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Method of eliminating arsenic by fluosilicic acid

A technology of fluosilicic acid and arsenic content, applied in the direction of silicon halide compounds, etc., can solve problems such as loss of fluosilicic acid, increase of impurities in fluosilicic acid solution, etc., achieve the effect of less investment, good arsenic removal effect, and simple process flow

Active Publication Date: 2009-04-22
WENGFU (GRP) CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the removal of arsenic from fluosilicic acid solution, if sodium sulfide is used as the arsenic removal agent, since fluosilicic acid and sodium ions will form sodium fluosilicate with low solubility, unnecessary loss of fluosilicic acid will be caused; if phosphorus pentasulfide is used as the removal agent Arsenic agent that increases the undesirable impurity phosphorus in fluorosilicate solutions

Method used

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  • Method of eliminating arsenic by fluosilicic acid
  • Method of eliminating arsenic by fluosilicic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-9

[0017] Take 10 liters (density is 1.17 kg / liter) of fluosilicic acid solution with arsenic content of 67.2 mg / liter and a weight concentration of 18.2% recovered in the wet phosphoric acid concentration process in the reactor, and control the temperature at 60°C. The stirring speed is 200 rpm. After reaching the specified temperature, add 32.5-52.5 grams of ferrous sulfide under stirring, react for 30-110 minutes, let stand for 22 hours and then filter.

[0018] Table 1 Reaction conditions and results of arsenic removal by fluorosilicic acid solution

[0019]

Embodiment 10

[0021] It is 10 liters (density is 1.20 kilograms / liter) of the fluosilicic acid solution 10 liters (density is 1.20 kilograms / liter) of 90.0 mg / liter, weight concentration 19.5% that the arsenic content that the wet-process phosphoric acid concentration process reclaims is in the reactor, and the control temperature is 50 ℃, and stirring speed is 50 rpm. After the specified temperature was reached, 50.0 g of ferrous sulfide was added under stirring, reacted for 100 minutes, left to stand for 1 hour, and then filtered to obtain arsenic content of 0.4 mg / L in a 19.7% arsenic-free fluorosilicate solution.

Embodiment 11-18

[0023] Take 10 liters (density is 1.19 kg / liter) of fluosilicic acid solution with arsenic content of about 54.5 mg / liter and a weight concentration of 19.1% recovered in the wet phosphoric acid concentration process in the reactor, and control the temperature at 40-80°C. The stirring speed was 400 rpm. After reaching the specified temperature, add 45 grams of ferrous sulfide under stirring, react for 30-110 minutes, let stand for 6 hours and then filter. The arsenic content of the obtained arsenic-free fluorosilicate solution is shown in Table 2.

[0024] Table 2 Reaction conditions and results of arsenic removal by fluorosilicic acid solution

[0025]

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Abstract

This invention discloses a method for eliminating As to fluosilicic acid, which puts a fluosilicic acid solution containing 50-100mg / L As in a reactor with a beater, heats it with a vapour to 30-90deg.C and mixes it in the speed of 50-400r / m and adds an As-elimination agent steadily to the reactor in the weight of 0.1-0.6% that of fluosilicic acid solution, then reacts them for 30-200m and puts the solution into a cleaifying tank to be idled for 1-6h to be filtered to separate sulfide deposition of As to get a fluosilicic acid solution with low As.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a method for removing arsenic from a fluorosilicic acid solution. Background technique [0002] Fluorine is one of the important associated resources of phosphate rock. The fluorine content of phosphate rock is generally 3-4%. Depending on the processing method of phosphate rock and the recovery process of fluorine, the impurities contained in the by-product fluosilicic acid are also different. In the production of wet-process phosphoric acid, most of the fluoride entering dilute phosphoric acid is transferred to the gas phase during the concentration process of phosphoric acid, and after washing and absorption, fluosilicic acid with a concentration of 12-30% is obtained. The arsenic contained in phosphate rock also enters dilute phosphoric acid, and partly enters fluosilicic acid, making the arsenic content of fluosilicic acid more than tens of mg / L. Fluorosilicic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/10
Inventor 汤德元杨三可刘松林傅亚男汤正河张翠微柳玉松严永友
Owner WENGFU (GRP) CO LTD
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