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Method for producing wet-process phosphoric acid by utilizing high-grade phosphate rock

A wet-process phosphoric acid, high-grade technology, applied in the field of phosphorus chemical industry, can solve the problems of low reaction activity, high viscosity of reaction slurry, no industrialization, etc., to improve the reaction rate and conversion rate of acidolysis, improve the reaction rate and conversion rate, The effect of complete acid hydrolysis reaction

Active Publication Date: 2018-05-18
SICHUAN HONGDA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Chinese patent application CN102001636B discloses a method for producing wide-concentration phosphoric acid and clean gypsum by using a medium and low-grade phosphate rock wet method. In the process of phosphoric acid decomposition of phosphate rock in this method, the acidolysis reaction temperature is less than 105°C, resulting in decomposition of phosphate rock The reaction is incomplete. At the same time, due to the low reactivity of medium and low-grade phosphate rock, the decomposition of phosphate rock in the phosphoric acid system is not complete. The unreacted phosphate rock still needs to be decomposed again with sulfuric acid. The content of impurities in the ore is high, the viscosity of the reaction slurry is extremely high, and the solid phase precipitated in the feed liquid blocks the filter equipment. The separation of the unreacted phosphate rock and the liquid phase is an industrial technical problem, and there is basically no possibility of industrialization.
At the same time, the above method has the problem of difficulty in separating the phosphate rock reaction residue and gypsum, and the produced gypsum has a high impurity content.

Method used

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  • Method for producing wet-process phosphoric acid by utilizing high-grade phosphate rock
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  • Method for producing wet-process phosphoric acid by utilizing high-grade phosphate rock

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Embodiment 1

[0027] The technological process of this embodiment is as attached figure 2 shown. P of a phosphate rock 2 o 5 The grade is 31wt%, the MgO content in the phosphate rock is 0.5wt%, and the Al in the phosphate rock 2 o 3 +Fe 2 o 3 The sum of the contents is 1wt%. The phosphate rock is ground into pulp, and the water in the pulp is centrifugally separated to 16wt% by a decanter centrifuge. P 2 o 5 The 95°C phosphoric acid with a content of 37wt% and the phosphate rock slurry with a moisture content of 16wt% are subjected to acidolysis reaction in the pressurized reaction tank R1, and 1000 parts of dry base phosphate rock are added. The operating conditions of the acidolysis reaction are: the temperature is 117°C, The reaction pressure is 0.3 MPa, and the reaction time is 2 hours. The reacted acidolysis slurry enters the separator F1 for solid-liquid separation, and the obtained solid slag is washed in the scrubber R2 to obtain 1000 parts of phosphorus-containing washing...

Embodiment 2

[0029] The technological process of this embodiment is as attached figure 2 shown. P of a phosphate rock 2 o 5 The grade is 36wt%, the MgO content in the phosphate rock is 0.4wt%, and the Al in the phosphate rock 2 o 3 and Fe 2 o 3 The total content of the phosphate rock is 0.9wt%. The phosphate rock is ground into a slurry, and the water content of the slurry is centrifugally separated to 12% by a decanter centrifuge. P 2 o 5 37wt% phosphoric acid at 90°C and phosphate rock slurry containing 16wt% water are subjected to acidolysis reaction in pressurized reaction tank R1, and 1000 parts of dry base phosphate rock are added. The operating conditions of acidolysis reaction are: the temperature is 105°C, and the reaction The pressure is 0.2 MPa, and the reaction time is 3 hours. The reacted acidolysis slurry enters the separator F1 for solid-liquid separation, and the obtained slag is washed in the scrubber R2 to obtain 1000 parts of phosphorus-containing washing water...

Embodiment 3

[0031] The technological process of this embodiment is as attached figure 2 shown. P of a phosphate rock2 o 5 The grade is 33%, the MgO content in the phosphate rock is 0.6wt%, and the Al in the phosphate rock 2 o 3 +Fe 2 o 3 The sum of the contents is 1wt%. The phosphate rock is ground into pulp, and the water in the pulp is centrifugally separated to 2wt% by a decanter centrifuge. P 2 o 5 37wt% phosphoric acid at 95°C and phosphate rock slurry containing 2wt% water are subjected to acidolysis reaction in pressurized reaction tank R1, and 1000 parts of dry base phosphate rock are added. The operating conditions of acidolysis reaction are: the temperature is 140°C, and the reaction The pressure is 0.3MPa, and the reaction time is 5 hours. The reacted acidolysis slurry enters the separator F1 for solid-liquid separation, and the obtained slag is washed in the scrubber R2 to obtain 1000 parts of phosphorus-containing washing water, wherein P 2 o 5 The content is 100 p...

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Abstract

The invention discloses a method for producing wet-process phosphoric acid from high-grade phosphate ore and belongs to the field of processing in phoschemical industry. The method is used for producing high-concentration phosphoric acid and industrial-grade gypsum from the high-grade phosphate ore by adopting a two-step reaction and a countercurrent washing process. The method comprises steps as follows: a step of pressurized acidolysis reaction, a process of acidolysis product separation, a process of calcification reaction of a clear liquid and a process of recycling of a washing liquid. With the adoption of the method, high-concentration phosphoric acid can be produced from phosphorus in the high-grade phosphate ore, meanwhile, the industrial-grade gypsum can also be produced from calcium in the phosphate ore, and energy conservation and valued utilization of calcium are realized.

Description

technical field [0001] The invention relates to the technical field of phosphorus chemical industry, in particular to a method for producing wet-process phosphoric acid by using high-grade phosphate rock. Background technique [0002] The wet-process phosphoric acid process is the process of decomposing phosphate rock with inorganic acid (mainly sulfuric acid) to produce phosphoric acid, that is, reacting sulfuric acid with phosphate rock to form calcium sulfate crystals and phosphoric acid solution, and then separating liquid and solid to obtain phosphoric acid. Among them, the inorganic acid can also be nitric acid and hydrochloric acid. There are some insurmountable defects in the wet process phosphoric acid process. Due to the extensive processing technology, most of the harmful impurities in the ore enter the phosphoric acid. Especially fluorine, once it enters the liquid phase, it will be difficult to separate out. What's more serious is that a large amount of phosph...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/222C01F11/46
CPCC01B25/222C01F11/46
Inventor 刘义明黄建军杨守明张勇边正福马思全
Owner SICHUAN HONGDA
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