Method for preparing zinc phosphate by using low-grade zinc oxide ores

A zinc oxide ore, low-grade technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., to achieve the effect of rich raw material sources, good economic benefits, and easy washing

Inactive Publication Date: 2015-01-07
INST OF MULTIPURPOSE UTILIZATION OF MINERAL RESOURCES CHINESE ACAD OF GEOLOGICAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The present invention uses low-grade zinc oxide ore as raw material to prepare the method for zinc phosphate, so far no report

Method used

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  • Method for preparing zinc phosphate by using low-grade zinc oxide ores

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Experimental program
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Effect test

Embodiment 1

[0027] In the ammonia leaching purification solution of low-grade zinc oxide ore, according to the Zn in the purification solution 2+ :H 2 SO 4 Add sulfuric acid (concentration 98%) at a molar mass ratio of 1:2.03-2.56, stir and react at room temperature for 35-40 minutes, let stand for 10-15 minutes and filter to obtain solid ammonium zinc sulfate, and dry at 65-75°C for 1-2 hours Standby; then prepare the dried ammonium zinc sulfate into an aqueous solution with a concentration of 40-60%, and then press ammonium zinc sulfate Zn 2+ : Na 3 PO 4 The molar ratio is 1:0.56~0.66, and a trisodium phosphate solution with a concentration of 25~50% is prepared, and the solution is slowly added to the zinc ammonium sulfate solution, and the reaction is kept at 75~85°C for 35~45 minutes while stirring, and then Filtrate, wash the filter cake with 150ml of water, and dry at 115-125°C for 2h-2.5h to obtain PO 4 3- Content≥45%, Zn 2+ High-purity zinc phosphate dihydrate products wit...

Embodiment 2

[0029] Measure 300ml of ammonia-ammonium sulfate leaching purification solution (the main chemical composition is shown in Table 1), add it to a 1L flat-bottomed beaker, press the purification solution Zn 2+ :H 2 SO 4 Add sulfuric acid (concentration 98%) at a molar mass ratio of 1:2.53, stir and react at room temperature for 40 minutes, and filter after standing for 10 minutes to obtain solid ammonium zinc sulfate; Aqueous solution, according to Zn 2+ : Na 3 PO 4 The molar ratio is 1:0.56, the concentration is 50% trisodium phosphate solution, and the solution is slowly added to the zinc ammonium sulfate solution, stirred and kept at 75°C for 30 minutes, after filtering and washing the filter cake with 150ml water, The white product of zinc phosphate tetrahydrate was obtained, and then dried at 110°C for 3 hours to obtain the product of zinc phosphate dihydrate, and the PO in the product was measured. 4 3- The content is 45.01%, Zn 2+The content is 45.09%. The product...

Embodiment 3

[0033] Measure 300ml of ammonia-ammonium sulfate leaching purification solution (the main chemical composition is shown in Table 1), add it to a 1L flat-bottomed beaker, press the purification solution Zn 2+ :H 2 SO 4 Add a sulfuric acid precipitant with a concentration of 98% at a molar mass ratio of 1:2.03, stir and react at room temperature for 50 minutes, let stand for 15 minutes and filter to obtain solid ammonium zinc sulfate, dry at 70°C for 2 hours for later use; then place in a 400mL flat-bottomed beaker Prepare the dried ammonium zinc sulfate into an aqueous solution with a concentration of 60%, according to Zn 2+ : Na 3 PO 4 The molar ratio is 1:0.62, and a trisodium phosphate solution with a concentration of 25% is prepared, and the solution is slowly added to the ammonium zinc sulfate solution, stirred and kept at 60°C for 50 minutes, and filtered, and the filter cake is washed with 150ml of water , the white product of zinc phosphate tetrahydrate was obtained...

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Abstract

The invention relates to a method for preparing zinc phosphate by using low-grade zinc oxide ores, and belongs to the technical field of inorganic chemical industry. The method comprises the following steps of: by using the low-grade zinc oxide ores as raw materials, leaching and purifying the low-grade zinc oxide ores by using ammonia-ammonium salt to obtain an ammonia leaching purified solution, adding a precipitator for reaction to generate a zinc-ammonium compound salt intermediate precipitation, then completely dissolving the intermediate so that the intermediate solution and a trisodium phosphate solution are subjected to liquid-liquid reaction to generate a zinc phosphate solid precipitation, and obtaining a high-purify powdery zinc phosphate dehydrate product after drying the zinc phosphate solid precipitation, wherein the high-purify powdery zinc phosphate dehydrate product has larger than or equal to 45% of PO4<3->, larger than or equal to 45% of Zn<+> and more than 98% of zinc phosphate and can be used as a raw material for a high-grade anticorrosive paint. The method has the advantages that the technology is simple, the raw materials are abundant in source and low in cost, the liquid-liquid reaction mode is adopted, the reaction speed of the raw materials is fast, and the encapsulation phenomenon is avoided. The product is easy to wash and has fine particle size (+45mum is less than or equal to 0.5%); and the yield of the product is more than 92%. The method not only can be used for promoting the development and utilization of the low-grade zinc oxide ores and but also greatly reducing the production cost of the zinc phosphate product.

Description

technical field [0001] The invention relates to a method for preparing zinc phosphate, in particular to a method for preparing zinc phosphate by using low-grade zinc oxide ore, which belongs to the technical field of inorganic chemical industry. Background technique [0002] Zinc phosphate, also known as phosphorus zinc white, is widely used in the coating antirust industry. Zinc phosphate for paint is also a kind of pollution-free anti-rust pigment that was applied earlier. The principle is that the zinc phosphate coating can form a layer of non-dynamic dense coating on the metal surface, passivate the metal surface, and protect the substrate surface from corrosion to achieve the purpose of rust prevention. [0003] After years of research and development, there are currently two main methods for preparing zinc phosphate: one is the direct method, that is, high-grade zinc oxide (ZnO≥99.7%) and industrial phosphoric acid (H 3 PO 4 ≥85%) by direct reaction; this method has...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/37
Inventor 李博刘亚川刘述平唐湘平
Owner INST OF MULTIPURPOSE UTILIZATION OF MINERAL RESOURCES CHINESE ACAD OF GEOLOGICAL SCI
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