Comprehensive utilization method of converting chromium slag totally into light magnesium carbonate and fine iron breeze

A technology of light magnesium carbonate and iron concentrate powder is applied in the directions of magnesium carbonate, process efficiency improvement, solid waste removal, etc. Economic and social benefits, less corrosion of equipment, and convenient industrial implementation

Inactive Publication Date: 2003-04-16
INST OF PROCESS ENG CHINESE ACAD OF SCI
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Problems solved by technology

This method consumes a large amount of cement, consumes a lot of power, and has poor economic benefits.
Due to the traditional process itself, that is, the large amount of chromium slag, the high chromium content in the slag, and the complex composition of chromium slag, the cost of chromium slag treatment is too high and it is difficult to implement industrially

Method used

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  • Comprehensive utilization method of converting chromium slag totally into light magnesium carbonate and fine iron breeze
  • Comprehensive utilization method of converting chromium slag totally into light magnesium carbonate and fine iron breeze

Examples

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Embodiment 1

[0046] according to figure 1 The process flow is a method for preparing iron concentrate powder and light magnesium carbonate by using ferrous sulfate wet detoxification chromium slag. First take by weighing 200g of chromium slag (composition is shown in Table 1, liquid-solid ratio 1: 1) produced by Chinese patent 98100556, invention title "Clean Production Method of Sodium Chromate", 1500ml of tap water and 10g of commercially available ferrous sulfate are mixed and added Into a 2L autoclave, heat up to 40°C and feed CO 2 to CO 2 Partial pressure is 5Kg / cm 2 , stirred and reacted at a speed of 150 rpm for 1 hour, vacuum filtered the reacted slurry to obtain iron concentrate filter cake and heavy magnesium water. The iron concentrate filter cake was dried at 120°C for 1 hour to obtain 75g of iron concentrate, of which Fe 2 o 3 The MgO content is 54.3%, and the MgO content is 3.6%. The composition is shown in Table 2. Heavy magnesium water is heated to 100°C to decompose,...

Embodiment 2

[0051] according to figure 2 The process flow shown is a method for preparing iron ore concentrate powder and light magnesium carbonate by wet detoxification of chromium slag with lead nitrate. First, take 200g of chromium slag (composition is shown in Table 1, liquid-solid ratio 1:1) produced by Chinese patent 98100556, invention title "Clean Production Method of Sodium Chromate", add 1500ml of tap water to a 2L autoclave after mixing , heated up to 40°C, and CO 2 to CO 2 Partial pressure is 5Kg / cm 2 , stirred and reacted at a speed of 150rpm for 1 hour, vacuum filtered the reacted slurry to obtain iron concentrate filter cake and heavy magnesium water; iron concentrate filter cake was dried at 120°C for 1 hour to obtain 70g of iron concentrate , where Fe 2 o 3 The content is 51.2%, and the MgO content is 3.8%; then weigh 5gPb(NO 3 ) 2 Dubbed into 100ml aqueous solution, Pb(NO 3 ) 2 The solution was added to the above heavy magnesium water, stirred and reacted at a ...

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Abstract

A process for converting all the chromium slags to light-wt. magnesium carbonate and powdered iron ore concentrate includes such steps as proportionally mixing Cr-slag with water, adding FeSO4.7H2O, reaction at 15-50 deg.C for 5-30 min, carbonizing at 15-50 deg.c for 0.5-4 hr in a high-pressure reactor by introducing CO2 while stirring, press-filtering to obtain cake of iron ore concentrate and aqueous solution of magnesium hydrogen carbonate, drying the cake at 100-200 deg.C for 1-4 hr, pulverizing to obtain the powdered iron core concentrate, thermolyzing the said aqueous solution at 95-105deg.C for 10-60 min by introducing steam, washing, drying and pulverizing to obtain light-wt. magnesium carbonate.

Description

technical field [0001] The invention belongs to the treatment and comprehensive utilization technology of chromium slag, and particularly relates to a comprehensive utilization method for converting all chromium slag into light magnesium carbonate products and iron concentrate powder products. Background technique [0002] The chromium salt industry is an important branch of the inorganic salt industry and an indispensable chemical raw material industry for the national economy. The large amount of chromium slag discharged from the traditional chromium salt industry has caused serious pollution to the environment, which largely restricts the development of the chromium salt industry. At present, there are about 3 million tons of chromium slag accumulated in our country, and it is still increasing at a rate of 200,000 tons per year, resulting in a great waste of resources and serious pollution of the environment. At present, the treatment methods fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00C01F5/24C22B3/04
CPCY02P10/20
Inventor 王万平张懿李佐虎齐涛
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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