Production method of semi-hydrated gypsum powder

Abstract

The invention relates to a production method of semi-hydrated gypsum powder. The production method has the technical points that gypsum materials are conveyed to an electronic belt scale through a gypsum conveyer system and then enter a turbulence breaking drier through a hopper; meanwhile, high-temperature hot wind generated by a hot wind furnace directly enters the turbulence breaking drier to quickly dry the gypsum materials, and drying and sintering are finished in the drier in one step; generated high-concentration powder materials are wrapped and held by hot wind and directly enter a vortex sedimentation drier arranged above the turbulence breaking drier, and after carrying out drying and gas-liquid separation through the vortex sedimentation drier, dry materials are discharged from a discharge outlet of the vortex sedimentation drier and fall on a first scraper conveyer; the dried and sintered gypsum powder are conveyed to a feed inlet of an aging device by the first scraper conveyer; meanwhile, a second draught fan is started to suck the materials into the aging device, and the materials are discharged on the first scraper conveyer through a discharge outlet of the aging device after aging and conveyed to a feed inlet of a bucket type lifter through the horizontal scraper conveyer; and then the materials are conveyed to a second scraper conveyer through the bucket type lifter and fall in a tempering storage silo through a rotary valve. The production method can improve the product quality, reduce the energy consumption and reduce occupation area.

Description

technical field [0001] The invention relates to a production method of building materials, in particular to a production method of hemihydrate gypsum powder. Background technique [0002] With the rapid development of the national economy, the improvement of people's living conditions and the prosperity of business, the construction industry has developed rapidly. Therefore, the consumption of building gypsum powder has been greatly increased. The main component of gypsum powder for construction is dihydrate gypsum. To make it a practical building material, it must remove crystal water to make β-type hemihydrate gypsum. This process is called calcination of gypsum. [0003] According to the characteristics of desulfurized gypsum, the key to making it into high-quality building gypsum powder lies in the drying, calcination and post-processing procedures. At present, there are roughly two representative processes at home and abroad: [0004] 1. Integrated process of airflow ...

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Problems solved by technology

[0007] The desulfurization gypsum treatment project of Taiyuan No. 1 Thermal Power Plant has been put into operation for many years using the airflow drying + frying pan calcination process, and the effect is not good. The rotary kiln + fluidized furnace calcination two-step process adopted by Tongling Lafarge and the hammer drying adopted by Tongling Luyang Building Materials Machine + fluidized furnace calcination two-step process, the product quality is relatively good, but the equipment investment is huge, the energy consumption is high, and the equipment process is more complicated

[0008] At present, traditional equipment suitable for gypsum drying and calcination in industrial production includes: rotary kiln, fluidized fluidized furnace, air drying (hammer dryer, flash dryer, pulse tube dryer), etc., but these equipment include their various Each combination has its own weaknesses, such as poor initial dispersion of raw materials, relatively low thermal efficiency, high operating cost of bag filter at the end, large wind resistance, large installed capacity, high energy consumption, no post-processing technology, and product quality control means Relatively weak and other disadvantages

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