次反应液送入第二反应槽 (2) , 并在第二反应槽中补加剩 余的磷矿浆与硫酸, 使之反应完全;
1-3.二次反应后料浆的一部分料浆 (8) 分流到转化槽 (4) , 分 流量为二次反应流出料浆总量的 10-30 , 其余部分 (7) 进入分离器 (3) 提取磷酸;
1 - 4.由分离器分离出的二水嶙石膏 (10) 、 补加的疏酸与从第二 反应槽分流出来的部分反应料浆 (8) —起进入转化槽 (4) 进行转化, 得到转化液;
1-5.转化液进入过滤机 (6) 过滤分离, 滤液 (9) 返回第一反应 槽, 滤饼为半水石膏生料作为制硫酸和水泥的原料使用 。
2.根据杈利要求 1所述的生产工艺,
其特征在于, 在所述步骤 1-4和 1-5之间进一步包括一个助滤步骤, 该助滤步骤为将由步骤 1-4转化液加入助滤槽 (5) , 在助滤槽 (5) 中加入焦炭粉混合。
3.根据杈利要求 1或 2所述的生产工艺,
其特征在于, 在所述步骤 1-1 中硫酸和磷矿浆的投入量为投料总量的 70-90%。
4.根据杈利要求 1或 2所述的生产工艺,
其特征在于, 在所述步骤 1-4中硫酸的加入量为步骤 1 - 1 中硫酸投料 量的 0-15%。
5 .根据杈利要求 1或 2所述的生产工艺,
其特征在于, 在所述步骤 1 - 1 中, 控制反应温度 75-85 °C, 反应液中 生成的 P205浓度为 28-30%, 液相 S03浓度为 0.04-0.07g/L。
6.根据杈利要求 1或 2所述的生产工艺,
其特征在于, 在所述步驟 1 - 2 中, 控制反应温度 70-80 °C, 反应液中 生成的 P205浓度为 30-35%, 液相 S03浓度为 0.03- 0.05g/L
7.根据杈利要求 1或 2所述的生产工艺,
其特征在于, 在所述步骤 卜 4 中, 控制反应温度 90-105 °C, 液相 SOs 浓度为 0.07— 0.09g/L。
8.根据杈利要求 1或 2所述的生产工艺,
其特征在于, 在所述步骤 1-5 中返回第一反应槽的滤液中 F205浓度为 24-30%。
PCT/CN2001/000796 2000-09-01 2001-05-15 Procede de preparation d'acide phosphorique par voie humide WO2002020400A1 (fr)

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