Crude indium and active zinc oxide co-production process

Abstract

The coproduction technique for coarse indium and active ZnO comprises: (1) curing In-contained hypo-ZnO or material contained both Zn and In; (2) leaching out with mother liquor; (3) filter pressing; (4) neutralizing; (5) filter pressing; (51) extracting neutralized slag; (52) cuing; (53) leaching out; (54) filter pressing; (55) displacing and reducing with Zinc concentrate; (56) filter pressing; (57) extracting; (58) back extracting; (59) displacing; (60) agglomerating; (61) fusing and casting; then, obtaining the coarse IN element; meanwhile, (4) neutralizing; (5) filter pressing; (6) removing Fe and Mn elements with KMnO4; (64) mixing reffinate; (7) filter pressing; (8) displacing with Zn powder; (9) filter pressing; (10) refining with KMnO4; (11) depositing with NH4HCO3; (12) cleaning, filter pressing; (13) drying and baking; (14) obtaining the active ZnO. Compared with the independent prior art, this invention produces little pollution, has small loss to valuable metal, makes full use to the source with low request, and needs low cost and investment.

Description

technical field [0001] The invention relates to a new process for producing crude indium and active zinc oxide by using indium-containing secondary zinc oxide or other zinc-containing and indium-containing materials as raw materials. Background technique [0002] Indium belongs to scattered metals, and its amount in the earth's crust is very small, about 1×10 by mass percentage -5 %, it exists in various metal ore bodies in a dispersed state, and no single indium deposit has been found in the world so far; [0003] Indium is most often associated with pot zinc ore. At present, the raw material for crude indium production is mainly lead-zinc roasting smoke; therefore, the separation of lead, zinc and indium is the main process of crude indium production; lead is insoluble in sulfuric acid and remains in the slag after leaching. Among them, the separation of it and indium is relatively simple; while zinc and indium are easily soluble in sulfuric acid, their separation is more...

AI Technical Summary

Problems solved by technology

[0007] 1. Great environmental pollution: two independent systems have two independent wastewater discharges, which is twice the environmental pollution; especially the raffinate produced by crude tobacco, because the process requires excessive sulfuric acid, which not only has a lot of A heavy non-ferrous metal, and there is an excessive amount of acid; some manufacturers discharge directly, and the pollution to the water body can be imagined; although some manufacturers discharge after simple neutralization, they are far from "qualified discharge" standards, which likewise pollute the environment;

[0008] 2. Serious loss of valuable metals: two independent systems also cause serious loss of two valuable metals; because both zinc and indium are soluble in sulfuric acid, they both exist in the liquid phase after leaching, and both systems Only one of the metals is taken, while the other metal is discharged with the waste liquid in vain, causing serious waste; it is estimated that for every kilogram of crude indium produced, the loss of zinc metal is about 100 to 300 kilograms; For every ton of active zinc oxide produced, the loss of indium metal is about 50 to 150 grams; and the metal discharged with wastewater is also one of the metals that pollute the environment;

[0009] 3. High requirements for raw materials: due to the loss of valuable metals, the raw materials selected in production are limited to the range of "high metal content and low metal content", so as to reduce the loss; it is precisely because of this It narrows the scope of application of the manufacturer's raw materials; in other words, it limits the development of the manufacturer; limited resources are not fully utilized;

[0010] 4. Large investment and high cost: To build two mutually independent production systems, the fixed investment must be relatively high because there is no common equipment; and the production cost composition of the two mutually independent production systems is correspondingly high ; For example, in the production of crude indium, the process requires excess sulfuric acid, that is to say, the excess cost is invested to meet the process requirements; and this part of excess sulfuric acid must be passively neutralized with lime in the process of wastewater treatment, which increases A high production cost; there are still many such contradictions in traditional crafts

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