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Comprehensive utilization method for fly ash of non-calcium roasting rotary kiln

A calcium-free roasting and rotary kiln technology, applied in chemical instruments and methods, inorganic chemistry, chromium compounds, etc., can solve problems such as high cost, high energy consumption, and affecting smelting efficiency, and achieve the effect of solving ring formation

Active Publication Date: 2014-07-16
GANSU JINSHI CHEM
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  • Description
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AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for comprehensive utilization of calcium-free roasting rotary kiln fly ash, aiming at solving the problems of high cost, affecting smelting efficiency and high energy consumption in the existing fly ash utilization method

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0018] First, reduce the proportion of soda ash in the batching by 2 percentage points on the original basis, and correspondingly increase the proportion of filler by 2%, and send the fly ash recovered from bag dust removal to the fly ash silo of the batching system through the elevator. Through the computer metering system, according to the ratio of filler: soda ash: chromite: fly ash = 52:23:20:5, the ingredients are evenly mixed. The rotary kiln does not form rings during the roasting process, and the chromium conversion rate does not change much during the production process of the rotary kiln.

Embodiment 2

[0020] First, reduce the proportion of soda ash in the batching by 3 percentage points on the original basis, and correspondingly increase the proportion of filler by 2%, and send the fly ash recovered from bag dust removal to the fly ash silo of the batching system through the elevator. Through the computer metering system, according to the ratio of filler: soda ash: chromite: fly ash = 53:22:20:5, the ingredients are evenly mixed. The rotary kiln does not form rings during the roasting process, and the chromium conversion rate decreases slightly during the production process of the rotary kiln.

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Abstract

The invention provides a comprehensive utilization method for fly ash of a non-calcium roasting rotary kiln. The method comprises the steps of reducing the alkaline adding quantity on the basis of original non-calcium roasting ingredients; mounting an electrostatic pulse bag deduster at the tail of the rotary kiln, and collecting fly ash into a fly ash collecting pool; arranging a hoister on the fly ash collecting pool, collecting fly ash into a bin of a distribution system of the rotary kiln, calculating the reduced alkaline adding quantity and the increased fly ash quality, and regulating the adding quantity of packing on the premise of keeping the total quantity of the original ingredients and the distribution proportion of chromite unchanged; completely producing chromium salt by using the fly ash through a non-calcium roasting rotary kiln process. According to the invention, the alkaline adding quantity is reduced, and then, the fly ash is recycled and added, so that the ringing problem of the rotary kiln is thoroughly solved, the effect of comprehensively utilizing the fly ash is finally achieved, and the comprehensive utilization method is more economic, more environment-friendly and safest.

Description

technical field [0001] The invention belongs to the technical field of chromium salt production, in particular to a method for comprehensive utilization of calcium-free roasting rotary kiln fly ash. Background technique [0002] Fly ash is the material that is trapped by ultra-fine particles through bag dust removal under the action of airflow in the production process of rotary kiln. In order to complete the roasting reaction, the fineness of ferrochrome powder and fillers in calcium-free roasting is generally controlled below 200 mesh, so the proportion of fly ash discharged outside is very large in the production process, generally 5% of the total feeding amount. about. Because the fly ash is an unreacted feed material, the main components are still unreacted chromite, soda ash, and fillers, and the fly ash has already participated in the reaction to form a certain amount of hexavalent chromium, and the direct discharge will not only cause a large loss of resources , an...

Claims

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Application Information

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IPC IPC(8): C01G37/00C01G37/14
Inventor 韩登仑张忠元谢希智武开鹏杨昆山
Owner GANSU JINSHI CHEM
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