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Method for producing triple superphosphate and co-producing calcium chloride by middle-low grade phosphate rock
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A high-grade superphosphate, low-grade technology, applied in chemical instruments and methods, calcium/strontium/barium chloride, phosphorus compounds, etc., can solve the problems of tight supply of sulfuric acid, insufficient sulfur resources, etc. The effect of high production cost and high filtration intensity
Inactive Publication Date: 2011-02-16
SICHUAN UNIV
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In addition, my country's sulfur resources are insufficient, mainly relying on pyrite to produce sulfuric acid, so the supply of sulfuric acid is tight
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Embodiment 1
[0040] In the present embodiment, the technological process of the method for producing double superphosphate and co-producing calcium chloride with medium and low-grade phosphate rock is as follows figure 2 As shown, the steps are as follows:
[0041] (1) Acid hydrolysis of phosphate rock powder 1
[0042] Phosphate rock powder 1: 1000g, particle size ≤ 1165μm (through 14 mesh sieve), containing 46% CaO, P 2 o 5 24% (mass percentage); Hydrochloric acid: 2500g, mass concentration 24% (by the residue eluate 167g of recovery, the eluate 398g of extracting organic phase and the hydrochloric acid 1935g of mass concentration 31% to be made into, hydrochloric acid consumption is: hydrochloric acid and 100% of the theoretical amount when the CaO in the phosphate rock powder 1 reacts completely);
[0043] During acidolysis, add phosphate rock powder 1 into an acidolysis tank equipped with hydrochloric acid, and react under normal pressure and stirring. The reaction time is 30 min...
Embodiment 2
[0059] In the present embodiment, the technological process of the method for producing double superphosphate and co-producing calcium chloride with medium and low-grade phosphate rock is as follows figure 2 As shown, the steps are as follows:
[0060] (1) Acid hydrolysis of phosphate rock powder 1
[0061] Phosphate rock powder 1: 1000g, particle size ≤ 1165μm (through 14 mesh sieve), containing 46% CaO, P 2 o 5 24% (mass percentage); Hydrochloric acid: 3314g, mass concentration 19% (by the residue eluent 420g of recovery, the eluate 810g of extraction organic phase, the water 53g that the evaporation concentration process of preparing calcium chloride produces and mass concentration 31 2031g of hydrochloric acid is made into, and the hydrochloric acid consumption is: 105% of theoretical amount when hydrochloric acid and the CaO in the phosphate rock powder 1 react completely);
[0062] During acidolysis, add phosphate rock powder 1 into an acidolysis tank equipped with ...
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Abstract
The invention relates to a method for producing concentrated superphosphate and coproducing calcium chloride through medium and low grade phosphorite, which comprises: firstly, using hydrochloric acid to perform acidolysis on powdered rock phosphate 1 which is medium and low grade powdered rock phosphate with the particle diameter of less than or equal to 1,165 mu m; secondly, performing partial extraction, namely performing countercurrent extraction on an acidolysis solution obtained in the first step, wherein P2O5 entering an organic phase accounts for 50 to 90 percent of the total mass of P2O5; thirdly, performing washing and back-extraction on the organic phase in the second step, and concentrating a back extract acid to prepare concentrated phosphoric acid; fourthly, performing neutralization reaction on a residual aqueous phase in the second step and lime cream, performing solid-liquid separation after the reaction is over, washing filter cakes to obtain calcium hydrophosphate, and performing evaporation, concentration and drying on filtrate to obtain the calcium chloride; and fifthly, using the concentrated phosphoric acid obtained in the third step to perform acidolysis onpowdered rock phosphate 2 which is medium and low grade powdered rock phosphate with the particle diameter of less than or equal to 74 mu m, adding the calcium hydrophosphate prepared in the fourth step for reaction after the acidolysis reaction is over, and drying reaction products to obtain the concentrated superphosphate after the reaction is over.
Description
technical field [0001] The invention belongs to the field of chemical fertilizer production, in particular to a production method of double superphosphate. Background technique [0002] Double superphosphate is a kind of chemical fertilizer, which can be used as base fertilizer or additional fertilizer for plants, and can also be used as an intermediate product with various fertilizers containing N and K 2 The raw materials of O and trace elements are further processed to make special compound fertilizers containing multiple nutrients and various composition ratios to meet the needs of different soils and crops. [0003] The traditional process of heavy superphosphate production is to decompose phosphate rock with sulfuric acid, obtain dilute phosphoric acid through leaching and filtration, and then use this concentrated phosphoric acid to decompose secondary phosphate rock with higher quality after concentration to obtain higher phosphorus content. 2 o 5 triple superphosp...
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