Method for extracting ferric phosphate from phosphorized waste residues
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A technology of phosphating waste residue and iron phosphate, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve problems such as environmental pollution, and achieve the effect of solving environmental pollution and improving economic benefits
Inactive Publication Date: 2014-06-04
CHONGQING ENERGY COLLEGE
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Problems solved by technology
For this kind of waste, enterprises adopt the method of "landfilling", which has caused pollution to the environment.
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Embodiment 1
[0019] One of the method that embodiment 1 extracts iron phosphate from phosphating waste residue
[0020] 1. Put the white powdery phosphating waste slag produced in the phosphating workshop into the reaction device, then add water, the weight ratio is phosphating waste slag: water = 1: 1, and stir evenly;
[0021] 2. Then slowly add concentrated hydrochloric acid to the reaction device until the white solid is completely dissolved;
[0022] 3. Filter the above solution with a sand core funnel; remove insoluble matter:
[0023] 4. Slowly add 2mol / L sodium hydroxide solution dropwise to the above filtrate, control the pH of the solution at 1.0, react for 3.5 hours, and filter with a sand core funnel;
[0024] 5. Take the filter cake, wash it with distilled water until it is neutral, and the pH is 6;
[0025] 6. Dry at 100° C. for 3 hours and crush to 300 mesh to obtain battery-grade ferric orthophosphate product.
Embodiment 2
[0026] Example 2 The second method of extracting iron phosphate from phosphating waste residue
[0027] 1. Put the white powdery phosphating waste residue produced in the phosphating workshop into the reaction device, then add water, the weight ratio is phosphating waste residue: water = 1: 1.2, and stir evenly;
[0028] 2. Then slowly add concentrated hydrochloric acid to the reaction device until the white solid is completely dissolved;
[0029] 3. Filter the above solution with a sand core funnel; remove insoluble matter;
[0030] 4. Slowly add 2mol / L sodium hydroxide solution dropwise to the above-mentioned filtrate, control the pH of the solution at 2.0, and after 2.5 hours of reaction, filter with a sand core funnel;
[0031] 5. Take the filter cake, wash it with distilled water until it is neutral, and the pH is 8;
[0032] 6. Dry at 110° C. for 2 hours, and crush to 300 mesh to obtain battery-grade ferric orthophosphate product.
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Abstract
The invention relates to a method for extracting ferric phosphate from phosphorized waste residues. The method comprises the following steps: adding water into powdery phosphorized waste residues, and uniformly stirring; then, slowly adding concentrated hydrochloric acid into a reaction device till the white solids are fully dissolved; filtering the solution and removing undissolved substances; slowly dropwise adding sodium hydroxide solution into the filtrate, controlling the pH of the solution to 1.0-2.0, reacting for 3+/-0.5 hours, and filtering; washing with distilled water to neutral; and drying and smashing to obtain a battery-grade ferric pyrophosphate product. According to the process of recovering and purifying ferric phosphate provided by the invention, the recovery rate of ferric phosphate reaches 90%, the content of Fe<3+> in the ferric phosphate product is greater than or equal to 29% (dihydrate), and Fe/P is equal to 0.97-1.0. According to the method provided by the invention, waste is turned to wealth, the problem that waste residues are discharged to cause the environmental pollution is solved, and the ferric phosphate product with a wide market prospect is extracted from phosphorized waste residues.
Description
technical field [0001] The invention relates to the utilization technology of the solid waste generated after the phosphating section in the processing and production of the auto parts factory and the anti-theft door factory. Background technique [0002] During the processing and production of auto parts, anti-theft doors and other enterprises, a large amount of white waste residue - solid waste will be produced after the phosphating process. The main components of this waste are iron phosphate, iron dihydrogen phosphate, calcium phosphate, and zinc phosphate. For this kind of waste, enterprises adopt the method of "landfill disposal", which has caused pollution to the environment. [0003] Iron phosphate is the main raw material for the preparation of lithium iron phosphate batteries, and can also be used as a catalyst and in the manufacture of ceramics. The ratio of phosphorus to iron in iron phosphate is the most critical performance index to measure the quality of iron...
Claims
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