Method for controlling parameters of processes of calcifying and roasting vanadium slag during production of vanadium oxide

Abstract

The invention relates to a method for controlling parameters of processes of calcifying and roasting vanadium slag by using a large rotary kiln during production of vanadium oxide, belongs to the field of metallurgy and provides a method for controlling parameters of processes of calcifying and roasting vanadium slag during production of vanadium oxide. According to the method, the large rotary kiln is used for calcifying and roasting the vanadium slag; the control method comprises the following steps: a, firstly adjusting various parameters of the large rotary kiln to reasonable ranges in sequence according to the following sequence of negative pressure, combustion-supporting air flow, oxygen flow, temperature of the rotary kiln and gas flow; and b, finely adjusting the rotary kiln door to control the stability of various parameters in the step a in sequence according to the following sequence of the gas flow, the temperature of the rotary kiln, the combustion-supporting air flow, the oxygen flow and the negative pressure. The method is capable of ensuring the stability of various process parameters; meanwhile, the method can be used for producing black, loose and high-quality roasted clinker with few particles; the roasted clinker is liable to crush; the conversation rate of the acid-leached vanadium can reach up to 85-92%.

Description

technical field [0001] The invention relates to a method for controlling the process parameters of calcification and roasting of vanadium slag in a large-scale rotary kiln in the production of vanadium oxide, belonging to the field of metallurgy. Background technique [0002] At present, the main processes of the clean production method of vanadium oxide are: calcification and roasting of raw materials-sulfuric acid leaching-solid-liquid separation-precipitation of vanadium-calcination deamination or reduction and other processes, for details, refer to the patent application with publication number CN200810305601; in this method, calcification and roasting It is the most critical step. The key point of large-scale rotary kiln process parameter control is the stable temperature control technology. Whether the temperature control is accurate or not and the temperature gradient distribution is reasonable or not determines the quality of the roasting effect and the rate of vanadi...

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Problems solved by technology

[0003] In the prior art, the temperature control method of the large-scale rotary kiln is the closed kiln door. The existing problem is that one-sided attention is paid to the temperature, and the adjustment of the gas flow is emphasized, ignoring the actual situation in the kiln, resulting in large-scale rotary kiln. Parameter stability is poor, the vanadium conversion rate is low when the temperature is low, and the ring material is produced when the temperature is high, and the vanadium conversion rate fluctuates greatly; moreover, there is no sequence restriction on the adjustment of various parameters when the rotary kiln controls the temperature in the prior art. Random adjustment makes the labor intensity of the operator is also relatively high, and there is no special attention to the stability of each parameter; this operation is not conducive to smooth production, which seriously affects the roasting effect, output and vanadium yield in the roasting process

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