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Method for reducing SO3 concentration in diluted phosphoric acid

A technology of dilute phosphoric acid and phosphoric acid, applied in the field of dilute phosphoric acid, can solve problems such as influence, and achieve the effect of reducing the cost of the concentration process and saving the cost of the extraction process

Inactive Publication Date: 2012-05-02
GUIZHOU KAILIN GRP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for reducing SO in dilute phosphoric acid 3 Concentration method to solve the impact on the quality of ammonium phosphate products due to the fluctuation of ore impurity content, and stabilize the quality of ammonium phosphate products

Method used

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  • Method for reducing SO3 concentration in diluted phosphoric acid
  • Method for reducing SO3 concentration in diluted phosphoric acid

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Embodiment

[0020] Guizhou Kailin (Group) Co., Ltd. has an annual output of 700kt of extracted phosphoric acid100%P 2 o 5 , as attached figure 1 , add a desulfurization tank between the phosphoric acid extraction tank and the dilute phosphoric acid storage tank, with a volume of 460m 3 , with 9 stirring paddles, double-layer paddles, rotating speed 69r / min, motor power 45kW.

[0021] Pass the filtered dilute phosphoric acid through the acid outlet pipe by 100m 3 / h is stably added to the desulfurization tank, and the ore pulp is also pumped into the desulfurization tank; before feeding, the filtered dilute phosphoric acid and the ore pulp are analyzed, and the dilute phosphoric acid SO 3 The concentration is 3.3%, the specific gravity is 1.31, the acid temperature is 60°C, the CaO content of the slurry is 46.12%, and the specific gravity is 1.85. According to the calculation formula, the addition amount of ore pulp is 3.55m 3 / h, that is, the acid ore ratio of the production process...

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Abstract

The invention relates to a method for reducing SO3 concentration in diluted phosphoric acid, which is characterized in that a desulfurizer is additionally arranged between a wet process phosphoric acid extraction tank and a diluted phosphoric acid storage tank, an ore pulp storage groove is connected into the desulfurizer through a pipeline, the diluted phosphoric acid obtained through filtering and extraction through the phosphoric acid extraction tank is connected to the desulfurizer through a pipeline, the desulfurizer is also connected to the diluted phosphoric acid storage tank through a pipeline, the diluted phosphoric acid obtained through the filtering and the extraction through the phosphoric acid extraction tank is pumped into the desulfurizer through a pump, simultaneously, ore pulp is also pumped into the desulfurizer, the diluted phosphoric acid and the ore pulp take reaction in the desulfurizer for reducing the free sulfuric acid content in the diluted phosphoric acid, and the desulfurized diluted phosphoric acid is pumped into the diluted phosphoric acid storage tank through the pump. The method has solves the problem of ammonium phosphate production affected by mass fluctuation of the phosphate ore and has the advantages that: (1) the quality of the ammonium phosphate product is stable, 1 percent of SO3 in the phosphoric acid is reduced, the total nutrient content of the produced monoammonium phosphate product is improved by about 1.0 percent, and the total nutrient content of the produced diammonium phosphate product is improved by about 0.6 percent; and (2) the extraction work procedure cost is saved, and simultaneously, the contraction work procedure cost is reduced.

Description

technical field [0001] The present invention relates to compositions of phosphorus, in particular to phosphoric acid, especially dilute phosphoric acid prepared by decomposing phosphate rock with sulfuric acid. Background technique [0002] In the production process of wet-process phosphoric acid, in order to obtain coarse, uniform, easy-to-filtrate and wash calcium sulfate dihydrate crystals and reduce phosphorus loss, the sulfuric acid used is usually in excess of 3% to 4%; when the impurity content of phosphate rock increases, even An excess of 8% is required. Obviously, this will increase the consumption of sulfuric acid for extracting phosphoric acid, and the product quality is difficult to meet the standard; especially in the case of direct production of phosphoric acid without ore dressing, the quality of phosphate rock fluctuates greatly. The content of impurities such as oxides and acid insolubles increases. In order to ensure the extraction conversion rate, gypsum ...

Claims

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Application Information

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IPC IPC(8): C01B25/222
Inventor 徐魁陈彬石永义廖吉星杨俊杰唐明亮石秀明蒲勇张强星何明凯潘礼富张玉华杨龙宋斌罗焕勇胡勇宋宇郑培俊李玉祥陈春李晓波覃文强
Owner GUIZHOU KAILIN GRP CO LTD
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