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Method and device for segmentally preparing sulfuric acid and mineral cotton fibers from ardealite

A technology of slag wool fiber and phosphogypsum, which is applied in chemical instruments and methods, glass manufacturing equipment, sulfur compounds, etc., can solve the problem of low resource utilization rate of phosphogypsum, and achieve fine slag wool fiber, good quality and high concentration Effect

Pending Publication Date: 2021-12-31
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 purpose of the present invention is to provide a method and device for preparing sulfuric acid and slag wool fiber in sections from phosphogypsum, so as to solve the problem of low resource utilization rate of existing phosphogypsum

Method used

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  • Method and device for segmentally preparing sulfuric acid and mineral cotton fibers from ardealite
  • Method and device for segmentally preparing sulfuric acid and mineral cotton fibers from ardealite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] figure 1 It shows a device for preparing sulfuric acid and slag wool fibers from phosphogypsum through a two-stage process, including a circulating fluidized bed 1, a mixing device 2, a high-temperature reaction furnace 3 and a high-speed centrifuge 4 connected in sequence, and the mixing device 2 is connected with a pre- The heat device 5, the tail gas outlet of the fluidized bed 1 are sequentially connected with the first dust removal device 6, the combustion device 7, and the tail gas washing system 12, and the high temperature reaction furnace 3 is connected with the second dust removal device 8, waste heat recovery device 9 and sulfuric acid production device 10 in sequence , the tail gas outlet of the sulfuric acid plant 10 is connected to the tail gas scrubbing system 12 .

[0052] The preparation method mainly includes the following steps:

[0053] S1. Add carbon-based reducing materials to powdery phosphogypsum; wherein the molar ratio of C in the reducing mat...

Embodiment 2

[0058] figure 2 It shows a device for preparing sulfuric acid and slag wool fibers from phosphogypsum through a three-stage process, including a circulating fluidized bed 1, a bubbling fluidized bed 11, a mixing device 2, a high-temperature reaction furnace 3 and a high-speed centrifuge 4 connected in sequence , the mixing device 2 is connected with a preheating device 5, the tail gas outlet of the fluidized bed 1 is connected with the first dedusting device 6, the combustion device 7, and the tail gas washing system 12 in sequence, and the high temperature reaction furnace 3 and the tail gas outlet of the bubbling fluidized bed 11 are connected with each other successively. The second dedusting device 8 , the waste heat recovery device 9 are connected with the sulfuric acid production device 10 , and the tail gas outlet of the sulfuric acid production device 10 is connected with the tail gas washing system 12 .

[0059] The preparation method mainly includes the following st...

Embodiment 3

[0066] The composition of the raw materials used in this example and the following examples is shown in Table 1.

[0067] Raw material composition (mass fraction %) used in the embodiment of table 1

[0068] CaO SiO 2

[0069] With 100 mass parts of phosphogypsum dry base, add 7.5 mass parts of coke (fixed carbon content is 63.62%) according to the molar ratio of carbon (C) and sulfur (S) in phosphogypsum is 0.8, send into circulating fluidized bed, temperature is 850°C, the average residence time of the material is 5.0 minutes, according to the batching requirements of slag wool, the acidity index Mk=1.35, pH=5.0 of the slag, 21.5 parts by mass of fly ash, 10 parts by mass of iron tailings and 15 parts by mass Part of silica is crushed through a 40-mesh sieve, preheated to 800°C, mixed with the hot discharge from the fluidized bed, sent to a high-temperature reaction furnace, and roasted and decomposed and melted in sequence; the temperature of the roasted dec...

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Abstract

The invention discloses a method and a device for segmentally preparing sulfuric acid and mineral cotton fibers from ardealite, and relates to the technical field of segmentally preparing sulfuric acid from ardealite and high-valued utilization of cinder of ardealite. The method comprises the following steps: reducing ardealite into a mixture of calcium sulfide and calcium sulfate through a circulating fluidized bed, mixing the mixture with preheated powdery compound materials of silicon, aluminum and magnesium, and feeding the mixture into a high-temperature reaction furnace for roasting and melting, or feeding the mixture into a bubbling fluidized bed for roasting and decomposing; and conducting mixing with preheated powdery compound materials of silicon, aluminum and magnesium, feeding the mixture into a high-temperature reaction furnace for melting, and preparing slag cotton fiber products with high additional value from molten slag through a blowing or centrifuging process. High-concentration SO2 flue gas is prepared in the roasting process and is used for preparing sulfuric acid. The material directly enters the reaction in the form of powder, and the reaction in each section is more complete through a sectional method, so that the concentration of the prepared SO2 flue gas is higher, the obtained slag cotton fiber is finer and better in quality, and the high value-added utilization of the ardealite cinders is realized.

Description

technical field [0001] The invention relates to the technical field of stagewise preparation of sulfuric acid from phosphogypsum and high-value utilization of cinders, in particular to a method and device for stagewise preparation of sulfuric acid and slag wool fibers from phosphogypsum. Background technique [0002] Phosphogypsum is an industrial by-product of wet process production of phosphoric acid. Every 1t of phosphoric acid produced produces 4.5t-5.5t of phosphogypsum. 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 a...

Claims

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Application Information

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IPC IPC(8): C01B17/52C01B17/74C03B37/00C03C13/06
CPCC01B17/52C01B17/74C03B37/00C03C13/06Y02P20/129
Inventor 张晖侯翠红郭旭东资学民王好斌钟晋谷守玉宋慧林王艳语张建国
Owner 云南云天化环保科技有限公司
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