Method for preparing sylvite by pre-oxidizing-roasting semi-dry desulfurization ash and potassium feldspar

A semi-dry desulfurization and potassium feldspar technology, which is applied in chemical instruments and methods, alkali metal sulfite/sulfite, potash fertilizer, etc., can solve high oxidation cost, difficult subsequent treatment of waste liquid, and is not suitable for industrial production And other issues

Active Publication Date: 2021-11-19
CENT SOUTH UNIV
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  • Description
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  • Application Information

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Problems solved by technology

The oxidation cost of these methods is high, there is no suitable oxidation process equipment, and the follow-up treatment of waste liquid is difficult, so it is not suitable for industrial production

Method used

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  • Method for preparing sylvite by pre-oxidizing-roasting semi-dry desulfurization ash and potassium feldspar

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Effect test

Embodiment 1

[0032] Adding K to semi-dry desulfurization ash in a steel plant 2 Potassium feldspar with an O content of 8.6% is mixed according to the mass ratio of potassium feldspar: desulfurization ash is 1:5, and the first stage pre-oxidation is carried out at 400 °C, the oxidation time is 1.5h, and the oxygen content is 21% ( The remaining gas is nitrogen), and the pre-oxidation rate is 96.5%. Then, the pre-oxidized product is roasted in the second stage at 800° C. for 3 hours, and the recovery rate of potassium chloride obtained after the flue gas and dust is collected is 96.2%. The remaining solids are roasted at 1050°C in the third stage, the roasting time is 2h, the third-stage roasting flue gas is circulated to pre-oxidation, the third-stage roasted product is subjected to two-stage countercurrent leaching, and the first-stage countercurrent leaching uses the leachate obtained from the second-stage countercurrent. The roasted product is leached, the leaching solution obtained fr...

Embodiment 2

[0034] Adding K to semi-dry desulfurization ash in a steel plant 2 Potassium feldspar with an O content of 10.6% is mixed according to the mass ratio of potassium feldspar: desulfurization ash of 1:3, and pre-oxidized at 450°C, the oxidation time is 0.9h, and the oxygen content is 18% (the rest of the gas is Nitrogen), the pre-oxidation rate is 97.2%. Then, the pre-oxidized product is roasted in the second stage at 900° C. for 1.5 hours, and the recovery rate of potassium chloride obtained after the flue gas and dust is collected is 97.5%. The remaining solids are roasted at 1100°C in the third stage, the roasting time is 1h, the third stage roasting flue gas is circulated to pre-oxidation, the third stage roasted product is subjected to two-stage countercurrent leaching, and the first stage countercurrent leaching uses the leaching solution obtained from the second stage countercurrent. The roasted product is leached, the leaching solution obtained from the first-stage count...

Embodiment 3

[0036] Adding K to semi-dry desulfurization ash in a steel plant 2 Potassium feldspar with an O content of 13.4% is mixed according to the mass ratio of potassium feldspar: desulfurization ash is 5:4, and is pre-oxidized at 500°C, the oxidation time is 20min, and the oxygen content is 15% (the rest of the gas is nitrogen ), the pre-oxidation rate is 98.5%. Then, the pre-oxidized product is roasted in the second stage at 1000° C. for 0.5 h, and the recovery rate of potassium chloride obtained after the flue gas and dust is collected is 98.7%. The remaining solids are roasted at 1200°C in the third stage, the roasting time is 0.5h, the third stage roasting flue gas is circulated to pre-oxidation, the third stage roasted product is subjected to two-stage countercurrent leaching, and the first stage countercurrent leaching uses the leachate obtained from the second stage countercurrent To extract the roasted product, the leaching solution obtained from the first-stage countercurr...

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Abstract

The invention discloses a method for preparing sylvite by pre-oxidizing-roasting semi-dry desulfurizationash and potassium feldspar. The method comprises the following steps: mixing semi-dry desulfurizationash and potassium feldspar, and carrying out pre-oxidizing roasting at low temperature to obtain a mixed solid I; carrying out second-stage roasting on the mixed solid I at high temperature to recover potassium chloride and obtain a mixed solid II; carrying out third-stage roasting on the mixed solid II at a higher temperature to obtain a mixed solid III containing potassium sulfate; and recovering potassium sulfate from the mixed solid III through wet leaching, wherein leaching residues serve as raw materials of building materials or refractory materials. According to the method, full-component resource utilization of the semi-dry desulfurization ash is achieved, a sylvite chemical product with the high additional value can be obtained, the leaching residues can serve as raw materials of building materials or refractory materials, no harmful gas or solid or liquid is generated, and bulk, harmless and high-quality utilization of the semi-dry desulfurization ash is achieved.

Description

technical field [0001] The invention relates to a semi-dry desulfurization ash treatment method, in particular to a method for preparing potassium salt by pre-oxidizing and roasting semi-dry desulfurization ash and potassium feldspar, and belongs to the technical field of mineral processing. Background technique [0002] The semi-dry desulfurization process has the advantages of high desulfurization efficiency, no waste water generation, easy treatment and transportation, low investment, and small footprint. It is widely used in iron and steel metallurgy, thermal power generation, building materials and other industries. At present, more and more enterprises adopt the semi-dry desulfurization process, so that the production of semi-dry desulfurization ash increases year by year, and its annual production has exceeded 10 million tons. The "Environmental Protection Tax Law" amended on October 26, 2018 stipulates that if solid waste such as industrial by-product gypsum has not ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D5/00C01D3/04C05D1/02C04B35/66
CPCC01D5/00C01D3/04C05D1/02C04B35/66
Inventor 范晓慧甘敏刘琪英刘林程季志云孙增青陈许玲严泽凡黄晓贤袁礼顺
Owner CENT SOUTH UNIV
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