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De-silicication purifying method for fluorite for pre-melted slag

A purification method and pre-melted slag technology, which is applied in the field of fluorite purification, can solve the problems of low environmental protection, complicated process and high cost, and achieve the effect of improving grade, simple process and promoting development

Inactive Publication Date: 2015-06-10
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing fluorite desiliconization process is mainly aimed at low-grade fluorite ore, which has the disadvantages of low efficiency, high cost, complicated process and low degree of environmental protection

Method used

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  • De-silicication purifying method for fluorite for pre-melted slag
  • De-silicication purifying method for fluorite for pre-melted slag
  • De-silicication purifying method for fluorite for pre-melted slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Crush 200 kilograms of fluorite to 100 mesh, and leaching it with hydrofluoric acid with a concentration of 1.5mol / L in a 2000L reaction tank at a solid-to-liquid ratio (kg:liter) of 1:2.0. The leaching time is 9 hours. Obtain leaching solution, leaching slag and exhaust gas; rinse the leaching slag with deionized water with a water pressure of 0.5MPa for 10 minutes, and then dry it to obtain the final fluorite product; the exhaust gas is filled with 4000L of hydrogen with a concentration of 4.5mol / L 9m of sodium oxide solution 3 In the exhaust gas collection tank, carry out harmless treatment; add 168L of deionized water and 33L of industrial grade hydrofluoric acid solution containing 40wt% hydrogen fluoride to the leaching solution, and prepare the hydrofluoric acid with a concentration of 2.0mol / L for the next batch of fluorite to process. The percentages of chemical components of fluorite before and after treatment are shown in Table 1.

[0030] Product analysis ...

Embodiment 2

[0033] Crush 200 kg of fluorite to 150 mesh, and leaching it with hydrofluoric acid with a concentration of 2.0 mol / L in a 2000L reaction tank at a solid-to-liquid ratio (kg: liter) of 1:3.0. The leaching time is 10 hours. Obtain leaching liquid, leaching slag and exhaust gas; rinse the leaching slag with deionized water with a water pressure of 0.8MPa for 16 minutes, and then dry it to obtain the final fluorite product; the exhaust gas is filled with 4000L of hydrogen with a concentration of 4.4mol / L 9m of sodium oxide solution 3 In the exhaust gas collection tank, carry out harmless treatment; add 143L of deionized water and 59L of industrial-grade hydrofluoric acid solution containing 40wt% hydrogen fluoride to the leachate, and prepare the hydrofluoric acid with a concentration of 3.0mol / L for the next batch of fluorite to process. The percentages of chemical components of fluorite before and after treatment are shown in Table 2.

[0034] Product analysis result (wt%) in...

Embodiment 3

[0037] Crush 200 kg of fluorite to 200 mesh, and leaching it with hydrofluoric acid with a concentration of 3.0 mol / L in a 2000L reaction tank at a solid-to-liquid ratio (kg: liter) of 1:4.0. The leaching time is 12 hours. Obtain leaching solution, leaching slag and exhaust gas; rinse the leaching slag with deionized water with a water pressure of 1.2MPa for 14 minutes, and then dry to obtain the final fluorspar product; the exhaust gas is passed into a 4000L container with an initial concentration of 4.5mol / L 9m of sodium hydroxide solution 3 In the exhaust gas collection tank, carry out harmless treatment; add 2L of industrial grade hydrofluoric acid solution containing 40wt% hydrogen fluoride to the leachate, and prepare hydrofluoric acid with a concentration of 2.8mol / L to treat the next batch of fluorite; The percentages of chemical components of fluorite before and after treatment are shown in Table 3. After the sodium hydroxide solution in the waste gas collection tank...

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Abstract

The invention discloses a de-silicication purifying method for fluorite for pre-melted slag, and belongs to the technical field of fluorite purification. The method comprises the following steps: mixing fluorite in which SiO2 is less than or equal to 1.2 percent with hydrofluoric acid to be leached for 8-13 hours to obtain a leaching liquid, leaching slag and waste gas; washing the leaching slag by using deionized water and drying to obtain a fluorite product; introducing the waste gas into a 4-8 mol / L sodium hydroxide solution for performing innocent treatment; adding industrial-level hydrofluoric acid solution containing 40 percent by weight of hydrogen fluoride into the leaching liquid to prepare a solution with the concentration required by the acid leaching process for cyclic use. The fluorite purification process is simple in procedures, low in energy consumption, and high in cyclic utilization rate; the mass percentages of the obtained fluorite products are that CaF2 is more than or equal to 97 percent, SiO2 is less than or equal to 0.6 percent, and FeO is less than or equal to 0.2 percent; and high-quality raw materials are provided for production of high-quality pre-melted slag, and the fluorite is suitable for being popularized.

Description

technical field [0001] The invention belongs to the technical field of fluorite purification, and in particular relates to a method for desiliconization and purification of fluorite for pre-melted slag. Background technique [0002] Pre-melted slag is a necessary raw material for electroslag remelting to produce high-quality alloy steel. With the continuous improvement of the quality requirements for electroslag smelting products, higher requirements are also put forward for the composition and performance of the pre-melted slag used. Among them, when electroslag remelting smelts steel or alloy materials containing high alloying elements such as Ti and Al, if the SiO in the pre-melted slag 2 If the content exceeds 0.6%, the alloying elements such as Ti and Al in the alloy are easily burned, which greatly reduces the yield. Therefore, how to efficiently and cost-effectively convert SiO in pre-slag 2 It is a key problem to be solved urgently now that the content falls below...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/22B27K3/30
Inventor 李花兵姜周华冯浩张树才刘国海任翠东朱红春王琦周恩泽李恒
Owner NORTHEASTERN UNIV
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