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Method for preparing refined ferrosilicon by utilizing silicon slag

A technology for ferrosilicon and silicon slag, which is applied in the field of preparing and refining ferrosilicon by using silicon slag, can solve the problems of high energy consumption and complicated processes in production, and achieve the effects of high purity and increased added value.

Inactive Publication Date: 2019-01-29
内蒙古鄂尔多斯电力冶金集团股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Although the above prior art can purify or separate silicon or silicon alloys in silicon slag by physical principles or thermochemical principles, several silicon-based composite ferroalloys can also be produced, but the separation purity of the silicon slag is , as well as the high energy consumption and complicated process of production, it needs further technical improvement

Method used

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Examples

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Effect test

Embodiment 1

[0030] This embodiment provides a method for preparing and refining ferrosilicon by using silicon slag. In the method, silicon slag produced in the production process of ferrosilicon is further processed into ferrosilicon with a trace amount of slag, and the silicon slag is remelted and subjected to secondary Secondary refining produces qualified refined ferrosilicon.

[0031] Specifically include the following steps:

[0032] a. Deep processing of silicon slag, use color sorter to accurately identify slag and ferrosilicon through electro-optical 32-bit true color image processing method and high-precision full-color CCD sensing technology, and apply gas pressure to separate the slag and ferrosilicon in silicon slag. Effective separation, color sorting recognition accuracy / 99% Sorting accuracy, application of gas pressure / Air pressure 0.3 ~ 0.6Mpa, after separation of ferrosilicon, the embedded amount of silicon slag is less than 0.6% ~ 1%.

[0033] b. Use a power frequency f...

experiment example

[0044] The special-purpose silicon slag deep processing equipment used in Example 1 selects ferrosilicon from the silicon slag with high purity, and in the remelting process of the application power frequency furnace, adding a refining synthetic flux, the refined product produced meets the standard requirements .

[0045] In Comparative Example 1, the deep processing of silicon slag used jumping water-flushing flotation equipment, the purity of ferrosilicon separated from silicon slag was low, and the amount of silicon slag embedded in the separated ferrosilicon was less than 10% to 25%.

[0046] Ferrosilicon and slag are not easy to separate, and the separated ferrosilicon contains a lot of water and needs to be dried or dried before remelting production. The process is complicated and the cost is high.

[0047] In Comparative Example 2, the ferrosilicon selected by deep processing was used to directly remelt to produce refined ferrosilicon, and the impurity elements such as...

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PUM

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Abstract

The invention provides a method for preparing refined ferrosilicon by utilizing silicon slag. The method comprises the following steps of identifying and separating slag and ferrosilicon in the silicon slag by utilizing a photoelectric detection technology, melting the ferrosilicon at 1550-1650 DEG C to obtain ferrosilicon melt, and adding a synthetic flux into the ferrosilicon melt; and the synthetic flux comprises quartz sand, lime, dolomite and calcite. According to the method, the ferrosilicon and the slag in the silicon slag can be separated thoroughly, and the purity of the selected ferrosilicon is high; remelting refining on the separated ferrosilicon and a specific synthetic flux is carried out, and the produced refined ferrosilicon completely meets the standards and requirements of customers.

Description

technical field [0001] The invention relates to the technical field of silicon alloy preparation, and more particularly, to a method for preparing refined ferrosilicon using silicon slag. Background technique [0002] Silicon slag is a by-product of the high-silicon alloy production process, and its output accounts for about 8% to 12% of the high-silicon alloy output. The proportion of alloy in the silicon slag is about 40% to 50%, and it is bonded to the slag in the form of mosaic. At present, silicon slag is sold at a lower price, which brings great economic losses to high-silicon alloy production enterprises. If the silicon slag is deeply processed, the alloys in the slag are sorted out, and then remelted and refined to produce refined ferrosilicon, which can be sold at a price higher than that of ordinary high-silicon alloys. more considerable economic benefits. [0003] CN201710597829.8 discloses a method for separating and extracting silicon from silicon slag. The c...

Claims

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Application Information

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IPC IPC(8): C22C35/00C22B9/16
CPCC22C35/00C22B9/16
Inventor 袁建军牛强邸俊明华永才王东雄
Owner 内蒙古鄂尔多斯电力冶金集团股份有限公司
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