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A method of comprehensively utilizing calcium-free chromium slag to directly produce chromium-based alloy steel

A technology of calcium-chromium-free slag and alloy steel, applied in the direction of improvement of process efficiency, electric furnace, furnace type, etc., can solve the problem of waste of scarce resources, etc., achieve complete detoxification, significant economic benefits, and solve the effects of new costs

Active Publication Date: 2017-06-09
GANSU JINSHI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If it is not recycled, it will inevitably cause a waste of scarce resources

Method used

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  • A method of comprehensively utilizing calcium-free chromium slag to directly produce chromium-based alloy steel
  • A method of comprehensively utilizing calcium-free chromium slag to directly produce chromium-based alloy steel
  • A method of comprehensively utilizing calcium-free chromium slag to directly produce chromium-based alloy steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The calcium-chromium-free slag and local Dahe coal are used as raw materials, and the slag-forming agent is silica. The chemical composition of Dahe coal is: C70%, Fe 2 O 3 1.29%, MgO0.75%, CaO1.08%, SiO 2 10.65%, Al 2 O 3 4.88%, other ingredients 11.35%. The chemical composition of silica is: SiO 2 90.83%, MgO3.65%, Al 2 O 3 1.28% Fe 2 O 3 0.86%, other ingredients 3.38%. The electric furnace used in this example is a 630kVA DC submerged arc furnace with a capacity of 1.3 tons, a furnace body diameter of 1.8m, a height of H1.5m, an effective inner diameter of 0.95m, and an effective height of 0.92m. It is made of carbon brick and magnesia brick composite masonry. The electric furnace is powered by two electrodes. The specific steps are carried out in the following order:

[0049] 1. First, add 200kg of Dahe coal to 1000kg of calcium-chromium-free slag, and mix the mixed raw materials with a mixer.

[0050] 2. Using a pelletizing machine, press the mixture ...

Embodiment 2

[0057] The raw materials are calcium-free chromium slag and local Dahe coal, and the slagging agent is silica. Among them, the chemical composition of Dahe coal is: C70%, Fe 2 o 3 1.29%, MgO0.75%, CaO1.08%, SiO 2 10.65%, Al 2 o 3 4.88%, other ingredients 11.35%. The chemical composition of silica is: SiO 2 90.83%, MgO3.65%, Al 2 o 3 1.28%, Fe 2 o 3 0.86%, other ingredients 3.38%. The electric furnace used in this example is a 630kVA DC submerged arc furnace with a capacity of 1.3 tons, a furnace body diameter of φ1.8m, a height of H1.5m, an effective inner diameter of φ0.95m, and an effective height of 0.92m. Composite masonry with carbon bricks and magnesia bricks. The electric furnace adopts double electrode power supply. The specific steps are carried out in the following order:

[0058] 1. First add 200kg of Dahe coal to 1000kg of calcium-free chromium slag, and mix the mixed raw materials with a mixer.

[0059] 2. Use a ball forming machine to press the mixt...

Embodiment 3

[0067] The raw materials are calcium-free chromium slag and local Dahe coal, and the slagging agent is silica. Among them, the chemical composition of Dahe coal is: C70%, Fe 2 o 3 1.29%, MgO0.75%, CaO1.08%, SiO 2 10.65%, Al 2 o 3 4.88%, other ingredients 11.35%. The chemical composition of silica is: SiO 2 90.83%, MgO3.65%, Al 2 o 3 1.28%, Fe 2 o 3 0.86%, other ingredients 3.38%. The electric furnace used in this example is a 630kVA DC submerged arc furnace with a capacity of 1.3 tons, a furnace body diameter of φ1.8m, a height of H1.5m, an effective inner diameter of φ0.95m, and an effective height of 0.92m. Composite masonry with carbon bricks and magnesia bricks. The electric furnace adopts double electrode power supply. The specific steps are carried out in the following order:

[0068] 1. First add 230kg of Dahe coal to 1000kg of calcium-free chromium slag, and mix the mixed raw materials with a mixer.

[0069] 2. Use a ball forming machine to press the mixt...

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Abstract

The invention discloses a method for directly producing chrome-base alloy steel by comprehensively using calcium-free chrome slag, which is implemented by the steps of weighing, material preparation, reduction smelting, slag discharge, iron discharge, refining pouring and the like. The chrome-base alloy steel is prepared by the following steps of: adding a reducing agent into the calcium-free chrome slag; smelting the calcium-free chrome slag in a smelting furnace; and directly introducing the molten chrome and iron into a refining furnace to perform oxygen blowing decarburization refining. The chrome-base alloy steel comprises the following main components: 0.2 to 6.0 percent of carbon (C), 8.0 to 50.0 percent of chromium (Cr), 0.3 to 1.0 percent of silicon (Si), less than or equal to 0.05 percent of sulphur (S), less than or equal to 0.05 percent of phosphorus (P) and 0.1 to 0.5 percent of vanadium (V). The alloy steel can be directly used for manufacturing or forging various wear resistant materials, such as cement, wear resistant steel balls for power and mineral separation, forging steel or liners and the like. In the method, the chrome-base alloy steel product is directly produced by using the calcium-free chrome slag as a raw material, so that the calcium-free chrome slag is completely detoxified and the limited chrome resource is recycled. Thus, the method has a great significance for clean chrome salt production and waste slag recycling.

Description

technical field [0001] The invention relates to the treatment and resource utilization of solid waste, in particular to a method for comprehensively utilizing calcium-free chromium slag to directly produce chromium-based alloy steel. Background technique [0002] Calcium-free chrome slag is an industrial waste slag discharged during the production of chromium salts using the most advanced calcium-free roasting technology, because it contains a small amount of hexavalent chromium (Cr) soluble in water. 6+ ), is a serious pollution source and is a hazardous waste residue. [0003] The main chemical components of chromium slag discharged in the process of producing chromium salt by calcium-free roasting process [0004] Element Al 2 O 3 MgO SiO 2 CaO Fe 2 O 3 Na 2 O Cr 6+ V Cr 2 o 3 content% 11～14.5 18～23 7.5～9.8 0～1.2 28～32 4.0～5.5 0～0.5 0.2～0.5 7～11 [0005] The traditional methods of detoxification of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B13/12C21C7/068C22C38/24
CPCY02P10/20
Inventor 何喜善宋春林宋平儒武开鹏李元魁
Owner GANSU JINSHI CHEM
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