Preparation and applications of wet-process strong phosphoric acid desulfurizing agent
A desulfurizer, concentrated phosphoric acid technology, applied in the field of phosphorus chemical industry, can solve the problems of high phosphorus content in filter residues, incomplete decomposition of phosphate rock, excessive phosphate rock, etc., and achieves rapid desulfurization, significant economic and environmental benefits, and desulfurization. good effect
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Examples
Example Embodiment
[0030] The preparation method of the desulfurizer is:
[0031] (1) When the phosphorus content is 0.4%~2.4%, the fluorine content is 0.4%~2.0%, SO 4 2- Add lime milk with a CaO concentration of 10%-25% to the wastewater with a content of 0.3%~0.8%. The amount of lime milk added is 1.5~2.4 times the mass of fluorine in the waste water. 1h, then filter to obtain purified liquid and solid phase precipitation residue;
[0032] (2) Add lime milk with a CaO concentration of 10% to 25% in the obtained purified liquid. The amount of lime milk added is 1.4 to 1.8 times the mass of phosphorus in the purified liquid with CaO in the lime milk, and the reaction is stirred at room temperature for 0.5 to 1.5 h, then filter, the filter cake is dried to obtain a desulfurizer, and the filtrate is purified and returned to the phosphoric acid production system as process water.
[0033] The application of desulfurizing agent in the removal of sulfate radicals in wet concentrated phosphoric aci...
Example Embodiment
[0036] Example 1
[0037] When the phosphorus content is 1.8%, the fluorine content is 1.2%, SO 4 2- 1 ton of wastewater with a content of 0.5% was added with 101kg of lime milk with a CaO concentration of 20%, stirred at room temperature for 40 minutes and then filtered to obtain purified liquid (1002kg, phosphorus content of 1.65%) and solid phase sedimentation residue.
[0038] 124kg of lime milk with a CaO concentration of 20% was added to the resulting purified liquid, stirred at room temperature for 1 hour and filtered to obtain a filter cake containing about 40% of free water. The filtrate was purified and returned to the phosphoric acid production system as process water. The filter cake is dried to obtain 105kg of desulfurizer, and its components and mass percentage are: CaHPO 4 ·2H 2 O: 74%, Ca(H 2 PO 4 ) 2 ·H 2 O: 4%, CaF 2 : 3%, CaSO 4 ·2H 2 O: 7%, CaCO 3 :3%, others are impurities.
[0039] Combine the obtained 109kg desulfurizer with P 2 O 5 20% phosph...
Example Embodiment
[0040] Example 2
[0041] When the phosphorus content is 2.4%, the fluorine content is 2.0%, SO 4 2- 1 ton of wastewater with a content of 0.8% was added with 192kg of lime milk with a CaO concentration of 25%, stirred at room temperature for 1 hour and filtered to obtain a purified liquid (979kg, with a phosphorus content of 2.0%) and a solid phase sedimentation residue.
[0042] Add 141kg of lime milk with 25% CaO concentration to the obtained purified liquid, stir and react for 1.5h at room temperature, and then filter to obtain a filter cake containing about 50% of free water. After purification, the filtrate is returned to the phosphoric acid production system as process water. The filter cake is dried to obtain 123kg of desulfurizer, and its components and mass percentage are: CaHPO 4 ·2H 2 O: 80%, Ca(H 2 PO 4 ) 2 ·H 2 O: 3%, CaF 2 :1%, CaSO 4 ·2H 2 O: 2%, CaCO 3 :5%, others are impurities.
[0043] Combine the obtained 141kg desulfurizer with P 2 O 5 30% phosphoric acid i...
PUM
Abstract
Description
Claims
Application Information
- R&D Engineer
- R&D Manager
- IP Professional
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap