About Us

Henan LIMING Heavy Industry Science and Technology Co. LTD which mainly manufacture large and medium-sized crushing and grinding equipments was founded in 1987. It is a modern joint-stock corporation with research, manufacturing and sales together. The Headquarter is located in HI-TECH Industry Development Zone of Zhengzhou and covers 80000 m ². Another workshop in Shangjie Industry Park covers 67000 m ². Over the more than 30 years, our company adheres to modern scientific management system, precision manufacturing, pioneering and innovation. Now LIMING has become the leader in domestic and oversea machinery manufacturing industry.

120

million

cubic meters

Industrial chain production base

70

national patents

689sets

national patents

170

Equipment service country

Company Culture

core values of the company

Create Value

Share Value

Observe Order

Respect Value

Service philosophy

Religious, fine, tight, and harmonious

LIMING spirit

Standardization, value, serialization, and differentiation will always exceed our contract

Brand Concept

Create and promote civilization, refine and interpret brilliantly

Business philosophy

Religious, meticulous, rigorous, and harmonious work

Our Global Footprint

Case Scene

Step-by-Step Gold Recovery From Circuit Boards ...

21/01/2014  Gold can be removed from circuit boards in a variety of ways. It can be scraped off of the boards by hand, which is time consuming, but yields excellent results. The gold can also be removed via a process known as reverse electroplating, where a chemical solution and electricity are used to draw the gold off of the circuit board. Finally, gold can be removed by dissolving it in a harsh chemical bath, then drained and purified. Chemical baths are some of the most common form of gold ...

How to Extract Gold from a Circuit Board Earth Lab -

24/08/2018  How to Extract Gold from a Circuit Board Earth Lab - YouTube.

Is Extracting Gold from Printed Circuit Boards Possible ...

13/07/2010  There are several methods that are used practically to extract gold from a printed circuit board. But before we can start the process we need to determine the amount of gold that the PCB contains. It can be done by a procedure which is known as “ milling ”.

How do you remove gold from circuit boards without

Put your circuit boards in a glass container. Pour the concentrated nitric acid into the glass container with the circuit boards. Stir the mixture using a glass rod until the contents become fluid in form. Is it worth getting gold from computers? The boards from 100 computers could yield as

Simple method for extracting gold from electrical and ...

circuit boards used for gold extraction (Intel and AMD brands) Figure 2. Six steps used to extract gold from computer circuit boards. Environmental Health Engineering and Management Journal 2017, 4(1), 55–58 57 Dehchenari et al feasible (7, 8). Optimum recovery in the present study was 82.3%. Other researchers achieved higher recovery rates using special solvent. Quinet et al managed to ...

Recovering Gold and Precious metals from Circuit Boards

Most circuit boards contain all sort of precious metals: Gold, Silver, Palladium and sometimes Platinum. All circuit boards contain base metals: Copper, Nickel, Aluminum, Zinc, Tin, Lead and Iron. As well, small amount of hazardous elements like Beryllium, Barium and others that has to be considered while processing scrap circuit boards.

How to Extract the Gold From Computer Circuit Boards ...

21/01/2014  Circuit Boards printed circuit boards If you have access to a large amount of e-waste, you may literally be sitting on a gold mine. There is gold that can be recovered from discarded computer circuit board s--but in such small amounts that the time-consuming and dangerous process required to remove gold from computer circuits is only worth your while if you have at least 1.5 tons of used boards.

Is Extracting Gold from Printed Circuit Boards Possible ...

13/07/2010  Extracting gold from a printed circuit board is definitely possible but the amount of the gold in the PCB has to be evaluated first. The process involves a number of steps which have to be carried out carefully in order to get the desired results. There are some instruments and acids involved in the process. Necessary precautions must be taken before starting the procedure.

How do you remove gold from circuit boards without

Put your circuit boards in a glass container. Pour the concentrated nitric acid into the glass container with the circuit boards. Stir the mixture using a glass rod until the contents become fluid in form. Is it worth getting gold from computers? The boards from 100 computers could yield as much as $3,000 worth of gold.

Using acid and fire to get gold out of circuit boards ...

26/08/2013  BBC science show Bang Goes the Theory goes all out to extract gold from old circuit boards. Host Jem Stansfield uses acid and high heat to extract the precious metal. One of gold

Recovering Gold and Precious metals from Circuit Boards

Recovering Gold and Precious metals from Circuit Boards. Congratulations, you have decided to enter to the amazing world of computer recycling and electronics recycling, recovering gold and precious metals from E waste is one of the most interesting and challenging practice in the recycling Industry. All electronic devices contains inside of them circuit boards, in this article we will discuss ...

How to extract gold from electronics WIRED UK

07/03/2014  How to extract gold from electronics Collect your scraps. In phones, most of the gold is in the SIM card, the main board and the smaller components on the... Strip out the boards. Place your circuit boards in a glass vessel. In another container, mix two parts hydrochloric acid... Collect the ...

New process extracts gold from electronics - The Johns ...

11/02/2016  In their experiments, gold from electronic circuit boards were dissolved in around 10 seconds. In a large scale study, 100 liters of the solution was capable of dissolving one kilogram of gold. Additionally, the fluid is cheap and more environmentally-friendly than sodium cyanide; a liter of this solution costs 50 cents and can be reused in subsequent extractions. This novel solvent resembles ...

A better way to mine gold from old electronics

31/08/2016  Gold is often found on printed circuit boards, particularly under keyboards where its durability is an advantage. According to the UE researchers, about 300 tonnes of the metal are used in ...

This new method for getting gold from e-waste may be

18/10/2017  The 650,000 square foot plant will shred and pulverize discarded circuit boards and other electronic waste. Then, using proprietary technology, Jabil will extract gold and other precious metals ...

How to Separate Gold, Silver and Platinum? — Reclaim ...

04/02/2021  Printed Circuit Boards and Electronics. Printed circuit boards from virtually any kind of electronic devices can contain gold and silver, as well as lead or silver-based solder, copper, and of course plastic that will melt and fall away when the board is exposed to high heat. Photographic and X-Ray Films and Papers

How to Extract the Gold From Computer Circuit Boards ...

21/01/2014  Circuit Boards printed circuit boards If you have access to a large amount of e-waste, you may literally be sitting on a gold mine. There is gold that can be recovered from discarded computer circuit board s--but in such small amounts that the time-consuming and dangerous process required to remove gold from computer circuits is only worth your while if you have at least 1.5 tons of used boards.

Using acid and fire to get gold out of circuit boards ...

26/08/2013  BBC science show Bang Goes the Theory goes all out to extract gold from old circuit boards. Host Jem Stansfield uses acid and high heat to extract the precious metal. One of gold

New process extracts gold from electronics - The Johns ...

11/02/2016  In their experiments, gold from electronic circuit boards were dissolved in around 10 seconds. In a large scale study, 100 liters of the solution was capable of dissolving one kilogram of gold. Additionally, the fluid is cheap and more environmentally-friendly than sodium cyanide; a liter of this solution costs 50 cents and can be reused in subsequent extractions. This novel solvent resembles ...

Salvaging Gold From Old Electronics Hackaday

19/11/2013  November 18, 2013 at 7:05 pm. Prices for circuit boards start around $2.50/lb if you strip them out and take them to a scrapper. Extension cards and denser circuit boards

How to Make Money Recovering Scrap Gold from

Is Recovering Scrap Gold from Computers and Electronics Worth It? As a matter of fact, a ton of computer circuit board and micro chips contains as much as 800 times more gold than what is obtainable in one ton of gold. The good thing about this process is that it would only cost you about 20 US Dollars to recover 1oz. worth of scrap gold and the value of this can be as high as 300 US Dollars ...

How Much Gold Can Be Recycled from Scrap Electronic

09/06/2014  Watch the Gold You Can Recycle from Circuit Boards Pile Up in these Videos. What Precious Metals Are Contained in Piles of Old Desktop Computers? Extracting Gold from Ceramic IC Chips. June 09, 2014 / Barry Lenson / Comment. Electronics manufacturers, Recycle and Refine Gold, Recycling Electronics. cpu memory chips, gold-plated pins, ceramic ic chips, silicon CPU, escrap,

Recovery of Gold, Silver, Palladium, and Copper from Waste ...

Abstract—Printed circuit boards (PCBs) are ... wt% copper, 0.04 wt% gold, 0.15 wt% silver, and 0.01 wt% palladium. The extraction of these metals from PCBs is both profitable and environmentally worthwhile. Hence, this study aims to design a commercial process to extract these four metals from PCBs of computers and mobile phones. This paper discusses the relevant market analysis and

Is it profitable to recycle gold from electronic devices?

01/05/2020  Current Gold Gram Bar Values Description Gold Value (USD) 1 gram gold bar $50.82 2.5 gram gold bar $127.05 5 gram gold bar $254.10 10 gram gold bar $508.20 What everyday items contain gold? Laptops, phones, cameras, and the like are filled with gold plated circuit boards even printers and scanners have gold, silver, and copper, even platinum in them.

Scientists find a new way to recover GOLD from mobile ...

31/08/2016  The method involves placing the circuit boards into mild acid to dissolve all the metal parts. An oily liquid which contains a chemical compound is then added, which only extracts the gold.

A green process for extracting gold - New Atlas

03/02/2016  A research team at the University of Saskatchewan has found what may be an inexpensive and environmentally-friendly way of recycling gold from jewelry and