Preparation method and application of modified semi-coke

Abstract

The invention relates to a preparation method and application of modified semi-coke. The preparation method comprises the following steps that semi-coke powder is pre-prepared, different semi-coke rawmaterials are sampled and analyzed, primarily selected semi-coke raw material collected amplified samples are re-analyzed, the types and the amounts of the semi-coke raw materials are determined according to a production requirement, process proportioning is conducted on the raw materials by combining parameters obtained by sampling and analyzing the amplified samples, proportioned semi-coke rawmaterials are mixed and then is subjected to static pressure crushing through a modification machine, and screen size control is carried out on semi-coke crushed material passing through the modification machine to obtain the modified semi-coke meeting a particle size distribution requirement so as to achieve the Hardgrove grindability index of greater than 53. According to a blast furnace processrequirement, pulverized coal is added into the modified semi-coke or the modified semi-coke is independently adopted as a blast furnace injection raw material.

Description

technical field [0001] The invention belongs to the field of energy raw material preparation, and in particular relates to a preparation method of modified semi-coke and the application of the modified semi-coke prepared by the method in blast furnace injection. Background technique [0002] As a new type of carbon material, semi-coke has the characteristics of high fixed carbon, high specific resistance, high chemical activity, low ash content, low aluminum, low sulfur and low phosphorus. After the Ministry of Industry and Information Technology promulgated the access policy of coking products in 2014, semicoke came into people's field of vision. In 2016, it was officially included in the ranks of clean energy by the country, and its use was fully promoted nationwide, and semicoke was gradually promoted to replace coke (metallurgical coke). Widely used in chemical industry, smelting, gas production and other industries to control coal combustion pollution. [0003] Iron an...

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Problems solved by technology

[0005] The low Hastelloy grindability of semi-coke has seriously affected the pulverization efficiency, making it difficult for the medium-speed mill to meet the production requirements, and thus unable to increase the proportion of semi-coke in the injection coal powder. figure 2 It can be seen that the change of Hardwood's grindability index in the process of mixing semi-coke and bituminous coal does not show a linear relationship. The addition of semi-coke makes the Hardwood's grindability index of mixed coal powder drop sharply. When the mixing ratio reaches 50%, Ha The grindability index of semi-coke is almost the same as that of semi-coke itself. Therefore, in order to meet the requirements of the Hastelloy's grindability index of mixed coal powder, the mixing ratio of semi-coke is low. At present, semi-coke is used for blast furnace spraying. The mixing ratio of iron and steel enterprises used in blowing is generally 10%-15%, the highest is not more than 25%, and it is difficult to completely replace pulverized coal, which seriously affects the realization of the de-coalization process

[0006] (2) Semi-coke has serious wear and tear on conveying equipment, which shortens the equipment replacement cycle and increases production costs

[0007] At present, iron and steel enterprises that use semi-coke as raw material for blast furnace injection have not taken effective measures to address the above problems. The process flow used is as follows Figure 4 As shown, the only way to meet the production efficiency requirements and alleviate the wear of the injection equipment is to reduce the proportion of semi-coke used.

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