Leaching solution and leaching process of zinc

Abstract

The invention relates to a leaching solution and a leaching process of zinc, and belongs to the technical field of zinc preparation methods. The leaching solution is characterized by comprising waterand the following raw materials by weight: 31.2-38.6 parts of ferric chloride, 49.8-58.7 parts of sodium chloride, 4.3-6.2 parts of yttrium chloride and 4.2-6.7 parts of hydrochloric acid. The leaching process comprises the following steps that zinc concentrate is crushed, then zinc leaching solution is added, and the solid-liquid ratio g : L of the zinc concentrate to the zinc leaching solution is 1~3 : 4~7; electrochemical reduction is carried out under the stirring condition, and meanwhile electrochemical reduction is carried out, the leaching temperature is 40 DEG C-50 DEG C, and the leaching time is 2.5 h-3 h; zinc powder accounting for 0.01% -1% of the mass of the zinc concentrate is added and filtered to obtain filtrate X1 and filter residue Y1; and the filtrate X1 is evaporated andcrystallized to obtain zinc chloride, and the evaporated steam is condensed and then returned to a zinc leaching solution for reuse. According to the leaching solution and the leaching process, the zinc in the ore can be fully leached. The used leaching solution can be recycled after the required zinc is separated.

Description

technical field [0001] A zinc leaching solution and a leaching process belong to the technical field of zinc preparation methods. Background technique [0002] Zinc concentrate is generally produced from zinc-zinc ore or zinc-containing ore through crushing, ball milling, foam flotation and other processes, which meet the national standard and have a high zinc content. Zinc can be alloyed with a variety of non-ferrous metals, the most important of which are brass composed of zinc and copper, tin, zinc, etc., and can also be used to form die-cast alloys with aluminum, magnesium, copper, etc. Zinc is mainly used in iron and steel, metallurgy, machinery, electrical, chemical industry, light industry, military and medicine and other fields. At present, the preparation methods of zinc mainly include the following: 1) calcining sphalerite or sphalerite in the air into zinc oxide, and then reducing it with carbon to obtain it, but the purity of the zinc obtained is low; 2) making ...

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Problems solved by technology

At present, the preparation methods of zinc mainly include the following: 1) calcining sphalerite or sphalerite in the air into zinc oxide, and then reducing it with carbon to obtain it, but the purity of the zinc obtained is low; 2) making zinc oxide Mixed with coke, heated in a blast furnace to 1373K~1573K, the zinc is distilled out, and the purity is about 98%; but the energy consumption is too high, 3) After leaching into zinc sulfate with sulfuric acid, the zinc is dissolved into zinc sulfate by controlling the pH Impurities such as iron, arsenic and antimony are hydrolyzed and transformed into precipitates into the leaching slag, zinc powder is added to remove impurities such as copper and cadmium in the filtrate, and zinc is deposited by electrolysis. The zinc produced has a high purity (about 99.99%), but In this method, the extraction rate of zinc is not high enough, and the preparation efficiency is also low