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Method for producing white gypsum being by-product of wet process phosphoric acid

A technology of wet-process phosphoric acid and white gypsum, which is applied in phosphoric acid, phosphorus oxyacids, calcium/strontium/barium sulfate, etc., can solve problems such as consumption and large sulfur resources, reduce environmental pollution, reduce production costs, and improve value-added effect

Inactive Publication Date: 2015-04-29
HUBEI XIANGYUN GROUP CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The traditional sulfuric acid method produces a large amount of phosphogypsum as a by-product of wet-process phosphoric acid, which not only consumes a large amount of sulfur resources, but also produces about five tons of phosphogypsum residue for every ton of wet-process phosphoric acid produced.

Method used

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  • Method for producing white gypsum being by-product of wet process phosphoric acid
  • Method for producing white gypsum being by-product of wet process phosphoric acid
  • Method for producing white gypsum being by-product of wet process phosphoric acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Take P 2 o 5 Add 400g of 20wt% wet-process phosphoric acid and 200g of dry mineral powder into a 1000ml beaker at the same time, and stir at 350r / min for 2h at 80°C. Stop stirring and let stand for 10 minutes, filter the gypsum slag, dry and weigh the gypsum slag. Add 37g of 98wt% concentrated sulfuric acid to the filtered clear liquid, stir for 10 minutes, let stand for 40 minutes, filter the white phosphogypsum, dry and weigh the white phosphogypsum. The filtrate phosphoric acid was weighed for detection. The parameters of wet-process phosphoric acid and mineral powder are shown in Table 1, and the result data are shown in Table 2 and Table 3:

[0019] Table 1

[0020] Table 2

[0021]

[0022] table 3

[0023]

[0024] It can be seen from the above data that: wet-process phosphoric acid and mineral powder are fed at a ratio of 2:1, the average conv...

Embodiment 2

[0026] Take P 2 o 5 Add 600g of 20wt% wet-process phosphoric acid and 100g of dry mineral powder into a 1000ml beaker at the same time, and stir at 350r / min for 2h at 80°C. Stop stirring and let stand for 10 minutes, filter the gypsum slag, dry and weigh the gypsum slag. Add 30g of 98wt% concentrated sulfuric acid to the filtered clear liquid, stir for 10 minutes, let stand for 40 minutes, filter the white phosphogypsum, dry and weigh the white phosphogypsum. The filtrate phosphoric acid was weighed for detection. The parameters of wet-process phosphoric acid and slag powder are shown in Table 4, and the result data are shown in Table 5 and Table 6:

[0027] Table 4

[0028] table 5

[0029]

[0030] Table 6

[0031]

[0032] From the above data, it can be seen that wet-process phosphoric acid and mineral powder are fed at a ratio of 6:1, and the average conversion...

Embodiment 3

[0034] Take P 2 o 5 Add 600g of 20wt% wet-process phosphoric acid and 50g of dry mineral powder into a 1000ml beaker at the same time, and stir at 350r / min for 2h at 80°C. Stop stirring and let stand for 10 minutes, filter the gypsum slag, dry and weigh the gypsum slag. Add 30g of 98wt% concentrated sulfuric acid to the filtered clear liquid, stir for 10 minutes, let stand for 40 minutes, filter the white phosphogypsum, dry and weigh the white phosphogypsum. The filtrate phosphoric acid was weighed for detection. The parameters of wet-process phosphoric acid and slag powder are shown in Table 7, and the result data are shown in Table 8 and Table 9:

[0035] Table 7

[0036] Table 8

[0037]

[0038] Table 9

[0039]

[0040] It can be seen from the above data that: wet-process phosphoric acid and mineral powder are fed at a ratio of 12:1, the amount of phospho...

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Abstract

The invention discloses a method for producing white gypsum being a by-product of wet process phosphoric acid and belongs to the technical field of production of phosphoric acid. The method comprises the following steps: (1) adding phosphorite powder into 15-25wt% of wet process phosphoric acid, controlling a liquid-solid ratio to be (12-15):1, controlling reaction temperature to be 75-90 DEG C, controlling reaction time to be 1-4 hours and filtering, wherein the content of phosphorus pentoxide in the phosphorite powder is 25-35wt%; (2) adding 93-98wt% of concentrated sulfuric acid into filtrate, stirring for reaction for 5-20 minutes, and carrying out solid-liquid separation to obtain white gypsum and phosphoric acid. A novel process of producing white phosphorous gypsum in the process of producing wet process phosphoric acid is developed; the production cost is reduced; the additional value is increased; the environmental pollution is reduced.

Description

technical field [0001] The invention belongs to the technical field of phosphoric acid production, in particular to a method for producing white gypsum, a by-product of wet-process phosphoric acid. Background technique [0002] The traditional sulfuric acid method produces a large amount of phosphogypsum as a by-product of wet-process phosphoric acid, which not only consumes a large amount of sulfur resources, but also produces about five tons of phosphogypsum residue for every ton of wet-process phosphoric acid produced. These phosphogypsums are of low quality and cannot be reused. Storing these phosphogypsums requires a lot of capital and land resources, and will also cause environmental pollution. Therefore, the development and utilization of phosphogypsum waste residue is an urgent problem that every phosphoric acid production enterprise is facing. Contents of the invention [0003] In order to solve the above problems and realize the economic benefit of the by-product...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/46C01B25/22
CPCC01F11/46C01B25/22
Inventor 李小洪叶良俊祝翠华杜念查炎华胡玉峰
Owner HUBEI XIANGYUN GROUP CHEM
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