Magnesium slag-based sectional carbon composite bonding agent

Abstract

The invention relates to a magnesium slag-based sectional carbon composite bonding agent, which comprises a component A and a component B, wherein the component A is prepared by mixing the following materials in part by weight: 70 to 85 parts of magnesium slag, 12 to 25 parts of CaCl2 and 8 to 18 parts of charcoal powder; the component B is polyvinyl alcohol powder; and the weight part ratio of the component A to the component B meets 100:2.5-4. The composite bonding agent simultaneously uses the magnesium slag and polyvinyl alcohol which interact with each other, so the composite bonding agent not only plays a role in bonding, but also improves the sectional carbon strength. Tests show that the burn-off rate of the sectional carbon prepared from the magnesium slag composite bonding agent reaches 98.8 percent, the sulfur dioxide emission is less than or equal to 600 mg / m3, the soot emission concentration is less than or equal to 320 mg / m3, the flue gas blackness is less than 1 grade, the coal saving rate is between 18 and 30 percent, the ash after burning is only 30 to 40 percent of that of a rough coal, the energy is saved by 27.75 percent, which reach the technical requirements on nationally promoted cleaned coal.

Description

technical field [0001] The invention relates to a binder for preparing carbon, in particular to a composite binder for carbon with magnesium slag as the main raw material. Background technique [0002] my country's briquette technology development started in the early 1970s and has a history of more than 30 years. Although great progress has been made after several upgrades, there are very few briquettes that can really meet the requirements of energy conservation and environmental protection. [0003] Binder is the key to the production technology of briquette. Now domestic briquette binders can be roughly divided into organic binders, inorganic binders, industrial powder binders and composite binders. Their advantages and disadvantages Roughly as follows: [0004] 1. Organic binders: such as humic acid binders. Although this type of binder has no effect on the calorific value of coal, it does not have the characteristics of sulfur fixation, smoke reduction and waterproof...

AI Technical Summary

Problems solved by technology

[0004] 1. Organic binders: such as humic acid binders. Although this type of binder has no effect on the calorific value of coal, it does not have the characteristics of sulfur fixation, smoke reduction and waterproofing, and cannot meet environmental protection requirements.

[0005] 2. Inorganic binders: such as cement and clay binders. Although the briquettes made of cement binders have certain strength and water resistance, their thermal stability is poor, and the ash content is increased to reduce the calorific value of briquettes ; The briquette made of clay binder not only increases ash content, reduces heat, but is not waterproof

Therefore, this type of adhesive should not be promoted

[0006] 3. Industrial powder binders: such as pulp waste liquid binders, tanning waste liquid binders, etc. The use of such binders to make briquettes can reduce the pollution of waste to the environment, but the process requires drying , it needs to consume a certain amount of energy, and the briquettes produced are not waterproof, difficult to transport and store, do not fix sulfur, do not reduce smoke, and do not meet environmental protection requirements

[0007] 4. Composite binders: such as binders made of starch and minerals, the production cost of this kind of binder is too high, the processing technology is complicated, and it needs to be dried at 100-150°C for 3-4 hours , a waste of energy, and does not meet environmental protection requirements

Images