Environment-friendly type dreg-free calcium hydrophosphate production formula and method

An environmentally friendly technology of calcium hydrogen phosphate, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of land occupation, difficulty in maintaining manufacturers, and impact on the environment, and achieve high yield, reliable resources, and white fertilizers. little effect

Inactive Publication Date: 2006-07-26
彭应廷
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

With the shortage of resources and environmental protection problems, if 200,000 tons / year of calcium hydrogen phosphate is produced, the tailings discharged will reach more than 400,000 tons / year, which seriously affects the environment and takes up a lot of land for stacking, making many manufacturers are difficult to maintain

Method used

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  • Environment-friendly type dreg-free calcium hydrophosphate production formula and method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment one: extract phosphorus test from calcined ore sample, all adopt 120 tons of standard ore sample, P 2 o 5 It is 15% pyrophosphate strontium ore, the ore consumption is 80 grams, the calcination temperature is 600 ° C, the calcination time is three hours, the concentration is 3N sulfuric acid, and the consumption is 384 milliliters. , extraction, extraction and filtration, the liquid and slag are treated separately: the phosphoric acid solution after extraction and filtration is matured and defluorinated, then filtered and adjusted to a pH value of 5.5 with milk of lime, and dried to obtain 24g of feed-grade calcium hydrogen phosphate, which is processed into a finished product Packing; slag after filtering, get 80 grams of 45-50% Fe after iron selection 2 o 3 , the slag after iron selection, extract strontium according to the conversion method, extract strontium carbonate, absorb through ion exchange resin, and get 2g of strontium chloride after elution wit...

Embodiment 2

[0018] Embodiment two: extract phosphorus test from calcined ore sample, all adopt 120 tons of standard ore sample, P 2 o 5 It is 15% pyrophosphate aluminum strontium ore, the ore dosage is 100 grams, the calcination temperature is 650°C, the calcination time is one hour, the concentration is 3N sulfuric acid, and the dosage is 400 milliliters. , extract, extract and filter the liquid and slag separately: the phosphoric acid solution after extraction and filtration is matured and defluorinated, then filtered and adjusted to a pH value of 5.5 with milk of lime, and then dried to obtain 30g of feed-grade calcium hydrogen phosphate for finished product Packing; slag after filtering, get 30 grams of 45-50% Fe after iron selection 2 o 3 , The slag after iron selection, extracts strontium according to the conversion method, extracts strontium carbonate, absorbs it through ion exchange resin, and obtains 3.33 grams of strontium chloride after elution with hydrochloric acid.

Embodiment 3

[0019] Embodiment three: extract phosphorus test from the calcined ore sample, all adopt 120 tons of standard ore samples, P 2 o 5 It is 15% strontium pyrophosphate, the ore consumption is 500 grams, the calcination temperature is 650 ℃, the calcination time is one hour, and the concentration is 3N sulfuric acid, and the consumption is 2 liters to extract. The method is that the raw ore is roasted and refined (ore powder), extract, extract and filter the liquid and slag respectively: the phosphoric acid solution after the extraction and filtration is matured and defluorinated, then filtered and adjusted to pH 5.5 with milk of lime, and then dried to obtain 150kg feed grade calcium hydrogen phosphate. Carry out finished product packing; The slag after filtering, get 150 grams of 45-50% Fe after selecting iron 2 o 3 , the slag after iron selection, extract strontium according to the conversion method, extract strontium carbonate, absorb it through ion exchange resin, and get 5...

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Abstract

The invention discloses an environment-friendly method to prepare CaHPO4 without slag. Wherein, using low-grade kribergite ore and/or kribergite fertilizer with given ratio to leach in diluted acid and obtain the feed-grade CaHPO4 up to national standard; treating the slag to extract the oxide with iron and strontium; with one ton of slag, sieving 45-50% Fe2O3 powder of one ton and 100kg strontia. This invention makes good use of slag, obtains benefit byproduction, can save much cost, and has great economic benefit.

Description

technical field [0001] The invention relates to an innovation in the production of calcium hydrogen phosphate, in particular to a new formula and method for producing calcium hydrogen phosphate in an environment-friendly tailless residue, which is suitable for manufacturers producing feed grade calcium hydrogen phosphate. Background technique [0002] Existing producers of feed grade calcium hydrogen phosphate need high-grade phosphate rock (P 2 o 5 grade above 28%) production. With the shortage of resources and environmental protection problems, if 200,000 tons / year of calcium hydrogen phosphate is produced, the tailings discharged will reach more than 400,000 tons / year, which seriously affects the environment and takes up a lot of land for stacking, making many manufacturers are difficult to maintain. Contents of the invention [0003] The purpose of the present invention is to overcome the defects of the above-mentioned prior art, and develop a new formula for produc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/32
Inventor 彭应廷彭俊彭阳彭欧
Owner 彭应廷
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