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Method for preparing mineral wool through ardealite high-temperature melting and mineral wool

A high-temperature melting, phosphogypsum technology, applied in the field of phosphogypsum resource utilization, can solve the problems of glass phase structure, comprehensive utilization and disposal rate of less than 40%, and difficult utilization of phosphogypsum, so as to solve ecological and environmental problems and achieve benign health. The effect of developing and alleviating external dependence

Pending Publication Date: 2022-05-27
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The utilization of phosphogypsum is a worldwide problem. At present, the global stockpile is about 6 billion tons, and an annual increase of 200 million tons is added. In China, an annual increase of about 80 million tons is still dominated by slag storage, and the comprehensive utilization and disposal rate is less than 40%.
It can be seen that in the prior art, when utilizing phosphogypsum to prepare mineral wool, it is necessary to strictly control the temperature, residence time, and atmosphere conditions in different reaction stages, the process engineering is complicated, and the addition of carbon-based reducing agent must be strictly controlled at the same time. It is easy to generate too much CaS in the medium, and it cannot be completely oxidized to SO during roasting 2 , reduce the escape rate of sulfur, and at the same time, CaS cannot form a glass phase structure with other substances in the slag system, which affects the fiber-forming effect of slag wool fibers
Therefore, it is urgent to solve the problems of complex process conditions and low sulfur evolution rate of the existing phosphogypsum mineral wool

Method used

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  • Method for preparing mineral wool through ardealite high-temperature melting and mineral wool
  • Method for preparing mineral wool through ardealite high-temperature melting and mineral wool
  • Method for preparing mineral wool through ardealite high-temperature melting and mineral wool

Examples

Experimental program
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Effect test

Embodiment 1

[0048] (1) 6500 g of dehydrated phosphogypsum and 1800 g of silicon dioxide, 900 g of aluminum oxide, 300 g of magnesium oxide, 100 g of ferric oxide are mixed to obtain a mixture (in parts by weight, 65 parts of dehydrated phosphogypsum, 18 parts of silica parts, 9 parts of aluminum oxide, 3 parts of magnesium oxide, and 1 part of ferric oxide); wherein the preparation of dehydrated phosphogypsum is: placing the dihydrate gypsum in a Luoyang Juxing kiln at 250 °C for 10 min;

[0049] (2) send the mixture obtained in step (1) into Xingding kiln, then be heated to 1600 ℃ with a heating rate of 25 ℃ / min for 40min and carry out high temperature melting to obtain slag; the gained contains SO 2 The flue gas obtained by the three-turn three-suction process produces sulfuric acid;

[0050] (3) After the molten slag obtained in step (2) flows out from the bottom of the furnace, it is transported to the roller head of a four-roll centrifuge (SG~200*75, Nanjing Yalong) through a diversi...

Embodiment 2

[0053] (1) 5700 g of dehydrated phosphogypsum and 1350 g of silicon dioxide, 1000 g of aluminum oxide, 600 g of magnesium oxide, 60 g of ferric oxide were mixed to obtain a mixture (in parts by weight, 57 parts of dehydrated phosphogypsum, 13.5 parts of silica parts, 10 parts of aluminum oxide, 6 parts of magnesium oxide, and 0.6 parts of iron oxide); wherein the preparation of dehydrated phosphogypsum is: placing the dihydrate gypsum in a GWL-LB box furnace at 200°C for 20min calcination;

[0054] (2) send the mixture obtained in step (1) into XD~10L stirring frit furnace, then be heated to 1450 ℃ heat preservation treatment 100min with the heating rate of 20 ℃ / min and carry out high temperature melting, obtain slag; the gained contains SO 2 The flue gas obtained by the three-turn three-suction process produces sulfuric acid;

[0055] (3) the slag obtained in step (2) flows out from the bottom of the furnace to obtain mineral wool with an average diameter of 3.7 μm through hi...

Embodiment 3

[0057] (1) mix 6000 g of dehydrated phosphogypsum and 1000 g of silicon dioxide, 1200 g of aluminum oxide, 600 g of magnesium oxide, 60 g of ferric oxide to obtain a mixture (in parts by weight, 60 parts of dehydrated phosphogypsum, 10 parts of silica parts, 12 parts of aluminum oxide, 6 parts of magnesium oxide, and 0.6 parts of iron oxide); wherein, the preparation of dehydrated phosphogypsum is as follows: gypsum dihydrate is placed in a GWL-LB box furnace for calcination at 190° C. for 10 min;

[0058] (2) the mixture obtained in step (1) is sent into XD~10L stirring frit furnace, then the temperature is raised to 1500°C for 90min with a heating rate of 30°C / min to carry out high temperature melting to obtain slag; the gained contains SO 2 The flue gas obtained by the three-turn three-suction process produces sulfuric acid;

[0059] (3) After the molten slag obtained in step (2) flows out from the bottom of the melting furnace, it is transported to the roller head of the f...

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Abstract

The invention belongs to the technical field of ardealite resource utilization, and provides a method for preparing mineral wool by ardealite high-temperature melting, which comprises the following steps: firstly mixing ardealite with silicon dioxide, aluminum oxide, magnesium oxide and ferric oxide, then carrying out high-temperature melting at 1400-1700 DEG C, and finally carrying out injection or centrifugation to obtain the mineral wool. The ardealite, the silicon dioxide, the aluminum oxide, the magnesium oxide and the ferric oxide are used as raw materials and are directly melted at the high temperature of 1400-1700 DEG C, self-decomposition of the ardealite and melting and mixing of the ardealite decomposition product and other components are realized by a one-step method, a reduction process is omitted, a CaS crystal phase is not generated, and meanwhile, the escape rate of sulfur is increased; and finally, blowing or centrifuging to obtain the mineral wool. The result of the embodiment shows that the average diameter of the mineral wool prepared by the preparation method provided by the invention is 4.2 microns, and the sulfur escape rate is 98.95%.

Description

technical field [0001] The invention relates to the technical field of phosphogypsum resource utilization, in particular to a method for preparing mineral wool by high-temperature melting of phosphogypsum and mineral wool. Background technique [0002] Phosphogypsum is the solid waste of phosphoric acid produced by wet process, 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 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 utilization of phosphogypsum is a worldwide problem. At present, the global stockpile is about 6 billion tons, with an annual increase of 200 million tons, and China’s annual increase of about 80 million tons. . The accumulation of phosphogypsum not only brings ecological problems, but also causes waste of resources. At present, the state has issued a series of policy documen...

Claims

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Application Information

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IPC IPC(8): C03C13/06C03B37/00
CPCC03C13/06C03B37/00Y02P40/50
Inventor 侯翠红王艳语谷守玉张晖王好斌
Owner ZHENGZHOU UNIV
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