JPS6080561A - Processing method of abrasive powder - Google Patents

Abstract

PURPOSE:To eliminate generation of heat and promote the prevention of fire occurrence when abrasive powder is dried, by immersing the abrasive powder containing magnesium in a solution of sodium bicarbonate to be thrown away after changing the magnesium into magnesium carbonate. CONSTITUTION:When ductile cast iron or the like containing 0.04-0.05wt% magnesium is polished by an abrasive machine 1, cooling or seizure preventing abrasive fluid 2a and abrasive powder 2b containing an abrasive grain are allowed to flow into an abrasive fluid tank 4 from the abrasive machine 1. And if abrasive powder 3 is taken out from the inside of the tank 4, charged into a reaction fluid tank 5 and stirred by a stirring device 6, magnesium in the abrasive powder 3 causes reaction to become magnesium carbonate. Here the magnesium, being stable salt even if it is dehydrated and dried, never causes reaction with oxygen in the air. Next, a precipitate 9 consisting of the magnesium and the abrasive powder is taken out from the reaction fluid tank 5, and if the precipitate 9, being dried by a drying device 11 after dehydration by a dehydrating device 10, is thrown away, fire occurrence can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for treating abrasive powder containing magnesium (Mg).

[Prior art]

Generally, when a member containing magnesium, such as Dekuquil 6ji iron, is polished, polishing powder containing magnesium is produced, but if this polishing powder is left to dry, magnesium will interact with oxygen in the air (1) Formula % Formula % reaction occurs and generates heat. Therefore, if there is flammable material around, there is a risk of a fire occurring due to the heat generated. Conventionally, in order to avoid such problems, abrasive powder was dried and heated in small quantities in a safe place to convert the magnesium in the abrasive powder into stable magnesium oxide (MgO), and then the dirt was disposed of. was.

In addition, a conventional method for processing cutting powder containing magnesium was to dissolve the cutting powder in a large amount of aqueous solution such as seawater, thereby converting metallic magnesium into magnesium ions and magnesium hydroxide. However, this method has the problem of requiring a long processing time due to the slow reaction rate when dissolving the cutting powder.

In addition, as a conventional method for processing processed powder containing magnesium, a method of redissolving the processed powder is also known, but since abrasive powder also contains abrasive grains etc., processing of abrasive powder is difficult. This method of remelting cannot be used.

[Purpose of the invention]

The present invention has been made in view of such conventional problems, and includes a method for treating abrasive powder containing magnesium.
The object of the present invention is to provide a method for processing abrasive powder that does not generate heat when drying the abrasive powder, and therefore does not pose the risk of fire.

[Structure of the invention]

The present invention is a method for treating abrasive powder, in which abrasive powder containing magnesium is immersed in a sodium bicarbonate solution to convert the magnesium into magnesium carbonate, which is a stable salt, and then the abrasive powder is discarded. .

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

The drawing shows a schematic configuration for explaining the processing steps of an embodiment of the present invention, and in the drawing, reference numerals 1 and 4 denote a polishing machine having the same structure as the conventional one, and a polishing liquid and polishing powder from the polishing machine 1 are stored. This is the research liquid tank.

Reference numeral 5 denotes a reaction liquid tank for carrying out the reaction in the treatment method of the present example, and the reaction liquid tank 5 is made of a plastic material with an opaque finish that can withstand weak alkalis. A reaction solution 7, which is a 5% by weight sodium hydrogen carbonate (NaI(CO2) solution) with a hydrogen ion concentration (PH) of 8.2 to 8.5, is stored in the reaction solution tank 5. (W pushing device 6 for stirring the layer reaction liquid 7 and the object to be treated and P for measuring the pH of the reaction liquid 7)
An H/J1 constant device 8 is attached. Also, 12 is a user tank for sodium hydrogen carbonate, which is
This is for adjusting the concentration of the reaction liquid 7 in the two-G reaction liquid tank 5, and the reserve tank 12 contains a 5 mass% sodium bicarbonate solution.

Further, 10 is a dehydrating device for dehydrating the precipitate 9 in the reaction liquid tank 5, and 11 is a drying device for drying the dehydrated precipitate 9.

Next, the processing steps of this embodiment will be explained along with the above drawings.

Materials that contain magnesium, e.g. 0 magnesium
．． When ductile cast iron containing 0.04 to 0.05% by weight is polished by the polishing machine 1, the polishing machine 1 produces a cooling or anti-seizing polishing liquid 2a and a polishing powder 2b containing abrasive grains.
flows into the polishing liquid tank 4.

Next, take out the abrasive powder (including abrasive grains) 3 from the two-layer abrasive liquid tank 4, and put it into the tank 5 in reaction i1,
When stirred by the stirring device 6, the magnesium in the abrasive powder 3 undergoes the reaction of formula (2) (% formula 3) and becomes magnesium carbonate (MgCO3).Here, this magnesium carbonate is a stable salt, and this Even if it is dehydrated and dried, it will not react with oxygen in the air.

In addition, in order to process the above-mentioned ductile cast iron (υ[milled powder 3), if 5% by weight sodium bicarbonate/8 solution is used in IC, it will react well and can be processed efficiently.

Further, the pH of the reaction 71 in the reaction liquid tank 5 is measured by the PH measurement device W8, and the reaction liquid 7 acts effectively when the pH is between 8.0 and 9.0. Therefore, the pH of the reaction solution 7 is 8.0 to 9.0.
A precipitate 9 made of charcoal abrasive powder is taken out from the reserve tank 12 as shown in FIG. .

In this way, in the method of this embodiment, the magnesium in the abrasive powder is converted to magnesium carbonate, which is a stable salt, and then dehydrated and dried before being disposed of, so that the magnesium in the abrasive powder interacts with oxygen in the air. There is no reaction, and therefore it is possible to prevent the 1lIfPJ powder from generating heat and thus causing a fire.

〔Effect of the invention〕

As described above, according to the method for treating abrasive powder according to the present invention, the abrasive powder is crushed in a sodium bicarbonate solution, and the magnesium in the abrasive powder is reacted with thorium bicarbonate, which is a stable salt, carbonic acid. Since the abrasive powder is made of magnesium and then the abrasive powder is disposed of as a waste, it is possible to prevent the abrasive powder from generating heat and thus to cause a fire, and as a result, the abrasive powder containing magnesium can be efficiently processed.

[Brief explanation of drawings]

The drawings are based on one embodiment of the present invention (i'Fl'J powder processing power) Applicant: Toyo Kogyo Co., Ltd. Representative Patent Attorney Ken Hayase -

Claims (1)

[Claims] (1) Polishing powder containing magnesium with hydrogen carbonate 1
- A method for processing abrasive powder, which comprises immersing the abrasive powder in a lithium solution to convert magnesium in the abrasive powder to magnesium carbonate, and then discarding the abrasive powder.