Process for increasing fodder/ fertilizer ratio of fodder level calcium hydrogen phosphate

A calcium hydrogen phosphate, feed-grade technology, applied in the field of feed-grade calcium hydrogen phosphate or rich calcium phosphate, can solve the problems that have not yet been seen, and achieve the effects of improving the recovery rate, increasing the ratio of feed and fertilizer, and reducing production costs.

Inactive Publication Date: 2005-06-22
四川川恒控股集团股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the production methods of calcium hydrogen phosphate are produced by wet-process phosphoric acid and calcium carbonate or milk of lime after defluorination and then neutralized with milk of lime. Improve the feed-to-fertilizer ratio (the ratio of phosphorus entering the feed-grade product to that entering the fertilizer-grade calcium hydrogen phosphate during the production of feed-grade calcium hydrogen phosphate), reduce the production cost of feed-grade calcium hydrogen phosphate, and reduce or eradicate production wastewater Pollution to nature, but so far, no relevant reports have been seen

Method used

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  • Process for increasing fodder/ fertilizer ratio of fodder level calcium hydrogen phosphate
  • Process for increasing fodder/ fertilizer ratio of fodder level calcium hydrogen phosphate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Pump 2 / 3 height of phosphorus-containing mother liquor (including calcium hydrogen phosphate neutralization mother liquor, centrifuge mother liquor, tail gas washing liquid) into the stirring neutralization reaction tank of Φ2500×2800, and slowly add lime milk (specific gravity 1.05) to pH7.5, then keep stirring for 30 minutes, pump the well-reacted slurry to a plate-and-frame filter press for filtration, after filtering, the clear liquid pH7.3 contains 0.15 g / l of phosphorus (calculated as P), It can be discharged directly; get 315Kg of filter cake (water content 55%, P7.22%, Ca9.81%), mix this filter cake with 400Kg of dry calcium hydrogen phosphate, send it into the air dryer for drying, and get 536Kg of dry material (P16.2%, Ca20.75%, F0.169%). Add 150Kg of this material into the mixing reactor, 8Kg of 85% thermal phosphoric acid (diluted), stir well, add quicklime powder 2.8Kg, stir well, send to the storage yard for aging for 5 hours, dry and sieve to obtain calci...

Embodiment 2

[0031] Add 150Kg of the above-mentioned dried filter cake material into the mixing reactor, and add wet-process phosphoric acid defluorination solution (containing P 2 o 5 14.2%, F0.06%) 25Kg, add unslaked lime powder 2.5Kg after stirring evenly, send off slaking for 5 hours after stirring thoroughly, dry, sieve, obtain calcium hydrogen phosphate 157Kg, its quality index is as follows:

[0032] Phosphorus content (calculated as P) 17.15%, calcium content (calculated as Ca) 21.32%,

[0033] The fluorine content (calculated as F) is 0.16%, and the indicators of arsenic and lead are qualified.

Embodiment 3

[0035] Pump 2 / 3 height of phosphorus-containing mother liquor (including calcium hydrogen phosphate neutralization mother liquor, centrifuge mother liquor, tail gas washing liquid) into the stirring neutralization reaction tank of Φ2500×2800, and slowly add lime milk (specific gravity 1.05) to pH7.5, then kept stirring for 30 minutes, and the well-reacted slurry was pumped to a plate-and-frame filter press to filter, and after filtering, the clear pH was 7.3, containing 0.13g / l of phosphorus (in terms of P). Direct discharge; Obtain filter cake 380Kg (moisture 58%, P7.03%, Ca9.72%), this filter cake is added in the mixing reactor, adds 85% thermal process phosphoric acid 15Kg and 100Kg wet process phosphoric acid defluorination liquid (containing P 2 o 5 14.2%, F0.06%), after stirring for 2 hours, send to dry in the spray drier, sieve, obtain rich calcium phosphate 204Kg, its quality index is as follows:

[0036] Phosphorus content (calculated as P) 19.57%, calcium content (...

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Abstract

The method of raising the ratio between feed level calcium biphosphate and fertilizer level calcium biphosphate during calcium biphosphate producing process features that the neutralized mother liquid after producing feed level calcium biphosphate, stoved tail gas washing liquid and centrifugal calcium biphosphate solution are mixed, neutralized with lime milk, centrifugated and filtered, and thefilter cake is mixed with phosphoric acid or wet process phosphoric acid, small amount of lime may be added to regulate calcium content, and the mixture is matured, dried and sieved to obtain feed level calcium biphosphate or rich feed level calcium phosphate. The said process raises the ratio and phosphorus recovering rate, reduces the phosphorus content in exhausted mother liquid and reduces environmental pollution.

Description

technical field [0001] The present invention relates to a kind of method that improves the feed-grade calcium hydrogen phosphate feed-to-fertilizer ratio, and the present invention especially relates to neutralizing the phosphorus-containing mother liquor in the feed-grade calcium hydrogen phosphate production system with milk of lime to pH7.0-7.5, and then the obtained The solid material is mixed and reacted with phosphoric acid or wet-process phosphoric acid defluorination solution, and then matured and dried to obtain feed-grade calcium hydrogen phosphate or rich calcium phosphate. Background technique [0002] Feed grade calcium hydrogen phosphate is a high-quality feed additive for livestock and poultry. It provides indispensable phosphorus and calcium elements for the growth and development of livestock and poultry. It can enhance the blast resistance and disease resistance of livestock and poultry, and prevent chondrosis and paralysis disease, pullorum and prevent pic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A23K20/24C01B25/32
Inventor 李光明李光春周登荣
Owner 四川川恒控股集团股份有限公司
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