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A kind of method of chromite ore agglomeration

A technology for chromite and agglomeration, which is applied in the field of chromite pretreatment, can solve the problems of low product strength, great difficulty in agglomeration and high roasting temperature, and achieves the effects of high product strength, reduced oxidation difficulty and low roasting temperature

Active Publication Date: 2020-08-11
CITIC HEAVY INDUSTRIES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a method for agglomerating chromite ore to solve the problems of high roasting temperature, low product strength, and difficulty in agglomerating existing in existing chromite agglomerating methods

Method used

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  • A kind of method of chromite ore agglomeration
  • A kind of method of chromite ore agglomeration

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Mix chromite A and chromite B according to the mass ratio of 5:5 to obtain mixed ore 1, and the Cr of mixed ore 1 2 o 3 The mass percentage is 40.18%, and the chromium-iron ratio Cr / Fe is 1.70; the mixed ore 1 is dried to a water content of 2%, and 2% bentonite is added according to the weight percentage to obtain the batch; the batch is finely ground by a dry ball mill Surface area is 1600cm 2 / g of fine powder; add water to the fine powder to a water content of 6%, mix well and make pellets to obtain green pellets; preheat and roast the green pellets after drying, at a preheating temperature of 1050°C, preheat Under the conditions of 8 minutes, 1200°C calcination temperature and 15 minutes calcination time, the compressive strength of chromite oxide pellets can reach 2060N / piece.

Embodiment 2

[0033] Mix chromite A and chromite B according to the mass ratio of 6:4 to obtain mixed ore 2, and the Cr of mixed ore 2 2 o 3 The mass percentage is 40.64%, and the chromium-iron ratio Cr / Fe is 1.62; the mixed ore 2 is dried to a water content of 1.5%, and 1.5% bentonite is added according to the weight percentage to obtain the batch material; the batch material is finely ground by a dry ball mill into a ratio Surface area is 1700cm 2 / g of fine powder; add water to the fine powder to a water content of 7%, mix well and make pellets to obtain green pellets; preheat and roast the green pellets after drying, at a preheating temperature of 1075°C, preheating time Under the conditions of 9min, 1225°C roasting temperature and 15min roasting time, the compressive strength of chromite oxide pellets can reach 2350N / piece.

Embodiment 3

[0035] Mix chromite A and chromite B according to the mass ratio of 7:3 to obtain mixed ore 3, and the Cr of mixed ore 3 2 o 3 The mass percentage is 41.11%, and the chromium-iron ratio Cr / Fe is 1.55; the mixed ore 3 is dried to a water content of 1.5%, and 1.0% bentonite is added according to the weight percentage to obtain the batch; the batch is finely ground by a dry ball mill Surface area is 1800cm 2 / g of fine powder; add water to the fine powder to a water content of 9%, mix well and make pellets to obtain green pellets; preheat and roast the green pellets after drying, at a preheating temperature of 1100°C, preheating time Under the conditions of 10min, 1250℃ roasting temperature and 20min roasting time, the compressive strength of chromite oxide pellets can reach 2810N / piece.

[0036] The main chemical composition of chromite in embodiment 1~3 is shown in Table 1:

[0037] Table 1 Main chemical composition of raw materials / %

[0038]

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Abstract

The invention provides a chromite briquetting method. The chromite briquetting method comprises the steps that two or more types of chromite are blended in proportion to obtain mixed ore; the mixed ore is dried till the water content of the mixed ore is not higher than 2%, and 1%-2% of bentonite by weight is added to the mixed ore, so that a mixture is obtained; the mixture is ground into fine powder with the specific area of 1500-1900 cm<2> / g through a dry ball mill; water is added to the fine powder till the water content of the fine powder reaches 6%-9%, the water and the fine powder are sufficiently mixed, and then pelletizing is conducted to obtain green pellets; and the green pellets are dried, preheated and roasted, so that oxidized chromite pellets are obtained. The chromite briquetting method has the beneficial effects that when the chromite briquetting method is used for chromite briquetting, the roasting temperature is low, the product strength is high, and the chromite briquetting difficulty is lowered; and the chromite briquetting method is suitable for large-scale industrial application and has broad application prospects.

Description

technical field [0001] The invention belongs to the technical field of chromite pretreatment, and in particular relates to a method for agglomerating chromite ore. Background technique [0002] In the metallurgical industry, chromite is the main raw material for smelting ferrochrome alloys. Ferrochromium alloy is mainly used for alloying in the steelmaking process, which can increase the hardness, toughness, ductility, heat resistance, wear resistance and corrosion resistance of steel, thereby producing a variety of high strength, corrosion resistance, wear resistance, and corrosion resistance. High-temperature, oxidation-resistant special steel; and metal chromium can also be used to smelt special alloys with cobalt, nickel, tungsten and other elements. These special steels and special alloys are indispensable materials for aviation, aerospace, automobiles, shipbuilding, and defense industries to produce guns, missiles, rockets, ships, etc. [0003] At present, the main r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/243
CPCC22B1/2406C22B1/243
Inventor 张树辉张平师华东王新博代伟林朱成章罗立章谢彦君苏华伟王艳梅刘维涛秦昱锋许勇
Owner CITIC HEAVY INDUSTRIES CO LTD
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