Process of producing feed-grade calcium dihydrogen phosphate through phosphoric acid circulation impurity removal method

A technology of calcium dihydrogen phosphate and feed grade, which is applied in the field of production of feed grade calcium dihydrogen phosphate by the phosphoric acid cycle impurity removal method, which can solve problems such as waste of resources, and achieve the effects of saving costs, improving water solubility, and reducing emissions

Active Publication Date: 2015-08-12
GUIZHOU CHANHEN CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this process, the calcium in the phosphate rock is converted into CaCl 2 or CaSO 4 It is eliminated as an impurity, but in the subsequent production of calcium phosphate salt, a large amount of limestone powder needs to be added as a Ca source, which causes a great waste of resources.

Method used

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  • Process of producing feed-grade calcium dihydrogen phosphate through phosphoric acid circulation impurity removal method
  • Process of producing feed-grade calcium dihydrogen phosphate through phosphoric acid circulation impurity removal method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] The phosphate rock in Kaiyang, Guizhou was used as the raw material for the experiment, and the raw material indicators are shown in Table 1:

[0084] Table 1 Raw material index of phosphate rock in Kaiyang area, Guizhou

[0085] indicators

[0086] The temperature of phosphoric acid for reaction is raised to 60-80°C in the circulating heater, and treatment agent 1 (Na 2 S or P 2 S 5 ) and treatment agent 2 (prepared in advance, the composition is similar to the sedimentation impurities described in the present invention), and a small amount of white carbon black is added as a filter aid at the same time. React for 30 minutes and filter; the filter residue is washed countercurrently with a small amount of clean water, and the P in the residue is detected. 2 o 5 The content is 1.1%. Add the filtrate acid into the neutralization reactor and raise the temperature to 80-100°C, start feeding the ore, and detect the H in the slurry 3 PO 4 The concentration co...

Embodiment 2

[0088] The raw ore of a phosphate mine in Kunyang, Yunnan Province was used as the raw material for the experiment, and the indicators are shown in Table 2:

[0089] Table 2 Raw material indicators of a phosphate mine in Kunyang, Yunnan

[0090] indicators

[0091] After the ore powder is ground, it participates in the reaction, and the process control is the same as in Example 1. The product indicators are shown in Table 4.

Embodiment 3

[0093]Taking a phosphate rock in Fuquan area, Guizhou, after flotation experiment, the indicators are shown in Table 3:

[0094] Table 3 Raw Material Indicators of Guizhou Fuquan Phosphate Concentrate

[0095] indicators

[0096] The process control is the same as that in Example 1, and the filter press acid is recycled for 72 hours of continuous operation, and the final product is comprehensively sampled, and the indicators are as shown in Table 4.

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Abstract

The invention discloses a process of producing feed-grade calcium dihydrogen phosphate through a phosphoric acid circulation impurity removal method, wherein the method comprises following steps: (a) decomposing acid mine; (b) maintaining the temperature and performing sedimentation to obtain a slurry material; (c) feeding the slurry material to a crystallization trough, cooling the slurry material to 30-60 DEG C and performing solid-liquid separation to obtain a filtrate and a filter residue; (d) adding water to the filter residue for making material slurry of which the specific gravity is 1.30-1.60; (e) maintaining the temperature and performing sedimentation to obtain a material slurry; (f) feeding the material slurry in the step (e) to a dryer with high-temperature gas flow to dry the material slurry, and adding an alkaline substance to a dried product to obtain the feed-grade calcium dihydrogen phosphate product; and (g) mixing a filtrate in the step (c) with phosphoric acid by wet process, and removing impurities to obtain an acid liquid used for decomposing the acid mine in the step (a). The process is good in adaptability of phosphorus ore, can ensure the product in the step (f) and heavy metals to meet a standard completely, can reduce discharge load of phosphogypsum and is good in application prospect.

Description

technical field [0001] The invention belongs to the field of phosphate preparation, and in particular relates to a process for producing feed-grade calcium dihydrogen phosphate by a phosphoric acid circulation and impurity removal method. Background technique [0002] The world's demand for calcium phosphate began in 1940, when meat and bone meal and low-fluorine phosphate rock were initially used. At present, there are mainly three kinds of feed calcium phosphate products: calcium hydrogen phosphate (DCP); calcium dihydrogen phosphate (MCP); defluorinated calcium phosphate (DFP). There is also a large amount of intermediate components of calcium hydrogen phosphate and calcium dihydrogen phosphate, which can be produced by blending calcium hydrogen phosphate and calcium dihydrogen phosphate, or reacting according to the composition ratio during production, that is (MDCP). [0003] According to the survey, the consumption of phosphorus in the world is roughly in the form of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/32
Inventor 吴升平雷波李进邹建毛诚彭军
Owner GUIZHOU CHANHEN CHEM CO LTD
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