Chrome iron ore divided by industrial use grade metallurgical, chemical grade, cast stone and refractory grade level.
1. Industrial requirements for metallurgical grade chrome ore Metallurgical grade chrome ore is mainly used for smelting various ferrochrome alloys. The chrome ore used to smelt ferrochrome alloys is divided into four grades according to different smelting purposes (the table below).
In addition to the above-mentioned composition requirements, the block size required for smelting carbon ferrochrome in blast furnace is 40-75 mm, and the block size of carbon ferrochrome in electric furnace smelting is 40-50 mm.
Metallurgical grade chromite ore can also be used to smelt metal chromium. At present, there are two methods for smelting metal chromium in China. Smelting metal chromium by wet method: chrome ore or concentrate containing Cr 2 O 3 ≥ 38 %, Cr 2 O 3 /FeO>2, SiO 2 <12%, Al 2 O 3 <10%, and the ore particle size is less than 180 The purpose should account for more than 80%.
2. Industrial requirements for refractory grade chrome ore In the refractory industry, chrome ore is mainly used to make magnesia chrome bricks, chrome bricks and chrome aluminum bricks.
The chrome ore used to produce refractory materials is divided into two grades. The first grade product is used as a natural refractory material, and the quality requirements are: Cr 2 O 3 ≥ 35%, SiO 2 ≤ 8%, and CaO ≤ 2 %. The second grade is used to produce chrome bricks and chrome-magnesia bricks. The quality requirements are: Cr 2 O 3 ≥ 30% ~ 32%, SiO 2 ≤ 11%, CaO ≤ 3%.
For the above two grades, the ore block size is required to be between 50 and 300 mm, and no more than 5 to 8 mm of stone is not allowed in the ore.
3. Industrial requirements for chemical grade chrome ore In the chemical industry, chrome ore is mainly used to produce dichromate (chromium salt), which is then used as a raw material to produce other chromium compound products. The chrome ore industry for chromium salts requires: Cr 2 O 3 ≥ 30%, Cr 2 O 3 / FeO ≥ 2 to 2.5, and a small amount of SiO 2 .
4. The cast stone chrome ore industrial requirements for the production of chrome ore diabase, their quality requirements: Cr 2 O 3 ≥10% ~ 20%, SiO 2 ≤10%.
Groove and raceway machining of bearing ring is the final processing procedure of bearing ring.The surface roughness, high quality and low noise of bearing products can be obtained by ultra-precision machining of bearing rings after fine grinding with oilstone.
It is mainly used for superfinishing the outer groove of deep groove ball bearings, angular contact ball bearings& double-row ball bearings.
Main Structures and Features
1.Adopting
SIEMENS.FANUC.MITSUBISHI
full-digital servo-control system.
2.Centerless
clamp, bearing support, bearing pressure on the end face of workpiece.
3.The
adjustment of groove position is controlled by servomtor
4.The
consumption of oilstone can be compensated automatically.
5.The
oscillation frequency of oilstone and the turning speed of work can be adjusted
by frequency convertor, rough or fine superfinishing converted automatically.
Bearing Ring Super Finish Machine
Super Finishing Machine,Bearing Ring Super Finish Machine,Grooves Super Finish,Bearing Super Finish Machine
Xinxiang Sunrise CNC Bearing Equipment Co., Ltd. , https://www.cncsunrise.com