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Method for smelting low chromium pig iron by utilizing chromium slag

A technology for chromium slag and pig iron, which is applied to the improvement of process efficiency, blast furnace, furnace type and other directions, can solve the problems of reducing the amount of chromium slag produced, difficult to treat chromium slag, and unsatisfactory effect, etc., and achieves the effect of increasing the source of raw materials

Inactive Publication Date: 2010-11-03
TULUFAN SHENHONG METAL IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the prevention of chromium slag pollution mainly lies in improving the production process, and adopting a calcium-free and low-calcium roasting process to produce chromium salts, so as to greatly reduce the amount of chromium slag produced; but in the prior art, the generation of chromium slag is still inevitable
[0004] The treatment of chromium slag is extremely difficult. Since the 1960s, my country and other countries in the world have been devoting themselves to the study of chromium slag treatment. Although progress has been made, the effect is not satisfactory.

Method used

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  • Method for smelting low chromium pig iron by utilizing chromium slag
  • Method for smelting low chromium pig iron by utilizing chromium slag
  • Method for smelting low chromium pig iron by utilizing chromium slag

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Embodiment Construction

[0033] The present invention is described in detail below in conjunction with embodiment:

[0034] The method of smelting low-chromium pig iron by using chromium slag, mixing chromium slag, iron ore powder, coke powder and lime, adding water to granulate, granulating into small balls with an average particle size of 1.5-8mm; The sintering machine is sintered into sintered ore, and then the sintered ore is sent to the blast furnace for smelting with chromium ore and coke powder to produce low-chromium pig iron. When smelting in the blast furnace, silica is added according to the situation.

[0035] The weight percent of sinter raw materials in each embodiment and the consumption of each raw material during blast furnace smelting:

[0036]

[0037]

[0038] The average weight percentage of main components of chromium slag:

[0039] Cr 2 o 3

CaO

MgO

Fe

al 2 o 3

SiO 2

Cr 6+

13.54％

9.58％

13.10％

26.12％

...

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Abstract

The invention discloses a method for smelting low chromium pig iron by utilizing chromium slag, which is characterized in that low chromium pig iron is prepared by carrying out granulation after mixing the chromium slag, iron ore powder, coke powder and lime, sintering granules by a sintering machine to form sintered ores after granulation, and then sending the sintered ores into a blast furnace to smelt. The invention has the advantages that the chromium slag is adopted as raw materials and smelted to form the low chromium pig iron by utilizing the blast furnace, thereby treating the harmful waste chromium slag, also increasing the raw material source of the low chromium pig iron, providing a new economic and practical raw material source to industries of stainless steel, wear resistance cast and the like and changing waste into valuable.

Description

technical field [0001] The invention relates to a method for smelting low-chromium pig iron by utilizing chromium slag. Background technique [0002] Sodium chromate is one of the important inorganic chemical raw materials and the basic raw material for the production of sodium dichromate, potassium dichromate, chromic anhydride and chrome green. Used in electroplating, tanning, printing and dyeing, medicine, oil refining, catalyst, synthetic rubber, spices and stainless steel manufacturing and other industries. With the development of industrialization in my country and other countries in the world, its demand is increasing. But the production of sodium chromate at present, the one, serious environmental pollution, the 2nd, production efficiency is low, and yield is low, only 75%. Environmental pollution is particularly prominent, and developed countries have transferred this production technology to developing countries one after another. In my country, 3 tons of chromi...

Claims

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Application Information

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IPC IPC(8): C21B5/00C22B1/248C22B1/16
CPCY02P10/20
Inventor 董达关振波吴明程孙久赫戈宝武
Owner TULUFAN SHENHONG METAL IND
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