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A method of pressing composite blocks by using semi-coke and quicklime

A composite block and quicklime technology, applied in the direction of calcium carbide, carbide, etc., can solve the problems of unrealized industrial application, lack of production feasibility, and affecting the strength of block materials, so as to improve strength, reduce energy consumption, and apply good raw materials sexual effect

Active Publication Date: 2022-04-26
SHAANXI COAL & CHEM TECH INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The skeleton structure of calcium carbonate ensures the cold strength of the composite block, but because the initial decomposition temperature of calcium carbonate is only 800°C, the composite block will precipitate carbon dioxide and be pulverized in the material layer of the calcium carbide furnace, so the composite block The material forming scheme does not have the production feasibility, and the industrial application has not been realized in the end.
The surface of the semi-coke powder and coke powder in the carbon-containing powder is difficult to be wetted by water, and the binding force between the particles of the calcium powder is weak, which will seriously affect the strength of the block after forming

Method used

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  • A method of pressing composite blocks by using semi-coke and quicklime

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Experimental program
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Effect test

Embodiment 1

[0039] Sodium benzenesulfonate solution with a mass fraction of 0.05% is used as a coupling agent, and calcium sulfate powder is used as a binder; 200 g of calcium hydroxide powder with a particle size of less than 1 mm and a particle size of less than 1 mm are respectively added to the mixing container. 84g of semi-coke powder, after the initial mixing of the two, add 28g of calcium sulfate powder to the mixture to continue stirring and mixing, and finally add 8g of sodium benzenesulfonate solution to the mixture and mix evenly until there is no lump in the mixture shape; put 20g of uniformly mixed powder into the forming mold, form it under the pressure of 20MPa and keep the pressure for 1min, after the mold is withdrawn, the forming raw material is obtained, and the obtained raw material is divided into several parts, referring to the cold strength of industrial briquette The detection method is to detect the cold strength of the obtained raw material; select a part of the r...

Embodiment 2

[0041] Kaolin powder was used as binder, and 0.5% papermaking wastewater lignin solution was used as coupling agent solution. Weigh 100g of calcium oxide powder, 250g of semi-coke powder, and 30g of kaolin powder respectively, stir and mix the two kinds of powder in a mixing container, and weigh 20g of the prepared coupling agent solution and add it evenly; 20g of powder is molded using a molding die under a pressure of 30MPa, and the pressure is maintained for 1min during molding. The detection method of the hot and cold strength of the obtained block is the same as that of Example 1. The average cold strength of the obtained block is 3800N / ball, and the average hot strength reaches 1050N / ball.

Embodiment 3

[0043] Use medium-temperature coal tar pitch powder as a binder, and 0.05% sodium benzenesulfonate solution as a coupling agent solution. Weigh 80g of calcium oxide powder, 250g of Shanbei long-flame coal powder, and 25g of medium-temperature coal tar pitch powder, stir and mix the three or two kinds of powder in a mixing container, and add 8g of the prepared coupling agent solution evenly. Weigh 20g of powder each time, use a molding die under a pressure of 30MPa, and hold the pressure for 1min during molding. The detection method of the hot and cold strength of the obtained block is the same as that of Example 1. The average cold strength of the obtained block is 6000N / ball, and the average hot strength reaches 960N / ball.

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Abstract

The invention discloses a method for pressing a composite block by using semi-coke and quicklime. A composite binder is used to press the semi-coke and quicklime into a composite block. The calcareous powder in the pressed composite block according to the invention is shaped The matrix itself has good molding performance, and the carbon-containing powder acts as an inert filler; the addition of coupling agent strengthens the wetting effect of the liquid on the surface of the carbon-containing powder and the relationship between the carbon-containing powder and the calcium powder. The binding force can effectively improve the strength of the block; the binder used can withstand high temperatures above 1000°C without decomposing, and can also bond carbon-containing powder and calcium powder to improve the strength of the composite block, which can not only be used for semi- The composite molding of coke and quicklime powder has a good effect on the composite molding of carbon-containing powder and calcium powder. It has a wide range of applications, can effectively use waste powder, and reduces its initial reaction temperature. Therefore, it can The energy consumption of the calcium carbide reaction is further reduced, and the economic benefit is improved.

Description

technical field [0001] The invention belongs to the field of recovery and utilization of calcium powder and carbon-containing powder, and in particular relates to a method for pressing composite blocks by using semi-coke and quicklime. Background technique [0002] In recent years, the price of crude oil has remained low for a long time, the raw material cost of petroleum-based acetylene has been greatly reduced, and the demand for PVC has been sluggish, which has put the price of calcium carbide under long-term pressure. In 2016, the ex-factory price of calcium carbide in some areas fell below 2,000 yuan, a record low, causing a large number of calcium carbide enterprises to suffer losses. At present, more than 95% of the world's calcium carbide production and production capacity are concentrated in my country. In 2016, there were more than 220 calcium carbide manufacturers in my country, with a production capacity of more than 45 million tons of calcium carbide and an outp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/942
CPCC01B32/942
Inventor 陈刚杨小彦徐婕李瑶
Owner SHAANXI COAL & CHEM TECH INST
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