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A method for green production of high-quality superphosphate co-producing magnesium chloride from low-grade collophosphate rock

A green production and calcium superphosphate technology, applied in the direction of calcium superphosphate, magnesium chloride, chemical instruments and methods, etc., can solve problems such as impurity interference, achieve the effect of reducing magnesium content and increasing the content of phosphorus pentoxide in phosphate rock

Inactive Publication Date: 2019-02-01
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention proposes a method of utilizing hydrochloric acid to remove carbonate in collophosite to produce calcium superphosphate and co-produce magnesium chloride in view of the above-mentioned prior art, so as to solve the problem of impurity interference when directly utilizing high-magnesium and low-grade phosphate rock to produce phosphate fertilizer, and has the advantages of Remove magnesium, calcium carbonate, aluminum, iron and other impurities in phosphate rock, and at the same time increase the P of phosphate rock 2 o 5 content effect

Method used

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  • A method for green production of high-quality superphosphate co-producing magnesium chloride from low-grade collophosphate rock
  • A method for green production of high-quality superphosphate co-producing magnesium chloride from low-grade collophosphate rock

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Effect test

Embodiment 1

[0042] P in dry ore 2 o 5 , the contents of CaO and MgO are 22.74%, 40.64%, and 4.96%. With mechanical stirring, add phosphate rock slurry containing 210 grams of dry ore, take 105 mL of concentrated hydrochloric acid and add 105 mL of tap water, mix well and add to the constant pressure funnel, and react It is carried out at room temperature, and 1:1 hydrochloric acid is quickly added dropwise while the slurry is stirring. After the drop is completed, the reaction is continued for 15 minutes and then stopped, filtered with suction, and the solid is dried and weighed, and the weight is 155.4 grams. P in the solid phosphate concentrate 2 o 5 and MgO content are 29.04% and 1.32% respectively, which are directly used to prepare high-quality general calcium. Add 18mL of concentrated sulfuric acid equivalent to the amount of calcium ion substance in the obtained acid hydrolysis filtrate, and obtain calcium sulfate by centrifugal washing and drying, and remove calcium filtrate Ad...

Embodiment 2

[0044] P in dry ore 2 o 5 , the contents of CaO and MgO are 22.65%, 32.5%, and 7.8%. With mechanical stirring, add phosphate rock slurry containing 417.3 grams of dry ore, take 220mL of concentrated hydrochloric acid and add 220mL of tap water, mix well and add to the constant pressure funnel, and react It is carried out at room temperature, and 1:1 hydrochloric acid is quickly added dropwise while the slurry is stirring. After the drop is completed, the reaction is continued for 25 minutes, then stopped, filtered with suction, and the solid is dried and weighed, with a weight of 315.1 grams. P in the solid phosphate concentrate 2 o 5 , each content of MgO is 30.02%, 1.32%, add 37.5mL of concentrated sulfuric acid equivalent to the amount of calcium ion substance in the filtrate, get calcium sulfate through centrifugal washing, drying, add 90-100 milliliters of concentrated hydrochloric acid in the filtrate that removes calcium, be mixed with After 1:1 hydrochloric acid, ta...

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Abstract

The invention relates to a method for green-producing high-quality calcium superphosphate co-generated magnesium chloride by low-level collophanite, comprising steps of a, performing acid splitting on carbonate in the phosphorite by hydrochloric acid and preparing phosphorus concentrate; b, preparing high-purity calcium sulfate; c, preparing magnesium chloride; after concentrating the filter fluid to a certain volume, preparing magnesium chloride. The invention has the advantages that the method is applicable to prepare high-efficient phosphatic fertilizer by directly producing high-quality low-magnesium phosphorite in hydrochloric acid decomposition, carbonate of low-level phosphorite and in particular to high-magnesium phosphorite; no waste discharges during the whole technical flow; by applying the invention, the phosphorus pentoxide content of phosphorite is promoted through one acidolysis while content of magnesium oxide in the phosphorite is also reduced; thus the problem of agglomeration and poor phosphatic fertilizer quality caused by high magnesium content during the ordinary calcium production can be solved; the phosphorite therefrom is directly reacted with sulfuric acid, thus high-quality phosphatic fertilizer of which available phosphorus is improved to 16-18% P2O5 can be obtained.

Description

technical field [0001] The invention relates to a method for green production of high-quality calcium superphosphate and co-production of magnesium chloride from low-grade collophanite. Background technique [0002] The production of calcium superphosphate (calcium superphosphate) by phosphate rock is a very mature process. In the process of producing calcium superphosphate, when the raw ore contains high impurities such as iron, aluminum, magnesium, etc., the fluidity of the pulp will become poor, and the It will deteriorate the physical properties of the product (bonding and easy to wet), resulting in difficulties in the process of concentration and drying. Only slurry concentration and spray granulation can be used. The equipment is complicated and the energy consumption is high. To solve the above problems, it is generally used in production Add anti-caking agent. Because this production process not only has the problem of competing with the production of industrial pho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/32C01B25/455C01F5/30C01F11/46C05B1/02
CPCC01B25/32C01B25/455C01F5/30C01F11/46C05B1/02
Inventor 周红潘志权程清蓉
Owner WUHAN INSTITUTE OF TECHNOLOGY
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