Method of producing wet-process phosphoric acid and alpha-hemihydrate phosphogypsum from middle grade phosphorus ore

A technology of hemihydrate phosphogypsum and wet-process phosphoric acid, which is applied in the direction of calcium/strontium/barium sulfate, etc., can solve the problems of high impurity content of gypsum, unsuitability for the production of medium and low-grade phosphate rock, restricting the comprehensive utilization of phosphogypsum, etc. The effect of increased energy consumption

Active Publication Date: 2018-12-18
ANHUI LIUGUO CHEM CO LTD
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AI Technical Summary

Problems solved by technology

The traditional two-water method and one-step semi-hydrate process have low phosphorus yields, only about 94% and 92% respectively, and the high impurity content in gypsum severely restricts the comprehensive utilization of phosphogypsum; the semi-hydrate-dihydrate process has a high phosphorus yield 1. The quality of gypsum is good, but this process has high requirements for phosphate rock raw materials, which is not suitable for most enterprises to adopt. At the same time, what is obtained by this process is dihydrate gypsum, which increases the cost of comprehensive utilization
[0006] The two-step wet phosphoric acid process (semi-water-dihydrate process, dihydrate-semi-water process) is gradually emerging, of which the semi-water-dihydrate process has been industrialized in China, with high acid concentration, high phosphorus yield, The advantage of good energy-saving effect, but the problem is that the by-product is phosphogypsum dihydrate, which cannot be directly used with high added value
However, the dihydrate-semi-water process is currently limited to literature descriptions in China, and the research content is mainly to use high-grade ore powder as raw material, which is not suitable for the production of medium and low-grade phosphate rock.

Method used

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  • Method of producing wet-process phosphoric acid and alpha-hemihydrate phosphogypsum from middle grade phosphorus ore
  • Method of producing wet-process phosphoric acid and alpha-hemihydrate phosphogypsum from middle grade phosphorus ore
  • Method of producing wet-process phosphoric acid and alpha-hemihydrate phosphogypsum from middle grade phosphorus ore

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Embodiment 1

[0035] Step 1, 1# phosphate rock described in table 1 is ground into phosphate rock slurry (30wt.%H 2 O) and 98wt.% concentrated sulfuric acid are added continuously to the decomposition tank with the amount of 7.1t / h, 0.8t / h respectively, add simultaneously the ω (P 2 o 5 ) 32.7wt.% of dilute phosphoric acid and a mixture of primary washing liquid, and the three carry out the decomposition reaction of phosphate rock, wherein the phosphate rock slurry is converted into dry basis, and 98wt.% concentrated sulfuric acid is converted into pure H 2 SO 4 , dilute phosphoric acid converted into P 2 o 5 The mass ratio of the latter three is 1:0.16:1.6, and the process index of the control decomposition tank: temperature 80-85°C; free sulfate ion (SO 4 2- ) concentration of 10-20g / L; the solid content of the slurry is 25wt.%; the reaction time is 2.5-3h to obtain the phosphate ore decomposition mixed slurry.

[0036] Step 2, in step 1, mixed slurry (accounting for 47wt.%) carries...

Embodiment 2

[0046] Step 1, 2# phosphate rock described in table 1 is ground into phosphate rock slurry (30wt.%H 2 O) and 98wt.% concentrated sulfuric acid are added continuously to the decomposer with the amount of 8.6t / h, 2.1t / h respectively, add simultaneously the ω (P 2 o 5 ) 28wt.% of dilute phosphoric acid and a mixture of primary washing liquid, the three carry out the decomposition reaction of phosphate rock, wherein the phosphate rock slurry is converted into dry basis, and 98wt.% concentrated sulfuric acid is converted into H 2 SO 4 , dilute phosphoric acid converted into P 2 o 5 The mass ratio of the latter three is 1:0.32:1.3, and the technical indicators of the decomposition tank are controlled: temperature 80-85°C; free sulfate (SO 4 2- ) concentration of 10-20g / L; the solid content of the slurry is 25wt.%; the reaction time is 2.5-3h to obtain the phosphate ore decomposition mixed slurry.

[0047] Step 2, mixed slurry (accounting for 47wt.%) in step 1 carries out solid...

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Abstract

The invention relates to a method of producing wet-process phosphoric acid and alpha-hemihydrate phosphogypsum from middle grade phosphorus ore and is an energy-saving and low-consumption wet-processphosphoric acid producing method. The method includes: decomposition reaction, solid-liquid separation, hemihydrates conversion reaction, and filtration and washing, wherein the technical parameters in the steps are controlled to finally produce a high-concentration final product of phosphoric acid and high-quality alpha-hemihydrate phosphogypsum; the final product of phosphoric acid is 35-42 wt%in concentration; the alpha-hemihydrate phosphogypsum is 13-15% in omega(H2O), is not more than 0.25% in omega(insoluble P2O5) and is not more than 0.1% in omega(soluble P2O5). Through the classification technology, zero emission of the byproduct, phosphogypsum, is achieved.

Description

technical field [0001] The invention belongs to the technical field of phosphate rock utilization, in particular to a method for producing wet-process phosphoric acid and alpha hemihydrate phosphogypsum from medium-grade phosphate rock Background technique [0002] my country's phosphate rock reserves are abundant but not rich. The proven resource reserves are 17.6 billion tons of ore, and the basic reserves are 3.3 billion tons. However, the reserves of high-grade phosphate rock are low, P 2 o 5 The reserves of rich phosphorous ore with a content greater than 30wt.% are only 1.66 billion tons. As a non-renewable precious resource, phosphate rock has been listed as a strategic mineral in the "National Mineral Resources Planning (2016-2020)". [0003] The industrial by-product phosphogypsum of the wet phosphoric acid process, the main component is calcium sulfate, phosphoric acid is the basic raw material for the production of phosphorus chemical products, and 1 ton of phos...

Claims

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Application Information

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IPC IPC(8): C04B11/26C01F11/46
Inventor 朱英俊沈浩郑之银杨豹嶂雷云刘荣盛子璜孙诚许琦嫚陈晨朱广飞彭克荣沈维婷
Owner ANHUI LIUGUO CHEM CO LTD
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