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Method for purifying ardealite by using autoclaved condensed water of aerated concrete

A technology of air-entrained concrete and phosphogypsum, which is applied in chemical instruments and methods, inorganic chemistry, calcium/strontium/barium compounds, etc., can solve the problems of difficult popularization and application, and large water demand in washing process, and solve the problems of large water demand, Good acid-base neutralization effect and excellent purification effect

Active Publication Date: 2021-06-18
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large amount of water required by the washing process and the problem of secondary discharge of wastewater, it is difficult to popularize and apply

Method used

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  • Method for purifying ardealite by using autoclaved condensed water of aerated concrete

Examples

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Embodiment 1

[0028] A method for purifying phosphogypsum by using autoclaved condensed water of aerated concrete, comprising the following steps:

[0029] S1: Wet ball milling, adding autoclaved condensed water to the phosphogypsum to make the water content of the phosphogypsum slurry 35%, and ball milling for 10 minutes.

[0030] S2: Stir and wash, add autoclaved condensed water at 50°C to the wet-milled phosphogypsum slurry to make the solid-to-liquid ratio of the slurry 1:1, stir for 20min at a speed of 100r / min, filter and dry Obtain purified phosphogypsum;

[0031] S3: The filtrate is reused, and the filtrate after washing and purifying the phosphogypsum is pumped to the autoclaved aerated concrete pulping workshop for recycling.

[0032] Preferably, in the step S1, the wet ball milling body is a ceramic ball, which is and A total of 5 specifications, and The proportion (mass ratio) of ceramic balls added is 10%: 20%: 35%: 20%: 15%, the average ball diameter is 38mm, and th...

Embodiment 2

[0034] A method for purifying phosphogypsum by using autoclaved condensed water of aerated concrete, comprising the following steps:

[0035] S1: Wet ball milling, adding autoclaved condensed water to the phosphogypsum to make the water content of the phosphogypsum slurry 50%, and ball milling for 15 minutes.

[0036] S2: Stir and wash, add autoclaved condensed water at 50°C to the wet-milled phosphogypsum slurry to make the solid-liquid ratio of the slurry 1:2, stir for 18min at a speed of 100r / min, filter and dry Obtain purified phosphogypsum;

[0037] S3: The filtrate is reused, and the filtrate after washing and purifying the phosphogypsum is pumped to the autoclaved aerated concrete pulping workshop for recycling.

[0038] Preferably, in the step S1, the wet ball milling body is a ceramic ball, which is and A total of 5 specifications, and The proportion (mass ratio) of ceramic balls added is 10%: 20%: 35%: 20%: 15%, the average ball diameter is 38mm, and the f...

Embodiment 3

[0040] A method for purifying phosphogypsum by using autoclaved condensed water of aerated concrete, comprising the following steps:

[0041]S1: Wet ball milling, adding autoclaved condensed water to phosphogypsum to make the water content of the phosphogypsum slurry 55%, and ball milling for 12 minutes.

[0042] S2: Stir and wash, add autoclaved condensed water at 50°C to the wet-milled phosphogypsum slurry to make the solid-to-liquid ratio of the slurry 1:3, stir for 15 minutes at a speed of 100r / min, filter and dry Obtain purified phosphogypsum;

[0043] S3: The filtrate is reused, and the filtrate after washing and purifying the phosphogypsum is pumped to the autoclaved aerated concrete pulping workshop for recycling.

[0044] Preferably, in the step S1, the wet ball milling body is a ceramic ball, which is and A total of 5 specifications, and The proportion (mass ratio) of ceramic balls added is 10%: 20%: 35%: 20%: 15%, the average ball diameter is 38mm, and th...

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Abstract

The invention relates to a method for purifying ardealite by using autoclaved condensed water of aerated concrete, which adopts the autoclaved condensed water discharged in the production process of the aerated concrete to wash and purify the ardealite, and uses the washing water (filtrate after washing the ardealite) for the production of the aerated concrete. The alkaline hot water characteristic of aerated concrete autoclaved condensed water is fully utilized, acidity of ardealite can be effectively neutralized, soluble P, F and organic matter can be removed, meanwhile, the ardealite dissolved in washing water is used for inhibiting digestion of lime in the standing gas forming process of aerated concrete slurry, ardealite purification and aerated concrete production are organically coupled in the whole process, secondary wastewater discharge is avoided, and the effect of treating waste with waste is achieved.

Description

technical field [0001] The invention relates to the technical field of phosphogypsum purification and impurity removal, in particular to a method for purifying phosphogypsum by using autoclaved condensed water of aerated concrete. Background technique [0002] Phosphogypsum is the main by-product of the phosphating industry. For every ton of phosphoric acid produced, about 4-5 tons of phosphogypsum are produced. In the past 10 years, the emission of phosphogypsum in my country has reached about 7.3 tons, and the utilization rate is only about 30%. A large amount of phosphogypsum accumulates and occupies land, pollutes the environment, and also poses safety hazards of dam failure. In the context of national green, low-carbon and high-quality development, the resource utilization of phosphogypsum is imminent. Phosphogypsum usually contains more than 85% dihydrate gypsum (CaSO 4 2H 2 O), providing a better material basis for resource utilization. The main component of phos...

Claims

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Application Information

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IPC IPC(8): C01F11/46C04B22/00
CPCC01F11/468C04B22/0046
Inventor 李国刚殷素红刘金娥覃华茂李从容
Owner SOUTH CHINA UNIV OF TECH