Brief review of Shanghai copper on April 6
Time of Update: 2022-12-24
Shanghai copperDuring the festival, London copper rose sharply and then partially retraced, and Shanghai copper opened high and low after the open, repairing the Shanghai-London price difference.
December 18 Shanghai copper afternoon review
Time of Update: 2022-12-17
Sino-US trade negotiations reached the first phase of agreement, the United States promised to gradually eliminate tariffs, British election Johnson won by a high vote, the outlook for Brexit is more optimistic, domestic economic data has improved, and short-term non-ferrous prices may rise under the stimulation of macro positive news.
How to maintain the spray filling machine
Time of Update: 2022-04-28
The machine must be kept clean, and it is strictly forbidden to have oil stains, liquid medicine or glass debris on the machine, so as to avoid damage to the machine.
Dodecyl Trimethyl Ammonium Chloride
Time of Update: 2022-01-04
In the autoclave, first add dodecyl dimethyl tertiary amine, ethanol and water, and add a small amount of alkali, replace the air in the autoclave with nitrogen, raise the temperature to the reaction temperature, pass in methyl chloride, and react for a few hours.
(1) Circulating cooling water treatmentIn industrial circulating water treatment, the impact dosing method is generally used .
Fuel oil market will accelerate the transition to low sulfide
Time of Update: 2021-11-08
According to the analysis of experts from the Sinopec Institute of Economics and Technology, after the implementation of the new regulations of the International Maritime Organization, the total market size of low-sulfur ship fuel is expected to be about 200 million tons per year, of which low-sulfur heavy fuel oil is mainly used.
Determination of total ash in flour (2
Time of Update: 2021-07-25
Pay attention to the intensity of the heat source when the sample is carbonized to prevent a large amount of foam from overflowing the crucible .
Printing technology , dialysis ink foaming 4 big "really fierce
Time of Update: 2020-12-06
When too much air is incorporated into the ink in the supply pipe, it can cause the ink to foam.
solution : such a problem is better to solve, reduce the air supply pressure can be.
Coating technology: the basic procedure of automobile paint color matching
Time of Update: 2020-04-03
Core tip: there are tens of thousands of colors of automobile paint, and there are color differences in different batches of the same type of paint, with different service life, which will also produc
Precautions for the application of metal powder coatings
Time of Update: 2020-03-25
1 metal powder coating coating method in most cases is the use of electrostatic spray gun for half-packing, because this type of product contains metal pigments, in the use of electrostatic gun cons
Common types and uses of support spring of vibrating screen
Time of Update: 2019-12-24
The elastic elements used in the vibration screening equipment can be divided into three categories according to their purposes: 1 Main vibration spring: its function is to make the vibration machiner
An introduction to the factors influencing the measurement accuracy of infrared thermometer
Time of Update: 2019-09-03
The instrument should be used in strict accordance with the environmental temperature indicated in the technical indicators of the instrument When the ambient temperature is high, air-cooled, water-co
Environmental protection was stopped at the national level, and all provinces expressed their solidarity
Time of Update: 2019-05-14
Recently, the general office of the Ministry of ecology and environment issued a notice to solicit opinions from the public on doing a good job of guiding enterprises to abide by the law (Draft for co
Serious environmental problems extraction process and equipment of traditional Chinese medicine need to be improved and upgraded
Time of Update: 2019-03-01
[industry trends of China Pharmaceutical network] data shows that at present, China's traditional Chinese medicine industry is about 900 billion yuan, accounting for about one third of the total outpu
[quick news] on Thursday, March 29, 2018, US universities' handling of academic misconduct led to stricter supervision
Time of Update: 2018-03-29
The US National Institutes of Health (NIH) have imposed unusual new requirements on federal funded Duke University researchers in recent days as they face tougher regulation over the handling of acade
Evaporator is also one of the main heat exchange equipment in refrigeration system
Time of Update: 2013-08-28
Forced circulation evaporator is also one of the main heat exchange equipment in refrigeration system Its function is to rely on the boiling (commonly known as evaporation) of the low temperature and