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Method for recycling fluorine resources in phosphate fertilizer production

A production method and resource recovery technology, applied to chemical instruments and methods, fluosilicic acid, phosphorus compounds, etc., can solve problems that cannot be explained, and achieve the effects of reducing waste, increasing economic benefits of resources, and saving mining

Inactive Publication Date: 2016-07-20
龚家竹
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, fluorine, which has a relatively high resource value in phosphate rock, has not been fully actively developed and utilized. In the past, it was only used as feed phosphate for special production and worked hard on "defluorination". The original patented technology only solved the problem of product quality and The economic problem of efficiency, but not the full recovery and utilization of fluorine resources in accordance with sustainable development, especially the production of fertilizer phosphate has almost no technical requirements for fluorine removal, the recovery and utilization of fluorine resources only stays at the time of production The recovery of a small amount of fluoride that escapes from the gas phase, such as the Chinese patent application with the application number 201310060645.X, let alone the resource recovery of fluorine from phosphoric acid liquid

Method used

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  • Method for recycling fluorine resources in phosphate fertilizer production
  • Method for recycling fluorine resources in phosphate fertilizer production
  • Method for recycling fluorine resources in phosphate fertilizer production

Examples

Experimental program
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Effect test

Embodiment 1

[0033] The present embodiment adopts the mode of continuous circulation treatment, and the percentage % in the present embodiment, unless otherwise specified, all refers to mass percentage;

[0034] see figure 1, the concentrated phosphoric acid 50000kg / h of wet-process phosphoric acid (concentrated phosphoric acid composition is shown in Table 1) is pumped into silicon dissolving tank 1 by pump, after adding the active silica of 140kg / h to dissolve, send in the fluorine precipitation tank 2, add containing The mixed solution 3157kg / h of 1400kg / h of the seed crystal slurry 1400kg / h of sodium fluorosilicate 20% and the 17% sodium dihydrogen phosphate and phosphoric acid that alkali solution tank 6 sends, carries out stirring precipitation reaction at normal temperature 60 minutes and crystallizes;

[0035] Reaction generates material 54697kg / h in the fluorine precipitation tank 2, sends in the filter press 3 by pump 7 and carries out solid-liquid separation, obtains filtrate 53...

Embodiment 2

[0041] As shown in the figure, pump 100.00t / h of concentrated phosphoric acid (see Table 2 for the composition) into the silicon dissolution tank 1, add 0.42t / h of active silicon oxide for dissolution, then send it into the defluorination precipitation tank 2, add 2.80t / h of the seed slurry containing 20% ​​sodium fluorosilicate and 5.92t / h of the mixed solution of 17% sodium dihydrogen phosphate and phosphoric acid sent by the alkali dissolution tank 6, and stirred and precipitated at room temperature for 60 minutes;

[0042] 109.14t / h of the reaction-generated material in the defluorination precipitation is sent to the filter press 3 by the pump 7 for solid-liquid separation, and 106.64t / h of the filtrate (52.92%P 2 o 5 , 0.06% F), and a filter cake containing 80% solids 2.50t / h; the filtrate is the recovered semi-finished product defluorinated phosphoric acid, which is used for the production of fertilizer phosphate or feed phosphate; the filter cake is sent to the sodium f...

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Abstract

The invention discloses a method for recycling fluorine resources in phosphate fertilizer production. The method comprises the following steps: adding active silicon into the fluorine left in phosphoric acid in phosphate fertilizer production for reacting so that all fluorine is left in the solution in a form of fluosilicic acid; and in the presence of a sodium fluosilicate seed crystal, precipitating a fluosilicate precipitate compound by using sodium phosphate. In the method, the fluorine recovery rate in wet-process phosphoric acid exceeds 98%, so that the resource economic benefit of the raw material phosphorus ore in phosphate fertilizer production is increased, and the waste of the fluorine resources is reduced. The mining of the fluorite resources is saved, the market needs for the fluorine resources are met, and the economic benefits and social benefits of the phosphate fertilizer production and processing are increased; and moreover, since the fluorine content in the fertilizer is reduced, the product quality of phosphate fertilizer is improved, and the requirement for chemical production for sustainable development is met.

Description

technical field [0001] The invention relates to the technical field of recycling and utilization of fluorine resources, in particular to a method for recycling fluorine resources in phosphate fertilizer production. Background technique [0002] Fluorine is called "special effect functional material", which is widely used in military industry, aerospace, metallurgy, electronics, textile, light industry, medicine and agriculture, etc. It is also an indispensable supporting material for other industries and has become a rapidly developing The "gold" industry of new chemical materials. Fluorite (CaF 2 ) mainly, the world's basic reserves are 600 million tons, and China's proven reserves are 324 million tons. Based on the fluorine content of 19.4%, the corresponding fluorine resources in the world and China are 116 million tons and 63 million tons. The world currently consumes 5 million tons of fluorspar annually, of which 2.6 million tons come from China. In the next 20 years...

Claims

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Application Information

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IPC IPC(8): C01B33/10C01B25/237
CPCC01B25/2375C01B33/103
Inventor 龚家竹
Owner 龚家竹
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