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Method for producing feed grade calcium dihydrogen phosphate by using medium and low grade mixed phosphate rock

A low-grade calcium dihydrogen phosphate technology, applied in chemical instruments and methods, phosphorus compounds, wet separation, etc., can solve problems such as increasing preparation costs, restricting the development of feed-grade calcium dihydrogen phosphate, and increasing phosphoric acid consumption.

Inactive Publication Date: 2018-07-31
GUIZHOU INST OF METALLURGY & CHEM ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the research and production of feed grade calcium dihydrogen phosphate all use high-purity phosphoric acid as one of the raw materials, which undoubtedly further increases the consumption of phosphoric acid and increases the production cost, thus restricting the production of feed grade calcium dihydrogen phosphate. development of

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  • Method for producing feed grade calcium dihydrogen phosphate by using medium and low grade mixed phosphate rock

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Effect test

Embodiment 1

[0024] A method for producing feed-grade calcium dihydrogen phosphate by utilizing medium and low-grade mixed phosphate rocks, comprising the following steps:

[0025] 1. Crush the medium and low-grade silicon-calcium phosphate rock and the medium-low grade calcium-magnesium phosphate rock to less than 5mm respectively, and then mix the obtained medium-low-grade silicon-calcium phosphate rock powder with the medium-low grade calcium-magnesium phosphate rock powder Mix ore blending at a mass ratio of 1:5 to obtain mixed phosphate rock powder; P in the resulting mixed phosphate rock powder 2 o 5 content of 25%, MgO content of 4.5%, SiO 2 The content is 9.5%, iron aluminum sesquioxide R 2 o 3 The content is 3.5%;

[0026] 2. Add water to the mixed phosphate rock powder to grind the ore, and adjust the slurry to obtain an ore slurry with a mass concentration of 20-40%;

[0027] 3. Add inhibitors and collectors in turn to the pulp, stir and inflate reverse flotation to obtain ...

Embodiment 2

[0032] A method for producing feed-grade calcium dihydrogen phosphate by utilizing medium and low-grade mixed phosphate rocks, comprising the following steps:

[0033] 1. Crush the medium and low-grade silicon-calcium phosphate rock and the medium-low grade calcium-magnesium phosphate rock to less than 5mm respectively, and then mix the obtained medium-low-grade silicon-calcium phosphate rock powder with the medium-low grade calcium-magnesium phosphate rock powder Mix ore blending according to the mass ratio of 1:1-10 to obtain mixed phosphate rock powder; P in the resulting mixed phosphate rock powder 2 o 5 The content is 24-28%, MgO content is less than 5%, SiO 2 Content less than 10%, iron aluminum sesquioxide R 2 o 3 The content is less than 5%;

[0034] 2. Add water to the mixed phosphate rock powder to grind the ore, and adjust the slurry to obtain an ore slurry with a mass concentration of 20-40%;

[0035]3. Add inhibitors and collectors in turn to the pulp, stir a...

Embodiment 3

[0040] A method for producing feed-grade calcium dihydrogen phosphate by utilizing medium and low-grade mixed phosphate rocks, comprising the following steps:

[0041] 1. Crush the medium and low-grade silicon-calcium phosphate rock and the medium-low grade calcium-magnesium phosphate rock to less than 5mm respectively, and then mix the obtained medium-low-grade silicon-calcium phosphate rock powder with the medium-low grade calcium-magnesium phosphate rock powder Mix ore blending according to the mass ratio of 1:1-10 to obtain mixed phosphate rock powder; P in the resulting mixed phosphate rock powder 2 o 5 The content is 24-28%, MgO content is less than 5%, SiO 2 Content less than 10%, iron aluminum sesquioxide R 2 o 3 The content is less than 5%;

[0042] 2. Add water to the mixed phosphate rock powder to grind the ore, and adjust the slurry to obtain an ore slurry with a mass concentration of 20-40%;

[0043] 3. Add inhibitors and collectors in turn to the pulp, stir ...

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Abstract

The invention discloses a method for producing feed grade monocalcium phosphate through medium and low grade mixed phosphate ore. Medium and low grade siliceous calcareous phosphate ore and medium and low grade calcareous magnesia phosphate ore are crushed and mixed for ore blending; water is added, ore grinding is conducted, slurry is mixed, and an ore pulp is obtained; an inhibitor and a collecting agent are added into the ore pulp in sequence, and phosphate concentrate is obtained through reverse flotation; the phosphate concentrate and concentrated sulfuric acid are subjected to extracting reaction, and crude phosphoric acid is obtained through solid-liquid separation; purified diluted sulfuric acid is obtained through solid-liquid separation again; and calcium carbonate powder is slowly added into the purified diluted sulfuric acid, the weight ratio of P2O5 to Ca is controlled to be 3.5-4, a stirring reaction is carried out for 3-8 h under the condition of 40-100 DEG C, monocalcium phosphate slurry is obtained, and the slurry is filtered, dried and cured to obtain feed grade monocalcium phosphate products. According to the method, the medium and low grade mixed phosphate ore is used as the initial raw material and is directly prepared into the feed grade monocalcium phosphate through coordination of the process steps, so that the cost is low. In addition, the produced feed grade monocalcium phosphate is good in quality, and the manufacturing process is simple.

Description

technical field [0001] The invention relates to a method for producing feed-grade calcium dihydrogen phosphate by using phosphate rock, in particular to a method for producing feed-grade calcium dihydrogen phosphate by using medium and low-grade mixed phosphate rock. Background technique [0002] Feed grade calcium dihydrogen phosphate is suitable for livestock, poultry, aquatic products and other animals. It is a feed additive used to supplement the calcium and phosphorus nutrition of livestock, poultry and aquatic animals. It has the characteristics of high water solubility and high absorption rate. [0003] The main varieties of feed grade calcium phosphate salts are tricalcium phosphate, calcium hydrogen phosphate, and calcium dihydrogen phosphate, all of which are nutritional additives of mineral elements. Among them, calcium dihydrogen phosphate (MCP) is an excellent high-efficiency phosphate feed additive with high phosphorus content and high water solubility. It is a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B03B7/00C01B25/32
CPCB03B7/00C01B25/32
Inventor 刘安荣聂登攀王振杰朱明燕薛安宋浩波
Owner GUIZHOU INST OF METALLURGY & CHEM ENG