High-efficiency roasting shaft kiln for stone coal

Abstract

The invention discloses a high-efficiency roasting shaft kiln for stone coal and aims at overcoming the defects that a flat kiln and a rotary kiln adopted in the prior art for extracting vanadium by roasting the stone coal are low in degree of automation, high in operation cost, high in dust content and serious in pollution, air distribution in a shaft kiln cannot completely meet the requirement of intermediate temperature spontaneous combustion of the stone coal and the like. According to the high-efficiency roasting shaft kiln disclosed by the invention, an air channel communicated with an air inlet is arranged in an inner cavity of a shaft kiln body and is provided with an air feeding port; and the air channel is spirally arranged on the inner cavity wall from bottom to top. The high-efficiency roasting shaft kiln disclosed by the invention is mainly used for roasting the stone coal and is uniform, complete and sufficient in combustion and favorable in roasting effect; the cost of roasting each ton of vanadium in the rotary kiln by using 5 tons of standard coal is saved; 1000 tons of stone coals are roasted each day by 24 persons; the output of the shaft kiln is equivalent to over two times that of the flat kiln; the roasting conversion rate of the shaft kiln is 10-15 percent higher than the flat kiln; during roasting, the dust discharge capacity is only one tenth of the rotary kiln; and in addition, dust and flue gas of the shaft kiln can be centrally treated and remarkable economic and environment-friendly benefits are obtained.

Description

technical field [0001] The invention relates to a roasting kiln, in particular to a high-efficiency stone coal roasting vertical kiln for roasting vanadium-containing minerals to extract vanadium, in particular for roasting stone coal in alkali leaching of vanadium by roasting stone coal. Background technique [0002] The existing use of stone coal to extract vanadium requires roasting of stone coal. At present, flat kilns and rotary kilns are used for roasting stone coal. Their disadvantages are that flat kilns have a low degree of automation, and 120 labors are required to roast 1,000 tons of stone coal per day; rotary kilns have high operating costs. Vanadium needs 5 tons of standard coal, and the conversion rate of stone coal roasting is low, only about 65%, and the output is small, and the dust content is high. Generally, the dust content of rotary kiln is equivalent to 1-2% of the ore entering the furnace, causing serious environmental pollution. [0003] Aiming at th...

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Problems solved by technology

At present, flat kilns and rotary kilns are used for roasting stone coal. Their disadvantages are that flat kilns have a low degree of automation, and 120 labors are required to roast 1,000 tons of stone coal per day; rotary kilns have high operating costs. Vanadium needs 5 tons of standard coal, and the conversion rate of stone coal roasting is low, only about 65%, and the output is small, and the dust content is high. Generally, the dust content of rotary kiln is equivalent to 1-2% of the ore entering the furnace, causing serious environmental pollution.

Although the "stone coal vanadium extraction and roasting vertical kiln" has realized the automation of stone coal roasting and improved labor efficiency, the opening of its waist tuyere is also conducive to the realization of medium-temperature spontaneous combustion of stone coal, which greatly reduces the cost of stone coal roasting and improves the efficiency of stone coal roasting. efficiency and roasting conversion rate, but the distribution of air in the vertical kiln, especially the larger shaft kiln with a diameter of 3-5m, is difficult to meet the requirements of medium-temperature spontaneous combustion of stone coal, and the roasting conversion rate is not high. The advantages of vertical kiln roasting stone coal Far from being fully utilized, there is a lot of potential to be tapped

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