Acidic copper dissolution solution

The invention relates to an acidic copper dissolution solution, which is prepared from cupric nitrate, acid and hydrophilic solvents. The acidic copper dissolution solution can be used for the acidic etching preparation process of a PCB (printed circuit board) and other surface treatment fields, and has the characteristics of high solution stability, no chlorine gas generation, good potential performance of recycled regenerative use and the like.

Method for preparing cuprous compound

The invention relates to a method for preparing a cuprous compound, in particular to a method for preparing a cuprous compound from a cupric solution. The method comprises the following steps: in a solution containing cupric ions, in the existence of ligands which can form complex ions with cuprous ions, electrochemical reduction is performed on the cupric ions so that the cupric ions in the solution are only converted to cuprous complex ions, and the cuprous complex ions are used to prepare cuprous salt or cuprous oxide. The invention provides a simple and practical method for preparing cuprous ions from cupric ions; and the obtained solution containing cuprous ions can be used for conveniently preparing the cuprous compound. The obtained compound is easy to separate and purify.

Motorized spindle structure for turning and milling

The invention discloses a motorized spindle structure for turning and milling, which comprises a box body and a spindle, wherein the spindle is arranged in the box body, the front end of the box body is fixedly connected with an end cover and a front bearing seat, a front bearing is arranged between the front part of the spindle and the front bearing seat, an annular space is left between the front bearing seat and the outside of the front part of the spindle, the inside of the annular space is provided with a piston body sleeved on the spindle, a front cavity is formed in the front of the piston body, a rear cavity is formed in the back of the piston body, the rear side face of the piston body is fixedly provided with an annular connecting-end fluted disc, a step at the front part of the spindle is fixedly provided with an annular inner-end fluted disc, a step at the front side of the box body is fixedly provided with an annular outer-end fluted disc, the teeth on the connecting-end fluted ...

Metal-dissolving solution

The invention relates to a method for preparing metal-dissolving solution. The solution contains amino acid as core component, and in addition, the solution contains pH regulator, redox potential regulator and water which are blended with the amino acid. The metals which can be dissolved in the solution include copper, nickel, zinc, tin, lead and alloy thereof, and gold . The invention can be applied in the copper-etching process of the printed circuit board industry, the deplating process of the plating industry, the related process of other surface-processing industries and the extraction field of gold and non-ferrous metal.

Preparation method of ferric chloride

The invention discloses a preparation method of high-quality ferric chloride with very low quantity of copper from the raw materials containing chlorine ions and copper ions. The method comprises the following steps: adding material containing elemental ferrum to waste liquid containing chlorine ion and copper ions until no copper substance is precipitated; then adding benzotriazole hydrochloric acid, after filtering and separating, concentrating filtrate to obtain the ferric chloride. By using the method, the chlorine ions of the waste liquid which contains chlorine ions and copper ions are effectively utilized and transferred to the ferric chloride product. The heavy metals originally contained in the waste liquid (e.g. copper ions) are no harmful to environment and are easy to recycle and reuse.

Local area network system and method for maintaining safety thereof

The invention discloses a local network system and a method for maintaining the safety thereof and belongs to the field of network safety. The system comprises network monitoring equipment, a safety terminal, a main control server, public/private secret-associated source servers and a protective server, wherein the safety terminal, the main control server, the public/private secret-associated source servers and the protective server are connected with the network monitoring equipment; the network monitoring equipment monitors data switching and forwarding; the safety terminal performs local monitoring; the main control server verifies identity and maintains safety policies; the public secret-associated source server monitors accesses to the public secret-associated sources; the private secret-associated source server monitors the accesses to private secret-associated sources; and the protective server provides data reduction protection. The method comprises the following steps that: the ...

Water-saving cultivation method of foodstuff and feed maize

The invention discloses a water-saving cultivation method of a foodstuff and feed maize. The method comprises the following steps of: 1) arranging at least three small areas, wherein each small area consists of 15 ridges and each ridge is 1,100 to 3,000cm long, 60 to 70cm wide and 15 to 20cm high; (2) arranging moisture isolation strips which are 150cm wide among the small areas in the step 1) and arranging irrigation ditches which are 40 to 50cm wide among the ridges; and 3) preventing leakage with greenhouse films among the moisture isolation strips in the step 2), covering an agricultural mulching film on each ridge in the step 2), and covering maize straw layers which are 4cm thick in the ditches among the ridges in the step 2). The method has the beneficial effects that: when the straw covering treatment on ridge film ditches is compared with the land farming treatment on ridge film ditches, the irrigation area is reduced, the soil moisture evaporation is reduced, the irrigation water ...

Stamping die

Circulation and regeneration technology for non-fluoride type etching agent

A cyclic regeneration technology for non-fluoride detining agent of PCB includes removing Pb, Sn and Cu from used detinning liquid and adding active components to obtain regenerated detinning agent for cyclic use. Its advantages are reducing environmental pollution, low cost and use of waste.

Method for irrigating forage maize

The invention discloses a method for irrigating forage maize. The method comprises the following steps: 1) arranging at least three plots, wherein each plot comprises 17 small borders; each border is 1150cm long and 120cm wide; and the bottom of a border dike is 15-20cm wide, 15-20cm high and 1150cm long; 2) arranging moisture isolation zones with width of 100-150cm among the plots in the step 1) and arranging 4 lines of plants on each border, wherein the line spacing of the plants on each border is 30-40cm; and the spacing between the plants in each line is 30-35cm; and 3) carrying out anti-seepage treatment with greenhouse films among the moisture isolation zones in the step 2) and covering the borders in the step 2) with agricultural films. The method has the beneficial effect of more comprehensively studying the effect of water saving irrigation water on the output and quality of the forage maize straws under the condition of regulation and control.

Non-cyanide gilding saline solution

The invention relates to a method for preparing non-cyanide gilding saline solution. The gold of the non-cyanide gilding saline solution exists in a state of water-soluble ions; and a ligand (a complexing agent) which coordinates the gold is a material of amino acids. The non-cyanide gilding saline solution can be prepared by adopting IEMEC technology, and can be used in the industries of PCBs (printed circuit boards), metal plating, catalyst manufacture, metal powder, nano materials and the like.

Local area network system and method for maintaining safety thereof

The invention discloses a local network system and a method for maintaining the safety thereof and belongs to the field of network safety. The system comprises network monitoring equipment, a safety terminal, a main control server, public/private secret-associated source servers and a protective server, wherein the safety terminal, the main control server, the public/private secret-associated source servers and the protective server are connected with the network monitoring equipment; the network monitoring equipment monitors data switching and forwarding; the safety terminal performs local monitoring; the main control server verifies identity and maintains safety policies; the public secret-associated source server monitors accesses to the public secret-associated sources; the private secret-associated source server monitors the accesses to private secret-associated sources; and the protective server provides data reduction protection. The method comprises the following steps that: the ...

Punching die material pressing and discharging device and ejector rod for same

The invention discloses a punching die material pressing and discharging device and an ejector rod for same, belonging to the field of punching die manufacture and punching process and aiming at solving the technical problem on that the traditional punching die is used as a general material pressing and discharging device by separating material pressing and discharging functions set one to one from the traditional punching die. The invention is matched with different novel punching dies for use by substituting the material pressing and discharging functions of the traditional punching die, thereby not only ensuring the normal functions of the traditional punching die, but also effectively solving a series of problems of difficult discharging, product deformation, large burr, unstable product dimension, and the like which are caused by insufficient material pressing and discharging force and frequently encountered by the traditional punching die, and more importantly reducing the manufacturing ...

Stamping die

This invention relates to a stamping mould suitable for design and manufacture of product stamping mould and special production of stamping mould die base (die stand) in industrial sector. This invention disintegrates the stamping mould into die base and die core, a die base corresponds to realization of multiple die cores of different stamping functions, quick-clamping and releasing mechanism isused to connect the die base and die core, and the size of die base may be designed into standard product series according to the tonnage of the stamping machine.

Using method of industrial high-purity silicon

The invention relates to a using method of industrial high-purity silicon. The using method comprises the following steps of: (1) the loading method of industrial silicon blocks while producing 8011 alloy aluminum liquid of the first furnace: calculating the amount of silicon blocks required by the furnace according to the proportion of an aluminum material, then putting the aluminum material into the furnace, igniting to heat the aluminum material, sprinkling a covering agent until the aluminum material is flattened, fully stirring the aluminum material for a plurality of times after the aluminum material is completely flattened, completely removing dross on the liquid surface after the aluminum material reaches a specified temperature, taking a furnace sample for assaying and analyzing components, adjusting the components according to an assay result, then heating the aluminum material, maintaining the temperature of the aluminum material, refining the aluminum material, and turning down ...

Electrolytic semi-reactor and application thereof

The invention discloses a method for making an electrochemical semi-reactor. The semi-reactor is developed according to the characteristics of two different semi-reactions in an electrochemical reaction, consists of an isolator through which ions of a certain type can pass, electrodes and electrolyte solution, and is characterized by serving as an independent work unit. The semi-reactor can be used to carry out specific semi-reactions such as oxidation reaction or reduction reaction and can be used in the fields related to electrolysis and electrolytic cells.

Solar full-glass vacuum tube anti-leak valve

The invention relates to a whole glass vacuum tube leakage proof valve of a solar water heater, which aims at solving the problem of water leakage caused by the breakage of the whole glass vacuum tubes. The leakage proof valve comprises a valve body, a rubber sealing strip, a waterproof ring, a pressing tablet and a fix screw. The leakage proof valve is characterized in that one end of the valve body is connected with a water tank while the other end is connected with a vacuum tube by the waterproof ring. According to the characteristic, the rubber sealing strip installs a fixed pole at the middle of the valve body by the pressing tablet and the fix screw, and the curved surface direction of the circular ring at the middle of the sealing strip changes and cold and hot water are sealed by being switched to the breaking tube by a channel. The working principle is that: after the connection of the water tank, the vacuum tube leakage proof valve and the vacuum tube, water is added to the water ...