I believe the only way Africa can benefit from the Africa-China trade is if they is a lot of Africans with businesses in China.
This is how (history shows) other ethnics have progressed i.e. Jews in America formed their own businesses, even though they were discriminated against, hence today Jews are one of the/if not the richest ethnic group.
Forming businesses is key to doing well for a group in the country they immigrate to. It has nothing to do with trade relations with the country they immigrate from.
Cubans in Miami have done pretty well, in spite of a decades long anti-Cuba trade embargo.
Jews in Europe did well, long before a Jewish homeland was created-- The Jews in Antwerp had made mucho dinero trading in African diamonds (the African miners, not so much). Koreans in the USA have done well and it isn't due to imports of Korean alcohol for sale in liquor stores.
Do you think a Jew who was born in England and moved to Argentina is more interested in trade with the Levant than in trade with Europe? (I think he's more interested in trade with wherever yields the most profits).
IMHO the way for Africa to benefit from the trade with China is to demand that production facilities for whatever is being made from the raw materials currently being stripped from Africa, be located in Africa even if ownership is Chinese.
Exporting raw materials is a great way to make a few people rich. Exporting finished goods is a proven way to make a nation rich.