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Nanjing Shangren Chemical Industrial Co.Ltd

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1. What is Froth flotation?
Froth flotation is considered to be the most widely used method for ore beneficiation. In ore beneficiation, flotation is a process in which valuable minerals are separated from worthless material or other valuable minerals by inducing them to gather in and on the surface of a froth layer. Sulfide and non-sulfide minerals as well as native metals are recovered by froth flotation. This process is based on the ability of certain chemicals to modify the surface properties of the minerals. Other chemicals are used to generate the froth and still others are used to adjust the PH. Certain chemicals are even capable of depressing the flotation of minerals that are either to be recovered at a later time or are not to be recovered.
The process of froth flotation entails crushing and grinding the ore to a fine size. This fine grinding separates the individual mineral particles from the waste rock and other mineral particles. The grinding is normally done in water with the resultant slurry called the pulp. The pulp is processed in the flotation cells, which agitate the mixture and introduce air as small bubbles.
The ability of a mineral to float depends upon its surface properties. Chemical modification of these properties enables the mineral particles to attach to an air bubble in the flotation cell. The air bubble and mineral particle rise through the pulp to the surface of the froth or foam that is present on the flotation cell. Even though the air bubbles often break at this point, the mineral remains on the surface of the froth. The mineral is physically separated from the remaining pulp material and is removed for further processing.

2. Comparing with yellow collecting agent, what is the advantage of black catching agent?
(1) Lower collector, selective high. Therefore, in the high sulfur content of iron, copper or lead
& zinc sulfide flotation as a flotation collector, black catching agent can get a better quality of concentrates, and many kinds of black collector has good performance in gold collecting process.
(2) Stability, and will not be rapidly decomposed under lower PH.

3. Could the customers get some samples?
We could offer samples within 7 days. We offer free samples to our VIP clients who are our old customers.

4. What kind of payment term you can accept?
1) We offer flexible payment terms for our dear customers. Normally we prefer payment by 30% T/T in advance and balance T/T against copy of shipping documents.
2) We also accept O/A 30-360 days payment subjected to your company supply your annual financial report and company registering documents, our finance department will study and reply you within 15 days.  
3) We also accept PayPal or credit cards for our customers' convenience.
4) Payment or remittance from Kunlun bank is acceptable.

5. How can customer assure product’s quality?
1) We can send customer some sample for lab testing before placing an order.
2) We can supply the third party authentication according to our customers' requirement, such as free CIQ Inspection or charged SGS Inspection.
3) If customer’s credit has passed our Financial Department’s examine and verify, we can accept payment after cargo’s deliver or even 30-60 days Open Account from B/L date.