Method for producing qualified calcium superphosphate fertilizer with low-grade phosphate ore

A technology for producing qualified superphosphate and low-grade superphosphate, applied in the direction of superphosphate, phosphate fertilizer, application, etc., to achieve the effect of improving the utilization rate of fertilizer, reducing production cost, and speeding up curing speed

Inactive Publication Date: 2011-05-11
徐杰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reality is that more than 80% of the existing phosphate rock resources are low-grade ores, and there is no one in the prior art that can fully utilize low-grade phosphate rocks to produce the active ingredient P 2 o 5 Ways to achieve more than 12% qualified phosphate fertilizer products

Method used

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  • Method for producing qualified calcium superphosphate fertilizer with low-grade phosphate ore

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Experimental program
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Effect test

Embodiment 1

[0038] (1) pulp preparation: P 2 o 5 Phosphate rock with a content of 22-23% is crushed in two stages, and the particle size is controlled below 30mm. Measured according to dry matter, 100 parts of phosphate rock powder are sent to a ball mill and wet-milled with water to make the particle size ≥ 90 mesh, and ensure the water content 26%;

[0039] (2) Preparation of mixed acid: Take 45 parts of concentrated sulfuric acid and 15 parts of concentrated nitric acid, mix the two in the mixed acid pool, and cool the mixed acid to 100-110°C;

[0040](3) Preparation of superphosphate phosphate fertilizer: Place the above-mentioned phosphate rock slurry in a mixer, add the above-mentioned mixed acid under stirring, the acid addition process is generally 4 minutes, adjust the free acid concentration in the system to 17-20 %, transfer the mixed slurry from the discharge port of the mixer into the chemical conversion chamber, and keep the chemical conversion in the chemical conversion r...

Embodiment 2

[0042] (1) pulp preparation: complete according to the step (1) in embodiment 1;

[0043] (2) Preparation of mixed acid: take 50 parts of concentrated sulfuric acid and 10 parts of concentrated nitric acid, mix the two in the mixed acid pool, and cool the mixed acid to 100-110°C;

[0044] (3) Preparation of superphosphate phosphate fertilizer: complete according to step (3) of Example 1.

Embodiment 3

[0046] (1) pulp preparation: complete according to the step (1) in embodiment 1;

[0047] (2) Preparation of mixed acid: Take 55 parts of concentrated sulfuric acid and 5 parts of concentrated nitric acid, mix the two in the mixed acid pool, and cool the mixed acid to 100-110°C;

[0048] (3) Preparation of superphosphate phosphate fertilizer: complete according to step (3) of Example 1.

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Abstract

The invention discloses a method for producing qualified calcium superphosphate fertilizer with low-grade phosphate ore. The method is characterized by comprising the following steps: phosphate ore the P2O5 content of which is 22-23% is used as a raw material to prepare ore pulp with the water content of 27wt% by using 100 parts of dry phosphate ore powder as the reference; ore pulp reacts with the mixed acid of 45-55 parts of concentrated sulfuric acid and 5-15 parts of concentrated nitric acid by weight while the concentration of the free acid in the mixture system is controlled to 17-20%, the mixture system is transferred to an aging chamber and aged for 1 hour to prepare fresh fertilizer with the free acid concentration of 5.5-6.5%; and the fresh fertilizer is aged for 4-7 days to obtain the qualified calcium superphosphate fertilizer product with the P2O5 content of more than 12%. In the method of the invention, by adding nitric acid, the decomposition rate of phosphate ore is increased by 7-9% and the aging speed of the product is increased; the production cycle is only 4-7 days, which is reduced by about 50% compared with the traditional production method; and the production cost is reduced by 15-20%.

Description

technical field [0001] The invention relates to a method for producing phosphate fertilizer, in particular to a method for producing superphosphate with low-grade phosphate rock. Background technique [0002] The existing production method of superphosphate phosphate fertilizer (commonly known as calcium superphosphate) is to use medium and high-grade phosphate rock as raw material, add sulfuric acid to the crushed phosphate rock grains to carry out two-step chemical reaction, and make it generate phosphoric acid with one crystal water. Calcium dihydrogen, active ingredient P in the product 2 o 5 Reach above 12% (GB20413-2006). [0003] The so-called medium and high grade refers to the phosphorus content in the ore in terms of P 2 o 5 Measured, greater than 26%. [0004] The chemical reaction equation for the two-step chemical reaction is: [0005] Ca 5 (PO 4 ) 3 F+5H 2 SO 4 +1 / 2H 2 O=3H 3 PO 4 (liquid)+5CaSO 4 (1 / 2)·H 2 O (solid phase)↓+HF (gas)↑ [0006] ....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05B1/02
Inventor 徐杰杨波
Owner 徐杰
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