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Method for producing phosphate by wet method phosphoric acid purification and hydrochloric acid decomposition for phosphate ore

A wet-process phosphoric acid and phosphate technology, applied in the fields of phosphate, chemical instruments and methods, phosphorus compounds, etc., can solve the problems of impurities interfering with low-grade phosphate rock, etc., and achieve the effect of solving the loss of phosphorus by impurities

Inactive Publication Date: 2007-08-01
黄尚勋 +1
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Problems solved by technology

[0008] In order to overcome the above-mentioned impurity interference when using wet-process phosphoric acid to produce phosphate and solve the problems of fully utilizing low-grade phosphate rock, the present invention proposes a method of using wet-process phosphoric acid or directly using unseparated phosphate rock acid hydrolysis solution to produce various A method of fine phosphate
[0010] (1) Technical solution 1: Technical solution 1 solves the problem of conversion and recovery of phosphorus pentoxide lost in impurity phosphate precipitates during the production of fine phosphate by various wet-process phosphoric acid (or phosphate)

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  • Method for producing phosphate by wet method phosphoric acid purification and hydrochloric acid decomposition for phosphate ore

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Embodiment

[0084] Embodiment: The present embodiment is the phosphorus-containing waste residue that produces in the production process when using agricultural ammonium dihydrogen phosphate and potassium chloride as raw material to produce potassium dihydrogen phosphate for conversion treatment, reclaims P 2 o 5 the experimental results. at 3m 3 In the stirred reaction vessel, add circulating phosphorus-containing slag conversion washing solution 2m 3 (P 2 o 5 =65.140g / l), add the phosphorus-containing waste residue 1000kg (P 2 o 5 =21.31%), add 230kg of ammonium bicarbonate, stir and react at 30-40°C for 1 hour, and feed ammonia gas to keep the pH of the reaction material=7.5-8.0. After the reaction is completed, filter and wash the filter cake. Obtain filtrate (add one washing water) 2.60 cubic meters, P 2 o 5 =131.53g / l, Fe in solution 2 o 3+Al 2 o 3 +CaO+MgO≤0.00015g / l. P in filtered calcium carbonate 2 o 5 =0.28% (calculated on a dry basis). The recovered solution i...

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Abstract

The invention discloses a wet method phosphor purifying and manufacturing method of phosphate, which is characterized by the following: decomposing impurity in kinds of fined phosphate through wet method; reacting carbonate and phosphate of ferric, aluminium, calcium and magnesium under certain condition; transmitting insoluble impurity phosphate into soluble phosphate with transmitting rate over 99%; transmitting entire phosphorus pentoxide into purified phosphate product; avoiding the loss of phosphor due to impurity sediment.

Description

Technical field [0001] The invention relates to a method for producing various fine phosphates by using wet-process phosphoric acid and effectively separating impurities in wet-process phosphoric acid, belonging to the technical field of phosphate production. [0002] The technology of using wet-process phosphoric acid to produce phosphate and effectively separate impurities referred to in the present invention refers to the wet-process phosphoric acid produced by using sulfuric acid to decompose phosphate rock or directly using hydrochloric acid (or other acidic substances, such as nitric acid) to decompose phosphate rock to obtain A mixed solution of acid hydrolysis products containing phosphoric acid and other impurities (such as chlorides of iron, aluminum, calcium, magnesium, etc.), in which phosphoric acid does not need to be separated and purified in advance. [0003] The method provided by the invention is applicable to any concentration of hydrochloric acid or nitric ...

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Application Information

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IPC IPC(8): C01B25/234C01B25/26
Inventor 黄尚勋黄明科
Owner 黄尚勋
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