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Method for producing molten alloy steel from rock wool melt by oxidation of silicon

A co-production of alloy steel and silicon oxidation technology, applied in the field of iron and steel smelting, can solve the problems of low recovery rate of silicon powder, no mention of energy saving, high cost, etc., and achieve the effect of increasing benefits

Active Publication Date: 2017-04-05
杭州吉幔铁氢能科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent 200610058746.3 (Zhang Jieping) and Chinese patent 200810232782.6 (Xi Xifeng) recovered polyethylene glycol (PEG) and silicon carbide (SiC) through processing, but did not involve the recovery and utilization of silicon powder
[0008] The technical scheme announced in Chinese patent 200610029378.X (Jinbalin) has carried out the recovery of silicon powder, and the recovery rate of silicon powder is low, only 1-2% of the slurry
Chinese patent CN01135221.3 proposes to use coal gangue to produce mineral fiber. It seems that the raw material itself can provide part of the heat required for melting, but still requires a large amount of heat energy from the outside to melt
[0024] Chinese patent ZL88108024 proposes to use hot-melt yellow phosphorus slag to directly produce mineral wool fiber, but its acidity coefficient is less than 1, and the obtained mineral wool fiber cannot compare with rock wool fiber
[0025] Chinese patent CN200780034126 proposes a mineral wool composition, which has a relatively high acidity coefficient and can produce high-quality rock wool fibers, but does not propose a more energy-saving method for producing melts
[0026] Chinese patent CN200480024490.3 proposes a glass fiber that can be degraded in physiological fluid, the purpose is to reduce the risk of harm to the human body, but it does not mention how to achieve energy saving in the melting process
[0032] 1. After the separation and extraction of polysilicon cutting waste slurry, polyethylene glycol (PEG) and silicon carbide (SiC) have been well recycled in the industry, but fine Si powder mixed with SiC and other impurities has not been effectively utilized ;
[0033] 2. Even if the Si powder mixed with SiC is purified, it is often necessary to remove the SiC. Since the proportion of SiC in the Si powder fluctuates widely, it means that a large amount of SiC is wasted;
[0034] 3. When the existing rock wool fiber is prepared from rock wool melt, in order to obtain rock wool fiber with high quality and high acidity value, natural basalt and other SiO2 2 Minerals with high content are melted by inputting a large amount of heat energy, which consumes a lot of heat and costs a lot;
[0035] 4. If hot slag from high temperature industries such as metallurgy and chemical industry is used as melt to prepare insulation fibers, the acidity value of the hot slag itself is too low to prepare high-quality rock wool fiber

Method used

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  • Method for producing molten alloy steel from rock wool melt by oxidation of silicon
  • Method for producing molten alloy steel from rock wool melt by oxidation of silicon
  • Method for producing molten alloy steel from rock wool melt by oxidation of silicon

Examples

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Embodiment 1

[0074] In this embodiment, the waste silicon material mixed with SiC is used to obtain a high-acidity rock wool melt and co-produce molten iron. process such as figure 2 As shown, the technical scheme and principle are as follows image 3 As shown, the specific process steps are as follows:

[0075] A. Dissolved silicon in iron bath

[0076] Take 2000kg of dried waste silicon mixed with SiC, which contains 58% Si, 40% SiC and the rest is iron, and put it in the waste silicon feeding tank 102 .

[0077] The iron bath melting furnace 101 contains 20 tons of melted iron at a temperature of 1600°C. Open the nitrogen supply device 110, use nitrogen gas as the carrier gas to blow the waste silicon material into the iron bath melting furnace 101, the combination reaction of silicon powder and iron occurs, and heat is released, and the reaction is easy and fast, as Formulas (2), (3) shown.

[0078] Fe+Si=FeSi (2)

[0079] ΔG Θ =-80332-4.18*T(J) (3)

[0080] When the silicon co...

Embodiment 2

[0103] In this embodiment, the waste silicon material mixed with SiC is used to obtain a high-acidity rock wool melt, and at the same time, a chromium-containing stainless steel mother liquor is co-produced. process such as Figure 4 As shown, the technical scheme and principle are shown in (a) and (b) of Figure 5, and the specific process steps are as follows:

[0104] A. Dissolved silicon in iron bath

[0105] It is exactly the same as Example 1: 2000 kg of waste silicon material mixed with SiC is dissolved in 20 tons of molten iron to obtain a low-silicon ferrosilicon solution with a silicon content of 7.8% and a carbon content of 1.2%.

[0106] B. Oxidation into slag, mixed with chromium smelting reduction slag to make rock wool melt

[0107] Prepare 6.5 tons of iron concentrate powder and iron oxide scale containing 60% iron as an oxidizing agent, and prepare 3.6 tons of hot chromium smelting reduction slag 317 in the C step as an additive, in (a) and (b) of Fig. 5 ) a...

Embodiment 3

[0122] In this example, the waste silicon material mixed with SiC is used as a reducing agent to firstly apply the Pidgeon method to smelt magnesium, and then dissolved in molten iron to oxidize to obtain a rock wool melt with high acidity and co-produce chromium. Stainless steel mother liquor. process such as Figure 7 As shown, the technical scheme and principle are shown in (a) and (b) of Figure 8, and the specific process steps are as follows:

[0123] A. Pidgeon process for magnesium smelting

[0124] Grind the calcined dolomite to 300 mesh and fully mix it with the waste silicon material. The proportion of waste silicon material and calcined dolomite is prepared according to the ratio of 20:80, and a small amount of fluorite powder is added as an additive. Mix well and make balls, and send them into the Pidgeon method vacuum silicon thermal reduction magnesium smelting reduction tank 401 for vacuum magnesium smelting reaction. The temperature is 1200°C and the pressur...

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Abstract

The invention discloses a method for preparing rock wool melt through silicon oxidation and coproducing molten alloy steel, belonging to the technical fields of utilization of waste crystal silicon slurry, preparation of rock wool fiber melt and smelting of iron and steel. In the method, a silicon material mixed with silicon carbide is dissolved in the molten iron, an oxidizing agent and a substance at least containing calcium oxide are added, silicon is oxidized into silicon dioxide, the silicon dioxide and the added substance at least containing calcium oxide form liquid slag, the liquid slag is used as rock wool melt for preparing rock wool fiber, the oxidizing agent at least comprises an oxide, the iron oxide is reduced, and thus, liquid metal iron is obtained as a byproduct. According to the method, a silicon material in waste silicon as well as silicon element and carbon element in silicon carbide are used for preparing high-acidity rock wool melt for rock wool fiber, a chemical reducing agent effect and chemical calorific effect of the silicon material as well as the silicon and the carbon in the silicon carbide are fully used, energy consumption is reduced, molten metal, alloy steel mother liquor and stainless steel mother liquor with higher additional value are directly obtained from the metal oxide raw material as coproduced byproducts, and the comprehensive benefits are notable.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of silicon and silicon carbide in silicon cutting waste slurry, also belongs to the technical field of preparing rock wool fiber insulation materials by using metallurgical hot slag, and also belongs to the technical field of iron and steel smelting, and particularly relates to the preparation of rock wool melt A method for joint production of molten alloy steel. Background technique [0002] In order to obtain thin sheet products used in solar cell substrates, integrated circuit substrates, electronic chips, and precision semiconductor chips, high-purity monocrystalline silicon, polycrystalline silicon rods, and ingots need to be wire-cut. Wire cutting uses silicon carbide with high hardness as the abrasive, which is added to a water-soluble suspension with polyethylene glycol (PEG) as the main raw material in a certain proportion to form a water-based cutting fluid. Among them,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03B37/00C21C7/00
Inventor 牛强
Owner 杭州吉幔铁氢能科技有限公司