A silicon slag flotation method that effectively improves the recovery rate of silicon metal

A technology of silicon metal and recovery rate, applied in flotation, solid separation and other directions, to achieve the effect of simple operation, low cost and improving the quality of concentrate

Active Publication Date: 2020-02-07
云南永昌硅业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no relevant report on flotation in the recycling of silicon slag

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A silicon slag flotation method that effectively improves the recovery rate of silicon metal comprises the following steps:

[0038] 1) Silicon slag grinding: first grind the silicon slag until the particle size does not exceed 60 mesh, then use the slurry liquid to slurry the silicon slag powder until the concentration of the silicon slag slurry is 30wt%, and then carry out coarse grinding at room temperature. select, scan, select;

[0039] 2) Rough selection: add regulator to the adjusted concentration of silicon slag slurry to make the pH of the silicon slag slurry = 4, stir for 1 minute, then add activator, stir for 1 minute, add collector, stir for 2 minutes, then add foaming agent, after stirring for 1 min, open the inflation valve, and then scrape and bubble for 5 min to obtain roughing concentrate and roughing tailings;

[0040] 3) Sweeping: Add slurry liquid to the roughing tailings to a concentration of 30wt%, then add a regulator to make the pH of the silico...

Embodiment 2

[0045] A silicon slag flotation method that effectively improves the recovery rate of silicon metal comprises the following steps:

[0046] 1) Silicon slag grinding: first grind the silicon slag until the particle size does not exceed 60 mesh, then use the slurry liquid to slurry the silicon slag powder until the concentration of the silicon slag slurry is 45wt%, and then carry out coarse grinding at room temperature. select, scan, select;

[0047] 2) Rough selection: Add regulator to the adjusted concentration of silicon slag slurry to make the pH of the silicon slag slurry = 6, stir for 3 minutes, then add activator, stir for 3 minutes, add collector, stir for 5 minutes, then add foaming agent, after stirring for 5 minutes, open the inflation valve, and then scrape and bubble for 10 minutes to obtain roughing concentrate and roughing tailings;

[0048] 3) Sweeping: add slurrying liquid to the roughing tailings to a concentration of 45wt%, then add a regulator to make the pH...

Embodiment 3

[0054] A silicon slag flotation method that effectively improves the recovery rate of silicon metal comprises the following steps:

[0055] 1) Silicon slag grinding: first grind the silicon slag until the particle size does not exceed 70 mesh, then use the slurry to slurry the silicon slag until the concentration of the silicon slag slurry is 35wt%, and then carry out coarse grinding at room temperature. select, scan, select;

[0056] 2) Rough selection: add regulator to the adjusted concentration of silicon slag slurry to make the pH of the silicon slag slurry = 5, stir for 2 minutes, then add activator, stir for 2 minutes, add collector, stir for 3 minutes, then add foaming agent, after stirring for 2 minutes, open the inflation valve, and then scrape and bubble for 6 minutes to obtain roughing concentrate and roughing tailings;

[0057] 3) Sweeping: add slurrying liquid to the roughing tailings to a concentration of 35wt%, then add a regulator to make the pH of the silicon...

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Abstract

The invention discloses a silicon slag flotation method for effectively increasing the silicon metal recovery rate. The method comprises the following steps that 1, silicon slag is ground, wherein thesilicon slag is ground into silicon slag powder with the particle size not larger than 60 mesh, and then the silicon slag powder is pulpified by using a pulpifying solution; 2, roughing is carried out, wherein a chemical is added into the silicon slag slurry with an adjusted concentration for roughing, and rough concentrate and rough tailings are obtained; 3, scavenging is carried out, wherein apulpifying solution is added into the rough tailings till the concentration is 30-45 wt%, then a scavenging agent is added for scavenging, and scavenging concentrate and scavenging tailings are obtained; 4, concentration is carried out, wherein the rough concentrate and the scavenging concentrate are combined, then a pulpifying solution is added into the mixture till the concentration of the slurry is 20-35 wt%, then a concentration chemical is added for concentration, and silicon concentrate and concentrate tailings are obtained. Physical and chemical properties of the molten slag and metal silicon are different, firstly, the silicon slag is crushed, and then separation is carried out according to the floatability difference of minerals, so that the metal silicon and impurities are effectively separated, and efficient recycling of silicon slag resources is achieved.

Description

technical field [0001] The invention belongs to the technical field of silicon slag treatment, and in particular relates to a silicon slag flotation method for effectively improving the recovery rate of silicon metal. Background technique [0002] Industrial silicon is a product smelted in an electric furnace with silica as the raw material and carbonaceous raw material as the reducing agent. The content of silicon as the main component is about 98%. In the process of industrial silicon smelting and production, Fe 2 o 3 , SiO 2 , MgO, Al 2 o 3 , CaO, etc. due to different reduction temperatures, Fe 2 o 3 , SiO 2 Mostly reduced, Al 2 o 3 , MgO and CaO can only be partially reduced. Unreduced Al 2 o 3 , MgO and CaO and SiO 2 together to form slag. Some of this slag accumulates together to form a distinct light-colored slag block, confined to the grain boundaries, and well-defined; other slag becomes dark particles that can only be seen under the microscope, mixed...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B03D1/018B03D1/02B03D1/08B03D101/06B03D101/02B03D101/04
CPCB03D1/018B03D1/025B03D1/08B03D2201/02B03D2201/04B03D2201/06
Inventor 王世宇文建华卢国洪赵兴凡康万福张忠益任承伟梅志能王加良王正勇张藜徐加雄
Owner 云南永昌硅业股份有限公司
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