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Method for smelting chromium-containing cast iron by using vanadium-containing calcium slag

A calcium slag, vanadium-chromium technology, applied in the field of chromium salts, can solve the problems of vanadium resource utilization, difficulty in separation of slag and iron, hexavalent chromium pollution of vanadium-containing calcium slag, etc., and achieve the effect of improving quality

Active Publication Date: 2012-11-07
GANSU JINSHI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for smelting vanadium-containing chromium alloys with vanadium-containing calcium slag, so as to solve the problems of high melting point and difficult separation of slag and iron in the existing calcium-free chromium slag smelting chromium-containing cast iron. The hexavalent chromium pollution of vanadium-containing calcium slag and the utilization of vanadium resources

Method used

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  • Method for smelting chromium-containing cast iron by using vanadium-containing calcium slag
  • Method for smelting chromium-containing cast iron by using vanadium-containing calcium slag
  • Method for smelting chromium-containing cast iron by using vanadium-containing calcium slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] This example is based on the production statistical data of the 3500KVA electric arc furnace. The furnace material capacity of the 3500KVA electric arc furnace is 10 tons, the diameter of the furnace shell is 5200mm, the height is 3300mm, the diameter of the furnace is 3600mm, and the height is 1600mm; Way. The main chemical components of the raw materials used are calcium-free chromium slag, Xinjiang coal, silica, and vanadium-containing calcium slag as shown in Table 1:

[0022]

[0023] Specific steps are as follows:

[0024] 1. Add 600Kg of vanadium-containing calcium slag to 5000Kg of calcium-free chromium slag, 818Kg of Xinjiang coal with a diameter of 1-3mm, and 240Kg of silica less than 1mm, and mix evenly with a mixer.

[0025] 2. The raw materials that have been uniformly mixed by the mixer are then mixed again by tubular biaxial agitation, and 466Kg water is evenly sprayed on the 6658Kg ingredients at the biaxial agitation outlet to form particles with a ...

Embodiment 2

[0031] This example is based on the production statistical data of the 3500KVA electric arc furnace. The furnace material capacity of the 3500KVA electric arc furnace is 10 tons, the diameter of the furnace shell is 5200mm, the height is 3300mm, the diameter of the furnace is 3600mm, and the height is 1600mm; Way. The raw materials used are calcium-free chromium slag, coke, silica, and vanadium-containing calcium slag. The main chemical components are as follows:

[0032]

[0033] Specific steps are as follows:

[0034] 1. Add 907Kg of vanadium-containing calcium slag, 943Kg of coke with a diameter of 1-3mm, and 239Kg of silica less than 1mm into 5289Kg of calcium-free chromium slag, and mix them evenly with a mixer.

[0035] 2. The raw materials mixed uniformly by the mixer are mixed again by tubular biaxial agitation, and 827Kg water is evenly sprayed on the 7378Kg ingredients at the biaxial agitation outlet to form particles with a diameter of 20mm on the ball formi...

Embodiment 3

[0042] This example is based on the production statistical data of the 3500KVA electric arc furnace. The furnace material capacity of the 3500KVA electric arc furnace is 10 tons, the diameter of the furnace shell is 5200mm, the height is 3300mm, the diameter of the furnace is 3600mm, and the height is 1600mm; Way. The raw materials used are calcium-free chromium slag, semi-coke, silica, and vanadium-containing calcium slag. The main chemical components are as follows:

[0043]

[0044] Specific steps are as follows:

[0045] 1. Add 540Kg of vanadium-containing calcium slag to 6000Kg of calcium-free chromium slag, 972Kg of blue charcoal with a diameter of 1-3mm, and 337Kg of silica less than 1mm, and mix evenly with a mixer.

[0046] 2. The raw materials that have been uniformly mixed by the mixer are mixed again by tubular biaxial agitation, and 1000Kg water is evenly sprayed on the 8740Kg ingredients at the biaxial agitation outlet to form particles with a diameter of ...

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Abstract

The invention aims to provide a method for smelting chromium-containing cast iron by using vanadium-containing calcium slag for solving the problems of high melting point and difficult slag iron separation in the conventional smelting of chromium-containing cast iron by calcium-free vanadium slag and the problems of hexavalent chromium pollution to vanadium-containing calcium slag and utilization of vanadium-containing resources. The method has the characteristics that: the vanadium-containing calcium slag discharged from a process for preparing sodium bichromate by calcium-free roasting is used as an additive and is uniformly mixed with calcium-free chromium slag, silica and a carbon reducer; the mixture is granulated, dried, and smelting in an arc furnace; and thus, vanadium and chromium alloy cast iron is obtained. In the invention, the alkalinity of the furnace slag is kept between 1.4 and 1.8, the melting point of the smelted furnace slag can be reduced to 1,450 to 1,600 DEG C, the weight ratio of the furnace slag to molten iron is (3.7-4.5):1, reduction is performed completely in the melting and smelting of calcium-free chromium slag, the slag and iron separation is complete, the phenomenon that furnace slag is mixed in finished vanadium and chromium alloy cast iron is eliminated, and the quality of the vanadium and chromium alloy cast iron is improved.

Description

technical field [0001] The invention belongs to the field of chromium salts, and specifically relates to a method for smelting vanadium-chromium-containing alloys in calcium-free chromium slag by using chromium salt waste waste containing vanadium-calcium slag. Background technique [0002] Calcium-free chromium slag and vanadium-containing calcium slag are industrial wastes discharged during the production of chromium salts by calcium-free roasting technology. Calcium-free chromium slag contains 0.2-0.5% water-soluble hexavalent chromium, and vanadium-containing calcium slag contains 9-13%. The water-soluble hexavalent chromium is a hazardous waste that pollutes the environment. [0003] In the existing process of electric arc furnace smelting using calcium-free chromium slag, carbon reducing agent, and silica as raw materials, the melting point of slag is 1650-1780°C, and the weight ratio of slag to molten iron is 3.5-4:1, resulting in calcium-free chromium slag melting an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B4/06C22C33/08
Inventor 张忠元宋春林武平毛雪芹李德锦
Owner GANSU JINSHI CHEM
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