A method for strengthening the separation of acid-insoluble matter in the process of decomposing phosphate rock with nitric acid
A technology for acid-insoluble and enhanced separation, applied in the field of nitric acid, can solve the problems of large phosphoric acid, etc., and achieve the effect of reducing filtration time and improving filtration efficiency
Active Publication Date: 2016-02-10
GUIZHOU RES INST OF CHEM IND
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Problems solved by technology
[0003] The purpose of the present invention is to provide a method for strengthening the separation of acid-insoluble matter in the process of decomposing phosphate rock with nitric acid to extract phosphoric acid, so as to solve the biggest technical problem of extracting phosphoric acid from phosphate rock with nitric acid, and to realize the effective separation of acid-insoluble matter
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Embodiment 1
[0014] Embodiment 1: take nitric acid, phosphate rock powder as raw material
[0015] The acid hydrolysis of phosphate rock still follows the existing industrial production process. The phosphate rock powder is 80% over 100 mesh, and the acid hydrolysis uses nitric acid with a mass fraction of 60% ± 5%, the dosage is 110% of the theoretical amount, the acid hydrolysis temperature is 60 ℃ ~ 65 ℃, and the residence time is 1.5 hours. The separation test of acid-insoluble matter is as follows:
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The invention discloses a method for reinforced separation of acid-insoluble substances during decomposition of phosphate rock with nitric acid for extraction of phosphoric acid. According to the method, a filter aid is added during decomposition of phosphate rock with nitric acid for preparation of phosphoric acid to influence the surface physical properties of acid-insoluble substances, which enables filterability of the acid-insoluble substances to be improved, so separation efficiency and effects of the acid-insoluble substances are reinforced. The method comprises the following concrete steps: step 1, surface modification of the acid-insoluble substances: a step of adding the filter aid during decomposition of phosphate rock with nitric acid for extraction of phosphoric acid so as to realize surface modification of the acid-insoluble substances and to reinforce filterability of the acid-insoluble substances; and step 2, separation of the acid-insoluble substances: a step of carrying out filtering with a vacuum filter or a plate-and-frame filter press after retention of a material in a reaction tank so as to allow an acidolysis liquid and the acid-insoluble substances to be rapidly and thoroughly separated. The method rapidly and thoroughly separates the acid-insoluble substances produced during decomposition of phosphate rock with nitric acid for extraction of phosphoric acid, shortens filtering time, improves filtering efficiency and is applicable to enterprises extracting phosphoric acid through decomposition of phosphate rock with nitric acid or directly producing nitric phosphate fertilizers.
Description
technical field [0001] The invention relates to nitric acid and also to phosphate rock, in particular to a method for strengthening the separation of acid-insoluble matter in the process of nitric acid decomposing phosphate rock to extract phosphoric acid. Background technique [0002] Nitric acid decomposes phosphate rock as a method of non-sulfur decomposition of phosphate rock to extract phosphoric acid, which has been paid more and more attention by people. However, from the discovery of the future of nitric acid to decompose phosphate rock by Russian scientists at the beginning of the last century to the systematic research carried out in the middle period, and the subsequent industrialization process, the problem of effective separation of acid-insoluble substances has not been completely solved. Up to now, the process of extracting phosphoric acid from nitric acid decomposing phosphate rock at home and abroad still adopts the method of natural sedimentation or cyclone...
Claims
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IPC IPC(8): B01D37/02
Inventor 张富强张钦
Owner GUIZHOU RES INST OF CHEM IND