CN-122010157-A - Method and device for cooperatively recycling fluorine-aluminum element by utilizing fluorine-containing sludge

CN122010157ACN 122010157 ACN122010157 ACN 122010157ACN-122010157-A

Abstract

The invention provides a method and a device for cooperatively recycling fluorine-aluminum element by utilizing fluorine-containing sludge. The method for cooperatively recycling the fluorine-containing aluminum element by utilizing the fluorine-containing sludge comprises the following steps of mixing the fluorine-containing sludge with a calcium source to obtain a mixed material, sequentially granulating the mixed material, dehydrating, fixing fluorine and sintering to obtain a recycled product, wherein the dehydrating, fixing fluorine and sintering together form three-stage calcining, the dehydrating, fixing fluorine and sintering are sequentially carried out at elevated temperatures, and the recycled product comprises calcium fluoride and calcium aluminate. The method for cooperatively recycling the fluorine-containing sludge and the fluorine-containing aluminum element provided by the invention realizes recycling of the fluorine-containing sludge and solves the problems of environmental pollution and high treatment cost in the treatment of the fluorine-containing sludge in the prior art.

Inventors

YU YANWEN
WANG CHUNXIU
WANG DINGLIANG
LIU FANG
YANG LEI
XU PING
LU HUIFENG
KANG TINGTING
YANG YUE

Assignees

浙江沃乐科技股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260205

Claims (10)

1. The method for cooperatively recovering the fluorine-aluminum element by utilizing the fluorine-containing sludge is characterized by comprising the following steps of: mixing fluorine-containing sludge with a calcium source to obtain a mixed material; granulating, dehydrating, fixing fluorine and sintering the mixed material in sequence to obtain a recovered product; wherein the dehydration treatment, the fluorine fixing treatment and the sintering treatment jointly form three-stage calcination treatment, and the treatment temperatures of the dehydration treatment, the fluorine fixing treatment and the sintering treatment are sequentially increased; Wherein the recovered product comprises calcium fluoride and calcium aluminate.
2. The method of claim 1, wherein the calcium source comprises calcium oxide; and/or the fluorine-containing sludge comprises calcium element, the calcium source comprises calcium supplementing element, and the calcium element in the recovered product comprises the calcium element in the fluorine-containing sludge and the calcium supplementing element; And/or the mixed material comprises calcium element and aluminum element, wherein the molar ratio of the calcium element to the aluminum element is (1.4-2.2): 1; and/or the mass ratio of the fluorine-containing sludge to the calcium source is (1-1.6): 1.
3. The method according to claim 1, wherein the dehydration treatment is performed at a treatment temperature of 350 ℃ to 450 ℃ for a treatment time of 0.5h to 2h.
4. The method according to claim 1, wherein the treatment temperature of the fluorine fixing treatment is 800 ℃ to 900 ℃ and the treatment time is 0.5h to 2h.
5. The method according to claim 1, wherein the sintering treatment is performed at a treatment temperature of 1350 ℃ to 1400 ℃ for a treatment time of 1h to 3h.
6. The method of claim 1, wherein the granulating comprises ball-pressing the mixed material using a ball press; And/or after the granulating treatment, the particle size of the mixed material is 5 mm-15 mm.
7. An apparatus for carrying out the method for cooperatively recovering fluorine-aluminum element using fluorine-containing sludge according to any one of claims 1 to 6, characterized in that the apparatus comprises a dehydration treatment unit, a fluorine-fixing treatment unit, a sintering treatment unit; The outlet of the dehydration treatment unit is connected with the inlet of the fluorine fixing treatment unit, and the outlet of the fluorine fixing treatment unit is connected with the inlet of the sintering treatment unit.
8. The apparatus of claim 7, wherein the dehydration treatment unit comprises a dehydration chamber and a heat recovery assembly comprising a hot air jet, a hot air recovery duct, a hot air blower; The hot air nozzle is connected with the dehydration chamber; the hot air blower is connected with the hot air nozzle through the hot air recovery pipeline.
9. The apparatus of claim 8, wherein the fluorine fixing treatment unit comprises a fluorine fixing chamber, an inlet of the fluorine fixing chamber being connected with an outlet of the dehydration chamber.
10. The apparatus of claim 9, wherein the sintering treatment unit comprises a sintering chamber and an auxiliary assembly located above the sintering chamber; The inlet of the sintering chamber is connected with the outlet of the fluorine fixing chamber; The auxiliary assembly includes an auxiliary fuel inlet and a supplemental fuel nozzle; The auxiliary fuel inlet is connected with the supplemental fuel nozzle; the supplemental fuel ports are connected to the sintering chamber.

Description

Method and device for cooperatively recycling fluorine-aluminum element by utilizing fluorine-containing sludge Technical Field The invention relates to the technical field of sludge recycling, in particular to a method and a device for cooperatively recycling fluorine-aluminum elements by utilizing fluorine-containing sludge. Background Sludge with higher aluminum and fluorine content can be generated in the purification treatment process of fluorine-containing wastewater in industries such as electrolytic aluminum, photovoltaic, semiconductor, fluorine chemical industry and the like, and most of treatment modes of the sludge are incineration or landfill treatment at present, but the mode is high in cost, occupies land resources and causes secondary pollution to the environment. In the prior art, the slag melting agents such as calcium fluoride, calcium aluminate and the like mainly depend on non-renewable mineral resources, and the raw material exploitation cost is high and the industrial economy is poor. Therefore, there is a need for preparing a slag melting agent by recycling fluorine-containing sludge. Disclosure of Invention The invention provides a method and a device for cooperatively recycling fluorine-aluminum element by utilizing fluorine-containing sludge. The method for cooperatively recycling the fluorine-containing sludge and the fluorine-containing aluminum element realizes recycling of the fluorine-containing sludge, and the obtained recycling product comprises calcium fluoride and calcium aluminate after the mixed material is subjected to granulating treatment, dehydration treatment, fluorine fixing treatment and sintering treatment in sequence. The method for cooperatively recovering the fluorine-aluminum element by utilizing the fluorine-containing sludge solves the problems of environmental pollution and high treatment cost in the treatment of the fluorine-containing sludge in the prior art. In addition, in the method for cooperatively recovering the fluorine aluminum element by utilizing the fluorine-containing sludge, the fluorine element is fixed in the form of calcium fluoride in a first step before calcium aluminate is generated by sectional temperature control, and then the fluorine element is compounded with the calcium aluminate obtained in a later step, so that a product finally obtained by cooperatively recovering can be used as a slag melting agent, the forward utilization of fluorine impurities in the original fluorine-containing sludge is realized, and the complex treatment of hydrogen fluoride gas and the corrosion of equipment such as pipelines are avoided. In a first aspect, an embodiment of the present invention provides a method for cooperatively recovering an aluminum fluoride element by using a fluorine-containing sludge, including the steps of: mixing fluorine-containing sludge with a calcium source to obtain a mixed material; granulating, dehydrating, fixing fluorine and sintering the mixed material in sequence to obtain a recovered product; wherein the dehydration treatment, the fluorine fixing treatment and the sintering treatment jointly form three-stage calcination treatment, and the treatment temperatures of the dehydration treatment, the fluorine fixing treatment and the sintering treatment are sequentially increased; Wherein the recovered product comprises calcium fluoride and calcium aluminate. Some embodiments of the invention, the calcium source comprises calcium oxide; and/or the fluorine-containing sludge comprises calcium element, the calcium source comprises calcium supplementing element, and the calcium element in the recovered product comprises the calcium element in the fluorine-containing sludge and the calcium supplementing element; And/or the mixed material comprises calcium element and aluminum element, wherein the molar ratio of the calcium element to the aluminum element is (1.4-2.2): 1; and/or the mass ratio of the fluorine-containing sludge to the calcium source is (1-1.6): 1. In some embodiments of the invention, the dehydration treatment is performed at a treatment temperature of 350-450 ℃ for 0.5-2 hours. According to some embodiments of the invention, the treatment temperature of the fluorine fixing treatment is 800-900 ℃ and the treatment time is 0.5-2 h. In some embodiments of the present invention, the sintering treatment is performed at a treatment temperature of 1350 ℃ to 1400 ℃ and a treatment time of 1h to 3h. Some embodiments of the invention, the granulating process comprises performing a ball pressing process on the mixed material using a ball pressing machine; And/or after the granulating treatment, the particle size of the mixed material is 5 mm-15 mm. In a second aspect, an embodiment of the present invention provides an apparatus for implementing the method for cooperatively recovering fluorine-aluminum element using fluorine-containing sludge according to any one of the embodiments of the first aspect, where the apparatu