Process for improving utilization rate of high noble metal nickel concentrate

Abstract

The invention relates to the technical field of non-ferrous metal thermometallurgy, in particular to a process for improving the utilization rate of high-precious-metal nickel concentrate, and aims at solving the problem that the current high-precious-metal nickel concentrate treatment and utilization efficiency is low. According to the technology, high-precious-metal nickel concentrate is subjected to rotary kiln roasting, side-blown smelting furnace oxygen-enriched smelting and electric furnace settling separation to obtain precious metal nickel matte and furnace slag, the precious metal nickel matte is merged into a secondary alloy treatment technology to recover Ni, Cu, Pt, Pd and Au, and the furnace slag and the nickel concentrate are matched to enter a nickel smelting system; the method provided by the invention realizes a new treatment process for short-process and efficient recovery of noble metals in the high noble metal nickel concentrate, improves the recovery rates of Ni, Cu, Pt, Pd and Au in the noble metal nickel concentrate, and reduces the invalid cycle of system metals.

Description

Technical Field

[0001] The invention relates to the technical field of nonferrous metal pyrometallurgy, and in particular to a process for improving the utilization rate of noble metal nickel concentrate. Background Art

[0002] At present, the high-noble metal nickel concentrate is processed by entering the nickel smelting process with general nickel concentrate, and the precious metals mainly accompany the nickel concentrate throughout the smelting process until the primary alloy is separated after grinding and flotation of high matte and then enter the separate smelting process of precious metals. The main processing process of the precious metal accompanying nickel concentrate is to accompany the nickel concentrate for processing, and its process flow is: high-noble metal nickel concentrate → flash smelting → converter blowing → high nickel matte → slow cooling → grinding and flotation separation → secondary nickel concentrate + secondary copper concentrate + primary alloy → alloy sulfidation furnace → secondary alloy → precious metal system processing. The current processing technology is insufficient, mainly manifested in two aspects: First, the high-noble metal nickel concentrate enters the nickel smelting system after accompanying the nickel concentrate ingredients, resulting in a long process flow of precious metals (Pt, Pd, Au) and a low recovery rate. Second, the recovery of precious metals is based on the by-products of nickel smelting as the process route, with poor liquidity and relatively high energy consumption, and it is impossible to achieve efficient recovery of precious metals (Pt, Pd, Au). Summary of the invention

[0003] The present invention provides a process for improving the utilization rate of high-noble metal nickel concentrate to solve the problems existing in the above background.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions: A process for improving the utilization rate of high-noble metal nickel concentrate comprises the following steps: Step 1, rotary kiln roasting: the noble metal nickel concentrate is roasted in a rotary kiln, the residence time of the material in the kiln is controlled to be T≥3h, and the temperature of the material out of the kiln is controlled to be ≥700℃.

[0005] Step 2, oxygen-enriched blowing in a side-blown furnace: the material produced by the rotary kiln in step 1 is added with quartz stone with a flux rate of 20%-25%, the temperature is 1400℃-1480℃, and the oxygen consumption is 140 m3 / t-150m3 / t.

[0006] Step 3, electric furnace sedimentation separation: All the products after blowing in the side-blown furnace are put into the electric furnace for sedimentation separation, and 3%-5% of reducing agent is added to further release the valuable metals contained in the slag, and the precious metal nickel matte and slag are separated by sedimentation.

[0007] Step 4, product processing: The noble metal nickel matte enters the noble metal processing system and is incorporated into the noble metal secondary alloy processing process route. After quenching with water, the smelting slag enters the nickel system to further recover the valuable metals.

[0008] The present invention has the following beneficial effects: The present invention utilizes a rotary kiln to carry out oxidation roasting of noble nickel concentrate to obtain preliminarily desulfurized roasted sand, and further desulfurizes, oxidizes and slags the noble nickel concentrate roasted sand by side-blowing a strong oxidizing atmosphere to obtain a process of obtaining noble metal nickel matte and slag. The noble metal nickel matte and slag enter a sedimentation electric furnace for sedimentation separation, and a reducing agent is added to destroy the magnetic iron, so as to further sediment and separate the valuable metals into the noble metal nickel matte and slag.

[0009] The present invention utilizes a rotary kiln-side-blown smelting furnace-electric furnace process to obtain a precious metal nickel matte containing precious metals (Au+Pd+Pt) greater than 9000 g / t (Au+Pd+Pt enrichment ratio is 30 times that of the original ore). The obtained precious metal nickel matte can be directly incorporated into the existing secondary alloy precious metal processing process. In the entire process, the Au recovery rate is ≥97.6%, the Pd recovery rate is ≥96.5%, and the Pt recovery rate is ≥96.7%.

[0010] The present invention utilizes complex sulfide oxidation under high oxygen potential, a large amount of FeO and quartz stone slag formation, valuable metals such as Ni, Cu and precious metals Pt, Pd, Au enter nickel matte to obtain precious metal nickel matte, and a reducing agent is used in the electric furnace sedimentation separation process to reduce the content of magnetic iron in the slag, further reduce valuable metal mechanical inclusions, and improve the recovery rate of valuable metals, thereby efficiently realizing the processing process of high-precious metal nickel concentrate to precious metal nickel matte. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 The figure is a process flow chart of the treatment of noble metal nickel concentrate in the present invention. DETAILED DESCRIPTION

[0012] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0013] Example 1 A process for improving the utilization rate of high-noble metal nickel concentrate comprises the following steps: Step 1, rotary kiln roasting: The noble metal nickel concentrate is roasted in a rotary kiln, the residence time of the material in the kiln is controlled to be T3h, and the temperature of the material out of the kiln is controlled to be 700°C.

[0014] Step 2: Oxygen-enriched blowing in side-blown furnace: Add quartz stone to the material produced by the rotary kiln in step 1, with a flux rate of 20%, a temperature of 1400°C, and an oxygen consumption of 140 m 3 / t.

[0015] Step 3, electric furnace sedimentation separation: all the products after the side-blowing furnace blowing are put into the electric furnace for sedimentation separation, 3% of reducing agent is added, the sedimentation temperature is 1400℃, and the sedimentation time is 2h, so as to further release the valuable metals contained in the slag, and separate the precious metal nickel matte and slag by sedimentation.

[0016] Step 4, product processing: The noble metal nickel matte enters the noble metal processing system and is incorporated into the noble metal secondary alloy processing process route. After quenching with water, the smelting slag enters the nickel system to further recover the valuable metals.

[0017] Example 2 A process for improving the utilization rate of high-noble metal nickel concentrate comprises the following steps: Step 1, rotary kiln roasting: The noble metal nickel concentrate is roasted in a rotary kiln, the residence time of the material in the kiln is controlled to be T≥4h, and the temperature of the material out of the kiln is controlled to be 720°C.

[0018] Step 2: Oxygen-enriched blowing in side-blowing furnace: Add quartz stone to the material produced by the rotary kiln in step 1, with a flux rate of 23%, a temperature of 1450°C, and an oxygen consumption of 145m 3 / t.

[0019] Step 3, electric furnace sedimentation separation: all the products after blowing in the side-blown furnace are put into the electric furnace for sedimentation separation, 4% of reducing agent is added, the sedimentation temperature is 1460℃, and the sedimentation time is 3h, so as to further release the valuable metals contained in the slag, and separate the precious metal nickel matte and slag by sedimentation.

[0020] Step 4, product processing: The noble metal nickel matte enters the noble metal processing system and is incorporated into the noble metal secondary alloy processing process route. After quenching with water, the smelting slag enters the nickel system to further recover the valuable metals.

[0021] Example 3 A process for improving the utilization rate of high-noble metal nickel concentrate comprises the following steps: Step 1, rotary kiln roasting: The noble metal nickel concentrate is roasted in a rotary kiln, the residence time of the material in the kiln is controlled to be T=5h, and the temperature of the material out of the kiln is controlled to be 750°C. Table 1 shows the composition of the noble metal nickel concentrate, and Table 2 shows the composition of the noble metal roasted sand.

[0022] Table 1 Composition of noble metal nickel concentrate Table 2 Noble metal roasted sand composition Step 2: Oxygen-enriched blowing in side-blown furnace: Add quartz stone to the material produced by the rotary kiln in step 1, with a flux rate of 25%, a temperature of 1480°C, and an oxygen consumption of 150m3. 3 / t.

[0023] Step 3, electric furnace sedimentation separation: all the products after blowing in the side-blown furnace are put into the electric furnace for sedimentation separation, 5% of the reducing agent is added, the sedimentation temperature is 1480°C, and the sedimentation time is 4 hours, so as to further release the valuable metals mixed in the slag, and the precious metal nickel matte and slag are separated by sedimentation to obtain the precious metal nickel matte component and slag, whose main components are shown in Table 3 and Table 4 below.

[0024] Table 3 Composition of precious metal nickel matte Table 4 Composition of smelting slag Step 4, product processing: The noble metal nickel matte enters the noble metal processing system and is incorporated into the noble metal secondary alloy processing process route. After quenching with water, the smelting slag enters the nickel system to further recover the valuable metals.

Claims

1. A process for improving the utilization rate of noble metal nickel concentrate, characterized in that: The following steps are involved: Step 1, rotary kiln roasting: the noble metal nickel concentrate is roasted in a rotary kiln, the residence time of the material in the kiln is controlled to be T≥3h, and the temperature of the material out of the kiln is controlled to be ≥700℃; Step 2, oxygen-enriched blowing in a side-blown furnace: the material produced by the rotary kiln in step 1 is mixed with quartz stone with a flux rate of 20%-25%, a temperature of 1400°C-1480°C, and an oxygen consumption of 140 m3 / t-150 m3 / t; Step 3, electric furnace sedimentation separation: all the products after blowing in the side-blown furnace are put into the electric furnace for sedimentation separation, and 3%-5% of reducing agent is added to further release the valuable metals mixed in the slag, and the precious metal nickel matte and slag are separated by sedimentation; Step 4, product processing: The noble metal nickel matte enters the noble metal processing system and is incorporated into the noble metal secondary alloy processing process route. After quenching with water, the smelting slag enters the nickel system to further recover the valuable metals.

Images