Precision casting sand production line and production method using coke gemstone as main raw material

Abstract

The invention discloses a production line and production method of precision foundry sand with flint clay as a main raw material. The production line comprises a crushing system, a pulverizing system, a granulating system, a sintering system, an airtight rotary drum and a sand kneading machine. Finished product sand is conveyed to a finished product warehouse by using a bucket elevator. The production method comprises the following steps of: (1) crushing flint clay mineral aggregate till particle sizes are less than 20mm, and then crushing the flint clay again till particle sizes are less than 10mm; (2) carrying out dry grinding till particle sizes are 10-20 meshes, carrying out dry grinding again to obtain dry ground powder, adding the dry ground powder and an additive to a wet grinder separately, and carrying out wet grinding in the wet grinder till obtaining 10-micrometer slurry; (3) carrying out iron removal and spray drying on the slurry to form spherical powder particles with 20-120 meshes, breaking up the spherical powder particles till particle sizes are 200 meshes, grading to obtain two types of qualified powder which are coarse powder and fine powder; (4) manufacturing foundry sand raw material blanks with the qualified powder in a coating machine I, carrying out secondary polishing on the raw material blanks, and conveying the polished raw material blanks to a sintering kiln head of a rotary kiln; (5) sintering the qualified blanks in the rotary kiln to obtain the foundry sand products, and putting the foundry sand products in the airtight rotary drum; and (6) separating the foundry sand after cooling, and then elevating the foundry sand to the finished product warehouse by using the elevator.

Description

technical field [0001] The invention relates to the technical field of precision casting, in particular to a production line and production method of precision casting sand with burnt gemstones as the main raw material. Background technique [0002] Foundry sand is a granular refractory material used in the metal casting process. The particle shape and grading of foundry sand have an important influence on its performance such as fluidity, compactness, air permeability, strength and resistance to liquid metal penetration. Refractoriness, thermal stability, easy to collapse, strong reusability, etc. are the key indicators and characteristics of foundry sand selection and use. [0003] At present, foundry sand mainly uses silica as the main component and quartz sand as the main crystal phase (silica sand) and special sand (such as limestone sand, magnesia, zircon sand, olivine sand, pearl sand, etc.). The foundry industry has gone through the stages of using natural sand and...

AI Technical Summary

Problems solved by technology

However, the latter is made of high-quality bauxite as raw material by high-temperature melting and centrifugation into balls, which has a wide particle size distribution and high energy consumption.

In addition, in order to obtain foundry sand with qualified particle size, the product needs to be strictly screened, the qualified product rate is low, and a lot of energy used for high-temperature firing is wasted

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