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CN-121992219-A - Tin hard head liquation refining process

CN121992219ACN 121992219 ACN121992219 ACN 121992219ACN-121992219-A

Abstract

The invention belongs to the technical field of metallurgical technology, and particularly relates to a tin hard head liquation refining process which comprises the steps of 1, adding solid tin hard heads into lead alloy liquid in batches, stirring, controlling the temperature of the lead alloy liquid to be 610-680 ℃ during stirring, stopping stirring after the tin hard heads are granular or powdery, taking out scum to obtain crude tin liquid, 2, condensing iron and arsenic, and 3, removing copper after the iron and the arsenic are qualified. The invention adopts the technology of high metal Wen Rongxi to separate out crude tin from the tin hard head, replaces the secondary furnace feeding technology of the broken tin slag in the traditional technology, and solves the problems of difficult melting, long period, low tin yield and the like in the traditional technology.

Inventors

  • ZHANG YINGJUN
  • FENG RUIKANG
  • Nie Zhanying
  • GUO XUEYAN
  • He Cailinrui
  • CHEN YANG

Assignees

  • 河南豫光金铅股份有限公司

Dates

Publication Date
20260508
Application Date
20251222

Claims (8)

  1. 1. A tin hard head liquation refining process, which is characterized by comprising the following steps: Step 1, adding solid tin hard heads into lead alloy liquid in batches, stirring, controlling the temperature of the lead alloy liquid to be 610-680 ℃ during the stirring, stopping stirring after the tin hard heads are granular or powdery, and fishing out scum to obtain crude tin liquid; Step 2, condensing to remove iron and arsenic; and 3, removing copper after removing iron and arsenic are qualified.
  2. 2. The tin hard head liquation refining process according to claim 1, wherein in step 1, the temperature of the lead alloy liquid is controlled to be 650-680 ℃.
  3. 3. The process for refining tin hard head melting as recited in claim 1, wherein the crude tin solution contains more than 20% tin before the step 2 is performed with iron and arsenic removal by condensation.
  4. 4. The tin hard head liquation refining process according to claim 1, wherein in the step 2, the operation of removing iron and arsenic by condensation is carried out by controlling the temperature of crude tin liquor to 280-300 ℃, stirring, adding a slag former, forming scum, stirring until the reaction is finished, wherein Fe in the obtained crude tin liquor is less than or equal to 0.2%, as is less than or equal to 0.5%, and completing the condensation operation.
  5. 5. The tin hard head liquation refining process according to claim 4, wherein the slag former in step 2 is sawdust.
  6. 6. The tin hard head liquation refining process according to claim 1, wherein in the step 3, the copper removal operation is that the crude tin liquid is heated to 250 ℃, and slag forming agent is added after stirring, so that scum is formed, and the stirring is carried out until the reaction is finished.
  7. 7. The tin hard head liquation refining process according to claim 6, wherein the slag former in the step 3 is sulfur, and the mass ratio of the sulfur to the copper is 0.5:1.
  8. 8. The tin hard head liquation refining process according to claim 6, wherein in the step 3, when slag is formed, stirring crude tin liquid forms vortex, adding sulfur into the vortex, stirring continuously after the sulfur is added, wherein the scum on the surface of the crude tin liquid is gradually changed into black powder from yellow gray thick matters, and Cu is less than or equal to 0.1 percent, and the reaction is regarded as ending.

Description

Tin hard head liquation refining process Technical Field The invention belongs to the technical field of metallurgical technology, and particularly relates to a tin hard head liquation refining technology. Background In the molten tin slag smelting process, iron element enters crude tin in liquid state, and a large amount of tin hard heads are produced through melting and liquation in the refining copper removal process, wherein the tin hard heads generally contain more than 45% of tin and a small amount of impurity elements. The prior art for treating tin hard heads generally adopts a secondary smelting process (Liu. Segregated tin slag is matched with lead oxide ore to carry out blast furnace smelting [ J ]. Chinese nonferrous metallurgy, 1997 (4): 10-13.) after crushing, and part of the tin hard heads are oxidized and enter a dust collecting device after being fed into the furnace, and part of the tin hard heads enter crude tin for the second time, so that the whole process has the problems of long period, low tin direct yield and the like. Disclosure of Invention The invention provides a tin hard head liquation refining process, which aims to solve the problems of long tin hard head smelting process period and low tin direct yield in the prior art. The process is simple and convenient to operate, is green and efficient, can rapidly separate out crude tin in the tin hard head, refine and remove impurities, shortens the smelting time of the tin hard head, and can improve the yield of tin. To achieve the above object, the present invention is achieved by: A tin hard head liquation refining process comprises the following steps: Step 1, adding solid tin hard heads into lead alloy liquid in batches, stirring, controlling the temperature of the lead alloy liquid to be 610-680 ℃ during the stirring, stopping stirring after the tin hard heads are granular or powdery, and fishing out scum to obtain crude tin liquid; In the step, the solid tin hard head can be added into the lead alloy liquid in 8-10 batches, the weight ratio of the solid tin hard head to the lead alloy can be 0.5-2, and the temperature of the lead alloy liquid is preferably 650-680 ℃. After the solid tin hard head is added into the lead alloy liquid, tin, lead and the like with low melting point in the tin hard head are dissolved into the liquid by stirring and dissolved, and iron, copper and the like with high melting point float on the surface to form scum. And 2, condensing to remove iron and arsenic. Before the condensation iron and arsenic removal, the tin content in the crude tin liquid is more than 20%. The operation of removing iron and arsenic by condensation is As follows, the temperature of the crude tin liquid is controlled to be 280-300 ℃, slag forming agent is added after stirring, scum is formed, and the stirring is carried out until the reaction is finished, at the moment, fe in the obtained crude tin liquid is less than or equal to 0.2 percent, as is less than or equal to 0.5 percent, and the condensation operation is completed. The slag former in the step can adopt sawdust, and the weight of the sawdust added into each 40t of crude tin liquor can be 10-20kg. In this step, the slag formation reaction is ended when the dross is no longer formed. And 3, removing copper after removing iron and arsenic are qualified. The copper removal operation is as follows, the crude tin liquid is heated to 250 ℃, stirred and added with slag former to form scum, and stirred until the reaction is finished. The slag former in the step selects sulfur, and the mass ratio of the sulfur to the copper is 0.5:1. When slagging, stirring the crude tin liquor to form vortex, adding sulfur into the vortex, and adding sulfur into the vortex can not be too rapid or too much, otherwise, the sulfur burns on the surface of the crude tin liquor, so that the utilization rate of the sulfur can be reduced, and the copper removal efficiency is affected. After the addition of the sulfur, stirring is continued, so that the sulfur fully reacts with copper in the crude tin liquor, the scum on the surface of the crude tin liquor is gradually changed into black powder from yellow gray sticky matters, cu is less than or equal to 0.1 percent, the reaction is finished, stirring is stopped, the scum is fished, and the tin hard head liquation refining is finished. The tin hard head liquation refining process principle of the invention is that solid tin hard head is added into molten lead alloy liquid, and the temperature of the lead alloy liquid is controlled, so that the tin hard head is stirred by a stirrer to be Wen Rongxi. At normal temperature, the tin hard head mainly exists in the form of tin-iron-arsenic alloy, after the tin hard head is heated, a liquid phase (tin liquid with iron content less than 10%) is separated, liquid phase tin is formed through liquation, partial tin with heavy tin hard head can be separated, the residual tin hard head solid phase is continuously