阅读说明：本技术 一种锌湿法炼锌净化工序中抑制钴镉复溶的工艺 (Process for inhibiting cobalt and cadmium redissolution in zinc hydrometallurgy purification process ) 是由 段小维 马菲菲 段宏志 冶玉花 于 2019-08-23 设计创作，主要内容包括：本发明涉及湿法炼锌冶炼技术领域,是一种锌湿法炼锌净化工序中抑制钴镉复溶的工艺,步骤1控制一次净化压滤后液含镉＜100mg/L,流量135-155m<Sup>3</Sup>/h；步骤2控制二次净化1#槽含钴6-10mg/L；步骤3控制二次净化1#、2#、3#槽反应温度86-90℃；步骤4配置浓度为65-75g/L的吐酒石溶液,将吐酒石溶液加入二次净化溜槽中,再以均匀的流量、均匀的浓度加入二次净化1#槽,吐酒石加入量为2.5-3.5Kg/d；步骤5用加热器回水将硫酸铅在4m<Sup>3</Sup>的浆化槽里浆化,浆化后以蠕动泵的方式加入二次净化1#槽内,硫酸铅加入量10~15g/m<Sup>3</Sup>；步骤6压滤机卸渣频次为1-1.5小时/次。有益效果：有效的抑制了净化滤液钴、镉杂质复溶,减少了返液次数,提高了产量,降低了锌粉的消耗。(The invention relates to the technical field of zinc hydrometallurgy smelting, in particular to a process for inhibiting cobalt and cadmium redissolution in a zinc hydrometallurgy purification process, which comprises the step 1 of controlling the cadmium content of a solution after primary purification and filter pressing to be less than 100mg/L and the flow rate of 135-155 m- 3 H; step 2, controlling the cobalt content of the No. 1 secondary purification tank to be 6-10 mg/L; step 3, controlling the reaction temperature of the tanks 1#, 2#, 3# for secondary purification to be 86-90 ℃; step 4, preparing a 65-75g/L tartaric acid solution, adding the tartaric acid solution into a secondary purification chute, and then adding the tartaric acid solution into a secondary purification 1# groove at a uniform flow rate and a uniform concentration, wherein the adding amount of the tartaric acid solution is 2.5-3.5 Kg/d; step 5, returning water by a heater to lead sulfate at 4m 3 The slurrying is carried out in a slurrying tank, the slurried slurry is added into a No. 1 tank for secondary purification in a peristaltic pump mode, and the adding amount of lead sulfate is 10 ~ 15g/m 3 (ii) a And 6, the slag discharging frequency of the filter press is 1-1.5 hours per time. Has the advantages that: effectively inhibits the re-dissolution of cobalt and cadmium impurities in the purified filtrate, reduces the liquid return times, and improvesHigh output and low consumption of zinc powder.)

1. A process for inhibiting cobalt and cadmium redissolution in a zinc hydrometallurgy purification process is characterized by comprising the following steps: step 1, controlling the cadmium content of the liquid after primary purification and filter pressing to be less than 100mg/L and the flow rate to be 135-³/h；

Step 2, controlling the cobalt content of the No. 1 secondary purification tank to be 6-10 mg/L;

step 3, controlling the reaction temperature of the tanks 1#, 2#, 3# for secondary purification to be 86-90 ℃;

step 4, preparing a 65-75g/L tartaric acid solution, adding the tartaric acid solution into a secondary purification chute, and adding the tartaric acid solution into a secondary purification 1# groove through the secondary purification chute at a uniform flow rate and a uniform concentration, wherein the adding amount of the tartaric acid solution is 2.5-3.5 Kg/d;

step 5, returning water by a heater to lead sulfate at 4m³The slurrying is carried out in a slurrying tank, the slurried lead sulfate is added into a No. 1 tank for secondary purification in a peristaltic pump mode, and the adding amount of the slurried lead sulfate is 10 ~ 15g/m³；

And 6, adjusting the slag discharging frequency of the filter press from 2.5 to 3 hours/time to 1 to 1.5 hours/time.

Technical Field

The invention relates to the technical field of zinc hydrometallurgy and smelting, in particular to a process for inhibiting cobalt and cadmium redissolution in a zinc hydrometallurgy purification process.

Background

The zinc hydrometallurgy purification process mainly adopts a three-section zinc powder-reverse antimony purification process (the process flow is shown in figure 1), when the process is used for treating a zinc concentrate raw material containing high-cobalt and cadmium impurities, the secondary purification cobalt removal gradient and effect are poor, and the phenomenon of redissolving the impurities such as cobalt, cadmium and the like frequently occurs in a liquid after the secondary purification in a filter press.

When the re-dissolving probability of cobalt and cadmium in the liquid is obviously increased after secondary purification, the fluctuation of the quality of the clean liquid and the fresh liquid is large, the circulation adjustment times and the adjustment time of liquid return in the unqualified fresh liquid are long, the capacity of the fresh liquid is seriously influenced, and the cathode zinc is in an under-production state for a long time; in the liquid return circulation adjustment process, the consumption of the secondary purification alloy zinc powder is increased, and the unit production cost is increased.

Disclosure of Invention

The invention aims to solve the problems in the prior art and provides a process for inhibiting cobalt and cadmium redissolution in a zinc hydrometallurgy purification process.

The technical scheme adopted by the invention is as follows: a process for inhibiting cobalt and cadmium redissolution in a zinc hydrometallurgy purification process comprises the following steps: step 1, controlling the cadmium content of the liquid after primary purification and filter pressing to be less than 100mg/L and the flow rate to be 135-³/h；

Step 2, controlling the cobalt content of the No. 1 secondary purification tank to be 6-10 mg/L;

step 3, controlling the reaction temperature of the tanks 1#, 2#, 3# for secondary purification to be 86-90 ℃;

step 4, preparing a 65-75g/L tartaric acid solution, adding the tartaric acid solution into a secondary purification chute, adding the tartaric acid solution into a secondary purification 1# groove through the secondary purification chute at a uniform flow rate and a uniform concentration, wherein the daily addition amount of the tartaric acid solution is 2.5-3.5 Kg/d;

step 5, returning water by a heater to lead sulfate at 4m³The slurrying is carried out in a slurrying tank, the slurried lead sulfate is added into a No. 1 tank for secondary purification in a peristaltic pump mode, and the adding amount of the slurried lead sulfate is 10 ~ 15g/m³；

And 6, adjusting the slag discharging frequency of the filter press from 2.5 to 3 hours/time to 1 to 1.5 hours/time.

The principle of the invention is as follows: 1) lead sulfate is added into a secondary purification system in a slurrying mode, and as lead metal elements are preferentially replaced and form a micro-battery effect with zinc, the replacement reaction of zinc powder and impurity cadmium cobalt metal is accelerated; and secondly, uneven pits are formed on the surfaces of the lead metal particles, so that the re-dissolution of cobalt and cadmium can be effectively inhibited. Because lead is replaced out in preference to cobalt and cadmium, the lead does not remain in the liquid after secondary purification after filter pressing and enters the next procedure, and therefore the procedure operation after secondary purification is not influenced.

2) Production practice and production experiment data show that under the reaction conditions of adding alloy zinc powder and a small amount of antimonite and at the temperature of 86-90 ℃, a small amount of lead sulfate is added, so that a certain catalytic effect on the secondary purification cobalt-removing reaction is achieved, the system control is stable, and the occurrence of cobalt-cadmium redissolution is effectively restrained to a certain extent.

3) Aiming at the phenomenon that the secondary post-liquid is back-dissolved on the filter press, the frequency of unloading the slag of the filter press is strengthened, the back-dissolving time of the cobalt slag is reduced, the back-dissolving of the cobalt on the filter press is inhibited, and the quality of the purified new liquid is ensured.

The invention has the beneficial effects that: 1. the purification effect is improved, the cobalt removal effect of the system is better, the gradient is obvious, the fluctuation is small, and the primary qualified rate of the new liquid is improved.

2. Effectively inhibits the redissolution of cobalt and cadmium impurities in the purified filtrate, reduces the liquid returning times, improves the yield and reduces the consumption of zinc powder. Saving 300 tons of alloy zinc powder in the year, about 450 ten thousand yuan.

Drawings

FIG. 1 is a flow chart of a three-stage zinc powder-reverse antimony purification process in zinc hydrometallurgy.

Detailed Description