Preparation method of ferrochrome and crucible applied to method

A ferrochrome alloy and crucible technology, which is applied in the field of high-carbon ferrochrome production, can solve the problems of high requirements for crucibles and difficult separation of furnace materials, and achieve the effects of energy saving and temperature reduction

Active Publication Date: 2018-02-23
陕西盛华冶化有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the technical problems of high requirements on the crucible in the existing method for smelting ferrochrome by microwave heating, and the difficulty in detaching the charge from the crucible after the smelting is completed, one of the purposes of the present invention is to provide a method for preparing chromite by using microwave reduction. Another object of the present invention is to provide a crucible that can be easily demolded after smelting

Method used

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  • Preparation method of ferrochrome and crucible applied to method
  • Preparation method of ferrochrome and crucible applied to method
  • Preparation method of ferrochrome and crucible applied to method

Examples

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Embodiment 1

[0032] Example 1: 1960 g of chromite powder, 510 g of blue carbon powder, and 430 g of silica powder. After mixing, press water to form pellets with a diameter of 30 mm and dry them at 105°C. Spread 50 mm quartz sand + 10 mm graphite powder in a refractory crucible. Lay the dried material ball on the graphite powder layer; send it into 20KW microwave rate and heat for 140min to obtain 1032g alloy, in which Cr: 57.12%, Si1.37%, C7.5%, Cr recovery rate 85.3%.

Embodiment 2

[0033] Example 2: 2162g of chromite powder, 562g of blue charcoal powder, and 476g of silica powder. After mixing, press water to form a ball with a diameter of 50mm and dry at 105°C; spread 50mm quartz sand + 10mm graphite powder in a refractory crucible. Lay the dried material ball on the graphite powder layer; send it into 20KW microwave rate and heat for 150min to obtain 1178g alloy, in which Cr: 57.26%, Si1.43%, C8.1%, Cr recovery rate 88.5%.

Embodiment 3

[0034] Example 3: 1554 g of chromite powder, 404 g of blue carbon powder, and 342 g of silica powder were mixed and mixed and pressed into pellets with a diameter of 30 mm and dried at 105°C; the refractory crucible was spread with 50 mm quartz sand + 10 mm graphite powder. Lay the dried material ball on the graphite powder layer; send 20KW microwave rate and heat for 120min to obtain 893g alloy, in which Cr: 55.52%, Si1.13%, C6.9%, Cr recovery rate is 92.1%.

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Abstract

The invention relates to a preparation method of ferrochrome and a crucible applied to the method. To achieve the purpose that ferrochrome is smelted through microwave heating and meanwhile solve thetechnical problem that the requirement for the crucible is relatively high in a method for smelting the ferrochrome through microwave heating, the preparation method comprises the following steps thatmaterials are prepared, furnace burden comprises ferrochrome mineral powder, a reducing agent and an auxiliary material, and the furnace burden comprises, by weight percent, 65%-70% of the ferrochrome mineral powder, 15%-20% of the reducing agent and 13%-18% of the auxiliary material; secondly, ball making is carried out, wherein the material powder of the furnace burden is mixed to be uniform according to the proportion, water is added, the furnace burden is pressed into balls, and the balls are dried; thirdly, the material balls are laid on the crucible, the thickness does not exceed 150 mm, and then the crucible is put into a microwave oven to be heated; and fourthly, the heated furnace burden is taken out and subjected to water cooling, jaw crushing and gravity separation, and ferrochrome particles are obtained. The Cr content of the high-carbon ferrochrome reduced through the method ranges from 55%-60%, the recovery rate of the Cr ranges from 85%-92%, the indexes are equivalent to the indexes of a traditional submerged arc furnace product, the power consumption and the dust pollution are reduced, and the furnace burden demolding problem of microwave metallurgy is economicallysolved.

Description

Technical field [0001] The present invention relates to a process for producing high-carbon ferrochrome, in particular to a method for obtaining high-carbon ferrochrome by reducing chromite by microwave and a crucible used in the method. technical background [0002] High-carbon ferrochrome alloys are mainly used as steelmaking additives to produce various special steels such as stainless steel, tool steel, spring steel, ball bearing steel, acid-resistant steel, heat-resistant steel, etc., to improve the high temperature resistance, oxidation resistance, corrosion resistance of steel Wear-resistant, high-strength performance. At present, ferrochromium alloys are mainly produced by submerged arc furnaces, which belong to industries with high energy consumption and high pollution. With the continuous upgrading of national environmental protection requirements and the increasingly strict carbon emission quota system, the submerged arc furnace smelting ferrochrome process will gradu...

Claims

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Application Information

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IPC IPC(8): C22B34/32C22B5/10C22C35/00
CPCC22B5/10C22B34/32C22C35/00
Inventor 魏新华魏云松李兴波张炜杨惠高琦王宝安
Owner 陕西盛华冶化有限公司
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