New acid preparing process with pyrite ore

A technology of pyrite and new technology, which is applied in pyrite roasting to produce acid and slag selection of iron ore, can solve the problems of non-compliance with free selection rules, lack of promotion and application, difficulty of slag beneficiation, etc., and achieve The effect of reducing roasting phenomenon, increasing unit yield, and reducing conversion

Inactive Publication Date: 2006-05-17
赵位
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  • Application Information

AI Technical Summary

Problems solved by technology

Its main processes include crushing pretreatment of pyrite raw materials, high temperature roasting, SO 2 Steps such as gas purification conversion and absorption, in which the temperature of high-temperature roasting is 880-920°C, but when the temperature exceeds 900°C, the reaction between silicon dioxide and iron-containing compounds is very easy to form iron silicate, and at the same time, the high roasting temperature requires Increase roasting time to guarantee, this causes peroxidation roasting again, and the triiron tetroxide Fe in slag 3 o 4 Most of the components are reduced to iron oxide Fe 2 o 3 And ferrous oxide FeO, after the roasted slag is discharged from the bottom of the furnace, the main manifestations of iron are ferrous oxide, iron oxide and ferric silicate, which brings certain difficulties to the beneficiation of slag
[0004] At present, domestic processing of slag beneficiation mostly adopts reprocessing technology, and the required cost does not match the benefits generated by the current use of this resource in my country, and obviously does not conform to the free choice rules under the market economy, so it cannot be promoted and applied. It is necessary to start from the premise of low cost consumption to obtain the maximum benefit utilization of pyrite acid production slag

Method used

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  • New acid preparing process with pyrite ore
  • New acid preparing process with pyrite ore
  • New acid preparing process with pyrite ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1 Low-temperature roasting pyrite desulfurization test

[0019] The pyrite acid production process uses a small roasting furnace as the experimental device. The diameter of the roasting furnace is 0.36m and the height is 0.8m. Thermocouples are used as temperature measuring devices. The feeding amount is measured by an electronic scale. Can be adjusted manually. A square reduction chamber is built below the roasting chamber, and the reduction chamber specification is (length) 30cm×(width) 30cm×(height) 50cm.

[0020] The pyrite ore from Jianchang, Liaoning Province was selected as the raw material for acid production. The massive pyrite was crushed and mixed with powdered pyrite in equal parts and sieved. The maximum particle size of the sieved was less than 3mm, and the detected sulfur grade was 28%. Moisture 6%.

[0021] Adopt the roasting process provided by the present invention to roast pyrite to produce acid, and detect the oxidation rate of sulfur an...

Embodiment 2

[0031] Embodiment 2 Slag reduction test

[0032] The roasting equipment and pyrite raw materials used are the same as in Example 1, and the slag of Example 1 is reduced through the reduction chamber provided under the roasting chamber, and the reduction temperature is controlled within the range of 550-570°C. And adopt different reducing agent to carry out reduction experiment:

[0033] 1. Water gas is used as reducing agent to obtain slag sample 6. After testing, the iron grade in slag sample 6 is 48%, and the effective reduction component content of water gas is: CO 37%, H 2 50%. The throughput is 8.67 cubic meters per hour.

[0034] 2. Using blast furnace gas as a reducing agent to obtain cinder sample 7, the iron grade in cinder sample 7 was detected to be 48%, and the effective reducing component content of blast furnace gas was: CO 25.37%, H 2 2.11%. The throughput is 299.1 cubic meters per hour.

[0035]3. Using mixed gas as reducing agent to obtain cinder sample ...

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Abstract

The new acid preparing process with pyrite ore belongs to the technology field of roasting pyrite ore to prepare acid and sorting slag to obtain iron ore. The acid preparing process includes the steps of treating material and roasting at 750-800 deg.c, and features the reduction of the desulfurized and roasted slag with reductant at 550-570 deg.c. The process can convert the iron in the slag into ferric-ferrous oxide capable of being magnetically separated. The present invention results in raised resource utilization rate.

Description

technical field [0001] The invention belongs to the technical field of pyrite roasting for acid production and slag extraction of iron ore, and in particular relates to an acid production process capable of improving the efficiency of iron ore extraction in slag. Background technique [0002] The production of sulfuric acid from pyrite is a traditional method of making acid. my country is rich in pyrite resources, so our country is still mainly using pyrite to make acid. At present, my country produces more than 7 million tons of sulfuric acid every year, of which more than 5 million tons of sulfuric acid are produced from pyrite, and the slag produced after acid production is as high as more than 5 million tons every year. Although the grade of iron in most of the slag is as high as 35-50%, because the pyrite acid production process has been used decades ago, most of the iron in the slag is iron oxide Fe 2 o 3 , ferrous oxide FeO and ferric silicate, only a very small par...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/69
Inventor 赵恩举
Owner 赵位
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