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Method for preparing sulfuric acid and co-producing slag cotton fiber from high-impurity phosphogypsum

A technology made of slag cotton fiber and gypsum, which is applied in chemical instruments and methods, sulfur compounds, manufacturing tools, etc., to achieve the effects of economic and ecological environmental benefits, reducing impact and reducing production costs

Active Publication Date: 2021-12-07
云南云天化环保科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention is just aiming at the common problem of co-production of cement with sulfuric acid from phosphogypsum at present, and proposes a method for co-production of slag wool fiber with high impurity phosphogypsum in the production of sulfuric acid

Method used

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  • Method for preparing sulfuric acid and co-producing slag cotton fiber from high-impurity phosphogypsum
  • Method for preparing sulfuric acid and co-producing slag cotton fiber from high-impurity phosphogypsum

Examples

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Effect test

Embodiment 1

[0068] The composition of raw materials used in this example and the following examples is shown in Table 1.

[0069] Raw material composition (mass fraction %) used in the embodiment of table 1

[0070]

[0071] 100 mass parts of phosphogypsum, 18.5 mass parts of fly ash, 8 mass parts of iron tailings and 10 mass parts of silica are crushed through a 40-mesh sieve, according to the moles of sulfur (S) in carbon (C) and phosphogypsum When the ratio is 0.8, 7.2 parts by mass of coke (with a fixed carbon content of 63.62%) is added, and the acidity index MK=1.32 and pH=4.40 of the batching meet the batching requirements of slag rock wool. All raw materials are mixed evenly and added with binder to make rod-shaped profiles, which are sent to a high-temperature reaction furnace for reduction, roasting and melting in sequence; the temperature of the reduction layer is controlled at 850°C, the average residence time of materials is 10.0 minutes, and the temperature of the roastin...

Embodiment 2

[0073] The phosphogypsum of 100 mass parts, the fly ash of 22.5 mass parts, the iron tailings of 25 mass parts are pulverized and crossed 40 mesh sieves, according to the molar ratio of sulfur (S) in charcoal (C) and phosphogypsum, add coke ( The fixed carbon content is 65.1%) and 8.0 parts by mass, the acidity index MK=1.46 and pH=4.29 of the batching, which meet the batching requirements of slag rock wool. All raw materials are mixed evenly and added with binder to make rod-shaped profiles, which are sent to a high-temperature reaction furnace for reduction, roasting, oxidation and melting in sequence; among them: the temperature of the reduction layer is controlled at 830°C, the average residence time of materials is 15.0 minutes, and the temperature of the roasting layer is 1200°C, the average residence time of the material is 10.0 minutes, the temperature of the molten layer is 1400°C, the average residence time of the material is 6.0 minutes, the molten slag is generated ...

Embodiment 3

[0075] The phosphogypsum of 100 mass parts, the fly ash of 17 mass parts, the iron tailings of 10 mass parts and the silica of 15 mass parts are pulverized through 40 mesh sieves, according to the mole of sulfur (S) in carbon (C) and phosphogypsum When the ratio is 0.85, 7.2 parts by mass of coke (68.21% of fixed carbon content) is added, and the acidity index MK=1.47 and pH=4.15 of the batching meet the batching requirements of slag rock wool. Mix all raw materials evenly and add binder to make a rod-shaped profile, send it into a high-temperature reaction furnace, and perform reduction, roasting and melting in sequence; among them: the temperature of the reduction layer is controlled at 780°C, the average residence time of the material is 18.0 minutes, and the temperature of the roasting layer is 1250 °C, the average residence time of the material is 4.0 minutes, the temperature of the molten layer is 1550 °C, the average residence time of the material is 3.0 minutes, the mol...

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Abstract

The invention provides a method for preparing sulfuric acid and co-producing slag cotton fiber from high-impurity phosphogypsum. According to the characteristics of phosphogypsum with high content of silicon, aluminum, magnesium and other impurities, calculation and burdening optimization are carried out, sulfur contained in the phosphogypsum is reduced into SO2 through reduction, roasting decomposition and melting, and when the phosphogypsum is used for preparing sulfuric acid, the obtained byproduct molten slag can be directly prepared into a slag cotton fiber product with high added value through a wire drawing, blowing or centrifuging process; the S element in the phosphogypsum is recycled, and the high silicon, aluminum, magnesium and other impurity components contained in the phosphogypsum are converted into the slag wool preparation raw material, such that the silicon, calcium and other raw materials required by the slag wool can be saved, the high value-added utilization of the phosphogypsum cinders is achieved, and the phosphogypsum acid production technology has advantages of economy and competitiveness; and the technical effect is prominent.

Description

technical field [0001] The invention relates to the technical field of producing sulfuric acid from phosphogypsum and the high-value utilization of slag, in particular to a method for co-producing slag cotton fiber by producing sulfuric acid from high-impurity phosphogypsum. Background technique [0002] Phosphogypsum is an industrial by-product of wet process production of phosphoric acid, and 4.5t-5.5t of phosphogypsum is produced for every 1t of phosphoric acid produced. The main component of phosphogypsum is CaSO 4 2H 2 O, and contains more SiO 2 and a small amount of MgO, Al 2 o 3 , Fe 2 o 3 ,P 2 o 5 , fluoride, organic matter and other impurities. The current stock of phosphogypsum in China is as high as about 750 million tons, with an annual increase of about 90 million tons, and the comprehensive utilization and disposal rate is less than 40%. A huge amount of phosphogypsum is concentrated in a special slag storage, which brings environmental protection and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/74C01B17/50C03C13/06C03B5/16C03B37/04C03B37/06
CPCC01B17/74C01B17/506C03C13/06C03B5/16C03B37/04C03B37/06Y02P40/50
Inventor 张晖屈凌波侯翠红宋慧林王好斌张建国谷守玉郭旭东资学民钟晋
Owner 云南云天化环保科技有限公司
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