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Method for producing dihydrate wet-process phosphoric acid

A production method, the technology of the dihydrate wet method, which is applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of high ore consumption, low phosphorus yield, poor technical and economic indicators, etc., and achieve safe and stable operation of the device. , good economic benefits, the effect of increasing production

Inactive Publication Date: 2012-03-28
云南云天化国际化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002]130ktP2O5 / a dihydrate double tank single paddle dihydrate wet process phosphoric acid plant in 2000 Completed and put into operation in May, the original design capacity was 60ktP2O5 / a. After the device was put into operation, the production was stable, but the technical and economic indicators were poor, and the content of citrate-soluble phosphorus in phosphogypsum As high as 0.55%, resulting in a physical phosphorus yield of only 93.94%
Due to the low yield of phosphorus, the physical ore consumption of phosphate rock is as high as 3.548t / tP2O5, according to 30% P2O5 standard ore, and with the depletion of phosphate rock resources, the purchase price of phosphate rock has increased year by year, resulting in an increase in the production cost of phosphoric acid year by year

Method used

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  • Method for producing dihydrate wet-process phosphoric acid
  • Method for producing dihydrate wet-process phosphoric acid

Examples

Experimental program
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Effect test

Embodiment 1

[0037] Such as figure 1 As shown, the phosphate rock slurry sent by the slurry delivery pump is added to 1 # ,2 # In the extraction tank, the amount of sulfuric acid and the amount of phosphoric acid added to the extraction tank are respectively controlled according to the amount of pulp to fully decompose the phosphate rock to obtain a higher decomposition rate of the phosphate rock. The slurry in the extraction tank flows into the crystal growth tank in the form of overflow, and the unreacted phosphate ore in the crystal growth tank is further decomposed to form coarse, uniform and stable dihydrate phosphogypsum crystals, and better filtration and Washing performance, the fully reacted slurry is sent to the rotary filter by the slurry pump for filtration.

[0038] In order to maintain the temperature of the extraction tank at about 80-83°C and reduce the escape of fluorine-containing gas from the extraction tank, the reaction system adopts an air cooling process, and under...

Embodiment 2

[0043] A kind of production method of dihydrate wet process phosphoric acid, its steps are:

[0044] a. Adding 50% ore pulp and 50% sulfuric acid to two extraction tanks respectively, each extraction tank has at least 4 surface coolers, and controls the reaction temperature at 81.5°C with a blower and surface cooling;

[0045] b. The slurry in the extraction tank flows into the crystal growth tank in the form of overflow, and generates coarse, uniform and stable dihydrate phosphogypsum crystals in the crystal growth tank. The crystal growth tank is connected to the extraction tank through a gas phase tube to control the temperature at 80;

[0046] c. The dihydrate phosphogypsum crystals in the crystal growth tank flow into the rotary filter to filter to obtain finished phosphoric acid, and the filtrate flows into the pulping tank to the re-sizing tank or into the filtration and condensation system;

[0047] d. The tail gas of the cooling extraction tank and the crystal growth...

Embodiment 3

[0049] A kind of production method of dihydrate wet process phosphoric acid, its steps are:

[0050] a. adding 50% ore pulp and 50% sulfuric acid into two extraction tanks respectively, each extraction tank has at least 4 surface coolers, and controls the reaction temperature at 80°C with a blower and surface cooling;

[0051] b. The slurry in the extraction tank flows into the crystal growth tank in the form of overflow, and generates coarse, uniform and stable dihydrate phosphogypsum crystals in the crystal growth tank. The crystal growth tank is connected to the extraction tank through a gas phase tube to control the temperature at 82;

[0052] c. The dihydrate phosphogypsum crystals in the crystal growth tank flow into the rotary filter to filter to obtain finished phosphoric acid, and the filtrate flows into the pulping tank to the re-sizing tank or into the filtration and condensation system;

[0053] d. The tail gas of the cooling extraction tank and the crystal growth...

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Abstract

The invention provides a method for producing dihydrate wet-process phosphoric acid, and relates to a method for producing wet-process phosphoric acid, in particular to a method for producing the dihydrate wet-process phosphoric acid by adopting single-tank single-central agitator and grain growing tank extraction. The method comprises the following steps of: a, adding 50 weight percent of ore pulp and 50 weight percent of sulfuric acid into two extraction tanks respectively, and controlling the reaction temperature to be between 80 DEG C and 83 DEG C by using a blower through surface cooling; b, leading the pulp in the extraction tanks to flow into the grain growing tank in an overflow mode, and generating thick, uniform and stable dihydrate phosphogypsum crystals in the grain growing tank; c, leading the dihydrate phosphogypsum crystal in the grain growing tank to flow into a turntable filter for filtering to generate a finished product of phosphoric acid, and leading the filtrate to flow into a pulping tank and then to a repulping tank or flow into a filter condensation system; and d, cooling tail gas of the extraction tanks and the grain growing tank, and emptying the tail gas after the tail gas is drafted, cooled and cleaned. According to the method, a dihydrate dual-tank single-central agitator process for the dihydrate wet-process phosphoric acid is transformed into a single-tank single-central agitator and grain growing tank process, and an optimized single-tank single-central agitator phosphoric acid device and process are provided to comprehensively increase the yield of P2O5.

Description

technical field [0001] The invention relates to a production method of wet-process phosphoric acid, in particular to a production method of dihydrate wet-process phosphoric acid using single tank, single paddle and crystal growth tank for extraction. Background technique [0002] 130ktP 2 o 5 / a Dihydrate double tank single paddle dihydrate wet process phosphoric acid plant was completed and put into operation in May 2000, the original design capacity was 60ktP 2 o 5 / a, the production is stable after the device is put into operation, but the technical and economic indicators are poor. The content of citrate-soluble phosphorus in phosphogypsum is as high as 0.55%, resulting in a physical phosphorus yield of only 93.94%. Due to the low yield of phosphorus, the physical ore consumption of phosphate rock is as high as 3.548t / tP 2 o 5 ,according to 30% P 2 o 5 Standard ore, and with the depletion of phosphate rock resources, the purchase price of phosphate rock has increa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/222
Inventor 薛毅沈立莹朱明芳钟欧
Owner 云南云天化国际化工有限公司