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Method for preparing iron phosphate and method for preparing fertilizer from by-product

A technology for preparing fertilizers and iron phosphate, applied in phosphorus compounds, chemical instruments and methods, calcium/strontium/barium sulfate, etc., can solve the problems of low efficiency of iron phosphate preparation, inability to effectively reuse by-products, cumbersome procedures, etc. problem, achieve the effect of saving energy, saving production cost and simplifying the process

Pending Publication Date: 2022-05-10
GUIZHOU BATIAN ECOTYPIC ENG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, for the production of iron phosphate, one of the methods is to prepare iron phosphate with phosphorous concentrate, but for the existing process of preparing iron phosphate with phosphorous concentrate, there are more complicated procedures and lower iron phosphate preparation efficiency. Low-level problems, and the by-products formed during the production process cannot be effectively reused

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  • Method for preparing iron phosphate and method for preparing fertilizer from by-product

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Effect test

Embodiment 1

[0027] The method for preparing ferric phosphate that the present invention proposes, method step is as follows:

[0028] S1: Acid hydrolyzing the phosphorous concentrate with nitric acid, and filtering out the acid-insoluble matter to obtain the first solution;

[0029] S2: add sulfuric acid to the first solution in S1, after fully mixing and reacting, remove calcium sulfate by filtration to obtain the second solution;

[0030] S3: adding an iron source to the second solution in S2, and after fully reacting, the precipitate obtained through filtration is ferric phosphate.

[0031] The concentration of the nitric acid solution in S1 is 60%, and the mass ratio of the nitric acid to the phosphorus concentrate is 1.3:1. By adding a slight excess of nitric acid solution, it can ensure that the phosphorous concentrate is basically completely acidified, thereby increasing the yield of subsequent phosphoric acid and avoiding waste of resources. In addition, in the process of acidol...

Embodiment 2

[0039] The method for preparing ferric phosphate that the present invention proposes, method step is as follows:

[0040] S1: Acid hydrolyzing the phosphorous concentrate with nitric acid, and filtering out the acid-insoluble matter to obtain the first solution;

[0041] S2: add sulfuric acid to the first solution in S1, after fully mixing and reacting, remove calcium sulfate by filtration to obtain the second solution;

[0042] S3: adding an iron source to the second solution in S2, and after fully reacting, the precipitate obtained through filtration is ferric phosphate.

[0043] The concentration of the nitric acid solution in S1 is 55%, and the mass ratio of the nitric acid to the phosphorus concentrate is 1.2:1. By adding a slight excess of nitric acid solution, it can ensure that the phosphorous concentrate is basically completely acidified, thereby increasing the yield of subsequent phosphoric acid and avoiding waste of resources. In addition, in the process of acidol...

Embodiment 3

[0049] The method for preparing ferric phosphate that the present invention proposes, method step is as follows:

[0050] S1: Acid hydrolyzing the phosphorous concentrate with nitric acid, and filtering out the acid-insoluble matter to obtain the first solution;

[0051] S2: add sulfuric acid to the first solution in S1, after fully mixing and reacting, remove calcium sulfate by filtration to obtain the second solution;

[0052] S3: adding an iron source to the second solution in S2, and after fully reacting, the precipitate obtained through filtration is ferric phosphate.

[0053]The concentration of the nitric acid solution in S1 is 65%, and the mass ratio of the nitric acid to the phosphorus concentrate is 1.4:1. By adding a slight excess of nitric acid solution, it can ensure that the phosphorous concentrate is basically completely acidified, thereby increasing the yield of subsequent phosphoric acid and avoiding waste of resources. In addition, in the process of acidoly...

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Abstract

The invention discloses a method for preparing iron phosphate and a method for preparing a fertilizer from by-products, the method comprises the following steps: S1, carrying out acidolysis on phosphate concentrate through nitric acid, and filtering out acid insoluble substances to obtain a first solution; s2, adding sulfuric acid into the first solution in the S1, fully mixing and reacting, and filtering to remove calcium sulfate to obtain a second solution; s3, adding an iron source into the second solution in the step S2, fully reacting, and filtering to obtain a precipitate, namely iron phosphate; the concentration of the nitric acid solution in S1 is 55-65%, and the mass ratio of the nitric acid to the phosphate concentrate is (1.2-1.4): 1; the concentration of the sulfuric acid in the step S2 is 98%, and the amount of the sulfuric acid is 90-98% of the theoretical amount of calcium in the frozen mother liquor; the iron source in the step S1 is one or more of iron powder, iron oxide, ferrous oxide or ferric nitrate; the addition amount of the iron source is 90-95% of the theoretical amount required by complete reaction of the iron source and phosphoric acid in the second solution. The invention reduces the emission of wastes, fully utilizes nitric acid and phosphoric acid, and saves the cost.

Description

technical field [0001] The invention relates to the technical field of ferric phosphate production, in particular to a method for preparing ferric phosphate and a method for using by-products to prepare fertilizers. Background technique [0002] At present, for the production of iron phosphate, one of the methods is to prepare iron phosphate with phosphorous concentrate, but for the existing process of preparing iron phosphate with phosphorous concentrate, there are more complicated procedures and lower iron phosphate preparation efficiency. Low-level problems, and the by-products formed during the preparation process cannot be effectively reused. Contents of the invention [0003] Based on the technical problems in the background technology, the present invention proposes a method for preparing ferric phosphate and a method for using by-products to prepare fertilizers, reducing waste emissions, and simultaneously making full use of nitric acid and phosphoric acid, saving ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/37C01F11/46C05B11/06
CPCC01B25/375C05B11/06C01F11/46C01P2006/80
Inventor 黄德明赵国军方进刘法安黄仕英程静张凌云冯军强华建青
Owner GUIZHOU BATIAN ECOTYPIC ENG CO LTD